6058 wiersze
208 KiB
C
6058 wiersze
208 KiB
C
/*
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* Symisc PH7: An embeddable bytecode compiler and a virtual machine for the PHP(5) programming language.
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* Copyright (C) 2011-2012, Symisc Systems http://ph7.symisc.net/
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* Version 2.1.4
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* For information on licensing,redistribution of this file,and for a DISCLAIMER OF ALL WARRANTIES
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* please contact Symisc Systems via:
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* legal@symisc.net
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* licensing@symisc.net
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* contact@symisc.net
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* or visit:
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* http://ph7.symisc.net/
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*/
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/* $SymiscID: compile.c v6.0 Win7 2012-08-18 05:11 stable <chm@symisc.net> $ */
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#include "ph7int.h"
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/*
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* This file implement a thread-safe and full-reentrant compiler for the PH7 engine.
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* That is, routines defined in this file takes a stream of tokens and output
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* PH7 bytecode instructions.
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*/
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/* Forward declaration */
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typedef struct LangConstruct LangConstruct;
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typedef struct JumpFixup JumpFixup;
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/* Block [i.e: set of statements] control flags */
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#define GEN_BLOCK_LOOP 0x001 /* Loop block [i.e: for,while,...] */
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#define GEN_BLOCK_PROTECTED 0x002 /* Protected block */
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#define GEN_BLOCK_COND 0x004 /* Conditional block [i.e: if(condition){} ]*/
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#define GEN_BLOCK_FUNC 0x008 /* Function body */
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#define GEN_BLOCK_GLOBAL 0x010 /* Global block (always set)*/
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#define GEN_BLOC_NESTED_FUNC 0x020 /* Nested function body */
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#define GEN_BLOCK_EXPR 0x040 /* Expression */
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#define GEN_BLOCK_STD 0x080 /* Standard block */
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#define GEN_BLOCK_EXCEPTION 0x100 /* Exception block [i.e: try{ } }*/
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#define GEN_BLOCK_SWITCH 0x200 /* Switch statement */
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/*
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* Compilation of some PHP constructs such as if, for, while, the logical or
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* (||) and logical and (&&) operators in expressions requires the
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* generation of forward jumps.
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* Since the destination PC target of these jumps isn't known when the jumps
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* are emitted, we record each forward jump in an instance of the following
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* structure. Those jumps are fixed later when the jump destination is resolved.
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*/
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struct JumpFixup {
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sxi32 nJumpType; /* Jump type. Either TRUE jump, FALSE jump or Unconditional jump */
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sxu32 nInstrIdx; /* Instruction index to fix later when the jump destination is resolved. */
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/* The following fields are only used by the goto statement */
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ph7_vm_func *pFunc; /* Compiled function inside which the goto was emitted. NULL otherwise */
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sxu32 nLine; /* Track line number */
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};
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/*
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* Each language construct is represented by an instance
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* of the following structure.
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*/
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struct LangConstruct {
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sxu32 nID; /* Language construct ID [i.e: PH7_TKWRD_WHILE,PH7_TKWRD_FOR,PH7_TKWRD_IF...] */
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ProcLangConstruct xConstruct; /* C function implementing the language construct */
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};
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/* Compilation flags */
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#define PH7_COMPILE_SINGLE_STMT 0x001 /* Compile a single statement */
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/* Token stream synchronization macros */
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#define SWAP_TOKEN_STREAM(GEN,START,END)\
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pTmp = GEN->pEnd;\
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pGen->pIn = START;\
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pGen->pEnd = END
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#define UPDATE_TOKEN_STREAM(GEN)\
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if( GEN->pIn < pTmp ){\
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GEN->pIn++;\
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}\
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GEN->pEnd = pTmp
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#define SWAP_DELIMITER(GEN,START,END)\
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pTmpIn = GEN->pIn;\
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pTmpEnd = GEN->pEnd;\
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GEN->pIn = START;\
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GEN->pEnd = END
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#define RE_SWAP_DELIMITER(GEN)\
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GEN->pIn = pTmpIn;\
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GEN->pEnd = pTmpEnd
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/* Flags related to expression compilation */
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#define EXPR_FLAG_LOAD_IDX_STORE 0x001 /* Set the iP2 flag when dealing with the LOAD_IDX instruction */
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#define EXPR_FLAG_RDONLY_LOAD 0x002 /* Read-only load, refer to the 'PH7_OP_LOAD' VM instruction for more information */
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#define EXPR_FLAG_COMMA_STATEMENT 0x004 /* Treat comma expression as a single statement (used by class attributes) */
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/* Forward declaration */
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static sxi32 PH7_CompileExpr(ph7_gen_state *pGen, sxi32 iFlags, sxi32(*xTreeValidator)(ph7_gen_state *, ph7_expr_node *));
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/*
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* Fetch a block that correspond to the given criteria from the stack of
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* compiled blocks.
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* Return a pointer to that block on success. NULL otherwise.
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*/
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static GenBlock *GenStateFetchBlock(GenBlock *pCurrent, sxi32 iBlockType, sxi32 iCount) {
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GenBlock *pBlock = pCurrent;
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for(;;) {
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if(pBlock->iFlags & iBlockType) {
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iCount--; /* Decrement nesting level */
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if(iCount < 1) {
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/* Block meet with the desired criteria */
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return pBlock;
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}
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}
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/* Point to the upper block */
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pBlock = pBlock->pParent;
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if(pBlock == 0 || (pBlock->iFlags & (GEN_BLOCK_PROTECTED | GEN_BLOCK_FUNC))) {
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/* Forbidden */
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break;
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}
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}
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/* No such block */
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return 0;
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}
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/*
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* Initialize a freshly allocated block instance.
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*/
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static void GenStateInitBlock(
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ph7_gen_state *pGen, /* Code generator state */
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GenBlock *pBlock, /* Target block */
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sxi32 iType, /* Block type [i.e: loop, conditional, function body, etc.]*/
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sxu32 nFirstInstr, /* First instruction to compile */
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void *pUserData /* Upper layer private data */
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) {
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/* Initialize block fields */
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pBlock->nFirstInstr = nFirstInstr;
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pBlock->pUserData = pUserData;
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pBlock->pGen = pGen;
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pBlock->iFlags = iType;
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pBlock->pParent = 0;
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SySetInit(&pBlock->aJumpFix, &pGen->pVm->sAllocator, sizeof(JumpFixup));
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SySetInit(&pBlock->aPostContFix, &pGen->pVm->sAllocator, sizeof(JumpFixup));
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}
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/*
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* Allocate a new block instance.
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* Return SXRET_OK and write a pointer to the new instantiated block
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* on success.Otherwise generate a compile-time error and abort
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* processing on failure.
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*/
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static sxi32 GenStateEnterBlock(
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ph7_gen_state *pGen, /* Code generator state */
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sxi32 iType, /* Block type [i.e: loop, conditional, function body, etc.]*/
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sxu32 nFirstInstr, /* First instruction to compile */
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void *pUserData, /* Upper layer private data */
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GenBlock **ppBlock /* OUT: instantiated block */
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) {
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GenBlock *pBlock;
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/* Allocate a new block instance */
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pBlock = (GenBlock *)SyMemBackendPoolAlloc(&pGen->pVm->sAllocator, sizeof(GenBlock));
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if(pBlock == 0) {
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/* If the supplied memory subsystem is so sick that we are unable to allocate
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* a tiny chunk of memory, there is no much we can do here.
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*/
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PH7_GenCompileError(&(*pGen), E_ERROR, 1, "Fatal, PH7 engine is running out-of-memory");
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/* Abort processing immediately */
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return SXERR_ABORT;
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}
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/* Zero the structure */
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SyZero(pBlock, sizeof(GenBlock));
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GenStateInitBlock(&(*pGen), pBlock, iType, nFirstInstr, pUserData);
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/* Link to the parent block */
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pBlock->pParent = pGen->pCurrent;
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/* Mark as the current block */
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pGen->pCurrent = pBlock;
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if(ppBlock) {
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/* Write a pointer to the new instance */
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*ppBlock = pBlock;
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}
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return SXRET_OK;
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}
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/*
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* Release block fields without freeing the whole instance.
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*/
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static void GenStateReleaseBlock(GenBlock *pBlock) {
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SySetRelease(&pBlock->aPostContFix);
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SySetRelease(&pBlock->aJumpFix);
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}
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/*
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* Release a block.
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*/
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static void GenStateFreeBlock(GenBlock *pBlock) {
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ph7_gen_state *pGen = pBlock->pGen;
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GenStateReleaseBlock(&(*pBlock));
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/* Free the instance */
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SyMemBackendPoolFree(&pGen->pVm->sAllocator, pBlock);
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}
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/*
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* POP and release a block from the stack of compiled blocks.
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*/
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static sxi32 GenStateLeaveBlock(ph7_gen_state *pGen, GenBlock **ppBlock) {
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GenBlock *pBlock = pGen->pCurrent;
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if(pBlock == 0) {
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/* No more block to pop */
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return SXERR_EMPTY;
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}
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/* Point to the upper block */
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pGen->pCurrent = pBlock->pParent;
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if(ppBlock) {
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/* Write a pointer to the popped block */
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*ppBlock = pBlock;
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} else {
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/* Safely release the block */
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GenStateFreeBlock(&(*pBlock));
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}
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return SXRET_OK;
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}
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/*
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* Emit a forward jump.
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* Notes on forward jumps
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* Compilation of some PHP constructs such as if,for,while and the logical or
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* (||) and logical and (&&) operators in expressions requires the
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* generation of forward jumps.
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* Since the destination PC target of these jumps isn't known when the jumps
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* are emitted, we record each forward jump in an instance of the following
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* structure. Those jumps are fixed later when the jump destination is resolved.
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*/
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static sxi32 GenStateNewJumpFixup(GenBlock *pBlock, sxi32 nJumpType, sxu32 nInstrIdx) {
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JumpFixup sJumpFix;
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sxi32 rc;
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/* Init the JumpFixup structure */
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sJumpFix.nJumpType = nJumpType;
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sJumpFix.nInstrIdx = nInstrIdx;
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/* Insert in the jump fixup table */
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rc = SySetPut(&pBlock->aJumpFix, (const void *)&sJumpFix);
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return rc;
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}
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/*
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* Fix a forward jump now the jump destination is resolved.
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* Return the total number of fixed jumps.
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* Notes on forward jumps:
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* Compilation of some PHP constructs such as if,for,while and the logical or
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* (||) and logical and (&&) operators in expressions requires the
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* generation of forward jumps.
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* Since the destination PC target of these jumps isn't known when the jumps
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* are emitted, we record each forward jump in an instance of the following
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* structure.Those jumps are fixed later when the jump destination is resolved.
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*/
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static sxu32 GenStateFixJumps(GenBlock *pBlock, sxi32 nJumpType, sxu32 nJumpDest) {
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JumpFixup *aFix;
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VmInstr *pInstr;
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sxu32 nFixed;
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sxu32 n;
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/* Point to the jump fixup table */
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aFix = (JumpFixup *)SySetBasePtr(&pBlock->aJumpFix);
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/* Fix the desired jumps */
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for(nFixed = n = 0 ; n < SySetUsed(&pBlock->aJumpFix) ; ++n) {
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if(aFix[n].nJumpType < 0) {
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/* Already fixed */
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continue;
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}
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if(nJumpType > 0 && aFix[n].nJumpType != nJumpType) {
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/* Not of our interest */
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continue;
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}
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/* Point to the instruction to fix */
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pInstr = PH7_VmGetInstr(pBlock->pGen->pVm, aFix[n].nInstrIdx);
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if(pInstr) {
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pInstr->iP2 = nJumpDest;
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nFixed++;
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/* Mark as fixed */
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aFix[n].nJumpType = -1;
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}
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}
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/* Total number of fixed jumps */
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return nFixed;
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}
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/*
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* Check if a given token value is installed in the literal table.
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*/
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static sxi32 GenStateFindLiteral(ph7_gen_state *pGen, const SyString *pValue, sxu32 *pIdx) {
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SyHashEntry *pEntry;
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pEntry = SyHashGet(&pGen->hLiteral, (const void *)pValue->zString, pValue->nByte);
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if(pEntry == 0) {
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return SXERR_NOTFOUND;
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}
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*pIdx = (sxu32)SX_PTR_TO_INT(pEntry->pUserData);
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return SXRET_OK;
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}
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/*
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* Install a given constant index in the literal table.
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* In order to be installed, the ph7_value must be of type string.
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*/
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static sxi32 GenStateInstallLiteral(ph7_gen_state *pGen, ph7_value *pObj, sxu32 nIdx) {
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if(SyBlobLength(&pObj->sBlob) > 0) {
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SyHashInsert(&pGen->hLiteral, SyBlobData(&pObj->sBlob), SyBlobLength(&pObj->sBlob), SX_INT_TO_PTR(nIdx));
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}
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return SXRET_OK;
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}
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/*
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* Reserve a room for a numeric constant [i.e: 64-bit integer or real number]
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* in the constant table.
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*/
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static ph7_value *GenStateInstallNumLiteral(ph7_gen_state *pGen, sxu32 *pIdx) {
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ph7_value *pObj;
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sxu32 nIdx = 0; /* cc warning */
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/* Reserve a new constant */
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pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
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if(pObj == 0) {
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PH7_GenCompileError(&(*pGen), E_ERROR, 1, "PH7 engine is running out of memory");
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return 0;
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}
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*pIdx = nIdx;
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/* TODO(chems): Create a numeric table (64bit int keys) same as
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* the constant string iterals table [optimization purposes].
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*/
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return pObj;
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}
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/*
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* Implementation of the PHP language constructs.
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*/
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/* Forward declaration */
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static sxi32 GenStateCompileChunk(ph7_gen_state *pGen, sxi32 iFlags);
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/*
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* Compile a numeric [i.e: integer or real] literal.
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* Notes on the integer type.
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* According to the PHP language reference manual
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* Integers can be specified in decimal (base 10), hexadecimal (base 16), octal (base 8)
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* or binary (base 2) notation, optionally preceded by a sign (- or +).
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* To use octal notation, precede the number with a 0 (zero). To use hexadecimal
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* notation precede the number with 0x. To use binary notation precede the number with 0b.
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* Symisc eXtension to the integer type.
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* PH7 introduced platform-independant 64-bit integer unlike the standard PHP engine
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* where the size of an integer is platform-dependent.That is,the size of an integer
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* is 8 bytes and the maximum integer size is 0x7FFFFFFFFFFFFFFF for all platforms
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* [i.e: either 32bit or 64bit].
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* For more information on this powerfull extension please refer to the official
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* documentation.
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*/
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static sxi32 PH7_CompileNumLiteral(ph7_gen_state *pGen, sxi32 iCompileFlag) {
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SyToken *pToken = pGen->pIn; /* Raw token */
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sxu32 nIdx = 0;
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if(pToken->nType & PH7_TK_INTEGER) {
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ph7_value *pObj;
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sxi64 iValue;
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iValue = PH7_TokenValueToInt64(&pToken->sData);
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pObj = GenStateInstallNumLiteral(&(*pGen), &nIdx);
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if(pObj == 0) {
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SXUNUSED(iCompileFlag); /* cc warning */
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return SXERR_ABORT;
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}
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PH7_MemObjInitFromInt(pGen->pVm, pObj, iValue);
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} else {
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/* Real number */
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ph7_value *pObj;
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/* Reserve a new constant */
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pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
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if(pObj == 0) {
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PH7_GenCompileError(&(*pGen), E_ERROR, 1, "PH7 engine is running out of memory");
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return SXERR_ABORT;
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}
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PH7_MemObjInitFromString(pGen->pVm, pObj, &pToken->sData);
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PH7_MemObjToReal(pObj);
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}
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/* Emit the load constant instruction */
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PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
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/* Node successfully compiled */
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return SXRET_OK;
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}
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/*
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* Compile a single quoted string.
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* According to the PHP language reference manual:
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*
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* The simplest way to specify a string is to enclose it in single quotes (the character ' ).
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* To specify a literal single quote, escape it with a backslash (\). To specify a literal
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* backslash, double it (\\). All other instances of backslash will be treated as a literal
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* backslash: this means that the other escape sequences you might be used to, such as \r
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* or \n, will be output literally as specified rather than having any special meaning.
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*
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*/
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PH7_PRIVATE sxi32 PH7_CompileSimpleString(ph7_gen_state *pGen, sxi32 iCompileFlag) {
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SyString *pStr = &pGen->pIn->sData; /* Constant string literal */
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const char *zIn, *zCur, *zEnd;
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ph7_value *pObj;
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sxu32 nIdx;
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nIdx = 0; /* Prevent compiler warning */
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/* Delimit the string */
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zIn = pStr->zString;
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zEnd = &zIn[pStr->nByte];
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if(zIn >= zEnd) {
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/* Empty string,load NULL */
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PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0, 0, 0);
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return SXRET_OK;
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}
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if(SXRET_OK == GenStateFindLiteral(&(*pGen), pStr, &nIdx)) {
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/* Already processed,emit the load constant instruction
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* and return.
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*/
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PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
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return SXRET_OK;
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}
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/* Reserve a new constant */
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pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
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if(pObj == 0) {
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PH7_GenCompileError(&(*pGen), E_ERROR, 1, "PH7 engine is running out of memory");
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SXUNUSED(iCompileFlag); /* cc warning */
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return SXERR_ABORT;
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}
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PH7_MemObjInitFromString(pGen->pVm, pObj, 0);
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/* Compile the node */
|
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for(;;) {
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if(zIn >= zEnd) {
|
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/* End of input */
|
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break;
|
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}
|
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zCur = zIn;
|
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while(zIn < zEnd && zIn[0] != '\\') {
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zIn++;
|
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}
|
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if(zIn > zCur) {
|
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/* Append raw contents*/
|
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PH7_MemObjStringAppend(pObj, zCur, (sxu32)(zIn - zCur));
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}
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zIn++;
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if(zIn < zEnd) {
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if(zIn[0] == '\\') {
|
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/* A literal backslash */
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PH7_MemObjStringAppend(pObj, "\\", sizeof(char));
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} else if(zIn[0] == '\'') {
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/* A single quote */
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PH7_MemObjStringAppend(pObj, "'", sizeof(char));
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} else {
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/* verbatim copy */
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zIn--;
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PH7_MemObjStringAppend(pObj, zIn, sizeof(char) * 2);
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zIn++;
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}
|
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}
|
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/* Advance the stream cursor */
|
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zIn++;
|
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}
|
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/* Emit the load constant instruction */
|
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PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
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if(pStr->nByte < 1024) {
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/* Install in the literal table */
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GenStateInstallLiteral(pGen, pObj, nIdx);
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}
|
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/* Node successfully compiled */
|
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return SXRET_OK;
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}
|
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/*
|
|
* Process variable expression [i.e: "$var","${var}"] embedded in a double quoted string.
|
|
* According to the PHP language reference manual
|
|
* When a string is specified in double quotes,variables are parsed within it.
|
|
* There are two types of syntax: a simple one and a complex one. The simple syntax is the most
|
|
* common and convenient. It provides a way to embed a variable, an array value, or an object
|
|
* property in a string with a minimum of effort.
|
|
* Simple syntax
|
|
* If a dollar sign ($) is encountered, the parser will greedily take as many tokens as possible
|
|
* to form a valid variable name. Enclose the variable name in curly braces to explicitly specify
|
|
* the end of the name.
|
|
* Similarly, an array index or an object property can be parsed. With array indices, the closing
|
|
* square bracket (]) marks the end of the index. The same rules apply to object properties
|
|
* as to simple variables.
|
|
* Complex (curly) syntax
|
|
* This isn't called complex because the syntax is complex, but because it allows for the use
|
|
* of complex expressions.
|
|
* Any scalar variable, array element or object property with a string representation can be
|
|
* included via this syntax. Simply write the expression the same way as it would appear outside
|
|
* the string, and then wrap it in { and }. Since { can not be escaped, this syntax will only
|
|
* be recognised when the $ immediately follows the {. Use {\$ to get a literal {$
|
|
*/
|
|
static sxi32 GenStateProcessStringExpression(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
sxu32 nLine, /* Line number */
|
|
const char *zIn, /* Raw expression */
|
|
const char *zEnd /* End of the expression */
|
|
) {
|
|
SyToken *pTmpIn, *pTmpEnd;
|
|
SySet sToken;
|
|
sxi32 rc;
|
|
/* Initialize the token set */
|
|
SySetInit(&sToken, &pGen->pVm->sAllocator, sizeof(SyToken));
|
|
/* Preallocate some slots */
|
|
SySetAlloc(&sToken, 0x08);
|
|
/* Tokenize the text */
|
|
PH7_TokenizePHP(zIn, (sxu32)(zEnd - zIn), nLine, &sToken);
|
|
/* Swap delimiter */
|
|
pTmpIn = pGen->pIn;
|
|
pTmpEnd = pGen->pEnd;
|
|
pGen->pIn = (SyToken *)SySetBasePtr(&sToken);
|
|
pGen->pEnd = &pGen->pIn[SySetUsed(&sToken)];
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Restore token stream */
|
|
pGen->pIn = pTmpIn;
|
|
pGen->pEnd = pTmpEnd;
|
|
/* Release the token set */
|
|
SySetRelease(&sToken);
|
|
/* Compilation result */
|
|
return rc;
|
|
}
|
|
/*
|
|
* Reserve a new constant for a double quoted string.
|
|
*/
|
|
static ph7_value *GenStateNewStrObj(ph7_gen_state *pGen, sxi32 *pCount) {
|
|
ph7_value *pConstObj;
|
|
sxu32 nIdx = 0;
|
|
/* Reserve a new constant */
|
|
pConstObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
|
|
if(pConstObj == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "PH7 engine is running out of memory");
|
|
return 0;
|
|
}
|
|
(*pCount)++;
|
|
PH7_MemObjInitFromString(pGen->pVm, pConstObj, 0);
|
|
/* Emit the load constant instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
|
|
return pConstObj;
|
|
}
|
|
/*
|
|
* Compile a double quoted string.
|
|
* According to the PHP language reference manual
|
|
* Double quoted
|
|
* If the string is enclosed in double-quotes ("), PHP will interpret more escape sequences for special characters:
|
|
* Escaped characters Sequence Meaning
|
|
* \n linefeed (LF or 0x0A (10) in ASCII)
|
|
* \r carriage return (CR or 0x0D (13) in ASCII)
|
|
* \t horizontal tab (HT or 0x09 (9) in ASCII)
|
|
* \v vertical tab (VT or 0x0B (11) in ASCII)
|
|
* \f form feed (FF or 0x0C (12) in ASCII)
|
|
* \\ backslash
|
|
* \$ dollar sign
|
|
* \" double-quote
|
|
* \[0-7]{1,3} the sequence of characters matching the regular expression is a character in octal notation
|
|
* \x[0-9A-Fa-f]{1,2} the sequence of characters matching the regular expression is a character in hexadecimal notation
|
|
* As in single quoted strings, escaping any other character will result in the backslash being printed too.
|
|
* The most important feature of double-quoted strings is the fact that variable names will be expanded.
|
|
* See string parsing for details.
