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Add __builtin_return_address.

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Implementation is mostly shared with __builtin_frame_address.
It seems to work on arm64, i386 and x86_64. It may need to be
adapted for other targets.
This commit is contained in:
Edmund Grimley Evans 2015-03-06 21:01:14 +00:00
parent 8764993c0d
commit 238e760a29
2 changed files with 14 additions and 1 deletions
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14
tccgen.c
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@ -3874,13 +3874,18 @@ ST_FUNC void unary(void)
} }
break; break;
case TOK_builtin_frame_address: case TOK_builtin_frame_address:
case TOK_builtin_return_address:
{ {
int tok1 = tok;
int level; int level;
CType type; CType type;
next(); next();
skip('('); skip('(');
if (tok != TOK_CINT || tokc.i < 0) { if (tok != TOK_CINT || tokc.i < 0) {
tcc_error("__builtin_frame_address only takes positive integers"); tcc_error("%s only takes positive integers",
tok1 == TOK_builtin_return_address ?
"__builtin_return_address" :
"__builtin_frame_address");
} }
level = tokc.i; level = tokc.i;
next(); next();
@ -3892,6 +3897,13 @@ ST_FUNC void unary(void)
mk_pointer(&vtop->type); mk_pointer(&vtop->type);
indir(); /* -> parent frame */ indir(); /* -> parent frame */
} }
if (tok1 == TOK_builtin_return_address) {
// assume return address is just above frame pointer on stack
vpushi(PTR_SIZE);
gen_op('+');
mk_pointer(&vtop->type);
indir();
}
} }
break; break;
#ifdef TCC_TARGET_X86_64 #ifdef TCC_TARGET_X86_64

1
tcctok.h
View File

@ -130,6 +130,7 @@
DEF(TOK_builtin_types_compatible_p, "__builtin_types_compatible_p") DEF(TOK_builtin_types_compatible_p, "__builtin_types_compatible_p")
DEF(TOK_builtin_constant_p, "__builtin_constant_p") DEF(TOK_builtin_constant_p, "__builtin_constant_p")
DEF(TOK_builtin_frame_address, "__builtin_frame_address") DEF(TOK_builtin_frame_address, "__builtin_frame_address")
DEF(TOK_builtin_return_address, "__builtin_return_address")
#ifdef TCC_TARGET_X86_64 #ifdef TCC_TARGET_X86_64
#ifdef TCC_TARGET_PE #ifdef TCC_TARGET_PE
DEF(TOK_builtin_va_start, "__builtin_va_start") DEF(TOK_builtin_va_start, "__builtin_va_start")