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quakeforge/tools/qfcc/source/expr_bool.c
Bill Currie 6d5ffa9f8e [build] Move to non-recursive make 
There's still some cleanup to do, but everything seems to be working
nicely: `make -j` works, `make distcheck` passes. There is probably
plenty of bitrot in the package directories (RPM, debian), though.

The vc project files have been removed since those versions are way out
of date and quakeforge is pretty much dependent on gcc now anyway.

Most of the old Makefile.am files  are now Makemodule.am.  This should
allow for new Makefile.am files that allow local building (to be added
on an as-needed bases).  The current remaining Makefile.am files are for
standalone sub-projects.a

The installable bins are currently built in the top-level build
directory. This may change if the clutter gets to be too much.

While this does make a noticeable difference in build times, the main
reason for the switch was to take care of the growing dependency issues:
now it's possible to build tools for code generation (eg, using qfcc and
ruamoko programs for code-gen).
2020-06-25 11:35:37 +09:00

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/*
expr_bool.c
short-circuit boolean expressions
Copyright (C) 2001 Bill Currie <bill@taniwha.org>
Author: Bill Currie <bill@taniwha.org>
Date: 2001/06/15
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/alloc.h"
#include "QF/dstring.h"
#include "QF/mathlib.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "tools/qfcc/include/qfcc.h"
#include "tools/qfcc/include/class.h"
#include "tools/qfcc/include/def.h"
#include "tools/qfcc/include/defspace.h"
#include "tools/qfcc/include/diagnostic.h"
#include "tools/qfcc/include/emit.h"
#include "tools/qfcc/include/expr.h"
#include "tools/qfcc/include/function.h"
#include "tools/qfcc/include/idstuff.h"
#include "tools/qfcc/include/method.h"
#include "tools/qfcc/include/options.h"
#include "tools/qfcc/include/reloc.h"
#include "tools/qfcc/include/shared.h"
#include "tools/qfcc/include/strpool.h"
#include "tools/qfcc/include/struct.h"
#include "tools/qfcc/include/symtab.h"
#include "tools/qfcc/include/type.h"
#include "tools/qfcc/include/value.h"
#include "tools/qfcc/source/qc-parse.h"
expr_t *
test_expr (expr_t *e)
{
static float zero[4] = {0, 0, 0, 0};
expr_t *new = 0;
type_t *type;
if (e->type == ex_error)
return e;
type = get_type (e);
if (e->type == ex_error)
return e;
switch (type->type) {
case ev_type_count:
internal_error (e, 0);
case ev_void:
if (options.traditional) {
if (options.warnings.traditional)
warning (e, "void has no value");
return e;
}
return error (e, "void has no value");
case ev_string:
if (!options.code.ifstring)
return new_alias_expr (type_default, e);
new = new_string_expr (0);
break;
case ev_uinteger:
case ev_integer:
case ev_short:
if (!is_integer(type_default)) {
if (is_constant (e)) {
return cast_expr (type_default, e);
}
return new_alias_expr (type_default, e);
}
return e;
case ev_float:
if (options.code.fast_float
|| options.code.progsversion == PROG_ID_VERSION) {
if (!is_float(type_default)) {
if (is_constant (e)) {
return cast_expr (type_default, e);
}
return new_alias_expr (type_default, e);
}
return e;
}
new = new_float_expr (0);
break;
case ev_double:
new = new_double_expr (0);
break;
case ev_vector:
new = new_vector_expr (zero);
break;
case ev_entity:
return new_alias_expr (type_default, e);
case ev_field:
return new_alias_expr (type_default, e);
case ev_func:
return new_alias_expr (type_default, e);
case ev_pointer:
return new_alias_expr (type_default, e);
case ev_quat:
new = new_quaternion_expr (zero);
