src/cmd/ld/symtab.c - go - Git at Google

 // Inferno utils/6l/span.c
 // http://code.google.com/p/inferno-os/source/browse/utils/6l/span.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.

 // Symbol table.

 #include	"l.h"
 #include	"../ld/lib.h"
 #include	"../ld/elf.h"

 static int maxelfstr;

 int
 putelfstr(char *s)
 {
 	int off, n;

 	if(elfstrsize == 0 && s[0] != 0) {
 		// first entry must be empty string
 		putelfstr("");
 	}

 	n = strlen(s)+1;
 	if(elfstrsize+n > maxelfstr) {
 		maxelfstr = 2*(elfstrsize+n+(1<<20));
 		elfstrdat = realloc(elfstrdat, maxelfstr);
 	}
 	off = elfstrsize;
 	elfstrsize += n;
 	memmove(elfstrdat+off, s, n);
 	return off;
 }

 void
 putelfsyment(int off, vlong addr, vlong size, int info, int shndx)
 {
 	switch(thechar) {
 	case '6':
 		LPUT(off);
 		cput(info);
 		cput(0);
 		WPUT(shndx);
 		VPUT(addr);
 		VPUT(size);
 		symsize += ELF64SYMSIZE;
 		break;
 	default:
 		LPUT(off);
 		LPUT(addr);
 		LPUT(size);
 		cput(info);
 		cput(0);
 		WPUT(shndx);
 		symsize += ELF32SYMSIZE;
 		break;
 	}
 }

 void
 putelfsym(Sym *x, char *s, int t, vlong addr, vlong size, int ver, Sym *go)
 {
 	int bind, type, shndx, off;

 	USED(go);
 	switch(t) {
 	default:
 		return;
 	case 'T':
 		type = STT_FUNC;
 		shndx = elftextsh + 0;
 		break;
 	case 'D':
 		type = STT_OBJECT;
 		if((x->type&~SSUB) == SRODATA)
 			shndx = elftextsh + 1;
 		else
 			shndx = elftextsh + 2;
 		break;
 	case 'B':
 		type = STT_OBJECT;
 		shndx = elftextsh + 3;
 		break;
 	}
 	bind = ver ? STB_LOCAL : STB_GLOBAL;
 	off = putelfstr(s);
 	putelfsyment(off, addr, size, (bind<<4)|(type&0xf), shndx);
 }

 void
 asmelfsym(void)
 {
 	// the first symbol entry is reserved
 	putelfsyment(0, 0, 0, (STB_LOCAL<<4)|STT_NOTYPE, 0);
 	genasmsym(putelfsym);
 }

 void
 putplan9sym(Sym *x, char *s, int t, vlong addr, vlong size, int ver, Sym *go)
 {
 	int i;

 	USED(go);
 	USED(ver);
 	USED(size);
 	USED(x);
 	switch(t) {
 	case 'T':
 	case 'L':
 	case 'D':
 	case 'B':
 		if(ver)
 			t += 'a' - 'A';
 	case 'a':
 	case 'p':
 	case 'f':
 	case 'z':
 	case 'Z':
 	case 'm':
 		lputb(addr);
 		cput(t+0x80); /* 0x80 is variable length */

 		if(t == 'z' || t == 'Z') {
 			cput(s[0]);
 			for(i=1; s[i] != 0 || s[i+1] != 0; i += 2) {
 				cput(s[i]);
 				cput(s[i+1]);
 			}
 			cput(0);
 			cput(0);
 			i++;
 		} else {
 			/* skip the '<' in filenames */
 			if(t == 'f')
 				s++;
 			for(i=0; s[i]; i++)
 				cput(s[i]);
 			cput(0);
 		}
 		symsize += 4 + 1 + i + 1;
 		break;
 	default:
 		return;
 	};
 }

 void
 asmplan9sym(void)
 {
 	genasmsym(putplan9sym);
 }

 static Sym *symt;

 static void
 scput(int b)
 {
 	uchar *p;

 	symgrow(symt, symt->size+1);
 	p = symt->p + symt->size;
 	*p = b;
 	symt->size++;
 }

 static void
 slputb(int32 v)
 {
 	uchar *p;

 	symgrow(symt, symt->size+4);
 	p = symt->p + symt->size;
 	*p++ = v>>24;
 	*p++ = v>>16;
 	*p++ = v>>8;
 	*p = v;
 	symt->size += 4;
 }

 void
 wputl(ushort w)
 {
 	cput(w);
 	cput(w>>8);
 }

 void
 wputb(ushort w)
 {
 	cput(w>>8);
 	cput(w);
 }

 void
 lputb(int32 l)
 {
 	cput(l>>24);
 	cput(l>>16);
 	cput(l>>8);
 	cput(l);
 }

