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quakeforge/tools/qfcc/source/expr.c
Bill Currie bbedbf5c9c Add the .return etc symbols to the symbol table. 
This puts their defs into the object file.
2011-03-05 08:37:51 +09:00

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/*
expr.c
expression construction and manipulations
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
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/mathlib.h>
#include <QF/sys.h>
#include <QF/va.h>
#include "qfcc.h"
#include "class.h"
#include "def.h"
#include "defspace.h"
#include "diagnostic.h"
#include "emit.h"
#include "expr.h"
#include "function.h"
#include "idstuff.h"
#include "immediate.h"
#include "method.h"
#include "options.h"
#include "reloc.h"
#include "strpool.h"
#include "struct.h"
#include "symtab.h"
#include "type.h"
#include "qc-parse.h"
static expr_t *free_exprs;
type_t *ev_types[ev_type_count] = {
&type_void,
&type_string,
&type_float,
&type_vector,
&type_entity,
&type_field,
&type_function,
&type_pointer,
&type_quaternion,
&type_integer,
&type_short,
&type_invalid,
};
void
convert_name (expr_t *e)
{
symbol_t *sym;
expr_t *new;
if (e->type != ex_symbol)
return;
sym = e->e.symbol;
if (!strcmp (sym->name, "__PRETTY_FUNCTION__")
&& current_func) {
new = new_string_expr (current_func->name);
goto convert;
}
if (!strcmp (sym->name, "__FUNCTION__")
&& current_func) {
new = new_string_expr (current_func->def->name);
goto convert;
}
if (!strcmp (sym->name, "__LINE__")
&& current_func) {
new = new_integer_expr (e->line);
goto convert;
}
if (!strcmp (sym->name, "__FILE__")
&& current_func) {
new = new_string_expr (GETSTR (e->file));
goto convert;
}
if (!sym->table) {
error (e, "%s undefined", sym->name);
sym->type = type_default;
//FIXME need a def
return;
}
if (sym->sy_type == sy_expr) {
new = copy_expr (sym->s.expr);
goto convert;
}
if (sym->sy_type == sy_type)
internal_error (e, "unexpected typedef");
// var, const and func shouldn't need extra handling
return;
convert:
e->type = new->type;
e->e = new->e;
}
type_t *
get_type (expr_t *e)
{
convert_name (e);
switch (e->type) {
case ex_label:
case ex_error:
return 0; // something went very wrong
case ex_bool:
if (options.code.progsversion == PROG_ID_VERSION)
return &type_float;
return &type_integer;
case ex_nil:
case ex_state:
return &type_void;
case ex_block:
if (e->e.block.result)
return get_type (e->e.block.result);
return &type_void;
case ex_expr:
case ex_uexpr:
return e->e.expr.type;
case ex_symbol:
return e->e.symbol->type;
case ex_temp:
return e->e.temp.type;
case ex_value:
if (e->e.value.type == ev_pointer)
return pointer_type (e->e.value.v.pointer.type);
if (e->e.value.type == ev_field)
return field_type (e->e.value.v.pointer.type);
if (e->e.value.type == ev_integer
&& options.code.progsversion == PROG_ID_VERSION) {
e->e.value.type = ev_float;
e->e.value.v.float_val = e->e.value.v.integer_val;
}
return ev_types[e->e.value.type];
}
return 0;
}
etype_t
extract_type (expr_t *e)
{
type_t *type = get_type (e);
if (type)
return type->type;
return ev_type_count;
}
expr_t *
type_mismatch (expr_t *e1, expr_t *e2, int op)
{
dstring_t *t1 = dstring_newstr ();
dstring_t *t2 = dstring_newstr ();
print_type_str (t1, get_type (e1));
print_type_str (t2, get_type (e2));
e1 = error (e1, "type mismatch: %s %s %s",
t1->str, get_op_string (op), t2->str);
dstring_delete (t1);
dstring_delete (t2);
return e1;
}
expr_t *
param_mismatch (expr_t *e, int param, const char *fn, type_t *t1, type_t *t2)
{
dstring_t *s1 = dstring_newstr ();
dstring_t *s2 = dstring_newstr ();
print_type_str (s1, t1);
print_type_str (s2, t2);
e = error (e, "type mismatch for parameter %d of %s: expected %s, got %s",
param, fn, s1->str, s2->str);
dstring_delete (s1);
dstring_delete (s2);
return e;
}
expr_t *
cast_error (expr_t *e, type_t *t1, type_t *t2)
{
dstring_t *s1 = dstring_newstr ();
dstring_t *s2 = dstring_newstr ();
print_type_str (s1, t1);
print_type_str (s2, t2);
e = error (e, "can not cast from %s to %s", s1->str, s2->str);
dstring_delete (s1);
dstring_delete (s2);
return e;
}
expr_t *
test_error (expr_t *e, type_t *t)
{
dstring_t *s = dstring_newstr ();
print_type_str (s, t);
e = error (e, "%s cannot be tested", s->str);
dstring_delete (s);
return e;
}
expr_t *
new_expr (void)
{
expr_t *e;
ALLOC (16384, expr_t, exprs, e);
e->line = pr.source_line;
e->file = pr.source_file;
return e;
}
expr_t *
copy_expr (expr_t *e)
{
expr_t *n;
expr_t *t;
if (!e)
return 0;
switch (e->type) {
case ex_error:
case ex_symbol:
case ex_nil:
case ex_value:
// nothing to do here
n = new_expr ();
*n = *e;
n->line = pr.source_line;
n->file = pr.source_file;
return n;
case ex_state:
return new_state_expr (copy_expr (e->e.state.frame),
copy_expr (e->e.state.think),
copy_expr (e->e.state.step));
case ex_bool:
n = new_expr ();
*n = *e;
n->line = pr.source_line;
n->file = pr.source_file;
if (e->e.bool.true_list) {
int count = e->e.bool.true_list->size;
size_t size = (size_t)&((ex_list_t *) 0)->e[count];
n->e.bool.true_list = malloc (size);
while (count--)
n->e.bool.true_list->e[count] =
copy_expr ( e->e.bool.true_list->e[count]);
}
if (e->e.bool.false_list) {
int count = e->e.bool.false_list->size;
size_t size = (size_t)&((ex_list_t *) 0)->e[count];
n->e.bool.false_list = malloc (size);
while (count--)
n->e.bool.false_list->e[count] =
copy_expr ( e->e.bool.false_list->e[count]);
}
n->e.bool.e = copy_expr (e->e.bool.e);
return n;
case ex_label:
/// Create a fresh label
return new_label_expr ();
case ex_block:
n = new_expr ();
*n = *e;
n->line = pr.source_line;
n->file = pr.source_file;
n->e.block.head = 0;
n->e.block.tail = &n->e.block.head;
n->e.block.result = 0;
for (t = e->e.block.head; t; t = t->next) {
if (t == e->e.block.result) {
n->e.block.result = copy_expr (t);
append_expr (n, n->e.block.result);
} else {
append_expr (n, copy_expr (t));
}
}
if (e->e.block.result && !n->e.block.result) {
error (e, "internal: bogus block result?");
abort ();
}
break;
case ex_expr:
n = new_expr ();
*n = *e;
n->line = pr.source_line;
n->file = pr.source_file;
n->e.expr.e1 = copy_expr (e->e.expr.e1);
n->e.expr.e2 = copy_expr (e->e.expr.e2);
return n;
case ex_uexpr:
n = new_expr ();
*n = *e;
n->line = pr.source_line;
n->file = pr.source_file;
n->e.expr.e1 = copy_expr (e->e.expr.e1);
return n;
case ex_temp:
n = new_expr ();
*n = *e;
n->line = pr.source_line;
n->file = pr.source_file;
n->e.temp.expr = copy_expr (e->e.temp.expr);
return n;
}
error (e, "internal: invalid expression");
abort ();
}
const char *
new_label_name (void)
{
static int label = 0;
int lnum = ++label;
const char *fname = current_func->sym->name;
char *lname;
lname = nva ("$%s_%d", fname, lnum);
SYS_CHECKMEM (lname);
return lname;
}
static expr_t *
new_error_expr (void)
{
expr_t *e = new_expr ();
e->type = ex_error;
return e;
}
expr_t *
new_state_expr (expr_t *frame, expr_t *think, expr_t *step)
{
expr_t *s = new_expr ();
s->type = ex_state;
s->e.state.frame = frame;
s->e.state.think = think;
s->e.state.step = step;
return s;
}
expr_t *
new_bool_expr (ex_list_t *true_list, ex_list_t *false_list, expr_t *e)
{
expr_t *b = new_expr ();
b->type = ex_bool;
b->e.bool.true_list = true_list;
