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builtins-promise-gen.cc
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builtins-promise-gen.cc
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// Copyright 2016 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-gen.h"
#include "src/builtins/builtins-constructor-gen.h"
#include "src/builtins/builtins-iterator-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/builtins/builtins.h"
#include "src/code-factory.h"
#include "src/code-stub-assembler.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
using compiler::Node;
Node* PromiseBuiltinsAssembler::AllocateJSPromise(Node* context) {
Node* const native_context = LoadNativeContext(context);
Node* const promise_fun =
LoadContextElement(native_context, Context::PROMISE_FUNCTION_INDEX);
Node* const initial_map =
LoadObjectField(promise_fun, JSFunction::kPrototypeOrInitialMapOffset);
Node* const instance = AllocateJSObjectFromMap(initial_map);
return instance;
}
void PromiseBuiltinsAssembler::PromiseInit(Node* promise) {
StoreObjectFieldNoWriteBarrier(promise, JSPromise::kStatusOffset,
SmiConstant(v8::Promise::kPending));
StoreObjectFieldNoWriteBarrier(promise, JSPromise::kFlagsOffset,
SmiConstant(0));
for (int i = 0; i < v8::Promise::kEmbedderFieldCount; i++) {
int offset = JSPromise::kSize + i * kPointerSize;
StoreObjectFieldNoWriteBarrier(promise, offset, SmiConstant(0));
}
}
Node* PromiseBuiltinsAssembler::AllocateAndInitJSPromise(Node* context) {
return AllocateAndInitJSPromise(context, UndefinedConstant());
}
Node* PromiseBuiltinsAssembler::AllocateAndInitJSPromise(Node* context,
Node* parent) {
Node* const instance = AllocateJSPromise(context);
PromiseInit(instance);
Label out(this);
GotoIfNot(IsPromiseHookEnabledOrDebugIsActive(), &out);
CallRuntime(Runtime::kPromiseHookInit, context, instance, parent);
Goto(&out);
BIND(&out);
return instance;
}
Node* PromiseBuiltinsAssembler::AllocateAndSetJSPromise(Node* context,
Node* status,
Node* result) {
CSA_ASSERT(this, TaggedIsSmi(status));
Node* const instance = AllocateJSPromise(context);
StoreObjectFieldNoWriteBarrier(instance, JSPromise::kStatusOffset, status);
StoreObjectFieldNoWriteBarrier(instance, JSPromise::kResultOffset, result);
StoreObjectFieldNoWriteBarrier(instance, JSPromise::kFlagsOffset,
SmiConstant(0));
for (int i = 0; i < v8::Promise::kEmbedderFieldCount; i++) {
int offset = JSPromise::kSize + i * kPointerSize;
StoreObjectFieldNoWriteBarrier(instance, offset, SmiConstant(0));
}
Label out(this);
GotoIfNot(IsPromiseHookEnabledOrDebugIsActive(), &out);
CallRuntime(Runtime::kPromiseHookInit, context, instance,
UndefinedConstant());
Goto(&out);
BIND(&out);
return instance;
}
std::pair<Node*, Node*>
PromiseBuiltinsAssembler::CreatePromiseResolvingFunctions(
Node* promise, Node* debug_event, Node* native_context) {
Node* const promise_context = CreatePromiseResolvingFunctionsContext(
promise, debug_event, native_context);
Node* const map = LoadContextElement(
native_context, Context::STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX);
Node* const resolve_info =
LoadContextElement(native_context, Context::PROMISE_RESOLVE_SHARED_FUN);
Node* const resolve =
AllocateFunctionWithMapAndContext(map, resolve_info, promise_context);
Node* const reject_info =
LoadContextElement(native_context, Context::PROMISE_REJECT_SHARED_FUN);
Node* const reject =
AllocateFunctionWithMapAndContext(map, reject_info, promise_context);
return std::make_pair(resolve, reject);
}
Node* PromiseBuiltinsAssembler::NewPromiseCapability(Node* context,
Node* constructor,
Node* debug_event) {
if (debug_event == nullptr) {
debug_event = TrueConstant();
}
Label if_not_constructor(this, Label::kDeferred);
GotoIf(TaggedIsSmi(constructor), &if_not_constructor);
GotoIfNot(IsConstructorMap(LoadMap(constructor)), &if_not_constructor);
Node* native_context = LoadNativeContext(context);
Node* map = LoadRoot(Heap::kJSPromiseCapabilityMapRootIndex);
Node* capability = AllocateJSObjectFromMap(map);
StoreObjectFieldNoWriteBarrier(
capability, JSPromiseCapability::kPromiseOffset, UndefinedConstant());
StoreObjectFieldNoWriteBarrier(
capability, JSPromiseCapability::kResolveOffset, UndefinedConstant());
StoreObjectFieldNoWriteBarrier(capability, JSPromiseCapability::kRejectOffset,
UndefinedConstant());
VARIABLE(var_result, MachineRepresentation::kTagged);
var_result.Bind(capability);
Label if_builtin_promise(this), if_custom_promise(this, Label::kDeferred),
out(this);
Branch(WordEqual(constructor,
LoadContextElement(native_context,
Context::PROMISE_FUNCTION_INDEX)),
&if_builtin_promise, &if_custom_promise);
