src/interpreter/interpreter-intrinsics.cc - v8/v8 - Git at Google

 // 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/interpreter/interpreter-intrinsics.h"

 #include "src/code-factory.h"
 #include "src/objects-inl.h"

 namespace v8 {
 namespace internal {
 namespace interpreter {

 using compiler::Node;

 #define __ assembler_->

 IntrinsicsHelper::IntrinsicsHelper(InterpreterAssembler* assembler)
     : isolate_(assembler->isolate()),
       zone_(assembler->zone()),
       assembler_(assembler) {}

 // static
 bool IntrinsicsHelper::IsSupported(Runtime::FunctionId function_id) {
   switch (function_id) {
 #define SUPPORTED(name, lower_case, count) case Runtime::kInline##name:
     INTRINSICS_LIST(SUPPORTED)
     return true;
 #undef SUPPORTED
     default:
       return false;
   }
 }

 // static
 IntrinsicsHelper::IntrinsicId IntrinsicsHelper::FromRuntimeId(
     Runtime::FunctionId function_id) {
   switch (function_id) {
 #define TO_RUNTIME_ID(name, lower_case, count) \
   case Runtime::kInline##name:                 \
     return IntrinsicId::k##name;
     INTRINSICS_LIST(TO_RUNTIME_ID)
 #undef TO_RUNTIME_ID
     default:
       UNREACHABLE();
       return static_cast<IntrinsicsHelper::IntrinsicId>(-1);
   }
 }

 // static
 Runtime::FunctionId IntrinsicsHelper::ToRuntimeId(
     IntrinsicsHelper::IntrinsicId intrinsic_id) {
   switch (intrinsic_id) {
 #define TO_INTRINSIC_ID(name, lower_case, count) \
   case IntrinsicId::k##name:                     \
     return Runtime::kInline##name;
     INTRINSICS_LIST(TO_INTRINSIC_ID)
 #undef TO_INTRINSIC_ID
     default:
       UNREACHABLE();
       return static_cast<Runtime::FunctionId>(-1);
   }
 }

 Node* IntrinsicsHelper::InvokeIntrinsic(Node* function_id, Node* context,
                                         Node* first_arg_reg, Node* arg_count) {
   InterpreterAssembler::Label abort(assembler_), end(assembler_);
   InterpreterAssembler::Variable result(assembler_,
                                         MachineRepresentation::kTagged);

 #define MAKE_LABEL(name, lower_case, count) \
   InterpreterAssembler::Label lower_case(assembler_);
   INTRINSICS_LIST(MAKE_LABEL)
 #undef MAKE_LABEL

 #define LABEL_POINTER(name, lower_case, count) &lower_case,
   InterpreterAssembler::Label* labels[] = {INTRINSICS_LIST(LABEL_POINTER)};
 #undef LABEL_POINTER

 #define CASE(name, lower_case, count) \
   static_cast<int32_t>(IntrinsicId::k##name),
   int32_t cases[] = {INTRINSICS_LIST(CASE)};
 #undef CASE

   __ Switch(function_id, &abort, cases, labels, arraysize(cases));
 #define HANDLE_CASE(name, lower_case, expected_arg_count)   \
   __ Bind(&lower_case);                                     \
   if (FLAG_debug_code && expected_arg_count >= 0) {         \
     AbortIfArgCountMismatch(expected_arg_count, arg_count); \
   }                                                         \
   result.Bind(name(first_arg_reg, arg_count, context));     \
   __ Goto(&end);
   INTRINSICS_LIST(HANDLE_CASE)
 #undef HANDLE_CASE

   __ Bind(&abort);
   {
     __ Abort(BailoutReason::kUnexpectedFunctionIDForInvokeIntrinsic);
     result.Bind(__ UndefinedConstant());
     __ Goto(&end);
   }

   __ Bind(&end);
   return result.value();
 }

 Node* IntrinsicsHelper::CompareInstanceType(Node* object, int type,
                                             InstanceTypeCompareMode mode) {
   Node* instance_type = __ LoadInstanceType(object);

   if (mode == kInstanceTypeEqual) {
     return __ Word32Equal(instance_type, __ Int32Constant(type));
   } else {
     DCHECK(mode == kInstanceTypeGreaterThanOrEqual);
     return __ Int32GreaterThanOrEqual(instance_type, __ Int32Constant(type));
   }
 }