b->e.bool.false_list = false_list;
b->e.bool.e = e;
return b;
}
expr_t *
new_label_expr (void)
{
expr_t *l = new_expr ();
l->type = ex_label;
l->e.label.name = new_label_name ();
return l;
}
expr_t *
new_block_expr (void)
{
expr_t *b = new_expr ();
b->type = ex_block;
b->e.block.head = 0;
b->e.block.tail = &b->e.block.head;
return b;
}
expr_t *
new_binary_expr (int op, expr_t *e1, expr_t *e2)
{
expr_t *e = new_expr ();
if (e1->type == ex_error)
return e1;
if (e2 && e2->type == ex_error)
return e2;
e->type = ex_expr;
e->e.expr.op = op;
e->e.expr.e1 = e1;
e->e.expr.e2 = e2;
return e;
}
expr_t *
new_unary_expr (int op, expr_t *e1)
{
expr_t *e = new_expr ();
if (e1 && e1->type == ex_error)
return e1;
e->type = ex_uexpr;
e->e.expr.op = op;
e->e.expr.e1 = e1;
return e;
}
expr_t *
new_symbol_expr (symbol_t *symbol)
{
expr_t *e = new_expr ();
e->type = ex_symbol;
e->e.symbol = symbol;
return e;
}
expr_t *
new_temp_def_expr (type_t *type)
{
expr_t *e = new_expr ();
e->type = ex_temp;
e->e.temp.type = type;
return e;
}
expr_t *
new_nil_expr (void)
{
expr_t *e = new_expr ();
e->type = ex_nil;
return e;
}
expr_t *
new_name_expr (const char *name)
{
expr_t *e = new_expr ();
symbol_t *sym;
sym = symtab_lookup (current_symtab, name);
if (!sym)
sym = new_symbol (name);
e->type = ex_symbol;
e->e.symbol = sym;
return e;
}
expr_t *
new_string_expr (const char *string_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_string;
e->e.value.v.string_val = string_val;
return e;
}
expr_t *
new_float_expr (float float_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_float;
e->e.value.v.float_val = float_val;
return e;
}
expr_t *
new_vector_expr (const float *vector_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_vector;
VectorCopy (vector_val, e->e.value.v.vector_val);
return e;
}
expr_t *
new_entity_expr (int entity_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_entity;
e->e.value.v.entity_val = entity_val;
return e;
}
expr_t *
new_field_expr (int field_val, type_t *type, def_t *def)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_field;
e->e.value.v.pointer.val = field_val;
e->e.value.v.pointer.type = type;
e->e.value.v.pointer.def = def;
return e;
}
expr_t *
new_func_expr (int func_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_func;
e->e.value.v.func_val = func_val;
return e;
}
expr_t *
new_pointer_expr (int val, type_t *type, def_t *def)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_pointer;
e->e.value.v.pointer.val = val;
e->e.value.v.pointer.type = type;
e->e.value.v.pointer.def = def;
return e;
}
expr_t *
new_quaternion_expr (const float *quaternion_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_quat;
QuatCopy (quaternion_val, e->e.value.v.quaternion_val);
return e;
}
expr_t *
new_integer_expr (int integer_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_integer;
e->e.value.v.integer_val = integer_val;
return e;
}
expr_t *
new_short_expr (short short_val)
{
expr_t *e = new_expr ();
e->type = ex_value;
e->e.value.type = ev_short;
e->e.value.v.short_val = short_val;
return e;
}
int
is_constant (expr_t *e)
{
if (e->type == ex_nil || e->type == ex_value
|| (e->type == ex_symbol && e->e.symbol->sy_type == sy_const))
return 1;
return 0;
}
expr_t *
constant_expr (expr_t *e)
{
expr_t *new;
if (!is_constant (e))
return e;
if (e->type == ex_nil || e->type == ex_value)
return e;
if (e->type != ex_symbol || e->e.symbol->sy_type != sy_const)
return e;
new = new_expr ();
new->type = ex_value;
new->line = e->line;
new->file = e->file;
new->e.value = e->e.symbol->s.value;
return new;
}
int
is_string_val (expr_t *e)
{
if (e->type == ex_nil)
return 1;
if (e->type == ex_value && e->e.value.type == ev_string)
return 1;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_string)
return 1;
return 0;
}
const char *
expr_string (expr_t *e)
{
if (e->type == ex_nil)
return 0;
if (e->type == ex_value && e->e.value.type == ev_string)
return e->e.value.v.string_val;
//if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
// && e->e.symbol->type->type == ev_string)
// return e->e.symbol->s.value;
internal_error (e, "not a string constant");
}
int
is_float_val (expr_t *e)
{
if (e->type == ex_nil)
return 1;
if (e->type == ex_value && e->e.value.type == ev_float)
return 1;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_float)
return 1;
return 0;
}
float
expr_float (expr_t *e)
{
if (e->type == ex_nil)
return 0;
if (e->type == ex_value && e->e.value.type == ev_float)
return e->e.value.v.float_val;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_float)
return e->e.symbol->s.value.v.float_val;
internal_error (e, "not a float constant");
}
int
is_vector_val (expr_t *e)
{
if (e->type == ex_nil)
return 1;
if (e->type == ex_value && e->e.value.type == ev_vector)
return 1;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_vector)
return 1;
return 0;
}
const float *
expr_vector (expr_t *e)
{
if (e->type == ex_nil)
return vec3_origin;
if (e->type == ex_value && e->e.value.type == ev_vector)
return e->e.value.v.vector_val;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_vector)
return e->e.symbol->s.value.v.vector_val;
internal_error (e, "not a vector constant");
}
int
is_quaternion_val (expr_t *e)
{
if (e->type == ex_nil)
return 1;
if (e->type == ex_value && e->e.value.type == ev_quat)
return 1;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_quat)
return 1;
return 0;
}
const float *
expr_quaternion (expr_t *e)
{
if (e->type == ex_nil)
return quat_origin;
if (e->type == ex_value && e->e.value.type == ev_quat)
return e->e.value.v.quaternion_val;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_quat)
return e->e.symbol->s.value.v.quaternion_val;
internal_error (e, "not a quaternion constant");
}
int
is_integer_val (expr_t *e)
{
if (e->type == ex_nil)
return 1;
if (e->type == ex_value && e->e.value.type == ev_integer)
return 1;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& (e->e.symbol->type->type == ev_integer
|| is_enum (e->e.symbol->type)))
return 1;
return 0;
}
int
expr_integer (expr_t *e)
{
if (e->type == ex_nil)
return 0;
if (e->type == ex_value && e->e.value.type == ev_integer)
return e->e.value.v.integer_val;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& (e->e.symbol->type->type == ev_integer
|| is_enum (e->e.symbol->type)))
return e->e.symbol->s.value.v.integer_val;
internal_error (e, "not an integer constant");
}
int
is_short_val (expr_t *e)
{
if (e->type == ex_nil)
return 1;
if (e->type == ex_value && e->e.value.type == ev_short)
return 1;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_short)
return 1;
return 0;
}
short
expr_short (expr_t *e)
{
if (e->type == ex_nil)
return 0;
if (e->type == ex_value && e->e.value.type == ev_short)
return e->e.value.v.short_val;
if (e->type == ex_symbol && e->e.symbol->sy_type == sy_const
&& e->e.symbol->type->type == ev_short)
return e->e.symbol->s.value.v.short_val;
internal_error (e, "not a short constant");
}
expr_t *
new_self_expr (void)
{
symbol_t *sym;
sym = make_symbol (".self", &type_entity, 0, st_extern);
if (!sym->table)
symtab_addsymbol (pr.symtab, sym);
return new_symbol_expr (sym);
}
expr_t *
new_this_expr (void)
