Fix three async function issues. (#3863)

- Invalid assert
- Add missing async prefix check when an identifier is enclosed in brackets
- Adding a new byte-code

Fixes #3855
Fixes #3856
Fixes #3857

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/include/jerryscript-snapshot.h

@@ -30,7 +30,7 @@ extern "C"
 /**
  * Jerry snapshot format version.
  */
-#define JERRY_SNAPSHOT_VERSION (45u)
+#define JERRY_SNAPSHOT_VERSION (46u)
 
 /**
  * Flags for jerry_generate_snapshot and jerry_generate_function_snapshot.

jerry-core/parser/js/byte-code.c

@@ -27,7 +27,7 @@ JERRY_STATIC_ASSERT ((sizeof (cbc_uint16_arguments_t) % sizeof (jmem_cpointer_t)
  */
 JERRY_STATIC_ASSERT (CBC_END == 238,
                      number_of_cbc_opcodes_changed);
-JERRY_STATIC_ASSERT (CBC_EXT_END == 115,
+JERRY_STATIC_ASSERT (CBC_EXT_END == 116,
                      number_of_cbc_ext_opcodes_changed);
 
 #if ENABLED (JERRY_PARSER)

jerry-core/parser/js/byte-code.h

@@ -726,6 +726,8 @@
               VM_OC_EXT_RETURN | VM_OC_GET_STACK) \
   CBC_OPCODE (CBC_EXT_RETURN_PROMISE, CBC_NO_FLAG, -1, \
               VM_OC_RETURN_PROMISE | VM_OC_GET_STACK) \
+  CBC_OPCODE (CBC_EXT_RETURN_PROMISE_UNDEFINED, CBC_NO_FLAG, 0, \
+              VM_OC_RETURN_PROMISE) \
   CBC_OPCODE (CBC_EXT_PUSH_NEW_TARGET, CBC_NO_FLAG, 1, \
               VM_OC_PUSH_NEW_TARGET | VM_OC_PUT_STACK) \
   \

jerry-core/parser/js/js-parser-statm.c

@@ -3017,8 +3017,7 @@ parser_parse_statements (parser_context_t *context_p) /**< context */
 #if ENABLED (JERRY_ES2015)
           if (context_p->status_flags & PARSER_IS_ASYNC_FUNCTION)
           {
-            parser_emit_cbc (context_p, CBC_PUSH_UNDEFINED);
-            parser_emit_cbc_ext (context_p, CBC_EXT_RETURN_PROMISE);
+            parser_emit_cbc_ext (context_p, CBC_EXT_RETURN_PROMISE_UNDEFINED);
             break;
           }
 #endif /* ENABLED (JERRY_ES2015) */

jerry-core/parser/js/js-parser.c

@@ -1018,7 +1018,8 @@ parser_post_processing (parser_context_t *context_p) /**< context */
       length++;
 
 #if ENABLED (JERRY_ES2015)
-      if (ext_opcode == CBC_EXT_RETURN_PROMISE)
+      if (ext_opcode == CBC_EXT_RETURN_PROMISE
+          || ext_opcode == CBC_EXT_RETURN_PROMISE_UNDEFINED)
       {
         last_opcode = CBC_RETURN;
       }
@@ -1163,7 +1164,7 @@ parser_post_processing (parser_context_t *context_p) /**< context */
 #if ENABLED (JERRY_ES2015)
     if (context_p->status_flags & PARSER_IS_ASYNC_FUNCTION)
     {
-      length += 2;
+      length++;
     }
 #endif /* ENABLED (JERRY_ES2015) */
 
@@ -1540,10 +1541,9 @@ parser_post_processing (parser_context_t *context_p) /**< context */
 #if ENABLED (JERRY_ES2015)
     if (context_p->status_flags & PARSER_IS_ASYNC_FUNCTION)
     {
-      dst_p[-1] = CBC_PUSH_UNDEFINED;
-      dst_p[0] = CBC_EXT_OPCODE;
-      dst_p[1] = CBC_EXT_RETURN_PROMISE;
-      dst_p += 2;
+      dst_p[-1] = CBC_EXT_OPCODE;
+      dst_p[0] = CBC_EXT_RETURN_PROMISE_UNDEFINED;
+      dst_p++;
     }
 #endif /* ENABLED (JERRY_ES2015) */
   }

jerry-core/parser/js/js-scanner-ops.c

@@ -260,7 +260,8 @@ scanner_check_async_function (parser_context_t *context_p, /**< context */
                               scanner_context_t *scanner_context_p) /**< scanner context */
 {
   JERRY_ASSERT (lexer_token_is_async (context_p));
-  JERRY_ASSERT (scanner_context_p->mode == SCAN_MODE_PRIMARY_EXPRESSION);
+  JERRY_ASSERT (scanner_context_p->mode == SCAN_MODE_PRIMARY_EXPRESSION
+                || scanner_context_p->mode == SCAN_MODE_PRIMARY_EXPRESSION_AFTER_NEW);
   JERRY_ASSERT (scanner_context_p->async_source_p != NULL);
 
   lexer_lit_location_t async_literal = context_p->token.lit_location;
@@ -430,10 +431,18 @@ scanner_scan_bracket (parser_context_t *context_p, /**< context */
           async_source_p = source_p;
         }
       }
-      else if (depth == total_depth - 1 && lexer_check_arrow (context_p))
+      else if (depth == total_depth - 1)
       {
-        arrow_type = SCANNER_SCAN_BRACKET_ARROW_WITH_ONE_ARG;
-        break;
+        if (lexer_check_arrow (context_p))
+        {
+          arrow_type = SCANNER_SCAN_BRACKET_ARROW_WITH_ONE_ARG;
+          break;
+        }
+
+        if (context_p->stack_top_uint8 == SCAN_STACK_USE_ASYNC)
+        {
+          scanner_add_async_literal (context_p, scanner_context_p);
+        }
       }
 
       arrow_source_p = NULL;

tests/jerry/es2015/regresssion-test-issue-3856.js

@@ -0,0 +1,18 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+let str = '';
+function async() {}
+
+async(str)

tests/jerry/es2015/regresssion-test-issue-3857.js

@@ -0,0 +1,17 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+function async() {}
+
+new async