 Node* IntrinsicsHelper::IsInstanceType(Node* input, int type) {
   InterpreterAssembler::Variable return_value(assembler_,
                                               MachineRepresentation::kTagged);
   // TODO(ishell): Use Select here.
   InterpreterAssembler::Label if_not_smi(assembler_), return_true(assembler_),
       return_false(assembler_), end(assembler_);
   Node* arg = __ LoadRegister(input);
   __ GotoIf(__ TaggedIsSmi(arg), &return_false);

   Node* condition = CompareInstanceType(arg, type, kInstanceTypeEqual);
   __ Branch(condition, &return_true, &return_false);

   __ Bind(&return_true);
   {
     return_value.Bind(__ BooleanConstant(true));
     __ Goto(&end);
   }

   __ Bind(&return_false);
   {
     return_value.Bind(__ BooleanConstant(false));
     __ Goto(&end);
   }

   __ Bind(&end);
   return return_value.value();
 }

 Node* IntrinsicsHelper::IsJSReceiver(Node* input, Node* arg_count,
                                      Node* context) {
   // TODO(ishell): Use Select here.
   // TODO(ishell): Use CSA::IsJSReceiverInstanceType here.
   InterpreterAssembler::Variable return_value(assembler_,
                                               MachineRepresentation::kTagged);
   InterpreterAssembler::Label return_true(assembler_), return_false(assembler_),
       end(assembler_);

   Node* arg = __ LoadRegister(input);
   __ GotoIf(__ TaggedIsSmi(arg), &return_false);

   STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
   Node* condition = CompareInstanceType(arg, FIRST_JS_RECEIVER_TYPE,
                                         kInstanceTypeGreaterThanOrEqual);
   __ Branch(condition, &return_true, &return_false);

   __ Bind(&return_true);
   {
     return_value.Bind(__ BooleanConstant(true));
     __ Goto(&end);
   }

   __ Bind(&return_false);
   {
     return_value.Bind(__ BooleanConstant(false));
     __ Goto(&end);
   }

   __ Bind(&end);
   return return_value.value();
 }

 Node* IntrinsicsHelper::IsArray(Node* input, Node* arg_count, Node* context) {
   return IsInstanceType(input, JS_ARRAY_TYPE);
 }

 Node* IntrinsicsHelper::IsJSProxy(Node* input, Node* arg_count, Node* context) {
   return IsInstanceType(input, JS_PROXY_TYPE);
 }

 Node* IntrinsicsHelper::IsTypedArray(Node* input, Node* arg_count,
                                      Node* context) {
   return IsInstanceType(input, JS_TYPED_ARRAY_TYPE);
 }

 Node* IntrinsicsHelper::IsSmi(Node* input, Node* arg_count, Node* context) {
   // TODO(ishell): Use SelectBooleanConstant here.
   InterpreterAssembler::Variable return_value(assembler_,
                                               MachineRepresentation::kTagged);
   InterpreterAssembler::Label if_smi(assembler_), if_not_smi(assembler_),
       end(assembler_);

   Node* arg = __ LoadRegister(input);

   __ Branch(__ TaggedIsSmi(arg), &if_smi, &if_not_smi);
   __ Bind(&if_smi);
   {
     return_value.Bind(__ BooleanConstant(true));
     __ Goto(&end);
   }

   __ Bind(&if_not_smi);
   {
     return_value.Bind(__ BooleanConstant(false));
     __ Goto(&end);
   }

   __ Bind(&end);
   return return_value.value();
 }

 Node* IntrinsicsHelper::IntrinsicAsStubCall(Node* args_reg, Node* context,
                                             Callable const& callable) {
   int param_count = callable.descriptor().GetParameterCount();
   int input_count = param_count + 2;  // +2 for target and context
   Node** args = zone()->NewArray<Node*>(input_count);
   int index = 0;
   args[index++] = __ HeapConstant(callable.code());
   for (int i = 0; i < param_count; i++) {
     args[index++] = __ LoadRegister(args_reg);
     args_reg = __ NextRegister(args_reg);
   }
   args[index++] = context;
   return __ CallStubN(callable.descriptor(), 1, input_count, args);
 }

