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tccasm: Don't abuse dllexport/dllimport

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For tracking if asm symbols are connected with a C symbol,
and if asm symbols need to be global use new flags, instead of
reusing dllimport/dllexport, which would cause unrequested exported
entries on Windows.

This is a stop-gap until the C and asm symtable are unified.
This commit is contained in:
Michael Matz 2017-11-25 19:41:03 +01:00
parent e7c71e2473
commit 4266ebd69c
2 changed files with 10 additions and 8 deletions
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4
tcc.h
View File

@ -440,7 +440,9 @@ struct SymAttr {
visibility : 2, visibility : 2,
dllexport : 1, dllexport : 1,
dllimport : 1, dllimport : 1,
unused : 5; asmcsym : 1,
asmexport : 1,
unused : 3;
}; };
/* function attributes or temporary attributes for parsing */ /* function attributes or temporary attributes for parsing */

14
tccasm.c
View File

@ -91,8 +91,8 @@ ST_FUNC Sym* get_asm_sym(int name, Sym *csym)
/* XXX can't yet store st_size anywhere. */ /* XXX can't yet store st_size anywhere. */
sym->type.t = VT_VOID | (csym->type.t & VT_STATIC); sym->type.t = VT_VOID | (csym->type.t & VT_STATIC);
/* Mark that this asm symbol doesn't need to be fed back. */ /* Mark that this asm symbol doesn't need to be fed back. */
sym->a.dllimport = 1; sym->a.asmcsym = 1;
sym->a.dllexport = !(csym->type.t & VT_STATIC); sym->a.asmexport = !(csym->type.t & VT_STATIC);
} }
} }
return sym; return sym;
@ -454,11 +454,11 @@ ST_FUNC void asm_free_labels(TCCState *st)
/* define symbol value in object file and care for updating /* define symbol value in object file and care for updating
the C and asm symbols */ the C and asm symbols */
s->type.t &= ~VT_EXTERN; s->type.t &= ~VT_EXTERN;
if (!s->a.dllimport) { if (!s->a.asmcsym) {
Sym *csym = sym_find(s->v); Sym *csym = sym_find(s->v);
ElfW(Sym) *esym = NULL; ElfW(Sym) *esym = NULL;
if (csym) { if (csym) {
s->a.dllexport |= !(csym->type.t & VT_STATIC); s->a.asmexport |= !(csym->type.t & VT_STATIC);
if (csym->c) { if (csym->c) {
esym = &((ElfW(Sym) *)symtab_section->data)[csym->c]; esym = &((ElfW(Sym) *)symtab_section->data)[csym->c];
if (s->c) { if (s->c) {
@ -473,7 +473,7 @@ ST_FUNC void asm_free_labels(TCCState *st)
} }
} }
} }
if (!s->a.dllexport) if (!s->a.asmexport)
s->type.t |= VT_STATIC; s->type.t |= VT_STATIC;
if (s->r) { if (s->r) {
if (s->r == SHN_ABS) if (s->r == SHN_ABS)
@ -485,7 +485,7 @@ ST_FUNC void asm_free_labels(TCCState *st)
if (!esym || esym->st_shndx == SHN_UNDEF || !was_ext) if (!esym || esym->st_shndx == SHN_UNDEF || !was_ext)
put_extern_sym2(s, sec, s->jnext, 0, 0); put_extern_sym2(s, sec, s->jnext, 0, 0);
} else /* undefined symbols are global */ } else /* undefined symbols are global */
s->type.t &= ~VT_STATIC, s->a.dllexport = 1; s->type.t &= ~VT_STATIC, s->a.asmexport = 1;
patch_binding(s); patch_binding(s);
} }
/* remove label */ /* remove label */
@ -750,7 +750,7 @@ static void asm_parse_directive(TCCState *s1, int global)
next(); next();
sym = get_asm_sym(tok, NULL); sym = get_asm_sym(tok, NULL);
if (tok1 != TOK_ASMDIR_hidden) if (tok1 != TOK_ASMDIR_hidden)
sym->type.t &= ~VT_STATIC, sym->a.dllexport = 1; sym->type.t &= ~VT_STATIC, sym->a.asmexport = 1;
if (tok1 == TOK_ASMDIR_weak) if (tok1 == TOK_ASMDIR_weak)
sym->a.weak = 1; sym->a.weak = 1;
else if (tok1 == TOK_ASMDIR_hidden) else if (tok1 == TOK_ASMDIR_hidden)