gas: Generate function call

This is an initial commit that enables function calls. At this point
only functions with no parameters is going to work.

Signed-off-by: Carlos Maniero <carlos@maniero.me>

1 files changed, 17 insertions, 5 deletions

diff --git a/src/parser.c b/src/parser.c
index b94087f..578514c 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -339,10 +339,9 @@ parser_parse_factor(parser_t *parser)
       return expression;
     }
     case TOKEN_NAME: {
-      // TODO: Check node kind, today accepts only variables
-      ast_node_t *var_node = scope_get(parser->scope, token.value);
+      ast_node_t *referenced_node = scope_get(parser->scope, token.value);
 
-      if (var_node == NULL) {
+      if (referenced_node == NULL) {
         parser_error_t error;
         error.token = token;
         sprintf(error.message, "identifier '" SVFMT "' not defined", SVARG(&token.value));
@@ -350,8 +349,21 @@ parser_parse_factor(parser_t *parser)
         return NULL;
       }
 
-      return ast_node_new_variable(&var_node->data.variable_declaration.identifier,
-                                   var_node->data.variable_declaration.type);
+      if (referenced_node->kind == AST_VARIABLE_DECLARATION) {
+        return ast_node_new_variable(&referenced_node->data.variable_declaration.identifier,
+                                     referenced_node->data.variable_declaration.type);
+      }
+
+      // Parse function parameters
+      if (!drop_expected_token(parser, TOKEN_OPAREN)) {
+        return NULL;
+      }
+      if (!drop_expected_token(parser, TOKEN_CPAREN)) {
+        return NULL;
+      }
+
+      return ast_node_new_function_call(&referenced_node->data.function.identifier,
+                                        referenced_node->data.function.return_type);
     }
     default: {
       parser_error_t error;