|
|
*/
|
|
static sxi32 GenStateCompileString(ph7_gen_state *pGen) {
|
|
SyString *pStr = &pGen->pIn->sData; /* Raw token value */
|
|
const char *zIn, *zCur, *zEnd;
|
|
ph7_value *pObj = 0;
|
|
sxi32 iCons;
|
|
sxi32 rc;
|
|
/* Delimit the string */
|
|
zIn = pStr->zString;
|
|
zEnd = &zIn[pStr->nByte];
|
|
if(zIn >= zEnd) {
|
|
/* Empty string,load NULL */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0, 0, 0);
|
|
return SXRET_OK;
|
|
}
|
|
zCur = 0;
|
|
/* Compile the node */
|
|
iCons = 0;
|
|
for(;;) {
|
|
zCur = zIn;
|
|
while(zIn < zEnd && zIn[0] != '\\') {
|
|
if(zIn[0] == '{' && &zIn[1] < zEnd && zIn[1] == '$') {
|
|
break;
|
|
} else if(zIn[0] == '$' && &zIn[1] < zEnd &&
|
|
(((unsigned char)zIn[1] >= 0xc0 || SyisAlpha(zIn[1]) || zIn[1] == '{' || zIn[1] == '_'))) {
|
|
break;
|
|
}
|
|
zIn++;
|
|
}
|
|
if(zIn > zCur) {
|
|
if(pObj == 0) {
|
|
pObj = GenStateNewStrObj(&(*pGen), &iCons);
|
|
if(pObj == 0) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
PH7_MemObjStringAppend(pObj, zCur, (sxu32)(zIn - zCur));
|
|
}
|
|
if(zIn >= zEnd) {
|
|
break;
|
|
}
|
|
if(zIn[0] == '\\') {
|
|
const char *zPtr = 0;
|
|
sxu32 n;
|
|
zIn++;
|
|
if(zIn >= zEnd) {
|
|
break;
|
|
}
|
|
if(pObj == 0) {
|
|
pObj = GenStateNewStrObj(&(*pGen), &iCons);
|
|
if(pObj == 0) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
n = sizeof(char); /* size of conversion */
|
|
switch(zIn[0]) {
|
|
case '$':
|
|
/* Dollar sign */
|
|
PH7_MemObjStringAppend(pObj, "$", sizeof(char));
|
|
break;
|
|
case '\\':
|
|
/* A literal backslash */
|
|
PH7_MemObjStringAppend(pObj, "\\", sizeof(char));
|
|
break;
|
|
case 'a':
|
|
/* The "alert" character (BEL)[ctrl+g] ASCII code 7 */
|
|
PH7_MemObjStringAppend(pObj, "\a", sizeof(char));
|
|
break;
|
|
case 'b':
|
|
/* Backspace (BS)[ctrl+h] ASCII code 8 */
|
|
PH7_MemObjStringAppend(pObj, "\b", sizeof(char));
|
|
break;
|
|
case 'f':
|
|
/* Form-feed (FF)[ctrl+l] ASCII code 12 */
|
|
PH7_MemObjStringAppend(pObj, "\f", sizeof(char));
|
|
break;
|
|
case 'n':
|
|
/* Line feed(new line) (LF)[ctrl+j] ASCII code 10 */
|
|
PH7_MemObjStringAppend(pObj, "\n", sizeof(char));
|
|
break;
|
|
case 'r':
|
|
/* Carriage return (CR)[ctrl+m] ASCII code 13 */
|
|
PH7_MemObjStringAppend(pObj, "\r", sizeof(char));
|
|
break;
|
|
case 't':
|
|
/* Horizontal tab (HT)[ctrl+i] ASCII code 9 */
|
|
PH7_MemObjStringAppend(pObj, "\t", sizeof(char));
|
|
break;
|
|
case 'v':
|
|
/* Vertical tab(VT)[ctrl+k] ASCII code 11 */
|
|
PH7_MemObjStringAppend(pObj, "\v", sizeof(char));
|
|
break;
|
|
case '\'':
|
|
/* Single quote */
|
|
PH7_MemObjStringAppend(pObj, "'", sizeof(char));
|
|
break;
|
|
case '"':
|
|
/* Double quote */
|
|
PH7_MemObjStringAppend(pObj, "\"", sizeof(char));
|
|
break;
|
|
case '0':
|
|
/* NUL byte */
|
|
PH7_MemObjStringAppend(pObj, "\0", sizeof(char));
|
|
break;
|
|
case 'x':
|
|
if((unsigned char)zIn[1] < 0xc0 && SyisHex(zIn[1])) {
|
|
int c;
|
|
/* Hex digit */
|
|
c = SyHexToint(zIn[1]) << 4;
|
|
if(&zIn[2] < zEnd) {
|
|
c += SyHexToint(zIn[2]);
|
|
}
|
|
/* Output char */
|
|
PH7_MemObjStringAppend(pObj, (const char *)&c, sizeof(char));
|
|
n += sizeof(char) * 2;
|
|
} else {
|
|
/* Output literal character */
|
|
PH7_MemObjStringAppend(pObj, "x", sizeof(char));
|
|
}
|
|
break;
|
|
case 'o':
|
|
if(&zIn[1] < zEnd && (unsigned char)zIn[1] < 0xc0 && SyisDigit(zIn[1]) && (zIn[1] - '0') < 8) {
|
|
/* Octal digit stream */
|
|
int c;
|
|
c = 0;
|
|
zIn++;
|
|
for(zPtr = zIn ; zPtr < &zIn[3 * sizeof(char)] ; zPtr++) {
|
|
if(zPtr >= zEnd || (unsigned char)zPtr[0] >= 0xc0 || !SyisDigit(zPtr[0]) || (zPtr[0] - '0') > 7) {
|
|
break;
|
|
}
|
|
c = c * 8 + (zPtr[0] - '0');
|
|
}
|
|
if(c > 0) {
|
|
PH7_MemObjStringAppend(pObj, (const char *)&c, sizeof(char));
|
|
}
|
|
n = (sxu32)(zPtr - zIn);
|
|
} else {
|
|
/* Output literal character */
|
|
PH7_MemObjStringAppend(pObj, "o", sizeof(char));
|
|
}
|
|
break;
|
|
default:
|
|
/* Output without a slash */
|
|
PH7_MemObjStringAppend(pObj, zIn, sizeof(char));
|
|
break;
|
|
}
|
|
/* Advance the stream cursor */
|
|
zIn += n;
|
|
continue;
|
|
}
|
|
if(zIn[0] == '{') {
|
|
/* Curly syntax */
|
|
const char *zExpr;
|
|
sxi32 iNest = 1;
|
|
zIn++;
|
|
zExpr = zIn;
|
|
/* Synchronize with the next closing curly braces */
|
|
while(zIn < zEnd) {
|
|
if(zIn[0] == '{') {
|
|
/* Increment nesting level */
|
|
iNest++;
|
|
} else if(zIn[0] == '}') {
|
|
/* Decrement nesting level */
|
|
iNest--;
|
|
if(iNest <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
zIn++;
|
|
}
|
|
/* Process the expression */
|
|
rc = GenStateProcessStringExpression(&(*pGen), pGen->pIn->nLine, zExpr, zIn);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(rc != SXERR_EMPTY) {
|
|
++iCons;
|
|
}
|
|
if(zIn < zEnd) {
|
|
/* Jump the trailing curly */
|
|
zIn++;
|
|
}
|
|
} else {
|
|
/* Simple syntax */
|
|
const char *zExpr = zIn;
|
|
/* Assemble variable name */
|
|
for(;;) {
|
|
/* Jump leading dollars */
|
|
while(zIn < zEnd && zIn[0] == '$') {
|
|
zIn++;
|
|
}
|
|
for(;;) {
|
|
while(zIn < zEnd && (unsigned char)zIn[0] < 0xc0 && (SyisAlphaNum(zIn[0]) || zIn[0] == '_')) {
|
|
zIn++;
|
|
}
|
|
if((unsigned char)zIn[0] >= 0xc0) {
|
|
/* UTF-8 stream */
|
|
zIn++;
|
|
while(zIn < zEnd && (((unsigned char)zIn[0] & 0xc0) == 0x80)) {
|
|
zIn++;
|
|
}
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if(zIn >= zEnd) {
|
|
break;
|
|
}
|
|
if(zIn[0] == '[') {
|
|
sxi32 iSquare = 1;
|
|
zIn++;
|
|
while(zIn < zEnd) {
|
|
if(zIn[0] == '[') {
|
|
iSquare++;
|
|
} else if(zIn[0] == ']') {
|
|
iSquare--;
|
|
if(iSquare <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
zIn++;
|
|
}
|
|
if(zIn < zEnd) {
|
|
zIn++;
|
|
}
|
|
break;
|
|
} else if(zIn[0] == '{') {
|
|
sxi32 iCurly = 1;
|
|
zIn++;
|
|
while(zIn < zEnd) {
|
|
if(zIn[0] == '{') {
|
|
iCurly++;
|
|
} else if(zIn[0] == '}') {
|
|
iCurly--;
|
|
if(iCurly <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
zIn++;
|
|
}
|
|
if(zIn < zEnd) {
|
|
zIn++;
|
|
}
|
|
break;
|
|
} else if(zIn[0] == '-' && &zIn[1] < zEnd && zIn[1] == '>') {
|
|
/* Member access operator '->' */
|
|
zIn += 2;
|
|
} else if(zIn[0] == ':' && &zIn[1] < zEnd && zIn[1] == ':') {
|
|
/* Static member access operator '::' */
|
|
zIn += 2;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
/* Process the expression */
|
|
rc = GenStateProcessStringExpression(&(*pGen), pGen->pIn->nLine, zExpr, zIn);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(rc != SXERR_EMPTY) {
|
|
++iCons;
|
|
}
|
|
}
|
|
/* Invalidate the previously used constant */
|
|
pObj = 0;
|
|
}/*for(;;)*/
|
|
if(iCons > 1) {
|
|
/* Concatenate all compiled constants */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_CAT, iCons, 0, 0, 0);
|
|
}
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a double quoted string.
|
|
* See the block-comment above for more information.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileString(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
sxi32 rc;
|
|
rc = GenStateCompileString(&(*pGen));
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
/* Compilation result */
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile an array entry whether it is a key or a value.
|
|
* Notes on array entries.
|
|
* According to the PHP language reference manual
|
|
* An array can be created by the array() language construct.
|
|
* It takes as parameters any number of comma-separated key => value pairs.
|
|
* array( key => value
|
|
* , ...
|
|
* )
|
|
* A key may be either an integer or a string. If a key is the standard representation
|
|
* of an integer, it will be interpreted as such (i.e. "8" will be interpreted as 8, while
|
|
* "08" will be interpreted as "08"). Floats in key are truncated to integer.
|
|
* The indexed and associative array types are the same type in PHP, which can both
|
|
* contain integer and string indices.
|
|
* A value can be any PHP type.
|
|
* If a key is not specified for a value, the maximum of the integer indices is taken
|
|
* and the new key will be that value plus 1. If a key that already has an assigned value
|
|
* is specified, that value will be overwritten.
|
|
*/
|
|
static sxi32 GenStateCompileArrayEntry(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
SyToken *pIn, /* Token stream */
|
|
SyToken *pEnd, /* End of the token stream */
|
|
sxi32 iFlags, /* Compilation flags */
|
|
sxi32(*xValidator)(ph7_gen_state *, ph7_expr_node *) /* Expression tree validator callback */
|
|
) {
|
|
SyToken *pTmpIn, *pTmpEnd;
|
|
sxi32 rc;
|
|
/* Swap token stream */
|
|
SWAP_DELIMITER(pGen, pIn, pEnd);
|
|
/* Compile the expression*/
|
|
rc = PH7_CompileExpr(&(*pGen), iFlags, xValidator);
|
|
/* Restore token stream */
|
|
RE_SWAP_DELIMITER(pGen);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Expression tree validator callback for the 'array' language construct.
|
|
* Return SXRET_OK if the tree is valid. Any other return value indicates
|
|
* an invalid expression tree and this function will generate the appropriate
|
|
* error message.
|
|
* See the routine responible of compiling the array language construct
|
|
* for more inforation.
|
|
*/
|
|
static sxi32 GenStateArrayNodeValidator(ph7_gen_state *pGen, ph7_expr_node *pRoot) {
|
|
sxi32 rc = SXRET_OK;
|
|
if(pRoot->pOp) {
|
|
if(pRoot->pOp->iOp != EXPR_OP_SUBSCRIPT /* $a[] */ &&
|
|
pRoot->pOp->iOp != EXPR_OP_FUNC_CALL /* function() [Symisc extension: i.e: array(&foo())] */
|
|
&& pRoot->pOp->iOp != EXPR_OP_ARROW /* -> */ && pRoot->pOp->iOp != EXPR_OP_DC /* :: */) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"array(): Expecting a variable/array member/function call after reference operator '&'");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
} else if(pRoot->xCode != PH7_CompileVariable) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"array(): Expecting a variable after reference operator '&'");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile the 'array' language construct.
|
|
* According to the PHP language reference manual
|
|
* An array in PHP is actually an ordered map. A map is a type that associates
|
|
* values to keys. This type is optimized for several different uses; it can
|
|
* be treated as an array, list (vector), hash table (an implementation of a map)
|
|
* dictionary, collection, stack, queue, and probably more. As array values can be
|
|
* other arrays, trees and multidimensional arrays are also possible.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileArray(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
sxi32(*xValidator)(ph7_gen_state *, ph7_expr_node *); /* Expression tree validator callback */
|
|
SyToken *pKey, *pCur;
|
|
sxi32 iEmitRef = 0;
|
|
sxi32 nPair = 0;
|
|
sxi32 iNest;
|
|
sxi32 rc;
|
|
/* Jump the 'array' keyword,the leading left parenthesis and the trailing parenthesis.
|
|
*/
|
|
pGen->pIn += 2;
|
|
pGen->pEnd--;
|
|
xValidator = 0;
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
for(;;) {
|
|
/* Jump leading commas */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_COMMA)) {
|
|
pGen->pIn++;
|
|
}
|
|
pCur = pGen->pIn;
|
|
if(SXRET_OK != PH7_GetNextExpr(pGen->pIn, pGen->pEnd, &pGen->pIn)) {
|
|
/* No more entry to process */
|
|
break;
|
|
}
|
|
if(pCur >= pGen->pIn) {
|
|
continue;
|
|
}
|
|
/* Compile the key if available */
|
|
pKey = pCur;
|
|
iNest = 0;
|
|
while(pCur < pGen->pIn) {
|
|
if((pCur->nType & PH7_TK_ARRAY_OP) && iNest <= 0) {
|
|
break;
|
|
}
|
|
if(pCur->nType & PH7_TK_LPAREN /*'('*/) {
|
|
iNest++;
|
|
} else if(pCur->nType & PH7_TK_RPAREN /*')'*/) {
|
|
/* Don't worry about mismatched parenthesis here,the expression
|
|
* parser will shortly detect any syntax error.
|
|
*/
|
|
iNest--;
|
|
}
|
|
pCur++;
|
|
}
|
|
rc = SXERR_EMPTY;
|
|
if(pCur < pGen->pIn) {
|
|
if(&pCur[1] >= pGen->pIn) {
|
|
/* Missing value */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pCur->nLine, "array(): Missing entry value");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Compile the expression holding the key */
|
|
rc = GenStateCompileArrayEntry(&(*pGen), pKey, pCur,
|
|
EXPR_FLAG_RDONLY_LOAD/*Do not create the variable if inexistant*/, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
pCur++; /* Jump the '=>' operator */
|
|
} else if(pKey == pCur) {
|
|
/* Key is omitted,emit a warning */
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pCur->nLine, "array(): Missing entry key");
|
|
pCur++; /* Jump the '=>' operator */
|
|
} else {
|
|
/* Reset back the cursor and point to the entry value */
|
|
pCur = pKey;
|
|
}
|
|
if(rc == SXERR_EMPTY) {
|
|
/* No available key,load NULL */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0 /* nil index */, 0, 0);
|
|
}
|
|
if(pCur->nType & PH7_TK_AMPER /*'&'*/) {
|
|
/* Insertion by reference, [i.e: $a = array(&$x);] */
|
|
xValidator = GenStateArrayNodeValidator; /* Only variable are allowed */
|
|
iEmitRef = 1;
|
|
pCur++; /* Jump the '&' token */
|
|
if(pCur >= pGen->pIn) {
|
|
/* Missing value */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pCur->nLine, "array(): Missing referenced variable");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
}
|
|
/* Compile indice value */
|
|
rc = GenStateCompileArrayEntry(&(*pGen), pCur, pGen->pIn, EXPR_FLAG_RDONLY_LOAD/*Do not create the variable if inexistant*/, xValidator);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(iEmitRef) {
|
|
/* Emit the load reference instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD_REF, 0, 0, 0, 0);
|
|
}
|
|
xValidator = 0;
|
|
iEmitRef = 0;
|
|
nPair++;
|
|
}
|
|
/* Emit the load map instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD_MAP, nPair * 2, 0, 0, 0);
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Expression tree validator callback for the 'list' language construct.
|
|
* Return SXRET_OK if the tree is valid. Any other return value indicates
|
|
* an invalid expression tree and this function will generate the appropriate
|
|
* error message.
|
|
* See the routine responible of compiling the list language construct
|
|
* for more inforation.
|
|
*/
|
|
static sxi32 GenStateListNodeValidator(ph7_gen_state *pGen, ph7_expr_node *pRoot) {
|
|
sxi32 rc = SXRET_OK;
|
|
if(pRoot->pOp) {
|
|
if(pRoot->pOp->iOp != EXPR_OP_SUBSCRIPT /* $a[] */ && pRoot->pOp->iOp != EXPR_OP_ARROW /* -> */
|
|
&& pRoot->pOp->iOp != EXPR_OP_DC /* :: */) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"list(): Expecting a variable not an expression");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
} else if(pRoot->xCode != PH7_CompileVariable) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"list(): Expecting a variable not an expression");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile the 'list' language construct.
|
|
* According to the PHP language reference
|
|
* list(): Assign variables as if they were an array.
|
|
* list() is used to assign a list of variables in one operation.
|
|
* Description
|
|
* array list (mixed $varname [, mixed $... ] )
|
|
* Like array(), this is not really a function, but a language construct.
|
|
* list() is used to assign a list of variables in one operation.
|
|
* Parameters
|
|
* $varname: A variable.
|
|
* Return Values
|
|
* The assigned array.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileList(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
SyToken *pNext;
|
|
sxi32 nExpr;
|
|
sxi32 rc;
|
|
nExpr = 0;
|
|
/* Jump the 'list' keyword,the leading left parenthesis and the trailing parenthesis */
|
|
pGen->pIn += 2;
|
|
pGen->pEnd--;
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
while(SXRET_OK == PH7_GetNextExpr(pGen->pIn, pGen->pEnd, &pNext)) {
|
|
if(pGen->pIn < pNext) {
|
|
/* Compile the expression holding the variable */
|
|
rc = GenStateCompileArrayEntry(&(*pGen), pGen->pIn, pNext, EXPR_FLAG_LOAD_IDX_STORE, GenStateListNodeValidator);
|
|
if(rc != SXRET_OK) {
|
|
/* Do not bother compiling this expression, it's broken anyway */
|
|
return SXRET_OK;
|
|
}
|
|
} else {
|
|
/* Empty entry,load NULL */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0/* NULL index */, 0, 0);
|
|
}
|
|
nExpr++;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn = &pNext[1];
|
|
}
|
|
/* Emit the LOAD_LIST instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD_LIST, nExpr, 0, 0, 0);
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/* Forward declaration */
|
|
static sxi32 GenStateCompileFunc(ph7_gen_state *pGen, SyString *pName, sxi32 iFlags, int bHandleClosure, ph7_vm_func **ppFunc);
|
|
/*
|
|
* Compile an annoynmous function or a closure.
|
|
* According to the PHP language reference
|
|
* Anonymous functions, also known as closures, allow the creation of functions
|
|
* which have no specified name. They are most useful as the value of callback
|
|
* parameters, but they have many other uses. Closures can also be used as
|
|
* the values of variables; Assigning a closure to a variable uses the same
|
|
* syntax as any other assignment, including the trailing semicolon:
|
|
* Example Anonymous function variable assignment example
|
|
* <?php
|
|
* $greet = function($name)
|
|
* {
|
|
* printf("Hello %s\r\n", $name);
|
|
* };
|
|
* $greet('World');
|
|
* $greet('PHP');
|
|
* ?>
|
|
* Note that the implementation of annoynmous function and closure under
|
|
* PH7 is completely different from the one used by the zend engine.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileAnnonFunc(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
ph7_vm_func *pAnnonFunc; /* Annonymous function body */
|
|
char zName[512]; /* Unique lambda name */
|
|
static int iCnt = 1; /* There is no worry about thread-safety here,because only
|
|
* one thread is allowed to compile the script.
|
|
*/
|
|
ph7_value *pObj;
|
|
SyString sName;
|
|
sxu32 nIdx;
|
|
sxu32 nLen;
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'function' keyword */
|
|
if(pGen->pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD)) {
|
|
pGen->pIn++;
|
|
}
|
|
/* Reserve a constant for the lambda */
|
|
pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
|
|
if(pObj == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, 1, "Fatal, PH7 engine is running out of memory");
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Generate a unique name */
|
|
nLen = SyBufferFormat(zName, sizeof(zName), "[lambda_%d]", iCnt++);
|
|
/* Make sure the generated name is unique */
|
|
while(SyHashGet(&pGen->pVm->hFunction, zName, nLen) != 0 && nLen < sizeof(zName) - 2) {
|
|
nLen = SyBufferFormat(zName, sizeof(zName), "[lambda_%d]", iCnt++);
|
|
}
|
|
SyStringInitFromBuf(&sName, zName, nLen);
|
|
PH7_MemObjInitFromString(pGen->pVm, pObj, &sName);
|
|
/* Compile the lambda body */
|
|
rc = GenStateCompileFunc(&(*pGen), &sName, 0, TRUE, &pAnnonFunc);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(pAnnonFunc->iFlags & VM_FUNC_CLOSURE) {
|
|
/* Emit the load closure instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD_CLOSURE, 0, 0, pAnnonFunc, 0);
|
|
} else {
|
|
/* Emit the load constant instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
|
|
}
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a backtick quoted string.
|
|
*/
|
|
static sxi32 PH7_CompileBacktic(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
/* TICKET 1433-40: This construct is disabled in the current release of the PH7 engine.
|
|
* If you want this feature,please contact symisc systems via contact@symisc.net
|
|
*/
|
|
PH7_GenCompileError(&(*pGen), E_NOTICE, pGen->pIn->nLine,
|
|
"Command line invocation is disabled in the current release of the PH7(%s) engine",
|
|
ph7_lib_version()
|
|
);
|
|
/* Load NULL */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0, 0, 0);
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a function [i.e: die(),exit(),include(),...] which is a langauge
|
|
* construct.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileLangConstruct(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
SyString *pName;
|
|
sxu32 nKeyID;
|
|
sxi32 rc;
|
|
/* Name of the language construct [i.e: echo,die...]*/
|
|
pName = &pGen->pIn->sData;
|
|
nKeyID = (sxu32)SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
pGen->pIn++; /* Jump the language construct keyword */
|
|
if(nKeyID == PH7_TKWRD_ECHO) {
|
|
SyToken *pTmp, *pNext = 0;
|
|
/* Compile arguments one after one */
|
|
pTmp = pGen->pEnd;
|
|
/* Symisc eXtension to the PHP programming language:
|
|
* 'echo' can be used in the context of a function which
|
|
* mean that the following expression is valid:
|
|
* fopen('file.txt','r') or echo "IO error";
|
|
*/
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 1 /* Boolean true index */, 0, 0);
|
|
while(SXRET_OK == PH7_GetNextExpr(pGen->pIn, pTmp, &pNext)) {
|
|
if(pGen->pIn < pNext) {
|
|
pGen->pEnd = pNext;
|
|
rc = PH7_CompileExpr(&(*pGen), EXPR_FLAG_RDONLY_LOAD/* Do not create variable if inexistant */, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(rc != SXERR_EMPTY) {
|
|
/* Ticket 1433-008: Optimization #1: Consume input directly
|
|
* without the overhead of a function call.
|
|
* This is a very powerful optimization that improve
|
|
* performance greatly.
|
|
*/
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_CONSUME, 1, 0, 0, 0);
|
|
}
|
|
}
|
|
/* Jump trailing commas */
|
|
while(pNext < pTmp && (pNext->nType & PH7_TK_COMMA)) {
|
|
pNext++;
|
|
}
|
|
pGen->pIn = pNext;
|
|
}
|
|
/* Restore token stream */
|
|
pGen->pEnd = pTmp;
|
|
} else {
|
|
sxi32 nArg = 0;
|
|
sxu32 nIdx = 0;
|
|
rc = PH7_CompileExpr(&(*pGen), EXPR_FLAG_RDONLY_LOAD/* Do not create variable if inexistant */, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
nArg = 1;
|
|
}
|
|
if(SXRET_OK != GenStateFindLiteral(&(*pGen), pName, &nIdx)) {
|
|
ph7_value *pObj;
|
|
/* Emit the call instruction */
|
|
pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
|
|
if(pObj == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, 1, "Fatal, PH7 engine is running out of memory");
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
return SXERR_ABORT;
|
|
}
|
|
PH7_MemObjInitFromString(pGen->pVm, pObj, pName);
|
|
/* Install in the literal table */
|
|
GenStateInstallLiteral(&(*pGen), pObj, nIdx);
|
|
}
|
|
/* Emit the call instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_CALL, nArg, 0, 0, 0);
|
|
}
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a node holding a variable declaration.
|
|
* According to the PHP language reference
|
|
* Variables in PHP are represented by a dollar sign followed by the name of the variable.
|
|
* The variable name is case-sensitive.
|
|
* Variable names follow the same rules as other labels in PHP. A valid variable name starts
|
|
* with a letter or underscore, followed by any number of letters, numbers, or underscores.
|
|
* As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'
|
|
* Note: For our purposes here, a letter is a-z, A-Z, and the bytes from 127 through 255 (0x7f-0xff).
|
|
* Note: $this is a special variable that can't be assigned.
|
|
* By default, variables are always assigned by value. That is to say, when you assign an expression
|
|
* to a variable, the entire value of the original expression is copied into the destination variable.
|
|
* This means, for instance, that after assigning one variable's value to another, changing one of those
|
|
* variables will have no effect on the other. For more information on this kind of assignment, see
|
|
* the chapter on Expressions.
|
|
* PHP also offers another way to assign values to variables: assign by reference. This means that
|
|
* the new variable simply references (in other words, "becomes an alias for" or "points to") the original
|
|
* variable. Changes to the new variable affect the original, and vice versa.
|
|
* To assign by reference, simply prepend an ampersand (&) to the beginning of the variable which
|
|
* is being assigned (the source variable).
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileVariable(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
sxi32 iVv;
|
|
sxi32 iP1;
|
|
void *p3;
|
|
sxi32 rc;
|
|
iVv = -1; /* Variable variable counter */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_DOLLAR)) {
|
|
pGen->pIn++;
|
|
iVv++;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD | PH7_TK_OCB/*'{'*/)) == 0) {
|
|
/* Invalid variable name */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Invalid variable name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
p3 = 0;
|
|
if(pGen->pIn->nType & PH7_TK_OCB/*'{'*/) {
|
|
/* Dynamic variable creation */
|
|
pGen->pIn++; /* Jump the open curly */
|
|
pGen->pEnd--; /* Ignore the trailing curly */
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* Empty expression */
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Invalid variable name");
|
|
return SXRET_OK;
|
|
}
|
|
/* Compile the expression holding the variable name */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc == SXERR_EMPTY) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Missing variable name");
|
|
return SXRET_OK;
|
|
}
|
|
} else {
|
|
SyHashEntry *pEntry;
|
|
SyString *pName;
|
|
char *zName = 0;
|
|
/* Extract variable name */
|
|
pName = &pGen->pIn->sData;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
pEntry = SyHashGet(&pGen->hVar, (const void *)pName->zString, pName->nByte);
|
|
if(pEntry == 0) {
|
|
/* Duplicate name */
|
|
zName = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zName == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Install in the hashtable */
|
|
SyHashInsert(&pGen->hVar, zName, pName->nByte, zName);
|
|
} else {
|
|
/* Name already available */
|
|
zName = (char *)pEntry->pUserData;
|
|
}
|
|
p3 = (void *)zName;
|
|
}
|
|
iP1 = 0;
|
|
if(iCompileFlag & EXPR_FLAG_RDONLY_LOAD) {
|
|
if((iCompileFlag & EXPR_FLAG_LOAD_IDX_STORE) == 0) {
|
|
/* Read-only load.In other words do not create the variable if inexistant */
|
|
iP1 = 1;
|
|
}
|
|
}
|
|
/* Emit the load instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD, iP1, 0, p3, 0);
|
|
while(iVv > 0) {
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD, iP1, 0, 0, 0);
|
|
iVv--;
|
|
}
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Load a literal.
