Set the current context to the function's context when entering to LAP.

test/unittests/api/v8-object-unittest.cc

 // Copyright 2017 the V8 project authors. 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/v8.h"
+#include "src/api.h"
+#include "src/objects-inl.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace v8 {
 namespace {
 
 using ObjectTest = TestWithContext;
 
 void accessor_name_getter_callback(Local<Name>,
                                    const PropertyCallbackInfo<Value>&) {}
@@ skipping 10 matching lines @@
   prop_desc.set_configurable(false);
   global->DefineProperty(context(), property_name, prop_desc).ToChecked();
 
   Maybe<bool> result = global->SetAccessor(context(), property_name,
                                            accessor_name_getter_callback);
   ASSERT_TRUE(result.IsJust());
   ASSERT_FALSE(result.FromJust());
   ASSERT_FALSE(try_catch.HasCaught());
 }
 
+using LapContextTest = TestWithIsolate;
+
+TEST_F(LapContextTest, CurrentContextMustBeFunctionContext) {
+  // The receiver object is created in |receiver_context|, but its prototype
+  // object is created in |prototype_context|, and the property is accessed
+  // from |caller_context|.
+  Local<Context> receiver_context = Context::New(isolate());
+  Local<Context> prototype_context = Context::New(isolate());
+  Local<Context> caller_context = Context::New(isolate());
+
+  Local<FunctionTemplate> function_template = FunctionTemplate::New(isolate());
+  Local<String> property_key =
+      String::NewFromUtf8(isolate(), "property", NewStringType::kNormal)
+          .ToLocalChecked();
+  Local<FunctionTemplate> get_or_set = FunctionTemplate::New(
+      isolate(),
+      [](const FunctionCallbackInfo<Value>& info) {
+        Local<Context> prototype_context = *reinterpret_cast<Local<Context>*>(
+            info.Data().As<External>()->Value());
+        EXPECT_EQ(prototype_context, info.GetIsolate()->GetCurrentContext());
+      },
+      External::New(isolate(), &prototype_context));
+  function_template->PrototypeTemplate()->SetAccessorProperty(
+      property_key, get_or_set, get_or_set);
+
+  // |object| is created in |receiver_context|, and |prototype| is created
+  // in |prototype_context|.  And then, object.__proto__ = prototype.
+  Local<Function> interface_for_receiver =
+      function_template->GetFunction(receiver_context).ToLocalChecked();
+  Local<Function> interface_for_prototype =
+      function_template->GetFunction(prototype_context).ToLocalChecked();
+  Local<String> prototype_key =
+      String::NewFromUtf8(isolate(), "prototype", NewStringType::kNormal)
+          .ToLocalChecked();
+  Local<Object> prototype =
+      interface_for_prototype->Get(caller_context, prototype_key)
+          .ToLocalChecked()
+          .As<Object>();
+  Local<Object> object =
+      interface_for_receiver->NewInstance(receiver_context).ToLocalChecked();
+  object->SetPrototype(caller_context, prototype).ToChecked();
+  EXPECT_EQ(receiver_context, object->CreationContext());
+  EXPECT_EQ(prototype_context, prototype->CreationContext());
+
+  object->Get(caller_context, property_key).ToLocalChecked();
+  object->Set(caller_context, property_key, Null(isolate())).ToChecked();
+
+  // Test with a compiled version.
+  Local<String> object_key =
+      String::NewFromUtf8(isolate(), "object", NewStringType::kNormal)
+          .ToLocalChecked();
+  caller_context->Global()->Set(caller_context, object_key, object).ToChecked();
+  const char script[] =
+      "function f() { return object.property; } "
+      "f(); f(); "
+      "%OptimizeFunctionOnNextCall(f); "
+      "f();";
+  Context::Scope scope(caller_context);
+  internal::FLAG_allow_natives_syntax = true;
+  Script::Compile(
+      caller_context,
+      String::NewFromUtf8(isolate(), script, v8::NewStringType::kNormal)
+          .ToLocalChecked())
+      .ToLocalChecked()
+      ->Run(caller_context)
+      .ToLocalChecked();
+}
+
 }  // namespace
 }  // namespace v8