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quakeforge/tools/qfcc/source/def.c
Bill Currie d8a5d6745f Add a param flag to defs. 
It is necessary to know if a def is a function parameter so it can be
treated as initialized by the flow analyzer. The support for the flag in
object files is, at this stage, purely for debugging purposes.
2012-11-20 17:50:59 +09:00

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/*
def.c
def management and symbol tables
Copyright (C) 2002 Bill Currie <bill@taniwha.org>
Copyright (C) 1996-1997 Id Software, Inc.
Author: Bill Currie <bill@taniwha.org>
Date: 2002/06/09
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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include <QF/hash.h>
#include <QF/sys.h>
#include <QF/va.h>
#include "qfcc.h"
#include "def.h"
#include "defspace.h"
#include "diagnostic.h"
#include "emit.h"
#include "expr.h"
#include "function.h"
#include "options.h"
#include "reloc.h"
#include "strpool.h"
#include "struct.h"
#include "symtab.h"
#include "type.h"
#include "value.h"
static def_t *free_defs;
static void
set_storage_bits (def_t *def, storage_class_t storage)
{
switch (storage) {
case st_system:
def->system = 1;
// fall through
case st_global:
def->global = 1;
def->external = 0;
def->local = 0;
def->param = 0;
break;
case st_extern:
def->global = 1;
def->external = 1;
def->local = 0;
def->param = 0;
break;
case st_static:
def->external = 0;
def->global = 0;
def->local = 0;
def->param = 0;
break;
case st_local:
def->external = 0;
def->global = 0;
def->local = 1;
def->param = 0;
break;
case st_param:
def->external = 0;
def->global = 0;
def->local = 1;
def->param = 1;
break;
}
def->initialized = 0;
}
def_t *
new_def (const char *name, type_t *type, defspace_t *space,
storage_class_t storage)
{
def_t *def;
ALLOC (16384, def_t, defs, def);
def->return_addr = __builtin_return_address (0);
def->name = name ? save_string (name) : 0;
def->type = type;
def->file = pr.source_file;
def->line = pr.source_line;
set_storage_bits (def, storage);
if (space) {
def->space = space;
*space->def_tail = def;
space->def_tail = &def->next;
}
if (!type)
return def;
if (!space && storage != st_extern)
internal_error (0, "non-external def with no storage space");
if (storage != st_extern) {
int size = type_size (type);
if (!size) {
error (0, "%s has incomplete type", name);
size = 1;
}
def->offset = defspace_alloc_loc (space, size);
}
return def;
}
def_t *
alias_def (def_t *def, type_t *type)
{
def_t *alias;
if (def->alias) {
expr_t e;
e.file = def->file;
e.line = def->line;
bug (&e, "aliasing an alias def");
}
ALLOC (16384, def_t, defs, alias);
alias->return_addr = __builtin_return_address (0);
alias->offset = def->offset;
alias->type = type;
alias->alias = def;
alias->line = pr.source_line;
alias->file = pr.source_file;
return alias;
}
def_t *
temp_def (etype_t type, int size)
{
def_t *temp;
defspace_t *space = current_func->symtab->space;
if ((temp = current_func->temp_defs[size - 1])) {
current_func->temp_defs[size - 1] = temp->temp_next;
temp->temp_next = 0;
} else {
ALLOC (16384, def_t, defs, temp);
temp->offset = defspace_alloc_loc (space, size);
*space->def_tail = temp;
space->def_tail = &temp->next;
temp->name = save_string (va (".tmp%d", current_func->temp_num++));
}
temp->return_addr = __builtin_return_address (0);
temp->type = ev_types[type];
temp->file = pr.source_file;
temp->line = pr.source_line;
set_storage_bits (temp, st_local);
temp->space = space;
return temp;
}
void
free_temp_def (def_t *temp)
{
int size = type_size (temp->type) - 1;
temp->temp_next = current_func->temp_defs[size];
current_func->temp_defs[size] = temp;
}
void
free_def (def_t *def)
{
if (!def->alias && def->space) {
def_t **d;
for (d = &def->space->defs; *d && *d != def; d = &(*d)->next)
;
if (!*d)
internal_error (0, "freeing unlinked def %s", def->name);
*d = def->next;
if (&def->next == def->space->def_tail)
def->space->def_tail = d;
if (!def->external)
defspace_free_loc (def->space, def->offset, type_size (def->type));
}
def->next = free_defs;
free_defs = def;
}
void
def_to_ddef (def_t *def, ddef_t *ddef, int aux)
{
type_t *type = def->type;
if (aux)
type = type->t.fldptr.type; // aux is true only for fields
ddef->type = type->type;
ddef->ofs = def->offset;
ddef->s_name = ReuseString (def->name);
}
static void
init_elements (struct def_s *def, expr_t *eles)
{
expr_t *e, *c;
int count, i, num_elements, base_offset;
pr_type_t *g;
def_t *elements;
base_offset = def->offset;
if (def->local && local_expr)
base_offset = 0;
if (is_array (def->type)) {
