blob: 808708c2c392ea83286ad0f4cd43c29055cdfb61 [file] [log] [blame]
// Derived from Inferno utils/6l/obj.c
// http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "l.h"
#include "lib.h"
#include <ar.h>
int iconv(Fmt*);
char symname[] = SYMDEF;
char pkgname[] = "__.PKGDEF";
char* libdir[16];
int nlibdir = 0;
int cout = -1;
char* goroot;
char* goarch;
char* goos;
void
Lflag(char *arg)
{
if(nlibdir >= nelem(libdir)-1) {
print("too many -L's: %d\n", nlibdir);
usage();
}
libdir[nlibdir++] = arg;
}
void
libinit(void)
{
fmtinstall('i', iconv);
mywhatsys(); // get goroot, goarch, goos
if(strcmp(goarch, thestring) != 0)
print("goarch is not known: %s\n", goarch);
// add goroot to the end of the libdir list.
libdir[nlibdir++] = smprint("%s/pkg/%s_%s", goroot, goos, goarch);
unlink(outfile);
cout = create(outfile, 1, 0775);
if(cout < 0) {
diag("cannot create %s", outfile);
errorexit();
}
if(INITENTRY == nil) {
INITENTRY = mal(strlen(goarch)+strlen(goos)+10);
sprint(INITENTRY, "_rt0_%s_%s", goarch, goos);
}
lookup(INITENTRY, 0)->type = SXREF;
}
void
errorexit(void)
{
if(nerrors) {
if(cout >= 0)
remove(outfile);
exits("error");
}
exits(0);
}
void
addlib(char *src, char *obj)
{
char name[1024], pname[1024], comp[256], *p;
int i, search;
if(histfrogp <= 0)
return;
search = 0;
if(histfrog[0]->name[1] == '/') {
sprint(name, "");
i = 1;
} else
if(isalpha(histfrog[0]->name[1]) && histfrog[0]->name[2] == ':') {
strcpy(name, histfrog[0]->name+1);
i = 1;
} else
if(histfrog[0]->name[1] == '.') {
sprint(name, ".");
i = 0;
} else {
sprint(name, "");
i = 0;
search = 1;
}
for(; i<histfrogp; i++) {
snprint(comp, sizeof comp, "%s", histfrog[i]->name+1);
for(;;) {
p = strstr(comp, "$O");
if(p == 0)
break;
memmove(p+1, p+2, strlen(p+2)+1);
p[0] = thechar;
}
for(;;) {
p = strstr(comp, "$M");
if(p == 0)
break;
if(strlen(comp)+strlen(thestring)-2+1 >= sizeof comp) {
diag("library component too long");
return;
}
memmove(p+strlen(thestring), p+2, strlen(p+2)+1);
memmove(p, thestring, strlen(thestring));
}
if(strlen(name) + strlen(comp) + 3 >= sizeof(name)) {
diag("library component too long");
return;
}
if(i > 0 || !search)
strcat(name, "/");
strcat(name, comp);
}
cleanname(name);
if(search) {
// try dot, -L "libdir", and then goroot.
for(i=0; i<nlibdir; i++) {
snprint(pname, sizeof pname, "%s/%s", libdir[i], name);
if(access(pname, AEXIST) >= 0)
break;
}
}else
strcpy(pname, name);
cleanname(pname);
/* runtime.a -> runtime */
if(strlen(name) > 2 && name[strlen(name)-2] == '.')
name[strlen(name)-2] = '\0';
if(debug['v'])
Bprint(&bso, "%5.2f addlib: %s %s pulls in %s\n", cputime(), obj, src, pname);
addlibpath(src, obj, pname, name);
}
/*
* add library to library list.
