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output: macho -- Add support for N_PEXT in macho output

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This allows to mark global symbols as private external.
Similar to visibility hidden in ELF output.

Signed-off-by: Matthieu Darbois <mayeut@users.noreply.github.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Matthieu Darbois 2018-02-25 17:40:25 +03:00 committed by Cyrill Gorcunov
parent 8a7c6009fb
commit 9adfd34b03
1 changed files with 36 additions and 5 deletions
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41
output/outmacho.c
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@ -233,6 +233,7 @@ struct symbol {
/* symbol type bits */
#define N_EXT 0x01 /* global or external symbol */
#define N_PEXT 0x10 /* private external symbol */
#define N_UNDF 0x0 /* undefined symbol | n_sect == */
#define N_ABS 0x2 /* absolute symbol | NO_SECT */
@ -992,14 +993,29 @@ static void macho_symdef(char *name, int32_t section, int64_t offset,
{
struct symbol *sym;
struct section *s;
bool special_used = false;
if (special) {
nasm_error(ERR_NONFATAL, "The Mach-O output format does "
"not support any special symbol types");
return;
}
#if defined(DEBUG) && DEBUG>2
nasm_error(ERR_DEBUG,
" macho_symdef: %s, sec=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n",
name, section, offset, is_global, special);
#endif
if (is_global == 3) {
if (special) {
int n = strcspn(special, " \t");
if (!nasm_strnicmp(special, "private_extern", n)) {
for (sym = syms; sym != NULL; sym = sym->next) {
if (!strcmp(name, sym->name)) {
if (sym->type & N_PEXT)
return; /* nothing to be done */
else
break;
}
}
}
}
nasm_error(ERR_NONFATAL, "The Mach-O format does not "
"(yet) support forward reference fixups.");
return;
@ -1032,6 +1048,18 @@ static void macho_symdef(char *name, int32_t section, int64_t offset,
if (is_global != 0) {
sym->type |= N_EXT;
}
if (is_global == 1) {
/* check special to see if the global symbol shall be marked as private external: N_PEXT */
if (special) {
int n = strcspn(special, " \t");
if (!nasm_strnicmp(special, "private_extern", n))
sym->type |= N_PEXT;
else
nasm_error(ERR_NONFATAL, "unrecognised symbol type `%.*s'", n, special);
}
special_used = true;
}
if (section == NO_SEG) {
/* symbols in no section get absolute */
@ -1083,6 +1111,9 @@ static void macho_symdef(char *name, int32_t section, int64_t offset,
}
++nsyms;
if (special && !special_used)
nasm_error(ERR_NONFATAL, "no special symbol features supported here");
}
static void macho_sectalign(int32_t seg, unsigned int value)