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quakeforge/tools/qfcc/source/linker.c

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/*
link.c
qc object file linking
Copyright (C) 2002 Bill Currie <bill@taniwha.org>
Author: Bill Currie <bill@taniwha.org>
Date: 2002/7/3
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_IO_H
# include <io.h>
#endif
#include <stdlib.h>
#include <stdarg.h>
#include <fcntl.h>
#include "QF/dstring.h"
#include "QF/hash.h"
#include "QF/pakfile.h"
#include "def.h"
#include "emit.h"
#include "expr.h"
#include "immediate.h"
#include "linker.h"
#include "obj_file.h"
#include "options.h"
#include "qfcc.h"
#include "reloc.h"
#include "strpool.h"
#include "type.h"
#define Xgroup(X)\
typedef struct {\
qfo_##X##_t *X##s;\
int num_##X##s;\
int max_##X##s;\
} X##group_t;
Xgroup(def) // defgroup_t
Xgroup(reloc) // relocgroup_t
Xgroup(func) // funcgroup_t
static hashtab_t *extern_defs;
static hashtab_t *defined_defs;
static hashtab_t *field_defs;
static codespace_t *code;
static defspace_t *data;
static defspace_t *far_data;
static defspace_t *entity;
static strpool_t *strings;
static strpool_t *type_strings;
static relocgroup_t relocs, final_relocs;
static defgroup_t global_defs, local_defs, fields, defs;
static funcgroup_t funcs;
static struct {
pr_lineno_t *lines;
int num_lines;
int max_lines;
} lines;
static int code_base;
static int data_base;
static int far_data_base;
static int entity_base;
static int reloc_base;
static int func_base;
static int line_base;
#define DATA(x) (data->data + (x))
#define STRING(x) (strings->strings + (x))
#define TYPE_STRING(x) (type_strings->strings + (x))
#define Xgroup_add(X)\
static void \
X##group_add_##X##s (X##group_t *X##group, qfo_##X##_t *X##s, int num_##X##s)\
{\
if (X##group->num_##X##s + num_##X##s > X##group->max_##X##s) {\
X##group->max_##X##s = RUP (X##group->num_##X##s + num_##X##s, 16384);\
X##group->X##s = realloc (X##group->X##s,\
X##group->max_##X##s * sizeof (qfo_##X##_t));\
}\
memcpy (X##group->X##s + X##group->num_##X##s, X##s,\
num_##X##s * sizeof (qfo_##X##_t));\
X##group->num_##X##s += num_##X##s;\
}
Xgroup_add(def) // defgroup_add_defs
Xgroup_add(reloc) // relocgroup_add_relocs
Xgroup_add(func) // funcgroup_add_funcs
static void __attribute__ ((format (printf, 2, 3)))
def_error (qfo_def_t *def, const char *fmt, ...)
{
va_list args;
static dstring_t *string;
if (!string)
string = dstring_new ();
va_start (args, fmt);
dvsprintf (string, fmt, args);
va_end (args);
pr.source_file = def->file;
pr.source_line = def->line;
pr.strings = strings;
error (0, "%s", string->str);
}
static const char *
defs_get_key (void *_def, void *unused)
{
qfo_def_t *def = (qfo_def_t *) _def;
return STRING (def->name);
}
static void
add_strings (qfo_t *qfo)
{
int i;
for (i = 0; i < qfo->strings_size; i += strlen (qfo->strings + i) + 1)
strpool_addstr (strings, qfo->strings + i);
}
static void
add_relocs (qfo_t *qfo)
{
int i;
relocgroup_add_relocs (&relocs, qfo->relocs, qfo->num_relocs);
for (i = reloc_base; i < relocs.num_relocs; i++) {
qfo_reloc_t *reloc = relocs.relocs + i;
switch ((reloc_type)reloc->type) {
case rel_none:
break;
case rel_op_a_def:
case rel_op_b_def:
case rel_op_c_def:
reloc->ofs += code_base;
break;
case rel_op_a_op:
case rel_op_b_op:
case rel_op_c_op:
// these are relative and fixed up before the .qfo is written
break;
case rel_def_op:
reloc->ofs += data_base;
reloc->def += code_base;
break;
case rel_def_func:
reloc->ofs += data_base;
reloc->def += func_base;
DATA (reloc->ofs)->func_var = reloc->def + 1;
break;
case rel_def_def:
reloc->ofs += data_base;
break;
case rel_def_string:
reloc->ofs += data_base;
DATA (reloc->ofs)->string_var =
strpool_addstr (strings,
qfo->strings + DATA (reloc->ofs)->string_var);
break;
case rel_def_field:
//FIXME more?