* srcref: src file referring to package
* objref: object file referring to package
* file: object file, e.g., /home/rsc/go/pkg/container/vector.a
* pkg: package import path, e.g. container/vector
*/
void
addlibpath(char *srcref, char *objref, char *file, char *pkg)
{
int i;
Library *l;
char *p;
for(i=0; i<libraryp; i++)
if(strcmp(file, library[i].file) == 0)
return;
if(debug['v'])
Bprint(&bso, "%5.2f addlibpath: srcref: %s objref: %s file: %s pkg: %s\n",
cputime(), srcref, objref, file, pkg);
if(libraryp == nlibrary){
nlibrary = 50 + 2*libraryp;
library = realloc(library, sizeof library[0] * nlibrary);
}
l = &library[libraryp++];
p = mal(strlen(objref) + 1);
strcpy(p, objref);
l->objref = p;
p = mal(strlen(srcref) + 1);
strcpy(p, srcref);
l->srcref = p;
p = mal(strlen(file) + 1);
strcpy(p, file);
l->file = p;
p = mal(strlen(pkg) + 1);
strcpy(p, pkg);
l->pkg = p;
}
void
loadlib(void)
{
char pname[1024];
int i, found;
int32 h;
Sym *s;
found = 0;
for(i=0; i<nlibdir; i++) {
snprint(pname, sizeof pname, "%s/runtime.a", libdir[i]);
if(debug['v'])
Bprint(&bso, "searching for runtime.a in %s\n", pname);
if(access(pname, AEXIST) >= 0) {
addlibpath("internal", "internal", pname, "runtime");
found = 1;
break;
}
}
if(!found) Bprint(&bso, "warning: unable to find runtime.a\n");
loop:
xrefresolv = 0;
for(i=0; i<libraryp; i++) {
if(debug['v'])
Bprint(&bso, "%5.2f autolib: %s (from %s)\n", cputime(), library[i].file, library[i].objref);
objfile(library[i].file, library[i].pkg);
}
if(xrefresolv)
for(h=0; h<nelem(hash); h++)
for(s = hash[h]; s != S; s = s->link)
if(s->type == SXREF)
goto loop;
}
void
objfile(char *file, char *pkg)
{
int32 off, esym, cnt, l;
int work;
Biobuf *f;
Sym *s;
char magbuf[SARMAG];
char name[100], pname[150];
struct ar_hdr arhdr;
char *e, *start, *stop, *x;
pkg = smprint("%i", pkg);
if(file[0] == '-' && file[1] == 'l') { // TODO: fix this
if(debug['9'])
sprint(name, "/%s/lib/lib", thestring);
else
sprint(name, "/usr/%clib/lib", thechar);
strcat(name, file+2);
strcat(name, ".a");
file = name;
}
if(debug['v'])
Bprint(&bso, "%5.2f ldobj: %s (%s)\n", cputime(), file, pkg);
Bflush(&bso);
f = Bopen(file, 0);
if(f == nil) {
diag("cannot open file: %s", file);
errorexit();
}
l = Bread(f, magbuf, SARMAG);
if(l != SARMAG || strncmp(magbuf, ARMAG, SARMAG)){
/* load it as a regular file */
l = Bseek(f, 0L, 2);
Bseek(f, 0L, 0);
ldobj(f, pkg, l, file, FileObj);
Bterm(f);
return;
}
l = Bread(f, &arhdr, SAR_HDR);
if(l != SAR_HDR) {
diag("%s: short read on archive file symbol header", file);
goto out;
}
if(strncmp(arhdr.name, symname, strlen(symname))) {
diag("%s: first entry not symbol header", file);
goto out;
}
esym = SARMAG + SAR_HDR + atolwhex(arhdr.size);
off = SARMAG + SAR_HDR;
if(debug['u']) {
struct ar_hdr pkghdr;
int n;
// Read next ar header to check for package safe bit.
