quakeforge/tools/qfcc/source/emit.c

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/*
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emit.c
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statement emittion
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Copyright (C) 2001 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
Date: 2001/07/26
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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
*/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] = "$Id$";
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#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include <QF/mathlib.h>
#include <QF/va.h>
#include "codespace.h"
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#include "def.h"
#include "defspace.h"
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#include "debug.h"
#include "diagnostic.h"
#include "emit.h"
#include "function.h"
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#include "opcodes.h"
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#include "options.h"
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#include "qfcc.h"
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#include "reloc.h"
#include "statements.h"
#include "symtab.h"
#include "type.h"
#include "value.h"
static def_t zero_def;
static def_t *
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get_value_def (ex_value_t *value, etype_t type)
{
def_t *def;
if (type == ev_short) {
def = new_def (0, &type_short, 0, st_extern);
def->offset = value->v.short_val;
return def;
}
def = emit_value (value, 0);
if (type != def->type->type)
return alias_def (def, ev_types[type]);
return def;
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}
static def_t *
get_operand_def (expr_t *expr, operand_t *op)
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{
def_t *def;
if (!op)
return 0;
switch (op->op_type) {
case op_symbol:
switch (op->o.symbol->sy_type) {
case sy_var:
if (op->type != op->o.symbol->type->type)
return alias_def (op->o.symbol->s.def,
ev_types[op->type]);
return op->o.symbol->s.def;
case sy_func:
return op->o.symbol->s.func->def;
case sy_const:
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return get_value_def (&op->o.symbol->s.value, op->type);
case sy_type:
case sy_expr:
case sy_class:
internal_error (expr, "invalid operand type");
}
break;
case op_value:
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return get_value_def (op->o.value, op->type);
case op_label:
zero_def.type = &type_short;
return &zero_def; //FIXME
case op_temp:
if (!op->o.def)
op->o.def = temp_def (op->type, op->size);
return op->o.def;
case op_pointer:
def = op->o.pointer->def;
if (op->o.pointer->val || op->type != def->type->type) {
def = alias_def (def, ev_types[op->type]);
def->offset = op->o.pointer->val;
def->offset_reloc = 1;
}
return def;
case op_alias:
def = alias_def (get_operand_def (expr, op->o.alias),
ev_types[op->type]);
return def;
}
return 0;
}
static void
add_statement_def_ref (def_t *def, dstatement_t *st, int field)
{
if (def) {
int st_ofs = st - pr.code->code;
int offset_reloc = 0;
while (def->alias) {
//FIXME it seems there is a bug somewhere creating chains
//of aliases
def_t *a = def;
offset_reloc |= def->offset_reloc;
def = def->alias;
free_def (a);
}
if (offset_reloc)
reloc_op_def_ofs (def, st_ofs, field);
else
reloc_op_def (def, st_ofs, field);
}
}
static void
add_statement_op_ref (operand_t *op, dstatement_t *st, int field)
{
if (op && op->op_type == op_label) {
int st_ofs = st - pr.code->code;
reloc_t *reloc = new_reloc (0, st_ofs, rel_op_a_op + field);
reloc->next = op->o.label->dest->relocs;
op->o.label->dest->relocs = reloc;
}
}
static void
emit_statement (statement_t *statement)
{
const char *opcode = statement->opcode;
def_t *def_a = get_operand_def (statement->expr, statement->opa);
def_t *def_b = get_operand_def (statement->expr, statement->opb);
def_t *def_c = get_operand_def (statement->expr, statement->opc);
opcode_t *op = opcode_find (opcode, def_a, def_b, def_c);
dstatement_t *s;
if (!op) {
print_expr (statement->expr);
print_statement (statement);
internal_error (statement->expr, "ice ice baby");
}
if (options.code.debug) {
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expr_t *e = statement->expr;
pr_uint_t line = (e ? e->line : pr.source_line) - lineno_base;
if (line != pr.linenos[pr.num_linenos - 1].line) {
pr_lineno_t *lineno = new_lineno ();
lineno->line = line;
lineno->fa.addr = pr.code->size;
}
}
s = codespace_newstatement (pr.code);
s->op = op->opcode;
s->a = def_a ? def_a->offset : 0;
s->b = def_b ? def_b->offset : 0;
s->c = def_c ? def_c->offset : 0;
add_statement_def_ref (def_a, s, 0);
add_statement_def_ref (def_b, s, 1);
add_statement_def_ref (def_c, s, 2);
add_statement_op_ref (statement->opa, s, 0);
add_statement_op_ref (statement->opb, s, 1);
add_statement_op_ref (statement->opc, s, 2);
}
void
emit_statements (sblock_t *first_sblock)
{
sblock_t *sblock;
statement_t *s;
for (sblock = first_sblock; sblock; sblock = sblock->next) {
sblock->offset = pr.code->size;
for (s = sblock->statements; s; s = s->next)
emit_statement (s);
}
for (sblock = first_sblock; sblock; sblock = sblock->next)
relocate_refs (sblock->relocs, sblock->offset);
}