mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-30 16:10:53 +00:00
2464a89d37
Freeing then re-allocating a def to change its storage from external is really not the right way to do it, but for now this fixes the loss of the relocs. With this, the menus seem to work :)
669 lines
15 KiB
C
669 lines
15 KiB
C
/*
|
||
function.c
|
||
|
||
QC function support code
|
||
|
||
Copyright (C) 2002 Bill Currie
|
||
|
||
Author: Bill Currie <bill@taniwha.org>
|
||
Date: 2002/5/7
|
||
|
||
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
|
||
|
||
static __attribute__ ((used)) const char rcsid[] =
|
||
"$Id$";
|
||
|
||
#ifdef HAVE_STRING_H
|
||
# include <string.h>
|
||
#endif
|
||
#ifdef HAVE_STRINGS_H
|
||
# include <strings.h>
|
||
#endif
|
||
#include <stdlib.h>
|
||
|
||
#include "QF/dstring.h"
|
||
#include "QF/hash.h"
|
||
#include "QF/va.h"
|
||
|
||
#include "qfcc.h"
|
||
|
||
#include "codespace.h"
|
||
#include "debug.h"
|
||
#include "def.h"
|
||
#include "defspace.h"
|
||
#include "diagnostic.h"
|
||
#include "emit.h"
|
||
#include "expr.h"
|
||
#include "function.h"
|
||
#include "immediate.h"
|
||
#include "opcodes.h"
|
||
#include "options.h"
|
||
#include "reloc.h"
|
||
#include "statements.h"
|
||
#include "strpool.h"
|
||
#include "symtab.h"
|
||
#include "type.h"
|
||
|
||
static param_t *free_params;
|
||
static function_t *free_functions;
|
||
static hashtab_t *overloaded_functions;
|
||
static hashtab_t *function_map;
|
||
|
||
static const char *
|
||
ol_func_get_key (void *_f, void *unused)
|
||
{
|
||
overloaded_function_t *f = (overloaded_function_t *) _f;
|
||
return f->full_name;
|
||
}
|
||
|
||
static const char *
|
||
func_map_get_key (void *_f, void *unused)
|
||
{
|
||
overloaded_function_t *f = (overloaded_function_t *) _f;
|
||
return f->name;
|
||
}
|
||
|
||
param_t *
|
||
new_param (const char *selector, type_t *type, const char *name)
|
||
{
|
||
param_t *param;
|
||
|
||
ALLOC (4096, param_t, params, param);
|
||
param->next = 0;
|
||
param->selector = selector;
|
||
param->type = type;
|
||
param->name = name;
|
||
|
||
return param;
|
||
}
|
||
|
||
param_t *
|
||
param_append_identifiers (param_t *params, symbol_t *idents, type_t *type)
|
||
{
|
||
param_t **p = ¶ms;
|
||
|
||
while (*p)
|
||
p = &(*p)->next;
|
||
if (!idents) {
|
||
*p = new_param (0, 0, 0);
|
||
p = &(*p)->next;
|
||
}
|
||
while (idents) {
|
||
idents->type = type;
|
||
*p = new_param (0, type, idents->name);
|
||
(*p)->symbol = idents;
|
||
p = &(*p)->next;
|
||
idents = idents->next;
|
||
}
|
||
return params;
|
||
}
|
||
|
||
param_t *
|
||
_reverse_params (param_t *params, param_t *next)
|
||
{
|
||
param_t *p = params;
|
||
if (params->next)
|
||
p = _reverse_params (params->next, params);
|
||
params->next = next;
|
||
return p;
|
||
}
|
||
|
||
param_t *
|
||
reverse_params (param_t *params)
|
||
{
|
||
if (!params)
|
||
return 0;
|
||
return _reverse_params (params, 0);
|
||
}
|
||
|
||
param_t *
|
||
copy_params (param_t *params)
|
||
{
|
||
param_t *n_parms = 0, **p = &n_parms;
|
||
|
||
while (params) {
|
||
*p = new_param (params->selector, params->type, params->name);
|
||
params = params->next;
|
||
p = &(*p)->next;
|
||
}
|
||
return n_parms;
|
||
}
|
||
|
||
type_t *
|
||
parse_params (type_t *type, param_t *parms)
|
||
{
|
||
param_t *p;
|
||
type_t *new;
|
||
|
||
new = new_type ();
|
||
new->type = ev_func;
|
||
new->t.func.type = type;
|
||
new->t.func.num_params = 0;
|
||
|
||
for (p = parms; p; p = p->next) {
|
||
if (new->t.func.num_params > MAX_PARMS) {
|
||