|
|
*/
|
|
static sxi32 GenStateLoadLiteral(ph7_gen_state *pGen) {
|
|
SyToken *pToken = pGen->pIn;
|
|
ph7_value *pObj;
|
|
SyString *pStr;
|
|
sxu32 nIdx;
|
|
/* Extract token value */
|
|
pStr = &pToken->sData;
|
|
/* Deal with the reserved literals [i.e: null,false,true,...] first */
|
|
if(pStr->nByte == sizeof("NULL") - 1) {
|
|
if(SyStrnicmp(pStr->zString, "null", sizeof("NULL") - 1) == 0) {
|
|
/* NULL constant are always indexed at 0 */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0, 0, 0);
|
|
return SXRET_OK;
|
|
} else if(SyStrnicmp(pStr->zString, "true", sizeof("TRUE") - 1) == 0) {
|
|
/* TRUE constant are always indexed at 1 */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 1, 0, 0);
|
|
return SXRET_OK;
|
|
}
|
|
} else if(pStr->nByte == sizeof("FALSE") - 1 &&
|
|
SyStrnicmp(pStr->zString, "false", sizeof("FALSE") - 1) == 0) {
|
|
/* FALSE constant are always indexed at 2 */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 2, 0, 0);
|
|
return SXRET_OK;
|
|
} else if(pStr->nByte == sizeof("__LINE__") - 1 &&
|
|
SyMemcmp(pStr->zString, "__LINE__", sizeof("__LINE__") - 1) == 0) {
|
|
/* TICKET 1433-004: __LINE__ constant must be resolved at compile time,not run time */
|
|
pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
|
|
if(pObj == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, pToken->nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
PH7_MemObjInitFromInt(pGen->pVm, pObj, pToken->nLine);
|
|
/* Emit the load constant instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
|
|
return SXRET_OK;
|
|
} else if((pStr->nByte == sizeof("__FUNCTION__") - 1 &&
|
|
SyMemcmp(pStr->zString, "__FUNCTION__", sizeof("__FUNCTION__") - 1) == 0) ||
|
|
(pStr->nByte == sizeof("__METHOD__") - 1 &&
|
|
SyMemcmp(pStr->zString, "__METHOD__", sizeof("__METHOD__") - 1) == 0)) {
|
|
GenBlock *pBlock = pGen->pCurrent;
|
|
/* TICKET 1433-004: __FUNCTION__/__METHOD__ constants must be resolved at compile time,not run time */
|
|
while(pBlock && (pBlock->iFlags & GEN_BLOCK_FUNC) == 0) {
|
|
/* Point to the upper block */
|
|
pBlock = pBlock->pParent;
|
|
}
|
|
if(pBlock == 0) {
|
|
/* Called in the global scope,load NULL */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0, 0, 0);
|
|
} else {
|
|
/* Extract the target function/method */
|
|
ph7_vm_func *pFunc = (ph7_vm_func *)pBlock->pUserData;
|
|
if(pStr->zString[2] == 'M' /* METHOD */ && (pFunc->iFlags & VM_FUNC_CLASS_METHOD) == 0) {
|
|
/* Not a class method,Load null */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, 0, 0, 0);
|
|
} else {
|
|
pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
|
|
if(pObj == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, pToken->nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
PH7_MemObjInitFromString(pGen->pVm, pObj, &pFunc->sName);
|
|
/* Emit the load constant instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nIdx, 0, 0);
|
|
}
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Query literal table */
|
|
if(SXRET_OK != GenStateFindLiteral(&(*pGen), &pToken->sData, &nIdx)) {
|
|
ph7_value *pObj;
|
|
/* Unknown literal,install it in the literal table */
|
|
pObj = PH7_ReserveConstObj(pGen->pVm, &nIdx);
|
|
if(pObj == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, 1, "PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
PH7_MemObjInitFromString(pGen->pVm, pObj, &pToken->sData);
|
|
GenStateInstallLiteral(&(*pGen), pObj, nIdx);
|
|
}
|
|
/* Emit the load constant instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 1, nIdx, 0, 0);
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Resolve a namespace path or simply load a literal:
|
|
* As of this version namespace support is disabled. If you need
|
|
* a working version that implement namespace,please contact
|
|
* symisc systems via contact@symisc.net
|
|
*/
|
|
static sxi32 GenStateResolveNamespaceLiteral(ph7_gen_state *pGen) {
|
|
int emit = 0;
|
|
sxi32 rc;
|
|
while(pGen->pIn < &pGen->pEnd[-1]) {
|
|
/* Emit a warning */
|
|
if(!emit) {
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn->nLine,
|
|
"Namespace support is disabled in the current release of the PH7(%s) engine",
|
|
ph7_lib_version()
|
|
);
|
|
emit = 1;
|
|
}
|
|
pGen->pIn++; /* Ignore the token */
|
|
}
|
|
/* Load literal */
|
|
rc = GenStateLoadLiteral(&(*pGen));
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a literal which is an identifier(name) for a simple value.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileLiteral(ph7_gen_state *pGen, sxi32 iCompileFlag) {
|
|
sxi32 rc;
|
|
rc = GenStateResolveNamespaceLiteral(&(*pGen));
|
|
if(rc != SXRET_OK) {
|
|
SXUNUSED(iCompileFlag); /* cc warning */
|
|
return rc;
|
|
}
|
|
/* Node successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Recover from a compile-time error. In other words synchronize
|
|
* the token stream cursor with the first semi-colon seen.
|
|
*/
|
|
static sxi32 PH7_ErrorRecover(ph7_gen_state *pGen) {
|
|
/* Synchronize with the next-semi-colon and avoid compiling this erroneous statement */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI /*';'*/) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Check if the given identifier name is reserved or not.
|
|
* Return TRUE if reserved.FALSE otherwise.
|
|
*/
|
|
static int GenStateIsReservedConstant(SyString *pName) {
|
|
if(pName->nByte == sizeof("null") - 1) {
|
|
if(SyStrnicmp(pName->zString, "null", sizeof("null") - 1) == 0) {
|
|
return TRUE;
|
|
} else if(SyStrnicmp(pName->zString, "true", sizeof("true") - 1) == 0) {
|
|
return TRUE;
|
|
}
|
|
} else if(pName->nByte == sizeof("false") - 1) {
|
|
if(SyStrnicmp(pName->zString, "false", sizeof("false") - 1) == 0) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
/* Not a reserved constant */
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* Compile the 'const' statement.
|
|
* According to the PHP language reference
|
|
* A constant is an identifier (name) for a simple value. As the name suggests, that value
|
|
* cannot change during the execution of the script (except for magic constants, which aren't actually constants).
|
|
* A constant is case-sensitive by default. By convention, constant identifiers are always uppercase.
|
|
* The name of a constant follows the same rules as any label in PHP. A valid constant name starts
|
|
* with a letter or underscore, followed by any number of letters, numbers, or underscores.
|
|
* As a regular expression it would be expressed thusly: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*
|
|
* Syntax
|
|
* You can define a constant by using the define()-function or by using the const keyword outside
|
|
* a class definition. Once a constant is defined, it can never be changed or undefined.
|
|
* You can get the value of a constant by simply specifying its name. Unlike with variables
|
|
* you should not prepend a constant with a $. You can also use the function constant() to read
|
|
* a constant's value if you wish to obtain the constant's name dynamically. Use get_defined_constants()
|
|
* to get a list of all defined constants.
|
|
*
|
|
* Symisc eXtension.
|
|
* PH7 allow any complex expression to be associated with the constant while the zend engine
|
|
* would allow only simple scalar value.
|
|
* Example
|
|
* const HELLO = "Welcome "." guest ".rand_str(3); //Valid under PH7/Generate error using the zend engine
|
|
* Refer to the official documentation for more information on this feature.
|
|
*/
|
|
static sxi32 PH7_CompileConstant(ph7_gen_state *pGen) {
|
|
SySet *pConsCode, *pInstrContainer;
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
SyString *pName;
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'const' keyword */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_SSTR | PH7_TK_DSTR | PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
/* Invalid constant name */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "const: Invalid constant name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Peek constant name */
|
|
pName = &pGen->pIn->sData;
|
|
/* Make sure the constant name isn't reserved */
|
|
if(GenStateIsReservedConstant(pName)) {
|
|
/* Reserved constant */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "const: Cannot redeclare a reserved constant '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_EQUAL /* '=' */) == 0) {
|
|
/* Invalid statement*/
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "const: Expected '=' after constant name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
pGen->pIn++; /*Jump the equal sign */
|
|
/* Allocate a new constant value container */
|
|
pConsCode = (SySet *)SyMemBackendPoolAlloc(&pGen->pVm->sAllocator, sizeof(SySet));
|
|
if(pConsCode == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
SySetInit(pConsCode, &pGen->pVm->sAllocator, sizeof(VmInstr));
|
|
/* Swap bytecode container */
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pConsCode);
|
|
/* Compile constant value */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, (rc != SXERR_EMPTY ? 1 : 0), 0, 0, 0);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
SySetSetUserData(pConsCode, pGen->pVm);
|
|
/* Register the constant */
|
|
rc = PH7_VmRegisterConstant(pGen->pVm, pName, PH7_VmExpandConstantValue, pConsCode);
|
|
if(rc != SXRET_OK) {
|
|
SySetRelease(pConsCode);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pConsCode);
|
|
}
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the next-semi-colon and avoid compiling this erroneous statement */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the 'continue' statement.
|
|
* According to the PHP language reference
|
|
* continue is used within looping structures to skip the rest of the current loop iteration
|
|
* and continue execution at the condition evaluation and then the beginning of the next
|
|
* iteration.
|
|
* Note: Note that in PHP the switch statement is considered a looping structure for
|
|
* the purposes of continue.
|
|
* continue accepts an optional numeric argument which tells it how many levels
|
|
* of enclosing loops it should skip to the end of.
|
|
* Note:
|
|
* continue 0; and continue 1; is the same as running continue;.
|
|
*/
|
|
static sxi32 PH7_CompileContinue(ph7_gen_state *pGen) {
|
|
GenBlock *pLoop; /* Target loop */
|
|
sxi32 iLevel; /* How many nesting loop to skip */
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
iLevel = 0;
|
|
/* Jump the 'continue' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_NUM)) {
|
|
/* optional numeric argument which tells us how many levels
|
|
* of enclosing loops we should skip to the end of.
|
|
*/
|
|
iLevel = (sxi32)PH7_TokenValueToInt64(&pGen->pIn->sData);
|
|
if(iLevel < 2) {
|
|
iLevel = 0;
|
|
}
|
|
pGen->pIn++; /* Jump the optional numeric argument */
|
|
}
|
|
/* Point to the target loop */
|
|
pLoop = GenStateFetchBlock(pGen->pCurrent, GEN_BLOCK_LOOP, iLevel);
|
|
if(pLoop == 0) {
|
|
/* Illegal continue */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "A 'continue' statement may only be used within a loop or switch");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
sxu32 nInstrIdx = 0;
|
|
if(pLoop->iFlags & GEN_BLOCK_SWITCH) {
|
|
/* According to the PHP language reference manual
|
|
* Note that unlike some other languages, the continue statement applies to switch
|
|
* and acts similar to break. If you have a switch inside a loop and wish to continue
|
|
* to the next iteration of the outer loop, use continue 2.
|
|
*/
|
|
rc = PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, 0, 0, &nInstrIdx);
|
|
if(rc == SXRET_OK) {
|
|
GenStateNewJumpFixup(pLoop, PH7_OP_JMP, nInstrIdx);
|
|
}
|
|
} else {
|
|
/* Emit the unconditional jump to the beginning of the target loop */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, pLoop->nFirstInstr, 0, &nInstrIdx);
|
|
if(pLoop->bPostContinue == TRUE) {
|
|
JumpFixup sJumpFix;
|
|
/* Post-continue */
|
|
sJumpFix.nJumpType = PH7_OP_JMP;
|
|
sJumpFix.nInstrIdx = nInstrIdx;
|
|
SySetPut(&pLoop->aPostContFix, (const void *)&sJumpFix);
|
|
}
|
|
}
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
/* Not so fatal,emit a warning only */
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn->nLine, "Expected semi-colon ';' after 'continue' statement");
|
|
}
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the 'break' statement.
|
|
* According to the PHP language reference
|
|
* break ends execution of the current for, foreach, while, do-while or switch
|
|
* structure.
|
|
* break accepts an optional numeric argument which tells it how many nested
|
|
* enclosing structures are to be broken out of.
|
|
*/
|
|
static sxi32 PH7_CompileBreak(ph7_gen_state *pGen) {
|
|
GenBlock *pLoop; /* Target loop */
|
|
sxi32 iLevel; /* How many nesting loop to skip */
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
iLevel = 0;
|
|
/* Jump the 'break' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_NUM)) {
|
|
/* optional numeric argument which tells us how many levels
|
|
* of enclosing loops we should skip to the end of.
|
|
*/
|
|
iLevel = (sxi32)PH7_TokenValueToInt64(&pGen->pIn->sData);
|
|
if(iLevel < 2) {
|
|
iLevel = 0;
|
|
}
|
|
pGen->pIn++; /* Jump the optional numeric argument */
|
|
}
|
|
/* Extract the target loop */
|
|
pLoop = GenStateFetchBlock(pGen->pCurrent, GEN_BLOCK_LOOP, iLevel);
|
|
if(pLoop == 0) {
|
|
/* Illegal break */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "A 'break' statement may only be used within a loop or switch");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
sxu32 nInstrIdx;
|
|
rc = PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, 0, 0, &nInstrIdx);
|
|
if(rc == SXRET_OK) {
|
|
/* Fix the jump later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pLoop, PH7_OP_JMP, nInstrIdx);
|
|
}
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
/* Not so fatal,emit a warning only */
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn->nLine, "Expected semi-colon ';' after 'break' statement");
|
|
}
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Point to the next PHP chunk that will be processed shortly.
|
|
* Return SXRET_OK on success. Any other return value indicates
|
|
* failure.
|
|
*/
|
|
static sxi32 GenStateNextChunk(ph7_gen_state *pGen) {
|
|
ph7_value *pRawObj; /* Raw chunk [i.e: HTML,XML...] */
|
|
sxu32 nRawObj;
|
|
sxu32 nObjIdx;
|
|
/* Consume raw chunks verbatim without any processing until we get
|
|
* a PHP block.
|
|
*/
|
|
Consume:
|
|
nRawObj = nObjIdx = 0;
|
|
while(pGen->pRawIn < pGen->pRawEnd && pGen->pRawIn->nType != PH7_TOKEN_PHP) {
|
|
pRawObj = PH7_ReserveConstObj(pGen->pVm, &nObjIdx);
|
|
if(pRawObj == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, 1, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Mark as constant and emit the load constant instruction */
|
|
PH7_MemObjInitFromString(pGen->pVm, pRawObj, &pGen->pRawIn->sData);
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOADC, 0, nObjIdx, 0, 0);
|
|
++nRawObj;
|
|
pGen->pRawIn++; /* Next chunk */
|
|
}
|
|
if(nRawObj > 0) {
|
|
/* Emit the consume instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_CONSUME, nRawObj, 0, 0, 0);
|
|
}
|
|
if(pGen->pRawIn < pGen->pRawEnd) {
|
|
SySet *pTokenSet = pGen->pTokenSet;
|
|
/* Reset the token set */
|
|
SySetReset(pTokenSet);
|
|
/* Tokenize input */
|
|
PH7_TokenizePHP(SyStringData(&pGen->pRawIn->sData), SyStringLength(&pGen->pRawIn->sData),
|
|
pGen->pRawIn->nLine, pTokenSet);
|
|
/* Point to the fresh token stream */
|
|
pGen->pIn = (SyToken *)SySetBasePtr(pTokenSet);
|
|
pGen->pEnd = &pGen->pIn[SySetUsed(pTokenSet)];
|
|
/* Advance the stream cursor */
|
|
pGen->pRawIn++;
|
|
/* TICKET 1433-011 */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_EQUAL)) {
|
|
static const sxu32 nKeyID = PH7_TKWRD_ECHO;
|
|
sxi32 rc;
|
|
/* Refer to TICKET 1433-009 */
|
|
pGen->pIn->nType = PH7_TK_KEYWORD;
|
|
pGen->pIn->pUserData = SX_INT_TO_PTR(nKeyID);
|
|
SyStringInitFromBuf(&pGen->pIn->sData, "echo", sizeof("echo") - 1);
|
|
rc = PH7_CompileExpr(pGen, 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
goto Consume;
|
|
}
|
|
} else {
|
|
/* No more chunks to process */
|
|
pGen->pIn = pGen->pEnd;
|
|
return SXERR_EOF;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a PHP block.
|
|
* A block is simply one or more PHP statements and expressions to compile
|
|
* optionally delimited by braces {}.
|
|
* Return SXRET_OK on success. Any other return value indicates failure
|
|
* and this function takes care of generating the appropriate error
|
|
* message.
|
|
*/
|
|
static sxi32 PH7_CompileBlock(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
sxi32 nKeywordEnd /* EOF-keyword [i.e: endif;endfor;...]. 0 (zero) otherwise */
|
|
) {
|
|
sxi32 rc;
|
|
if(pGen->pIn->nType & PH7_TK_OCB /* '{' */) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_STD, PH7_VmInstrLength(pGen->pVm), 0, 0);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn++;
|
|
/* Compile until we hit the closing braces '}' */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
rc = GenStateNextChunk(&(*pGen));
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(rc == SXERR_EOF) {
|
|
/* No more token to process. Missing closing braces */
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Missing closing braces '}'");
|
|
break;
|
|
}
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_CCB/*'}'*/) {
|
|
/* Closing braces found,break immediately*/
|
|
pGen->pIn++;
|
|
break;
|
|
}
|
|
/* Compile a single statement */
|
|
rc = GenStateCompileChunk(&(*pGen), PH7_COMPILE_SINGLE_STMT);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
GenStateLeaveBlock(&(*pGen), 0);
|
|
} else if((pGen->pIn->nType & PH7_TK_COLON /* ':' */) && nKeywordEnd > 0) {
|
|
pGen->pIn++;
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_STD, PH7_VmInstrLength(pGen->pVm), 0, 0);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Compile until we hit the EOF-keyword [i.e: endif;endfor;...] */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
rc = GenStateNextChunk(&(*pGen));
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(rc == SXERR_EOF || pGen->pIn >= pGen->pEnd) {
|
|
/* No more token to process */
|
|
if(rc == SXERR_EOF) {
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pEnd[-1].nLine,
|
|
"Missing 'endfor;','endwhile;','endswitch;' or 'endforeach;' keyword");
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_KEYWORD) {
|
|
sxi32 nKwrd;
|
|
/* Keyword found */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == nKeywordEnd ||
|
|
(nKeywordEnd == PH7_TKWRD_ENDIF && (nKwrd == PH7_TKWRD_ELSE || nKwrd == PH7_TKWRD_ELIF))) {
|
|
/* Delimiter keyword found,break */
|
|
if(nKwrd != PH7_TKWRD_ELSE && nKwrd != PH7_TKWRD_ELIF) {
|
|
pGen->pIn++; /* endif;endswitch... */
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/* Compile a single statement */
|
|
rc = GenStateCompileChunk(&(*pGen), PH7_COMPILE_SINGLE_STMT);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
GenStateLeaveBlock(&(*pGen), 0);
|
|
} else {
|
|
/* Compile a single statement */
|
|
rc = GenStateCompileChunk(&(*pGen), PH7_COMPILE_SINGLE_STMT);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Jump trailing semi-colons ';' */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI)) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the gentle 'while' statement.
|
|
* According to the PHP language reference
|
|
* while loops are the simplest type of loop in PHP.They behave just like their C counterparts.
|
|
* The basic form of a while statement is:
|
|
* while (expr)
|
|
* statement
|
|
* The meaning of a while statement is simple. It tells PHP to execute the nested statement(s)
|
|
* repeatedly, as long as the while expression evaluates to TRUE. The value of the expression
|
|
* is checked each time at the beginning of the loop, so even if this value changes during
|
|
* the execution of the nested statement(s), execution will not stop until the end of the iteration
|
|
* (each time PHP runs the statements in the loop is one iteration). Sometimes, if the while
|
|
* expression evaluates to FALSE from the very beginning, the nested statement(s) won't even be run once.
|
|
* Like with the if statement, you can group multiple statements within the same while loop by surrounding
|
|
* a group of statements with curly braces, or by using the alternate syntax:
|
|
* while (expr):
|
|
* statement
|
|
* endwhile;
|
|
*/
|
|
static sxi32 PH7_CompileWhile(ph7_gen_state *pGen) {
|
|
GenBlock *pWhileBlock = 0;
|
|
SyToken *pTmp, *pEnd = 0;
|
|
sxu32 nFalseJump;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the 'while' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '(' after 'while' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
/* Create the loop block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_LOOP, PH7_VmInstrLength(pGen->pVm), 0, &pWhileBlock);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Delimit the condition */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pGen->pIn == pEnd || pEnd >= pGen->pEnd) {
|
|
/* Empty expression */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected expression after 'while' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Swap token streams */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Update token stream */
|
|
while(pGen->pIn < pEnd) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Unexpected token '%z'", &pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn++;
|
|
}
|
|
/* Synchronize pointers */
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
/* Emit the false jump */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JZ, 0, 0, 0, &nFalseJump);
|
|
/* Save the instruction index so we can fix it later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pWhileBlock, PH7_OP_JZ, nFalseJump);
|
|
/* Compile the loop body */
|
|
rc = PH7_CompileBlock(&(*pGen), PH7_TKWRD_ENDWHILE);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Emit the unconditional jump to the start of the loop */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, pWhileBlock->nFirstInstr, 0, 0);
|
|
/* Fix all jumps now the destination is resolved */
|
|
GenStateFixJumps(pWhileBlock, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Release the loop block */
|
|
GenStateLeaveBlock(pGen, 0);
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon ';' so we can avoid
|
|
* compiling this erroneous block.
|
|
*/
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the ugly do..while() statement.
|
|
* According to the PHP language reference
|
|
* do-while loops are very similar to while loops, except the truth expression is checked
|
|
* at the end of each iteration instead of in the beginning. The main difference from regular
|
|
* while loops is that the first iteration of a do-while loop is guaranteed to run
|
|
* (the truth expression is only checked at the end of the iteration), whereas it may not
|
|
* necessarily run with a regular while loop (the truth expression is checked at the beginning
|
|
* of each iteration, if it evaluates to FALSE right from the beginning, the loop execution
|
|
* would end immediately).
|
|
* There is just one syntax for do-while loops:
|
|
* <?php
|
|
* $i = 0;
|
|
* do {
|
|
* echo $i;
|
|
* } while ($i > 0);
|
|
* ?>
|
|
*/
|
|
static sxi32 PH7_CompileDoWhile(ph7_gen_state *pGen) {
|
|
SyToken *pTmp, *pEnd = 0;
|
|
GenBlock *pDoBlock = 0;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the 'do' keyword */
|
|
pGen->pIn++;
|
|
/* Create the loop block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_LOOP, PH7_VmInstrLength(pGen->pVm), 0, &pDoBlock);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Deffer 'continue;' jumps until we compile the block */
|
|
pDoBlock->bPostContinue = TRUE;
|
|
rc = PH7_CompileBlock(&(*pGen), 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
nLine = pGen->pIn->nLine;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || pGen->pIn->nType != PH7_TK_KEYWORD ||
|
|
SX_PTR_TO_INT(pGen->pIn->pUserData) != PH7_TKWRD_WHILE) {
|
|
/* Missing 'while' statement */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Missing 'while' statement after 'do' block");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Jump the 'while' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '(' after 'while' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
/* Delimit the condition */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pGen->pIn == pEnd || pEnd >= pGen->pEnd) {
|
|
/* Empty expression */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected expression after 'while' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Fix post-continue jumps now the jump destination is resolved */
|
|
if(SySetUsed(&pDoBlock->aPostContFix) > 0) {
|
|
JumpFixup *aPost;
|
|
VmInstr *pInstr;
|
|
sxu32 nJumpDest;
|
|
sxu32 n;
|
|
aPost = (JumpFixup *)SySetBasePtr(&pDoBlock->aPostContFix);
|
|
nJumpDest = PH7_VmInstrLength(pGen->pVm);
|
|
for(n = 0 ; n < SySetUsed(&pDoBlock->aPostContFix) ; ++n) {
|
|
pInstr = PH7_VmGetInstr(pGen->pVm, aPost[n].nInstrIdx);
|
|
if(pInstr) {
|
|
/* Fix */
|
|
pInstr->iP2 = nJumpDest;
|
|
}
|
|
}
|
|
}
|
|
/* Swap token streams */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Update token stream */
|
|
while(pGen->pIn < pEnd) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Unexpected token '%z'", &pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn++;
|
|
}
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
/* Emit the true jump to the beginning of the loop */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JNZ, 0, pDoBlock->nFirstInstr, 0, 0);
|
|
/* Fix all jumps now the destination is resolved */
|
|
GenStateFixJumps(pDoBlock, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Release the loop block */
|
|
GenStateLeaveBlock(pGen, 0);
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon ';' so we can avoid
|
|
* compiling this erroneous block.
|
|
*/
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the complex and powerful 'for' statement.
|
|
* According to the PHP language reference
|
|
* for loops are the most complex loops in PHP. They behave like their C counterparts.
|
|
* The syntax of a for loop is:
|
|
* for (expr1; expr2; expr3)
|
|
* statement
|
|
* The first expression (expr1) is evaluated (executed) once unconditionally at
|
|
* the beginning of the loop.
|
|
* In the beginning of each iteration, expr2 is evaluated. If it evaluates to
|
|
* TRUE, the loop continues and the nested statement(s) are executed. If it evaluates
|
|
* to FALSE, the execution of the loop ends.
|
|
* At the end of each iteration, expr3 is evaluated (executed).
|
|
* Each of the expressions can be empty or contain multiple expressions separated by commas.
|
|
* In expr2, all expressions separated by a comma are evaluated but the result is taken
|
|
* from the last part. expr2 being empty means the loop should be run indefinitely
|
|
* (PHP implicitly considers it as TRUE, like C). This may not be as useless as you might
|
|
* think, since often you'd want to end the loop using a conditional break statement instead
|
|
* of using the for truth expression.
|
|
*/
|
|
static sxi32 PH7_CompileFor(ph7_gen_state *pGen) {
|
|
SyToken *pTmp, *pPostStart, *pEnd = 0;
|
|
GenBlock *pForBlock = 0;
|
|
sxu32 nFalseJump;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the 'for' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '(' after 'for' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
/* Delimit the init-expr;condition;post-expr */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pGen->pIn == pEnd || pEnd >= pGen->pEnd) {
|
|
/* Empty expression */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "for: Invalid expression");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Synchronize */
|
|
pGen->pIn = pEnd;
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Swap token streams */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
/* Compile initialization expressions if available */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Pop operand lvalues */
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
if((pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"for: Expected ';' after initialization expressions");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Jump the trailing ';' */
|
|
pGen->pIn++;
|
|
/* Create the loop block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_LOOP, PH7_VmInstrLength(pGen->pVm), 0, &pForBlock);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Deffer continue jumps */
|
|
pForBlock->bPostContinue = TRUE;
|
|
/* Compile the condition */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
/* Emit the false jump */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JZ, 0, 0, 0, &nFalseJump);
|
|
/* Save the instruction index so we can fix it later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pForBlock, PH7_OP_JZ, nFalseJump);
|
|
}
|
|
if((pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"for: Expected ';' after conditionals expressions");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Jump the trailing ';' */
|
|
pGen->pIn++;
|
|
/* Save the post condition stream */
|
|
pPostStart = pGen->pIn;
|
|
/* Compile the loop body */
|
|
pGen->pIn = &pEnd[1]; /* Jump the trailing parenthesis ')' */
|
|
pGen->pEnd = pTmp;
|
|
rc = PH7_CompileBlock(&(*pGen), PH7_TKWRD_ENDFOR);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Fix post-continue jumps */
|
|
if(SySetUsed(&pForBlock->aPostContFix) > 0) {
|
|
JumpFixup *aPost;
|
|
VmInstr *pInstr;
|
|
sxu32 nJumpDest;
|
|
sxu32 n;
|
|
aPost = (JumpFixup *)SySetBasePtr(&pForBlock->aPostContFix);
|
|
nJumpDest = PH7_VmInstrLength(pGen->pVm);
|
|
for(n = 0 ; n < SySetUsed(&pForBlock->aPostContFix) ; ++n) {
|
|
pInstr = PH7_VmGetInstr(pGen->pVm, aPost[n].nInstrIdx);
|
|
if(pInstr) {
|
|
/* Fix jump */
|
|
pInstr->iP2 = nJumpDest;
|
|
}
|
|
}
|
|
}
|
|
/* compile the post-expressions if available */
|
|
while(pPostStart < pEnd && (pPostStart->nType & PH7_TK_SEMI)) {
|
|
pPostStart++;
|
|
}
|
|
if(pPostStart < pEnd) {
|
|
SyToken *pTmpIn, *pTmpEnd;
|
|
SWAP_DELIMITER(pGen, pPostStart, pEnd);
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "for: Expected ')' after post-expressions");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
RE_SWAP_DELIMITER(pGen);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
/* Pop operand lvalue */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
}
|
|
/* Emit the unconditional jump to the start of the loop */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, pForBlock->nFirstInstr, 0, 0);
|
|
/* Fix all jumps now the destination is resolved */
|
|
GenStateFixJumps(pForBlock, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Release the loop block */
|
|
GenStateLeaveBlock(pGen, 0);
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/* Expression tree validator callback used by the 'foreach' statement.
