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Support #pragma dynexport on OS X.

Browse Source 
R=rsc
CC=golang-dev
https://golang.org/cl/733041
This commit is contained in:
Ian Lance Taylor 2010-03-25 11:45:18 -07:00
parent a291e998c1
commit 732f3919ab
1 changed files with 109 additions and 21 deletions
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130
src/cmd/ld/macho.c
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@ -105,6 +105,14 @@ static uchar *strtab;
static uint32 nstrtab;
static uint32 mstrtab;
struct Expsym
{
int off;
Sym* s;
} *expsym;
static int nexpsym;
static int nimpsym;
static char **dylib;
static int ndylib;
@ -264,11 +272,12 @@ needlib(char *name)
void
domacho(void)
{
int h, nsym, ptrsize;
int h, ptrsize, t;
char *p;
uchar *dat;
uint32 x;
Sym *s;
Sym **impsym;
ptrsize = 4;
if(macho64)
@ -278,17 +287,26 @@ domacho(void)
if(!debug['d'])
*(char*)grow(&strtab, &nstrtab, &mstrtab, 2) = ' ';
nsym = 0;
impsym = nil;
for(h=0; h<NHASH; h++) {
for(s=hash[h]; s!=S; s=s->link) {
if(!s->reachable || (s->type != SDATA && s->type != SBSS) || s->dynimpname == nil)
if(!s->reachable || (s->type != STEXT && s->type != SDATA && s->type != SBSS) || s->dynimpname == nil)
continue;
if(debug['d']) {
diag("cannot use dynamic loading and -d");
errorexit();
}
s->type = SMACHO;
s->value = nsym*ptrsize;
if(!s->dynexport) {
if(nimpsym%32 == 0) {
impsym = realloc(impsym, (nimpsym+32)*sizeof impsym[0]);
if(impsym == nil) {
diag("out of memory");
errorexit();
}
}
impsym[nimpsym++] = s;
continue;
}
/* symbol table entry - darwin still puts _ prefixes on all C symbols */
x = nstrtab;
@ -301,29 +319,73 @@ domacho(void)
dat[1] = x>>8;
dat[2] = x>>16;
dat[3] = x>>24;
dat[4] = 0x01; // type: N_EXT - external symbol
if(needlib(s->dynimplib)) {
if(ndylib%32 == 0) {
dylib = realloc(dylib, (ndylib+32)*sizeof dylib[0]);
if(dylib == nil) {
diag("out of memory");
errorexit();
}
}
dylib[ndylib++] = s->dynimplib;
dat[4] = 0x0f; // type: N_SECT | N_EXT - external, defined in sect
switch(s->type) {
default:
case STEXT:
t = 1;
break;
case SDATA:
t = 2;
break;
case SBSS:
t = 4;
break;
}
nsym++;
dat[5] = t; // sect: section number
if (nexpsym%32 == 0) {
expsym = realloc(expsym, (nexpsym+32)*sizeof expsym[0]);
if (expsym == nil) {
diag("out of memory");
errorexit();
}
}
expsym[nexpsym].off = nlinkdata - ptrsize;
expsym[nexpsym++].s = s;
}
}
for(h=0; h<nimpsym; h++) {
s = impsym[h];
s->type = SMACHO;
s->value = (nexpsym+h) * ptrsize;
/* symbol table entry - darwin still puts _ prefixes on all C symbols */
x = nstrtab;
p = grow(&strtab, &nstrtab, &mstrtab, 1+strlen(s->dynimpname)+1);
*p++ = '_';
strcpy(p, s->dynimpname);
dat = grow(&linkdata, &nlinkdata, &mlinkdata, 8+ptrsize);
dat[0] = x;
dat[1] = x>>8;
dat[2] = x>>16;
dat[3] = x>>24;
dat[4] = 0x01; // type: N_EXT - external symbol
if(needlib(s->dynimplib)) {
if(ndylib%32 == 0) {
dylib = realloc(dylib, (ndylib+32)*sizeof dylib[0]);
if(dylib == nil) {
diag("out of memory");
errorexit();
}
}
dylib[ndylib++] = s->dynimplib;
}
}
free(impsym);
/*
* list of symbol table indexes.
* we don't take advantage of the opportunity
* to order the symbol table differently from
* this list, so it is boring: 0 1 2 3 4 ...
*/
for(x=0; x<nsym; x++) {
for(x=0; x<nexpsym+nimpsym; x++) {
dat = grow(&linkdata, &nlinkdata, &mlinkdata, 4);
dat[0] = x;
dat[1] = x>>8;
@ -331,16 +393,42 @@ domacho(void)
dat[3] = x>>24;
}
dynptrsize = nsym*ptrsize;
dynptrsize = (nexpsym+nimpsym) * ptrsize;
}
vlong
domacholink(void)
{
int i;
uchar *p;
Sym *s;
uint64 val;
linkoff = 0;
if(nlinkdata > 0) {
linkoff = rnd(HEADR+textsize, INITRND) + rnd(datsize, INITRND);
seek(cout, linkoff, 0);
for(i = 0; i<nexpsym; ++i) {
s = expsym[i].s;
val = s->value;
if(s->type == SUNDEF)
diag("export of undefined symbol %s", s->name);
if (s->type != STEXT)
val += INITDAT;
p = linkdata+expsym[i].off;
p[0] = val;
p[1] = val >> 8;
p[2] = val >> 16;
p[3] = val >> 24;
if (macho64) {
p[4] = val >> 32;
p[5] = val >> 40;
p[6] = val >> 48;
p[7] = val >> 56;
}
}
write(cout, linkdata, nlinkdata);
write(cout, strtab, nstrtab);
}
@ -476,9 +564,9 @@ asmbmacho(vlong symdatva, vlong symo)
ml->data[0] = 0; /* ilocalsym */
ml->data[1] = 0; /* nlocalsym */
ml->data[2] = 0; /* iextdefsym */
ml->data[3] = 0; /* nextdefsym */
ml->data[4] = 0; /* iundefsym */
ml->data[5] = nsym; /* nundefsym */
ml->data[3] = nexpsym; /* nextdefsym */
ml->data[4] = nexpsym; /* iundefsym */
ml->data[5] = nimpsym; /* nundefsym */
ml->data[6] = 0; /* tocoffset */
ml->data[7] = 0; /* ntoc */
ml->data[8] = 0; /* modtaboff */