[promises] Port PromiseConstructor to Torque.

Bug: v8:9838
Change-Id: Iceeb7e274c0cc9fd7066fa538818aebf23ce2678
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1925566
Commit-Queue: Joshua Litt <joshualitt@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65176}

BUILD.gn

@@ -972,6 +972,7 @@ torque_files = [
   "src/builtins/object-fromentries.tq",
   "src/builtins/object.tq",
   "src/builtins/promise-abstract-operations.tq",
+  "src/builtins/promise-constructor.tq",
   "src/builtins/proxy-constructor.tq",
   "src/builtins/proxy-delete-property.tq",
   "src/builtins/proxy-get-property.tq",

src/builtins/builtins-definitions.h

@@ -717,8 +717,6 @@ namespace internal {
   TFJ(PromiseGetCapabilitiesExecutor, 2, kReceiver, kResolve, kReject)         \
   TFJ(PromiseConstructorLazyDeoptContinuation, 4, kReceiver, kPromise,         \
       kReject, kException, kResult)                                            \
-  /* ES6 #sec-promise-executor */                                              \
-  TFJ(PromiseConstructor, 1, kReceiver, kExecutor)                             \
   CPP(IsPromise)                                                               \
   /* ES #sec-promise.prototype.then */                                         \
   TFJ(PromisePrototypeThen, 2, kReceiver, kOnFulfilled, kOnRejected)           \

src/builtins/builtins-promise-gen.cc

@@ -441,7 +441,8 @@ void PromiseBuiltinsAssembler::BranchIfPromiseThenLookupChainIntact(
 
 void PromiseBuiltinsAssembler::BranchIfAccessCheckFailed(
     SloppyTNode<Context> context, SloppyTNode<Context> native_context,
-    Node* promise_constructor, Node* executor, Label* if_noaccess) {
+    TNode<Object> promise_constructor, TNode<Object> executor,
+    Label* if_noaccess) {
   VARIABLE(var_executor, MachineRepresentation::kTagged);
   var_executor.Bind(executor);
   Label has_access(this), call_runtime(this, Label::kDeferred);
@@ -528,119 +529,6 @@ TF_BUILTIN(PromiseConstructorLazyDeoptContinuation, PromiseBuiltinsAssembler) {
   Return(promise);
 }
 