 void
 lputl(int32 l)
 {
 	cput(l);
 	cput(l>>8);
 	cput(l>>16);
 	cput(l>>24);
 }

 void
 vputb(uint64 v)
 {
 	lputb(v>>32);
 	lputb(v);
 }

 void
 vputl(uint64 v)
 {
 	lputl(v);
 	lputl(v >> 32);
 }

 void
 putsymb(Sym *s, char *name, int t, vlong v, vlong size, int ver, Sym *typ)
 {
 	int i, f, l;
 	Reloc *rel;

 	USED(size);
 	if(t == 'f')
 		name++;
 	l = 4;
 //	if(!debug['8'])
 //		l = 8;
 	if(s != nil) {
 		rel = addrel(symt);
 		rel->siz = l + Rbig;
 		rel->sym = s;
 		rel->type = D_ADDR;
 		rel->off = symt->size;
 		v = 0;
 	}
 	if(l == 8)
 		slputb(v>>32);
 	slputb(v);
 	if(ver)
 		t += 'a' - 'A';
 	scput(t+0x80);			/* 0x80 is variable length */

 	if(t == 'Z' || t == 'z') {
 		scput(name[0]);
 		for(i=1; name[i] != 0 || name[i+1] != 0; i += 2) {
 			scput(name[i]);
 			scput(name[i+1]);
 		}
 		scput(0);
 		scput(0);
 	}
 	else {
 		for(i=0; name[i]; i++)
 			scput(name[i]);
 		scput(0);
 	}
 	if(typ) {
 		if(!typ->reachable)
 			diag("unreachable type %s", typ->name);
 		rel = addrel(symt);
 		rel->siz = l;
 		rel->sym = typ;
 		rel->type = D_ADDR;
 		rel->off = symt->size;
 	}
 	if(l == 8)
 		slputb(0);
 	slputb(0);

 	if(debug['n']) {
 		if(t == 'z' || t == 'Z') {
 			Bprint(&bso, "%c %.8llux ", t, v);
 			for(i=1; name[i] != 0 || name[i+1] != 0; i+=2) {
 				f = ((name[i]&0xff) << 8) | (name[i+1]&0xff);
 				Bprint(&bso, "/%x", f);
 			}
 			Bprint(&bso, "\n");
 			return;
 		}
 		if(ver)
 			Bprint(&bso, "%c %.8llux %s<%d> %s\n", t, v, s->name, ver, typ ? typ->name : "");
 		else
 			Bprint(&bso, "%c %.8llux %s %s\n", t, v, s->name, typ ? typ->name : "");
 	}
 }

 void
 symtab(void)
 {
 	Sym *s;

 	dosymtype();

 	// Define these so that they'll get put into the symbol table.
 	// data.c:/^address will provide the actual values.
 	xdefine("text", STEXT, 0);
 	xdefine("etext", STEXT, 0);
 	xdefine("rodata", SRODATA, 0);
 	xdefine("erodata", SRODATA, 0);
 	xdefine("noptrdata", SNOPTRDATA, 0);
 	xdefine("enoptrdata", SNOPTRDATA, 0);
 	xdefine("data", SDATA, 0);
 	xdefine("edata", SDATA, 0);
 	xdefine("bss", SBSS, 0);
 	xdefine("ebss", SBSS, 0);
 	xdefine("noptrbss", SNOPTRBSS, 0);
 	xdefine("enoptrbss", SNOPTRBSS, 0);
 	xdefine("end", SBSS, 0);
 	xdefine("epclntab", SRODATA, 0);
 	xdefine("esymtab", SRODATA, 0);

 	// pseudo-symbols to mark locations of type, string, and go string data.
 	s = lookup("type.*", 0);
 	s->type = STYPE;
 	s->size = 0;
 	s->reachable = 1;

 	s = lookup("go.string.*", 0);
 	s->type = SGOSTRING;
 	s->size = 0;
 	s->reachable = 1;

 	symt = lookup("symtab", 0);
 	symt->type = SSYMTAB;
 	symt->size = 0;
 	symt->reachable = 1;

 	// assign specific types so that they sort together.
 	// within a type they sort by size, so the .* symbols
 	// just defined above will be first.
 	// hide the specific symbols.
 	for(s = allsym; s != S; s = s->allsym) {
 		if(!s->reachable || s->special || s->type != SRODATA)
 			continue;
 		if(strncmp(s->name, "type.", 5) == 0) {
 			s->type = STYPE;
 			s->hide = 1;
 		}
 		if(strncmp(s->name, "go.string.", 10) == 0) {
 			s->type = SGOSTRING;
 			s->hide = 1;
 		}
 	}

 	if(debug['s'])
 		return;
 	genasmsym(putsymb);
 }
	// Inferno utils/6l/span.c
	// http://code.google.com/p/inferno-os/source/browse/utils/6l/span.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.