reloc->ofs += data_base;
break;
}
}
}
static void
process_def (qfo_def_t *def)
{
qfo_def_t *d;
if (def->flags & QFOD_EXTERNAL) {
if ((d = Hash_Find (defined_defs, STRING (def->name)))) {
def->ofs = d->ofs;
def->flags = d->flags;
Hash_Add (defined_defs, def);
} else {
Hash_Add (extern_defs, def);
}
} else if (def->flags & QFOD_GLOBAL) {
if ((d = Hash_Find (defined_defs, STRING (def->name)))) {
if (d->flags & QFOD_SYSTEM) {
int i, size;
if (d->full_type != def->full_type) {
def_error (def, "type mismatch `%s' `%s'",
TYPE_STRING (def->full_type),
TYPE_STRING (d->full_type));
def_error (d, "previous definition");
return;
}
d->flags &= ~QFOD_SYSTEM;
d->flags |= def->flags & (QFOD_INITIALIZED | QFOD_CONSTANT);
size = type_size (parse_type (TYPE_STRING (d->full_type)));
memcpy (DATA (d->ofs), DATA (def->ofs),
size * sizeof (pr_type_t));
for (i = 0; i < relocs.num_relocs; i++) {
qfo_reloc_t *reloc = relocs.relocs + i;
if (reloc->type >= rel_def_op
&& reloc->type <= rel_def_field)
if (reloc->ofs == def->ofs)
reloc->ofs = d->ofs;
}
def->ofs = d->ofs;
def->flags = d->flags;
} else {
def_error (def, "%s redefined", STRING (def->name));
def_error (d, "previous definition");
}
}
while ((d = Hash_Del (extern_defs, STRING (def->name)))) {
Hash_Add (defined_defs, d);
if (d->full_type != def->full_type) {
def_error (def, "type mismatch `%s' `%s'",
TYPE_STRING (def->full_type),
TYPE_STRING (d->full_type));
def_error (d, "previous definition");
continue;
}
d->ofs = def->ofs;
d->flags = def->flags;
}
Hash_Add (defined_defs, def);
}
}
static void
process_field (qfo_def_t *def)
{
qfo_def_t *field_def;
pr_type_t *var = DATA (def->ofs);
if ((field_def = Hash_Find (field_defs, STRING (def->name)))) {
def_error (def, "%s redefined", STRING (def->name));
def_error (field_def, "previous definition");
}
defgroup_add_defs (&fields, def, 1);
field_def = fields.defs + fields.num_defs - 1;
field_def->ofs = var->integer_var + entity_base;
Hash_Add (field_defs, field_def);
}
static void
fixup_def (qfo_t *qfo, qfo_def_t *def, int def_num)
{
int i;
qfo_reloc_t *reloc;
qfo_func_t *func;
def->full_type = strpool_addstr (type_strings,
qfo->types + def->full_type);
def->name = strpool_addstr (strings, qfo->strings + def->name);
def->relocs += reloc_base;
for (i = 0, reloc = relocs.relocs + def->relocs;
i < def->num_relocs;
i++, reloc++)
reloc->def = def_num;
def->file = strpool_addstr (strings, qfo->strings + def->file);
if ((def->flags & (QFOD_LOCAL | QFOD_ABSOLUTE)))
return;
if (!(def->flags & QFOD_EXTERNAL)) {
def->ofs += data_base;
if (def->flags & QFOD_INITIALIZED) {
pr_type_t *var = DATA (def->ofs);
switch (def->basic_type) {
case ev_func:
func = funcs.funcs + var->func_var - 1;
func->def = def_num;
break;
case ev_field:
process_field (def);
break;
default:
break;
}
}
}
process_def (def);
}
static void
add_defs (qfo_t *qfo)
{
qfo_def_t *s, *e;
for (s = e = qfo->defs; s - qfo->defs < qfo->num_defs; s = e) {
int def_num = global_defs.num_defs;
qfo_def_t *d;
while (e - qfo->defs < qfo->num_defs && !(e->flags & QFOD_LOCAL))
e++;
defgroup_add_defs (&global_defs, s, e - s);
