Port r6301 to 2.5 branch.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
===================================================================
--- test/cctest/test-api.cc	(revision 6311)
+++ test/cctest/test-api.cc	(working copy)
@@ -814,6 +814,75 @@
 }
 
 
+static void* expected_ptr;
+static v8::Handle<v8::Value> callback(const v8::Arguments& args) {
+  void* ptr = v8::External::Unwrap(args.Data());
+  CHECK_EQ(expected_ptr, ptr);
+  return v8::Boolean::New(true);
+}
+
+
+static void TestExternalPointerWrapping() {
+  v8::HandleScope scope;
+  LocalContext env;
+
+  v8::Handle<v8::Value> data = v8::External::Wrap(expected_ptr);
+
+  v8::Handle<v8::Object> obj = v8::Object::New();
+  obj->Set(v8_str("func"),
+           v8::FunctionTemplate::New(callback, data)->GetFunction());
+  env->Global()->Set(v8_str("obj"), obj);
+
+  CHECK(CompileRun(
+        "function foo() {\n"
+        "  for (var i = 0; i < 13; i++) obj.func();\n"
+        "}\n"
+        "foo(), true")->BooleanValue());
+}
+
+
+THREADED_TEST(ExternalWrap) {
+  // Check heap allocated object.
+  int* ptr = new int;
+  expected_ptr = ptr;
+  TestExternalPointerWrapping();
+  delete ptr;
+
+  // Check stack allocated object.
+  int foo;
+  expected_ptr = &foo;
+  TestExternalPointerWrapping();
+
+  // Check not aligned addresses.
+  const int n = 100;
+  char* s = new char[n];
+  for (int i = 0; i < n; i++) {
+    expected_ptr = s + i;
+    TestExternalPointerWrapping();
+  }
+
+  delete[] s;
+
+  // Check several invalid addresses.
+  expected_ptr = reinterpret_cast<void*>(1);
+  TestExternalPointerWrapping();
+
+  expected_ptr = reinterpret_cast<void*>(0xdeadbeef);
+  TestExternalPointerWrapping();
+
+  expected_ptr = reinterpret_cast<void*>(0xdeadbeef + 1);
+  TestExternalPointerWrapping();
+
+#if defined(V8_HOST_ARCH_X64)
+  expected_ptr = reinterpret_cast<void*>(0xdeadbeefdeadbeef);
+  TestExternalPointerWrapping();
+
+  expected_ptr = reinterpret_cast<void*>(0xdeadbeefdeadbeef + 1);
+  TestExternalPointerWrapping();
+#endif
+}
+
+
 THREADED_TEST(FindInstanceInPrototypeChain) {
   v8::HandleScope scope;
   LocalContext env;