Implement attribute((nodecorate))

Prevent any decoration that would otherwise affect an exported PE function. For example, given the following: __declspec(dllexport) __stdcall int decorated(int arg) { return 0; } __declspec(dllexport) __stdcall __attribute__((nodecorate)) int undecorated(int arg) { return 0; } The following exported functions can now be seen in the DLL: _decorated@4 undecorated The attribute is recognised for all targets but only affects PE codegen. I'm not sure whether this would be useful for other targets; its intended use was to allow the creation of a DLL matching an existing set of signatures.

Jonathan Newman committed 8 years ago

Commit 0edbed11 parent d79caa94 files · +12 −1Browse files

Unified · Split

4 files

tcc-doc.texi +3 −0
tcc.h +2 −1
tccgen.c +6 −0
tcctok.h +1 −0

tcc-doc.texi+3−0

@@ -548,6 +548,7 @@ instead of · 547 unmodified lines
548	548	@cindex stdcall attribute
549	549	@cindex regparm attribute
550	550	@cindex dllexport attribute
	551	+@cindex nodecorate attribute
551	552
552	553	@item The keyword @code{__attribute__} is handled to specify variable or
553	554	function attributes. The following attributes are supported:
@@ -575,6 +576,8 @@ registers @code{%eax}, @code{%edx} and @code{%ecx}. · 21 unmodified lines
575	576
576	577	@item @code{dllexport}: export function from dll/executable (win32 only)
577	578
	579	+ @item @code{nodecorate}: do not apply any decorations that would otherwise be applied when exporting function from dll/executable (win32 only)
	580	+
578	581	@end itemize
579	582
580	583	Here are some examples:

tcc.h+2−1

@@ -439,8 +439,9 @@ struct SymAttr { · 438 unmodified lines
439	439	weak : 1,
440	440	visibility : 2,
441	441	dllexport : 1,
	442	+ nodecorate : 1,
442	443	dllimport : 1,
443		− unused : 5;
	444	+ unused : 4;
444	445	};
445	446
446	447	/* function attributes or temporary attributes for parsing */

tccgen.c+6−0

@@ -391,6 +391,9 @@ ST_FUNC void put_extern_sym2(Sym *sym, int sh_num, · 390 unmodified lines
391	391	#ifdef TCC_TARGET_PE
392	392	if (sym_type == STT_FUNC && sym->type.ref) {
393	393	Sym *ref = sym->type.ref;
	394	+ if (ref->a.nodecorate) {
	395	+ can_add_underscore = 0;
	396	+ }
394	397	if (ref->f.func_call == FUNC_STDCALL && can_add_underscore) {
395	398	sprintf(buf1, "_%s@%d", name, ref->f.func_args * PTR_SIZE);
396	399	name = buf1;
@@ -3438,6 +3441,9 @@ redo: · 3041 unmodified lines
3438	3441	case TOK_DLLEXPORT:
3439	3442	ad->a.dllexport = 1;
3440	3443	break;
	3444	+ case TOK_NODECORATE:
	3445	+ ad->a.nodecorate = 1;
	3446	+ break;
3441	3447	case TOK_DLLIMPORT:
3442	3448	ad->a.dllimport = 1;
3443	3449	break;

tcctok.h+1−0

@@ -132,6 +132,7 @@ · 131 unmodified lines
132	132
133	133	DEF(TOK_DLLEXPORT, "dllexport")
134	134	DEF(TOK_DLLIMPORT, "dllimport")
	135	+ DEF(TOK_NODECORATE, "nodecorate")
135	136	DEF(TOK_NORETURN1, "noreturn")
136	137	DEF(TOK_NORETURN2, "__noreturn__")
137	138	DEF(TOK_VISIBILITY1, "visibility")

Implement attribute((nodecorate))

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