for (d = global_defs.defs + def_num; def_num < global_defs.num_defs;
d++, def_num++)
fixup_def (qfo, d, def_num);
while (e - qfo->defs < qfo->num_defs && (e->flags & QFOD_LOCAL))
e++;
}
}
static void
add_funcs (qfo_t *qfo)
{
int i;
funcgroup_add_funcs (&funcs, qfo->funcs, qfo->num_funcs);
for (i = func_base; i < funcs.num_funcs; i++) {
qfo_func_t *func = funcs.funcs + i;
func->name = strpool_addstr (strings, qfo->strings + func->name);
func->file = strpool_addstr (strings, qfo->strings + func->file);
if (func->code)
func->code += code_base;
if (func->num_local_defs) {
int def_num = local_defs.num_defs;
qfo_def_t *d;
defgroup_add_defs (&local_defs, qfo->defs + func->local_defs,
func->num_local_defs);
func->local_defs = def_num;
for (d = local_defs.defs + def_num; def_num < local_defs.num_defs;
d++, def_num++)
fixup_def (qfo, d, def_num);
}
if (func->line_info)
func->line_info += line_base;
func->relocs += reloc_base;
}
}
static void
add_lines (qfo_t *qfo)
{
int i;
if (lines.num_lines + qfo->num_lines > lines.max_lines) {
lines.max_lines = RUP (lines.num_lines + qfo->num_lines, 16384);
lines.lines = realloc (lines.lines,
lines.max_lines * sizeof (pr_lineno_t));
}
lines.num_lines += qfo->num_lines;
memcpy (lines.lines + line_base, qfo->lines,
qfo->num_lines * sizeof (pr_lineno_t));
for (i = line_base; i < lines.num_lines; i++) {
pr_lineno_t *line = lines.lines + i;
if (line->line)
line->fa.addr += code_base;
else
line->fa.func += func_base;
}
}
static void
fixup_relocs ()
{
qfo_reloc_t *reloc;
qfo_def_t *def, *field_def;
qfo_func_t *func;
int i;
for (i = 0; i < final_relocs.num_relocs; i++) {
reloc = final_relocs.relocs + i;
def = 0;
switch ((reloc_type)reloc->type) {
case rel_none:
break;
case rel_op_a_def:
case rel_op_b_def:
case rel_op_c_def:
case rel_def_def:
case rel_def_field:
def = defs.defs + reloc->def;
if (def->flags & (QFOD_EXTERNAL | QFOD_LOCAL | QFOD_ABSOLUTE))
continue;
break;
case rel_def_op:
case rel_op_a_op:
case rel_op_b_op:
case rel_op_c_op:
case rel_def_func:
case rel_def_string:
break;
}
switch ((reloc_type)reloc->type) {
case rel_none:
break;
case rel_op_a_def:
code->code[reloc->ofs].a = def->ofs;
break;
case rel_op_b_def:
code->code[reloc->ofs].b = def->ofs;
break;
case rel_op_c_def:
code->code[reloc->ofs].c = def->ofs;
break;
case rel_op_a_op:
case rel_op_b_op:
case rel_op_c_op:
break;
case rel_def_op:
DATA (reloc->ofs)->integer_var = reloc->def;
break;
case rel_def_def:
DATA (reloc->ofs)->integer_var = def->ofs;
break;
case rel_def_func:
break;
case rel_def_string:
break;
case rel_def_field:
field_def = Hash_Find (field_defs, STRING (def->name));
if (field_def) // null if not initialized
DATA (reloc->ofs)->integer_var = field_def->ofs;
break;
}
}
for (i = 0; i < defs.num_defs; i++) {
def = defs.defs + i;
if (def->basic_type == ev_func
&& (def->flags & QFOD_INITIALIZED)
&& !(def->flags & (QFOD_LOCAL | QFOD_EXTERNAL | QFOD_ABSOLUTE))) {
func = funcs.funcs + DATA (def->ofs)->func_var - 1;
func->def = i;
}
}
}
static void
move_def (hashtab_t *deftab, qfo_def_t *d)
{
qfo_def_t *def;
int def_num = defs.num_defs;
int j;
