Add PromiseReactionJobInfo to CSA

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2573703002
Cr-Commit-Position: refs/heads/master@{#41674}

src/code-stub-assembler.cc

@@ -8246,5 +8246,26 @@ void CodeStubAssembler::PromiseSet(Node* promise, Node* status, Node* result) {
   StoreObjectField(promise, JSPromise::kFlagsOffset, SmiConstant(0));
 }
 
+Node* CodeStubAssembler::AllocatePromiseReactionJobInfo(Node* value,
+                                                        Node* tasks,
+                                                        Node* deferred,
+                                                        Node* context) {
+  Node* const result = Allocate(PromiseReactionJobInfo::kSize);
+  StoreMapNoWriteBarrier(result, Heap::kPromiseReactionJobInfoMapRootIndex);
+  StoreObjectFieldNoWriteBarrier(result, PromiseReactionJobInfo::kValueOffset,
+                                 value);
+  StoreObjectFieldNoWriteBarrier(result, PromiseReactionJobInfo::kTasksOffset,
+                                 tasks);
+  StoreObjectFieldNoWriteBarrier(
+      result, PromiseReactionJobInfo::kDeferredOffset, deferred);
+  StoreObjectFieldRoot(result, PromiseReactionJobInfo::kDebugIdOffset,
+                       Heap::kUndefinedValueRootIndex);
+  StoreObjectFieldRoot(result, PromiseReactionJobInfo::kDebugNameOffset,
+                       Heap::kUndefinedValueRootIndex);
+  StoreObjectFieldNoWriteBarrier(result, PromiseReactionJobInfo::kContextOffset,
+                                 context);
+  return result;
+}
+
 }  // namespace internal
 }  // namespace v8

src/code-stub-assembler.h

@@ -1089,6 +1089,9 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   // provides a helper for certain init patterns.
   void PromiseSet(Node* promise, Node* status, Node* result);
 
+  Node* AllocatePromiseReactionJobInfo(Node* value, Node* tasks, Node* deferred,
+                                       Node* context);
+
  protected:
   void DescriptorLookupLinear(Node* unique_name, Node* descriptors, Node* nof,
                               Label* if_found, Variable* var_name_index,

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

@@ -2069,5 +2069,39 @@ TEST(PromiseSet) {
   CHECK(!js_promise->has_handler());
 }
 
+TEST(AllocatePromiseReactionJobInfo) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+
+  const int kNumParams = 1;
+  CodeAssemblerTester data(isolate, kNumParams);
+  CodeStubAssembler m(data.state());
+
+  Node* const context = m.Parameter(kNumParams + 2);
+  Node* const tasks = m.AllocateFixedArray(FAST_ELEMENTS, m.Int32Constant(1));
+  m.StoreFixedArrayElement(tasks, 0, m.UndefinedConstant());
+  Node* const deferred =
+      m.AllocateFixedArray(FAST_ELEMENTS, m.Int32Constant(1));
+  m.StoreFixedArrayElement(deferred, 0, m.UndefinedConstant());
+  Node* const info = m.AllocatePromiseReactionJobInfo(m.SmiConstant(1), tasks,
+                                                      deferred, context);
+  m.Return(info);
+
+  Handle<Code> code = data.GenerateCode();
+  CHECK(!code.is_null());
+
+  FunctionTester ft(code, kNumParams);
+  Handle<Object> result =
+      ft.Call(isolate->factory()->undefined_value()).ToHandleChecked();
+  CHECK(result->IsPromiseReactionJobInfo());
+  Handle<PromiseReactionJobInfo> promise_info =
+      Handle<PromiseReactionJobInfo>::cast(result);
+  CHECK_EQ(Smi::FromInt(1), promise_info->value());
+  CHECK(promise_info->tasks()->IsFixedArray());
+  CHECK(promise_info->deferred()->IsFixedArray());
+  CHECK(promise_info->context()->IsContext());
+  CHECK(promise_info->debug_id()->IsUndefined(isolate));
+  CHECK(promise_info->debug_name()->IsUndefined(isolate));
+}
+
 }  // namespace internal
 }  // namespace v8