737 lines
17 KiB
C
737 lines
17 KiB
C
/*
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function.c
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QC function support code
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Copyright (C) 2002 Bill Currie
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Author: Bill Currie <bill@taniwha.org>
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Date: 2002/5/7
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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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#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/alloc.h"
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#include "QF/dstring.h"
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#include "QF/hash.h"
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#include "QF/va.h"
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#include "qfcc.h"
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#include "class.h"
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#include "codespace.h"
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#include "debug.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 "flow.h"
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#include "function.h"
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#include "opcodes.h"
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#include "options.h"
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#include "reloc.h"
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#include "shared.h"
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#include "statements.h"
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#include "strpool.h"
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#include "symtab.h"
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#include "type.h"
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#include "value.h"
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static param_t *params_freelist;
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static function_t *functions_freelist;
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static hashtab_t *overloaded_functions;
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static hashtab_t *function_map;
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static const char *
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ol_func_get_key (const void *_f, void *unused)
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{
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overloaded_function_t *f = (overloaded_function_t *) _f;
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return f->full_name;
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}
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static const char *
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func_map_get_key (const void *_f, void *unused)
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{
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overloaded_function_t *f = (overloaded_function_t *) _f;
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return f->name;
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}
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param_t *
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new_param (const char *selector, type_t *type, const char *name)
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{
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param_t *param;
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ALLOC (4096, param_t, params, param);
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param->next = 0;
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param->selector = selector;
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param->type = type;
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param->name = name;
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return param;
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}
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param_t *
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param_append_identifiers (param_t *params, symbol_t *idents, type_t *type)
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{
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param_t **p = ¶ms;
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while (*p)
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p = &(*p)->next;
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if (!idents) {
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*p = new_param (0, 0, 0);
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p = &(*p)->next;
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}
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while (idents) {
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idents->type = type;
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*p = new_param (0, type, idents->name);
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(*p)->symbol = idents;
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p = &(*p)->next;
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idents = idents->next;
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}
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return params;
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}
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static param_t *
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_reverse_params (param_t *params, param_t *next)
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{
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param_t *p = params;
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if (params->next)
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p = _reverse_params (params->next, params);
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params->next = next;
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return p;
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}
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param_t *
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reverse_params (param_t *params)
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{
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if (!params)
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return 0;
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return _reverse_params (params, 0);
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}
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param_t *
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append_params (param_t *params, param_t *more_params)
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{
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if (params) {
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param_t *p;
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for (p = params; p->next; ) {
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p = p->next;
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}
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p->next = more_params;
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return params;
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}
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return more_params;
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}
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param_t *
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copy_params (param_t *params)
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{
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param_t *n_parms = 0, **p = &n_parms;
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while (params) {
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*p = new_param (params->selector, params->type, params->name);
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params = params->next;
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p = &(*p)->next;
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}
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return n_parms;
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}
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type_t *
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parse_params (type_t *type, param_t *parms)
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{
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param_t *p;
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type_t *new;
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int count = 0;
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if (type && obj_is_class (type)) {
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error (0, "cannot return an object (forgot *?)");
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type = &type_id;
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}
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new = new_type ();
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new->type = ev_func;
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new->alignment = 1;
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new->t.func.type = type;
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new->t.func.num_params = 0;
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for (p = parms; p; p = p->next) {
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if (p->type) {
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count++;
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}
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}
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if (count) {
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new->t.func.param_types = malloc (count * sizeof (type_t));
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}