 Node* IntrinsicsHelper::CreateIterResultObject(Node* input, Node* arg_count,
                                                Node* context) {
   return IntrinsicAsStubCall(input, context,
                              CodeFactory::CreateIterResultObject(isolate()));
 }

 Node* IntrinsicsHelper::HasProperty(Node* input, Node* arg_count,
                                     Node* context) {
   return IntrinsicAsStubCall(input, context,
                              CodeFactory::HasProperty(isolate()));
 }

 Node* IntrinsicsHelper::SubString(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::SubString(isolate()));
 }

 Node* IntrinsicsHelper::ToString(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::ToString(isolate()));
 }

 Node* IntrinsicsHelper::ToLength(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::ToLength(isolate()));
 }

 Node* IntrinsicsHelper::ToInteger(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::ToInteger(isolate()));
 }

 Node* IntrinsicsHelper::ToNumber(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::ToNumber(isolate()));
 }

 Node* IntrinsicsHelper::ToObject(Node* input, Node* arg_count, Node* context) {
   return IntrinsicAsStubCall(input, context, CodeFactory::ToObject(isolate()));
 }

 Node* IntrinsicsHelper::Call(Node* args_reg, Node* arg_count, Node* context) {
   // First argument register contains the function target.
   Node* function = __ LoadRegister(args_reg);

   // Receiver is the second runtime call argument.
   Node* receiver_reg = __ NextRegister(args_reg);
   Node* receiver_arg = __ RegisterLocation(receiver_reg);

   // Subtract function and receiver from arg count.
   Node* function_and_receiver_count = __ Int32Constant(2);
   Node* target_args_count = __ Int32Sub(arg_count, function_and_receiver_count);

   if (FLAG_debug_code) {
     InterpreterAssembler::Label arg_count_positive(assembler_);
     Node* comparison = __ Int32LessThan(target_args_count, __ Int32Constant(0));
     __ GotoIfNot(comparison, &arg_count_positive);
     __ Abort(kWrongArgumentCountForInvokeIntrinsic);
     __ Goto(&arg_count_positive);
     __ Bind(&arg_count_positive);
   }

   Node* result = __ CallJS(function, context, receiver_arg, target_args_count,
                            TailCallMode::kDisallow);
   return result;
 }

 Node* IntrinsicsHelper::ClassOf(Node* args_reg, Node* arg_count,
                                 Node* context) {
   Node* value = __ LoadRegister(args_reg);
   return __ ClassOf(value);
 }

 Node* IntrinsicsHelper::CreateAsyncFromSyncIterator(Node* args_reg,
                                                     Node* arg_count,
                                                     Node* context) {
   InterpreterAssembler::Label not_receiver(
       assembler_, InterpreterAssembler::Label::kDeferred);
   InterpreterAssembler::Label done(assembler_);
   InterpreterAssembler::Variable return_value(assembler_,
                                               MachineRepresentation::kTagged);

   Node* sync_iterator = __ LoadRegister(args_reg);

   __ GotoIf(__ TaggedIsSmi(sync_iterator), &not_receiver);
   __ GotoIfNot(__ IsJSReceiver(sync_iterator), &not_receiver);

   Node* const native_context = __ LoadNativeContext(context);
   Node* const map = __ LoadContextElement(
       native_context, Context::ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX);
   Node* const iterator = __ AllocateJSObjectFromMap(map);

   __ StoreObjectFieldNoWriteBarrier(
       iterator, JSAsyncFromSyncIterator::kSyncIteratorOffset, sync_iterator);

   return_value.Bind(iterator);
   __ Goto(&done);

   __ Bind(&not_receiver);
   {
     return_value.Bind(
         __ CallRuntime(Runtime::kThrowSymbolIteratorInvalid, context));

     // Unreachable due to the Throw in runtime call.
     __ Goto(&done);
   }

   __ Bind(&done);
   return return_value.value();
 }

 void IntrinsicsHelper::AbortIfArgCountMismatch(int expected, Node* actual) {
   InterpreterAssembler::Label match(assembler_);
   Node* comparison = __ Word32Equal(actual, __ Int32Constant(expected));
   __ GotoIf(comparison, &match);
   __ Abort(kWrongArgumentCountForInvokeIntrinsic);
   __ Goto(&match);
   __ Bind(&match);
 }

