fixed async generator in case of exception in the implicit await in the 'return' statement

Author: Fabrice Bellard

quickjs.c

@@ -19182,7 +19182,7 @@ static int js_async_generator_completed_return(JSContext *ctx,
     // exception should be delivered to the catch handler.
     if (JS_IsException(promise)) {
         JSValue err = JS_GetException(ctx);
-        promise = js_promise_resolve(ctx, ctx->promise_ctor, 1, &err,
+        promise = js_promise_resolve(ctx, ctx->promise_ctor, 1, (JSValueConst *)&err,
                                      /*is_reject*/1);
         JS_FreeValue(ctx, err);
         if (JS_IsException(promise))
@@ -19235,7 +19235,6 @@ static void js_async_generator_resume_next(JSContext *ctx,
             } else if (next->completion_type == GEN_MAGIC_RETURN) {
                 s->state = JS_ASYNC_GENERATOR_STATE_AWAITING_RETURN;
                 js_async_generator_completed_return(ctx, s, next->result);
-                goto done;
             } else {
                 js_async_generator_reject(ctx, s, next->result);
             }
@@ -19266,7 +19265,7 @@ static void js_async_generator_resume_next(JSContext *ctx,
                 js_async_generator_reject(ctx, s, value);
                 JS_FreeValue(ctx, value);
             } else if (JS_VALUE_GET_TAG(func_ret) == JS_TAG_INT) {
-                int func_ret_code;
+                int func_ret_code, ret;
                 value = s->func_state.frame.cur_sp[-1];
                 s->func_state.frame.cur_sp[-1] = JS_UNDEFINED;
                 func_ret_code = JS_VALUE_GET_INT(func_ret);
@@ -19281,8 +19280,13 @@ static void js_async_generator_resume_next(JSContext *ctx,
                     JS_FreeValue(ctx, value);
                     break;
                 case FUNC_RET_AWAIT:
-                    js_async_generator_await(ctx, s, value);
+                    ret = js_async_generator_await(ctx, s, value);
                     JS_FreeValue(ctx, value);
+                    if (ret < 0) {
+                        /* exception: throw it */
+                        s->func_state.throw_flag = TRUE;
+                        goto resume_exec;
+                    }
                     goto done;
                 default:
                     abort();
@@ -25436,6 +25440,18 @@ static void emit_return(JSParseState *s, BOOL hasval)
     BlockEnv *top;
     int drop_count;
 
+    if (s->cur_func->func_kind != JS_FUNC_NORMAL) {
+        if (!hasval) {
+            /* no value: direct return in case of async generator */
+            emit_op(s, OP_undefined);
+            hasval = TRUE;
+        } else if (s->cur_func->func_kind == JS_FUNC_ASYNC_GENERATOR) {
+            /* the await must be done before handling the "finally" in
+               case it raises an exception */
+            emit_op(s, OP_await);
+        }
+    }
+    
     drop_count = 0;
     top = s->cur_func->top_break;
     while (top != NULL) {
@@ -25514,11 +25530,6 @@ static void emit_return(JSParseState *s, BOOL hasval)
         emit_label(s, label_return);
         emit_op(s, OP_return);
     } else if (s->cur_func->func_kind != JS_FUNC_NORMAL) {
-        if (!hasval) {
-            emit_op(s, OP_undefined);
-        } else if (s->cur_func->func_kind == JS_FUNC_ASYNC_GENERATOR) {
-            emit_op(s, OP_await);
-        }
         emit_op(s, OP_return_async);
     } else {
         emit_op(s, hasval ? OP_return : OP_return_undef);

test262_errors.txt

@@ -1,6 +1,4 @@
 test262/test/annexB/language/eval-code/direct/script-decl-lex-collision-in-sloppy-mode.js:13: Test262Error: Expected a SyntaxError to be thrown but no exception was thrown at all
-test262/test/built-ins/AsyncGeneratorPrototype/return/return-suspendedYield-broken-promise-try-catch.js:39: TypeError: $DONE() not called
-test262/test/built-ins/AsyncGeneratorPrototype/return/return-suspendedYield-broken-promise-try-catch.js:39: strict mode: TypeError: $DONE() not called
 test262/test/built-ins/Function/internals/Construct/derived-this-uninitialized-realm.js:20: Test262Error: Expected a ReferenceError but got a different error constructor with the same name
 test262/test/built-ins/Function/internals/Construct/derived-this-uninitialized-realm.js:20: strict mode: Test262Error: Expected a ReferenceError but got a different error constructor with the same name
 test262/test/built-ins/RegExp/lookahead-quantifier-match-groups.js:27: Test262Error: Expected [a, abc] and [a, undefined] to have the same contents. ? quantifier