[stubs] A new approach to TF stubs

test/cctest/compiler/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/interface-descriptors.h"
+#include "src/isolate.h"
+#include "test/cctest/compiler/function-tester.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+
+class CodeStubAssemblerTester : public CodeStubAssembler {
+ public:
+  CodeStubAssemblerTester(Isolate* isolate,
+                          const CallInterfaceDescriptor& descriptor)
+      : CodeStubAssembler(isolate, isolate->runtime_zone(), descriptor,
+                          Code::STUB, "test"),
+        scope_(isolate) {}
+
+ private:
+  HandleScope scope_;
+  LocalContext context_;
+};
+
+
+TEST(SimpleSmiReturn) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  m.Return(m.SmiTag(m.Int32Constant(37)));
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(37, Handle<Smi>::cast(result.ToHandleChecked())->value());
+}
+
+
+TEST(SimpleIntPtrReturn) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  int test;
+  m.Return(m.IntPtrConstant(reinterpret_cast<intptr_t>(&test)));
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(reinterpret_cast<intptr_t>(&test),
+           reinterpret_cast<intptr_t>(*result.ToHandleChecked()));
+}
+
+
+TEST(SimpleDoubleReturn) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  m.Return(m.NumberConstant(0.5));
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(0.5, Handle<HeapNumber>::cast(result.ToHandleChecked())->value());
+}
+
+
+TEST(SimpleCallRuntime1Arg) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  Node* context = m.HeapConstant(Handle<Context>(isolate->native_context()));
+  Node* b = m.SmiTag(m.Int32Constant(256));
+  m.Return(m.CallRuntime(Runtime::kMathSqrt, context, b));
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(16, Handle<Smi>::cast(result.ToHandleChecked())->value());
+}
+
+
+TEST(SimpleTailCallRuntime1Arg) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  Node* context = m.HeapConstant(Handle<Context>(isolate->native_context()));
+  Node* b = m.SmiTag(m.Int32Constant(256));
+  m.TailCallRuntime(Runtime::kMathSqrt, context, b);
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(16, Handle<Smi>::cast(result.ToHandleChecked())->value());
+}
+
+
+TEST(SimpleCallRuntime2Arg) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  Node* context = m.HeapConstant(Handle<Context>(isolate->native_context()));
+  Node* a = m.SmiTag(m.Int32Constant(2));
+  Node* b = m.SmiTag(m.Int32Constant(4));
+  m.Return(m.CallRuntime(Runtime::kMathPow, context, a, b));
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(16, Handle<Smi>::cast(result.ToHandleChecked())->value());
+}
+
+
+TEST(SimpleTailCallRuntime2Arg) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  Node* context = m.HeapConstant(Handle<Context>(isolate->native_context()));
+  Node* a = m.SmiTag(m.Int32Constant(2));
+  Node* b = m.SmiTag(m.Int32Constant(4));
+  m.TailCallRuntime(Runtime::kMathPow, context, a, b);
+  Handle<Code> code = m.GenerateCode();
+  FunctionTester ft(descriptor, code);
+  MaybeHandle<Object> result = ft.Call();
+  CHECK_EQ(16, Handle<Smi>::cast(result.ToHandleChecked())->value());
+}
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8