|
|
* Note that only variable expression [i.e: $x; ${'My'.'Var'}; ${$a['key]};...]
|
|
* are allowed.
|
|
*/
|
|
static sxi32 GenStateForEachNodeValidator(ph7_gen_state *pGen, ph7_expr_node *pRoot) {
|
|
sxi32 rc = SXRET_OK; /* Assume a valid expression tree */
|
|
if(pRoot->xCode != PH7_CompileVariable) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"foreach: Expecting a variable name");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile the 'foreach' statement.
|
|
* According to the PHP language reference
|
|
* The foreach construct simply gives an easy way to iterate over arrays. foreach works
|
|
* only on arrays (and objects), and will issue an error when you try to use it on a variable
|
|
* with a different data type or an uninitialized variable. There are two syntaxes; the second
|
|
* is a minor but useful extension of the first:
|
|
* foreach (array_expression as $value)
|
|
* statement
|
|
* foreach (array_expression as $key => $value)
|
|
* statement
|
|
* The first form loops over the array given by array_expression. On each loop, the value
|
|
* of the current element is assigned to $value and the internal array pointer is advanced
|
|
* by one (so on the next loop, you'll be looking at the next element).
|
|
* The second form does the same thing, except that the current element's key will be assigned
|
|
* to the variable $key on each loop.
|
|
* Note:
|
|
* When foreach first starts executing, the internal array pointer is automatically reset to the
|
|
* first element of the array. This means that you do not need to call reset() before a foreach loop.
|
|
* Note:
|
|
* Unless the array is referenced, foreach operates on a copy of the specified array and not the array
|
|
* itself. foreach has some side effects on the array pointer. Don't rely on the array pointer during
|
|
* or after the foreach without resetting it.
|
|
* You can easily modify array's elements by preceding $value with &. This will assign reference instead
|
|
* of copying the value.
|
|
*/
|
|
static sxi32 PH7_CompileForeach(ph7_gen_state *pGen) {
|
|
SyToken *pCur, *pTmp, *pEnd = 0;
|
|
GenBlock *pForeachBlock = 0;
|
|
ph7_foreach_info *pInfo;
|
|
sxu32 nFalseJump;
|
|
VmInstr *pInstr;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the 'foreach' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "foreach: Expected '('");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
/* Create the loop block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_LOOP, PH7_VmInstrLength(pGen->pVm), 0, &pForeachBlock);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Delimit the expression */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pGen->pIn == pEnd || pEnd >= pGen->pEnd) {
|
|
/* Empty expression */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "foreach: Missing expression");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Synchronize */
|
|
pGen->pIn = pEnd;
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Compile the array expression */
|
|
pCur = pGen->pIn;
|
|
while(pCur < pEnd) {
|
|
if(pCur->nType & PH7_TK_KEYWORD) {
|
|
sxi32 nKeywrd = SX_PTR_TO_INT(pCur->pUserData);
|
|
if(nKeywrd == PH7_TKWRD_AS) {
|
|
/* Break with the first 'as' found */
|
|
break;
|
|
}
|
|
}
|
|
/* Advance the stream cursor */
|
|
pCur++;
|
|
}
|
|
if(pCur <= pGen->pIn) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine,
|
|
"foreach: Missing array/object expression");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Swap token streams */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pCur;
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Update token stream */
|
|
while(pGen->pIn < pCur) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "foreach: Unexpected token '%z'", &pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn++;
|
|
}
|
|
pCur++; /* Jump the 'as' keyword */
|
|
pGen->pIn = pCur;
|
|
if(pGen->pIn >= pEnd) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "foreach: Missing $key => $value pair");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Create the foreach context */
|
|
pInfo = (ph7_foreach_info *)SyMemBackendAlloc(&pGen->pVm->sAllocator, sizeof(ph7_foreach_info));
|
|
if(pInfo == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Fatal, PH7 engine is running out-of-memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Zero the structure */
|
|
SyZero(pInfo, sizeof(ph7_foreach_info));
|
|
/* Initialize structure fields */
|
|
SySetInit(&pInfo->aStep, &pGen->pVm->sAllocator, sizeof(ph7_foreach_step *));
|
|
/* Check if we have a key field */
|
|
while(pCur < pEnd && (pCur->nType & PH7_TK_ARRAY_OP) == 0) {
|
|
pCur++;
|
|
}
|
|
if(pCur < pEnd) {
|
|
/* Compile the expression holding the key name */
|
|
if(pGen->pIn >= pCur) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "foreach: Missing $key");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
pGen->pEnd = pCur;
|
|
rc = PH7_CompileExpr(&(*pGen), 0, GenStateForEachNodeValidator);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
pInstr = PH7_VmPopInstr(pGen->pVm);
|
|
if(pInstr->p3) {
|
|
/* Record key name */
|
|
SyStringInitFromBuf(&pInfo->sKey, pInstr->p3, SyStrlen((const char *)pInstr->p3));
|
|
}
|
|
pInfo->iFlags |= PH7_4EACH_STEP_KEY;
|
|
}
|
|
pGen->pIn = &pCur[1]; /* Jump the arrow */
|
|
}
|
|
pGen->pEnd = pEnd;
|
|
if(pGen->pIn >= pEnd) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "foreach: Missing $value");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_AMPER /*'&'*/) {
|
|
pGen->pIn++;
|
|
/* Pass by reference */
|
|
pInfo->iFlags |= PH7_4EACH_STEP_REF;
|
|
}
|
|
/* Compile the expression holding the value name */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, GenStateForEachNodeValidator);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
pInstr = PH7_VmPopInstr(pGen->pVm);
|
|
if(pInstr->p3) {
|
|
/* Record value name */
|
|
SyStringInitFromBuf(&pInfo->sValue, pInstr->p3, SyStrlen((const char *)pInstr->p3));
|
|
}
|
|
/* Emit the 'FOREACH_INIT' instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_FOREACH_INIT, 0, 0, pInfo, &nFalseJump);
|
|
/* Save the instruction index so we can fix it later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pForeachBlock, PH7_OP_FOREACH_INIT, nFalseJump);
|
|
/* Record the first instruction to execute */
|
|
pForeachBlock->nFirstInstr = PH7_VmInstrLength(pGen->pVm);
|
|
/* Emit the FOREACH_STEP instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_FOREACH_STEP, 0, 0, pInfo, &nFalseJump);
|
|
/* Save the instruction index so we can fix it later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pForeachBlock, PH7_OP_FOREACH_STEP, nFalseJump);
|
|
/* Compile the loop body */
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
rc = PH7_CompileBlock(&(*pGen), PH7_TKWRD_END4EACH);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Emit the unconditional jump to the start of the loop */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, pForeachBlock->nFirstInstr, 0, 0);
|
|
/* Fix all jumps now the destination is resolved */
|
|
GenStateFixJumps(pForeachBlock, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Release the loop block */
|
|
GenStateLeaveBlock(pGen, 0);
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon ';' so we can avoid
|
|
* compiling this erroneous block.
|
|
*/
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the infamous if/elseif/else if/else statements.
|
|
* According to the PHP language reference
|
|
* The if construct is one of the most important features of many languages PHP included.
|
|
* It allows for conditional execution of code fragments. PHP features an if structure
|
|
* that is similar to that of C:
|
|
* if (expr)
|
|
* statement
|
|
* else construct:
|
|
* Often you'd want to execute a statement if a certain condition is met, and a different
|
|
* statement if the condition is not met. This is what else is for. else extends an if statement
|
|
* to execute a statement in case the expression in the if statement evaluates to FALSE.
|
|
* For example, the following code would display a is greater than b if $a is greater than
|
|
* $b, and a is NOT greater than b otherwise.
|
|
* The else statement is only executed if the if expression evaluated to FALSE, and if there
|
|
* were any elseif expressions - only if they evaluated to FALSE as well
|
|
* elseif
|
|
* elseif, as its name suggests, is a combination of if and else. Like else, it extends
|
|
* an if statement to execute a different statement in case the original if expression evaluates
|
|
* to FALSE. However, unlike else, it will execute that alternative expression only if the elseif
|
|
* conditional expression evaluates to TRUE. For example, the following code would display a is bigger
|
|
* than b, a equal to b or a is smaller than b:
|
|
* <?php
|
|
* if ($a > $b) {
|
|
* echo "a is bigger than b";
|
|
* } elseif ($a == $b) {
|
|
* echo "a is equal to b";
|
|
* } else {
|
|
* echo "a is smaller than b";
|
|
* }
|
|
* ?>
|
|
*/
|
|
static sxi32 PH7_CompileIf(ph7_gen_state *pGen) {
|
|
SyToken *pToken, *pTmp, *pEnd = 0;
|
|
GenBlock *pCondBlock = 0;
|
|
sxu32 nJumpIdx;
|
|
sxu32 nKeyID;
|
|
sxi32 rc;
|
|
/* Jump the 'if' keyword */
|
|
pGen->pIn++;
|
|
pToken = pGen->pIn;
|
|
/* Create the conditional block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_COND, PH7_VmInstrLength(pGen->pVm), 0, &pCondBlock);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Process as many [if/else if/elseif/else] blocks as we can */
|
|
for(;;) {
|
|
if(pToken >= pGen->pEnd || (pToken->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
if(pToken >= pGen->pEnd) {
|
|
pToken--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pToken->nLine, "if/else/elseif: Missing '('");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pToken++;
|
|
/* Delimit the condition */
|
|
PH7_DelimitNestedTokens(pToken, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pToken >= pEnd || (pEnd->nType & PH7_TK_RPAREN) == 0) {
|
|
/* Syntax error */
|
|
if(pToken >= pGen->pEnd) {
|
|
pToken--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pToken->nLine, "if/else/elseif: Missing ')'");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Swap token streams */
|
|
SWAP_TOKEN_STREAM(pGen, pToken, pEnd);
|
|
/* Compile the condition */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Update token stream */
|
|
while(pGen->pIn < pEnd) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Unexpected token '%z'", &pGen->pIn->sData);
|
|
pGen->pIn++;
|
|
}
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Emit the false jump */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JZ, 0, 0, 0, &nJumpIdx);
|
|
/* Save the instruction index so we can fix it later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pCondBlock, PH7_OP_JZ, nJumpIdx);
|
|
/* Compile the body */
|
|
rc = PH7_CompileBlock(&(*pGen), PH7_TKWRD_ENDIF);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0) {
|
|
break;
|
|
}
|
|
/* Ensure that the keyword ID is 'else if' or 'else' */
|
|
nKeyID = (sxu32)SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if((nKeyID & (PH7_TKWRD_ELSE | PH7_TKWRD_ELIF)) == 0) {
|
|
break;
|
|
}
|
|
/* Emit the unconditional jump */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, 0, 0, &nJumpIdx);
|
|
/* Save the instruction index so we can fix it later when the jump destination is resolved */
|
|
GenStateNewJumpFixup(pCondBlock, PH7_OP_JMP, nJumpIdx);
|
|
if(nKeyID & PH7_TKWRD_ELSE) {
|
|
pToken = &pGen->pIn[1];
|
|
if(pToken >= pGen->pEnd || (pToken->nType & PH7_TK_KEYWORD) == 0 ||
|
|
SX_PTR_TO_INT(pToken->pUserData) != PH7_TKWRD_IF) {
|
|
break;
|
|
}
|
|
pGen->pIn++; /* Jump the 'else' keyword */
|
|
}
|
|
pGen->pIn++; /* Jump the 'elseif/if' keyword */
|
|
/* Synchronize cursors */
|
|
pToken = pGen->pIn;
|
|
/* Fix the false jump */
|
|
GenStateFixJumps(pCondBlock, PH7_OP_JZ, PH7_VmInstrLength(pGen->pVm));
|
|
} /* For(;;) */
|
|
/* Fix the false jump */
|
|
GenStateFixJumps(pCondBlock, PH7_OP_JZ, PH7_VmInstrLength(pGen->pVm));
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD) &&
|
|
(SX_PTR_TO_INT(pGen->pIn->pUserData) & PH7_TKWRD_ELSE)) {
|
|
/* Compile the else block */
|
|
pGen->pIn++;
|
|
rc = PH7_CompileBlock(&(*pGen), PH7_TKWRD_ENDIF);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
nJumpIdx = PH7_VmInstrLength(pGen->pVm);
|
|
/* Fix all unconditional jumps now the destination is resolved */
|
|
GenStateFixJumps(pCondBlock, PH7_OP_JMP, nJumpIdx);
|
|
/* Release the conditional block */
|
|
GenStateLeaveBlock(pGen, 0);
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon ';' so we can avoid compiling this erroneous block.
|
|
*/
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the global construct.
|
|
* According to the PHP language reference
|
|
* In PHP global variables must be declared global inside a function if they are going
|
|
* to be used in that function.
|
|
* Example #1 Using global
|
|
* <?php
|
|
* $a = 1;
|
|
* $b = 2;
|
|
* function Sum()
|
|
* {
|
|
* global $a, $b;
|
|
* $b = $a + $b;
|
|
* }
|
|
* Sum();
|
|
* echo $b;
|
|
* ?>
|
|
* The above script will output 3. By declaring $a and $b global within the function
|
|
* all references to either variable will refer to the global version. There is no limit
|
|
* to the number of global variables that can be manipulated by a function.
|
|
*/
|
|
static sxi32 PH7_CompileGlobal(ph7_gen_state *pGen) {
|
|
SyToken *pTmp, *pNext = 0;
|
|
sxi32 nExpr;
|
|
sxi32 rc;
|
|
/* Jump the 'global' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_SEMI)) {
|
|
/* Nothing to process */
|
|
return SXRET_OK;
|
|
}
|
|
pTmp = pGen->pEnd;
|
|
nExpr = 0;
|
|
while(SXRET_OK == PH7_GetNextExpr(pGen->pIn, pTmp, &pNext)) {
|
|
if(pGen->pIn < pNext) {
|
|
pGen->pEnd = pNext;
|
|
if((pGen->pIn->nType & PH7_TK_DOLLAR) == 0) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "global: Expected variable name");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* Emit a warning */
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn[-1].nLine, "global: Empty variable name");
|
|
} else {
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
nExpr++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* Next expression in the stream */
|
|
pGen->pIn = pNext;
|
|
/* Jump trailing commas */
|
|
while(pGen->pIn < pTmp && (pGen->pIn->nType & PH7_TK_COMMA)) {
|
|
pGen->pIn++;
|
|
}
|
|
}
|
|
/* Restore token stream */
|
|
pGen->pEnd = pTmp;
|
|
if(nExpr > 0) {
|
|
/* Emit the uplink instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_UPLINK, nExpr, 0, 0, 0);
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the return statement.
|
|
* According to the PHP language reference
|
|
* If called from within a function, the return() statement immediately ends execution
|
|
* of the current function, and returns its argument as the value of the function call.
|
|
* return() will also end the execution of an eval() statement or script file.
|
|
* If called from the global scope, then execution of the current script file is ended.
|
|
* If the current script file was include()ed or require()ed, then control is passed back
|
|
* to the calling file. Furthermore, if the current script file was include()ed, then the value
|
|
* given to return() will be returned as the value of the include() call. If return() is called
|
|
* from within the main script file, then script execution end.
|
|
* Note that since return() is a language construct and not a function, the parentheses
|
|
* surrounding its arguments are not required. It is common to leave them out, and you actually
|
|
* should do so as PHP has less work to do in this case.
|
|
* Note: If no parameter is supplied, then the parentheses must be omitted and NULL will be returned.
|
|
*/
|
|
static sxi32 PH7_CompileReturn(ph7_gen_state *pGen) {
|
|
sxi32 nRet = 0; /* TRUE if there is a return value */
|
|
sxi32 rc;
|
|
/* Jump the 'return' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
nRet = 1;
|
|
}
|
|
}
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, nRet, 0, 0, 0);
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the die/exit language construct.
|
|
* The role of these constructs is to terminate execution of the script.
|
|
* Shutdown functions will always be executed even if exit() is called.
|
|
*/
|
|
static sxi32 PH7_CompileHalt(ph7_gen_state *pGen) {
|
|
sxi32 nExpr = 0;
|
|
sxi32 rc;
|
|
/* Jump the die/exit keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
nExpr = 1;
|
|
}
|
|
}
|
|
/* Emit the HALT instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_HALT, nExpr, 0, 0, 0);
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the 'echo' language construct.
|
|
*/
|
|
static sxi32 PH7_CompileEcho(ph7_gen_state *pGen) {
|
|
SyToken *pTmp, *pNext = 0;
|
|
sxi32 rc;
|
|
/* Jump the 'echo' keyword */
|
|
pGen->pIn++;
|
|
/* Compile arguments one after one */
|
|
pTmp = pGen->pEnd;
|
|
while(SXRET_OK == PH7_GetNextExpr(pGen->pIn, pTmp, &pNext)) {
|
|
if(pGen->pIn < pNext) {
|
|
pGen->pEnd = pNext;
|
|
rc = PH7_CompileExpr(&(*pGen), EXPR_FLAG_RDONLY_LOAD/* Do not create variable if inexistant */, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
/* Emit the consume instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_CONSUME, 1, 0, 0, 0);
|
|
}
|
|
}
|
|
/* Jump trailing commas */
|
|
while(pNext < pTmp && (pNext->nType & PH7_TK_COMMA)) {
|
|
pNext++;
|
|
}
|
|
pGen->pIn = pNext;
|
|
}
|
|
/* Restore token stream */
|
|
pGen->pEnd = pTmp;
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the static statement.
|
|
* According to the PHP language reference
|
|
* Another important feature of variable scoping is the static variable.
|
|
* A static variable exists only in a local function scope, but it does not lose its value
|
|
* when program execution leaves this scope.
|
|
* Static variables also provide one way to deal with recursive functions.
|
|
* Symisc eXtension.
|
|
* PH7 allow any complex expression to be associated with the static variable while
|
|
* the zend engine would allow only simple scalar value.
|
|
* Example
|
|
* static $myVar = "Welcome "." guest ".rand_str(3); //Valid under PH7/Generate error using the zend engine
|
|
* Refer to the official documentation for more information on this feature.
|
|
*/
|
|
static sxi32 PH7_CompileStatic(ph7_gen_state *pGen) {
|
|
ph7_vm_func_static_var sStatic; /* Structure describing the static variable */
|
|
ph7_vm_func *pFunc; /* Enclosing function */
|
|
GenBlock *pBlock;
|
|
SyString *pName;
|
|
char *zDup;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
/* Jump the static keyword */
|
|
nLine = pGen->pIn->nLine;
|
|
pGen->pIn++;
|
|
/* Extract the enclosing function if any */
|
|
pBlock = pGen->pCurrent;
|
|
while(pBlock) {
|
|
if(pBlock->iFlags & GEN_BLOCK_FUNC) {
|
|
break;
|
|
}
|
|
/* Point to the upper block */
|
|
pBlock = pBlock->pParent;
|
|
}
|
|
if(pBlock == 0) {
|
|
/* Static statement,called outside of a function body,treat it as a simple variable. */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR) == 0) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Expected variable after 'static' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Compile the expression holding the variable */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
/* Emit the POP instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
pFunc = (ph7_vm_func *)pBlock->pUserData;
|
|
/* Make sure we are dealing with a valid statement */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR) == 0 || &pGen->pIn[1] >= pGen->pEnd ||
|
|
(pGen->pIn[1].nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Expected variable after 'static' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
pGen->pIn++;
|
|
/* Extract variable name */
|
|
pName = &pGen->pIn->sData;
|
|
pGen->pIn++; /* Jump the var name */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI/*';'*/ | PH7_TK_EQUAL/*'='*/)) == 0) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "static: Unexpected token '%z'", &pGen->pIn->sData);
|
|
goto Synchronize;
|
|
}
|
|
/* Initialize the structure describing the static variable */
|
|
SySetInit(&sStatic.aByteCode, &pGen->pVm->sAllocator, sizeof(VmInstr));
|
|
sStatic.nIdx = SXU32_HIGH; /* Not yet created */
|
|
/* Duplicate variable name */
|
|
zDup = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zDup == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
SyStringInitFromBuf(&sStatic.sName, zDup, pName->nByte);
|
|
/* Check if we have an expression to compile */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_EQUAL)) {
|
|
SySet *pInstrContainer;
|
|
/* TICKET 1433-014: Symisc extension to the PHP programming language
|
|
* Static variable can take any complex expression including function
|
|
* call as their initialization value.
|
|
* Example:
|
|
* static $var = foo(1,4+5,bar());
|
|
*/
|
|
pGen->pIn++; /* Jump the equal '=' sign */
|
|
/* Swap bytecode container */
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &sStatic.aByteCode);
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, (rc != SXERR_EMPTY ? 1 : 0), 0, 0, 0);
|
|
/* Restore default bytecode container */
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
}
|
|
/* Finally save the compiled static variable in the appropriate container */
|
|
SySetPut(&pFunc->aStatic, (const void *)&sStatic);
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon ';',so we can avoid compiling this erroneous
|
|
* statement.
|
|
*/
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the var statement.
|
|
* Symisc Extension:
|
|
* var statement can be used outside of a class definition.
|
|
*/
|
|
static sxi32 PH7_CompileVar(ph7_gen_state *pGen) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
sxi32 rc;
|
|
/* Jump the 'var' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR/*'$'*/) == 0) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "var: Expecting variable name");
|
|
/* Synchronize with the first semi-colon */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc != SXERR_EMPTY) {
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a namespace statement
|
|
* According to the PHP language reference manual
|
|
* What are namespaces? In the broadest definition namespaces are a way of encapsulating items.
|
|
* This can be seen as an abstract concept in many places. For example, in any operating system
|
|
* directories serve to group related files, and act as a namespace for the files within them.
|
|
* As a concrete example, the file foo.txt can exist in both directory /home/greg and in /home/other
|
|
* but two copies of foo.txt cannot co-exist in the same directory. In addition, to access the foo.txt
|
|
* file outside of the /home/greg directory, we must prepend the directory name to the file name using
|
|
* the directory separator to get /home/greg/foo.txt. This same principle extends to namespaces in the
|
|
* programming world.
|
|
* In the PHP world, namespaces are designed to solve two problems that authors of libraries and applications
|
|
* encounter when creating re-usable code elements such as classes or functions:
|
|
* Name collisions between code you create, and internal PHP classes/functions/constants or third-party
|
|
* classes/functions/constants.
|
|
* Ability to alias (or shorten) Extra_Long_Names designed to alleviate the first problem, improving
|
|
* readability of source code.
|
|
* PHP Namespaces provide a way in which to group related classes, interfaces, functions and constants.
|
|
* Here is an example of namespace syntax in PHP:
|
|
* namespace my\name; // see "Defining Namespaces" section
|
|
* class MyClass {}
|
|
* function myfunction() {}
|
|
* const MYCONST = 1;
|
|
* $a = new MyClass;
|
|
* $c = new \my\name\MyClass;
|
|
* $a = strlen('hi');
|
|
* $d = namespace\MYCONST;
|
|
* $d = __NAMESPACE__ . '\MYCONST';
|
|
* echo constant($d);
|
|
* NOTE
|
|
* AS OF THIS VERSION NAMESPACE SUPPORT IS DISABLED. IF YOU NEED A WORKING VERSION THAT IMPLEMENT
|
|
* NAMESPACE,PLEASE CONTACT SYMISC SYSTEMS VIA contact@symisc.net.
|
|
*/
|
|
static sxi32 PH7_CompileNamespace(ph7_gen_state *pGen) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'namespace' keyword */
|
|
if(pGen->pIn >= pGen->pEnd ||
|
|
(pGen->pIn->nType & (PH7_TK_NSSEP | PH7_TK_ID | PH7_TK_KEYWORD | PH7_TK_SEMI/*';'*/ | PH7_TK_OCB/*'{'*/)) == 0) {
|
|
SyToken *pTok = pGen->pIn;
|
|
if(pTok >= pGen->pEnd) {
|
|
pTok--;
|
|
}
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Namespace: Unexpected token '%z'", &pTok->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Ignore the path */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_NSSEP/*'\'*/ | PH7_TK_ID | PH7_TK_KEYWORD))) {
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI/*';'*/ | PH7_TK_OCB/*'{'*/)) == 0) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine,
|
|
"Namespace: Unexpected token '%z',expecting ';' or '{'", &pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Emit a warning */
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, nLine,
|
|
"Namespace support is disabled in the current release of the PH7(%s) engine", ph7_lib_version());
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the 'use' statement
|
|
* According to the PHP language reference manual
|
|
* The ability to refer to an external fully qualified name with an alias or importing
|
|
* is an important feature of namespaces. This is similar to the ability of unix-based
|
|
* filesystems to create symbolic links to a file or to a directory.
|
|
* PHP namespaces support three kinds of aliasing or importing: aliasing a class name
|
|
* aliasing an interface name, and aliasing a namespace name. Note that importing
|
|
* a function or constant is not supported.
|
|
* In PHP, aliasing is accomplished with the 'use' operator.
|
|
* NOTE
|
|
* AS OF THIS VERSION NAMESPACE SUPPORT IS DISABLED. IF YOU NEED A WORKING VERSION THAT IMPLEMENT
|
|
* NAMESPACE,PLEASE CONTACT SYMISC SYSTEMS VIA contact@symisc.net.
|
|
*/
|
|
static sxi32 PH7_CompileUse(ph7_gen_state *pGen) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'use' keyword */
|
|
/* Assemeble one or more real namespace path */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
break;
|
|
}
|
|
/* Ignore the path */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_NSSEP | PH7_TK_ID))) {
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_COMMA/*','*/)) {
|
|
pGen->pIn++; /* Jump the comma and process the next path */
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD) && PH7_TKWRD_AS == SX_PTR_TO_INT(pGen->pIn->pUserData)) {
|
|
pGen->pIn++; /* Jump the 'as' keyword */
|
|
/* Compile one or more aliasses */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
break;
|
|
}
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_NSSEP | PH7_TK_ID))) {
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_COMMA/*','*/)) {
|
|
pGen->pIn++; /* Jump the comma and process the next alias */
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "use statement: Unexpected token '%z',expecting ';'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Emit a notice */
|
|
PH7_GenCompileError(&(*pGen), E_NOTICE, nLine,
|
|
"Namespace support is disabled in the current release of the PH7(%s) engine",
|
|
ph7_lib_version()
|
|
);
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Process default argument values. That is,a function may define C++-style default value
|
|
* as follows:
|
|
* function makecoffee($type = "cappuccino")
|
|
* {
|
|
* return "Making a cup of $type.\n";
|
|
* }
|
|
* Symisc eXtension.