error (0, "too many params");
|
||
return type;
|
||
}
|
||
if (!p->selector && !p->type && !p->name) {
|
||
if (p->next) {
|
||
error (0, "internal error");
|
||
abort ();
|
||
}
|
||
new->t.func.num_params = -(new->t.func.num_params + 1);
|
||
} else if (p->type) {
|
||
new->t.func.param_types[new->t.func.num_params] = p->type;
|
||
new->t.func.num_params++;
|
||
}
|
||
}
|
||
return new;
|
||
}
|
||
|
||
param_t *
|
||
check_params (param_t *params)
|
||
{
|
||
int num = 1;
|
||
param_t *p = params;
|
||
if (!params)
|
||
return 0;
|
||
while (p) {
|
||
if (p->type == &type_void) {
|
||
if (p->name) {
|
||
error (0, "parameter %d ('%s') has incomplete type", num,
|
||
p->name);
|
||
p->type = type_default;
|
||
} else if (num > 1 || p->next) {
|
||
error (0, "'void' must be the only parameter");
|
||
p->name = "void";
|
||
} else {
|
||
// this is a void function
|
||
return 0;
|
||
}
|
||
}
|
||
p = p->next;
|
||
}
|
||
return params;
|
||
}
|
||
|
||
static overloaded_function_t *
|
||
get_function (const char *name, type_t *type, int overload, int create)
|
||
{
|
||
const char *full_name;
|
||
overloaded_function_t *func;
|
||
|
||
if (!overloaded_functions) {
|
||
overloaded_functions = Hash_NewTable (1021, ol_func_get_key, 0, 0);
|
||
function_map = Hash_NewTable (1021, func_map_get_key, 0, 0);
|
||
}
|
||
|
||
name = save_string (name);
|
||
|
||
full_name = save_string (va ("%s|%s", name, encode_params (type)));
|
||
|
||
func = Hash_Find (overloaded_functions, full_name);
|
||
if (func) {
|
||
if (func->type != type) {
|
||
error (0, "can't overload on return types");
|
||
return func;
|
||
}
|
||
return func;
|
||
}
|
||
|
||
if (!create)
|
||
return 0;
|
||
|
||
func = Hash_Find (function_map, name);
|
||
if (func) {
|
||
if (!overload && !func->overloaded) {
|
||
expr_t *e = new_expr ();
|
||
e->line = func->line;
|
||
e->file = func->file;
|
||
warning (0, "creating overloaded function %s without @overload",
|
||
full_name);
|
||
warning (e, "(previous function is %s)", func->full_name);
|
||
}
|
||
overload = 1;
|
||
}
|
||
|
||
func = calloc (1, sizeof (overloaded_function_t));
|
||
func->name = name;
|
||
func->full_name = full_name;
|
||
func->type = type;
|
||
func->overloaded = overload;
|
||
func->file = pr.source_file;
|
||
func->line = pr.source_line;
|
||
|
||
Hash_Add (overloaded_functions, func);
|
||
Hash_Add (function_map, func);
|
||
return func;
|
||
}
|
||
|
||
symbol_t *
|
||
function_symbol (symbol_t *sym, int overload, int create)
|
||
{
|
||
const char *name = sym->name;
|
||
overloaded_function_t *func;
|
||
symbol_t *s;
|
||
|
||
func = get_function (name, sym->type, overload, create);
|
||
|
||
if (func && func->overloaded)
|
||
name = func->full_name;
|
||
s = symtab_lookup (current_symtab, name);
|
||
if ((!s || s->table != current_symtab) && create) {
|
||
s = new_symbol (name);
|
||
s->sy_type = sy_func;
|
||
s->type = sym->type;
|
||
s->params = sym->params;
|
||
s->s.func = 0; // function not yet defined
|
||
symtab_addsymbol (current_symtab, s);
|
||
}
|
||
return s;
|
||
}
|
||
|
||
// NOTE sorts the list in /reverse/ order
|
||
static int
|
||
func_compare (const void *a, const void *b)
|
||
{
|
||
overloaded_function_t *fa = *(overloaded_function_t **) a;
|
||
overloaded_function_t *fb = *(overloaded_function_t **) b;
|
||
type_t *ta = fa->type;
|
||
type_t *tb = fb->type;
|
||
int na = ta->t.func.num_params;
|
||
int nb = tb->t.func.num_params;
|
||
int ret, i;
|
||
|
||
if (na < 0)
|
||
na = ~na;
|
||
if (nb < 0)
|
||
nb = ~nb;
|
||
if (na != nb)
|
||
return nb - na;
