Implement throwing ReferenceErrors for let/const variables. (#3264)

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

tests/jerry/es2015/let10.js

@@ -0,0 +1,45 @@
+/* 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 check_reference_error (code)
+{
+  try {
+    eval (code);
+    assert (false);
+  } catch (e) {
+    assert (e instanceof ReferenceError);
+  }
+}
+
+check_reference_error ("let b = a, a;");
+check_reference_error ("const b = b;");
+check_reference_error ("a; let b, a;");
+check_reference_error ("a = 1; let b, a;");
+
+function f() {
+  return x + y.a;
+}
+
+check_reference_error ("x");
+check_reference_error ("y");
+check_reference_error ("x = 1");
+check_reference_error ("y = 1");
+
+let x = 6;
+assert (x === 6);
+let y = { a: 7 };
+assert (y.a === 7);
+
+assert (f() === 13);

tests/jerry/try-eval.js

@@ -0,0 +1,31 @@
+// 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.
+
+try {
+  e;
+  assert (false);
+} catch (e) {
+  eval("var e");
+}
+assert (e === undefined);
+
+function f() {
+  try {
+    throw 1;
+    assert (false);
+  } catch (e) {
+    eval("var e");
+  }
+}
+f();

tests/unit-core/test-snapshot.c

@@ -223,7 +223,7 @@ main (void)
     /* Check the snapshot data. Unused bytes should be filled with zeroes */
     const uint8_t expected_data[] =
     {
-      0x4A, 0x52, 0x52, 0x59, 0x1B, 0x00, 0x00, 0x00,
+      0x4A, 0x52, 0x52, 0x59, 0x1C, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00,
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x01, 0x00, 0x21, 0x00, 0x01, 0x00,