type_t *array_type = def->type->t.array.type;
int array_size = def->type->t.array.size;
elements = calloc (array_size, sizeof (def_t));
for (i = 0; i < array_size; i++) {
elements[i].type = array_type;
elements[i].space = def->space;
elements[i].offset = base_offset + i * type_size (array_type);
}
num_elements = i;
} else if (is_struct (def->type)) {
symtab_t *symtab = def->type->t.symtab;
symbol_t *field;
for (i = 0, field = symtab->symbols; field; field = field->next) {
if (field->sy_type != sy_var)
continue;
i++;
}
elements = calloc (i, sizeof (def_t));
for (i = 0, field = symtab->symbols; field; field = field->next) {
if (field->sy_type != sy_var)
continue;
elements[i].type = field->type;
elements[i].space = def->space;
elements[i].offset = base_offset + field->s.offset;
i++;
}
num_elements = i;
} else {
error (eles, "invalid initializer");
return;
}
for (count = 0, e = eles->e.block.head; e; count++, e = e->next) {
convert_name (e);
if (e->type == ex_nil && count < num_elements)
convert_nil (e, elements[count].type);
if (e->type == ex_error) {
free (elements);
return;
}
}
if (count > num_elements) {
if (options.warnings.initializer)
warning (eles, "excessive elements in initializer");
count = num_elements;
}
for (i = 0, e = eles->e.block.head; i < count; i++, e = e->next) {
g = D_POINTER (pr_type_t, &elements[i]);
c = constant_expr (e);
if (c->type == ex_block) {
if (!is_array (elements[i].type)
&& !is_struct (elements[i].type)) {
error (e, "type mismatch in initializer");
continue;
}
init_elements (&elements[i], c);
continue;
} else if (c->type == ex_labelref) {
def_t loc;
loc.space = elements[i].space;
loc.offset = elements[i].offset;
reloc_def_op (c->e.labelref.label, &loc);
continue;
} else if (c->type == ex_value) {
if (c->e.value->type == ev_integer
&& elements[i].type->type == ev_float)
convert_int (c);
if (get_type (c) != elements[i].type) {
error (e, "type mismatch in initializer");
continue;
}
} else {
if (!def->local || !local_expr) {
error (e, "non-constant initializer");
continue;
}
}
if (def->local && local_expr) {
int offset = elements[i].offset;
type_t *type = elements[i].type;
expr_t *ptr = new_pointer_expr (offset, type, def);
append_expr (local_expr, assign_expr (unary_expr ('.', ptr), c));
} else {
if (c->type != ex_value)
internal_error (c, "bogus expression type in init_elements()");
if (c->e.value->type == ev_string) {
EMIT_STRING (def->space, g->string_var,
c->e.value->v.string_val);
} else {
memcpy (g, &c->e.value->v, type_size (get_type (c)) * 4);
}
}
}
free (elements);
}
static void
init_vector_components (symbol_t *vector_sym, int is_field)
{
expr_t *vector_expr;
int i;
static const char *fields[] = { "x", "y", "z" };
vector_expr = new_symbol_expr (vector_sym);
for (i = 0; i < 3; i++) {
expr_t *expr = 0;
symbol_t *sym;
const char *name;
name = va ("%s_%s", vector_sym->name, fields[i]);
sym = symtab_lookup (current_symtab, name);
if (sym) {
if (sym->table == current_symtab) {
if (sym->sy_type != sy_expr) {
error (0, "%s redefined", name);
sym = 0;
} else {
expr = sym->s.expr;
if (is_field) {
if (expr->type != ex_value
|| expr->e.value->type != ev_field) {
error (0, "%s redefined", name);
sym = 0;
} else {
expr->e.value->v.pointer.def = vector_sym->s.def;
expr->e.value->v.pointer.val = i;
}
}
}
} else {
sym = 0;
}
}
if (!sym)
sym = new_symbol (name);
if (!expr) {
if (is_field) {
expr = new_field_expr (i, &type_float, vector_sym->s.def);
} else {
expr = binary_expr ('.', vector_expr,
new_symbol_expr (new_symbol (fields[i])));
}
}
sym->sy_type = sy_expr;
sym->s.expr = expr;
if (!sym->table)
symtab_addsymbol (current_symtab, sym);
}
}
static void
init_field_def (def_t *def, expr_t *init, storage_class_t storage)
{
type_t *type = def->type->t.fldptr.type;
def_t *field_def;
symbol_t *field_sym;
reloc_t *relocs = 0;
if (!init) {
field_sym = symtab_lookup (pr.entity_fields, def->name);
if (!field_sym)
field_sym = new_symbol_type (def->name, type);
if (field_sym->s.def && field_sym->s.def->external) {
//FIXME this really is not the right way
relocs = field_sym->s.def->relocs;
free_def (field_sym->s.def);
field_sym->s.def = 0;
}
if (!field_sym->s.def) {
field_sym->s.def = new_def (def->name, type, pr.entity_data, storage);
reloc_attach_relocs (relocs, &field_sym->s.def->relocs);
field_sym->s.def->nosave = 1;
}
field_def = field_sym->s.def;
if (!field_sym->table)
symtab_addsymbol (pr.entity_fields, field_sym);
if (storage != st_extern) {
D_INT (def) = field_def->offset;
reloc_def_field (field_def, def);
def->constant = 1;
def->nosave = 1;
}
// no support for initialized field vector componets (yet?)