BIND(&if_builtin_promise);
{
Node* promise = AllocateJSPromise(context);
PromiseInit(promise);
StoreObjectField(capability, JSPromiseCapability::kPromiseOffset, promise);
Node* resolve = nullptr;
Node* reject = nullptr;
std::tie(resolve, reject) =
CreatePromiseResolvingFunctions(promise, debug_event, native_context);
StoreObjectField(capability, JSPromiseCapability::kResolveOffset, resolve);
StoreObjectField(capability, JSPromiseCapability::kRejectOffset, reject);
GotoIfNot(IsPromiseHookEnabledOrDebugIsActive(), &out);
CallRuntime(Runtime::kPromiseHookInit, context, promise,
UndefinedConstant());
Goto(&out);
}
BIND(&if_custom_promise);
{
Label if_notcallable(this, Label::kDeferred);
Node* executor_context =
CreatePromiseGetCapabilitiesExecutorContext(capability, native_context);
Node* executor_info = LoadContextElement(
native_context, Context::PROMISE_GET_CAPABILITIES_EXECUTOR_SHARED_FUN);
Node* function_map = LoadContextElement(
native_context, Context::STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX);
Node* executor = AllocateFunctionWithMapAndContext(
function_map, executor_info, executor_context);
Node* promise = ConstructJS(CodeFactory::Construct(isolate()), context,
constructor, executor);
Node* resolve =
LoadObjectField(capability, JSPromiseCapability::kResolveOffset);
GotoIf(TaggedIsSmi(resolve), &if_notcallable);
GotoIfNot(IsCallableMap(LoadMap(resolve)), &if_notcallable);
Node* reject =
LoadObjectField(capability, JSPromiseCapability::kRejectOffset);
GotoIf(TaggedIsSmi(reject), &if_notcallable);
GotoIfNot(IsCallableMap(LoadMap(reject)), &if_notcallable);
StoreObjectField(capability, JSPromiseCapability::kPromiseOffset, promise);
Goto(&out);
BIND(&if_notcallable);
StoreObjectField(capability, JSPromiseCapability::kPromiseOffset,
UndefinedConstant());
StoreObjectField(capability, JSPromiseCapability::kResolveOffset,
UndefinedConstant());
StoreObjectField(capability, JSPromiseCapability::kRejectOffset,
UndefinedConstant());
ThrowTypeError(context, MessageTemplate::kPromiseNonCallable);
}
BIND(&if_not_constructor);
ThrowTypeError(context, MessageTemplate::kNotConstructor, constructor);
BIND(&out);
return var_result.value();
}
void PromiseBuiltinsAssembler::InitializeFunctionContext(Node* native_context,
Node* context,
int slots) {
DCHECK_GE(slots, Context::MIN_CONTEXT_SLOTS);
StoreMapNoWriteBarrier(context, Heap::kFunctionContextMapRootIndex);
StoreObjectFieldNoWriteBarrier(context, FixedArray::kLengthOffset,
SmiConstant(slots));
Node* const empty_fn =
LoadContextElement(native_context, Context::CLOSURE_INDEX);
StoreContextElementNoWriteBarrier(context, Context::CLOSURE_INDEX, empty_fn);
StoreContextElementNoWriteBarrier(context, Context::PREVIOUS_INDEX,
UndefinedConstant());
StoreContextElementNoWriteBarrier(context, Context::EXTENSION_INDEX,
TheHoleConstant());
StoreContextElementNoWriteBarrier(context, Context::NATIVE_CONTEXT_INDEX,
native_context);
}
Node* PromiseBuiltinsAssembler::CreatePromiseContext(Node* native_context,
int slots) {
DCHECK_GE(slots, Context::MIN_CONTEXT_SLOTS);
Node* const context = AllocateInNewSpace(FixedArray::SizeFor(slots));
InitializeFunctionContext(native_context, context, slots);
return context;
}
Node* PromiseBuiltinsAssembler::CreatePromiseResolvingFunctionsContext(
Node* promise, Node* debug_event, Node* native_context) {
Node* const context =
CreatePromiseContext(native_context, kPromiseContextLength);
StoreContextElementNoWriteBarrier(context, kAlreadyVisitedSlot,
SmiConstant(0));
StoreContextElementNoWriteBarrier(context, kPromiseSlot, promise);
StoreContextElementNoWriteBarrier(context, kDebugEventSlot, debug_event);
return context;
}
Node* PromiseBuiltinsAssembler::CreatePromiseGetCapabilitiesExecutorContext(
Node* promise_capability, Node* native_context) {
int kContextLength = kCapabilitiesContextLength;
Node* context = CreatePromiseContext(native_context, kContextLength);
StoreContextElementNoWriteBarrier(context, kCapabilitySlot,
promise_capability);
return context;
}
Node* PromiseBuiltinsAssembler::ThrowIfNotJSReceiver(
Node* context, Node* value, MessageTemplate::Template msg_template,
const char* method_name) {
Label out(this), throw_exception(this, Label::kDeferred);
VARIABLE(var_value_map, MachineRepresentation::kTagged);
GotoIf(TaggedIsSmi(value), &throw_exception);
// Load the instance type of the {value}.
var_value_map.Bind(LoadMap(value));
Node* const value_instance_type = LoadMapInstanceType(var_value_map.value());
Branch(IsJSReceiverInstanceType(value_instance_type), &out, &throw_exception);
// The {value} is not a compatible receiver for this method.
