275 lines
6.9 KiB
C
275 lines
6.9 KiB
C
/*
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struct.c
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structure support
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Copyright (C) 2001 Bill Currie <bill@taniwha.org>
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Copyright (C) 2011 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2001/12/08
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Date: 2011/01/17
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <stdlib.h>
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#include <QF/dstring.h>
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#include <QF/hash.h>
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#include <QF/pr_obj.h>
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#include <QF/sys.h>
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#include <QF/va.h>
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#include "def.h"
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#include "defspace.h"
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#include "diagnostic.h"
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#include "emit.h"
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#include "expr.h"
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#include "immediate.h"
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#include "qfcc.h"
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#include "reloc.h"
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#include "strpool.h"
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#include "struct.h"
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#include "symtab.h"
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#include "type.h"
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static symbol_t *
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find_tag (ty_type_e ty, symbol_t *tag, type_t *type)
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{
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const char *tag_name;
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symbol_t *sym;
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static int tag_num;
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if (tag)
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tag_name = va ("tag %s", tag->name);
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else
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tag_name = va ("tag .%s.%d.%d",
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GETSTR (pr.source_file), pr.source_line, tag_num++);
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sym = symtab_lookup (current_symtab, tag_name);
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if (sym) {
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if (sym->table == current_symtab && sym->type->ty != ty)
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error (0, "%s defined as wrong kind of tag", tag->name);
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if (sym->type->ty == ty)
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return sym;
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}
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if (!type)
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type = new_type ();
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sym = new_symbol (tag_name);
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sym->type = type;
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sym->type->type = ev_invalid;
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sym->type->ty = ty;
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return sym;
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}
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symbol_t *
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find_struct (int su, symbol_t *tag, type_t *type)
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{
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ty_type_e ty = ty_struct;
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if (su == 'u')
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ty = ty_union;
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return find_tag (ty, tag, type);
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}
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symbol_t *
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build_struct (int su, symbol_t *tag, symtab_t *symtab, type_t *type)
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{
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symbol_t *sym = find_struct (su, tag, type);
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symbol_t *s;
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symtab->parent = 0; // disconnect struct's symtab from parent scope
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if (sym->table == current_symtab && sym->type->t.symtab) {
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error (0, "%s defined as wrong kind of tag", tag->name);
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return sym;
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}
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for (s = symtab->symbols; s; s = s->next) {
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if (s->sy_type != sy_var)
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continue;
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if (su == 's') {
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s->s.offset = symtab->size;
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symtab->size += type_size (s->type);
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} else {
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int size = type_size (s->type);
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if (size > symtab->size)
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symtab->size = size;
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}
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}
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sym->sy_type = sy_type;
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sym->type->t.symtab = symtab;
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return sym;
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}
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symbol_t *
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find_enum (symbol_t *tag)
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{
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return find_tag (ty_enum, tag, 0);
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}
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symtab_t *
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start_enum (symbol_t *sym)
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{
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if (sym->table == current_symtab && sym->type->t.symtab) {
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error (0, "%s defined as wrong kind of tag", sym->name);
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sym = find_enum (0);
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}
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sym->type->t.symtab = new_symtab (current_symtab, stab_local);
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return sym->type->t.symtab;
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}
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void
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add_enum (symbol_t *enm, symbol_t *name, expr_t *val)
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{
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type_t *enum_type = enm->type;
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symtab_t *enum_tab;
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int value;
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if (name->table == current_symtab)
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error (0, "%s redefined", name->name);
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if (name->table)
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name = new_symbol (name->name);
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name->sy_type = sy_const;
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name->type = enum_type;
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enum_tab = enum_type->t.symtab;
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value = 0;
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if (*enum_tab->symtail)
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value = ((symbol_t *)(*enum_tab->symtail))->s.value.v.integer_val + 1;
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if (val) {
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if (!is_constant (val))
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error (val, "non-constant initializer");
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else if (!is_integer_val (val))
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error (val, "invalid initializer type");
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else
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value = expr_integer (val);
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}
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name->s.value.v.integer_val = value;
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symtab_addsymbol (enum_tab, name);
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}
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symbol_t *
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make_structure (const char *name, int su, struct_def_t *defs, type_t *type)
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{
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symtab_t *strct;
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symbol_t *field;
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symbol_t *sym = 0;
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if (name)
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sym = new_symbol (name);
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if (su == 'u')
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strct = new_symtab (0, stab_union);
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else
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strct = new_symtab (0, stab_struct);
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while (defs->name) {
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field = new_symbol_type (defs->name, defs->type);
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if (!symtab_addsymbol (strct, field))
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internal_error (0, "duplicate symbol: %s", defs->name);
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defs++;
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}
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sym = build_struct (su, sym, strct, type);
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return sym;
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}
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def_t *
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emit_structure (const char *name, int su, struct_def_t *defs, type_t *type,
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void *data, storage_class_t storage)
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{
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type_t new;
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int i, j;
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int saw_null = 0;
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int saw_func = 0;
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symbol_t *struct_sym;
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symbol_t *field_sym;
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def_t *struct_def;
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def_t field_def;
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if (!type) {
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type = &new;
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make_structure (0, su, defs, type);
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}
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if (!is_struct (type) || (su == 's' && type->ty != ty_struct)
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|| (su == 'u' && type->ty != ty_union))
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internal_error (0, "structure %s type mismatch", name);
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for (i = 0, field_sym = type->t.symtab->symbols; field_sym;
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i++, field_sym = field_sym->next) {
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if (!defs[i].name)
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internal_error (0, "structure %s unexpected end of defs", name);
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if (field_sym->type != defs[i].type)
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internal_error (0, "structure %s.%s field type mismatch", name,
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defs[i].name);
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if ((!defs[i].emit && saw_func) || (defs[i].emit && saw_null))
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internal_error (0, "structure %s mixed emit/copy", name);
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if (!defs[i].emit)
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saw_null = 1;
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if (defs[i].emit)
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saw_func = 1;
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}
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if (defs[i].name)
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internal_error (0, "structure %s too many defs", name);
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if (storage != st_global && storage != st_static)
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internal_error (0, "structure %s must be global or static", name);
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struct_sym = make_symbol (name, type, pr.far_data, storage);
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struct_def = struct_sym->s.def;
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if (struct_def->initialized)
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internal_error (0, "structure %s must be global or static", name);
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struct_def->initialized = struct_def->constant = 1;
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struct_def->nosave = 1;
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for (i = 0, field_sym = type->t.symtab->symbols; field_sym;
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i++, field_sym = field_sym->next) {
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field_def.type = field_sym->type;
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field_def.name = save_string (va ("%s.%s", name, field_sym->name));
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field_def.space = struct_def->space;
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field_def.offset = struct_def->offset + field_sym->s.offset;
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if (!defs[i].emit) {
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//FIXME relocs? arrays? structs?
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pr_type_t *val = (pr_type_t *) data;
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memcpy (D_POINTER (void, &field_def), val,
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type_size (field_def.type) * sizeof (pr_type_t));
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data = &val[type_size (field_def.type)];
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} else {
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if (is_array (field_def.type)) {
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for (j = 0; j < field_def.type->t.array.size; j++) {
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defs[i].emit (&field_def, data, 0);
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field_def.offset+=type_size (field_def.type->t.array.type);
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}
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} else {
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defs[i].emit (&field_def, data, 0);
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}
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}
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}
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return struct_def;
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}
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