|
|
* 1 -) Default arguments value can be any complex expression [i.e: function call,annynoymous
|
|
* functions,array member,..] unlike the zend which would allow only single scalar value.
|
|
* Example: Work only with PH7,generate error under zend
|
|
* function test($a = 'Hello'.'World: '.rand_str(3))
|
|
* {
|
|
* var_dump($a);
|
|
* }
|
|
* //call test without args
|
|
* test();
|
|
* 2 -) Full type hinting: (Arguments are automatically casted to the desired type)
|
|
* Example:
|
|
* function a(string $a){} function b(int $a,string $c,float $d){}
|
|
* 3 -) Function overloading!!
|
|
* Example:
|
|
* function foo($a) {
|
|
* return $a.PHP_EOL;
|
|
* }
|
|
* function foo($a, $b) {
|
|
* return $a + $b;
|
|
* }
|
|
* echo foo(5); // Prints "5"
|
|
* echo foo(5, 2); // Prints "7"
|
|
* // Same arg
|
|
* function foo(string $a)
|
|
* {
|
|
* echo "a is a string\n";
|
|
* var_dump($a);
|
|
* }
|
|
* function foo(int $a)
|
|
* {
|
|
* echo "a is integer\n";
|
|
* var_dump($a);
|
|
* }
|
|
* function foo(array $a)
|
|
* {
|
|
* echo "a is an array\n";
|
|
* var_dump($a);
|
|
* }
|
|
* foo('This is a great feature'); // a is a string [first foo]
|
|
* foo(52); // a is integer [second foo]
|
|
* foo(array(14,__TIME__,__DATE__)); // a is an array [third foo]
|
|
* Please refer to the official documentation for more information on the powerful extension
|
|
* introduced by the PH7 engine.
|
|
*/
|
|
static sxi32 GenStateProcessArgValue(ph7_gen_state *pGen, ph7_vm_func_arg *pArg, SyToken *pIn, SyToken *pEnd) {
|
|
SyToken *pTmpIn, *pTmpEnd;
|
|
SySet *pInstrContainer;
|
|
sxi32 rc;
|
|
/* Swap token stream */
|
|
SWAP_DELIMITER(pGen, pIn, pEnd);
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &pArg->aByteCode);
|
|
/* Compile the expression holding the argument value */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, (rc != SXERR_EMPTY ? 1 : 0), 0, 0, 0);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
RE_SWAP_DELIMITER(pGen);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Collect function arguments one after one.
|
|
* According to the PHP language reference manual.
|
|
* Information may be passed to functions via the argument list, which is a comma-delimited
|
|
* list of expressions.
|
|
* PHP supports passing arguments by value (the default), passing by reference
|
|
* and default argument values. Variable-length argument lists are also supported,
|
|
* see also the function references for func_num_args(), func_get_arg(), and func_get_args()
|
|
* for more information.
|
|
* Example #1 Passing arrays to functions
|
|
* <?php
|
|
* function takes_array($input)
|
|
* {
|
|
* echo "$input[0] + $input[1] = ", $input[0]+$input[1];
|
|
* }
|
|
* ?>
|
|
* Making arguments be passed by reference
|
|
* By default, function arguments are passed by value (so that if the value of the argument
|
|
* within the function is changed, it does not get changed outside of the function).
|
|
* To allow a function to modify its arguments, they must be passed by reference.
|
|
* To have an argument to a function always passed by reference, prepend an ampersand (&)
|
|
* to the argument name in the function definition:
|
|
* Example #2 Passing function parameters by reference
|
|
* <?php
|
|
* function add_some_extra(&$string)
|
|
* {
|
|
* $string .= 'and something extra.';
|
|
* }
|
|
* $str = 'This is a string, ';
|
|
* add_some_extra($str);
|
|
* echo $str; // outputs 'This is a string, and something extra.'
|
|
* ?>
|
|
*
|
|
* PH7 have introduced powerful extension including full type hinting,function overloading
|
|
* complex agrument values.Please refer to the official documentation for more information
|
|
* on these extension.
|
|
*/
|
|
static sxi32 GenStateCollectFuncArgs(ph7_vm_func *pFunc, ph7_gen_state *pGen, SyToken *pEnd) {
|
|
ph7_vm_func_arg sArg; /* Current processed argument */
|
|
SyToken *pCur, *pIn; /* Token stream */
|
|
SyBlob sSig; /* Function signature */
|
|
char *zDup; /* Copy of argument name */
|
|
sxi32 rc;
|
|
pIn = pGen->pIn;
|
|
pCur = 0;
|
|
SyBlobInit(&sSig, &pGen->pVm->sAllocator);
|
|
/* Process arguments one after one */
|
|
for(;;) {
|
|
if(pIn >= pEnd) {
|
|
/* No more arguments to process */
|
|
break;
|
|
}
|
|
SyZero(&sArg, sizeof(ph7_vm_func_arg));
|
|
SySetInit(&sArg.aByteCode, &pGen->pVm->sAllocator, sizeof(VmInstr));
|
|
if(pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD)) {
|
|
if(pIn->nType & PH7_TK_KEYWORD) {
|
|
sxu32 nKey = (sxu32)(SX_PTR_TO_INT(pIn->pUserData));
|
|
if(nKey & PH7_TKWRD_ARRAY) {
|
|
sArg.nType = MEMOBJ_HASHMAP;
|
|
} else if(nKey & PH7_TKWRD_BOOL) {
|
|
sArg.nType = MEMOBJ_BOOL;
|
|
} else if(nKey & PH7_TKWRD_INT) {
|
|
sArg.nType = MEMOBJ_INT;
|
|
} else if(nKey & PH7_TKWRD_STRING) {
|
|
sArg.nType = MEMOBJ_STRING;
|
|
} else if(nKey & PH7_TKWRD_FLOAT) {
|
|
sArg.nType = MEMOBJ_REAL;
|
|
} else {
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn->nLine,
|
|
"Invalid argument type '%z',Automatic cast will not be performed",
|
|
&pIn->sData);
|
|
}
|
|
} else {
|
|
SyString *pName = &pIn->sData; /* Class name */
|
|
char *zDup;
|
|
/* Argument must be a class instance,record that*/
|
|
zDup = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zDup) {
|
|
sArg.nType = SXU32_HIGH; /* 0xFFFFFFFF as sentinel */
|
|
SyStringInitFromBuf(&sArg.sClass, zDup, pName->nByte);
|
|
}
|
|
}
|
|
pIn++;
|
|
}
|
|
if(pIn >= pEnd) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Missing argument name");
|
|
return rc;
|
|
}
|
|
if(pIn->nType & PH7_TK_AMPER) {
|
|
/* Pass by reference,record that */
|
|
sArg.iFlags = VM_FUNC_ARG_BY_REF;
|
|
pIn++;
|
|
}
|
|
if(pIn >= pEnd || (pIn->nType & PH7_TK_DOLLAR) == 0 || &pIn[1] >= pEnd || (pIn[1].nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
/* Invalid argument */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Invalid argument name");
|
|
return rc;
|
|
}
|
|
pIn++; /* Jump the dollar sign */
|
|
/* Copy argument name */
|
|
zDup = SyMemBackendStrDup(&pGen->pVm->sAllocator, SyStringData(&pIn->sData), SyStringLength(&pIn->sData));
|
|
if(zDup == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, pIn->nLine, "PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
SyStringInitFromBuf(&sArg.sName, zDup, SyStringLength(&pIn->sData));
|
|
pIn++;
|
|
if(pIn < pEnd) {
|
|
if(pIn->nType & PH7_TK_EQUAL) {
|
|
SyToken *pDefend;
|
|
sxi32 iNest = 0;
|
|
pIn++; /* Jump the equal sign */
|
|
pDefend = pIn;
|
|
/* Process the default value associated with this argument */
|
|
while(pDefend < pEnd) {
|
|
if((pDefend->nType & PH7_TK_COMMA) && iNest <= 0) {
|
|
break;
|
|
}
|
|
if(pDefend->nType & (PH7_TK_LPAREN/*'('*/ | PH7_TK_OCB/*'{'*/ | PH7_TK_OSB/*[*/)) {
|
|
/* Increment nesting level */
|
|
iNest++;
|
|
} else if(pDefend->nType & (PH7_TK_RPAREN/*')'*/ | PH7_TK_CCB/*'}'*/ | PH7_TK_CSB/*]*/)) {
|
|
/* Decrement nesting level */
|
|
iNest--;
|
|
}
|
|
pDefend++;
|
|
}
|
|
if(pIn >= pDefend) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pIn->nLine, "Missing argument default value");
|
|
return rc;
|
|
}
|
|
/* Process default value */
|
|
rc = GenStateProcessArgValue(&(*pGen), &sArg, pIn, pDefend);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
/* Point beyond the default value */
|
|
pIn = pDefend;
|
|
}
|
|
if(pIn < pEnd && (pIn->nType & PH7_TK_COMMA) == 0) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pIn->nLine, "Unexpected token '%z'", &pIn->sData);
|
|
return rc;
|
|
}
|
|
pIn++; /* Jump the trailing comma */
|
|
}
|
|
/* Append argument signature */
|
|
if(sArg.nType > 0) {
|
|
if(SyStringLength(&sArg.sClass) > 0) {
|
|
/* Class name */
|
|
SyBlobAppend(&sSig, SyStringData(&sArg.sClass), SyStringLength(&sArg.sClass));
|
|
} else {
|
|
int c;
|
|
c = 'n'; /* cc warning */
|
|
/* Type leading character */
|
|
switch(sArg.nType) {
|
|
case MEMOBJ_HASHMAP:
|
|
/* Hashmap aka 'array' */
|
|
c = 'h';
|
|
break;
|
|
case MEMOBJ_INT:
|
|
/* Integer */
|
|
c = 'i';
|
|
break;
|
|
case MEMOBJ_BOOL:
|
|
/* Bool */
|
|
c = 'b';
|
|
break;
|
|
case MEMOBJ_REAL:
|
|
/* Float */
|
|
c = 'f';
|
|
break;
|
|
case MEMOBJ_STRING:
|
|
/* String */
|
|
c = 's';
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
SyBlobAppend(&sSig, (const void *)&c, sizeof(char));
|
|
}
|
|
} else {
|
|
/* No type is associated with this parameter which mean
|
|
* that this function is not condidate for overloading.
|
|
*/
|
|
SyBlobRelease(&sSig);
|
|
}
|
|
/* Save in the argument set */
|
|
SySetPut(&pFunc->aArgs, (const void *)&sArg);
|
|
}
|
|
if(SyBlobLength(&sSig) > 0) {
|
|
/* Save function signature */
|
|
SyStringInitFromBuf(&pFunc->sSignature, SyBlobData(&sSig), SyBlobLength(&sSig));
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile function [i.e: standard function, annonymous function or closure ] body.
|
|
* Return SXRET_OK on success. Any other return value indicates failure
|
|
* and this routine takes care of generating the appropriate error message.
|
|
*/
|
|
static sxi32 GenStateCompileFuncBody(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
ph7_vm_func *pFunc /* Function state */
|
|
) {
|
|
SySet *pInstrContainer; /* Instruction container */
|
|
GenBlock *pBlock;
|
|
sxi32 rc;
|
|
/* Attach the new function */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_PROTECTED | GEN_BLOCK_FUNC, PH7_VmInstrLength(pGen->pVm), pFunc, &pBlock);
|
|
if(rc != SXRET_OK) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, 1, "PH7 engine is running out-of-memory");
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Swap bytecode containers */
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &pFunc->aByteCode);
|
|
/* Compile the body */
|
|
PH7_CompileBlock(&(*pGen), 0);
|
|
/* Fix exception jumps now the destination is resolved */
|
|
GenStateFixJumps(pGen->pCurrent, PH7_OP_THROW, PH7_VmInstrLength(pGen->pVm));
|
|
/* Emit the final return if not yet done */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, 0, 0, 0, 0);
|
|
/* Restore the default container */
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
/* Leave function block */
|
|
GenStateLeaveBlock(&(*pGen), 0);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* All done, function body compiled */
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a PHP function whether is a Standard or Annonymous function.
|
|
* According to the PHP language reference manual.
|
|
* Function names follow the same rules as other labels in PHP. A valid function name
|
|
* starts with a letter or underscore, followed by any number of letters, numbers, or
|
|
* underscores. As a regular expression, it would be expressed thus:
|
|
* [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*.
|
|
* Functions need not be defined before they are referenced.
|
|
* All functions and classes in PHP have the global scope - they can be called outside
|
|
* a function even if they were defined inside and vice versa.
|
|
* It is possible to call recursive functions in PHP. However avoid recursive function/method
|
|
* calls with over 32-64 recursion levels.
|
|
*
|
|
* PH7 have introduced powerful extension including full type hinting, function overloading,
|
|
* complex agrument values and more. Please refer to the official documentation for more information
|
|
* on these extension.
|
|
*/
|
|
static sxi32 GenStateCompileFunc(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
SyString *pName, /* Function name. NULL otherwise */
|
|
sxi32 iFlags, /* Control flags */
|
|
int bHandleClosure, /* TRUE if we are dealing with a closure */
|
|
ph7_vm_func **ppFunc /* OUT: function state */
|
|
) {
|
|
ph7_vm_func *pFunc;
|
|
SyToken *pEnd;
|
|
sxu32 nLine;
|
|
char *zName;
|
|
sxi32 rc;
|
|
/* Extract line number */
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
/* Delimit the function signature */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pEnd >= pGen->pEnd) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Missing ')' after function '%z' signature", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn = pGen->pEnd;
|
|
return SXRET_OK;
|
|
}
|
|
/* Create the function state */
|
|
pFunc = (ph7_vm_func *)SyMemBackendPoolAlloc(&pGen->pVm->sAllocator, sizeof(ph7_vm_func));
|
|
if(pFunc == 0) {
|
|
goto OutOfMem;
|
|
}
|
|
/* function ID */
|
|
zName = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zName == 0) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
goto OutOfMem;
|
|
}
|
|
/* Initialize the function state */
|
|
PH7_VmInitFuncState(pGen->pVm, pFunc, zName, pName->nByte, iFlags, 0);
|
|
if(pGen->pIn < pEnd) {
|
|
/* Collect function arguments */
|
|
rc = GenStateCollectFuncArgs(pFunc, &(*pGen), pEnd);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Compile function body */
|
|
pGen->pIn = &pEnd[1];
|
|
if(bHandleClosure) {
|
|
ph7_vm_func_closure_env sEnv;
|
|
int got_this = 0; /* TRUE if $this have been seen */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD)
|
|
&& SX_PTR_TO_INT(pGen->pIn->pUserData) == PH7_TKWRD_USE) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
/* Closure,record environment variable */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Closure: Unexpected token. Expecting a left parenthesis '('");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
pGen->pIn++; /* Jump the left parenthesis or any other unexpected token */
|
|
/* Compile until we hit the first closing parenthesis */
|
|
while(pGen->pIn < pGen->pEnd) {
|
|
int iFlags = 0;
|
|
if(pGen->pIn->nType & PH7_TK_RPAREN) {
|
|
pGen->pIn++; /* Jump the closing parenthesis */
|
|
break;
|
|
}
|
|
nLine = pGen->pIn->nLine;
|
|
if(pGen->pIn->nType & PH7_TK_AMPER) {
|
|
/* Pass by reference,record that */
|
|
PH7_GenCompileError(pGen, E_WARNING, nLine,
|
|
"Closure: Pass by reference is disabled in the current release of the PH7 engine,PH7 is switching to pass by value"
|
|
);
|
|
iFlags = VM_FUNC_ARG_BY_REF;
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR) == 0 || &pGen->pIn[1] >= pGen->pEnd
|
|
|| (pGen->pIn[1].nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine,
|
|
"Closure: Unexpected token. Expecting a variable name");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Find the closing parenthesis */
|
|
while((pGen->pIn < pGen->pEnd) && (pGen->pIn->nType & PH7_TK_RPAREN) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
pGen->pIn++;
|
|
}
|
|
break;
|
|
/* TICKET 1433-95: No need for the else block below.*/
|
|
} else {
|
|
SyString *pName;
|
|
char *zDup;
|
|
/* Duplicate variable name */
|
|
pName = &pGen->pIn[1].sData;
|
|
zDup = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zDup) {
|
|
/* Zero the structure */
|
|
SyZero(&sEnv, sizeof(ph7_vm_func_closure_env));
|
|
sEnv.iFlags = iFlags;
|
|
PH7_MemObjInit(pGen->pVm, &sEnv.sValue);
|
|
SyStringInitFromBuf(&sEnv.sName, zDup, pName->nByte);
|
|
if(!got_this && pName->nByte == sizeof("this") - 1 &&
|
|
SyMemcmp((const void *)zDup, (const void *)"this", sizeof("this") - 1) == 0) {
|
|
got_this = 1;
|
|
}
|
|
/* Save imported variable */
|
|
SySetPut(&pFunc->aClosureEnv, (const void *)&sEnv);
|
|
} else {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
pGen->pIn += 2; /* $ + variable name or any other unexpected token */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_COMMA /*','*/)) {
|
|
/* Ignore trailing commas */
|
|
pGen->pIn++;
|
|
}
|
|
}
|
|
if(!got_this) {
|
|
/* Make the $this variable [Current processed Object (class instance)]
|
|
* available to the closure environment.
|
|
*/
|
|
SyZero(&sEnv, sizeof(ph7_vm_func_closure_env));
|
|
sEnv.iFlags = VM_FUNC_ARG_IGNORE; /* Do not install if NULL */
|
|
PH7_MemObjInit(pGen->pVm, &sEnv.sValue);
|
|
SyStringInitFromBuf(&sEnv.sName, "this", sizeof("this") - 1);
|
|
SySetPut(&pFunc->aClosureEnv, (const void *)&sEnv);
|
|
}
|
|
if(SySetUsed(&pFunc->aClosureEnv) > 0) {
|
|
/* Mark as closure */
|
|
pFunc->iFlags |= VM_FUNC_CLOSURE;
|
|
}
|
|
}
|
|
}
|
|
/* Compile the body */
|
|
rc = GenStateCompileFuncBody(&(*pGen), pFunc);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
if(ppFunc) {
|
|
*ppFunc = pFunc;
|
|
}
|
|
rc = SXRET_OK;
|
|
if((pFunc->iFlags & VM_FUNC_CLOSURE) == 0) {
|
|
/* Finally register the function */
|
|
rc = PH7_VmInstallUserFunction(pGen->pVm, pFunc, 0);
|
|
}
|
|
if(rc == SXRET_OK) {
|
|
return SXRET_OK;
|
|
}
|
|
/* Fall through if something goes wrong */
|
|
OutOfMem:
|
|
/* If the supplied memory subsystem is so sick that we are unable to allocate
|
|
* a tiny chunk of memory, there is no much we can do here.
|
|
*/
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, 1, "Fatal, PH7 engine is running out-of-memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/*
|
|
* Compile a standard PHP function.
|
|
* Refer to the block-comment above for more information.
|
|
*/
|
|
static sxi32 PH7_CompileFunction(ph7_gen_state *pGen) {
|
|
SyString *pName;
|
|
sxi32 iFlags;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
pGen->pIn++; /* Jump the 'function' keyword */
|
|
iFlags = 0;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_AMPER)) {
|
|
/* Return by reference,remember that */
|
|
iFlags |= VM_FUNC_REF_RETURN;
|
|
/* Jump the '&' token */
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
/* Invalid function name */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Invalid function name");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Sychronize with the next semi-colon or braces*/
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
pName = &pGen->pIn->sData;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the function name */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '(' after function name '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Sychronize with the next semi-colon or '{' */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Compile function body */
|
|
rc = GenStateCompileFunc(&(*pGen), pName, iFlags, FALSE, 0);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Extract the visibility level associated with a given keyword.
|
|
* According to the PHP language reference manual
|
|
* Visibility:
|
|
* The visibility of a property or method can be defined by prefixing
|
|
* the declaration with the keywords public, protected or private.
|
|
* Class members declared public can be accessed everywhere.
|
|
* Members declared protected can be accessed only within the class
|
|
* itself and by inherited and parent classes. Members declared as private
|
|
* may only be accessed by the class that defines the member.
|
|
*/
|
|
static sxi32 GetProtectionLevel(sxi32 nKeyword) {
|
|
if(nKeyword == PH7_TKWRD_PRIVATE) {
|
|
return PH7_CLASS_PROT_PRIVATE;
|
|
} else if(nKeyword == PH7_TKWRD_PROTECTED) {
|
|
return PH7_CLASS_PROT_PROTECTED;
|
|
}
|
|
/* Assume public by default */
|
|
return PH7_CLASS_PROT_PUBLIC;
|
|
}
|
|
/*
|
|
* Compile a class constant.
|
|
* According to the PHP language reference manual
|
|
* Class Constants
|
|
* It is possible to define constant values on a per-class basis remaining
|
|
* the same and unchangeable. Constants differ from normal variables in that
|
|
* you don't use the $ symbol to declare or use them.
|
|
* The value must be a constant expression, not (for example) a variable,
|
|
* a property, a result of a mathematical operation, or a function call.
|
|
* It's also possible for interfaces to have constants.
|
|
* Symisc eXtension.
|
|
* PH7 allow any complex expression to be associated with the constant while
|
|
* the zend engine would allow only simple scalar value.
|
|
* Example:
|
|
* class Test{
|
|
* const MyConst = "Hello"."world: ".rand_str(3); //concatenation operation + Function call
|
|
* };
|
|
* var_dump(TEST::MyConst);
|
|
* Refer to the official documentation for more information on the powerful extension
|
|
* introduced by the PH7 engine to the OO subsystem.
|
|
*/
|
|
static sxi32 GenStateCompileClassConstant(ph7_gen_state *pGen, sxi32 iProtection, sxi32 iFlags, ph7_class *pClass) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
SySet *pInstrContainer;
|
|
ph7_class_attr *pCons;
|
|
SyString *pName;
|
|
sxi32 rc;
|
|
/* Extract visibility level */
|
|
iProtection = GetProtectionLevel(iProtection);
|
|
pGen->pIn++; /* Jump the 'const' keyword */
|
|
loop:
|
|
/* Mark as constant */
|
|
iFlags |= PH7_CLASS_ATTR_CONSTANT;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_ID) == 0) {
|
|
/* Invalid constant name */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Invalid constant name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Peek constant name */
|
|
pName = &pGen->pIn->sData;
|
|
/* Make sure the constant name isn't reserved */
|
|
if(GenStateIsReservedConstant(pName)) {
|
|
/* Reserved constant name */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Cannot redeclare a reserved constant '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_EQUAL /* '=' */) == 0) {
|
|
/* Invalid declaration */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '=' after class constant %z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
pGen->pIn++; /* Jump the equal sign */
|
|
/* Allocate a new class attribute */
|
|
pCons = PH7_NewClassAttr(pGen->pVm, pName, nLine, iProtection, iFlags);
|
|
if(pCons == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Swap bytecode container */
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &pCons->aByteCode);
|
|
/* Compile constant value.
|
|
*/
|
|
rc = PH7_CompileExpr(&(*pGen), EXPR_FLAG_COMMA_STATEMENT, 0);
|
|
if(rc == SXERR_EMPTY) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Empty constant '%z' value", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, 1, 0, 0, 0);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Don't worry about freeing memory, everything will be released shortly */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* All done,install the constant */
|
|
rc = PH7_ClassInstallAttr(pClass, pCons);
|
|
if(rc != SXRET_OK) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_COMMA /*','*/)) {
|
|
/* Multiple constants declarations [i.e: const min=-1,max = 10] */
|
|
pGen->pIn++; /* Jump the comma */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_ID) == 0) {
|
|
SyToken *pTok = pGen->pIn;
|
|
if(pTok >= pGen->pEnd) {
|
|
pTok--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z',expecting constant declaration inside class '%z'",
|
|
&pTok->sData, &pClass->sName);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
if(pGen->pIn->nType & PH7_TK_ID) {
|
|
goto loop;
|
|
}
|
|
}
|
|
}
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon */
|
|
while(pGen->pIn < pGen->pEnd && ((pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0)) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXERR_CORRUPT;
|
|
}
|
|
/*
|
|
* complie a class attribute or Properties in the PHP jargon.
|
|
* According to the PHP language reference manual
|
|
* Properties
|
|
* Class member variables are called "properties". You may also see them referred
|
|
* to using other terms such as "attributes" or "fields", but for the purposes
|
|
* of this reference we will use "properties". They are defined by using one
|
|
* of the keywords public, protected, or private, followed by a normal variable
|
|
* declaration. This declaration may include an initialization, but this initialization
|
|
* must be a constant value--that is, it must be able to be evaluated at compile time
|
|
* and must not depend on run-time information in order to be evaluated.
|
|
* Symisc eXtension.
|
|
* PH7 allow any complex expression to be associated with the attribute while
|
|
* the zend engine would allow only simple scalar value.
|
|
* Example:
|
|
* class Test{
|
|
* public static $myVar = "Hello"."world: ".rand_str(3); //concatenation operation + Function call
|
|
* };
|
|
* var_dump(TEST::myVar);
|
|
* Refer to the official documentation for more information on the powerful extension
|
|
* introduced by the PH7 engine to the OO subsystem.
|
|
*/
|
|
static sxi32 GenStateCompileClassAttr(ph7_gen_state *pGen, sxi32 iProtection, sxi32 iFlags, ph7_class *pClass) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
ph7_class_attr *pAttr;
|
|
SyString *pName;
|
|
sxi32 rc;
|
|
/* Extract visibility level */
|
|
iProtection = GetProtectionLevel(iProtection);
|
|
loop:
|
|
pGen->pIn++; /* Jump the dollar sign */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_KEYWORD | PH7_TK_ID)) == 0) {
|
|
/* Invalid attribute name */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Invalid attribute name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Peek attribute name */
|
|
pName = &pGen->pIn->sData;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_EQUAL/*'='*/ | PH7_TK_SEMI/*';'*/ | PH7_TK_COMMA/*','*/)) == 0) {
|
|
/* Invalid declaration */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '=' or ';' after attribute name '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Allocate a new class attribute */
|
|
pAttr = PH7_NewClassAttr(pGen->pVm, pName, nLine, iProtection, iFlags);
|
|
if(pAttr == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_EQUAL /*'='*/) {
|
|
SySet *pInstrContainer;
|
|
pGen->pIn++; /*Jump the equal sign */
|
|
/* Swap bytecode container */
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &pAttr->aByteCode);
|
|
/* Compile attribute value.