-// ES6 #sec-promise-executor
-TF_BUILTIN(PromiseConstructor, PromiseBuiltinsAssembler) {
-  TNode<Object> executor = CAST(Parameter(Descriptor::kExecutor));
-  TNode<Object> new_target = CAST(Parameter(Descriptor::kJSNewTarget));
-  TNode<Context> context = CAST(Parameter(Descriptor::kContext));
-  Isolate* isolate = this->isolate();
-
-  Label if_targetisundefined(this, Label::kDeferred);
-
-  GotoIf(IsUndefined(new_target), &if_targetisundefined);
-
-  Label if_notcallable(this, Label::kDeferred);
-
-  GotoIf(TaggedIsSmi(executor), &if_notcallable);
-
-  const TNode<Map> executor_map = LoadMap(CAST(executor));
-  GotoIfNot(IsCallableMap(executor_map), &if_notcallable);
-
-  const TNode<NativeContext> native_context = LoadNativeContext(context);
-  const TNode<JSFunction> promise_fun =
-      CAST(LoadContextElement(native_context, Context::PROMISE_FUNCTION_INDEX));
-  Node* const is_debug_active = IsDebugActive();
-  Label if_targetisnotmodified(this),
-      if_targetismodified(this, Label::kDeferred), run_executor(this),
-      debug_push(this), if_noaccess(this, Label::kDeferred);
-
-  BranchIfAccessCheckFailed(context, native_context, promise_fun, executor,
-                            &if_noaccess);
-
-  Branch(TaggedEqual(promise_fun, new_target), &if_targetisnotmodified,
-         &if_targetismodified);
-
-  VARIABLE(var_result, MachineRepresentation::kTagged);
-  VARIABLE(var_reject_call, MachineRepresentation::kTagged);
-  VARIABLE(var_reason, MachineRepresentation::kTagged);
-
-  BIND(&if_targetisnotmodified);
-  {
-    const TNode<JSPromise> instance = AllocateAndInitJSPromise(context);
-    var_result.Bind(instance);
-    Goto(&debug_push);
-  }
-
-  BIND(&if_targetismodified);
-  {
-    ConstructorBuiltinsAssembler constructor_assembler(this->state());
-    TNode<JSObject> instance = constructor_assembler.EmitFastNewObject(
-        context, promise_fun, CAST(new_target));
-    PromiseInit(instance);
-    var_result.Bind(instance);
-
-    GotoIfNot(IsPromiseHookEnabledOrHasAsyncEventDelegate(), &debug_push);
-    CallRuntime(Runtime::kPromiseHookInit, context, instance,
-                UndefinedConstant());
-    Goto(&debug_push);
-  }
-
-  BIND(&debug_push);
-  {
-    GotoIfNot(is_debug_active, &run_executor);
-    CallRuntime(Runtime::kDebugPushPromise, context, var_result.value());
-    Goto(&run_executor);
-  }
-
-  BIND(&run_executor);
-  {
-    Label out(this), if_rejectpromise(this), debug_pop(this, Label::kDeferred);
-
-    PromiseResolvingFunctions funcs = CreatePromiseResolvingFunctions(
-        context, CAST(var_result.value()), TrueConstant(), native_context);
-    Node *resolve = funcs.resolve, *reject = funcs.reject;
-
-    Node* const maybe_exception = CallJS(
-        CodeFactory::Call(isolate, ConvertReceiverMode::kNullOrUndefined),
-        context, executor, UndefinedConstant(), resolve, reject);
-
-    GotoIfException(maybe_exception, &if_rejectpromise, &var_reason);
-    Branch(is_debug_active, &debug_pop, &out);
-
-    BIND(&if_rejectpromise);
-    {
-      CallJS(CodeFactory::Call(isolate, ConvertReceiverMode::kNullOrUndefined),
-             context, reject, UndefinedConstant(), var_reason.value());
-      Branch(is_debug_active, &debug_pop, &out);
-    }
-
-    BIND(&debug_pop);
-    {
-      CallRuntime(Runtime::kDebugPopPromise, context);
-      Goto(&out);
-    }
-    BIND(&out);
-    Return(var_result.value());
-  }
-
-  // 1. If NewTarget is undefined, throw a TypeError exception.
-  BIND(&if_targetisundefined);
-  ThrowTypeError(context, MessageTemplate::kNotAPromise, new_target);
-
-  // 2. If IsCallable(executor) is false, throw a TypeError exception.
-  BIND(&if_notcallable);
-  ThrowTypeError(context, MessageTemplate::kResolverNotAFunction, executor);
-
-  // Silently fail if the stack looks fishy.
-  BIND(&if_noaccess);
-  {
-    const TNode<Smi> counter_id =
-        SmiConstant(v8::Isolate::kPromiseConstructorReturnedUndefined);
-    CallRuntime(Runtime::kIncrementUseCounter, context, counter_id);
-    Return(UndefinedConstant());
-  }
-}
-
 // ES#sec-promise.prototype.then
 // Promise.prototype.then ( onFulfilled, onRejected )
 TF_BUILTIN(PromisePrototypeThen, PromiseBuiltinsAssembler) {

src/builtins/builtins-promise-gen.h

@@ -66,9 +66,13 @@ class V8_EXPORT_PRIVATE PromiseBuiltinsAssembler : public CodeStubAssembler {
       TNode<JSPromise> promise, TNode<Object> debug_event,
       TNode<NativeContext> native_context);
 
- protected:
+  void BranchIfAccessCheckFailed(SloppyTNode<Context> context,
+                                 SloppyTNode<Context> native_context,
+                                 TNode<Object> promise_constructor,
+                                 TNode<Object> executor, Label* if_noaccess);
   void PromiseInit(Node* promise);
 
+ protected:
   void PromiseSetHasHandler(Node* promise);
   void PromiseSetHandledHint(Node* promise);
 
@@ -106,11 +110,6 @@ class V8_EXPORT_PRIVATE PromiseBuiltinsAssembler : public CodeStubAssembler {
   template <typename... TArgs>
   Node* InvokeThen(Node* native_context, Node* receiver, TArgs... args);
 
