parser: Create the literal node type

Since we want to extend our code to support multiple kind of expression
it does not make sense that the return statement always return a number.

For now on, return statement has an ast_node_t as argument, meaning that
it could be anything. The literal_node_t was also implemented in order
to keep the application behavior.

Following the C's calling convention the literal values are stored at
%eax and the return takes this argument to do anything it is needed.

Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/test/parser_test.c b/test/parser_test.c
index d1b8881..573296f 100644
--- a/test/parser_test.c
+++ b/test/parser_test.c
@@ -71,7 +71,11 @@ test_parse_function(const MunitParameter params[],
   ast_node_t *ast_return = ast_function->data.function.body;
 
   assert_int(AST_RETURN_STMT, ==, ast_return->kind);
-  assert_int(42, ==, ast_return->data.return_stmt.number);
+
+  ast_node_t *ast_literal = ast_return->data.return_stmt.argument;
+
+  assert_int(AST_LITERAL, ==, ast_literal->kind);
+  assert_int(42, ==, ast_literal->data.literal.value.integer);
 
   ast_node_destroy(ast_function);
 
@@ -89,7 +93,7 @@ test_parse_basic_syntax_errors(const MunitParameter params[],
   assert_parser_error("main(): { return 42; }"      , "expected 'TOKEN_NAME' but got '{'");
   assert_parser_error("main(): i32 return 42; }"    , "expected '{' but got 'TOKEN_NAME'");
   assert_parser_error("main(): i32 { 42; }"         , "expected 'TOKEN_NAME' but got 'TOKEN_NUMBER'");
-  assert_parser_error("main(): i32 { return; }"     , "expected 'TOKEN_NUMBER' but got ';'");
+  assert_parser_error("main(): i32 { return; }"     , "unexpected '; (;)' token");
   assert_parser_error("main(): i32 { return 42;"    , "expected '}' but got end of file");
   assert_parser_error("main(): beff { return 42; }" , "type 'beff' is not defined");
   assert_parser_error("main(): i32 { oxi 42; }"     , "expected 'return' keyword but got 'oxi'");