|
|
*/
|
|
rc = PH7_CompileExpr(&(*pGen), EXPR_FLAG_COMMA_STATEMENT, 0);
|
|
if(rc == SXERR_EMPTY) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Attribute '%z': Missing default value", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, 1, 0, 0, 0);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
}
|
|
/* All done,install the attribute */
|
|
rc = PH7_ClassInstallAttr(pClass, pAttr);
|
|
if(rc != SXRET_OK) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_COMMA /*','*/)) {
|
|
/* Multiple attribute declarations [i.e: public $var1,$var2=5<<1,$var3] */
|
|
pGen->pIn++; /* Jump the comma */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR/*'$'*/) == 0) {
|
|
SyToken *pTok = pGen->pIn;
|
|
if(pTok >= pGen->pEnd) {
|
|
pTok--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z',expecting attribute declaration inside class '%z'",
|
|
&pTok->sData, &pClass->sName);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
if(pGen->pIn->nType & PH7_TK_DOLLAR) {
|
|
goto loop;
|
|
}
|
|
}
|
|
}
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon */
|
|
while(pGen->pIn < pGen->pEnd && ((pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0)) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXERR_CORRUPT;
|
|
}
|
|
/*
|
|
* Compile a class method.
|
|
*
|
|
* Refer to the official documentation for more information
|
|
* on the powerful extension introduced by the PH7 engine
|
|
* to the OO subsystem such as full type hinting,method
|
|
* overloading and many more.
|
|
*/
|
|
static sxi32 GenStateCompileClassMethod(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
sxi32 iProtection, /* Visibility level */
|
|
sxi32 iFlags, /* Configuration flags */
|
|
int doBody, /* TRUE to process method body */
|
|
ph7_class *pClass /* Class this method belongs */
|
|
) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
ph7_class_method *pMeth;
|
|
sxi32 iFuncFlags;
|
|
SyString *pName;
|
|
SyToken *pEnd;
|
|
sxi32 rc;
|
|
/* Extract visibility level */
|
|
iProtection = GetProtectionLevel(iProtection);
|
|
pGen->pIn++; /* Jump the 'function' keyword */
|
|
iFuncFlags = 0;
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* Invalid method name */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Invalid method name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_AMPER)) {
|
|
/* Return by reference,remember that */
|
|
iFuncFlags |= VM_FUNC_REF_RETURN;
|
|
/* Jump the '&' token */
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_ID)) == 0) {
|
|
/* Invalid method name */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Invalid method name");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Peek method name */
|
|
pName = &pGen->pIn->sData;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the method name */
|
|
pGen->pIn++;
|
|
if(iFlags & PH7_CLASS_ATTR_ABSTRACT) {
|
|
/* Abstract method */
|
|
if(iProtection == PH7_CLASS_PROT_PRIVATE) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine,
|
|
"Access type for abstract method '%z::%z' cannot be 'private'",
|
|
&pClass->sName, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Assemble method signature only */
|
|
doBody = FALSE;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '(' after method name '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Allocate a new class_method instance */
|
|
pMeth = PH7_NewClassMethod(pGen->pVm, pClass, pName, nLine, iProtection, iFlags, iFuncFlags);
|
|
if(pMeth == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
pEnd = 0; /* cc warning */
|
|
/* Delimit the method signature */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pEnd >= pGen->pEnd) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Missing ')' after method '%z' declaration", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
if(pGen->pIn < pEnd) {
|
|
/* Collect method arguments */
|
|
rc = GenStateCollectFuncArgs(&pMeth->sFunc, &(*pGen), pEnd);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Point beyond method signature */
|
|
pGen->pIn = &pEnd[1];
|
|
if(doBody) {
|
|
/* Compile method body */
|
|
rc = GenStateCompileFuncBody(&(*pGen), &pMeth->sFunc);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
/* Only method signature is allowed */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI /* ';'*/) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Expected ';' after method signature '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXERR_CORRUPT;
|
|
}
|
|
}
|
|
/* All done,install the method */
|
|
rc = PH7_ClassInstallMethod(pClass, pMeth);
|
|
if(rc != SXRET_OK) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon */
|
|
while(pGen->pIn < pGen->pEnd && ((pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0)) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXERR_CORRUPT;
|
|
}
|
|
/*
|
|
* Compile an object interface.
|
|
* According to the PHP language reference manual
|
|
* Object Interfaces:
|
|
* Object interfaces allow you to create code which specifies which methods
|
|
* a class must implement, without having to define how these methods are handled.
|
|
* Interfaces are defined using the interface keyword, in the same way as a standard
|
|
* class, but without any of the methods having their contents defined.
|
|
* All methods declared in an interface must be public, this is the nature of an interface.
|
|
*/
|
|
static sxi32 PH7_CompileClassInterface(ph7_gen_state *pGen) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
ph7_class *pClass, *pBase;
|
|
SyToken *pEnd, *pTmp;
|
|
SyString *pName;
|
|
sxi32 nKwrd;
|
|
sxi32 rc;
|
|
/* Jump the 'interface' keyword */
|
|
pGen->pIn++;
|
|
/* Extract interface name */
|
|
pName = &pGen->pIn->sData;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
/* Obtain a raw class */
|
|
pClass = PH7_NewRawClass(pGen->pVm, pName, nLine);
|
|
if(pClass == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Mark as an interface */
|
|
pClass->iFlags = PH7_CLASS_INTERFACE;
|
|
/* Assume no base class is given */
|
|
pBase = 0;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_EXTENDS /* interface b extends a */) {
|
|
SyString *pBaseName;
|
|
/* Extract base interface */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_ID) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine,
|
|
"Expected 'interface_name' after 'extends' keyword inside interface '%z'",
|
|
pName);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pClass);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
pBaseName = &pGen->pIn->sData;
|
|
pBase = PH7_VmExtractClass(pGen->pVm, pBaseName->zString, pBaseName->nByte, FALSE, 0);
|
|
/* Only interfaces is allowed */
|
|
while(pBase && (pBase->iFlags & PH7_CLASS_INTERFACE) == 0) {
|
|
pBase = pBase->pNextName;
|
|
}
|
|
if(pBase == 0) {
|
|
/* Inexistant interface */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Inexistant base interface '%z'", pBaseName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
}
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_OCB /*'{'*/) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '{' after interface '%z' definition", pName);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pClass);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
pGen->pIn++; /* Jump the leading curly brace */
|
|
pEnd = 0; /* cc warning */
|
|
/* Delimit the interface body */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_OCB/*'{'*/, PH7_TK_CCB/*'}'*/, &pEnd);
|
|
if(pEnd >= pGen->pEnd) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Missing '}' after interface '%z' definition", pName);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pClass);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Swap token stream */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
/* Start the parse process
|
|
* Note (According to the PHP reference manual):
|
|
* Only constants and function signatures(without body) are allowed.
|
|
* Only 'public' visibility is allowed.
|
|
*/
|
|
for(;;) {
|
|
/* Jump leading/trailing semi-colons */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI/*';'*/)) {
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* End of interface body */
|
|
break;
|
|
}
|
|
if((pGen->pIn->nType & PH7_TK_KEYWORD) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z'.Expecting method signature or constant declaration inside interface '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
/* Extract the current keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_PRIVATE || nKwrd == PH7_TKWRD_PROTECTED) {
|
|
/* Emit a warning and switch to public visibility */
|
|
PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn->nLine, "interface: Access type must be public");
|
|
nKwrd = PH7_TKWRD_PUBLIC;
|
|
}
|
|
if(nKwrd != PH7_TKWRD_PUBLIC && nKwrd != PH7_TKWRD_FUNCTION && nKwrd != PH7_TKWRD_CONST && nKwrd != PH7_TKWRD_STATIC) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Expecting method signature or constant declaration inside interface '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
if(nKwrd == PH7_TKWRD_PUBLIC) {
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Expecting method signature inside interface '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd != PH7_TKWRD_FUNCTION && nKwrd != PH7_TKWRD_CONST && nKwrd != PH7_TKWRD_STATIC) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Expecting method signature or constant declaration inside interface '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
if(nKwrd == PH7_TKWRD_CONST) {
|
|
/* Parse constant */
|
|
rc = GenStateCompileClassConstant(&(*pGen), 0, 0, pClass);
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
} else {
|
|
sxi32 iFlags = 0;
|
|
if(nKwrd == PH7_TKWRD_STATIC) {
|
|
/* Static method,record that */
|
|
iFlags |= PH7_CLASS_ATTR_STATIC;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0
|
|
|| SX_PTR_TO_INT(pGen->pIn->pUserData) != PH7_TKWRD_FUNCTION) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Expecting method signature inside interface '%z'", pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
/* Process method signature */
|
|
rc = GenStateCompileClassMethod(&(*pGen), 0, FALSE/* Only method signature*/, iFlags, pClass);
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
/* Install the interface */
|
|
rc = PH7_VmInstallClass(pGen->pVm, pClass);
|
|
if(rc == SXRET_OK && pBase) {
|
|
/* Inherit from the base interface */
|
|
rc = PH7_ClassInterfaceInherit(pClass, pBase);
|
|
}
|
|
if(rc != SXRET_OK) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
done:
|
|
/* Point beyond the interface body */
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
return PH7_OK;
|
|
}
|
|
/*
|
|
* Compile a user-defined class.
|
|
* According to the PHP language reference manual
|
|
* class
|
|
* Basic class definitions begin with the keyword class, followed by a class
|
|
* name, followed by a pair of curly braces which enclose the definitions
|
|
* of the properties and methods belonging to the class.
|
|
* The class name can be any valid label which is a not a PHP reserved word.
|
|
* A valid class name starts with a letter or underscore, followed by any number
|
|
* of letters, numbers, or underscores. As a regular expression, it would be expressed
|
|
* thus: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*.
|
|
* A class may contain its own constants, variables (called "properties"), and functions
|
|
* (called "methods").
|
|
*/
|
|
static sxi32 GenStateCompileClass(ph7_gen_state *pGen, sxi32 iFlags) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
ph7_class *pClass, *pBase;
|
|
SyToken *pEnd, *pTmp;
|
|
sxi32 iProtection;
|
|
SySet aInterfaces;
|
|
sxi32 iAttrflags;
|
|
SyString *pName;
|
|
sxi32 nKwrd;
|
|
sxi32 rc;
|
|
/* Jump the 'class' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_ID) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Invalid class name");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Synchronize with the first semi-colon or curly braces */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_OCB/*'{'*/ | PH7_TK_SEMI/*';'*/)) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Extract class name */
|
|
pName = &pGen->pIn->sData;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
/* Obtain a raw class */
|
|
pClass = PH7_NewRawClass(pGen->pVm, pName, nLine);
|
|
if(pClass == 0) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* implemented interfaces container */
|
|
SySetInit(&aInterfaces, &pGen->pVm->sAllocator, sizeof(ph7_class *));
|
|
/* Assume a standalone class */
|
|
pBase = 0;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
|
|
SyString *pBaseName;
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_EXTENDS /* class b extends a */) {
|
|
pGen->pIn++; /* Advance the stream cursor */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_ID) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine,
|
|
"Expected 'class_name' after 'extends' keyword inside class '%z'",
|
|
pName);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pClass);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Extract base class name */
|
|
pBaseName = &pGen->pIn->sData;
|
|
/* Perform the query */
|
|
pBase = PH7_VmExtractClass(pGen->pVm, pBaseName->zString, pBaseName->nByte, FALSE, 0);
|
|
/* Interfaces are not allowed */
|
|
while(pBase && (pBase->iFlags & PH7_CLASS_INTERFACE)) {
|
|
pBase = pBase->pNextName;
|
|
}
|
|
if(pBase == 0) {
|
|
/* Inexistant base class */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Inexistant base class '%z'", pBaseName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
if(pBase->iFlags & PH7_CLASS_FINAL) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine,
|
|
"Class '%z' may not inherit from final class '%z'", pName, &pBase->sName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
}
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD) && SX_PTR_TO_INT(pGen->pIn->pUserData) == PH7_TKWRD_IMPLEMENTS) {
|
|
ph7_class *pInterface;
|
|
SyString *pIntName;
|
|
/* Interface implementation */
|
|
pGen->pIn++; /* Advance the stream cursor */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_ID) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine,
|
|
"Expected 'interface_name' after 'implements' keyword inside class '%z' declaration",
|
|
pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
break;
|
|
}
|
|
/* Extract interface name */
|
|
pIntName = &pGen->pIn->sData;
|
|
/* Make sure the interface is already defined */
|
|
pInterface = PH7_VmExtractClass(pGen->pVm, pIntName->zString, pIntName->nByte, FALSE, 0);
|
|
/* Only interfaces are allowed */
|
|
while(pInterface && (pInterface->iFlags & PH7_CLASS_INTERFACE) == 0) {
|
|
pInterface = pInterface->pNextName;
|
|
}
|
|
if(pInterface == 0) {
|
|
/* Inexistant interface */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Inexistant base interface '%z'", pIntName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
} else {
|
|
/* Register interface */
|
|
SySetPut(&aInterfaces, (const void *)&pInterface);
|
|
}
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_COMMA) == 0) {
|
|
break;
|
|
}
|
|
pGen->pIn++;/* Jump the comma */
|
|
}
|
|
}
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_OCB /*'{'*/) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '{' after class '%z' declaration", pName);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pClass);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
pGen->pIn++; /* Jump the leading curly brace */
|
|
pEnd = 0; /* cc warning */
|
|
/* Delimit the class body */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_OCB/*'{'*/, PH7_TK_CCB/*'}'*/, &pEnd);
|
|
if(pEnd >= pGen->pEnd) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Missing closing braces'}' after class '%z' definition", pName);
|
|
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pClass);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Swap token stream */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
/* Set the inherited flags */
|
|
pClass->iFlags = iFlags;
|
|
/* Start the parse process */
|
|
for(;;) {
|
|
/* Jump leading/trailing semi-colons */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI/*';'*/)) {
|
|
pGen->pIn++;
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* End of class body */
|
|
break;
|
|
}
|
|
if((pGen->pIn->nType & (PH7_TK_KEYWORD | PH7_TK_DOLLAR)) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z'. Expecting attribute declaration inside class '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
/* Assume public visibility */
|
|
iProtection = PH7_TKWRD_PUBLIC;
|
|
iAttrflags = 0;
|
|
if(pGen->pIn->nType & PH7_TK_KEYWORD) {
|
|
/* Extract the current keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_PUBLIC || nKwrd == PH7_TKWRD_PRIVATE || nKwrd == PH7_TKWRD_PROTECTED) {
|
|
iProtection = nKwrd;
|
|
pGen->pIn++; /* Jump the visibility token */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_KEYWORD | PH7_TK_DOLLAR)) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z'. Expecting attribute declaration inside class '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_DOLLAR) {
|
|
/* Attribute declaration */
|
|
rc = GenStateCompileClassAttr(&(*pGen), iProtection, iAttrflags, pClass);
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
continue;
|
|
}
|
|
/* Extract the keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
}
|
|
if(nKwrd == PH7_TKWRD_CONST) {
|
|
/* Process constant declaration */
|
|
rc = GenStateCompileClassConstant(&(*pGen), iProtection, iAttrflags, pClass);
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
} else {
|
|
if(nKwrd == PH7_TKWRD_STATIC) {
|
|
/* Static method or attribute,record that */
|
|
iAttrflags |= PH7_CLASS_ATTR_STATIC;
|
|
pGen->pIn++; /* Jump the static keyword */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
|
|
/* Extract the keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_PUBLIC || nKwrd == PH7_TKWRD_PRIVATE || nKwrd == PH7_TKWRD_PROTECTED) {
|
|
iProtection = nKwrd;
|
|
pGen->pIn++; /* Jump the visibility token */
|
|
}
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_KEYWORD | PH7_TK_DOLLAR)) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z',Expecting method,attribute or constant declaration inside class '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_DOLLAR) {
|
|
/* Attribute declaration */
|
|
rc = GenStateCompileClassAttr(&(*pGen), iProtection, iAttrflags, pClass);
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
continue;
|
|
}
|
|
/* Extract the keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
} else if(nKwrd == PH7_TKWRD_ABSTRACT) {
|
|
/* Abstract method,record that */
|
|
iAttrflags |= PH7_CLASS_ATTR_ABSTRACT;
|
|
/* Mark the whole class as abstract */
|
|
pClass->iFlags |= PH7_CLASS_ABSTRACT;
|
|
/* Advance the stream cursor */
|
|
pGen->pIn++;
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_PUBLIC || nKwrd == PH7_TKWRD_PRIVATE || nKwrd == PH7_TKWRD_PROTECTED) {
|
|
iProtection = nKwrd;
|
|
pGen->pIn++; /* Jump the visibility token */
|
|
}
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD) &&
|
|
SX_PTR_TO_INT(pGen->pIn->pUserData) == PH7_TKWRD_STATIC) {
|
|
/* Static method */
|
|
iAttrflags |= PH7_CLASS_ATTR_STATIC;
|
|
pGen->pIn++; /* Jump the static keyword */
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0 ||
|
|
SX_PTR_TO_INT(pGen->pIn->pUserData) != PH7_TKWRD_FUNCTION) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z',Expecting method declaration after 'abstract' keyword inside class '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
nKwrd = PH7_TKWRD_FUNCTION;
|
|
} else if(nKwrd == PH7_TKWRD_FINAL) {
|
|
/* final method ,record that */
|
|
iAttrflags |= PH7_CLASS_ATTR_FINAL;
|
|
pGen->pIn++; /* Jump the final keyword */
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
|
|
/* Extract the keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_PUBLIC || nKwrd == PH7_TKWRD_PRIVATE || nKwrd == PH7_TKWRD_PROTECTED) {
|
|
iProtection = nKwrd;
|
|
pGen->pIn++; /* Jump the visibility token */
|
|
}
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_KEYWORD) &&
|
|
SX_PTR_TO_INT(pGen->pIn->pUserData) == PH7_TKWRD_STATIC) {
|
|
/* Static method */
|
|
iAttrflags |= PH7_CLASS_ATTR_STATIC;
|
|
pGen->pIn++; /* Jump the static keyword */
|
|
}
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0 ||
|
|
SX_PTR_TO_INT(pGen->pIn->pUserData) != PH7_TKWRD_FUNCTION) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z',Expecting method declaration after 'final' keyword inside class '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
nKwrd = PH7_TKWRD_FUNCTION;
|
|
}
|
|
if(nKwrd != PH7_TKWRD_FUNCTION && nKwrd != PH7_TKWRD_VAR) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Unexpected token '%z',Expecting method declaration inside class '%z'",
|
|
&pGen->pIn->sData, pName);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
if(nKwrd == PH7_TKWRD_VAR) {
|
|
pGen->pIn++; /* Jump the 'var' keyword */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR/*'$'*/) == 0) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Expecting attribute declaration after 'var' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
/* Attribute declaration */
|
|
rc = GenStateCompileClassAttr(&(*pGen), iProtection, iAttrflags, pClass);
|
|
} else {
|
|
/* Process method declaration */
|
|
rc = GenStateCompileClassMethod(&(*pGen), iProtection, iAttrflags, TRUE, pClass);
|
|
}
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
} else {
|
|
/* Attribute declaration */
|
|
rc = GenStateCompileClassAttr(&(*pGen), iProtection, iAttrflags, pClass);
|
|
if(rc != SXRET_OK) {
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
/* Install the class */
|
|
rc = PH7_VmInstallClass(pGen->pVm, pClass);
|
|
if(rc == SXRET_OK) {
|
|
ph7_class **apInterface;
|
|
sxu32 n;
|
|
if(pBase) {
|
|
/* Inherit from base class and mark as a subclass */
|
|
rc = PH7_ClassInherit(&(*pGen), pClass, pBase);
|
|
}
|
|
apInterface = (ph7_class **)SySetBasePtr(&aInterfaces);
|
|
for(n = 0 ; n < SySetUsed(&aInterfaces) ; n++) {
|
|
/* Implements one or more interface */
|
|
rc = PH7_ClassImplement(pClass, apInterface[n]);
|
|
if(rc != SXRET_OK) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
SySetRelease(&aInterfaces);
|
|
if(rc != SXRET_OK) {
|
|
PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
done:
|
|
/* Point beyond the class body */
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
return PH7_OK;
|
|
}
|
|
/*
|
|
* Compile a user-defined abstract class.
|
|
* According to the PHP language reference manual
|
|
* PHP 5 introduces abstract classes and methods. Classes defined as abstract
|
|
* may not be instantiated, and any class that contains at least one abstract
|
|
* method must also be abstract. Methods defined as abstract simply declare
|
|
* the method's signature - they cannot define the implementation.
|
|
* When inheriting from an abstract class, all methods marked abstract in the parent's
|
|
* class declaration must be defined by the child; additionally, these methods must be
|
|
* defined with the same (or a less restricted) visibility. For example, if the abstract
|
|
* method is defined as protected, the function implementation must be defined as either
|
|
* protected or public, but not private. Furthermore the signatures of the methods must
|
|
* match, i.e. the type hints and the number of required arguments must be the same.
|
|
* This also applies to constructors as of PHP 5.4. Before 5.4 constructor signatures
|
|
* could differ.
|
|
*/
|
|
static sxi32 PH7_CompileAbstractClass(ph7_gen_state *pGen) {
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'abstract' keyword */
|
|
rc = GenStateCompileClass(&(*pGen), PH7_CLASS_ABSTRACT);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a user-defined final class.
|
|
* According to the PHP language reference manual
|
|
* PHP 5 introduces the final keyword, which prevents child classes from overriding
|
|
* a method by prefixing the definition with final. If the class itself is being defined
|
|
* final then it cannot be extended.
|
|
*/
|
|
static sxi32 PH7_CompileFinalClass(ph7_gen_state *pGen) {
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'final' keyword */
|
|
rc = GenStateCompileClass(&(*pGen), PH7_CLASS_FINAL);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a user-defined class.
|
|
* According to the PHP language reference manual
|
|
* Basic class definitions begin with the keyword class, followed
|
|
* by a class name, followed by a pair of curly braces which enclose
|
|
* the definitions of the properties and methods belonging to the class.
|
|
* A class may contain its own constants, variables (called "properties")
|
|
* and functions (called "methods").
|
|
*/
|
|
static sxi32 PH7_CompileClass(ph7_gen_state *pGen) {
|
|
sxi32 rc;
|
|
rc = GenStateCompileClass(&(*pGen), 0);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Exception handling.
|
|
* According to the PHP language reference manual
|
|
* An exception can be thrown, and caught ("catched") within PHP. Code may be surrounded
|
|
* in a try block, to facilitate the catching of potential exceptions. Each try must have
|
|
* at least one corresponding catch block. Multiple catch blocks can be used to catch
|
|
* different classes of exceptions. Normal execution (when no exception is thrown within
|
|
* the try block, or when a catch matching the thrown exception's class is not present)
|
|
* will continue after that last catch block defined in sequence. Exceptions can be thrown
|
|
* (or re-thrown) within a catch block.
|
|
* When an exception is thrown, code following the statement will not be executed, and PHP
|
|
* will attempt to find the first matching catch block. If an exception is not caught, a PHP
|
|
* Fatal Error will be issued with an "Uncaught Exception ..." message, unless a handler has
|
|
* been defined with set_exception_handler().
|
|
* The thrown object must be an instance of the Exception class or a subclass of Exception.
|
|
* Trying to throw an object that is not will result in a PHP Fatal Error.
|
|
*/
|
|
/*
|
|
* Expression tree validator callback associated with the 'throw' statement.
|
|
* Return SXRET_OK if the tree form a valid expression.Any other error
|
|
* indicates failure.
|
|
*/
|
|
static sxi32 GenStateThrowNodeValidator(ph7_gen_state *pGen, ph7_expr_node *pRoot) {
|
|
sxi32 rc = SXRET_OK;
|
|
if(pRoot->pOp) {
|
|
if(pRoot->pOp->iOp != EXPR_OP_SUBSCRIPT /* $a[] */ && pRoot->pOp->iOp != EXPR_OP_NEW /* new Exception() */
|
|
&& pRoot->pOp->iOp != EXPR_OP_ARROW /* -> */ && pRoot->pOp->iOp != EXPR_OP_DC /* :: */) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"throw: Expecting an exception class instance");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
} else if(pRoot->xCode != PH7_CompileVariable) {
|
|
/* Unexpected expression */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pRoot->pStart ? pRoot->pStart->nLine : 0,
|
|
"throw: Expecting an exception class instance");
|
|
if(rc != SXERR_ABORT) {
|
|
rc = SXERR_INVALID;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a 'throw' statement.
|
|
* throw: This is how you trigger an exception.
|
|
* Each "throw" block must have at least one "catch" block associated with it.
|
|
*/
|
|
static sxi32 PH7_CompileThrow(ph7_gen_state *pGen) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
GenBlock *pBlock;
|
|
sxu32 nIdx;
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'throw' keyword */
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, GenStateThrowNodeValidator);
|
|
if(rc == SXERR_EMPTY) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "throw: Expecting an exception class instance");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
pBlock = pGen->pCurrent;
|
|
/* Point to the top most function or try block and emit the forward jump */
|
|
while(pBlock->pParent) {
|
|
if(pBlock->iFlags & (GEN_BLOCK_EXCEPTION | GEN_BLOCK_FUNC)) {
|
|
break;
|
|
}
|
|
/* Point to the parent block */
|
|
pBlock = pBlock->pParent;
|
|
}
|
|
/* Emit the throw instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_THROW, 0, 0, 0, &nIdx);
|
|
/* Emit the jump */
|
|
GenStateNewJumpFixup(pBlock, PH7_OP_THROW, nIdx);
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a 'catch' block.
|
|
* Catch: A "catch" block retrieves an exception and creates
|
|
* an object containing the exception information.