-  void BranchIfAccessCheckFailed(SloppyTNode<Context> context,
-                                 SloppyTNode<Context> native_context,
-                                 Node* promise_constructor, Node* executor,
-                                 Label* if_noaccess);
-
   std::pair<Node*, Node*> CreatePromiseFinallyFunctions(Node* on_finally,
                                                         Node* constructor,
                                                         Node* native_context);

src/builtins/promise-constructor.tq

@@ -0,0 +1,108 @@
+// Copyright 2019 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-constructor-gen.h'
+#include 'src/builtins/builtins-promise-gen.h'
+
+namespace runtime {
+  extern transitioning runtime
+  DebugPushPromise(implicit context: Context)(JSAny): JSAny;
+
+  extern transitioning runtime
+  DebugPopPromise(implicit context: Context)(): JSAny;
+
+  extern transitioning runtime
+  PromiseHookInit(implicit context: Context)(Object, Object): JSAny;
+}
+
+// https://tc39.es/ecma262/#sec-promise-constructor
+namespace promise {
+
+  extern runtime IncrementUseCounter(Context, Smi): void;
+  type UseCounterFeature extends int31
+  constexpr 'v8::Isolate::UseCounterFeature';
+  const kNotAPromise: constexpr MessageTemplate
+  generates 'MessageTemplate::kNotAPromise';
+  const kResolverNotAFunction: constexpr MessageTemplate
+  generates 'MessageTemplate::kResolverNotAFunction';
+  const kPromiseConstructorReturnedUndefined: constexpr UseCounterFeature
+  generates 'v8::Isolate::kPromiseConstructorReturnedUndefined';
+
+  extern macro
+  PromiseBuiltinsAssembler::BranchIfAccessCheckFailed(
+      Context, Context, Object, Object): void labels NoAccess;
+
+  extern macro
+  IsDebugActive(): bool;
+
+  transitioning macro
+  HasAccessCheckFailed(
+      context: Context, nativeContext: Context, promiseFun: Object,
+      executor: Object): bool {
+    BranchIfAccessCheckFailed(context, nativeContext, promiseFun, executor)
+        otherwise return true;
+    return false;
+  }
+
+  extern macro ConstructorBuiltinsAssembler::EmitFastNewObject(
+      Context, JSFunction, JSReceiver): JSObject;
+
+  extern macro PromiseBuiltinsAssembler::PromiseInit(Object): void;
+
+  extern macro
+  PromiseBuiltinsAssembler::IsPromiseHookEnabledOrHasAsyncEventDelegate(): bool;
+
+  // https://tc39.es/ecma262/#sec-promise-executor
+  transitioning javascript builtin
+  PromiseConstructor(
+      js-implicit context: NativeContext, receiver: JSAny,
+      newTarget: JSAny)(executor: JSAny): JSAny {
+    // 1. If NewTarget is undefined, throw a TypeError exception.
+    if (newTarget == Undefined) {
+      ThrowTypeError(kNotAPromise, newTarget);
+    }
+
+    // 2. If IsCallable(executor) is false, throw a TypeError exception.
+    if (!TaggedIsCallable(executor)) {
+      ThrowTypeError(kResolverNotAFunction, executor);
+    }
+
+    const promiseFun = UnsafeCast<JSFunction>(context[PROMISE_FUNCTION_INDEX]);
+
+    // Silently fail if the stack looks fishy.
+    if (HasAccessCheckFailed(context, context, promiseFun, executor)) {
+      IncrementUseCounter(
+          context, SmiConstant(kPromiseConstructorReturnedUndefined));
+      return Undefined;
+    }
+
+    let result: JSPromise;
+    if (promiseFun == newTarget) {
+      result = AllocateAndInitJSPromise(context);
+    } else {
+      const resultObject = EmitFastNewObject(
+          context, promiseFun, UnsafeCast<JSReceiver>(newTarget));
+      PromiseInit(resultObject);
+      result = UnsafeCast<JSPromise>(resultObject);
+      if (IsPromiseHookEnabledOrHasAsyncEventDelegate()) {
+        runtime::PromiseHookInit(result, Undefined);
+      }
+    }
+
+    const isDebugActive = IsDebugActive();
+    if (isDebugActive) runtime::DebugPushPromise(result);
+
+    const funcs = CreatePromiseResolvingFunctions(result, True, context);
+    const resolve = funcs.resolve;
+    const reject = funcs.reject;
+    try {
+      Call(context, UnsafeCast<Callable>(executor), Undefined, resolve, reject);
+    } catch (e) {
+      Call(context, reject, Undefined, e);
+    }
+
+    if (isDebugActive) runtime::DebugPopPromise();
+    return result;
+  }
+}