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for (p = parms; p; p = p->next) {
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if (!p->selector && !p->type && !p->name) {
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if (p->next)
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internal_error (0, 0);
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new->t.func.num_params = -(new->t.func.num_params + 1);
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} else if (p->type) {
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if (obj_is_class (p->type)) {
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error (0, "cannot use an object as a parameter (forgot *?)");
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p->type = &type_id;
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}
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new->t.func.param_types[new->t.func.num_params] = p->type;
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new->t.func.num_params++;
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}
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}
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return new;
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}
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param_t *
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check_params (param_t *params)
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{
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int num = 1;
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param_t *p = params;
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if (!params)
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return 0;
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while (p) {
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if (p->type == &type_void) {
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if (p->name) {
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error (0, "parameter %d ('%s') has incomplete type", num,
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p->name);
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p->type = type_default;
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} else if (num > 1 || p->next) {
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error (0, "'void' must be the only parameter");
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p->name = "void";
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} else {
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// this is a void function
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return 0;
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}
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}
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p = p->next;
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}
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return params;
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}
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static overloaded_function_t *
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get_function (const char *name, type_t *type, int overload, int create)
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{
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const char *full_name;
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overloaded_function_t *func;
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if (!overloaded_functions) {
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overloaded_functions = Hash_NewTable (1021, ol_func_get_key, 0, 0);
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function_map = Hash_NewTable (1021, func_map_get_key, 0, 0);
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}
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name = save_string (name);
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full_name = save_string (va ("%s|%s", name, encode_params (type)));
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func = Hash_Find (overloaded_functions, full_name);
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if (func) {
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if (func->type != type) {
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error (0, "can't overload on return types");
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return func;
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}
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return func;
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}
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if (!create)
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return 0;
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func = Hash_Find (function_map, name);
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if (func) {
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if (!overload && !func->overloaded) {
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expr_t *e = new_expr ();
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e->line = func->line;
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e->file = func->file;
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warning (0, "creating overloaded function %s without @overload",
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full_name);
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warning (e, "(previous function is %s)", func->full_name);
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}
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overload = 1;
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}
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func = calloc (1, sizeof (overloaded_function_t));
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func->name = name;
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func->full_name = full_name;
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func->type = type;
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func->overloaded = overload;
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func->file = pr.source_file;
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func->line = pr.source_line;
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Hash_Add (overloaded_functions, func);
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Hash_Add (function_map, func);
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return func;
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}
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symbol_t *
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function_symbol (symbol_t *sym, int overload, int create)
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{
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const char *name = sym->name;
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overloaded_function_t *func;
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symbol_t *s;
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func = get_function (name, sym->type, overload, create);
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if (func && func->overloaded)
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name = func->full_name;
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s = symtab_lookup (current_symtab, name);
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if ((!s || s->table != current_symtab) && create) {
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s = new_symbol (name);
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s->sy_type = sy_func;
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s->type = sym->type;
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s->params = sym->params;
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s->s.func = 0; // function not yet defined
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symtab_addsymbol (current_symtab, s);
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}
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return s;
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}
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// NOTE sorts the list in /reverse/ order
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static int
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func_compare (const void *a, const void *b)
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{
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overloaded_function_t *fa = *(overloaded_function_t **) a;
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overloaded_function_t *fb = *(overloaded_function_t **) b;
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type_t *ta = fa->type;
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type_t *tb = fb->type;
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int na = ta->t.func.num_params;
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int nb = tb->t.func.num_params;
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int ret, i;
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if (na < 0)
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na = ~na;
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if (nb < 0)
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nb = ~nb;
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if (na != nb)
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return nb - na;
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if ((ret = (fb->type->t.func.num_params - fa->type->t.func.num_params)))
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return ret;
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for (i = 0; i < na && i < nb; i++)
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if (ta->t.func.param_types[i] != tb->t.func.param_types[i])
