#ifndef _COMPILER_H_
#define _COMPILER_H_

#include "ph7int.h"

/* Forward declaration */
typedef struct LangConstruct LangConstruct;
typedef struct JumpFixup     JumpFixup;

/* Block [i.e: set of statements] control flags */
#define GEN_BLOCK_LOOP        0x001    /* Loop block [i.e: for,while,...] */
#define GEN_BLOCK_PROTECTED   0x002    /* Protected block */
#define GEN_BLOCK_COND        0x004    /* Conditional block [i.e: if(condition){} ]*/
#define GEN_BLOCK_FUNC        0x008    /* Function body */
#define GEN_BLOCK_GLOBAL      0x010    /* Global block (always set)*/
#define GEN_BLOC_NESTED_FUNC  0x020    /* Nested function body */
#define GEN_BLOCK_EXPR        0x040    /* Expression */
#define GEN_BLOCK_STD         0x080    /* Standard block */
#define GEN_BLOCK_EXCEPTION   0x100    /* Exception block [i.e: try{ } }*/
#define GEN_BLOCK_SWITCH      0x200    /* Switch statement */

/*
 * Compilation of some Aer constructs such as if, for, while, the logical or
 * (||) and logical and (&&) operators in expressions requires the
 * generation of forward jumps.
 * Since the destination PC target of these jumps isn't known when the jumps
 * are emitted, we record each forward jump in an instance of the following
 * structure. Those jumps are fixed later when the jump destination is resolved.
 */
struct JumpFixup {
	sxi32 nJumpType;     /* Jump type. Either TRUE jump, FALSE jump or Unconditional jump */
	sxu32 nInstrIdx;     /* Instruction index to fix later when the jump destination is resolved. */
};

/*
 * Each language construct is represented by an instance
 * of the following structure.
 */
struct LangConstruct {
	sxu32 nID;                     /* Language construct ID [i.e: PH7_TKWRD_WHILE,PH7_TKWRD_FOR,PH7_TKWRD_IF...] */
	ProcLangConstruct xConstruct;  /* C function implementing the language construct */
};

/* Compilation flags */
#define PH7_COMPILE_SINGLE_STMT 0x001 /* Compile a single statement */

/* Token stream synchronization macros */
#define SWAP_TOKEN_STREAM(GEN,START,END)\
	pTmp  = GEN->pEnd;\
	pGen->pIn  = START;\
	pGen->pEnd = END

#define UPDATE_TOKEN_STREAM(GEN)\
	if( GEN->pIn < pTmp ){\
		GEN->pIn++;\
	}\
	GEN->pEnd = pTmp

#define SWAP_DELIMITER(GEN,START,END)\
	pTmpIn  = GEN->pIn;\
	pTmpEnd = GEN->pEnd;\
	GEN->pIn = START;\
	GEN->pEnd = END

#define RE_SWAP_DELIMITER(GEN)\
	GEN->pIn  = pTmpIn;\
	GEN->pEnd = pTmpEnd

/* Flags related to expression compilation */
#define EXPR_FLAG_LOAD_IDX_STORE    0x001 /* Set the iP2 flag when dealing with the LOAD_IDX instruction */
#define EXPR_FLAG_RDONLY_LOAD       0x002 /* Read-only load, refer to the 'PH7_OP_LOAD' VM instruction for more information */
#define EXPR_FLAG_COMMA_STATEMENT   0x004 /* Treat comma expression as a single statement (used by class attributes) */

/* Forward declaration */
static sxi32 PH7_CompileExpr(ph7_gen_state *pGen, sxi32 iFlags, sxi32(*xTreeValidator)(ph7_gen_state *, ph7_expr_node *));

#endif /* _COMPILER_H_ */