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Fix forward asm labels differently

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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
This commit is contained in:
Michael Matz 2017-11-19 03:04:11 +01:00
parent a8ece0f2ce
commit d0db21757a
1 changed files with 31 additions and 9 deletions
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28
tccasm.c
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@ -52,7 +52,7 @@ ST_FUNC Sym* get_asm_sym(int name, Sym *csym)
Sym *sym = label_find(name);
if (!sym) {
sym = label_push(&tcc_state->asm_labels, name, 0);
sym->type.t = VT_VOID | VT_EXTERN;
sym->type.t = VT_VOID | VT_STATIC | VT_EXTERN;
if (!csym) {
csym = sym_find(name);
/* We might be called for an asm block from inside a C routine
@ -72,7 +72,7 @@ ST_FUNC Sym* get_asm_sym(int name, Sym *csym)
sym->r = esym->st_shndx;
sym->jnext = esym->st_value;
/* XXX can't yet store st_size anywhere. */
sym->type.t &= ~VT_EXTERN;
sym->type.t = VT_VOID | (csym->type.t & VT_STATIC);
/* Mark that this asm symbol doesn't need to be fed back. */
sym->a.dllimport = 1;
}
@ -409,6 +409,24 @@ static Sym* set_symbol(TCCState *s1, int label)
return asm_new_label1(s1, label, 0, e.sym ? e.sym->r : SHN_ABS, n);
}
/* Patch ELF symbol associated with SYM based on the assemblers
understanding. */
static void patch_binding(Sym *sym)
{
ElfW(Sym) *esym;
if (0 == sym->c)
return;
esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
if (sym->a.visibility)
esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
| sym->a.visibility;
esym->st_info = ELFW(ST_INFO)(sym->a.weak ? STB_WEAK
: (sym->type.t & VT_STATIC) ? STB_LOCAL
: STB_GLOBAL,
ELFW(ST_TYPE)(esym->st_info));
}
static void asm_free_labels(TCCState *st)
{
Sym *s, *s1;
@ -418,13 +436,17 @@ static void asm_free_labels(TCCState *st)
s1 = s->prev;
/* define symbol value in object file */
s->type.t &= ~VT_EXTERN;
if (s->r && !s->a.dllimport) {
if (!s->a.dllimport) {
if (s->r) {
if (s->r == SHN_ABS)
sec = SECTION_ABS;
else
sec = st->sections[s->r];
put_extern_sym2(s, sec, s->jnext, 0, 0);
} else /* undefined symbols are global */
s->type.t &= ~VT_STATIC;
}
patch_binding(s);
/* remove label */
table_ident[s->v - TOK_IDENT]->sym_label = NULL;
sym_free(s);