|
||
if ((ret = (fb->type->t.func.num_params - fa->type->t.func.num_params)))
|
||
return ret;
|
||
for (i = 0; i < na && i < nb; i++)
|
||
if (ta->t.func.param_types[i] != tb->t.func.param_types[i])
|
||
return (long)(tb->t.func.param_types[i] - ta->t.func.param_types[i]);
|
||
return 0;
|
||
}
|
||
|
||
expr_t *
|
||
find_function (expr_t *fexpr, expr_t *params)
|
||
{
|
||
expr_t *e;
|
||
int i, j, func_count, parm_count, reported = 0;
|
||
overloaded_function_t *f, dummy, *best = 0;
|
||
type_t type;
|
||
void **funcs, *dummy_p = &dummy;
|
||
|
||
if (fexpr->type != ex_symbol)
|
||
return fexpr;
|
||
|
||
memset (&type, 0, sizeof (type));
|
||
|
||
for (e = params; e; e = e->next) {
|
||
if (e->type == ex_error)
|
||
return e;
|
||
type.t.func.num_params++;
|
||
}
|
||
if (type.t.func.num_params > MAX_PARMS)
|
||
return fexpr;
|
||
for (i = 0, e = params; e; i++, e = e->next) {
|
||
type.t.func.param_types[type.t.func.num_params - 1 - i] = get_type (e);
|
||
if (e->type == ex_error)
|
||
return e;
|
||
}
|
||
funcs = Hash_FindList (function_map, fexpr->e.symbol->name);
|
||
if (!funcs)
|
||
return fexpr;
|
||
for (func_count = 0; funcs[func_count]; func_count++)
|
||
;
|
||
if (func_count < 2) {
|
||
free (funcs);
|
||
return fexpr;
|
||
}
|
||
type.t.func.type = ((overloaded_function_t *) funcs[0])->type->t.func.type;
|
||
dummy.type = find_type (&type);
|
||
|
||
qsort (funcs, func_count, sizeof (void *), func_compare);
|
||
dummy.full_name = save_string (va ("%s|%s", fexpr->e.symbol->name,
|
||
encode_params (&type)));
|
||
dummy_p = bsearch (&dummy_p, funcs, func_count, sizeof (void *),
|
||
func_compare);
|
||
if (dummy_p) {
|
||
f = (overloaded_function_t *) *(void **) dummy_p;
|
||
if (f->overloaded)
|
||
fexpr->e.symbol->name = f->full_name;
|
||
free (funcs);
|
||
return fexpr;
|
||
}
|
||
for (i = 0; i < func_count; i++) {
|
||
f = (overloaded_function_t *) funcs[i];
|
||
parm_count = f->type->t.func.num_params;
|
||
if ((parm_count >= 0 && parm_count != type.t.func.num_params)
|
||
|| (parm_count < 0 && ~parm_count > type.t.func.num_params)) {
|
||
funcs[i] = 0;
|
||
continue;
|
||
}
|
||
if (parm_count < 0)
|
||
parm_count = ~parm_count;
|
||
for (j = 0; j < parm_count; j++) {
|
||
if (!type_assignable (f->type->t.func.param_types[j],
|
||
type.t.func.param_types[j])) {
|
||
funcs[i] = 0;
|
||
break;
|
||
}
|
||
}
|
||
if (j < parm_count)
|
||
continue;
|
||
}
|
||
for (i = 0; i < func_count; i++) {
|
||
f = (overloaded_function_t *) funcs[i];
|
||
if (f) {
|
||
if (!best) {
|
||
best = f;
|
||
} else {
|
||
if (!reported) {
|
||
reported = 1;
|
||
error (fexpr, "unable to disambiguate %s",
|
||
dummy.full_name);
|
||
error (fexpr, "possible match: %s", best->full_name);
|
||
}
|
||
error (fexpr, "possible match: %s", f->full_name);
|
||
}
|
||
}
|
||
}
|
||
if (reported)
|
||
return fexpr;
|
||
if (best) {
|
||
if (best->overloaded) {
|
||
fexpr->e.symbol = symtab_lookup (current_symtab,
|
||
best->full_name);
|
||
if (!fexpr->e.symbol)
|
||
internal_error (fexpr, "overloaded function %s not found",
|
||
best->full_name);
|
||
}
|
||
free (funcs);
|
||
return fexpr;
|
||
}
|
||
error (fexpr, "unable to find function matching %s", dummy.full_name);
|
||
free (funcs);
|
||
return fexpr;
|
||
}
|
||
|
||
static void
|
||
check_function (symbol_t *fsym)
|
||
{
|
||
param_t *params = fsym->params;
|
||
param_t *p;
|
||
int i;
|
||
|
||
if (!type_size (fsym->type->t.func.type)) {
|
||
error (0, "return type is an incomplete type");
|
||
fsym->type->t.func.type = &type_void;//FIXME better type?