Bseek(f, esym+(esym&1), 0);
l = Bread(f, &pkghdr, SAR_HDR);
if(l != SAR_HDR) {
diag("%s: short read on second archive header", file);
goto out;
}
if(strncmp(pkghdr.name, pkgname, strlen(pkgname))) {
diag("%s: second entry not package header", file);
goto out;
}
n = atolwhex(pkghdr.size);
ldpkg(f, pkg, n, file, Pkgdef);
}
/*
* just bang the whole symbol file into memory
*/
Bseek(f, off, 0);
cnt = esym - off;
start = mal(cnt + 10);
cnt = Bread(f, start, cnt);
if(cnt <= 0){
Bterm(f);
return;
}
stop = &start[cnt];
memset(stop, 0, 10);
work = 1;
while(work) {
if(debug['v'])
Bprint(&bso, "%5.2f library pass: %s\n", cputime(), file);
Bflush(&bso);
work = 0;
for(e = start; e < stop; e = strchr(e+5, 0) + 1) {
x = expandpkg(e+5, pkg);
s = lookup(x, 0);
if(x != e+5)
free(x);
if(s->type != SXREF)
continue;
sprint(pname, "%s(%s)", file, s->name);
if(debug['v'])
Bprint(&bso, "%5.2f library: %s\n", cputime(), pname);
Bflush(&bso);
l = e[1] & 0xff;
l |= (e[2] & 0xff) << 8;
l |= (e[3] & 0xff) << 16;
l |= (e[4] & 0xff) << 24;
Bseek(f, l, 0);
l = Bread(f, &arhdr, SAR_HDR);
if(l != SAR_HDR)
goto bad;
if(strncmp(arhdr.fmag, ARFMAG, sizeof(arhdr.fmag)))
goto bad;
l = SARNAME;
while(l > 0 && arhdr.name[l-1] == ' ')
l--;
sprint(pname, "%s(%.*s)", file, l, arhdr.name);
l = atolwhex(arhdr.size);
ldobj(f, pkg, l, pname, ArchiveObj);
if(s->type == SXREF) {
diag("%s: failed to load: %s", file, s->name);
errorexit();
}
work = 1;
xrefresolv = 1;
}
}
return;
bad:
diag("%s: bad or out of date archive", file);
out:
Bterm(f);
}
void
ldobj(Biobuf *f, char *pkg, int64 len, char *pn, int whence)
{
static int files;
static char **filen;
char **nfilen, *line;
int i, n, c1, c2, c3;
vlong import0, import1, eof;
char src[1024];
eof = Boffset(f) + len;
src[0] = '\0';
// don't load individual object more than once.
// happens with import of .6 files because of loop in xresolv.
// doesn't happen with .a because SYMDEF is consulted
// first to decide whether each individual object file is needed.
for(i=0; i<files; i++)
if(strcmp(filen[i], pn) == 0)
return;
if((files&15) == 0){
nfilen = malloc((files+16)*sizeof(char*));
memmove(nfilen, filen, files*sizeof(char*));
free(filen);
filen = nfilen;
}
pn = strdup(pn);
filen[files++] = pn;
/* check the header */
line = Brdline(f, '\n');
if(line == nil) {
if(Blinelen(f) > 0) {
diag("%s: malformed object file", pn);
return;
}
goto eof;
}
n = Blinelen(f) - 1;
if(n != strlen(thestring) || strncmp(line, thestring, n) != 0) {
if(line)
line[n] = '\0';
if(strlen(pn) > 3 && strcmp(pn+strlen(pn)-3, ".go") == 0) {
print("%cl: input %s is not .%c file (use %cg to compile .go files)\n", thechar, pn, thechar, thechar);
errorexit();
}
diag("file not %s [%s]\n", thestring, line);
return;
}
/* skip over exports and other info -- ends with \n!\n */
import0 = Boffset(f);
c1 = '\n'; // the last line ended in \n
c2 = Bgetc(f);
c3 = Bgetc(f);
while(c1 != '\n' || c2 != '!' || c3 != '\n') {
c1 = c2;
c2 = c3;
c3 = Bgetc(f);
if(c3 == Beof)
goto eof;
}
import1 = Boffset(f);
Bseek(f, import0, 0);
ldpkg(f, pkg, import1 - import0 - 2, pn, whence); // -2 for !\n
Bseek(f, import1, 0);
ldobj1(f, pkg, eof - Boffset(f), pn);
return;
eof:
diag("truncated object file: %s", pn);
}
Sym*
lookup(char *symb, int v)
{
Sym *s;
char *p;
int32 h;
int l, c;
h = v;
for(p=symb; c = *p; p++)
h = h+h+h + c;
l = (p - symb) + 1;
// not if(h < 0) h = ~h, because gcc 4.3 -O2 miscompiles it.