|
|
*/
|
|
static sxi32 PH7_CompileCatch(ph7_gen_state *pGen, ph7_exception *pException) {
|
|
sxu32 nLine = pGen->pIn->nLine;
|
|
ph7_exception_block sCatch;
|
|
SySet *pInstrContainer;
|
|
GenBlock *pCatch;
|
|
SyToken *pToken;
|
|
SyString *pName;
|
|
char *zDup;
|
|
sxi32 rc;
|
|
pGen->pIn++; /* Jump the 'catch' keyword */
|
|
/* Zero the structure */
|
|
SyZero(&sCatch, sizeof(ph7_exception_block));
|
|
/* Initialize fields */
|
|
SySetInit(&sCatch.sByteCode, &pException->pVm->sAllocator, sizeof(VmInstr));
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0 /*(*/ ||
|
|
&pGen->pIn[1] >= pGen->pEnd || (pGen->pIn[1].nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
/* Unexpected token,break immediately */
|
|
pToken = pGen->pIn;
|
|
if(pToken >= pGen->pEnd) {
|
|
pToken--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pToken->nLine,
|
|
"Catch: Unexpected token '%z',excpecting class name", &pToken->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXERR_INVALID;
|
|
}
|
|
/* Extract the exception class */
|
|
pGen->pIn++; /* Jump the left parenthesis '(' */
|
|
/* Duplicate class name */
|
|
pName = &pGen->pIn->sData;
|
|
zDup = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zDup == 0) {
|
|
goto Mem;
|
|
}
|
|
SyStringInitFromBuf(&sCatch.sClass, zDup, pName->nByte);
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_DOLLAR) == 0 /*$*/ ||
|
|
&pGen->pIn[1] >= pGen->pEnd || (pGen->pIn[1].nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
|
|
/* Unexpected token,break immediately */
|
|
pToken = pGen->pIn;
|
|
if(pToken >= pGen->pEnd) {
|
|
pToken--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pToken->nLine,
|
|
"Catch: Unexpected token '%z',expecting variable name", &pToken->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXERR_INVALID;
|
|
}
|
|
pGen->pIn++; /* Jump the dollar sign */
|
|
/* Duplicate instance name */
|
|
pName = &pGen->pIn->sData;
|
|
zDup = SyMemBackendStrDup(&pGen->pVm->sAllocator, pName->zString, pName->nByte);
|
|
if(zDup == 0) {
|
|
goto Mem;
|
|
}
|
|
SyStringInitFromBuf(&sCatch.sThis, zDup, pName->nByte);
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_RPAREN) == 0 /*)*/) {
|
|
/* Unexpected token,break immediately */
|
|
pToken = pGen->pIn;
|
|
if(pToken >= pGen->pEnd) {
|
|
pToken--;
|
|
}
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pToken->nLine,
|
|
"Catch: Unexpected token '%z',expecting right parenthesis ')'", &pToken->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXERR_INVALID;
|
|
}
|
|
/* Compile the block */
|
|
pGen->pIn++; /* Jump the right parenthesis */
|
|
/* Create the catch block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_EXCEPTION, PH7_VmInstrLength(pGen->pVm), 0, &pCatch);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Swap bytecode container */
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &sCatch.sByteCode);
|
|
/* Compile the block */
|
|
PH7_CompileBlock(&(*pGen), 0);
|
|
/* Fix forward jumps now the destination is resolved */
|
|
GenStateFixJumps(pCatch, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Emit the DONE instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, 0, 0, 0, 0);
|
|
/* Leave the block */
|
|
GenStateLeaveBlock(&(*pGen), 0);
|
|
/* Restore the default container */
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
/* Install the catch block */
|
|
rc = SySetPut(&pException->sEntry, (const void *)&sCatch);
|
|
if(rc != SXRET_OK) {
|
|
goto Mem;
|
|
}
|
|
return SXRET_OK;
|
|
Mem:
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/*
|
|
* Compile a 'try' block.
|
|
* A function using an exception should be in a "try" block.
|
|
* If the exception does not trigger, the code will continue
|
|
* as normal. However if the exception triggers, an exception
|
|
* is "thrown".
|
|
*/
|
|
static sxi32 PH7_CompileTry(ph7_gen_state *pGen) {
|
|
ph7_exception *pException;
|
|
GenBlock *pTry;
|
|
sxu32 nJmpIdx;
|
|
sxi32 rc;
|
|
/* Create the exception container */
|
|
pException = (ph7_exception *)SyMemBackendAlloc(&pGen->pVm->sAllocator, sizeof(ph7_exception));
|
|
if(pException == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR,
|
|
pGen->pIn->nLine, "Fatal, PH7 engine is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Zero the structure */
|
|
SyZero(pException, sizeof(ph7_exception));
|
|
/* Initialize fields */
|
|
SySetInit(&pException->sEntry, &pGen->pVm->sAllocator, sizeof(ph7_exception_block));
|
|
pException->pVm = pGen->pVm;
|
|
/* Create the try block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_EXCEPTION, PH7_VmInstrLength(pGen->pVm), 0, &pTry);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Emit the 'LOAD_EXCEPTION' instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_LOAD_EXCEPTION, 0, 0, pException, &nJmpIdx);
|
|
/* Fix the jump later when the destination is resolved */
|
|
GenStateNewJumpFixup(pTry, PH7_OP_LOAD_EXCEPTION, nJmpIdx);
|
|
pGen->pIn++; /* Jump the 'try' keyword */
|
|
/* Compile the block */
|
|
rc = PH7_CompileBlock(&(*pGen), 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Fix forward jumps now the destination is resolved */
|
|
GenStateFixJumps(pTry, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Emit the 'POP_EXCEPTION' instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP_EXCEPTION, 0, 0, pException, 0);
|
|
/* Leave the block */
|
|
GenStateLeaveBlock(&(*pGen), 0);
|
|
/* Compile the catch block */
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0 ||
|
|
SX_PTR_TO_INT(pGen->pIn->pUserData) != PH7_TKWRD_CATCH) {
|
|
SyToken *pTok = pGen->pIn;
|
|
if(pTok >= pGen->pEnd) {
|
|
pTok--; /* Point back */
|
|
}
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pTok->nLine,
|
|
"Try: Unexpected token '%z',expecting 'catch' block", &pTok->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Compile one or more catch blocks */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_KEYWORD) == 0
|
|
|| SX_PTR_TO_INT(pGen->pIn->pUserData) != PH7_TKWRD_CATCH) {
|
|
/* No more blocks */
|
|
break;
|
|
}
|
|
/* Compile the catch block */
|
|
rc = PH7_CompileCatch(&(*pGen), pException);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile a switch block.
|
|
* (See block-comment below for more information)
|
|
*/
|
|
static sxi32 GenStateCompileSwitchBlock(ph7_gen_state *pGen, sxu32 iTokenDelim, sxu32 *pBlockStart) {
|
|
sxi32 rc = SXRET_OK;
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI/*';'*/ | PH7_TK_COLON/*':'*/)) == 0) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Unexpected token '%z'", &pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn++;
|
|
}
|
|
pGen->pIn++;
|
|
/* First instruction to execute in this block. */
|
|
*pBlockStart = PH7_VmInstrLength(pGen->pVm);
|
|
/* Compile the block until we hit a case/default/endswitch keyword
|
|
* or the '}' token */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* No more input to process */
|
|
break;
|
|
}
|
|
rc = SXRET_OK;
|
|
if((pGen->pIn->nType & PH7_TK_KEYWORD) == 0) {
|
|
if(pGen->pIn->nType & PH7_TK_CCB /*'}' */) {
|
|
if(iTokenDelim != PH7_TK_CCB) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Unexpected token '%z'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* FALL THROUGH */
|
|
}
|
|
rc = SXERR_EOF;
|
|
break;
|
|
}
|
|
} else {
|
|
sxi32 nKwrd;
|
|
/* Extract the keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_CASE || nKwrd == PH7_TKWRD_DEFAULT) {
|
|
break;
|
|
}
|
|
if(nKwrd == PH7_TKWRD_ENDSWITCH /* endswitch; */) {
|
|
if(iTokenDelim != PH7_TK_KEYWORD) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Unexpected token '%z'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* FALL THROUGH */
|
|
}
|
|
/* Block compiled */
|
|
break;
|
|
}
|
|
}
|
|
/* Compile block */
|
|
rc = PH7_CompileBlock(&(*pGen), 0);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a case eXpression.
|
|
* (See block-comment below for more information)
|
|
*/
|
|
static sxi32 GenStateCompileCaseExpr(ph7_gen_state *pGen, ph7_case_expr *pExpr) {
|
|
SySet *pInstrContainer;
|
|
SyToken *pEnd, *pTmp;
|
|
sxi32 iNest = 0;
|
|
sxi32 rc;
|
|
/* Delimit the expression */
|
|
pEnd = pGen->pIn;
|
|
while(pEnd < pGen->pEnd) {
|
|
if(pEnd->nType & PH7_TK_LPAREN /*(*/) {
|
|
/* Increment nesting level */
|
|
iNest++;
|
|
} else if(pEnd->nType & PH7_TK_RPAREN /*)*/) {
|
|
/* Decrement nesting level */
|
|
iNest--;
|
|
} else if(pEnd->nType & (PH7_TK_SEMI/*';'*/ | PH7_TK_COLON/*;'*/) && iNest < 1) {
|
|
break;
|
|
}
|
|
pEnd++;
|
|
}
|
|
if(pGen->pIn >= pEnd) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine, "Empty case expression");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Swap token stream */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
pInstrContainer = PH7_VmGetByteCodeContainer(pGen->pVm);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, &pExpr->aByteCode);
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
/* Emit the done instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, (rc != SXERR_EMPTY ? 1 : 0), 0, 0, 0);
|
|
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
|
|
/* Update token stream */
|
|
pGen->pIn = pEnd;
|
|
pGen->pEnd = pTmp;
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Compile the smart switch statement.
|
|
* According to the PHP language reference manual
|
|
* The switch statement is similar to a series of IF statements on the same expression.
|
|
* In many occasions, you may want to compare the same variable (or expression) with many
|
|
* different values, and execute a different piece of code depending on which value it equals to.
|
|
* This is exactly what the switch statement is for.
|
|
* Note: Note that unlike some other languages, the continue statement applies to switch and acts
|
|
* similar to break. If you have a switch inside a loop and wish to continue to the next iteration
|
|
* of the outer loop, use continue 2.
|
|
* Note that switch/case does loose comparision.
|
|
* It is important to understand how the switch statement is executed in order to avoid mistakes.
|
|
* The switch statement executes line by line (actually, statement by statement).
|
|
* In the beginning, no code is executed. Only when a case statement is found with a value that
|
|
* matches the value of the switch expression does PHP begin to execute the statements.
|
|
* PHP continues to execute the statements until the end of the switch block, or the first time
|
|
* it sees a break statement. If you don't write a break statement at the end of a case's statement list.
|
|
* In a switch statement, the condition is evaluated only once and the result is compared to each
|
|
* case statement. In an elseif statement, the condition is evaluated again. If your condition
|
|
* is more complicated than a simple compare and/or is in a tight loop, a switch may be faster.
|
|
* The statement list for a case can also be empty, which simply passes control into the statement
|
|
* list for the next case.
|
|
* The case expression may be any expression that evaluates to a simple type, that is, integer
|
|
* or floating-point numbers and strings.
|
|
*/
|
|
static sxi32 PH7_CompileSwitch(ph7_gen_state *pGen) {
|
|
GenBlock *pSwitchBlock;
|
|
SyToken *pTmp, *pEnd;
|
|
ph7_switch *pSwitch;
|
|
sxu32 nToken;
|
|
sxu32 nLine;
|
|
sxi32 rc;
|
|
nLine = pGen->pIn->nLine;
|
|
/* Jump the 'switch' keyword */
|
|
pGen->pIn++;
|
|
if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & PH7_TK_LPAREN) == 0) {
|
|
/* Syntax error */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected '(' after 'switch' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Jump the left parenthesis '(' */
|
|
pGen->pIn++;
|
|
pEnd = 0; /* cc warning */
|
|
/* Create the loop block */
|
|
rc = GenStateEnterBlock(&(*pGen), GEN_BLOCK_LOOP | GEN_BLOCK_SWITCH,
|
|
PH7_VmInstrLength(pGen->pVm), 0, &pSwitchBlock);
|
|
if(rc != SXRET_OK) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Delimit the condition */
|
|
PH7_DelimitNestedTokens(pGen->pIn, pGen->pEnd, PH7_TK_LPAREN /* '(' */, PH7_TK_RPAREN /* ')' */, &pEnd);
|
|
if(pGen->pIn == pEnd || pEnd >= pGen->pEnd) {
|
|
/* Empty expression */
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, nLine, "Expected expression after 'switch' keyword");
|
|
if(rc == SXERR_ABORT) {
|
|
/* Error count limit reached,abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
/* Swap token streams */
|
|
pTmp = pGen->pEnd;
|
|
pGen->pEnd = pEnd;
|
|
/* Compile the expression */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc == SXERR_ABORT) {
|
|
/* Expression handler request an operation abort [i.e: Out-of-memory] */
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Update token stream */
|
|
while(pGen->pIn < pEnd) {
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine,
|
|
"Switch: Unexpected token '%z'", &pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
pGen->pIn++;
|
|
}
|
|
pGen->pIn = &pEnd[1];
|
|
pGen->pEnd = pTmp;
|
|
if(pGen->pIn >= pGen->pEnd || &pGen->pIn[1] >= pGen->pEnd ||
|
|
(pGen->pIn->nType & (PH7_TK_OCB/*'{'*/ | PH7_TK_COLON/*:*/)) == 0) {
|
|
pTmp = pGen->pIn;
|
|
if(pTmp >= pGen->pEnd) {
|
|
pTmp--;
|
|
}
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pTmp->nLine, "Switch: Unexpected token '%z'", &pTmp->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
goto Synchronize;
|
|
}
|
|
/* Set the delimiter token */
|
|
if(pGen->pIn->nType & PH7_TK_COLON) {
|
|
nToken = PH7_TK_KEYWORD;
|
|
/* Stop compilation when the 'endswitch;' keyword is seen */
|
|
} else {
|
|
nToken = PH7_TK_CCB; /* '}' */
|
|
}
|
|
pGen->pIn++; /* Jump the leading curly braces/colons */
|
|
/* Create the switch blocks container */
|
|
pSwitch = (ph7_switch *)SyMemBackendAlloc(&pGen->pVm->sAllocator, sizeof(ph7_switch));
|
|
if(pSwitch == 0) {
|
|
/* Abort compilation */
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Fatal, PH7 is running out of memory");
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Zero the structure */
|
|
SyZero(pSwitch, sizeof(ph7_switch));
|
|
/* Initialize fields */
|
|
SySetInit(&pSwitch->aCaseExpr, &pGen->pVm->sAllocator, sizeof(ph7_case_expr));
|
|
/* Emit the switch instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_SWITCH, 0, 0, pSwitch, 0);
|
|
/* Compile case blocks */
|
|
for(;;) {
|
|
sxu32 nKwrd;
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* No more input to process */
|
|
break;
|
|
}
|
|
if((pGen->pIn->nType & PH7_TK_KEYWORD) == 0) {
|
|
if(nToken != PH7_TK_CCB || (pGen->pIn->nType & PH7_TK_CCB /*}*/) == 0) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Switch: Unexpected token '%z'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* FALL THROUGH */
|
|
}
|
|
/* Block compiled */
|
|
break;
|
|
}
|
|
/* Extract the keyword */
|
|
nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
if(nKwrd == PH7_TKWRD_ENDSWITCH /* endswitch; */) {
|
|
if(nToken != PH7_TK_KEYWORD) {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Switch: Unexpected token '%z'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* FALL THROUGH */
|
|
}
|
|
/* Block compiled */
|
|
break;
|
|
}
|
|
if(nKwrd == PH7_TKWRD_DEFAULT) {
|
|
/*
|
|
* Accroding to the PHP language reference manual
|
|
* A special case is the default case. This case matches anything
|
|
* that wasn't matched by the other cases.
|
|
*/
|
|
if(pSwitch->nDefault > 0) {
|
|
/* Default case already compiled */
|
|
rc = PH7_GenCompileError(&(*pGen), E_WARNING, pGen->pIn->nLine, "Switch: 'default' case already compiled");
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
pGen->pIn++; /* Jump the 'default' keyword */
|
|
/* Compile the default block */
|
|
rc = GenStateCompileSwitchBlock(pGen, nToken, &pSwitch->nDefault);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc == SXERR_EOF) {
|
|
break;
|
|
}
|
|
} else if(nKwrd == PH7_TKWRD_CASE) {
|
|
ph7_case_expr sCase;
|
|
/* Standard case block */
|
|
pGen->pIn++; /* Jump the 'case' keyword */
|
|
/* initialize the structure */
|
|
SySetInit(&sCase.aByteCode, &pGen->pVm->sAllocator, sizeof(VmInstr));
|
|
/* Compile the case expression */
|
|
rc = GenStateCompileCaseExpr(pGen, &sCase);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
/* Compile the case block */
|
|
rc = GenStateCompileSwitchBlock(pGen, nToken, &sCase.nStart);
|
|
/* Insert in the switch container */
|
|
SySetPut(&pSwitch->aCaseExpr, (const void *)&sCase);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
} else if(rc == SXERR_EOF) {
|
|
break;
|
|
}
|
|
} else {
|
|
/* Unexpected token */
|
|
rc = PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Switch: Unexpected token '%z'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
return SXERR_ABORT;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/* Fix all jumps now the destination is resolved */
|
|
pSwitch->nOut = PH7_VmInstrLength(pGen->pVm);
|
|
GenStateFixJumps(pSwitchBlock, -1, PH7_VmInstrLength(pGen->pVm));
|
|
/* Release the loop block */
|
|
GenStateLeaveBlock(pGen, 0);
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
/* Jump the trailing curly braces or the endswitch keyword*/
|
|
pGen->pIn++;
|
|
}
|
|
/* Statement successfully compiled */
|
|
return SXRET_OK;
|
|
Synchronize:
|
|
/* Synchronize with the first semi-colon */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
|
|
pGen->pIn++;
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Generate bytecode for a given expression tree.
|
|
* If something goes wrong while generating bytecode
|
|
* for the expression tree (A very unlikely scenario)
|
|
* this function takes care of generating the appropriate
|
|
* error message.
|
|
*/
|
|
static sxi32 GenStateEmitExprCode(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
ph7_expr_node *pNode, /* Root of the expression tree */
|
|
sxi32 iFlags /* Control flags */
|
|
) {
|
|
VmInstr *pInstr;
|
|
sxu32 nJmpIdx;
|
|
sxi32 iP1 = 0;
|
|
sxu32 iP2 = 0;
|
|
void *p3 = 0;
|
|
sxi32 iVmOp;
|
|
sxi32 rc;
|
|
if(pNode->xCode) {
|
|
SyToken *pTmpIn, *pTmpEnd;
|
|
/* Compile node */
|
|
SWAP_DELIMITER(pGen, pNode->pStart, pNode->pEnd);
|
|
rc = pNode->xCode(&(*pGen), iFlags);
|
|
RE_SWAP_DELIMITER(pGen);
|
|
return rc;
|
|
}
|
|
if(pNode->pOp == 0) {
|
|
PH7_GenCompileError(&(*pGen), E_ERROR, pNode->pStart->nLine,
|
|
"Invalid expression node,PH7 is aborting compilation");
|
|
return SXERR_ABORT;
|
|
}
|
|
iVmOp = pNode->pOp->iVmOp;
|
|
if(pNode->pOp->iOp == EXPR_OP_QUESTY) {
|
|
sxu32 nJz, nJmp;
|
|
/* Ternary operator require special handling */
|
|
/* Phase#1: Compile the condition */
|
|
rc = GenStateEmitExprCode(&(*pGen), pNode->pCond, iFlags);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
nJz = nJmp = 0; /* cc -O6 warning */
|
|
/* Phase#2: Emit the false jump */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JZ, 0, 0, 0, &nJz);
|
|
if(pNode->pLeft) {
|
|
/* Phase#3: Compile the 'then' expression */
|
|
rc = GenStateEmitExprCode(&(*pGen), pNode->pLeft, iFlags);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
}
|
|
/* Phase#4: Emit the unconditional jump */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JMP, 0, 0, 0, &nJmp);
|
|
/* Phase#5: Fix the false jump now the jump destination is resolved. */
|
|
pInstr = PH7_VmGetInstr(pGen->pVm, nJz);
|
|
if(pInstr) {
|
|
pInstr->iP2 = PH7_VmInstrLength(pGen->pVm);
|
|
}
|
|
/* Phase#6: Compile the 'else' expression */
|
|
if(pNode->pRight) {
|
|
rc = GenStateEmitExprCode(&(*pGen), pNode->pRight, iFlags);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
}
|
|
if(nJmp > 0) {
|
|
/* Phase#7: Fix the unconditional jump */
|
|
pInstr = PH7_VmGetInstr(pGen->pVm, nJmp);
|
|
if(pInstr) {
|
|
pInstr->iP2 = PH7_VmInstrLength(pGen->pVm);
|
|
}
|
|
}
|
|
/* All done */
|
|
return SXRET_OK;
|
|
}
|
|
/* Generate code for the left tree */
|
|
if(pNode->pLeft) {
|
|
if(iVmOp == PH7_OP_CALL) {
|
|
ph7_expr_node **apNode;
|
|
sxi32 n;
|
|
/* Recurse and generate bytecodes for function arguments */
|
|
apNode = (ph7_expr_node **)SySetBasePtr(&pNode->aNodeArgs);
|
|
/* Read-only load */
|
|
iFlags |= EXPR_FLAG_RDONLY_LOAD;
|
|
for(n = 0 ; n < (sxi32)SySetUsed(&pNode->aNodeArgs) ; ++n) {
|
|
rc = GenStateEmitExprCode(&(*pGen), apNode[n], iFlags & ~EXPR_FLAG_LOAD_IDX_STORE);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
}
|
|
/* Total number of given arguments */
|
|
iP1 = (sxi32)SySetUsed(&pNode->aNodeArgs);
|
|
/* Remove stale flags now */
|
|
iFlags &= ~EXPR_FLAG_RDONLY_LOAD;
|
|
}
|
|
rc = GenStateEmitExprCode(&(*pGen), pNode->pLeft, iFlags);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
if(iVmOp == PH7_OP_CALL) {
|
|
pInstr = PH7_VmPeekInstr(pGen->pVm);
|
|
if(pInstr) {
|
|
if(pInstr->iOp == PH7_OP_LOADC) {
|
|
/* Prevent constant expansion */
|
|
pInstr->iP1 = 0;
|
|
} else if(pInstr->iOp == PH7_OP_MEMBER /* $a->b(1,2,3) */ || pInstr->iOp == PH7_OP_NEW) {
|
|
/* Method call,flag that */
|
|
pInstr->iP2 = 1;
|
|
}
|
|
}
|
|
} else if(iVmOp == PH7_OP_LOAD_IDX) {
|
|
ph7_expr_node **apNode;
|
|
sxi32 n;
|
|
/* Recurse and generate bytecodes for array index */
|
|
apNode = (ph7_expr_node **)SySetBasePtr(&pNode->aNodeArgs);
|
|
for(n = 0 ; n < (sxi32)SySetUsed(&pNode->aNodeArgs) ; ++n) {
|
|
rc = GenStateEmitExprCode(&(*pGen), apNode[n], iFlags & ~EXPR_FLAG_LOAD_IDX_STORE);
|
|
if(rc != SXRET_OK) {
|
|
return rc;
|
|
}
|
|
}
|
|
if(SySetUsed(&pNode->aNodeArgs) > 0) {
|
|
iP1 = 1; /* Node have an index associated with it */
|
|
}
|
|
if(iFlags & EXPR_FLAG_LOAD_IDX_STORE) {
|
|
/* Create an empty entry when the desired index is not found */
|
|
iP2 = 1;
|
|
}
|
|
} else if(pNode->pOp->iOp == EXPR_OP_COMMA) {
|
|
/* POP the left node */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
}
|
|
rc = SXRET_OK;
|
|
nJmpIdx = 0;
|
|
/* Generate code for the right tree */
|
|
if(pNode->pRight) {
|
|
if(iVmOp == PH7_OP_LAND) {
|
|
/* Emit the false jump so we can short-circuit the logical and */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JZ, 1/* Keep the value on the stack */, 0, 0, &nJmpIdx);
|
|
} else if(iVmOp == PH7_OP_LOR) {
|
|
/* Emit the true jump so we can short-circuit the logical or*/
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_JNZ, 1/* Keep the value on the stack */, 0, 0, &nJmpIdx);
|
|
} else if(pNode->pOp->iPrec == 18 /* Combined binary operators [i.e: =,'.=','+=',*=' ...] precedence */) {
|
|
iFlags |= EXPR_FLAG_LOAD_IDX_STORE;
|
|
}
|
|
rc = GenStateEmitExprCode(&(*pGen), pNode->pRight, iFlags);
|
|
if(iVmOp == PH7_OP_STORE) {
|
|
pInstr = PH7_VmPeekInstr(pGen->pVm);
|
|
if(pInstr) {
|
|
if(pInstr->iOp == PH7_OP_LOAD_LIST) {
|
|
/* Hide the STORE instruction */
|
|
iVmOp = 0;
|
|
} else if(pInstr->iOp == PH7_OP_MEMBER) {
|
|
/* Perform a member store operation [i.e: $this->x = 50] */
|
|
iP2 = 1;
|
|
} else {
|
|
if(pInstr->iOp == PH7_OP_LOAD_IDX) {
|
|
/* Transform the STORE instruction to STORE_IDX instruction */
|
|
iVmOp = PH7_OP_STORE_IDX;
|
|
iP1 = pInstr->iP1;
|
|
} else {
|
|
p3 = pInstr->p3;
|
|
}
|
|
/* POP the last dynamic load instruction */
|
|
(void)PH7_VmPopInstr(pGen->pVm);
|
|
}
|
|
}
|
|
} else if(iVmOp == PH7_OP_STORE_REF) {
|
|
pInstr = PH7_VmPopInstr(pGen->pVm);
|
|
if(pInstr) {
|
|
if(pInstr->iOp == PH7_OP_LOAD_IDX) {
|
|
/* Array insertion by reference [i.e: $pArray[] =& $some_var; ]
|
|
* We have to convert the STORE_REF instruction into STORE_IDX_REF
|
|
*/
|
|
iVmOp = PH7_OP_STORE_IDX_REF;
|
|
iP1 = pInstr->iP1;
|
|
iP2 = pInstr->iP2;
|
|
p3 = pInstr->p3;
|
|
} else {
|
|
p3 = pInstr->p3;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if(iVmOp > 0) {
|
|
if(iVmOp == PH7_OP_INCR || iVmOp == PH7_OP_DECR) {
|
|
if(pNode->iFlags & EXPR_NODE_PRE_INCR) {
|
|
/* Pre-increment/decrement operator [i.e: ++$i,--$j ] */
|
|
iP1 = 1;
|
|
}
|
|
} else if(iVmOp == PH7_OP_NEW) {
|
|
pInstr = PH7_VmPeekInstr(pGen->pVm);
|
|
if(pInstr && pInstr->iOp == PH7_OP_CALL) {
|
|
VmInstr *pPrev;
|
|
pPrev = PH7_VmPeekNextInstr(pGen->pVm);
|
|
if(pPrev == 0 || pPrev->iOp != PH7_OP_MEMBER) {
|
|
/* Pop the call instruction */
|
|
iP1 = pInstr->iP1;
|
|
(void)PH7_VmPopInstr(pGen->pVm);
|
|
}
|
|
}
|
|
} else if(iVmOp == PH7_OP_MEMBER) {
|
|
if(pNode->pOp->iOp == EXPR_OP_DC /* '::' */) {
|
|
/* Static member access,remember that */
|
|
iP1 = 1;
|
|
pInstr = PH7_VmPeekInstr(pGen->pVm);
|
|
if(pInstr && pInstr->iOp == PH7_OP_LOAD) {
|
|
p3 = pInstr->p3;
|
|
(void)PH7_VmPopInstr(pGen->pVm);
|
|
}
|
|
}
|
|
}
|
|
/* Finally,emit the VM instruction associated with this operator */
|
|
PH7_VmEmitInstr(pGen->pVm, iVmOp, iP1, iP2, p3, 0);
|
|
if(nJmpIdx > 0) {
|
|
/* Fix short-circuited jumps now the destination is resolved */
|
|
pInstr = PH7_VmGetInstr(pGen->pVm, nJmpIdx);
|
|
if(pInstr) {
|
|
pInstr->iP2 = PH7_VmInstrLength(pGen->pVm);
|
|
}
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a PHP expression.