{
symbol_t *sym;
sym = make_symbol (".this", field_type (&type_id), 0, st_extern);
if (!sym->table)
symtab_addsymbol (pr.symtab, sym);
return new_symbol_expr (sym);
}
expr_t *
new_alias_expr (type_t *type, expr_t *expr)
{
expr_t *alias;
alias = new_unary_expr ('A', expr);
alias->e.expr.type = type;
return alias;
}
static expr_t *
param_expr (const char *name, type_t *type)
{
symbol_t *sym;
expr_t *sym_expr;
sym = make_symbol (name, &type_param, pr.symtab->space, st_extern);
if (!sym->table)
symtab_addsymbol (pr.symtab, sym);
sym_expr = new_symbol_expr (sym);
return new_alias_expr (type, sym_expr);
}
expr_t *
new_ret_expr (type_t *type)
{
return param_expr (".return", type);
}
expr_t *
new_param_expr (type_t *type, int num)
{
return param_expr (va (".param_%d", num), type);
}
expr_t *
new_move_expr (expr_t *e1, expr_t *e2, type_t *type)
{
expr_t *e = new_binary_expr ('M', e1, e2);
e->e.expr.type = type;
return e;
}
expr_t *
append_expr (expr_t *block, expr_t *e)
{
if (block->type != ex_block)
abort ();
if (!e || e->type == ex_error)
return block;
if (e->next) {
error (e, "append_expr: expr loop detected");
abort ();
}
*block->e.block.tail = e;
block->e.block.tail = &e->next;
return block;
}
static expr_t *
field_expr (expr_t *e1, expr_t *e2)
{
type_t *t1, *t2;
expr_t *e;
if (e1->type == ex_error)
return e1;
t1 = get_type (e1);
if (t1->type == ev_entity) {
t2 = get_type (e2);
if (t2->type == ev_field) {
e = new_binary_expr ('.', e1, e2);
e->e.expr.type = t2->t.fldptr.type;
return e;
}
} else if (t1->type == ev_pointer) {
if (is_struct (t1->t.fldptr.type)) {
type_t *struct_type = t1->t.fldptr.type;
symtab_t *strct = struct_type->t.symtab;
symbol_t *sym = e2->e.symbol;//FIXME need to check
symbol_t *field;
if (!strct)
return error (e1, "dereferencing pointer to incomplete type");
field = symtab_lookup (strct, sym->name);
if (!field)
return error (e2, "'%s' has no member named '%s'",
struct_type->name + 4, sym->name);
e2->type = ex_value;
e2->e.value.type = ev_short;
e2->e.value.v.short_val = field->s.offset;
e = new_binary_expr ('&', e1, e2);
e->e.expr.type = pointer_type (field->type);
return unary_expr ('.', e);
} else if (is_class (t1->t.fldptr.type)) {
class_t *class = t1->t.fldptr.type->t.class;
symbol_t *sym = e2->e.symbol;//FIXME need to check
symbol_t *ivar;
ivar = class_find_ivar (class, vis_protected, sym->name);
if (!ivar)
return new_error_expr ();
e2->type = ex_value;
e2->e.value.type = ev_short;
e2->e.value.v.short_val = ivar->s.offset;
e = new_binary_expr ('&', e1, e2);
e->e.expr.type = pointer_type (ivar->type);
return unary_expr ('.', e);
}
} else if (t1->type == ev_vector) {
} else if (t1->type == ev_quat) {
} else if (is_struct (t1)) {
symtab_t *strct = t1->t.symtab;
symbol_t *sym = e2->e.symbol;//FIXME need to check
symbol_t *field;
if (!strct)
return error (e1, "dereferencing pointer to incomplete type");
field = symtab_lookup (strct, sym->name);
if (!field)
return error (e2, "'%s' has no member named '%s'",
t1->name + 4, sym->name);
e2->type = ex_value;
e2->e.value.type = ev_short;
e2->e.value.v.short_val = field->s.offset;
e = address_expr (e1, e2, field->type);
return unary_expr ('.', e);
} else if (is_class (t1)) {
}
return type_mismatch (e1, e2, '.');
}
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:
new = new_string_expr (0);
break;
// case ev_uinteger:
case ev_integer:
case ev_short:
if (type_default != &type_integer)
return new_alias_expr (type_default, e);
return e;
case ev_float:
if (options.code.fast_float
|| options.code.progsversion == PROG_ID_VERSION) {
if (type_default != &type_float)
return new_alias_expr (type_default, e);
return e;
}
new = new_float_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 *
convert_bool (expr_t *e, int block)
{
expr_t *b;
if (e->type == ex_expr && (e->e.expr.op == '=' || e->e.expr.op == PAS)
&& !e->paren) {
if (options.warnings.precedence)
warning (e, "suggest parentheses around assignment "
"used as truth value");
}
if (e->type == ex_uexpr && e->e.expr.op == '!') {
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_integer_val (e)) {
b = goto_expr (0);
if (expr_integer (e))
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;
}
static expr_t *
convert_from_bool (expr_t *e, type_t *type)
{
expr_t *zero;
expr_t *one;
expr_t *cond;
if (type == &type_float) {
one = new_float_expr (1);
zero = new_float_expr (0);
} else if (type == &type_integer) {
one = new_integer_expr (1);
zero = new_integer_expr (0);
} else if (is_enum (type) && enum_as_bool (type, &zero, &one)) {
// don't need to do anything
// } else if (type == &type_uinteger) {
// one = new_uinteger_expr (1);
// zero = new_uinteger_expr (0);
} else {
return error (e, "can't convert from bool value");
}
cond = new_expr ();
*cond = *e;
cond->next = 0;
cond = conditional_expr (cond, one, zero);
e->type = cond->type;
e->e = cond->e;
return e;
}
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);
}
void
convert_int (expr_t *e)
{
e->e.value.v.float_val = expr_integer (e);
e->e.value.type = ev_float;
e->type = ex_value;
}
void
convert_short (expr_t *e)
{
e->e.value.v.float_val = expr_short (e);
e->e.value.type = ev_float;
e->type = ex_value;
}
void
convert_short_int (expr_t *e)
{
e->e.value.v.integer_val = expr_short (e);
e->e.value.type = ev_integer;
e->type = ex_value;
}
void
convert_nil (expr_t *e, type_t *t)
{
memset (&e->e.value, 0, sizeof (e->e.value));
e->e.value.type = low_level_type (t);
if (t->type == ev_pointer || t->type == ev_field)
e->e.value.v.pointer.type = t->t.fldptr.type;
e->type = ex_value;
}
int
is_compare (int op)
{
if (op == EQ || op == NE || op == LE || op == GE || op == LT || op == GT
|| op == '>' || op == '<')
return 1;
return 0;
}
int
is_math_op (int op)
{
if (op == '*' || op == '/' || op == '+' || op == '-')
return 1;
return 0;
}
int
is_logic (int op)
{
if (op == OR || op == AND)
return 1;
return 0;
}
static expr_t *
check_precedence (int op, expr_t *e1, expr_t *e2)
{
if (e1->type == ex_uexpr && e1->e.expr.op == '!' && !e1->paren) {
if (options.traditional) {
if (op != AND && op != OR && op != '=') {
notice (e1, "precedence of `!' and `%s' inverted for "
"traditional code", get_op_string (op));
e1->e.expr.e1->paren = 1;
return unary_expr ('!', binary_expr (op, e1->e.expr.e1, e2));
}
} else if (op == '&' || op == '|') {
if (options.warnings.precedence)
warning (e1, "ambiguous logic. Suggest explicit parentheses "
"with expressions involving ! and %s",
get_op_string (op));
}
}
if (options.traditional) {
if (e2->type == ex_expr && !e2->paren) {
if (((op == '&' || op == '|')
&& (is_math_op (e2->e.expr.op) || is_compare (e2->e.expr.op)))
|| (op == '='
&& (e2->e.expr.op == OR || e2->e.expr.op == AND))) {
notice (e1, "precedence of `%s' and `%s' inverted for "
"traditional code", get_op_string (op),
get_op_string (e2->e.expr.op));
e1 = binary_expr (op, e1, e2->e.expr.e1);
e1->paren = 1;
return binary_expr (e2->e.expr.op, e1, e2->e.expr.e2);
}
if (((op == EQ || op == NE) && is_compare (e2->e.expr.op))
|| (op == OR && e2->e.expr.op == AND)
|| (op == '|' && e2->e.expr.op == '&')) {
notice (e1, "precedence of `%s' raised to `%s' for "
"traditional code", get_op_string (op),