BIND(&throw_exception);
ThrowTypeError(context, msg_template, method_name);
BIND(&out);
return var_value_map.value();
}
Node* PromiseBuiltinsAssembler::PromiseHasHandler(Node* promise) {
Node* const flags = LoadObjectField(promise, JSPromise::kFlagsOffset);
return IsSetWord(SmiUntag(flags), 1 << JSPromise::kHasHandlerBit);
}
void PromiseBuiltinsAssembler::PromiseSetHasHandler(Node* promise) {
Node* const flags = LoadObjectField(promise, JSPromise::kFlagsOffset);
Node* const new_flags =
SmiOr(flags, SmiConstant(1 << JSPromise::kHasHandlerBit));
StoreObjectFieldNoWriteBarrier(promise, JSPromise::kFlagsOffset, new_flags);
}
void PromiseBuiltinsAssembler::PromiseSetHandledHint(Node* promise) {
Node* const flags = LoadObjectField(promise, JSPromise::kFlagsOffset);
Node* const new_flags =
SmiOr(flags, SmiConstant(1 << JSPromise::kHandledHintBit));
StoreObjectFieldNoWriteBarrier(promise, JSPromise::kFlagsOffset, new_flags);
}
Node* PromiseBuiltinsAssembler::SpeciesConstructor(Node* context, Node* object,
Node* default_constructor) {
Isolate* isolate = this->isolate();
VARIABLE(var_result, MachineRepresentation::kTagged);
var_result.Bind(default_constructor);
// 2. Let C be ? Get(O, "constructor").
Node* const constructor =
GetProperty(context, object, isolate->factory()->constructor_string());
// 3. If C is undefined, return defaultConstructor.
Label out(this);
GotoIf(IsUndefined(constructor), &out);
// 4. If Type(C) is not Object, throw a TypeError exception.
ThrowIfNotJSReceiver(context, constructor,
MessageTemplate::kConstructorNotReceiver);
// 5. Let S be ? Get(C, @@species).
Node* const species =
GetProperty(context, constructor, isolate->factory()->species_symbol());
// 6. If S is either undefined or null, return defaultConstructor.
GotoIf(IsUndefined(species), &out);
GotoIf(WordEqual(species, NullConstant()), &out);
// 7. If IsConstructor(S) is true, return S.
Label throw_error(this);
GotoIf(TaggedIsSmi(species), &throw_error);
GotoIfNot(IsConstructorMap(LoadMap(species)), &throw_error);
var_result.Bind(species);
Goto(&out);
// 8. Throw a TypeError exception.
BIND(&throw_error);
ThrowTypeError(context, MessageTemplate::kSpeciesNotConstructor);
BIND(&out);
return var_result.value();
}
void PromiseBuiltinsAssembler::AppendPromiseCallback(int offset, Node* promise,
Node* value) {
Node* elements = LoadObjectField(promise, offset);
Node* length = LoadFixedArrayBaseLength(elements);
CodeStubAssembler::ParameterMode mode = OptimalParameterMode();
length = TaggedToParameter(length, mode);
Node* delta = IntPtrOrSmiConstant(1, mode);
Node* new_capacity = IntPtrOrSmiAdd(length, delta, mode);
const ElementsKind kind = PACKED_ELEMENTS;
const WriteBarrierMode barrier_mode = UPDATE_WRITE_BARRIER;
const CodeStubAssembler::AllocationFlags flags =
CodeStubAssembler::kAllowLargeObjectAllocation;
int additional_offset = 0;
Node* new_elements = AllocateFixedArray(kind, new_capacity, mode, flags);
CopyFixedArrayElements(kind, elements, new_elements, length, barrier_mode,
mode);
StoreFixedArrayElement(new_elements, length, value, barrier_mode,
additional_offset, mode);
StoreObjectField(promise, offset, new_elements);
}
Node* PromiseBuiltinsAssembler::InternalPromiseThen(Node* context,
Node* promise,
Node* on_resolve,
Node* on_reject) {
Isolate* isolate = this->isolate();
// 2. If IsPromise(promise) is false, throw a TypeError exception.
ThrowIfNotInstanceType(context, promise, JS_PROMISE_TYPE,
"Promise.prototype.then");
Node* const native_context = LoadNativeContext(context);
Node* const promise_fun =
LoadContextElement(native_context, Context::PROMISE_FUNCTION_INDEX);
// 3. Let C be ? SpeciesConstructor(promise, %Promise%).