h &= 0xffffff;
h %= NHASH;
for(s = hash[h]; s != S; s = s->link)
if(s->version == v)
if(memcmp(s->name, symb, l) == 0)
return s;
s = mal(sizeof(*s));
if(debug['v'] > 1)
Bprint(&bso, "lookup %s\n", symb);
s->name = mal(l + 1);
memmove(s->name, symb, l);
s->link = hash[h];
s->type = 0;
s->version = v;
s->value = 0;
s->sig = 0;
hash[h] = s;
nsymbol++;
return s;
}
void
copyhistfrog(char *buf, int nbuf)
{
char *p, *ep;
int i;
p = buf;
ep = buf + nbuf;
i = 0;
for(i=0; i<histfrogp; i++) {
p = seprint(p, ep, "%s", histfrog[i]->name+1);
if(i+1<histfrogp && (p == buf || p[-1] != '/'))
p = seprint(p, ep, "/");
}
}
void
addhist(int32 line, int type)
{
Auto *u;
Sym *s;
int i, j, k;
u = mal(sizeof(Auto));
s = mal(sizeof(Sym));
s->name = mal(2*(histfrogp+1) + 1);
u->asym = s;
u->type = type;
u->aoffset = line;
u->link = curhist;
curhist = u;
s->name[0] = 0;
j = 1;
for(i=0; i<histfrogp; i++) {
k = histfrog[i]->value;
s->name[j+0] = k>>8;
s->name[j+1] = k;
j += 2;
}
s->name[j] = 0;
s->name[j+1] = 0;
}
void
histtoauto(void)
{
Auto *l;
while(l = curhist) {
curhist = l->link;
l->link = curauto;
curauto = l;
}
}
void
collapsefrog(Sym *s)
{
int i;
/*
* bad encoding of path components only allows
* MAXHIST components. if there is an overflow,
* first try to collapse xxx/..
*/
for(i=1; i<histfrogp; i++)
if(strcmp(histfrog[i]->name+1, "..") == 0) {
memmove(histfrog+i-1, histfrog+i+1,
(histfrogp-i-1)*sizeof(histfrog[0]));
histfrogp--;
goto out;
}
/*
* next try to collapse .
*/
for(i=0; i<histfrogp; i++)
if(strcmp(histfrog[i]->name+1, ".") == 0) {
memmove(histfrog+i, histfrog+i+1,
(histfrogp-i-1)*sizeof(histfrog[0]));
goto out;
}
/*
* last chance, just truncate from front
*/
memmove(histfrog+0, histfrog+1,
(histfrogp-1)*sizeof(histfrog[0]));
out:
histfrog[histfrogp-1] = s;
}
void
nuxiinit(void)
{
int i, c;
for(i=0; i<4; i++) {
c = find1(0x04030201L, i+1);
if(i < 2)
inuxi2[i] = c;
if(i < 1)
inuxi1[i] = c;
inuxi4[i] = c;
inuxi8[i] = c;
inuxi8[i+4] = c+4;
fnuxi4[i] = c;
fnuxi8[i] = c;
fnuxi8[i+4] = c+4;
}
if(debug['v']) {
Bprint(&bso, "inuxi = ");
for(i=0; i<1; i++)
Bprint(&bso, "%d", inuxi1[i]);
Bprint(&bso, " ");
for(i=0; i<2; i++)
Bprint(&bso, "%d", inuxi2[i]);
Bprint(&bso, " ");
for(i=0; i<4; i++)
Bprint(&bso, "%d", inuxi4[i]);
Bprint(&bso, " ");
for(i=0; i<8; i++)
Bprint(&bso, "%d", inuxi8[i]);
Bprint(&bso, "\nfnuxi = ");
for(i=0; i<4; i++)
Bprint(&bso, "%d", fnuxi4[i]);
Bprint(&bso, " ");
for(i=0; i<8; i++)
Bprint(&bso, "%d", fnuxi8[i]);
Bprint(&bso, "\n");
}
Bflush(&bso);
}
int
find1(int32 l, int c)
{
char *p;
int i;
p = (char*)&l;
for(i=0; i<4; i++)
if(*p++ == c)
return i;
return 0;
}
int
find2(int32 l, int c)
{
union {
int32 l;
short p[2];
} u;
short *p;
int i;
u.l = l;
p = u.p;
for(i=0; i<4; i+=2) {
if(((*p >> 8) & 0xff) == c)
return i;
if((*p++ & 0xff) == c)
return i+1;
}
return 0;
}
int32
ieeedtof(Ieee *e)
{
int exp;
int32 v;
if(e->h == 0)
return 0;
exp = (e->h>>20) & ((1L<<11)-1L);
exp -= (1L<<10) - 2L;
v = (e->h & 0xfffffL) << 3;
v |= (e->l >> 29) & 0x7L;
if((e->l >> 28) & 1) {
v++;
if(v & 0x800000L) {
v = (v & 0x7fffffL) >> 1;
exp++;
}
}
if(-148 <= exp && exp <= -126) {
v |= 1<<23;
v >>= -125 - exp;
exp = -126;