get_op_string (e2->e.expr.op));
e1 = binary_expr (op, e1, e2->e.expr.e1);
e1->paren = 1;
return binary_expr (e2->e.expr.op, e1, e2->e.expr.e2);
}
} else if (e1->type == ex_expr && !e1->paren) {
if (((op == '&' || op == '|')
&& (is_math_op (e1->e.expr.op) || is_compare (e1->e.expr.op)))
|| (op == '='
&& (e1->e.expr.op == OR || e1->e.expr.op == AND))) {
notice (e1, "precedence of `%s' and `%s' inverted for "
"traditional code", get_op_string (op),
get_op_string (e1->e.expr.op));
e2 = binary_expr (op, e1->e.expr.e2, e2);
e2->paren = 1;
return binary_expr (e1->e.expr.op, e1->e.expr.e1, e2);
}
}
} else {
if (e2->type == ex_expr && !e2->paren) {
if ((op == '&' || op == '|' || op == '^')
&& (is_math_op (e2->e.expr.op)
|| is_compare (e2->e.expr.op))) {
if (options.warnings.precedence)
warning (e2, "suggest parentheses around %s in "
"operand of %c",
is_compare (e2->e.expr.op)
? "comparison"
: get_op_string (e2->e.expr.op),
op);
}
}
if (e1->type == ex_expr && !e1->paren) {
if ((op == '&' || op == '|' || op == '^')
&& (is_math_op (e1->e.expr.op)
|| is_compare (e1->e.expr.op))) {
if (options.warnings.precedence)
warning (e1, "suggest parentheses around %s in "
"operand of %c",
is_compare (e1->e.expr.op)
? "comparison"
: get_op_string (e1->e.expr.op),
op);
}
}
}
return 0;
}
static int
has_function_call (expr_t *e)
{
switch (e->type) {
case ex_bool:
return has_function_call (e->e.bool.e);
case ex_block:
if (e->e.block.is_call)
return 1;
for (e = e->e.block.head; e; e = e->next)
if (has_function_call (e))
return 1;
return 0;
case ex_expr:
if (e->e.expr.op == 'c')
return 1;
return (has_function_call (e->e.expr.e1)
|| has_function_call (e->e.expr.e2));
case ex_uexpr:
if (e->e.expr.op != 'g')
return has_function_call (e->e.expr.e1);
default:
return 0;
}
}
expr_t *
binary_expr (int op, expr_t *e1, expr_t *e2)
{
type_t *t1, *t2;
type_t *type = 0;
expr_t *e;
if (e1->type == ex_error)
return e1;
if (e2->type == ex_error)
return e2;
convert_name (e1);
if (e1->type == ex_block && e1->e.block.is_call
&& has_function_call (e2) && e1->e.block.result) {
e = new_temp_def_expr (get_type (e1->e.block.result));
e1 = assign_expr (e, e1);
}
if (op == '.')
return field_expr (e1, e2);
convert_name (e2);
if (op == OR || op == AND) {
e1 = test_expr (e1);
e2 = test_expr (e2);
}
if (e1->type == ex_error)
return e1;
if (e2->type == ex_error)
return e2;
t1 = get_type (e1);
t2 = get_type (e2);
if (!t1 || !t2) {
internal_error (e1, 0);
}
if (op == EQ || op == NE) {
if (e1->type == ex_nil) {
t1 = t2;
convert_nil (e1, t1);
} else if (e2->type == ex_nil) {
t2 = t1;
convert_nil (e2, t2);
}
}
if (e1->type == ex_bool)
e1 = convert_from_bool (e1, t2);
if (e2->type == ex_bool)
e2 = convert_from_bool (e2, t1);
if ((e = check_precedence (op, e1, e2)))
return e;
type = t1;
if (is_compare (op) || is_logic (op)) {
if (options.code.progsversion > PROG_ID_VERSION)
type = &type_integer;
else
type = &type_float;
} else if (op == '*' && t1 == &type_vector && t2 == &type_vector) {
type = &type_float;
}
if (!type)
internal_error (e1, 0);
if (options.code.progsversion == PROG_ID_VERSION) {
switch (op) {
case '%':
{
expr_t *tmp1, *tmp2, *tmp3, *t1, *t2;
e = new_block_expr ();
t1 = new_temp_def_expr (&type_float);
t2 = new_temp_def_expr (&type_float);
tmp1 = new_temp_def_expr (&type_float);
tmp2 = new_temp_def_expr (&type_float);
tmp3 = new_temp_def_expr (&type_float);
append_expr (e, assign_expr (t1, e1));
e1 = binary_expr ('&', t1, t1);
append_expr (e, assign_expr (tmp1, e1));
append_expr (e, assign_expr (t2, e2));
e2 = binary_expr ('&', t2, t2);
append_expr (e, assign_expr (tmp2, e2));
e1 = binary_expr ('/', tmp1, tmp2);
append_expr (e, assign_expr (tmp3, e1));
e2 = binary_expr ('&', tmp3, tmp3);
append_expr (e, assign_expr (tmp3, e2));
e1 = binary_expr ('*', tmp2, tmp3);
e2 = binary_expr ('-', tmp1, e1);
e->e.block.result = e2;
return e;
}
break;
}
}
e = new_binary_expr (op, e1, e2);
e->e.expr.type = type;
return e;
}
expr_t *
asx_expr (int op, expr_t *e1, expr_t *e2)
{
if (e1->type == ex_error)
return e1;
else if (e2->type == ex_error)
return e2;
else {
expr_t *e = new_expr ();
*e = *e1;
e2->paren = 1;
return assign_expr (e, binary_expr (op, e1, e2));
}
}
expr_t *
unary_expr (int op, expr_t *e)
{
vec3_t v;
quat_t q;
const char *s;
convert_name (e);
if (e->type == ex_error)
return e;
switch (op) {
case '-':
if (!is_math (get_type (e)))
return error (e, "invalid type for unary +");
if (is_constant (e)) {
switch (extract_type (e)) {
case ev_string:
case ev_entity:
case ev_field:
case ev_func:
case ev_pointer:
internal_error (e, "type check failed!");
case ev_float:
return new_float_expr (-expr_float (e));
case ev_vector:
VectorNegate (expr_vector (e), v);
return new_vector_expr (v);
case ev_quat:
QuatNegate (expr_vector (e), q);
return new_vector_expr (q);
case ev_integer:
return new_integer_expr (-expr_integer (e));
case ev_short:
return new_short_expr (-expr_short (e));
case ev_invalid:
case ev_type_count:
case ev_void:
break;
}
internal_error (e, "weird expression type");
}
switch (e->type) {
case ex_value: // should be handled above
case ex_error:
case ex_label:
case ex_state:
internal_error (e, 0);
case ex_uexpr:
if (e->e.expr.op == '-')
return e->e.expr.e1;
case ex_block:
if (!e->e.block.result)
return error (e, "invalid type for unary -");
case ex_expr:
case ex_bool:
case ex_temp:
{
expr_t *n = new_unary_expr (op, e);
n->e.expr.type = e->e.expr.type;
return n;
}
case ex_symbol:
{
expr_t *n = new_unary_expr (op, e);
n->e.expr.type = e->e.symbol->type;
return n;
}
case ex_nil:
return error (e, "invalid type for unary -");
}
break;
case '!':
if (is_constant (e)) {
switch (extract_type (e)) {
case ev_entity:
case ev_field:
case ev_func:
case ev_pointer:
internal_error (e, 0);
case ev_string:
s = expr_string (e);
return new_integer_expr (!s || !s[0]);
case ev_float:
return new_integer_expr (!expr_float (e));
case ev_vector:
return new_integer_expr (!VectorIsZero (expr_vector (e)));
case ev_quat:
return new_integer_expr (!QuatIsZero (expr_quaternion (e)));
case ev_integer:
return new_integer_expr (!expr_integer (e));
case ev_short:
return new_short_expr (!expr_short (e));
case ev_invalid:
case ev_type_count:
case ev_void:
break;
}
internal_error (e, "weird expression type");
}
switch (e->type) {
case ex_value: // should be handled above
case ex_error:
case ex_label:
case ex_state:
internal_error (e, 0);
case ex_bool:
return new_bool_expr (e->e.bool.false_list,
e->e.bool.true_list, e);
case ex_block:
if (!e->e.block.result)
return error (e, "invalid type for unary !");
case ex_uexpr:
case ex_expr:
case ex_symbol:
case ex_temp:
{
expr_t *n = new_unary_expr (op, e);
if (options.code.progsversion > PROG_ID_VERSION)
n->e.expr.type = &type_integer;
else
n->e.expr.type = &type_float;
return n;
}
case ex_nil:
return error (e, "invalid type for unary !");
}
break;
case '~':
if (is_constant (e)) {
switch (extract_type (e)) {
case ev_string:
case ev_entity:
case ev_field:
case ev_func:
case ev_pointer:
case ev_vector:
return error (e, "invalid type for unary -");
case ev_float:
return new_float_expr (~(int) expr_float (e));
case ev_quat:
QuatConj (expr_vector (e), q);