Node* constructor = SpeciesConstructor(context, promise, promise_fun);
// 4. Let resultCapability be ? NewPromiseCapability(C).
Callable call_callable = CodeFactory::Call(isolate);
Label fast_promise_capability(this), promise_capability(this),
perform_promise_then(this);
VARIABLE(var_deferred_promise, MachineRepresentation::kTagged);
VARIABLE(var_deferred_on_resolve, MachineRepresentation::kTagged);
VARIABLE(var_deferred_on_reject, MachineRepresentation::kTagged);
Branch(WordEqual(promise_fun, constructor), &fast_promise_capability,
&promise_capability);
BIND(&fast_promise_capability);
{
Node* const deferred_promise = AllocateAndInitJSPromise(context, promise);
var_deferred_promise.Bind(deferred_promise);
var_deferred_on_resolve.Bind(UndefinedConstant());
var_deferred_on_reject.Bind(UndefinedConstant());
Goto(&perform_promise_then);
}
BIND(&promise_capability);
{
Node* const capability = NewPromiseCapability(context, constructor);
var_deferred_promise.Bind(
LoadObjectField(capability, JSPromiseCapability::kPromiseOffset));
var_deferred_on_resolve.Bind(
LoadObjectField(capability, JSPromiseCapability::kResolveOffset));
var_deferred_on_reject.Bind(
LoadObjectField(capability, JSPromiseCapability::kRejectOffset));
Goto(&perform_promise_then);
}
// 5. Return PerformPromiseThen(promise, onFulfilled, onRejected,
// resultCapability).
BIND(&perform_promise_then);
Node* const result = InternalPerformPromiseThen(
context, promise, on_resolve, on_reject, var_deferred_promise.value(),
var_deferred_on_resolve.value(), var_deferred_on_reject.value());
return result;
}
Node* PromiseBuiltinsAssembler::InternalPerformPromiseThen(
Node* context, Node* promise, Node* on_resolve, Node* on_reject,
Node* deferred_promise, Node* deferred_on_resolve,
Node* deferred_on_reject) {
VARIABLE(var_on_resolve, MachineRepresentation::kTagged);
VARIABLE(var_on_reject, MachineRepresentation::kTagged);
var_on_resolve.Bind(on_resolve);
var_on_reject.Bind(on_reject);
Label out(this), if_onresolvenotcallable(this), onrejectcheck(this),
append_callbacks(this);
GotoIf(TaggedIsSmi(on_resolve), &if_onresolvenotcallable);
Isolate* isolate = this->isolate();
Node* const on_resolve_map = LoadMap(on_resolve);
Branch(IsCallableMap(on_resolve_map), &onrejectcheck,
&if_onresolvenotcallable);
BIND(&if_onresolvenotcallable);
{
Node* const default_resolve_handler_symbol = HeapConstant(
isolate->factory()->promise_default_resolve_handler_symbol());
var_on_resolve.Bind(default_resolve_handler_symbol);
Goto(&onrejectcheck);
}
BIND(&onrejectcheck);
{
Label if_onrejectnotcallable(this);
GotoIf(TaggedIsSmi(on_reject), &if_onrejectnotcallable);
Node* const on_reject_map = LoadMap(on_reject);
Branch(IsCallableMap(on_reject_map), &append_callbacks,
&if_onrejectnotcallable);
BIND(&if_onrejectnotcallable);
{
Node* const default_reject_handler_symbol = HeapConstant(
isolate->factory()->promise_default_reject_handler_symbol());
var_on_reject.Bind(default_reject_handler_symbol);
Goto(&append_callbacks);
}
}
BIND(&append_callbacks);
{
Label fulfilled_check(this);
Node* const status = LoadObjectField(promise, JSPromise::kStatusOffset);
GotoIfNot(SmiEqual(status, SmiConstant(v8::Promise::kPending)),
&fulfilled_check);
Node* const existing_deferred_promise =
LoadObjectField(promise, JSPromise::kDeferredPromiseOffset);
Label if_noexistingcallbacks(this), if_existingcallbacks(this);
Branch(IsUndefined(existing_deferred_promise), &if_noexistingcallbacks,
&if_existingcallbacks);
BIND(&if_noexistingcallbacks);
{
// Store callbacks directly in the slots.
StoreObjectField(promise, JSPromise::kDeferredPromiseOffset,
deferred_promise);
StoreObjectField(promise, JSPromise::kDeferredOnResolveOffset,
deferred_on_resolve);
StoreObjectField(promise, JSPromise::kDeferredOnRejectOffset,
deferred_on_reject);
StoreObjectField(promise, JSPromise::kFulfillReactionsOffset,
var_on_resolve.value());
StoreObjectField(promise, JSPromise::kRejectReactionsOffset,
var_on_reject.value());
Goto(&out);
}
BIND(&if_existingcallbacks);
{
Label if_singlecallback(this), if_multiplecallbacks(this);
BranchIfJSObject(existing_deferred_promise, &if_singlecallback,
&if_multiplecallbacks);
BIND(&if_singlecallback);
{
// Create new FixedArrays to store callbacks, and migrate
// existing callbacks.
