Implement the core of let/const statement. (#3239)

This patch implements the core part of let/const statements. Redeclarations are correctly detected and separate contexts are correctly created for these statements. Register optimizations are also emplyed whenever possible. Lots of features are still missing: - checking the var statements in eval - const are treated as lets - single statement checks are missing - export declarations are exported as vars, let/const export is not supported JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2019-10-25 18:08:10 +02:00
parent 4b352758c1
commit 3d797b8836
33 changed files with 1997 additions and 217 deletions
@@ -0,0 +1,68 @@
+/* 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.
+ */
+
+
+assert (typeof f === "undefined");
+
+function g() { return 6; }
+
+switch (g()) {
+case f():
+
+  let g = 9;
+
+  assert (g === 9);
+
+  function f() { return 6; }
+  break;
+
+default:
+  assert (false);
+}
+
+assert (f() === 6);
+
+switch (g()) {
+case f() - 2:
+
+  let g = 9;
+
+  assert ((function() { return g + f(); })() === 17);
+
+  function f() { return 8; }
+  break;
+
+default:
+  assert (false);
+}
+
+assert (f() === 8);
+
+switch (g()) {
+case g() * 2:
+
+  {
+    let g = 4;
+    assert (g == 4);
+  }
+
+  function g() { return 3; }
+  break;
+
+default:
+  assert (false);
+}
+
+assert (g() === 3);