break;
case ev_invalid:
if (is_enum (type)) {
new = new_nil_expr ();
break;
}
return test_error (e, get_type (e));
}
new->line = e->line;
new->file = e->file;
new = binary_expr (NE, e, new);
new->line = e->line;
new->file = e->file;
return new;
}
void
backpatch (ex_list_t *list, expr_t *label)
{
int i;
expr_t *e;
if (!list)
return;
if (!label || label->type != ex_label)
internal_error (label, "not a label");
for (i = 0; i < list->size; i++) {
e = list->e[i];
if (e->type == ex_uexpr && e->e.expr.op == 'g')
e->e.expr.e1 = label;
else if (e->type == ex_expr && (e->e.expr.op == 'i'
|| e->e.expr.op == 'n'))
e->e.expr.e2 = label;
else {
internal_error (e, 0);
}
label->e.label.used++;
}
}
static ex_list_t *
merge (ex_list_t *l1, ex_list_t *l2)
{
ex_list_t *m;
if (!l1 && !l2)
internal_error (0, 0);
if (!l2)
return l1;
if (!l1)
return l2;
m = malloc ((size_t)&((ex_list_t *)0)->e[l1->size + l2->size]);
m->size = l1->size + l2->size;
memcpy (m->e, l1->e, l1->size * sizeof (expr_t *));
memcpy (m->e + l1->size, l2->e, l2->size * sizeof (expr_t *));
return m;
}
static ex_list_t *
make_list (expr_t *e)
{
ex_list_t *m;
m = malloc ((size_t)&((ex_list_t *) 0)->e[1]);
m->size = 1;
m->e[0] = e;
return m;
}
expr_t *
bool_expr (int op, expr_t *label, expr_t *e1, expr_t *e2)
{
expr_t *block;
if (!options.code.short_circuit)
return binary_expr (op, e1, e2);
e1 = convert_bool (e1, 0);
if (e1->type == ex_error)
return e1;
e2 = convert_bool (e2, 0);
if (e2->type == ex_error)
return e2;
block = new_block_expr ();
append_expr (block, e1);
append_expr (block, label);
append_expr (block, e2);
switch (op) {
case OR:
backpatch (e1->e.bool.false_list, label);
return new_bool_expr (merge (e1->e.bool.true_list,
e2->e.bool.true_list),
e2->e.bool.false_list, block);
break;
case AND:
backpatch (e1->e.bool.true_list, label);
return new_bool_expr (e2->e.bool.true_list,
merge (e1->e.bool.false_list,
e2->e.bool.false_list), block);
break;
}
internal_error (e1, 0);
}
expr_t *
convert_bool (expr_t *e, int block)
{
expr_t *b;
if (e->type == ex_expr && e->e.expr.op == '=') {
expr_t *src;
if (!e->paren && options.warnings.precedence)
warning (e, "suggest parentheses around assignment "
"used as truth value");
src = e->e.expr.e2;
if (src->type == ex_block) {
src = new_temp_def_expr (get_type (src));
e = new_binary_expr (e->e.expr.op, e->e.expr.e1,
assign_expr (src, e->e.expr.e2));
}
b = convert_bool (src, 1);
if (b->type == ex_error)
return b;
// insert the assignment into the bool's block
e->next = b->e.bool.e->e.block.head;
b->e.bool.e->e.block.head = e;
if (b->e.bool.e->e.block.tail == &b->e.bool.e->e.block.head) {
// shouldn't happen, but just in case
b->e.bool.e->e.block.tail = &e->next;
}
return b;
}
if (e->type == ex_uexpr && e->e.expr.op == '!'
&& !is_string(get_type (e->e.expr.e1))) {
e = convert_bool (e->e.expr.e1, 0);
if (e->type == ex_error)
return e;
e = unary_expr ('!', e);
}
if (e->type != ex_bool) {
e = test_expr (e);
if (e->type == ex_error)
return e;
if (is_constant (e)) {
int val;
b = goto_expr (0);
if (is_integer_val (e)) {
val = expr_integer (e);
} else {
val = expr_float (e) != 0;
}
if (val)
e = new_bool_expr (make_list (b), 0, b);
else
e = new_bool_expr (0, make_list (b), b);
} else {
b = new_block_expr ();
append_expr (b, branch_expr ('i', e, 0));
append_expr (b, goto_expr (0));
e = new_bool_expr (make_list (b->e.block.head),
make_list (b->e.block.head->next), b);
}
}
if (block && e->e.bool.e->type != ex_block) {
expr_t *block = new_block_expr ();
append_expr (block, e->e.bool.e);
e->e.bool.e = block;
}
return e;
}
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