gas: Compile variable expression with scope support

This patch adds the variable compilation and uses a scope (a stack of
map) to lookup for identities.

Today we use a vector + ref_entry structs in order to achieve the scope
implementation. The ref_entry lacks memory management, we are still no
sure who will be the owner of the pointer.

We also want to replace the scope a hashtable_t type as soon as we get
one.

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

1 files changed, 2 insertions, 5 deletions

diff --git a/src/ast.c b/src/ast.c
index 1131bbf..55b65fa 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -54,17 +54,14 @@ ast_node_destroy(ast_node_t *node)
     case AST_VARIABLE_DECLARATION:
       ast_node_destroy(node->data.variable_declaration.value);
       break;
-    case AST_LITERAL:
-      break;
     case AST_RETURN_STMT:
       ast_node_destroy(node->data.return_stmt.argument);
       break;
+    case AST_LITERAL:
     case AST_IDENTIFIER:
-      break;
     case AST_UNKOWN_NODE:
+    case AST_VARIABLE:
       break;
-    default:
-      assert(false && "unmapped free strategy");
   }
   free(node);
 }