Node* const deferred_promise_arr =
AllocateFixedArray(PACKED_ELEMENTS, IntPtrConstant(2));
StoreFixedArrayElement(deferred_promise_arr, 0,
existing_deferred_promise);
StoreFixedArrayElement(deferred_promise_arr, 1, deferred_promise);
Node* const deferred_on_resolve_arr =
AllocateFixedArray(PACKED_ELEMENTS, IntPtrConstant(2));
StoreFixedArrayElement(
deferred_on_resolve_arr, 0,
LoadObjectField(promise, JSPromise::kDeferredOnResolveOffset));
StoreFixedArrayElement(deferred_on_resolve_arr, 1, deferred_on_resolve);
Node* const deferred_on_reject_arr =
AllocateFixedArray(PACKED_ELEMENTS, IntPtrConstant(2));
StoreFixedArrayElement(
deferred_on_reject_arr, 0,
LoadObjectField(promise, JSPromise::kDeferredOnRejectOffset));
StoreFixedArrayElement(deferred_on_reject_arr, 1, deferred_on_reject);
Node* const fulfill_reactions =
AllocateFixedArray(PACKED_ELEMENTS, IntPtrConstant(2));
StoreFixedArrayElement(
fulfill_reactions, 0,
LoadObjectField(promise, JSPromise::kFulfillReactionsOffset));
StoreFixedArrayElement(fulfill_reactions, 1, var_on_resolve.value());
Node* const reject_reactions =
AllocateFixedArray(PACKED_ELEMENTS, IntPtrConstant(2));
StoreFixedArrayElement(
reject_reactions, 0,
LoadObjectField(promise, JSPromise::kRejectReactionsOffset));
StoreFixedArrayElement(reject_reactions, 1, var_on_reject.value());
// Store new FixedArrays in promise.
StoreObjectField(promise, JSPromise::kDeferredPromiseOffset,
deferred_promise_arr);
StoreObjectField(promise, JSPromise::kDeferredOnResolveOffset,
deferred_on_resolve_arr);
StoreObjectField(promise, JSPromise::kDeferredOnRejectOffset,
deferred_on_reject_arr);
StoreObjectField(promise, JSPromise::kFulfillReactionsOffset,
fulfill_reactions);
StoreObjectField(promise, JSPromise::kRejectReactionsOffset,
reject_reactions);
Goto(&out);
}
BIND(&if_multiplecallbacks);
{
AppendPromiseCallback(JSPromise::kDeferredPromiseOffset, promise,
deferred_promise);
AppendPromiseCallback(JSPromise::kDeferredOnResolveOffset, promise,
deferred_on_resolve);
AppendPromiseCallback(JSPromise::kDeferredOnRejectOffset, promise,
deferred_on_reject);
AppendPromiseCallback(JSPromise::kFulfillReactionsOffset, promise,
var_on_resolve.value());
AppendPromiseCallback(JSPromise::kRejectReactionsOffset, promise,
var_on_reject.value());
Goto(&out);
}
}
BIND(&fulfilled_check);
{
Label reject(this);
Node* const result = LoadObjectField(promise, JSPromise::kResultOffset);
GotoIfNot(WordEqual(status, SmiConstant(v8::Promise::kFulfilled)),
&reject);
Node* info = AllocatePromiseReactionJobInfo(
result, var_on_resolve.value(), deferred_promise, deferred_on_resolve,
deferred_on_reject, context);
// TODO(gsathya): Move this to TF
CallRuntime(Runtime::kEnqueuePromiseReactionJob, context, info);
Goto(&out);
BIND(&reject);
{
Node* const has_handler = PromiseHasHandler(promise);
Label enqueue(this);
// TODO(gsathya): Fold these runtime calls and move to TF.
GotoIf(has_handler, &enqueue);
CallRuntime(Runtime::kPromiseRevokeReject, context, promise);
Goto(&enqueue);
BIND(&enqueue);
{
Node* info = AllocatePromiseReactionJobInfo(
result, var_on_reject.value(), deferred_promise,
deferred_on_resolve, deferred_on_reject, context);
// TODO(gsathya): Move this to TF
CallRuntime(Runtime::kEnqueuePromiseReactionJob, context, info);
Goto(&out);
}
}
}
}
BIND(&out);
PromiseSetHasHandler(promise);
return deferred_promise;
}
// Promise fast path implementations rely on unmodified JSPromise instances.
// We use a fairly coarse granularity for this and simply check whether both
// the promise itself is unmodified (i.e. its map has not changed) and its
// prototype is unmodified.
