Implement throwing const re-assignment error. (#3697)

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

tests/jerry/es2015/const1.js

@@ -0,0 +1,74 @@
+/* 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.
+ */
+
+const a = 6
+assert(!delete a)
+assert(a === 6)
+
+try {
+  eval("a = 7")
+  assert(false)
+} catch (e) {
+  assert(e instanceof TypeError)
+}
+
+function check_type_error(code) {
+  try {
+    eval(code)
+    assert(false)
+  } catch (e) {
+    assert(e instanceof TypeError)
+  }
+}
+
+// Register cases
+check_type_error("{ const a = 0; a = 1 }");
+check_type_error("{ const a = 0; a += 1 }");
+check_type_error("{ const a = 0; a -= 1 }");
+check_type_error("{ const a = 0; a *= 1 }");
+check_type_error("{ const a = 0; a %= 1 }");
+check_type_error("{ const a = 0; a /= 1 }");
+check_type_error("{ const a = 0; a <<= 1 }");
+check_type_error("{ const a = 0; a >>= 1 }");
+check_type_error("{ const a = 0; a >>>= 1 }");
+check_type_error("{ const a = 0; a &= 1 }");
+check_type_error("{ const a = 0; a |= 1 }");
+check_type_error("{ const a = 0; a ^= 1 }");
+check_type_error("{ const a = 0; a++ }");
+check_type_error("{ const a = 0; a-- }");
+check_type_error("{ const a = 0; ++a }");
+check_type_error("{ const a = 0; --a }");
+check_type_error("{ const a = 0; [a] = [1] }");
+check_type_error("{ const a = 0; ({a} = { a:1 }) }");
+
+// Non-register cases
+check_type_error("{ const a = 0; (function (){ a = 1 })() }");
+check_type_error("{ const a = 0; (function (){ a += 1 })() }");
+check_type_error("{ const a = 0; (function (){ a -= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a *= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a %= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a /= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a <<= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a >>= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a >>>= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a &= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a |= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a ^= 1 })() }");
+check_type_error("{ const a = 0; (function (){ a++ })() }");
+check_type_error("{ const a = 0; (function (){ a-- })() }");
+check_type_error("{ const a = 0; (function (){ ++a })() }");
+check_type_error("{ const a = 0; (function (){ --a })() }");
+check_type_error("{ const a = 0; (function (){ [a] = [1] })() }");
+check_type_error("{ const a = 0; (function (){ ({a} = { a:1 }) })() }");

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, 0x29, 0x00, 0x00, 0x00,
+      0x4A, 0x52, 0x52, 0x59, 0x2A, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00,
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x01, 0x00, 0x41, 0x00, 0x01, 0x00,