return new_vector_expr (q);
case ev_integer:
return new_integer_expr (~expr_integer (e));
case ev_short:
return new_short_expr (~expr_short (e));
case ev_invalid:
case ev_type_count:
case ev_void:
break;
}
internal_error (e, "weird expression type");
}
switch (e->type) {
case ex_value: // should be handled above
case ex_error:
case ex_label:
case ex_state:
internal_error (e, 0);
case ex_uexpr:
if (e->e.expr.op == '~')
return e->e.expr.e1;
goto bitnot_expr;
case ex_block:
if (!e->e.block.result)
return error (e, "invalid type for unary ~");
goto bitnot_expr;
case ex_expr:
case ex_bool:
case ex_symbol:
case ex_temp:
bitnot_expr:
if (options.code.progsversion == PROG_ID_VERSION) {
expr_t *n1 = new_integer_expr (-1);
return binary_expr ('-', n1, e);
} else {
expr_t *n = new_unary_expr (op, e);
type_t *t = get_type (e);
if (t != &type_integer && t != &type_float
&& t != &type_quaternion)
return error (e, "invalid type for unary ~");
n->e.expr.type = t;
return n;
}
case ex_nil:
return error (e, "invalid type for unary ~");
}
break;
case '.':
if (extract_type (e) != ev_pointer)
return error (e, "invalid type for unary .");
e = new_unary_expr ('.', e);
e->e.expr.type = get_type (e->e.expr.e1)->t.fldptr.type;
return e;
case '+':
if (!is_math (get_type (e)))
return error (e, "invalid type for unary +");
return e;
}
internal_error (e, 0);
}
expr_t *
build_function_call (expr_t *fexpr, type_t *ftype, expr_t *params)
{
expr_t *e;
int arg_count = 0, parm_count = 0;
int i;
expr_t *args = 0, **a = &args;
type_t *arg_types[MAX_PARMS];
expr_t *arg_exprs[MAX_PARMS][2];
int arg_expr_count = 0;
expr_t *call;
expr_t *err = 0;
for (e = params; e; e = e->next) {
if (e->type == ex_error)
return e;
arg_count++;
}
if (arg_count > MAX_PARMS) {
return error (fexpr, "more than %d parameters", MAX_PARMS);
}
if (ftype->t.func.num_params < -1) {
if (-arg_count > ftype->t.func.num_params + 1) {
if (!options.traditional)
return error (fexpr, "too few arguments");
if (options.warnings.traditional)
warning (fexpr, "too few arguments");
}
parm_count = -ftype->t.func.num_params - 1;
} else if (ftype->t.func.num_params >= 0) {
if (arg_count > ftype->t.func.num_params) {
return error (fexpr, "too many arguments");
} else if (arg_count < ftype->t.func.num_params) {
if (!options.traditional)
return error (fexpr, "too few arguments");
if (options.warnings.traditional)
warning (fexpr, "too few arguments");
}
parm_count = ftype->t.func.num_params;
}
for (i = arg_count - 1, e = params; i >= 0; i--, e = e->next) {
type_t *t = get_type (e);
if (!type_size (t))
err = error (e, "type of formal parameter %d is incomplete",
i + 1);
if (type_size (t) > type_size (&type_param))
err = error (e, "formal parameter %d is too large to be passed by"
" value", i + 1);
if (ftype->t.func.param_types[i] == &type_float
&& is_integer_val (e)) {
convert_int (e);
t = &type_float;
}
if (i < parm_count) {
if (e->type == ex_nil)
convert_nil (e, t = ftype->t.func.param_types[i]);
if (e->type == ex_bool)
convert_from_bool (e, ftype->t.func.param_types[i]);
if (e->type == ex_error)
return e;
if (!type_assignable (ftype->t.func.param_types[i], t)) {
err = param_mismatch (e, i + 1, fexpr->e.symbol->name,
ftype->t.func.param_types[i], t);
}
t = ftype->t.func.param_types[i];
} else {
if (e->type == ex_nil)
convert_nil (e, t = type_nil);
if (e->type == ex_bool)
convert_from_bool (e, get_type (e));
if (is_integer_val (e)
&& options.code.progsversion == PROG_ID_VERSION)
convert_int (e);
if (is_integer_val (e) && options.warnings.vararg_integer)
warning (e, "passing integer constant into ... function");
}
arg_types[arg_count - 1 - i] = t;
}
if (err)
return err;
call = new_block_expr ();
call->e.block.is_call = 1;
for (e = params, i = 0; e; e = e->next, i++) {
if (has_function_call (e)) {
*a = new_temp_def_expr (arg_types[i]);
arg_exprs[arg_expr_count][0] = cast_expr (arg_types[i], e);
arg_exprs[arg_expr_count][1] = *a;
arg_expr_count++;
} else {
*a = cast_expr (arg_types[i], e);
}
a = &(*a)->next;
}
for (i = 0; i < arg_expr_count - 1; i++) {
append_expr (call, assign_expr (arg_exprs[i][1], arg_exprs[i][0]));
}
if (arg_expr_count) {
e = assign_expr (arg_exprs[arg_expr_count - 1][1],
arg_exprs[arg_expr_count - 1][0]);
append_expr (call, e);
}
e = new_binary_expr ('c', fexpr, args);
e->e.expr.type = ftype->t.func.type;
append_expr (call, e);
if (ftype->t.func.type != &type_void) {
call->e.block.result = new_ret_expr (ftype->t.func.type);
} else if (options.traditional) {
call->e.block.result = new_ret_expr (&type_float);
}
return call;
}
expr_t *
function_expr (expr_t *fexpr, expr_t *params)
{
type_t *ftype;
find_function (fexpr, params);
ftype = get_type (fexpr);
if (fexpr->type == ex_error)
return fexpr;
if (ftype->type != ev_func) {
if (fexpr->type == ex_symbol)
return error (fexpr, "Called object \"%s\" is not a function",
fexpr->e.symbol->name);
else
return error (fexpr, "Called object is not a function");
}
if (fexpr->type == ex_symbol && params && is_string_val (params)) {
// FIXME eww, I hate this, but it's needed :(
// FIXME make a qc hook? :)
if (strncmp (fexpr->e.symbol->name, "precache_sound", 14) == 0)
PrecacheSound (expr_string (params), fexpr->e.symbol->name[14]);
else if (strncmp (fexpr->e.symbol->name, "precache_model", 14) == 0)
PrecacheModel (expr_string (params), fexpr->e.symbol->name[14]);
else if (strncmp (fexpr->e.symbol->name, "precache_file", 13) == 0)
PrecacheFile (expr_string (params), fexpr->e.symbol->name[13]);
}
return build_function_call (fexpr, ftype, params);
}
expr_t *
branch_expr (int op, expr_t *test, expr_t *label)
{
if (label && label->type != ex_label)
internal_error (label, "not a label");
if (label)
label->e.label.used++;
return new_binary_expr (op, test, label);
}
expr_t *
goto_expr (expr_t *label)
{
if (label && label->type != ex_label)
internal_error (label, "not a label");
if (label)
label->e.label.used++;
return new_unary_expr ('g', label);
}
expr_t *
return_expr (function_t *f, expr_t *e)
{
type_t *t;
if (!e) {
if (f->sym->type->t.func.type != &type_void) {
if (options.traditional) {
if (options.warnings.traditional)
warning (e,
"return from non-void function without a value");
e = new_nil_expr ();
} else {
e = error (e, "return from non-void function without a value");
return e;
}
}
return new_unary_expr ('r', 0);
}
t = get_type (e);
if (e->type == ex_error)
return e;
if (f->sym->type->t.func.type == &type_void) {
if (!options.traditional)
return error (e, "returning a value for a void function");
if (options.warnings.traditional)
warning (e, "returning a value for a void function");
}
if (e->type == ex_bool)
e = convert_from_bool (e, f->sym->type->t.func.type);
if (f->sym->type->t.func.type == &type_float && is_integer_val (e)) {
convert_int (e);
t = &type_float;
}
if (t == &type_void) {
if (e->type == ex_nil) {
t = f->sym->type->t.func.type;
convert_nil (e, t);
if (e->type == ex_nil)
return error (e, "invalid return type for NIL");
} else {
if (!options.traditional)
return error (e, "void value not ignored as it ought to be");
if (options.warnings.traditional)
warning (e, "void value not ignored as it ought to be");
//FIXME does anything need to be done here?