	// Symbol table.

	#include "l.h"
	#include "../ld/lib.h"
	#include "../ld/elf.h"

	static int maxelfstr;

	int
	putelfstr(char *s)
	{
	int off, n;

	if(elfstrsize == 0 && s[0] != 0) {
	// first entry must be empty string
	putelfstr("");
	}

	n = strlen(s)+1;
	if(elfstrsize+n > maxelfstr) {
	maxelfstr = 2*(elfstrsize+n+(1<<20));
	elfstrdat = realloc(elfstrdat, maxelfstr);
	}
	off = elfstrsize;
	elfstrsize += n;
	memmove(elfstrdat+off, s, n);
	return off;
	}

	void
	putelfsyment(int off, vlong addr, vlong size, int info, int shndx)
	{
	switch(thechar) {
	case '6':
	LPUT(off);
	cput(info);
	cput(0);
	WPUT(shndx);
	VPUT(addr);
	VPUT(size);
	symsize += ELF64SYMSIZE;
	break;
	default:
	LPUT(off);
	LPUT(addr);
	LPUT(size);
	cput(info);
	cput(0);
	WPUT(shndx);
	symsize += ELF32SYMSIZE;
	break;
	}
	}

	void
	putelfsym(Sym x, char s, int t, vlong addr, vlong size, int ver, Sym *go)
	{
	int bind, type, shndx, off;

	USED(go);
	switch(t) {
	default:
	return;
	case 'T':
	type = STT_FUNC;
	shndx = elftextsh + 0;
	break;
	case 'D':
	type = STT_OBJECT;
	if((x->type&~SSUB) == SRODATA)
	shndx = elftextsh + 1;
	else
	shndx = elftextsh + 2;
	break;
	case 'B':
	type = STT_OBJECT;
	shndx = elftextsh + 3;
	break;
	}
	bind = ver ? STB_LOCAL : STB_GLOBAL;
	off = putelfstr(s);
	putelfsyment(off, addr, size, (bind<<4)\|(type&0xf), shndx);
	}

	void
	asmelfsym(void)
	{
	// the first symbol entry is reserved
	putelfsyment(0, 0, 0, (STB_LOCAL<<4)\|STT_NOTYPE, 0);
	genasmsym(putelfsym);
	}

	void
	putplan9sym(Sym x, char s, int t, vlong addr, vlong size, int ver, Sym *go)
	{
	int i;

	USED(go);
	USED(ver);
	USED(size);
	USED(x);
	switch(t) {
	case 'T':
	case 'L':
	case 'D':
	case 'B':
	if(ver)
	t += 'a' - 'A';
	case 'a':
	case 'p':
	case 'f':
	case 'z':
	case 'Z':
	case 'm':
	lputb(addr);
	cput(t+0x80); /* 0x80 is variable length */

	if(t == 'z' \|\| t == 'Z') {
	cput(s[0]);
	for(i=1; s[i] != 0 \|\| s[i+1] != 0; i += 2) {
	cput(s[i]);
	cput(s[i+1]);
	}
	cput(0);
	cput(0);
	i++;
	} else {
	/* skip the '<' in filenames */
	if(t == 'f')
	s++;
	for(i=0; s[i]; i++)
	cput(s[i]);
	cput(0);
	}
	symsize += 4 + 1 + i + 1;
	break;
	default:
	return;
	};
	}

	void
	asmplan9sym(void)
	{
	genasmsym(putplan9sym);
	}

	static Sym *symt;

	static void
	scput(int b)
	{
	uchar *p;

	symgrow(symt, symt->size+1);
	p = symt->p + symt->size;
	*p = b;
	symt->size++;
	}

	static void
	slputb(int32 v)
	{
	uchar *p;

	symgrow(symt, symt->size+4);
	p = symt->p + symt->size;
	*p++ = v>>24;
	*p++ = v>>16;
	*p++ = v>>8;
	*p = v;
	symt->size += 4;
	}

	void
	wputl(ushort w)
	{
	cput(w);
	cput(w>>8);
	}

	void
	wputb(ushort w)
	{
	cput(w>>8);
	cput(w);
	}

	void
	lputb(int32 l)
	{
	cput(l>>24);
	cput(l>>16);
	cput(l>>8);
	cput(l);
	}

	void
	lputl(int32 l)
	{
	cput(l);
	cput(l>>8);
	cput(l>>16);
	cput(l>>24);
	}

	void
	vputb(uint64 v)
	{
	lputb(v>>32);
	lputb(v);
	}

	void
	vputl(uint64 v)
	{
	lputl(v);
	lputl(v >> 32);
	}

	void
	putsymb(Sym s, char name, int t, vlong v, vlong size, int ver, Sym *typ)
	{
	int i, f, l;
	Reloc *rel;

