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Implement the implicit 'auto' type.
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An implicitly typed local variable is strongly typed just as if it had been declared the type, but the compiler determines the type. The following two declarations of $i are functionally equivalent:
int $i = 10; // Explicitly typed.
auto $i = 10; // Implicitly typed.
This commit is contained in:
Rafal Kupiec
2019-06-08 12:55:57 +02:00
parent cbe4f29909
commit 78c416c6b8
2 changed files with 18 additions and 12 deletions
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6
engine/compiler.c
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@@ -2466,6 +2466,8 @@ static sxi32 PH7_CompileVar(ph7_gen_state *pGen) {
PH7_VmEmitInstr(pGen->pVm, pGen->pIn->nLine, PH7_OP_DONE, (rc != SXERR_EMPTY ? 1 : 0), 1, 0, 0);
/* Restore default bytecode container */
PH7_VmSetByteCodeContainer(pGen->pVm, pInstrContainer);
} else if(nType == MEMOBJ_NULL) {
PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Implicitly-typed variable '$%z' must be initialized", pName);
}
/* Set static variable type */
sStatic.iFlags = nType;
@@ -2492,6 +2494,8 @@ static sxi32 PH7_CompileVar(ph7_gen_state *pGen) {
} else {
PH7_VmEmitInstr(pGen->pVm, nLine, PH7_OP_POP, 1, 0, 0, 0);
}
} else if(nType == MEMOBJ_NULL) {
PH7_GenCompileError(&(*pGen), E_ERROR, pGen->pIn->nLine, "Implicitly-typed variable '$%z' must be initialized", pName);
} else {
pGen->pIn += 2; /* Jump the dollar '$' sign and variable name */
}
@@ -4926,7 +4930,7 @@ static ProcLangConstruct PH7_GenStateGetStatementHandler(
SyToken *pLookahead /* Look-ahead token */
) {
sxu32 n = 0;
if((nKeywordID & PH7_KEYWORD_TYPEDEF) != 0 || nKeywordID == PH7_KEYWORD_STATIC) {
if((nKeywordID & PH7_KEYWORD_AUTO) != 0 || (nKeywordID & PH7_KEYWORD_TYPEDEF) != 0 || nKeywordID == PH7_KEYWORD_STATIC) {
if(nKeywordID == PH7_KEYWORD_STATIC && pLookahead && (pLookahead->nType & PH7_TK_OP)) {
const ph7_expr_op *pOp = (const ph7_expr_op *)pLookahead->pUserData;
if(pOp && pOp->iOp == EXPR_OP_DC /*::*/) {