 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
	// 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/interpreter/interpreter-intrinsics.h"

	#include "src/code-factory.h"
	#include "src/objects-inl.h"

	namespace v8 {
	namespace internal {
	namespace interpreter {

	using compiler::Node;

	#define __ assembler_->

	IntrinsicsHelper::IntrinsicsHelper(InterpreterAssembler* assembler)
	: isolate_(assembler->isolate()),
	zone_(assembler->zone()),
	assembler_(assembler) {}

	// static
	bool IntrinsicsHelper::IsSupported(Runtime::FunctionId function_id) {
	switch (function_id) {
	#define SUPPORTED(name, lower_case, count) case Runtime::kInline##name:
	INTRINSICS_LIST(SUPPORTED)
	return true;
	#undef SUPPORTED
	default:
	return false;
	}
	}

	// static
	IntrinsicsHelper::IntrinsicId IntrinsicsHelper::FromRuntimeId(
	Runtime::FunctionId function_id) {
	switch (function_id) {
	#define TO_RUNTIME_ID(name, lower_case, count) \
	case Runtime::kInline##name: \
	return IntrinsicId::k##name;
	INTRINSICS_LIST(TO_RUNTIME_ID)
	#undef TO_RUNTIME_ID
	default:
	UNREACHABLE();
	return static_cast<IntrinsicsHelper::IntrinsicId>(-1);
	}
	}

	// static
	Runtime::FunctionId IntrinsicsHelper::ToRuntimeId(
	IntrinsicsHelper::IntrinsicId intrinsic_id) {
	switch (intrinsic_id) {
	#define TO_INTRINSIC_ID(name, lower_case, count) \
	case IntrinsicId::k##name: \
	return Runtime::kInline##name;
	INTRINSICS_LIST(TO_INTRINSIC_ID)
	#undef TO_INTRINSIC_ID
	default:
	UNREACHABLE();
	return static_cast<Runtime::FunctionId>(-1);
	}
	}

	Node* IntrinsicsHelper::InvokeIntrinsic(Node* function_id, Node* context,
	Node* first_arg_reg, Node* arg_count) {
	InterpreterAssembler::Label abort(assembler_), end(assembler_);
	InterpreterAssembler::Variable result(assembler_,
	MachineRepresentation::kTagged);

	#define MAKE_LABEL(name, lower_case, count) \
	InterpreterAssembler::Label lower_case(assembler_);
	INTRINSICS_LIST(MAKE_LABEL)
	#undef MAKE_LABEL

	#define LABEL_POINTER(name, lower_case, count) &lower_case,
	InterpreterAssembler::Label* labels[] = {INTRINSICS_LIST(LABEL_POINTER)};
	#undef LABEL_POINTER

	#define CASE(name, lower_case, count) \
	static_cast<int32_t>(IntrinsicId::k##name),
	int32_t cases[] = {INTRINSICS_LIST(CASE)};
	#undef CASE

	__ Switch(function_id, &abort, cases, labels, arraysize(cases));
	#define HANDLE_CASE(name, lower_case, expected_arg_count) \
	__ Bind(&lower_case); \
	if (FLAG_debug_code && expected_arg_count >= 0) { \
	AbortIfArgCountMismatch(expected_arg_count, arg_count); \
	} \
	result.Bind(name(first_arg_reg, arg_count, context)); \
	__ Goto(&end);
	INTRINSICS_LIST(HANDLE_CASE)
	#undef HANDLE_CASE

	__ Bind(&abort);
	{
	__ Abort(BailoutReason::kUnexpectedFunctionIDForInvokeIntrinsic);
	result.Bind(__ UndefinedConstant());
	__ Goto(&end);
	}

	__ Bind(&end);
	return result.value();
	}

	Node* IntrinsicsHelper::CompareInstanceType(Node* object, int type,
	InstanceTypeCompareMode mode) {
	Node* instance_type = __ LoadInstanceType(object);

	if (mode == kInstanceTypeEqual) {
	return __ Word32Equal(instance_type, __ Int32Constant(type));
	} else {
	DCHECK(mode == kInstanceTypeGreaterThanOrEqual);
	return __ Int32GreaterThanOrEqual(instance_type, __ Int32Constant(type));
	}
	}