	USED(size);
	if(t == 'f')
	name++;
	l = 4;
	// if(!debug['8'])
	// l = 8;
	if(s != nil) {
	rel = addrel(symt);
	rel->siz = l + Rbig;
	rel->sym = s;
	rel->type = D_ADDR;
	rel->off = symt->size;
	v = 0;
	}
	if(l == 8)
	slputb(v>>32);
	slputb(v);
	if(ver)
	t += 'a' - 'A';
	scput(t+0x80); /* 0x80 is variable length */

	if(t == 'Z' \|\| t == 'z') {
	scput(name[0]);
	for(i=1; name[i] != 0 \|\| name[i+1] != 0; i += 2) {
	scput(name[i]);
	scput(name[i+1]);
	}
	scput(0);
	scput(0);
	}
	else {
	for(i=0; name[i]; i++)
	scput(name[i]);
	scput(0);
	}
	if(typ) {
	if(!typ->reachable)
	diag("unreachable type %s", typ->name);
	rel = addrel(symt);
	rel->siz = l;
	rel->sym = typ;
	rel->type = D_ADDR;
	rel->off = symt->size;
	}
	if(l == 8)
	slputb(0);
	slputb(0);

	if(debug['n']) {
	if(t == 'z' \|\| t == 'Z') {
	Bprint(&bso, "%c %.8llux ", t, v);
	for(i=1; name[i] != 0 \|\| name[i+1] != 0; i+=2) {
	f = ((name[i]&0xff) << 8) \| (name[i+1]&0xff);
	Bprint(&bso, "/%x", f);
	}
	Bprint(&bso, "\n");
	return;
	}
	if(ver)
	Bprint(&bso, "%c %.8llux %s<%d> %s\n", t, v, s->name, ver, typ ? typ->name : "");
	else
	Bprint(&bso, "%c %.8llux %s %s\n", t, v, s->name, typ ? typ->name : "");
	}
	}

	void
	symtab(void)
	{
	Sym *s;

	dosymtype();

	// Define these so that they'll get put into the symbol table.
	// data.c:/^address will provide the actual values.
	xdefine("text", STEXT, 0);
	xdefine("etext", STEXT, 0);
	xdefine("rodata", SRODATA, 0);
	xdefine("erodata", SRODATA, 0);
	xdefine("noptrdata", SNOPTRDATA, 0);
	xdefine("enoptrdata", SNOPTRDATA, 0);
	xdefine("data", SDATA, 0);
	xdefine("edata", SDATA, 0);
	xdefine("bss", SBSS, 0);
	xdefine("ebss", SBSS, 0);
	xdefine("noptrbss", SNOPTRBSS, 0);
	xdefine("enoptrbss", SNOPTRBSS, 0);
	xdefine("end", SBSS, 0);
	xdefine("epclntab", SRODATA, 0);
	xdefine("esymtab", SRODATA, 0);

	// pseudo-symbols to mark locations of type, string, and go string data.
	s = lookup("type.*", 0);
	s->type = STYPE;
	s->size = 0;
	s->reachable = 1;

	s = lookup("go.string.*", 0);
	s->type = SGOSTRING;
	s->size = 0;
	s->reachable = 1;

	symt = lookup("symtab", 0);
	symt->type = SSYMTAB;
	symt->size = 0;
	symt->reachable = 1;

	// assign specific types so that they sort together.
	// within a type they sort by size, so the .* symbols
	// just defined above will be first.
	// hide the specific symbols.
	for(s = allsym; s != S; s = s->allsym) {
	if(!s->reachable \|\| s->special \|\| s->type != SRODATA)
	continue;
	if(strncmp(s->name, "type.", 5) == 0) {
	s->type = STYPE;
	s->hide = 1;
	}
	if(strncmp(s->name, "go.string.", 10) == 0) {
	s->type = SGOSTRING;
	s->hide = 1;
	}
	}

	if(debug['s'])
	return;
	genasmsym(putsymb);
	}