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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"
static void
mark_used (node_t *node, gpointer data)
{
if (node->common.type == NODE_LOAD)
{
node->load.definition->used = TRUE;
}
else if (node->common.type == NODE_STORE)
{
node->store.definition->used = TRUE;
}
else if (node->common.type == NODE_LOAD_IND)
{
node->load_ind.definition->used = TRUE;
}
else if (node->common.type == NODE_STORE_IND)
{
node->store_ind.definition->used = TRUE;
}
}
static void
list_def (gpointer key, gpointer value, gpointer data)
{
GPtrArray *array = data;
g_ptr_array_add (array, value);
}
static int
assign_offsets (symbol_table_t *symbols, int offset, int *max)
{
GPtrArray *definitions = g_ptr_array_new ();
int i;
g_hash_table_foreach (symbols->symbols, list_def, definitions);
for (i = 0; i < definitions->len; ++i)
{
ast_definition_t *definition = definitions->pdata[i];
if (definition->common.type == AST_VARIABLE_DEFINITION)
{
ast_variable_definition_t *variable = &definition->variable;
if (variable->used || variable->parameter)
{
int size = ast_type_spec_get_size (variable->type_spec);
/* Align to size */
if (offset % size != 0)
offset += (size - offset % size);
variable->offset = offset;
offset += size;
}
}
}
g_ptr_array_free (definitions, TRUE);
if (offset > *max)
*max = offset;
return offset;
}
static void
do_offsets (ast_t *ast, int offset, int *max)
{
GList *list;
symbol_table_t *symbols = NULL;
if (ast_is (ast, AST_STATEMENT, AST_BLOCK_STATEMENT))
{
symbols = ast->statement.block.symbol_table;
}
else if (ast_is (ast, AST_EXPRESSION, AST_BLOCK_EXPRESSION))
{
symbols = ast->expression.block.symbol_table;
}
else if (ast_is (ast, AST_DEFINITION, AST_CLASS_DEFINITION))
{
ast_class_definition_t *class = &(ast->definition.class);
symbols = class->symbol_table;
/* FIXME: we should probably fix pointers at 32 bits - see TODO */
offset = sizeof (gpointer); /* The outer pointer */
if (0) /* FIXME: For now we don't support virtual methods */
offset += sizeof (gpointer); /* The vtable pointer */
class->env_size = offset;
max = &(class->env_size);
}
else if (ast_is (ast, AST_DEFINITION, AST_FUNCTION_DEFINITION))
{
ast_function_definition_t *function = &(ast->definition.function);
symbols = ast->definition.function.symbol_table;
/* FIXME: we should probably fix pointers at 32 bits - see TODO */
offset = 4 * sizeof (gpointer); /* The 'outer' pointer,
* the old env,
* the return address
* the return stack
*/
function->env_size = offset;
max = &(function->env_size);
}
else if (ast->common.type == AST_PROGRAM)
{
ast_program_t *program = &(ast->program);
symbols = ast->program.symbol_table;
offset = 0;
program->env_size = offset;
max = &(program->env_size);
}
if (symbols)
offset = assign_offsets (symbols, offset, max);
for (list = ast->common.children->head; list != NULL; list = list->next)
do_offsets (list->data, offset, max);
}
gboolean
offsets (ast_t *ast)
{
program_breadth_first (&ast->program, mark_used, NULL);
do_offsets (ast, 0, NULL);
/* The offsets pass can never fail */
return TRUE;
}
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