[async-await] Move PromiseCreate and PromiseRelease to TF

src/builtins/builtins-async-await.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 "src/builtins/builtins-promise.h"
+#include "src/builtins/builtins-utils.h"
+#include "src/builtins/builtins.h"
+#include "src/code-stub-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+typedef compiler::Node Node;
+typedef CodeStubAssembler::ParameterMode ParameterMode;
+typedef compiler::CodeAssemblerState CodeAssemblerState;
+
+class AsyncAwaitBuiltinsAssembler : public PromiseBuiltinsAssembler {
+ public:
+  explicit AsyncAwaitBuiltinsAssembler(CodeAssemblerState* state)
+      : PromiseBuiltinsAssembler(state) {}
+};
+
+TF_BUILTIN(AsyncFunctionPromiseCreate, AsyncAwaitBuiltinsAssembler) {
+  CSA_ASSERT_JS_ARGC_EQ(this, 0);
+  Node* const context = Parameter(3);
+
+  Node* const parent = UndefinedConstant();
+  Node* const promise = AllocateAndInitJSPromise(context, parent);

[gsathya, 2017/01/18 18:58:42]

You don't need the parent here, default is undefined

[jgruber, 2017/01/19 08:58:11]

Done.

+
+  Label if_is_debug_active(this, Label::kDeferred);
+  GotoIf(IsDebugActive(), &if_is_debug_active);
+
+  // Early exit if debug is not active.
+  Return(promise);
+
+  Bind(&if_is_debug_active);
+  {
+    // Push the Promise under construction in an async function on
+    // the catch prediction stack to handle exceptions thrown before
+    // the first await.
+    // Assign ID and create a recurring task to save stack for future
+    // resumptions from await.
+    CallRuntime(Runtime::kDebugAsyncFunctionPromiseCreated, context, promise);
+    Return(promise);
+  }
+}
+
+TF_BUILTIN(AsyncFunctionPromiseRelease, AsyncAwaitBuiltinsAssembler) {
+  CSA_ASSERT_JS_ARGC_EQ(this, 1);
+  Node* const promise = Parameter(1);
+  Node* const context = Parameter(4);
+
+  Label if_is_debug_active(this, Label::kDeferred);
+  GotoIf(IsDebugActive(), &if_is_debug_active);
+
+  // Early exit if debug is not active.
+  Return(UndefinedConstant());
+
+  Bind(&if_is_debug_active);
+  {
+    // Pop the Promise under construction in an async function on
+    // from catch prediction stack.
+    CallRuntime(Runtime::kDebugPopPromise, context);
+    Return(promise);
+  }
+}
+
+}  // namespace internal
+}  // namespace v8