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return (long)(tb->t.func.param_types[i] - ta->t.func.param_types[i]);
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return 0;
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}
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expr_t *
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find_function (expr_t *fexpr, expr_t *params)
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{
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expr_t *e;
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int i, j, func_count, parm_count, reported = 0;
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overloaded_function_t *f, dummy, *best = 0;
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type_t type;
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void **funcs, *dummy_p = &dummy;
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if (fexpr->type != ex_symbol)
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return fexpr;
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memset (&type, 0, sizeof (type));
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type.type = ev_func;
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for (e = params; e; e = e->next) {
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if (e->type == ex_error)
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return e;
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type.t.func.num_params++;
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}
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i = type.t.func.num_params * sizeof (type_t);
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type.t.func.param_types = alloca(i);
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memset (type.t.func.param_types, 0, i);
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for (i = 0, e = params; e; i++, e = e->next) {
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type.t.func.param_types[type.t.func.num_params - 1 - i] = get_type (e);
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if (e->type == ex_error)
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return e;
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}
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funcs = Hash_FindList (function_map, fexpr->e.symbol->name);
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if (!funcs)
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return fexpr;
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for (func_count = 0; funcs[func_count]; func_count++)
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;
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if (func_count < 2) {
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f = (overloaded_function_t *) funcs[0];
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if (func_count && !f->overloaded) {
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free (funcs);
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return fexpr;
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}
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}
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type.t.func.type = ((overloaded_function_t *) funcs[0])->type->t.func.type;
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dummy.type = find_type (&type);
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qsort (funcs, func_count, sizeof (void *), func_compare);
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dummy.full_name = save_string (va ("%s|%s", fexpr->e.symbol->name,
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encode_params (&type)));
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dummy_p = bsearch (&dummy_p, funcs, func_count, sizeof (void *),
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func_compare);
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if (dummy_p) {
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f = (overloaded_function_t *) *(void **) dummy_p;
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if (f->overloaded) {
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fexpr->e.symbol = symtab_lookup (current_symtab, f->full_name);
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if (!fexpr->e.symbol)
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internal_error (fexpr, "overloaded function %s not found",
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best->full_name);
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}
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free (funcs);
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return fexpr;
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}
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for (i = 0; i < func_count; i++) {
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f = (overloaded_function_t *) funcs[i];
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parm_count = f->type->t.func.num_params;
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if ((parm_count >= 0 && parm_count != type.t.func.num_params)
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|| (parm_count < 0 && ~parm_count > type.t.func.num_params)) {
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funcs[i] = 0;
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continue;
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}
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if (parm_count < 0)
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parm_count = ~parm_count;
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for (j = 0; j < parm_count; j++) {
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if (!type_assignable (f->type->t.func.param_types[j],
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type.t.func.param_types[j])) {
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funcs[i] = 0;
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break;
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}
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}
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if (j < parm_count)
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continue;
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}
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for (i = 0; i < func_count; i++) {
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f = (overloaded_function_t *) funcs[i];
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if (f) {
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if (!best) {
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best = f;
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} else {
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if (!reported) {
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reported = 1;
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error (fexpr, "unable to disambiguate %s",
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dummy.full_name);
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error (fexpr, "possible match: %s", best->full_name);
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}
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error (fexpr, "possible match: %s", f->full_name);
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}
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}
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}
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if (reported)
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return fexpr;
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if (best) {
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if (best->overloaded) {
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fexpr->e.symbol = symtab_lookup (current_symtab,
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best->full_name);
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if (!fexpr->e.symbol)
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internal_error (fexpr, "overloaded function %s not found",
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best->full_name);
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}
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free (funcs);
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return fexpr;
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}
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error (fexpr, "unable to find function matching %s", dummy.full_name);
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free (funcs);
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return fexpr;
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}
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static void
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check_function (symbol_t *fsym)
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{
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param_t *params = fsym->params;
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param_t *p;
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int i;
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if (!type_size (fsym->type->t.func.type)) {
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error (0, "return type is an incomplete type");
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fsym->type->t.func.type = &type_void;//FIXME better type?
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}
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if (type_size (fsym->type->t.func.type) > type_size (&type_param)) {
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error (0, "return value too large to be passed by value (%d)",
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type_size (&type_param));
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fsym->type->t.func.type = &type_void;//FIXME better type?