// TODO(gsathya): Refactor this out to prevent code dupe with builtins-regexp
void PromiseBuiltinsAssembler::BranchIfFastPath(Node* context, Node* promise,
Label* if_isunmodified,
Label* if_ismodified) {
Node* const native_context = LoadNativeContext(context);
Node* const promise_fun =
LoadContextElement(native_context, Context::PROMISE_FUNCTION_INDEX);
BranchIfFastPath(native_context, promise_fun, promise, if_isunmodified,
if_ismodified);
}
void PromiseBuiltinsAssembler::BranchIfFastPath(Node* native_context,
Node* promise_fun,
Node* promise,
Label* if_isunmodified,
Label* if_ismodified) {
CSA_ASSERT(this, IsNativeContext(native_context));
CSA_ASSERT(this,
WordEqual(promise_fun,
LoadContextElement(native_context,
Context::PROMISE_FUNCTION_INDEX)));
Node* const map = LoadMap(promise);
Node* const initial_map =
LoadObjectField(promise_fun, JSFunction::kPrototypeOrInitialMapOffset);
Node* const has_initialmap = WordEqual(map, initial_map);
GotoIfNot(has_initialmap, if_ismodified);
Node* const initial_proto_initial_map =
LoadContextElement(native_context, Context::PROMISE_PROTOTYPE_MAP_INDEX);
Node* const proto_map = LoadMap(LoadMapPrototype(map));
Node* const proto_has_initialmap =
WordEqual(proto_map, initial_proto_initial_map);
Branch(proto_has_initialmap, if_isunmodified, if_ismodified);
}
Node* PromiseBuiltinsAssembler::AllocatePromiseResolveThenableJobInfo(
Node* thenable, Node* then, Node* resolve, Node* reject, Node* context) {
Node* const info = Allocate(PromiseResolveThenableJobInfo::kSize);
StoreMapNoWriteBarrier(info,
Heap::kPromiseResolveThenableJobInfoMapRootIndex);
StoreObjectFieldNoWriteBarrier(
info, PromiseResolveThenableJobInfo::kThenableOffset, thenable);
StoreObjectFieldNoWriteBarrier(
info, PromiseResolveThenableJobInfo::kThenOffset, then);
StoreObjectFieldNoWriteBarrier(
info, PromiseResolveThenableJobInfo::kResolveOffset, resolve);
StoreObjectFieldNoWriteBarrier(
info, PromiseResolveThenableJobInfo::kRejectOffset, reject);
StoreObjectFieldNoWriteBarrier(
info, PromiseResolveThenableJobInfo::kContextOffset, context);
return info;
}
void PromiseBuiltinsAssembler::InternalResolvePromise(Node* context,
Node* promise,
Node* result) {
Isolate* isolate = this->isolate();
VARIABLE(var_reason, MachineRepresentation::kTagged);
VARIABLE(var_then, MachineRepresentation::kTagged);
Label do_enqueue(this), fulfill(this), if_cycle(this, Label::kDeferred),
if_rejectpromise(this, Label::kDeferred), out(this);
Label cycle_check(this);
GotoIfNot(IsPromiseHookEnabledOrDebugIsActive(), &cycle_check);
CallRuntime(Runtime::kPromiseHookResolve, context, promise);
Goto(&cycle_check);
BIND(&cycle_check);
// 6. If SameValue(resolution, promise) is true, then
GotoIf(SameValue(promise, result), &if_cycle);
// 7. If Type(resolution) is not Object, then
GotoIf(TaggedIsSmi(result), &fulfill);
GotoIfNot(IsJSReceiver(result), &fulfill);
Label if_nativepromise(this), if_notnativepromise(this, Label::kDeferred);
Node* const native_context = LoadNativeContext(context);
Node* const promise_fun =
LoadContextElement(native_context, Context::PROMISE_FUNCTION_INDEX);
BranchIfFastPath(native_context, promise_fun, result, &if_nativepromise,
&if_notnativepromise);
// Resolution is a native promise and if it's already resolved or
// rejected, shortcircuit the resolution procedure by directly
// reusing the value from the promise.
BIND(&if_nativepromise);
{
Node* const thenable_status =
LoadObjectField(result, JSPromise::kStatusOffset);
Node* const thenable_value =
LoadObjectField(result, JSPromise::kResultOffset);
Label if_isnotpending(this);
GotoIfNot(SmiEqual(SmiConstant(v8::Promise::kPending), thenable_status),
&if_isnotpending);
// TODO(gsathya): Use a marker here instead of the actual then
// callback, and check for the marker in PromiseResolveThenableJob
// and perform PromiseThen.
Node* const then =
LoadContextElement(native_context, Context::PROMISE_THEN_INDEX);
var_then.Bind(then);
Goto(&do_enqueue);
BIND(&if_isnotpending);
{
Label if_fulfilled(this), if_rejected(this);
Branch(SmiEqual(SmiConstant(v8::Promise::kFulfilled), thenable_status),
&if_fulfilled, &if_rejected);
BIND(&if_fulfilled);
{
PromiseFulfill(context, promise, thenable_value,
v8::Promise::kFulfilled);
PromiseSetHasHandler(promise);
Goto(&out);
}
BIND(&if_rejected);
{
Label reject(this);
Node* const has_handler = PromiseHasHandler(result);
// Promise has already been rejected, but had no handler.