defgroup_add_defs (&defs, d, 1);
def = defs.defs + def_num;
def->relocs = final_relocs.num_relocs;
relocgroup_add_relocs (&final_relocs, relocs.relocs + d->relocs,
d->num_relocs);
for (j = 0; j < d->num_relocs; j++) {
relocs.relocs[d->relocs + j].type = rel_none;
final_relocs.relocs[def->relocs + j].def = def_num;
}
if ((d->flags & QFOD_CONSTANT) && d->basic_type == ev_func) {
qfo_func_t *func;
func = funcs.funcs + DATA (d->ofs)->func_var - 1;
func->def = def_num;
}
if (deftab) {
while ((d = Hash_Del (deftab, STRING (def->name)))) {
int def_relocs;
relocgroup_add_relocs (&final_relocs, relocs.relocs + d->relocs,
d->num_relocs);
def_relocs = def->relocs + def->num_relocs;
def->num_relocs += d->num_relocs;
for (j = 0; j < d->num_relocs; j++) {
relocs.relocs[d->relocs + j].type = rel_none;
final_relocs.relocs[def_relocs + j].def = def_num;
}
memset (d, 0, sizeof (*d));
}
}
}
static void
merge_defgroups (void)
{
int local_base, i, j;
qfo_def_t *def, *d;
qfo_func_t *func;
static qfo_def_t null_def;
for (i = 0; i < global_defs.num_defs; i++) {
const char *name;
def = global_defs.defs + i;
if (memcmp (def, &null_def, sizeof (*def)) == 0)
continue;
name = STRING (def->name);
if ((d = Hash_Del (defined_defs, name)))
move_def (defined_defs, d);
else if ((d = Hash_Del (extern_defs, name)))
move_def (extern_defs, d);
else if (!(def->flags & (QFOD_GLOBAL | QFOD_EXTERNAL)))
move_def (0, def);
}
local_base = defs.num_defs;
for (i = 0; i < local_defs.num_defs; i++) {
move_def (0, local_defs.defs + i);
}
for (i = 0; i < funcs.num_funcs; i++) {
int r = final_relocs.num_relocs;
func = funcs.funcs + i;
func->local_defs += local_base;
relocgroup_add_relocs (&final_relocs, relocs.relocs + func->relocs,
func->num_relocs);
for (j = 0; j < func->num_relocs; j++)
relocs.relocs[func->relocs + j].type = rel_none;
func->relocs = r;
}
for (i = 0; i < relocs.num_relocs; i = j) {
j = i;
while (j < relocs.num_relocs && relocs.relocs[j].type != rel_none)
j++;
relocgroup_add_relocs (&final_relocs, relocs.relocs + i, j - i);
while (j < relocs.num_relocs && relocs.relocs[j].type == rel_none)
j++;
}
}
static void
define_def (const char *name, etype_t basic_type, const char *full_type, int v)
{
qfo_def_t d;
pr_type_t val;
val.integer_var = v;
memset (&d, 0, sizeof (d));
d.basic_type = basic_type;
d.full_type = strpool_addstr (type_strings, full_type);
d.name = strpool_addstr (strings, name);
d.ofs = data->size;
d.flags = QFOD_GLOBAL;
if (basic_type == ev_field) {
d.relocs = relocs.num_relocs;
d.num_relocs = 1;
}
defspace_adddata (data, &val, 1);
defgroup_add_defs (&global_defs, &d, 1);
process_def (global_defs.defs + global_defs.num_defs - 1);
if (basic_type == ev_field) {
int def_num = global_defs.num_defs - 1;
qfo_def_t *def = global_defs.defs + def_num;
qfo_reloc_t rel = {def->ofs, rel_def_field, def_num};
relocgroup_add_relocs (&relocs, &rel, 1);
process_field (def);
}
}
void
linker_begin (void)
{
extern_defs = Hash_NewTable (16381, defs_get_key, 0, 0);
defined_defs = Hash_NewTable (16381, defs_get_key, 0, 0);
field_defs = Hash_NewTable (16381, defs_get_key, 0, 0);
code = codespace_new ();
