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| | /*
* Copyright (C) 2024 olang maintainers
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "checker.h"
#include "scope.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
static void
populate_scope(checker_t *checker, scope_t *scope, ast_node_t *ast);
checker_t *
checker_new(arena_t *arena)
{
assert(arena);
checker_t *checker = (checker_t *)arena_alloc(arena, sizeof(checker_t));
if (checker == NULL) {
fprintf(stderr, "[FATAL] Out of memory: checker_new: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
checker->arena = arena;
return checker;
}
void
checker_check(checker_t *checker, ast_node_t *ast)
{
assert(checker);
assert(ast);
scope_t *scope = scope_new(checker->arena);
populate_scope(checker, scope, ast);
// TODO: traverse the ast tree to verify semantics
}
static void
populate_scope(checker_t *checker, scope_t *scope, ast_node_t *ast)
{
switch (ast->kind) {
case AST_NODE_TRANSLATION_UNIT: {
populate_scope(checker, scope, ast->as_translation_unit.fn);
return;
}
case AST_NODE_FN_DEF: {
ast->as_fn_def.scope = scope;
// FIXME: insert function symbol to scope
populate_scope(checker, scope, ast->as_fn_def.block);
return;
}
case AST_NODE_IF_STMT: {
populate_scope(checker, scope, ast->as_if_stmt.cond);
populate_scope(checker, scope, ast->as_if_stmt.then);
if (ast->as_if_stmt._else) {
populate_scope(checker, scope, ast->as_if_stmt._else);
}
return;
}
case AST_NODE_BINARY_OP: {
ast_binary_op_t bin_op = ast->as_bin_op;
populate_scope(checker, scope, bin_op.lhs);
populate_scope(checker, scope, bin_op.rhs);
return;
}
case AST_NODE_RETURN_STMT: {
ast_return_stmt_t return_stmt = ast->as_return_stmt;
populate_scope(checker, scope, return_stmt.expr);
return;
}
case AST_NODE_BLOCK: {
ast_block_t block = ast->as_block;
scope = scope_push(scope);
list_item_t *item = list_head(block.nodes);
while (item != NULL) {
populate_scope(checker, scope, (ast_node_t *)item->value);
item = list_next(item);
}
return;
}
case AST_NODE_VAR_DEF: {
string_view_t id = ast->as_var_def.id;
symbol_t *symbol = symbol_new(checker->arena, id, type_from_id(ast->as_var_def.type));
scope_insert(scope, symbol);
ast->as_var_def.scope = scope;
return;
}
case AST_NODE_REF: {
ast->as_ref.scope = scope;
return;
}
case AST_NODE_LITERAL:
case AST_NODE_UNKNOWN:
return;
}
}
|