[promisehook] Add is_promisehook_enabled

test/cctest/test-code-stub-assembler.cc

 // Copyright 2015 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 "src/base/utils/random-number-generator.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/compiler/node.h"
 #include "src/isolate.h"
 #include "test/cctest/compiler/code-assembler-tester.h"
@@ skipping 1954 matching lines @@
     Recompile<KeyedLoadICTFStub>(isolate);
     Recompile<KeyedLoadICTrampolineTFStub>(isolate);
     Recompile<StoreICStub>(isolate, StoreICState(STRICT));
     Recompile<StoreICTrampolineStub>(isolate, StoreICState(STRICT));
     Recompile<KeyedStoreICTFStub>(isolate, StoreICState(STRICT));
     Recompile<KeyedStoreICTrampolineTFStub>(isolate, StoreICState(STRICT));
   }
   v8_isolate->Dispose();
 }
 
+TEST(IsPromiseHookEnabled) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+
+  const int kNumParams = 1;
+  CodeAssemblerTester data(isolate, kNumParams);
+  CodeStubAssembler m(data.state());
+
+  m.Return(m.SelectBooleanConstant(m.IsPromiseHookEnabled()));
+
+  Handle<Code> code = data.GenerateCode();
+  CHECK(!code.is_null());
+
+  FunctionTester ft(code, kNumParams);
+  CHECK_EQ(false, isolate->IsPromiseHookEnabled());
+  Handle<Object> result =
+      ft.Call(isolate->factory()->undefined_value()).ToHandleChecked();
+  CHECK_EQ(isolate->heap()->false_value(), *result);
+
+  isolate->EnablePromiseHook();
+  result = ft.Call(isolate->factory()->undefined_value()).ToHandleChecked();
+  CHECK_EQ(isolate->heap()->true_value(), *result);
+
+  isolate->DisablePromiseHook();
+  result = ft.Call(isolate->factory()->undefined_value()).ToHandleChecked();
+  CHECK_EQ(isolate->heap()->false_value(), *result);
+}
+
 }  // namespace internal
 }  // namespace v8