Become: Also forward identity hashes.

runtime/vm/isolate_reload_test.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
@@ skipping 2798 matching lines @@
       "main() {\n"
       "  return '$a $b';\n"
       "}\n";
 
   lib = TestCase::ReloadTestScript(kReloadScript);
   EXPECT_VALID(lib);
   EXPECT_STREQ("Instance of 'A' Instance of 'B'", SimpleInvokeStr(lib, "main"));
 }
 
 
+TEST_CASE(IsolateReload_ShapeChangeRetainsHash) {
+  const char* kScript =
+      "class A{\n"
+      "  var x;\n"
+      "}\n"
+      "var a, hash1, hash2;\n"
+      "main() {\n"
+      "  a = new A();\n"
+      "  hash1 = a.hashCode;\n"
+      "  return 'okay';\n"
+      "}\n";
+
+  Dart_Handle lib = TestCase::LoadTestScript(kScript, NULL);
+  EXPECT_VALID(lib);
+  EXPECT_STREQ("okay", SimpleInvokeStr(lib, "main"));
+
+  const char* kReloadScript =
+      "class A{\n"
+      "  var x, y, z;\n"
+      "}\n"
+      "var a, hash1, hash2;\n"
+      "main() {\n"
+      "  hash2 = a.hashCode;\n"
+      "  return (hash1 == hash2).toString();\n"
+      "}\n";
+
+  lib = TestCase::ReloadTestScript(kReloadScript);
+  EXPECT_VALID(lib);
+  EXPECT_STREQ("true", SimpleInvokeStr(lib, "main"));
+}
+
+
+TEST_CASE(IsolateReload_StaticTearOffRetainsHash) {
+  const char* kScript =
+      "foo() {}\n"
+      "var hash1, hash2;\n"
+      "main() {\n"
+      "  hash1 = foo.hashCode;\n"
+      "  return 'okay';\n"
+      "}\n";
+
+  Dart_Handle lib = TestCase::LoadTestScript(kScript, NULL);
+  EXPECT_VALID(lib);
+  EXPECT_STREQ("okay", SimpleInvokeStr(lib, "main"));
+
+  const char* kReloadScript =
+      "foo() {}\n"
+      "var hash1, hash2;\n"
+      "main() {\n"
+      "  hash2 = foo.hashCode;\n"
+      "  return (hash1 == hash2).toString();\n"
+      "}\n";
+
+  lib = TestCase::ReloadTestScript(kReloadScript);
+  EXPECT_VALID(lib);
+  EXPECT_STREQ("true", SimpleInvokeStr(lib, "main"));
+}
+
+
 static bool NothingModifiedCallback(const char* url, int64_t since) {
   return false;
 }
 
 
 TEST_CASE(IsolateReload_NoLibsModified) {
   const char* kImportScript =
       "importedFunc() => 'fancy';";
   TestCase::AddTestLib("test:lib1", kImportScript);
 
@@ skipping 191 matching lines @@
   EXPECT_VALID(lib);
   Dart_SetFileModifiedCallback(NULL);
 
   // Modification of an exported library propagates.
   EXPECT_STREQ("bossy pants", SimpleInvokeStr(lib, "main"));
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart