feat: defer 延迟执行 — defer { stmts; } 在 return 前按 LIFO 执行

Token(73): +TOK_DEFER, AST(28): +AST_DEFER_STMT, 新增 38_defer.l parser: defer { ... } 块 + defer expr; 表达式两种形式 codegen: defer 栈压入 block, emit_deferred() 在 return 前 LIFO 发射 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-07 13:51:10 +08:00
parent e60021b684
commit 0088347576
10 changed files with 62 additions and 6 deletions
@@ -7,7 +7,7 @@
 typedef enum {
    // 关键字
    TOK_FN, TOK_LET, TOK_VAR, TOK_IF, TOK_ELSE, TOK_WHILE, TOK_FOR, TOK_IN, TOK_RETURN, TOK_GUARD,
-    TOK_STRUCT, TOK_TYPE, TOK_ENUM, TOK_EXTEND, TOK_MATCH, TOK_PUB, TOK_MOD, TOK_USE,
+    TOK_STRUCT, TOK_TYPE, TOK_ENUM, TOK_EXTEND, TOK_DEFER, TOK_MATCH, TOK_PUB, TOK_MOD, TOK_USE,
    TOK_TRAIT, TOK_SELF,
    // 类型关键字
    TOK_I32, TOK_I64, TOK_U64, TOK_F64, TOK_BOOL, TOK_CHAR, TOK_STR, TOK_VOID,