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}
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for (p = params, i = 0; p; p = p->next, i++) {
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if (!p->selector && !p->type && !p->name)
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continue; // ellipsis marker
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if (!p->type)
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continue; // non-param selector
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if (!type_size (p->type))
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error (0, "parameter %d (‘%s’) has incomplete type",
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i + 1, p->name);
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if (type_size (p->type) > type_size (&type_param))
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error (0, "param %d (‘%s’) is too large to be passed by value",
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i + 1, p->name);
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}
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}
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static void
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build_scope (symbol_t *fsym, symtab_t *parent)
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{
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int i;
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param_t *p;
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symbol_t *args = 0;
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symbol_t *param;
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symtab_t *symtab;
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symtab_t *cs = current_symtab;
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check_function (fsym);
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symtab = new_symtab (parent, stab_local);
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fsym->s.func->symtab = symtab;
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fsym->s.func->label_scope = new_symtab (0, stab_local);
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symtab->space = defspace_new (ds_virtual);
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current_symtab = symtab;
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if (fsym->type->t.func.num_params < 0) {
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args = new_symbol_type (".args", &type_va_list);
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initialize_def (args, 0, symtab->space, sc_param);
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}
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for (p = fsym->params, i = 0; p; p = p->next) {
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if (!p->selector && !p->type && !p->name)
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continue; // ellipsis marker
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if (!p->type)
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continue; // non-param selector
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if (!p->name) {
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error (0, "parameter name omitted");
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p->name = save_string ("");
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}
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param = new_symbol_type (p->name, p->type);
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initialize_def (param, 0, symtab->space, sc_param);
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i++;
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}
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if (args) {
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while (i < MAX_PARMS) {
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param = new_symbol_type (va (".par%d", i), &type_param);
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initialize_def (param, 0, symtab->space, sc_param);
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i++;
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}
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}
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current_symtab = cs;
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}
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function_t *
|
||
new_function (const char *name, const char *nice_name)
|
||
{
|
||
function_t *f;
|
||
|
||
ALLOC (1024, function_t, functions, f);
|
||
f->s_name = ReuseString (name);
|
||
f->s_file = pr.source_file;
|
||
if (!(f->name = nice_name))
|
||
f->name = name;
|
||
return f;
|
||
}
|
||
|
||
void
|
||
make_function (symbol_t *sym, const char *nice_name, defspace_t *space,
|
||
storage_class_t storage)
|
||
{
|
||
reloc_t *relocs = 0;
|
||
if (sym->sy_type != sy_func)
|
||
internal_error (0, "%s is not a function", sym->name);
|
||
if (storage == sc_extern && sym->s.func)
|
||
return;
|
||
if (!sym->s.func) {
