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/* Oort
* Copyright 2007, Soren Sandmann Pedersen
*
* 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 the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "ast.h"
#include <stdlib.h>
/* Mark constant expressions as such */
gboolean
mark_constants (ast_t *ast)
{
ast_expression_t *expr;
gboolean constant;
value_t *result;
GList *list;
for (list = ast->common.children->head; list; list = list->next)
mark_constants (list->data);
if (ast->common.type != AST_EXPRESSION)
return TRUE;
constant = FALSE;
expr = &ast->expression;
result = &expr->common.constant_value;
switch (expr->common.type)
{
case AST_INT_LITERAL_EXPRESSION:
result->int32_val = expr->int_literal.value;
constant = TRUE;
break;
case AST_FLOAT_LITERAL_EXPRESSION:
result->double_val = expr->float_literal.value;
constant = TRUE;
break;
case AST_BOOL_LITERAL_EXPRESSION:
result->bool_val = expr->bool_literal.value;
constant = TRUE;
break;
case AST_STRING_LITERAL_EXPRESSION:
result->pointer_val = expr->string_literal.value;
constant = TRUE;
break;
case AST_NULL_EXPRESSION:
result->pointer_val = NULL;
constant = TRUE;
break;
case AST_IDENTIFIER_EXPRESSION:
/* FIXME: maybe check if it's a constant, particularly
* when we add enums
*/
break;
case AST_LAMBDA_EXPRESSION:
case AST_CALL_EXPRESSION:
case AST_STATEMENT_EXPRESSION:
case AST_NEW_EXPRESSION:
case AST_DOT_EXPRESSION:
case AST_THIS_EXPRESSION:
case AST_VOID_EXPRESSION:
case AST_INDEX_EXPRESSION:
break;
case AST_DEFINITION_EXPRESSION:
/* FIXME: It might actually be useful to allow this */
break;
case AST_BLOCK_EXPRESSION:
if (expr->block.body->common.constant)
{
*result = expr->block.body->common.constant_value;
constant = TRUE;
}
break;
case AST_UNARY_EXPRESSION:
if (expr->unary.expr->common.constant)
{
evaluate_unary_operator (expr->unary.operator,
expr->unary.expr->common.type_spec,
&expr->unary.expr->common.constant_value,
expr->common.type_spec, result);
constant = TRUE;
}
break;
case AST_BINARY_EXPRESSION:
if (expr->binary.left->common.constant &&
expr->binary.right->common.constant)
{
value_t *left = &expr->binary.left->common.constant_value;
value_t *right = &expr->binary.right->common.constant_value;
evaluate_binary_operator (
expr->binary.operator,
expr->binary.left->common.type_spec, left,
expr->binary.right->common.type_spec, right,
expr->common.type_spec, result);
constant = TRUE;
}
break;
case AST_TERNARY_EXPRESSION:
/* FIXME: we could require only the taken branch to be constant */
if (expr->ternary.cond->common.constant &&
expr->ternary.then_expr->common.constant &&
expr->ternary.else_expr->common.constant)
{
if (expr->ternary.cond->common.constant_value.bool_val)
*result = expr->ternary.then_expr->common.constant_value;
else
*result = expr->ternary.else_expr->common.constant_value;
constant = TRUE;
}
break;
}
expr->common.constant = constant;
return TRUE;
}
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