}
}
if (!type_assignable (f->sym->type->t.func.type, t)) {
if (!options.traditional)
return error (e, "type mismatch for return value of %s",
f->sym->name);
if (options.warnings.traditional)
warning (e, "type mismatch for return value of %s",
f->sym->name);
} else {
if (f->sym->type->t.func.type != t)
e = cast_expr (f->sym->type->t.func.type, e);
}
return new_unary_expr ('r', e);
}
expr_t *
conditional_expr (expr_t *cond, expr_t *e1, expr_t *e2)
{
expr_t *block = new_block_expr ();
type_t *type1 = get_type (e1);
type_t *type2 = get_type (e2);
expr_t *tlabel = new_label_expr ();
expr_t *flabel = new_label_expr ();
expr_t *elabel = new_label_expr ();
if (cond->type == ex_error)
return cond;
if (e1->type == ex_error)
return e1;
if (e2->type == ex_error)
return e2;
cond = convert_bool (cond, 1);
if (cond->type == ex_error)
return cond;
backpatch (cond->e.bool.true_list, tlabel);
backpatch (cond->e.bool.false_list, flabel);
block->e.block.result = (type1 == type2) ? new_temp_def_expr (type1) : 0;
append_expr (block, cond);
append_expr (cond->e.bool.e, flabel);
if (block->e.block.result)
append_expr (block, assign_expr (block->e.block.result, e2));
else
append_expr (block, e2);
append_expr (block, goto_expr (elabel));
append_expr (block, tlabel);
if (block->e.block.result)
append_expr (block, assign_expr (block->e.block.result, e1));
else
append_expr (block, e1);
append_expr (block, elabel);
return block;
}
expr_t *
incop_expr (int op, expr_t *e, int postop)
{
expr_t *one;
if (e->type == ex_error)
return e;
one = new_integer_expr (1); // integer constants get auto-cast to float
if (postop) {
expr_t *t1, *t2;
type_t *type = get_type (e);
expr_t *block = new_block_expr ();
expr_t *res = new_expr ();
t1 = new_temp_def_expr (type);
t2 = new_temp_def_expr (type);
append_expr (block, assign_expr (t1, e));
append_expr (block, assign_expr (t2, binary_expr (op, t1, one)));
res = copy_expr (e);
if (res->type == ex_uexpr && res->e.expr.op == '.')
res = pointer_expr (address_expr (res, 0, 0));
append_expr (block, assign_expr (res, t2));
block->e.block.result = t1;
return block;
} else {
return asx_expr (op, e, one);
}
}
expr_t *
array_expr (expr_t *array, expr_t *index)
{
type_t *array_type = get_type (array);
type_t *index_type = get_type (index);
expr_t *scale;
expr_t *e;
int ind = 0;
if (array->type == ex_error)
return array;
if (index->type == ex_error)
return index;
if (array_type->type != ev_pointer && !is_array (array_type))
return error (array, "not an array");
if (index_type != &type_integer)
return error (index, "invalid array index type");
if (is_short_val (index))
ind = expr_short (index);
if (is_integer_val (index))
ind = expr_integer (index);
if (array_type->t.func.num_params
&& is_constant (index)
&& (ind < array_type->t.array.base
|| ind - array_type->t.array.base >= array_type->t.array.size))
return error (index, "array index out of bounds");
scale = new_integer_expr (type_size (array_type->t.array.type));
index = binary_expr ('*', index, scale);
index = binary_expr ('-', index,
binary_expr ('*',
new_integer_expr (array_type->t.array.base),
scale));
index = fold_constants (index);
if (is_short_val (index))
ind = expr_short (index);
if (is_integer_val (index))
ind = expr_integer (index);
if ((is_constant (index) && ind < 32768 && ind >= -32768))
index = new_short_expr (ind);
if (is_array (array_type)) {
e = address_expr (array, index, array_type->t.array.type);
} else {
if (!is_short_val (index) || expr_short (index)) {
e = new_binary_expr ('&', array, index);
//e->e.expr.type = array_type->aux_type;
e->e.expr.type = array_type;
} else {
e = array;
}
}
e = unary_expr ('.', e);
return e;
}
expr_t *
pointer_expr (expr_t *pointer)
{
type_t *pointer_type = get_type (pointer);
if (pointer->type == ex_error)
return pointer;
if (pointer_type->type != ev_pointer)
return error (pointer, "not a pointer");
return array_expr (pointer, new_integer_expr (0));
}
expr_t *
address_expr (expr_t *e1, expr_t *e2, type_t *t)
{
expr_t *e;
if (e1->type == ex_error)
return e1;
if (!t)
t = get_type (e1);
switch (e1->type) {
case ex_symbol:
if (e1->e.symbol->sy_type == sy_var) {
def_t *def = e1->e.symbol->s.def;
type_t *type = def->type;
if (is_struct (type) || is_class (type)) {
e = new_pointer_expr (0, t, def);
e->line = e1->line;
e->file = e1->file;
} else if (is_array (type)) {
e = e1;
e->type = ex_value;
e->e.value.type = ev_pointer;
e->e.value.v.pointer.val = 0;
e->e.value.v.pointer.type = t;
e->e.value.v.pointer.def = def;
} else {
e = new_unary_expr ('&', e1);
e->e.expr.type = pointer_type (t);
}
break;
}
return error (e1, "invalid type for unary &");
case ex_expr:
if (e1->e.expr.op == '.') {
e = e1;
e->e.expr.op = '&';
e->e.expr.type = pointer_type (e->e.expr.type);
break;
}
return error (e1, "invalid type for unary &");
case ex_uexpr:
if (e1->e.expr.op == '.') {
e = e1->e.expr.e1;
if (e->type == ex_expr && e->e.expr.op == '.') {
e->e.expr.type = pointer_type (e->e.expr.type);
e->e.expr.op = '&';
}
break;
}
return error (e1, "invalid type for unary &");
default:
return error (e1, "invalid type for unary &");
}
if (e2) {
if (e2->type == ex_error)
return e2;
if (e->type == ex_value && e->e.value.type == ev_pointer
&& is_short_val (e2)) {
e->e.value.v.pointer.val += expr_short (e2);
e->e.value.v.pointer.type = t;
} else {
if (!is_short_val (e2) || expr_short (e2)) {
if (e->type == ex_expr && e->e.expr.op == '&') {
e = new_binary_expr ('&', e->e.expr.e1,
binary_expr ('+', e->e.expr.e2, e2));
} else {
e = new_binary_expr ('&', e, e2);
}
}
if (e->type == ex_expr || e->type == ex_uexpr)
e->e.expr.type = pointer_type (t);
}
}
return e;
}
expr_t *
build_if_statement (expr_t *test, expr_t *s1, expr_t *s2)