}
else if(exp < -148 || exp >= 130)
diag("double fp to single fp overflow: %.17g", ieeedtod(e));
v |= ((exp + 126) & 0xffL) << 23;
v |= e->h & 0x80000000L;
return v;
}
double
ieeedtod(Ieee *ieeep)
{
Ieee e;
double fr;
int exp;
if(ieeep->h & (1L<<31)) {
e.h = ieeep->h & ~(1L<<31);
e.l = ieeep->l;
return -ieeedtod(&e);
}
if(ieeep->l == 0 && ieeep->h == 0)
return 0;
exp = (ieeep->h>>20) & ((1L<<11)-1L);
exp -= (1L<<10) - 2L;
fr = ieeep->l & ((1L<<16)-1L);
fr /= 1L<<16;
fr += (ieeep->l>>16) & ((1L<<16)-1L);
fr /= 1L<<16;
if(exp == -(1L<<10) - 2L) {
fr += (ieeep->h & (1L<<20)-1L);
exp++;
} else
fr += (ieeep->h & (1L<<20)-1L) | (1L<<20);
fr /= 1L<<21;
return ldexp(fr, exp);
}
void
undefsym(Sym *s)
{
int n;
n = imports;
if(s->value != 0)
diag("value != 0 on SXREF");
if(n >= 1<<Rindex)
diag("import index %d out of range", n);
s->value = n<<Roffset;
s->type = SUNDEF;
imports++;
}
void
zerosig(char *sp)
{
Sym *s;
s = lookup(sp, 0);
s->sig = 0;
}
void
readundefs(char *f, int t)
{
int i, n;
Sym *s;
Biobuf *b;
char *l, buf[256], *fields[64];
if(f == nil)
return;
b = Bopen(f, OREAD);
if(b == nil){
diag("could not open %s: %r", f);
errorexit();
}
while((l = Brdline(b, '\n')) != nil){
n = Blinelen(b);
if(n >= sizeof(buf)){
diag("%s: line too long", f);
errorexit();
}
memmove(buf, l, n);
buf[n-1] = '\0';
n = getfields(buf, fields, nelem(fields), 1, " \t\r\n");
if(n == nelem(fields)){
diag("%s: bad format", f);
errorexit();
}
for(i = 0; i < n; i++){
s = lookup(fields[i], 0);
s->type = SXREF;
s->subtype = t;
if(t == SIMPORT)
nimports++;
else
nexports++;
}
}
Bterm(b);
}
int32
Bget4(Biobuf *f)
{
uchar p[4];
if(Bread(f, p, 4) != 4)
return 0;
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}
void
mywhatsys(void)
{
goroot = getgoroot();
goos = getgoos();
goarch = thestring; // ignore $GOARCH - we know who we are
}
int
pathchar(void)
{
return '/';
}
static uchar* hunk;
static uint32 nhunk;
#define NHUNK (10UL<<20)
void*
mal(uint32 n)
{
void *v;
while(n & 7)
n++;
if(n > NHUNK) {
v = malloc(n);
memset(v, 0, n);
return v;
}
if(n > nhunk) {
hunk = malloc(NHUNK);
nhunk = NHUNK;
}
v = hunk;
nhunk -= n;
hunk += n;
memset(v, 0, n);
return v;
}
// Copied from ../gc/subr.c:/^pathtoprefix; must stay in sync.
/*
* Convert raw string to the prefix that will be used in the symbol table.
* Invalid bytes turn into %xx. Right now the only bytes that need
* escaping are %, ., and ", but we escape all control characters too.
*/
static char*
pathtoprefix(char *s)
{
static char hex[] = "0123456789abcdef";
char *p, *r, *w;
int n;
// check for chars that need escaping
n = 0;
for(r=s; *r; r++)
if(*r <= ' ' || *r == '.' || *r == '%' || *r == '"')
n++;
// quick exit
if(n == 0)
return s;
// escape
p = mal((r-s)+1+2*n);
for(r=s, w=p; *r; r++) {
if(*r <= ' ' || *r == '.' || *r == '%' || *r == '"') {
*w++ = '%';
*w++ = hex[(*r>>4)&0xF];
*w++ = hex[*r&0xF];
} else
*w++ = *r;
}
*w = '\0';
return p;
}
int
iconv(Fmt *fp)
{
char *p;
p = va_arg(fp->args, char*);
if(p == nil) {
fmtstrcpy(fp, "<nil>");
return 0;
}
p = pathtoprefix(p);
fmtstrcpy(fp, p);
return 0;
}
void
mangle(char *file)
{
fprint(2, "%s: mangled input file\n", file);
errorexit();
}