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https://github.com/frida/tinycc
synced 2024-12-24 22:16:49 +03:00
Fix forward asm labels differently
while last change fixed one part of label behaviour (undefined ones must be global) it again broke a different aspect (forward defs without .globl must stay local). This fixes both aspects. That a label is local instead of global is difficult to test without resorting to look at the symbol table or using two-file testcases, so we do without. In essence the local/global-ness of symbols should be the same between GAS and TCC for this input: .globl glob1 glob1: call glob1 .globl glob2 call glob2 glob2: glob3: .globl glob3 call glob3 glob4: call glob4 .globl glob4 call glob5 .globl glob5 glob5: call glob6 glob6: .globl glob6 locl1: call locl1 call locl2 locl2: unref1: unref2: .globl unref2 .globl unref3 unref3: call undef
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parent
a8ece0f2ce
commit
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40
tccasm.c
40
tccasm.c
@ -52,7 +52,7 @@ ST_FUNC Sym* get_asm_sym(int name, Sym *csym)
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Sym *sym = label_find(name);
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if (!sym) {
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sym = label_push(&tcc_state->asm_labels, name, 0);
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sym->type.t = VT_VOID | VT_EXTERN;
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sym->type.t = VT_VOID | VT_STATIC | VT_EXTERN;
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if (!csym) {
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csym = sym_find(name);
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/* We might be called for an asm block from inside a C routine
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@ -72,7 +72,7 @@ ST_FUNC Sym* get_asm_sym(int name, Sym *csym)
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sym->r = esym->st_shndx;
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sym->jnext = esym->st_value;
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/* XXX can't yet store st_size anywhere. */
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sym->type.t &= ~VT_EXTERN;
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sym->type.t = VT_VOID | (csym->type.t & VT_STATIC);
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/* Mark that this asm symbol doesn't need to be fed back. */
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sym->a.dllimport = 1;
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}
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@ -409,6 +409,24 @@ static Sym* set_symbol(TCCState *s1, int label)
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return asm_new_label1(s1, label, 0, e.sym ? e.sym->r : SHN_ABS, n);
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}
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/* Patch ELF symbol associated with SYM based on the assemblers
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understanding. */
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static void patch_binding(Sym *sym)
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{
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ElfW(Sym) *esym;
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if (0 == sym->c)
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return;
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esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
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if (sym->a.visibility)
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esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
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| sym->a.visibility;
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esym->st_info = ELFW(ST_INFO)(sym->a.weak ? STB_WEAK
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: (sym->type.t & VT_STATIC) ? STB_LOCAL
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: STB_GLOBAL,
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ELFW(ST_TYPE)(esym->st_info));
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}
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static void asm_free_labels(TCCState *st)
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{
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Sym *s, *s1;
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@ -418,13 +436,17 @@ static void asm_free_labels(TCCState *st)
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s1 = s->prev;
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/* define symbol value in object file */
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s->type.t &= ~VT_EXTERN;
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if (s->r && !s->a.dllimport) {
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if (s->r == SHN_ABS)
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sec = SECTION_ABS;
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else
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sec = st->sections[s->r];
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put_extern_sym2(s, sec, s->jnext, 0, 0);
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}
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if (!s->a.dllimport) {
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if (s->r) {
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if (s->r == SHN_ABS)
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sec = SECTION_ABS;
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else
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sec = st->sections[s->r];
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put_extern_sym2(s, sec, s->jnext, 0, 0);
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} else /* undefined symbols are global */
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s->type.t &= ~VT_STATIC;
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}
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patch_binding(s);
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/* remove label */
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table_ident[s->v - TOK_IDENT]->sym_label = NULL;
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sym_free(s);
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