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tccgen: handle __attribute((alias("target")))

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This commit is contained in:
Joe Soroka 2011-03-03 01:58:45 -08:00
parent ce8c1886a5
commit c93eca4fe4
3 changed files with 27 additions and 1 deletions
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1
tcc.h
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@ -285,6 +285,7 @@ typedef struct AttributeDef {
resize : 1,
fill : 10;
struct Section *section;
int alias_target; /* token */
} AttributeDef;
/* gr: wrappers for casting sym->r for other purposes */

25
tccgen.c
View File

@ -2472,6 +2472,16 @@ static void parse_attribute(AttributeDef *ad)
next();
skip(')');
break;
case TOK_ALIAS1:
case TOK_ALIAS2:
skip('(');
if (tok != TOK_STR)
expect("alias(\"target\")");
ad->alias_target = /* save string as token, for later */
tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
next();
skip(')');
break;
case TOK_ALIGNED1:
case TOK_ALIGNED2:
if (tok == '(') {
@ -5578,7 +5588,20 @@ ST_FUNC void decl(int l)
/* NOTE: as GCC, uninitialized global static
arrays of null size are considered as
extern */
external_sym(v, &type, r, asm_label);
sym = external_sym(v, &type, r, asm_label);
if (ad.alias_target) {
Section tsec;
Elf32_Sym *esym;
Sym *alias_target;
alias_target = sym_find(ad.alias_target);
if (!alias_target || !alias_target->c)
error("unsupported forward __alias__ attribute");
esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
tsec.sh_num = esym->st_shndx;
put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
}
} else {
type.t |= (btype.t & VT_STATIC); /* Retain "static". */
if (type.t & VT_STATIC)

2
tcctok.h
View File

@ -100,6 +100,8 @@
DEF(TOK_PACKED2, "__packed__")
DEF(TOK_WEAK1, "weak")
DEF(TOK_WEAK2, "__weak__")
DEF(TOK_ALIAS1, "alias")
DEF(TOK_ALIAS2, "__alias__")
DEF(TOK_UNUSED1, "unused")
DEF(TOK_UNUSED2, "__unused__")
DEF(TOK_CDECL1, "cdecl")