data = new_defspace ();
far_data = new_defspace ();
entity = new_defspace ();
strings = strpool_new ();
type_strings = strpool_new ();
pr.strings = strings;
}
void
linker_add_qfo (qfo_t *qfo)
{
code_base = code->size;
data_base = data->size;
far_data_base = far_data->size;
reloc_base = relocs.num_relocs;
func_base = funcs.num_funcs;
line_base = lines.num_lines;
entity_base = entity->size;
codespace_addcode (code, qfo->code, qfo->code_size);
defspace_adddata (data, qfo->data, qfo->data_size);
defspace_adddata (far_data, qfo->far_data, qfo->far_data_size);
defspace_adddata (entity, 0, qfo->entity_fields);
add_strings (qfo);
add_relocs (qfo);
add_funcs (qfo);
add_defs (qfo);
add_lines (qfo);
}
int
linker_add_object_file (const char *filename)
{
qfo_t *qfo;
qfo = qfo_open (filename);
if (!qfo)
return 1;
if (options.verbosity >= 2)
puts (filename);
linker_add_qfo (qfo);
qfo_delete (qfo);
return 0;
}
int
linker_add_lib (const char *libname)
{
pack_t *pack = pack_open (libname);
int i, j;
int did_something;
if (!pack)
return 1;
do {
did_something = 0;
for (i = 0; i < pack->numfiles; i++) {
QFile *f;
qfo_t *qfo;
f = Qsubopen (libname, pack->files[i].filepos,
pack->files[i].filelen, 1);
qfo = qfo_read (f);
Qclose (f);
if (!qfo)
return 1;
for (j = 0; j < qfo->num_defs; j++) {
qfo_def_t *def = qfo->defs + j;
if ((def->flags & QFOD_GLOBAL)
&& !(def->flags & QFOD_EXTERNAL)
&& Hash_Find (extern_defs, qfo->strings + def->name)) {
if (options.verbosity >= 2)
printf ("adding %s\n", pack->files[i].name);
linker_add_qfo (qfo);
did_something = 1;
break;
}
}
qfo_delete (qfo);
}
} while (did_something);
pack_del (pack);
return 0;
}
qfo_t *
linker_finish (void)
{
qfo_def_t **undef_defs, **def;
qfo_t *qfo;
if (!options.partial_link) {
int did_self = 0, did_this = 0;
undef_defs = (qfo_def_t **) Hash_GetList (extern_defs);
for (def = undef_defs; *def; def++) {
const char *name = STRING ((*def)->name);
if (strcmp (name, ".self") == 0 && !did_self) {
define_def (".self", ev_entity, "E", 0);
did_self = 1;
} else if (strcmp (name, ".this") == 0 && !did_this) {
entity_base = 0;
define_def (".this", ev_field, "F@", entity->size);
defspace_adddata (entity, 0, 1);
did_this = 1;
}
}
free (undef_defs);
undef_defs = (qfo_def_t **) Hash_GetList (extern_defs);
for (def = undef_defs; *def; def++) {
if ((*def)->num_relocs) {
def_error (*def, "undefined symbol %s", STRING ((*def)->name));
}
}
free (undef_defs);
if (pr.error_count)
return 0;
}
merge_defgroups ();
fixup_relocs ();
qfo = qfo_new ();
qfo_add_code (qfo, code->code, code->size);
qfo_add_data (qfo, data->data, data->size);
qfo_add_far_data (qfo, far_data->data, far_data->size);
qfo_add_strings (qfo, strings->strings, strings->size);
qfo_add_relocs (qfo, final_relocs.relocs, final_relocs.num_relocs);
qfo_add_defs (qfo, defs.defs, defs.num_defs);
qfo_add_funcs (qfo, funcs.funcs, funcs.num_funcs);
qfo_add_lines (qfo, lines.lines, lines.num_lines);
qfo_add_types (qfo, type_strings->strings, type_strings->size);
qfo->entity_fields = entity->size;
return qfo;
}
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