|
||
}
|
||
if (type_size (fsym->type->t.func.type) > type_size (&type_param)) {
|
||
error (0, "return value too large to be passed by value");
|
||
fsym->type->t.func.type = &type_void;//FIXME better type?
|
||
}
|
||
for (p = params, i = 0; p; p = p->next, i++) {
|
||
if (!p->selector && !p->type && !p->name)
|
||
continue; // ellipsis marker
|
||
if (!p->type)
|
||
continue; // non-param selector
|
||
if (!type_size (p->type))
|
||
error (0, "parameter %d (‘%s’) has incomplete type",
|
||
i + 1, p->name);
|
||
if (type_size (p->type) > type_size (&type_param))
|
||
error (0, "param %d (‘%s’) is too large to be passed by value",
|
||
i + 1, p->name);
|
||
}
|
||
}
|
||
|
||
static void
|
||
build_scope (symbol_t *fsym, symtab_t *parent)
|
||
{
|
||
int i;
|
||
param_t *p;
|
||
symbol_t *args = 0;
|
||
symbol_t *param;
|
||
symtab_t *symtab;
|
||
symtab_t *cs = current_symtab;
|
||
|
||
check_function (fsym);
|
||
|
||
symtab = new_symtab (parent, stab_local);
|
||
fsym->s.func->symtab = symtab;
|
||
symtab->space = defspace_new ();
|
||
current_symtab = symtab;
|
||
|
||
if (fsym->type->t.func.num_params < 0) {
|
||
args = new_symbol_type (".args", &type_va_list);
|
||
initialize_def (args, args->type, 0, symtab->space, st_local);
|
||
}
|
||
|
||
for (p = fsym->params, i = 0; p; p = p->next) {
|
||
if (!p->selector && !p->type && !p->name)
|
||
continue; // ellipsis marker
|
||
if (!p->type)
|
||
continue; // non-param selector
|
||
param = new_symbol_type (p->name, p->type);
|
||
initialize_def (param, param->type, 0, symtab->space, st_local);
|
||
i++;
|
||
}
|
||
|
||
if (args) {
|
||
while (i < MAX_PARMS) {
|
||
param = new_symbol_type (va (".par%d", i), &type_param);
|
||
symtab_addsymbol (symtab, param);
|
||
i++;
|
||
}
|
||
}
|
||
current_symtab = cs;
|
||
}
|
||
|
||
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 == st_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 != st_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);
|
||
sym->s.func->def->relocs = 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;
|
||
|
||
if (options.code.debug) {
|
||
pr_lineno_t *lineno = new_lineno ();
|
||
sym->s.func->line_info = lineno - pr.linenos;
|
||
sym->s.func->local_defs = pr.num_locals;
|
||
}
|
||
|
||
build_scope (sym, parent);
|
||
return sym->s.func;
|
||
}
|
||
|
||
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->s.func);
|
||
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;
|
||
|
||
add_function (sym->s.func);
|
||
|
||
if (is_integer_val (bi_val))
|
||
bi = expr_integer (bi_val);
|
||
else
|
||
bi = expr_float (bi_val);
|
||
sym->s.func->builtin = bi;
|
||
reloc_def_func (sym->s.func, sym->s.func->def);
|
||
build_function (sym->s.func);
|
||
finish_function (sym->s.func);
|
||
|
||
// for debug info
|
||
//build_scope (f, f->def, sym->params);
|
||
//flush_scope (f->scope, 1);
|
||
return sym->s.func;
|
||
}
|
||
|
||
void
|
||
build_function (function_t *f)
|
||
{
|
||
// FIXME
|
||
// f->def->constant = 1;
|
||
// f->def->nosave = 1;
|
||
// f->def->initialized = 1;
|
||
// G_FUNCTION (f->def->ofs) = f->function_num;
|
||
}
|
||
|
||
void
|
||
finish_function (function_t *f)
|
||
{
|
||
}
|
||
|
||
void
|
||
emit_function (function_t *f, expr_t *e)
|
||
{
|
||
sblock_t *sblock;
|
||
|
||
f->code = pr.code->size;
|
||
lineno_base = f->def->line;
|
||
sblock = make_statements (e);
|
||
emit_statements (sblock);
|
||
}
|
||
|
||
int
|
||
function_parms (function_t *f, byte *parm_size)
|
||
{
|
||
//FIXME this is icky
|
||
int count, i;
|
||
|
||
if (f->sym->type->t.func.num_params >= 0)
|
||
count = f->sym->type->t.func.num_params;
|
||
else
|
||
count = -f->sym->type->t.func.num_params - 1;
|
||
|
||
for (i = 0; i < count; i++)
|
||
parm_size[i] = type_size (f->sym->type->t.func.param_types[i]);
|
||
return f->sym->type->t.func.num_params;
|
||
}
|