{
int line = pr.source_line;
string_t file = pr.source_file;
expr_t *if_expr;
expr_t *tl = new_label_expr ();
expr_t *fl = new_label_expr ();
pr.source_line = test->line;
pr.source_file = test->file;
if_expr = new_block_expr ();
test = convert_bool (test, 1);
if (test->type != ex_error) {
backpatch (test->e.bool.true_list, tl);
backpatch (test->e.bool.false_list, fl);
append_expr (test->e.bool.e, tl);
append_expr (if_expr, test);
}
append_expr (if_expr, s1);
if (s2) {
expr_t *nl = new_label_expr ();
append_expr (if_expr, goto_expr (nl));
append_expr (if_expr, fl);
append_expr (if_expr, s2);
append_expr (if_expr, nl);
} else {
append_expr (if_expr, fl);
}
pr.source_line = line;
pr.source_file = file;
return if_expr;
}
expr_t *
build_while_statement (expr_t *test, expr_t *statement,
expr_t *break_label, expr_t *continue_label)
{
int line = pr.source_line;
string_t file = pr.source_file;
expr_t *l1 = new_label_expr ();
expr_t *l2 = break_label;
expr_t *while_expr;
pr.source_line = test->line;
pr.source_file = test->file;
while_expr = new_block_expr ();
append_expr (while_expr, goto_expr (continue_label));
append_expr (while_expr, l1);
append_expr (while_expr, statement);
append_expr (while_expr, continue_label);
test = convert_bool (test, 1);
if (test->type != ex_error) {
backpatch (test->e.bool.true_list, l1);
backpatch (test->e.bool.false_list, l2);
append_expr (test->e.bool.e, l2);
append_expr (while_expr, test);
}
pr.source_line = line;
pr.source_file = file;
return while_expr;
}
expr_t *
build_do_while_statement (expr_t *statement, expr_t *test,
expr_t *break_label, expr_t *continue_label)
{
expr_t *l1 = new_label_expr ();
int line = pr.source_line;
string_t file = pr.source_file;
expr_t *do_while_expr;
pr.source_line = test->line;
pr.source_file = test->file;
do_while_expr = new_block_expr ();
append_expr (do_while_expr, l1);
append_expr (do_while_expr, statement);
append_expr (do_while_expr, continue_label);
test = convert_bool (test, 1);
if (test->type != ex_error) {
backpatch (test->e.bool.true_list, l1);
backpatch (test->e.bool.false_list, break_label);
append_expr (test->e.bool.e, break_label);
append_expr (do_while_expr, test);
}
pr.source_line = line;
pr.source_file = file;
return do_while_expr;
}
expr_t *
build_for_statement (expr_t *init, expr_t *test, expr_t *next,
expr_t *statement,
expr_t *break_label, expr_t *continue_label)
{
expr_t *tl = new_label_expr ();
expr_t *fl = break_label;
expr_t *l1 = 0;
expr_t *t;
int line = pr.source_line;
string_t file = pr.source_file;
expr_t *for_expr;
if (next)
t = next;
else if (test)
t = test;
else if (init)
t = init;
else
t = continue_label;
pr.source_line = t->line;
pr.source_file = t->file;
for_expr = new_block_expr ();
append_expr (for_expr, init);
if (test) {
l1 = new_label_expr ();
append_expr (for_expr, goto_expr (l1));
}
append_expr (for_expr, tl);
append_expr (for_expr, statement);
append_expr (for_expr, continue_label);
append_expr (for_expr, next);
if (test) {
append_expr (for_expr, l1);
test = convert_bool (test, 1);
if (test->type != ex_error) {
backpatch (test->e.bool.true_list, tl);
backpatch (test->e.bool.false_list, fl);
append_expr (test->e.bool.e, fl);
append_expr (for_expr, test);
}
} else {
append_expr (for_expr, goto_expr (tl));
append_expr (for_expr, fl);
}
pr.source_line = line;
pr.source_file = file;
return for_expr;
}
expr_t *
build_state_expr (expr_t *frame, expr_t *think, expr_t *step)
{
if (is_integer_val (frame))
convert_int (frame);
if (!type_assignable (&type_float, get_type (frame)))
return error (frame, "invalid type for frame number");
if (extract_type (think) != ev_func)
return error (think, "invalid type for think");
if (step) {
if (is_integer_val (step))
convert_int (step);
if (!type_assignable (&type_float, get_type (step)))
return error (step, "invalid type for frame number");
}
return new_state_expr (frame, think, step);
}
static int
is_indirect (expr_t *e)
{
if (e->type == ex_block && e->e.block.result)
return is_indirect (e->e.block.result);
if (e->type == ex_expr && e->e.expr.op == '.')
return 1;
if (!(e->type == ex_uexpr && e->e.expr.op == '.'))
return 0;
e = e->e.expr.e1;
if (e->type != ex_value || e->e.value.type != ev_pointer
|| !(POINTER_VAL (e->e.value.v.pointer) >= 0
&& POINTER_VAL (e->e.value.v.pointer) < 65536)) {
return 1;
}
return 0;
}
static inline int
is_lvalue (expr_t *e)
{
if (e->type == ex_symbol) {
switch (e->e.symbol->sy_type) {
case sy_var:
return 1;
case sy_const:
return 0;
case sy_type:
return 0;
case sy_expr:
return 0;
case sy_func:
return 0;
case sy_class:
return 0;
}
}
if (e->type == ex_temp)
return 1;
if (e->type == ex_expr && e->e.expr.op == '.')
return 1;
if (e->type == ex_uexpr && e->e.expr.op == '.')
return 1;
if (e->type == ex_uexpr && e->e.expr.op == 'A')
return is_lvalue (e->e.expr.e1);
return 0;
}
expr_t *
assign_expr (expr_t *e1, expr_t *e2)
{
int op = '=';
type_t *t1, *t2, *type;
expr_t *e;
convert_name (e1);
convert_name (e2);
if (e1->type == ex_error)
return e1;
if (e2->type == ex_error)
return e2;
if (options.traditional) {
if (e2->type == ex_expr && !e2->paren
&& (e2->e.expr.op == AND || e2->e.expr.op == OR)) {
notice (e2, "precedence of `%s' and `%s' inverted for "
"traditional code", get_op_string (op),
get_op_string (e2->e.expr.op));
e1 = assign_expr (e1, e2->e.expr.e1);
e1->paren = 1;
return binary_expr (e2->e.expr.op, e1, e2->e.expr.e2);
}
}
if (!is_lvalue (e1)) {
if (options.traditional)
warning (e1, "invalid lvalue in assignment");
else
return error (e1, "invalid lvalue in assignment");
}
t1 = get_type (e1);
t2 = get_type (e2);
if (!t1 || !t2) {
internal_error (e1, 0);
}
//XXX func = func ???