// Revoke previously triggered reject event.
GotoIf(has_handler, &reject);
CallRuntime(Runtime::kPromiseRevokeReject, context, result);
Goto(&reject);
BIND(&reject);
// Don't cause a debug event as this case is forwarding a rejection.
InternalPromiseReject(context, promise, thenable_value, false);
PromiseSetHasHandler(result);
Goto(&out);
}
}
}
BIND(&if_notnativepromise);
{
// 8. Let then be Get(resolution, "then").
Node* const then =
GetProperty(context, result, isolate->factory()->then_string());
// 9. If then is an abrupt completion, then
GotoIfException(then, &if_rejectpromise, &var_reason);
// 11. If IsCallable(thenAction) is false, then
GotoIf(TaggedIsSmi(then), &fulfill);
Node* const then_map = LoadMap(then);
GotoIfNot(IsCallableMap(then_map), &fulfill);
var_then.Bind(then);
Goto(&do_enqueue);
}
BIND(&do_enqueue);
{
// TODO(gsathya): Add fast path for native promises with unmodified
// PromiseThen (which don't need these resolving functions, but
// instead can just call resolve/reject directly).
Node* resolve = nullptr;
Node* reject = nullptr;
std::tie(resolve, reject) = CreatePromiseResolvingFunctions(
promise, FalseConstant(), native_context);
Node* const info = AllocatePromiseResolveThenableJobInfo(
result, var_then.value(), resolve, reject, context);
Label enqueue(this);
GotoIfNot(IsDebugActive(), &enqueue);
GotoIf(TaggedIsSmi(result), &enqueue);
GotoIfNot(HasInstanceType(result, JS_PROMISE_TYPE), &enqueue);
// Mark the dependency of the new promise on the resolution
Node* const key =
HeapConstant(isolate->factory()->promise_handled_by_symbol());
CallRuntime(Runtime::kSetProperty, context, result, key, promise,
SmiConstant(STRICT));
Goto(&enqueue);
// 12. Perform EnqueueJob("PromiseJobs",
// PromiseResolveThenableJob, « promise, resolution, thenAction»).
BIND(&enqueue);
// TODO(gsathya): Move this to TF
CallRuntime(Runtime::kEnqueuePromiseResolveThenableJob, context, info);
Goto(&out);
}
// 7.b Return FulfillPromise(promise, resolution).
BIND(&fulfill);
{
PromiseFulfill(context, promise, result, v8::Promise::kFulfilled);
Goto(&out);
}
BIND(&if_cycle);
{
// 6.a Let selfResolutionError be a newly created TypeError object.
Node* const message_id = SmiConstant(MessageTemplate::kPromiseCyclic);
Node* const error =
CallRuntime(Runtime::kNewTypeError, context, message_id, result);
var_reason.Bind(error);
// 6.b Return RejectPromise(promise, selfResolutionError).
Goto(&if_rejectpromise);
}
// 9.a Return RejectPromise(promise, then.[[Value]]).
BIND(&if_rejectpromise);
{
// Don't cause a debug event as this case is forwarding a rejection.
InternalPromiseReject(context, promise, var_reason.value(), false);
Goto(&out);
}
BIND(&out);
}
void PromiseBuiltinsAssembler::PromiseFulfill(
Node* context, Node* promise, Node* result,
v8::Promise::PromiseState status) {
Label do_promisereset(this), debug_async_event_enqueue_recurring(this);
Node* const status_smi = SmiConstant(static_cast<int>(status));
Node* const deferred_promise =
LoadObjectField(promise, JSPromise::kDeferredPromiseOffset);
GotoIf(IsUndefined(deferred_promise), &debug_async_event_enqueue_recurring);
Node* const tasks =
status == v8::Promise::kFulfilled
? LoadObjectField(promise, JSPromise::kFulfillReactionsOffset)
: LoadObjectField(promise, JSPromise::kRejectReactionsOffset);
Node* const deferred_on_resolve =
LoadObjectField(promise, JSPromise::kDeferredOnResolveOffset);
Node* const deferred_on_reject =
LoadObjectField(promise, JSPromise::kDeferredOnRejectOffset);
Node* const info = AllocatePromiseReactionJobInfo(
result, tasks, deferred_promise, deferred_on_resolve, deferred_on_reject,
context);
CallRuntime(Runtime::kEnqueuePromiseReactionJob, context, info);
Goto(&debug_async_event_enqueue_recurring);
BIND(&debug_async_event_enqueue_recurring);
{
GotoIfNot(IsDebugActive(), &do_promisereset);
CallRuntime(Runtime::kDebugAsyncEventEnqueueRecurring, context, promise,
status_smi);
Goto(&do_promisereset);
}
BIND(&do_promisereset);
{
StoreObjectField(promise, JSPromise::kStatusOffset, status_smi);
StoreObjectField(promise, JSPromise::kResultOffset, result);
StoreObjectFieldRoot(promise, JSPromise::kDeferredPromiseOffset,
Heap::kUndefinedValueRootIndex);
StoreObjectFieldRoot(promise, JSPromise::kDeferredOnResolveOffset,
Heap::kUndefinedValueRootIndex);
StoreObjectFieldRoot(promise, JSPromise::kDeferredOnRejectOffset,
Heap::kUndefinedValueRootIndex);
StoreObjectFieldRoot(promise, JSPromise::kFulfillReactionsOffset,
Heap::kUndefinedValueRootIndex);
StoreObjectFieldRoot(promise, JSPromise::kRejectReactionsOffset,
Heap::kUndefinedValueRootIndex);
}
}
void PromiseBuiltinsAssembler::BranchIfAccessCheckFailed(
Node* context, Node* native_context, Node* promise_constructor,
Node* executor, Label* if_noaccess) {
VARIABLE(var_executor, MachineRepresentation::kTagged);
var_executor.Bind(executor);
Label has_access(this), call_runtime(this, Label::kDeferred);
// If executor is a bound function, load the bound function until we've
// reached an actual function.