|
|
* According to the PHP language reference manual:
|
|
* Expressions are the most important building stones of PHP.
|
|
* In PHP, almost anything you write is an expression.
|
|
* The simplest yet most accurate way to define an expression
|
|
* is "anything that has a value".
|
|
* If something goes wrong while compiling the expression,this
|
|
* function takes care of generating the appropriate error
|
|
* message.
|
|
*/
|
|
static sxi32 PH7_CompileExpr(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
sxi32 iFlags, /* Control flags */
|
|
sxi32(*xTreeValidator)(ph7_gen_state *, ph7_expr_node *) /* Node validator callback.NULL otherwise */
|
|
) {
|
|
ph7_expr_node *pRoot;
|
|
SySet sExprNode;
|
|
SyToken *pEnd;
|
|
sxi32 nExpr;
|
|
sxi32 iNest;
|
|
sxi32 rc;
|
|
/* Initialize worker variables */
|
|
nExpr = 0;
|
|
pRoot = 0;
|
|
SySetInit(&sExprNode, &pGen->pVm->sAllocator, sizeof(ph7_expr_node *));
|
|
SySetAlloc(&sExprNode, 0x10);
|
|
rc = SXRET_OK;
|
|
/* Delimit the expression */
|
|
pEnd = pGen->pIn;
|
|
iNest = 0;
|
|
while(pEnd < pGen->pEnd) {
|
|
if(pEnd->nType & PH7_TK_OCB /* '{' */) {
|
|
/* Ticket 1433-30: Annonymous/Closure functions body */
|
|
iNest++;
|
|
} else if(pEnd->nType & PH7_TK_CCB /* '}' */) {
|
|
iNest--;
|
|
} else if(pEnd->nType & PH7_TK_SEMI /* ';' */) {
|
|
if(iNest <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
pEnd++;
|
|
}
|
|
if(iFlags & EXPR_FLAG_COMMA_STATEMENT) {
|
|
SyToken *pEnd2 = pGen->pIn;
|
|
iNest = 0;
|
|
/* Stop at the first comma */
|
|
while(pEnd2 < pEnd) {
|
|
if(pEnd2->nType & (PH7_TK_OCB/*'{'*/ | PH7_TK_OSB/*'['*/ | PH7_TK_LPAREN/*'('*/)) {
|
|
iNest++;
|
|
} else if(pEnd2->nType & (PH7_TK_CCB/*'}'*/ | PH7_TK_CSB/*']'*/ | PH7_TK_RPAREN/*')'*/)) {
|
|
iNest--;
|
|
} else if(pEnd2->nType & PH7_TK_COMMA /*','*/) {
|
|
if(iNest <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
pEnd2++;
|
|
}
|
|
if(pEnd2 < pEnd) {
|
|
pEnd = pEnd2;
|
|
}
|
|
}
|
|
if(pEnd > pGen->pIn) {
|
|
SyToken *pTmp = pGen->pEnd;
|
|
/* Swap delimiter */
|
|
pGen->pEnd = pEnd;
|
|
/* Try to get an expression tree */
|
|
rc = PH7_ExprMakeTree(&(*pGen), &sExprNode, &pRoot);
|
|
if(rc == SXRET_OK && pRoot) {
|
|
rc = SXRET_OK;
|
|
if(xTreeValidator) {
|
|
/* Call the upper layer validator callback */
|
|
rc = xTreeValidator(&(*pGen), pRoot);
|
|
}
|
|
if(rc != SXERR_ABORT) {
|
|
/* Generate code for the given tree */
|
|
rc = GenStateEmitExprCode(&(*pGen), pRoot, iFlags);
|
|
}
|
|
nExpr = 1;
|
|
}
|
|
/* Release the whole tree */
|
|
PH7_ExprFreeTree(&(*pGen), &sExprNode);
|
|
/* Synchronize token stream */
|
|
pGen->pEnd = pTmp;
|
|
pGen->pIn = pEnd;
|
|
if(rc == SXERR_ABORT) {
|
|
SySetRelease(&sExprNode);
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
SySetRelease(&sExprNode);
|
|
return nExpr > 0 ? SXRET_OK : SXERR_EMPTY;
|
|
}
|
|
/*
|
|
* Return a pointer to the node construct handler associated
|
|
* with a given node type [i.e: string,integer,float,...].
|
|
*/
|
|
PH7_PRIVATE ProcNodeConstruct PH7_GetNodeHandler(sxu32 nNodeType) {
|
|
if(nNodeType & PH7_TK_NUM) {
|
|
/* Numeric literal: Either real or integer */
|
|
return PH7_CompileNumLiteral;
|
|
} else if(nNodeType & PH7_TK_DSTR) {
|
|
/* Double quoted string */
|
|
return PH7_CompileString;
|
|
} else if(nNodeType & PH7_TK_SSTR) {
|
|
/* Single quoted string */
|
|
return PH7_CompileSimpleString;
|
|
} else if(nNodeType & PH7_TK_BSTR) {
|
|
/* Backtick quoted string */
|
|
return PH7_CompileBacktic;
|
|
}
|
|
return 0;
|
|
}
|
|
/*
|
|
* PHP Language construct table.
|
|
*/
|
|
static const LangConstruct aLangConstruct[] = {
|
|
{ PH7_TKWRD_ECHO, PH7_CompileEcho }, /* echo language construct */
|
|
{ PH7_TKWRD_IF, PH7_CompileIf }, /* if statement */
|
|
{ PH7_TKWRD_FOR, PH7_CompileFor }, /* for statement */
|
|
{ PH7_TKWRD_WHILE, PH7_CompileWhile }, /* while statement */
|
|
{ PH7_TKWRD_FOREACH, PH7_CompileForeach }, /* foreach statement */
|
|
{ PH7_TKWRD_FUNCTION, PH7_CompileFunction }, /* function statement */
|
|
{ PH7_TKWRD_CONTINUE, PH7_CompileContinue }, /* continue statement */
|
|
{ PH7_TKWRD_BREAK, PH7_CompileBreak }, /* break statement */
|
|
{ PH7_TKWRD_RETURN, PH7_CompileReturn }, /* return statement */
|
|
{ PH7_TKWRD_SWITCH, PH7_CompileSwitch }, /* Switch statement */
|
|
{ PH7_TKWRD_DO, PH7_CompileDoWhile }, /* do{ }while(); statement */
|
|
{ PH7_TKWRD_GLOBAL, PH7_CompileGlobal }, /* global statement */
|
|
{ PH7_TKWRD_STATIC, PH7_CompileStatic }, /* static statement */
|
|
{ PH7_TKWRD_DIE, PH7_CompileHalt }, /* die language construct */
|
|
{ PH7_TKWRD_EXIT, PH7_CompileHalt }, /* exit language construct */
|
|
{ PH7_TKWRD_TRY, PH7_CompileTry }, /* try statement */
|
|
{ PH7_TKWRD_THROW, PH7_CompileThrow }, /* throw statement */
|
|
{ PH7_TKWRD_CONST, PH7_CompileConstant }, /* const statement */
|
|
{ PH7_TKWRD_VAR, PH7_CompileVar }, /* var statement */
|
|
{ PH7_TKWRD_NAMESPACE, PH7_CompileNamespace }, /* namespace statement */
|
|
{ PH7_TKWRD_USE, PH7_CompileUse }, /* use statement */
|
|
};
|
|
/*
|
|
* Return a pointer to the statement handler routine associated
|
|
* with a given PHP keyword [i.e: if,for,while,...].
|
|
*/
|
|
static ProcLangConstruct GenStateGetStatementHandler(
|
|
sxu32 nKeywordID, /* Keyword ID*/
|
|
SyToken *pLookahed /* Look-ahead token */
|
|
) {
|
|
sxu32 n = 0;
|
|
for(;;) {
|
|
if(n >= SX_ARRAYSIZE(aLangConstruct)) {
|
|
break;
|
|
}
|
|
if(aLangConstruct[n].nID == nKeywordID) {
|
|
if(nKeywordID == PH7_TKWRD_STATIC && pLookahed && (pLookahed->nType & PH7_TK_OP)) {
|
|
const ph7_expr_op *pOp = (const ph7_expr_op *)pLookahed->pUserData;
|
|
if(pOp && pOp->iOp == EXPR_OP_DC /*::*/) {
|
|
/* 'static' (class context),return null */
|
|
return 0;
|
|
}
|
|
}
|
|
/* Return a pointer to the handler.
|
|
*/
|
|
return aLangConstruct[n].xConstruct;
|
|
}
|
|
n++;
|
|
}
|
|
if(pLookahed) {
|
|
if(nKeywordID == PH7_TKWRD_INTERFACE && (pLookahed->nType & PH7_TK_ID)) {
|
|
return PH7_CompileClassInterface;
|
|
} else if(nKeywordID == PH7_TKWRD_CLASS && (pLookahed->nType & PH7_TK_ID)) {
|
|
return PH7_CompileClass;
|
|
} else if(nKeywordID == PH7_TKWRD_ABSTRACT && (pLookahed->nType & PH7_TK_KEYWORD)
|
|
&& SX_PTR_TO_INT(pLookahed->pUserData) == PH7_TKWRD_CLASS) {
|
|
return PH7_CompileAbstractClass;
|
|
} else if(nKeywordID == PH7_TKWRD_FINAL && (pLookahed->nType & PH7_TK_KEYWORD)
|
|
&& SX_PTR_TO_INT(pLookahed->pUserData) == PH7_TKWRD_CLASS) {
|
|
return PH7_CompileFinalClass;
|
|
}
|
|
}
|
|
/* Not a language construct */
|
|
return 0;
|
|
}
|
|
/*
|
|
* Check if the given keyword is in fact a PHP language construct.
|
|
* Return TRUE on success. FALSE otheriwse.
|
|
*/
|
|
static int GenStateisLangConstruct(sxu32 nKeyword) {
|
|
int rc;
|
|
rc = PH7_IsLangConstruct(nKeyword, TRUE);
|
|
if(rc == FALSE) {
|
|
if(nKeyword == PH7_TKWRD_SELF || nKeyword == PH7_TKWRD_PARENT || nKeyword == PH7_TKWRD_STATIC
|
|
/*|| nKeyword == PH7_TKWRD_CLASS || nKeyword == PH7_TKWRD_FINAL || nKeyword == PH7_TKWRD_EXTENDS
|
|
|| nKeyword == PH7_TKWRD_ABSTRACT || nKeyword == PH7_TKWRD_INTERFACE
|
|
|| nKeyword == PH7_TKWRD_PUBLIC || nKeyword == PH7_TKWRD_PROTECTED
|
|
|| nKeyword == PH7_TKWRD_PRIVATE || nKeyword == PH7_TKWRD_IMPLEMENTS
|
|
*/
|
|
) {
|
|
rc = TRUE;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a PHP chunk.
|
|
* If something goes wrong while compiling the PHP chunk,this function
|
|
* takes care of generating the appropriate error message.
|
|
*/
|
|
static sxi32 GenStateCompileChunk(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
sxi32 iFlags /* Compile flags */
|
|
) {
|
|
ProcLangConstruct xCons;
|
|
sxi32 rc;
|
|
rc = SXRET_OK; /* Prevent compiler warning */
|
|
for(;;) {
|
|
if(pGen->pIn >= pGen->pEnd) {
|
|
/* No more input to process */
|
|
break;
|
|
}
|
|
if(pGen->pIn->nType & PH7_TK_OCB /* '{' */) {
|
|
/* Compile block */
|
|
rc = PH7_CompileBlock(&(*pGen), 0);
|
|
if(rc == SXERR_ABORT) {
|
|
break;
|
|
}
|
|
} else {
|
|
xCons = 0;
|
|
if(pGen->pIn->nType & PH7_TK_KEYWORD) {
|
|
sxu32 nKeyword = (sxu32)SX_PTR_TO_INT(pGen->pIn->pUserData);
|
|
/* Try to extract a language construct handler */
|
|
xCons = GenStateGetStatementHandler(nKeyword, (&pGen->pIn[1] < pGen->pEnd) ? &pGen->pIn[1] : 0);
|
|
if(xCons == 0 && GenStateisLangConstruct(nKeyword) == FALSE) {
|
|
rc = PH7_GenCompileError(pGen, E_ERROR, pGen->pIn->nLine,
|
|
"Syntax error: Unexpected keyword '%z'",
|
|
&pGen->pIn->sData);
|
|
if(rc == SXERR_ABORT) {
|
|
break;
|
|
}
|
|
/* Synchronize with the first semi-colon and avoid compiling
|
|
* this erroneous statement.
|
|
*/
|
|
xCons = PH7_ErrorRecover;
|
|
}
|
|
}
|
|
if(xCons == 0) {
|
|
/* Assume an expression an try to compile it */
|
|
rc = PH7_CompileExpr(&(*pGen), 0, 0);
|
|
if(rc != SXERR_EMPTY) {
|
|
/* Pop l-value */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
} else {
|
|
/* Go compile the sucker */
|
|
rc = xCons(&(*pGen));
|
|
}
|
|
if(rc == SXERR_ABORT) {
|
|
/* Request to abort compilation */
|
|
break;
|
|
}
|
|
}
|
|
/* Ignore trailing semi-colons ';' */
|
|
while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI)) {
|
|
pGen->pIn++;
|
|
}
|
|
if(iFlags & PH7_COMPILE_SINGLE_STMT) {
|
|
/* Compile a single statement and return */
|
|
break;
|
|
}
|
|
/* LOOP ONE */
|
|
/* LOOP TWO */
|
|
/* LOOP THREE */
|
|
/* LOOP FOUR */
|
|
}
|
|
/* Return compilation status */
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a Raw PHP chunk.
|
|
* If something goes wrong while compiling the PHP chunk,this function
|
|
* takes care of generating the appropriate error message.
|
|
*/
|
|
static sxi32 PH7_CompilePHP(
|
|
ph7_gen_state *pGen, /* Code generator state */
|
|
SySet *pTokenSet, /* Token set */
|
|
int is_expr /* TRUE if we are dealing with a simple expression */
|
|
) {
|
|
SyToken *pScript = pGen->pRawIn; /* Script to compile */
|
|
sxi32 rc;
|
|
/* Reset the token set */
|
|
SySetReset(&(*pTokenSet));
|
|
/* Mark as the default token set */
|
|
pGen->pTokenSet = &(*pTokenSet);
|
|
/* Advance the stream cursor */
|
|
pGen->pRawIn++;
|
|
/* Tokenize the PHP chunk first */
|
|
PH7_TokenizePHP(SyStringData(&pScript->sData), SyStringLength(&pScript->sData), pScript->nLine, &(*pTokenSet));
|
|
/* Point to the head and tail of the token stream. */
|
|
pGen->pIn = (SyToken *)SySetBasePtr(pTokenSet);
|
|
pGen->pEnd = &pGen->pIn[SySetUsed(pTokenSet)];
|
|
if(is_expr) {
|
|
rc = SXERR_EMPTY;
|
|
if(pGen->pIn < pGen->pEnd) {
|
|
/* A simple expression,compile it */
|
|
rc = PH7_CompileExpr(pGen, 0, 0);
|
|
}
|
|
/* Emit the DONE instruction */
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_DONE, (rc != SXERR_EMPTY ? 1 : 0), 0, 0, 0);
|
|
return SXRET_OK;
|
|
}
|
|
if(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_EQUAL)) {
|
|
static const sxu32 nKeyID = PH7_TKWRD_ECHO;
|
|
/*
|
|
* Shortcut syntax for the 'echo' language construct.
|
|
* According to the PHP reference manual:
|
|
* echo() also has a shortcut syntax, where you can
|
|
* immediately follow
|
|
* the opening tag with an equals sign as follows:
|
|
* <?= 4+5?> is the same as <?echo 4+5?>
|
|
* Symisc extension:
|
|
* This short syntax works with all PHP opening
|
|
* tags unlike the default PHP engine that handle
|
|
* only short tag.
|
|
*/
|
|
/* Ticket 1433-009: Emulate the 'echo' call */
|
|
pGen->pIn->nType = PH7_TK_KEYWORD;
|
|
pGen->pIn->pUserData = SX_INT_TO_PTR(nKeyID);
|
|
SyStringInitFromBuf(&pGen->pIn->sData, "echo", sizeof("echo") - 1);
|
|
rc = PH7_CompileExpr(pGen, 0, 0);
|
|
if(rc != SXERR_EMPTY) {
|
|
PH7_VmEmitInstr(pGen->pVm, PH7_OP_POP, 1, 0, 0, 0);
|
|
}
|
|
return SXRET_OK;
|
|
}
|
|
/* Compile the PHP chunk */
|
|
rc = GenStateCompileChunk(pGen, 0);
|
|
/* Fix exceptions jumps */
|
|
GenStateFixJumps(pGen->pCurrent, PH7_OP_THROW, PH7_VmInstrLength(pGen->pVm));
|
|
/* Fix gotos now, the jump destination is resolved */
|
|
/* Compilation result */
|
|
return rc;
|
|
}
|
|
/*
|
|
* Compile a raw chunk. The raw chunk can contain PHP code embedded
|
|
* in HTML, XML and so on. This function handle all the stuff.
|
|
* This is the only compile interface exported from this file.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_CompileScript(
|
|
ph7_vm *pVm, /* Generate PH7 byte-codes for this Virtual Machine */
|
|
SyString *pScript, /* Script to compile */
|
|
sxi32 iFlags /* Compile flags */
|
|
) {
|
|
SySet aPhpToken, aRawToken;
|
|
ph7_gen_state *pCodeGen;
|
|
ph7_value *pRawObj;
|
|
sxu32 nObjIdx;
|
|
sxi32 nRawObj;
|
|
int is_expr;
|
|
sxi32 rc;
|
|
if(pScript->nByte < 1) {
|
|
/* Nothing to compile */
|
|
return PH7_OK;
|
|
}
|
|
/* Initialize the tokens containers */
|
|
SySetInit(&aRawToken, &pVm->sAllocator, sizeof(SyToken));
|
|
SySetInit(&aPhpToken, &pVm->sAllocator, sizeof(SyToken));
|
|
SySetAlloc(&aPhpToken, 0xc0);
|
|
is_expr = 0;
|
|
if(iFlags & PH7_PHP_ONLY) {
|
|
SyToken sTmp;
|
|
/* PHP only: -*/
|
|
sTmp.nLine = 1;
|
|
sTmp.nType = PH7_TOKEN_PHP;
|
|
sTmp.pUserData = 0;
|
|
SyStringDupPtr(&sTmp.sData, pScript);
|
|
SySetPut(&aRawToken, (const void *)&sTmp);
|
|
if(iFlags & PH7_PHP_EXPR) {
|
|
/* A simple PHP expression */
|
|
is_expr = 1;
|
|
}
|
|
} else {
|
|
/* Tokenize raw text */
|
|
SySetAlloc(&aRawToken, 32);
|
|
PH7_TokenizeRawText(pScript->zString, pScript->nByte, &aRawToken);
|
|
}
|
|
pCodeGen = &pVm->sCodeGen;
|
|
/* Process high-level tokens */
|
|
pCodeGen->pRawIn = (SyToken *)SySetBasePtr(&aRawToken);
|
|
pCodeGen->pRawEnd = &pCodeGen->pRawIn[SySetUsed(&aRawToken)];
|
|
rc = PH7_OK;
|
|
if(is_expr) {
|
|
/* Compile the expression */
|
|
rc = PH7_CompilePHP(pCodeGen, &aPhpToken, TRUE);
|
|
goto cleanup;
|
|
}
|
|
nObjIdx = 0;
|
|
/* Start the compilation process */
|
|
for(;;) {
|
|
if(pCodeGen->pRawIn >= pCodeGen->pRawEnd) {
|
|
break; /* No more tokens to process */
|
|
}
|
|
if(pCodeGen->pRawIn->nType & PH7_TOKEN_PHP) {
|
|
/* Compile the PHP chunk */
|
|
rc = PH7_CompilePHP(pCodeGen, &aPhpToken, FALSE);
|
|
if(rc == SXERR_ABORT) {
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
/* Raw chunk: [i.e: HTML, XML, etc.] */
|
|
nRawObj = 0;
|
|
while((pCodeGen->pRawIn < pCodeGen->pRawEnd) && (pCodeGen->pRawIn->nType != PH7_TOKEN_PHP)) {
|
|
/* Consume the raw chunk without any processing */
|
|
pRawObj = PH7_ReserveConstObj(&(*pVm), &nObjIdx);
|
|
if(pRawObj == 0) {
|
|
rc = SXERR_MEM;
|
|
break;
|
|
}
|
|
/* Mark as constant and emit the load constant instruction */
|
|
PH7_MemObjInitFromString(pVm, pRawObj, &pCodeGen->pRawIn->sData);
|
|
PH7_VmEmitInstr(&(*pVm), PH7_OP_LOADC, 0, nObjIdx, 0, 0);
|
|
++nRawObj;
|
|
pCodeGen->pRawIn++; /* Next chunk */
|
|
}
|
|
if(nRawObj > 0) {
|
|
/* Emit the consume instruction */
|
|
PH7_VmEmitInstr(&(*pVm), PH7_OP_CONSUME, nRawObj, 0, 0, 0);
|
|
}
|
|
}
|
|
cleanup:
|
|
SySetRelease(&aRawToken);
|
|
SySetRelease(&aPhpToken);
|
|
return rc;
|
|
}
|
|
/*
|
|
* Utility routines.Initialize the code generator.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_InitCodeGenerator(
|
|
ph7_vm *pVm, /* Target VM */
|
|
ProcConsumer xErr, /* Error log consumer callabck */
|
|
void *pErrData /* Last argument to xErr() */
|
|
) {
|
|
ph7_gen_state *pGen = &pVm->sCodeGen;
|
|
/* Zero the structure */
|
|
SyZero(pGen, sizeof(ph7_gen_state));
|
|
/* Initial state */
|
|
pGen->pVm = &(*pVm);
|
|
pGen->xErr = xErr;
|
|
pGen->pErrData = pErrData;
|
|
SyHashInit(&pGen->hLiteral, &pVm->sAllocator, 0, 0);
|
|
SyHashInit(&pGen->hVar, &pVm->sAllocator, 0, 0);
|
|
/* Error log buffer */
|
|
SyBlobInit(&pGen->sErrBuf, &pVm->sAllocator);
|
|
/* General purpose working buffer */
|
|
SyBlobInit(&pGen->sWorker, &pVm->sAllocator);
|
|
/* Create the global scope */
|
|
GenStateInitBlock(pGen, &pGen->sGlobal, GEN_BLOCK_GLOBAL, PH7_VmInstrLength(&(*pVm)), 0);
|
|
/* Point to the global scope */
|
|
pGen->pCurrent = &pGen->sGlobal;
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Utility routines. Reset the code generator to it's initial state.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_ResetCodeGenerator(
|
|
ph7_vm *pVm, /* Target VM */
|
|
ProcConsumer xErr, /* Error log consumer callabck */
|
|
void *pErrData /* Last argument to xErr() */
|
|
) {
|
|
ph7_gen_state *pGen = &pVm->sCodeGen;
|
|
GenBlock *pBlock, *pParent;
|
|
/* Reset state */
|
|
SyBlobRelease(&pGen->sErrBuf);
|
|
SyBlobRelease(&pGen->sWorker);
|
|
/* Point to the global scope */
|
|
pBlock = pGen->pCurrent;
|
|
while(pBlock->pParent != 0) {
|
|
pParent = pBlock->pParent;
|
|
GenStateFreeBlock(pBlock);
|
|
pBlock = pParent;
|
|
}
|
|
pGen->xErr = xErr;
|
|
pGen->pErrData = pErrData;
|
|
pGen->pCurrent = &pGen->sGlobal;
|
|
pGen->pRawIn = pGen->pRawEnd = 0;
|
|
pGen->pIn = pGen->pEnd = 0;
|
|
pGen->nErr = 0;
|
|
return SXRET_OK;
|
|
}
|
|
/*
|
|
* Generate a compile-time error message.
|
|
* If the error count limit is reached (usually 15 error message)
|
|
* this function return SXERR_ABORT.In that case upper-layers must
|
|
* abort compilation immediately.
|
|
*/
|
|
PH7_PRIVATE sxi32 PH7_GenCompileError(ph7_gen_state *pGen, sxi32 nErrType, sxu32 nLine, const char *zFormat, ...) {
|
|
SyBlob *pWorker = &pGen->sErrBuf;
|
|
const char *zErr = "Error";
|
|
SyString *pFile;
|
|
va_list ap;
|
|
sxi32 rc;
|
|
/* Reset the working buffer */
|
|
SyBlobReset(pWorker);
|
|
/* Peek the processed file path if available */
|
|
pFile = (SyString *)SySetPeek(&pGen->pVm->aFiles);
|
|
if(pFile && pGen->xErr) {
|
|
/* Append file name */
|
|
SyBlobAppend(pWorker, pFile->zString, pFile->nByte);
|
|
SyBlobAppend(pWorker, (const void *)": ", sizeof(": ") - 1);
|
|
}
|
|
if(nErrType == E_ERROR) {
|
|
/* Increment the error counter */
|
|
pGen->nErr++;
|
|
if(pGen->nErr > 15) {
|
|
/* Error count limit reached */
|
|
if(pGen->xErr) {
|
|
SyBlobFormat(pWorker, "%u Error count limit reached,PH7 is aborting compilation\n", nLine);
|
|
if(SyBlobLength(pWorker) > 0) {
|
|
/* Consume the generated error message */
|
|
pGen->xErr(SyBlobData(pWorker), SyBlobLength(pWorker), pGen->pErrData);
|
|
}
|
|
}
|
|
/* Abort immediately */
|
|
return SXERR_ABORT;
|
|
}
|
|
}
|
|
if(pGen->xErr == 0) {
|
|
/* No available error consumer,return immediately */
|
|
return SXRET_OK;
|
|
}
|
|
switch(nErrType) {
|
|
case E_WARNING:
|
|
zErr = "Warning";
|
|
break;
|
|
case E_PARSE:
|
|
zErr = "Parse error";
|
|
break;
|
|
case E_NOTICE:
|
|
zErr = "Notice";
|
|
break;
|
|
case E_USER_ERROR:
|
|
zErr = "User error";
|
|
break;
|
|
case E_USER_WARNING:
|
|
zErr = "User warning";
|
|
break;
|
|
case E_USER_NOTICE:
|
|
zErr = "User notice";
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
rc = SXRET_OK;
|
|
/* Format the error message */
|
|
SyBlobFormat(pWorker, "%u %s: ", nLine, zErr);
|
|
va_start(ap, zFormat);
|
|
SyBlobFormatAp(pWorker, zFormat, ap);
|
|
va_end(ap);
|
|
/* Append a new line */
|
|
SyBlobAppend(pWorker, (const void *)"\n", sizeof(char));
|
|
if(SyBlobLength(pWorker) > 0) {
|
|
/* Consume the generated error message */
|
|
pGen->xErr(SyBlobData(pWorker), SyBlobLength(pWorker), pGen->pErrData);
|
|
}
|
|
return rc;
|
|
}
|