if (t1->type == ev_pointer && is_array (t2)) {
e2 = address_expr (e2, 0, t2->t.fldptr.type);
t2 = get_type (e2);
}
if (e2->type == ex_bool)
e2 = convert_from_bool (e2, t1);
if (t1->type != ev_void && e2->type == ex_nil) {
t2 = t1;
convert_nil (e2, t2);
}
e2->rvalue = 1;
if (!type_assignable (t1, t2)) {
if (options.traditional) {
if (t1->type == ev_func && t2->type == ev_func) {
warning (e1, "assignment between disparate function types");
} else if (t1->type == ev_float && t2->type == ev_vector) {
warning (e1, "assignment of vector to float");
e2 = binary_expr ('.', e2, new_name_expr ("x"));
} else if (t1->type == ev_vector && t2->type == ev_float) {
warning (e1, "assignment of float to vector");
e1 = binary_expr ('.', e1, new_name_expr ("x"));
} else {
return type_mismatch (e1, e2, op);
}
} else {
return type_mismatch (e1, e2, op);
}
}
type = t1;
if (is_indirect (e1) && is_indirect (e2)) {
if (is_struct (get_type (e2))) {
e1 = address_expr (e1, 0, 0);
e2 = address_expr (e2, 0, 0);
e = new_move_expr (e1, e2, get_type (e2));
} else {
expr_t *temp = new_temp_def_expr (t1);
e = new_block_expr ();
append_expr (e, assign_expr (temp, e2));
append_expr (e, assign_expr (e1, temp));
e->e.block.result = temp;
}
return e;
} else if (is_indirect (e1)) {
if (is_struct (get_type (e1))) {
e1 = address_expr (e1, 0, 0);
return new_move_expr (e1, e2, get_type (e2));
}
if (e1->type == ex_expr) {
if (get_type (e1->e.expr.e1) == &type_entity) {
type = e1->e.expr.type;
e1->e.expr.type = pointer_type (type);
e1->e.expr.op = '&';
}
op = PAS;
} else {
e = e1->e.expr.e1;
if ((e->type != ex_value || e->e.value.type != ev_pointer)
|| !(POINTER_VAL (e->e.value.v.pointer) > 0
&& POINTER_VAL (e->e.value.v.pointer) < 65536)) {
e1 = e;
op = PAS;
}
}
} else if (is_indirect (e2)) {
if (is_struct (get_type (e1))) {
e2 = address_expr (e2, 0, 0);
e2->rvalue = 1;
return new_move_expr (e1, e2, get_type (e2));
}
if (e2->type == ex_uexpr) {
e = e2->e.expr.e1;
if ((e->type != ex_value || e->e.value.type != ev_pointer)
|| !(POINTER_VAL (e->e.value.v.pointer) > 0
&& POINTER_VAL (e->e.value.v.pointer) < 65536)) {
if (e->type == ex_expr && e->e.expr.op == '&'
&& e->e.expr.type->type == ev_pointer
&& !is_constant (e)) {
e2 = e;
e2->e.expr.op = '.';
e2->e.expr.type = t2;
e2->rvalue = 1;
}
}
}
}
if (is_struct (get_type (e1))) {
return new_move_expr (e1, e2, get_type (e2));
}
if (!type)
internal_error (e1, 0);
e = new_binary_expr (op, e1, e2);
e->e.expr.type = type;
return e;
}
expr_t *
cast_expr (type_t *type, expr_t *e)
{
expr_t *c;
type_t *e_type;
convert_name (e);
if (e->type == ex_error)
return e;
e_type = get_type (e);
if (type == e_type)
return e;
if ((type == type_default && is_enum (e_type))
|| (is_enum (type) && e_type == type_default))
return e;
if (!(type->type == ev_pointer
&& (e_type->type == ev_pointer
|| e_type == &type_integer //|| e_type == &type_uinteger
|| is_array (e_type)))
&& !(type->type == ev_func && e_type->type == ev_func)
&& !(((type == &type_integer)
&& (e_type == &type_float || e_type == &type_integer
|| e_type->type == ev_pointer))
|| (type == &type_float
&& (e_type == &type_integer)))) {
return cast_error (e, get_type (e), type);
}
if (is_array (e_type)) {
return address_expr (e, 0, 0);
}
if (e->type == ex_uexpr && e->e.expr.op == '.') {
e->e.expr.type = type;
c = e;
} else {
c = new_unary_expr ('C', e);
c->e.expr.type = type;
}
return c;
}
expr_t *
selector_expr (keywordarg_t *selector)
{
dstring_t *sel_id = dstring_newstr ();
expr_t *sel;
symbol_t *sel_sym;
symbol_t *sel_table;
int index;
selector = copy_keywordargs (selector);
selector = (keywordarg_t *) reverse_params ((param_t *) selector);
selector_name (sel_id, selector);
index = selector_index (sel_id->str);
index *= type_size (type_SEL.t.fldptr.type);
sel_sym = make_symbol ("_OBJ_SELECTOR_TABLE_PTR", &type_SEL,
pr.near_data, st_static);
if (!sel_sym->table) {
symtab_addsymbol (pr.symtab, sel_sym);
sel_table = make_symbol ("_OBJ_SELECTOR_TABLE",
array_type (type_SEL.t.fldptr.type, 0),
pr.far_data, st_extern);
if (!sel_table->table)
symtab_addsymbol (pr.symtab, sel_table);
reloc_def_def (sel_table->s.def, sel_sym->s.def);
}
sel = new_symbol_expr (sel_sym);
dstring_delete (sel_id);
sel = new_binary_expr ('&', sel, new_short_expr (index));
sel->e.expr.type = &type_SEL;
return sel;
}
expr_t *
protocol_expr (const char *protocol)
{
return error (0, "not implemented");
}
expr_t *
encode_expr (type_t *type)
{
dstring_t *encoding = dstring_newstr ();
expr_t *e;
encode_type (encoding, type);
e = new_string_expr (encoding->str);
free (encoding);
return e;
}
expr_t *
super_expr (class_type_t *class_type)
{
symbol_t *sym;
expr_t *super;
expr_t *e;
expr_t *super_block;
class_t *class;
if (!class_type)
return error (0, "`super' used outside of class implementation");
class = extract_class (class_type);
if (!class->super_class)
return error (0, "%s has no super class", class->name);
sym = symtab_lookup (current_symtab, ".super");
if (!sym || sym->table != current_symtab) {
sym = new_symbol (".super");
initialize_def (sym, &type_Super, 0, current_symtab->space, st_local);
}
super = new_symbol_expr (sym);
super_block = new_block_expr ();
e = assign_expr (binary_expr ('.', super, new_name_expr ("self")),
new_name_expr ("self"));
append_expr (super_block, e);
e = new_symbol_expr (class_pointer_symbol (class));
e = assign_expr (binary_expr ('.', super, new_name_expr ("class")),
binary_expr ('.', e, new_name_expr ("super_class")));
append_expr (super_block, e);
e = address_expr (super, 0, 0);
super_block->e.block.result = e;
return super_block;
}
expr_t *
message_expr (expr_t *receiver, keywordarg_t *message)
{
expr_t *args = 0, **a = &args;
expr_t *selector = selector_expr (message);
expr_t *call;
keywordarg_t *m;
int self = 0, super = 0, class_msg = 0;
type_t *rec_type;
type_t *return_type;
type_t *method_type = &type_IMP;
class_t *class = 0;
method_t *method;
expr_t *send_msg;
if (receiver->type == ex_symbol
&& strcmp (receiver->e.symbol->name, "super") == 0) {
super = 1;
receiver = super_expr (current_class);
if (receiver->type == ex_error)
return receiver;
receiver = cast_expr (&type_id, receiver); //FIXME better way?
class = extract_class (current_class);
rec_type = class->type;
} else {
if (receiver->type == ex_symbol) {
if (strcmp (receiver->e.symbol->name, "self") == 0)
self = 1;
if (receiver->e.symbol->sy_type == sy_class) {
class = receiver->e.symbol->type->t.class;
class_msg = 1;
receiver = new_symbol_expr (class_pointer_symbol (class));
}
}
rec_type = get_type (receiver);
if (receiver->type == ex_error)
return receiver;
if (rec_type->type == ev_pointer)
rec_type = rec_type->t.fldptr.type;
if (!is_class (rec_type))
return error (receiver, "not a class/object");
if (self) {
if (!class)
class = extract_class (current_class);
if (rec_type == class_Class.type)
class_msg = 1;
} else {
if (!class)
class = rec_type->t.class;
}
}
return_type = &type_id;
method = class_message_response (class, class_msg, selector);
if (method)
return_type = method->type->t.func.type;
for (m = message; m; m = m->next) {
*a = m->expr;
while ((*a))
a = &(*a)->next;
}
*a = selector;
a = &(*a)->next;
*a = receiver;
send_msg = send_message (super);
if (method) {
expr_t *err;
if ((err = method_check_params (method, args)))
return err;
method_type = method->type;
}
call = build_function_call (send_msg, method_type, args);
if (call->type == ex_error)
return receiver;
call->e.block.result = new_ret_expr (return_type);
return call;
}
expr_t *
sizeof_expr (expr_t *expr, struct type_s *type)
{
if (!((!expr) ^ (!type))) {
internal_error (0, 0);
}
if (!type)
type = get_type (expr);
expr = new_integer_expr (type_size (type));
return expr;
}
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