Label found_function(this), loop_over_bound_function(this, &var_executor);
Goto(&loop_over_bound_function);
BIND(&loop_over_bound_function);
{
Node* executor_type = LoadInstanceType(var_executor.value());
GotoIf(InstanceTypeEqual(executor_type, JS_FUNCTION_TYPE), &found_function);
GotoIfNot(InstanceTypeEqual(executor_type, JS_BOUND_FUNCTION_TYPE),
&call_runtime);
var_executor.Bind(LoadObjectField(
var_executor.value(), JSBoundFunction::kBoundTargetFunctionOffset));
Goto(&loop_over_bound_function);
}
// Load the context from the function and compare it to the Promise
// constructor's context. If they match, everything is fine, otherwise, bail
// out to the runtime.
BIND(&found_function);
{
Node* function_context =
LoadObjectField(var_executor.value(), JSFunction::kContextOffset);
Node* native_function_context = LoadNativeContext(function_context);
Branch(WordEqual(native_context, native_function_context), &has_access,
&call_runtime);
}
BIND(&call_runtime);
{
Branch(WordEqual(CallRuntime(Runtime::kAllowDynamicFunction, context,
promise_constructor),
BooleanConstant(true)),
&has_access, if_noaccess);
}
BIND(&has_access);
}
void PromiseBuiltinsAssembler::InternalPromiseReject(Node* context,
Node* promise, Node* value,
Node* debug_event) {
Label out(this);
GotoIfNot(IsDebugActive(), &out);
GotoIfNot(WordEqual(TrueConstant(), debug_event), &out);
CallRuntime(Runtime::kDebugPromiseReject, context, promise, value);
Goto(&out);
BIND(&out);
InternalPromiseReject(context, promise, value, false);
}
// This duplicates a lot of logic from PromiseRejectEvent in
// runtime-promise.cc
void PromiseBuiltinsAssembler::InternalPromiseReject(Node* context,
Node* promise, Node* value,
bool debug_event) {
Label fulfill(this), report_unhandledpromise(this), run_promise_hook(this);
if (debug_event) {
GotoIfNot(IsDebugActive(), &run_promise_hook);
CallRuntime(Runtime::kDebugPromiseReject, context, promise, value);
Goto(&run_promise_hook);
} else {
Goto(&run_promise_hook);
}
BIND(&run_promise_hook);
{
GotoIfNot(IsPromiseHookEnabledOrDebugIsActive(), &report_unhandledpromise);
CallRuntime(Runtime::kPromiseHookResolve, context, promise);
Goto(&report_unhandledpromise);
}
BIND(&report_unhandledpromise);
{
GotoIf(PromiseHasHandler(promise), &fulfill);
CallRuntime(Runtime::kReportPromiseReject, context, promise, value);
Goto(&fulfill);
}
BIND(&fulfill);
PromiseFulfill(context, promise, value, v8::Promise::kRejected);
}
void PromiseBuiltinsAssembler::SetForwardingHandlerIfTrue(
Node* context, Node* condition, const NodeGenerator& object) {
Label done(this);
GotoIfNot(condition, &done);
CallRuntime(Runtime::kSetProperty, context, object(),
HeapConstant(factory()->promise_forwarding_handler_symbol()),
TrueConstant(), SmiConstant(STRICT));
Goto(&done);
BIND(&done);
}
void PromiseBuiltinsAssembler::SetPromiseHandledByIfTrue(
Node* context, Node* condition, Node* promise,
const NodeGenerator& handled_by) {
Label done(this);
GotoIfNot(condition, &done);
GotoIf(TaggedIsSmi(promise), &done);
GotoIfNot(HasInstanceType(promise, JS_PROMISE_TYPE), &done);
CallRuntime(Runtime::kSetProperty, context, promise,
HeapConstant(factory()->promise_handled_by_symbol()),
handled_by(), SmiConstant(STRICT));
Goto(&done);