|
||
sym->s.func = new_function (sym->name, nice_name);
|
||
sym->s.func->sym = sym;
|
||
}
|
||
if (sym->s.func->def && sym->s.func->def->external
|
||
&& storage != sc_extern) {
|
||
//FIXME this really is not the right way
|
||
relocs = sym->s.func->def->relocs;
|
||
free_def (sym->s.func->def);
|
||
sym->s.func->def = 0;
|
||
}
|
||
if (!sym->s.func->def) {
|
||
sym->s.func->def = new_def (sym->name, sym->type, space, storage);
|
||
reloc_attach_relocs (relocs, &sym->s.func->def->relocs);
|
||
}
|
||
}
|
||
|
||
void
|
||
add_function (function_t *f)
|
||
{
|
||
*pr.func_tail = f;
|
||
pr.func_tail = &f->next;
|
||
f->function_num = pr.num_functions++;
|
||
}
|
||
|
||
function_t *
|
||
begin_function (symbol_t *sym, const char *nicename, symtab_t *parent,
|
||
int far)
|
||
{
|
||
defspace_t *space;
|
||
|
||
if (sym->sy_type != sy_func) {
|
||
error (0, "%s is not a function", sym->name);
|
||
sym = new_symbol_type (sym->name, &type_function);
|
||
sym = function_symbol (sym, 1, 1);
|
||
}
|
||
if (sym->s.func && sym->s.func->def && sym->s.func->def->initialized) {
|
||
error (0, "%s redefined", sym->name);
|
||
sym = new_symbol_type (sym->name, sym->type);
|
||
sym = function_symbol (sym, 1, 1);
|
||
}
|
||
space = sym->table->space;
|
||
if (far)
|
||
space = pr.far_data;
|
||
make_function (sym, nicename, space, current_storage);
|
||
if (!sym->s.func->def->external) {
|
||
sym->s.func->def->initialized = 1;
|
||
sym->s.func->def->constant = 1;
|
||
sym->s.func->def->nosave = 1;
|
||
add_function (sym->s.func);
|
||
reloc_def_func (sym->s.func, sym->s.func->def);
|
||
}
|
||
sym->s.func->code = pr.code->size;
|
||
|
||
sym->s.func->s_file = pr.source_file;
|
||
if (options.code.debug) {
|
||
pr_lineno_t *lineno = new_lineno ();
|
||
sym->s.func->line_info = lineno - pr.linenos;
|
||
}
|
||
|
||
build_scope (sym, parent);
|
||
return sym->s.func;
|
||
}
|
||
|
||
static void
|
||
build_function (symbol_t *fsym)
|
||
{
|
||
if (fsym->type->t.func.num_params > MAX_PARMS) {
|
||
error (0, "too many params");
|
||
}
|
||
// FIXME
|
||
// f->def->constant = 1;
|
||
// f->def->nosave = 1;
|
||
// f->def->initialized = 1;
|
||
// G_FUNCTION (f->def->ofs) = f->function_num;
|
||
}
|
||
|
||
function_t *
|
||
build_code_function (symbol_t *fsym, expr_t *state_expr, expr_t *statements)
|
||
{
|
||
if (fsym->sy_type != sy_func) // probably in error recovery
|
||
return 0;
|
||
build_function (fsym);
|
||
if (state_expr) {
|
||
state_expr->next = statements;
|
||
statements = state_expr;
|
||
}
|
||
emit_function (fsym->s.func, statements);
|
||
finish_function (fsym->s.func);
|
||
return fsym->s.func;
|
||
}
|
||
|
||
function_t *
|
||
build_builtin_function (symbol_t *sym, expr_t *bi_val, int far)
|
||
{
|
||
int bi;
|
||
defspace_t *space;
|
||
|
||
if (sym->sy_type != sy_func) {
|
||
error (bi_val, "%s is not a function", sym->name);
|
||
return 0;
|
||
}
|
||
if (sym->s.func && sym->s.func->def && sym->s.func->def->initialized) {
|
||
error (bi_val, "%s redefined", sym->name);
|
||
return 0;
|
||
}
|
||
if (!is_integer_val (bi_val) && !is_float_val (bi_val)) {
|
||
error (bi_val, "invalid constant for = #");
|
||
return 0;
|
||
}
|
||
space = sym->table->space;
|
||
if (far)
|
||
space = pr.far_data;
|
||
make_function (sym, 0, space, current_storage);
|
||
if (sym->s.func->def->external)
|
||
return 0;
|
||
|
||
sym->s.func->def->initialized = 1;
|
||
sym->s.func->def->constant = 1;
|
||
sym->s.func->def->nosave = 1;
|
||
add_function (sym->s.func);
|
||
|
||
if (is_integer_val (bi_val))
|
||
bi = expr_integer (bi_val);
|
||
else
|
||
bi = expr_float (bi_val);
|
||
if (bi < 0) {
|
||
error (bi_val, "builtin functions must be positive or 0");
|
||
return 0;
|
||
}
|
||
sym->s.func->builtin = bi;
|
||
reloc_def_func (sym->s.func, sym->s.func->def);
|
||
build_function (sym);
|
||
finish_function (sym->s.func);
|
||
|
||
// for debug info
|
||
build_scope (sym, current_symtab);
|
||
sym->s.func->symtab->space->size = 0;
|
||
return sym->s.func;
|
||
}
|
||
|
||
void
|
||
finish_function (function_t *f)
|
||
{
|
||
}
|
||
|
||
void
|
||
emit_function (function_t *f, expr_t *e)
|
||
{
|
||
if (pr.error_count)
|
||
return;
|
||
f->code = pr.code->size;
|
||
lineno_base = f->def->line;
|
||
f->sblock = make_statements (e);
|
||
if (options.code.optimize) {
|
||
flow_data_flow (f);
|
||
} else {
|
||
statements_count_temps (f->sblock);
|
||
}
|
||
emit_statements (f->sblock);
|
||
}
|
||
|
||
int
|
||
function_parms (function_t *f, byte *parm_size)
|
||
{
|
||
int count, i;
|
||
ty_func_t *func = &f->sym->type->t.func;
|
||
|
||
if (func->num_params >= 0)
|
||
count = func->num_params;
|
||
else
|
||
count = -func->num_params - 1;
|
||
|
||
for (i = 0; i < count; i++)
|
||
parm_size[i] = type_size (func->param_types[i]);
|
||
return func->num_params;
|
||
}
|
||
|
||
void
|
||
clear_functions (void)
|
||
{
|
||
if (overloaded_functions)
|
||
Hash_FlushTable (overloaded_functions);
|
||
if (function_map)
|
||
Hash_FlushTable (function_map);
|
||
}
|