if (type == &type_vector && options.code.vector_components)
init_vector_components (field_sym, 1);
} else if (init->type == ex_symbol) {
symbol_t *sym = init->e.symbol;
symbol_t *field = symtab_lookup (pr.entity_fields, sym->name);
if (field) {
expr_t *new = new_field_expr (0, field->type, field->s.def);
init->type = new->type;
init->e = new->e;
}
}
}
void
initialize_def (symbol_t *sym, type_t *type, expr_t *init, defspace_t *space,
storage_class_t storage)
{
symbol_t *check = symtab_lookup (current_symtab, sym->name);
reloc_t *relocs = 0;
if (!type) {
warning (0, "type for %s defaults to %s", sym->name,
type_default->name);
type = type_default;
}
if (check && check->table == current_symtab) {
if (check->sy_type != sy_var || check->type != type) {
error (0, "%s redefined", sym->name);
} else {
// is var and same type
if (!check->s.def)
internal_error (0, "half defined var");
if (storage == st_extern) {
if (init)
warning (0, "initializing external variable");
return;
}
if (init && check->s.def->initialized) {
error (0, "%s redefined", sym->name);
return;
}
sym = check;
}
}
sym->type = type;
if (!sym->table)
symtab_addsymbol (current_symtab, sym);
// if (storage == st_global && init && is_scalar (type)) {
// sym->sy_type = sy_const;
// memset (&sym->s.value, 0, sizeof (&sym->s.value));
// if (init->type != ex_value) { //FIXME arrays/structs
// error (0, "non-constant initializier");
// } else {
// sym->s.value = init->e.value;
// convert_value (&sym->s.value, sym->type);
// }
// return;
// }
if (sym->s.def && sym->s.def->external) {
//FIXME this really is not the right way
relocs = sym->s.def->relocs;
free_def (sym->s.def);
sym->s.def = 0;
}
if (!sym->s.def) {
sym->s.def = new_def (sym->name, type, space, storage);
reloc_attach_relocs (relocs, &sym->s.def->relocs);
}
if (type == &type_vector && options.code.vector_components)
init_vector_components (sym, 0);
if (type->type == ev_field && storage != st_local && storage != st_param)
init_field_def (sym->s.def, init, storage);
if (storage == st_extern) {
if (init)
warning (0, "initializing external variable");
return;
}
if (!init)
return;
convert_name (init);
if (init->type == ex_error)
return;
if (init->type == ex_nil)
convert_nil (init, type);
if ((is_array (type) || is_struct (type))
&& init->type == ex_block && !init->e.block.result) {
init_elements (sym->s.def, init);
} else {
if (!type_assignable (type, get_type (init))) {
error (init, "type mismatch in initializer");
return;
}
if (local_expr) {
init = assign_expr (new_symbol_expr (sym), init);
// fold_constants takes care of int/float conversions
append_expr (local_expr, fold_constants (init));
} else {
if (init->type != ex_value) { //FIXME enum etc
error (0, "non-constant initializier");
return;
}
if (init->e.value->type == ev_pointer
|| init->e.value->type == ev_field) {
// FIXME offset pointers
D_INT (sym->s.def) = init->e.value->v.pointer.val;
if (init->e.value->v.pointer.def)
reloc_def_field (init->e.value->v.pointer.def, sym->s.def);
} else {
ex_value_t v = *init->e.value;
if (is_scalar (sym->type))
convert_value (&v, sym->type);
if (v.type == ev_string) {
EMIT_STRING (sym->s.def->space, D_STRING (sym->s.def),
v.v.string_val);
} else {
memcpy (D_POINTER (void, sym->s.def), &v.v,
type_size (type) * sizeof (pr_type_t));
}
}
sym->s.def->initialized = sym->s.def->constant = 1;
sym->s.def->nosave = 1;
}
}
sym->s.def->initializer = init;
}
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