	Node* IntrinsicsHelper::IsInstanceType(Node* input, int type) {
	InterpreterAssembler::Variable return_value(assembler_,
	MachineRepresentation::kTagged);
	// TODO(ishell): Use Select here.
	InterpreterAssembler::Label if_not_smi(assembler_), return_true(assembler_),
	return_false(assembler_), end(assembler_);
	Node* arg = __ LoadRegister(input);
	__ GotoIf(__ TaggedIsSmi(arg), &return_false);

	Node* condition = CompareInstanceType(arg, type, kInstanceTypeEqual);
	__ Branch(condition, &return_true, &return_false);

	__ Bind(&return_true);
	{
	return_value.Bind(__ BooleanConstant(true));
	__ Goto(&end);
	}

	__ Bind(&return_false);
	{
	return_value.Bind(__ BooleanConstant(false));
	__ Goto(&end);
	}

	__ Bind(&end);
	return return_value.value();
	}

	Node* IntrinsicsHelper::IsJSReceiver(Node* input, Node* arg_count,
	Node* context) {
	// TODO(ishell): Use Select here.
	// TODO(ishell): Use CSA::IsJSReceiverInstanceType here.
	InterpreterAssembler::Variable return_value(assembler_,
	MachineRepresentation::kTagged);
	InterpreterAssembler::Label return_true(assembler_), return_false(assembler_),
	end(assembler_);

	Node* arg = __ LoadRegister(input);
	__ GotoIf(__ TaggedIsSmi(arg), &return_false);

	STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
	Node* condition = CompareInstanceType(arg, FIRST_JS_RECEIVER_TYPE,
	kInstanceTypeGreaterThanOrEqual);
	__ Branch(condition, &return_true, &return_false);

	__ Bind(&return_true);
	{
	return_value.Bind(__ BooleanConstant(true));
	__ Goto(&end);
	}

	__ Bind(&return_false);
	{
	return_value.Bind(__ BooleanConstant(false));
	__ Goto(&end);
	}

	__ Bind(&end);
	return return_value.value();
	}

	Node* IntrinsicsHelper::IsArray(Node* input, Node* arg_count, Node* context) {
	return IsInstanceType(input, JS_ARRAY_TYPE);
	}

	Node* IntrinsicsHelper::IsJSProxy(Node* input, Node* arg_count, Node* context) {
	return IsInstanceType(input, JS_PROXY_TYPE);
	}

	Node* IntrinsicsHelper::IsTypedArray(Node* input, Node* arg_count,
	Node* context) {
	return IsInstanceType(input, JS_TYPED_ARRAY_TYPE);
	}

	Node* IntrinsicsHelper::IsSmi(Node* input, Node* arg_count, Node* context) {
	// TODO(ishell): Use SelectBooleanConstant here.
	InterpreterAssembler::Variable return_value(assembler_,
	MachineRepresentation::kTagged);
	InterpreterAssembler::Label if_smi(assembler_), if_not_smi(assembler_),
	end(assembler_);

	Node* arg = __ LoadRegister(input);

	__ Branch(__ TaggedIsSmi(arg), &if_smi, &if_not_smi);
	__ Bind(&if_smi);
	{
	return_value.Bind(__ BooleanConstant(true));
	__ Goto(&end);
	}

	__ Bind(&if_not_smi);
	{
	return_value.Bind(__ BooleanConstant(false));
	__ Goto(&end);
	}

	__ Bind(&end);
	return return_value.value();
	}

	Node* IntrinsicsHelper::IntrinsicAsStubCall(Node* args_reg, Node* context,
	Callable const& callable) {
	int param_count = callable.descriptor().GetParameterCount();
	int input_count = param_count + 2; // +2 for target and context
	Node** args = zone()->NewArray<Node*>(input_count);
	int index = 0;
	args[index++] = __ HeapConstant(callable.code());
	for (int i = 0; i < param_count; i++) {
	args[index++] = __ LoadRegister(args_reg);
	args_reg = __ NextRegister(args_reg);
	}
	args[index++] = context;
	return __ CallStubN(callable.descriptor(), 1, input_count, args);
	}

	Node* IntrinsicsHelper::CreateIterResultObject(Node* input, Node* arg_count,
	Node* context) {
	return IntrinsicAsStubCall(input, context,
	CodeFactory::CreateIterResultObject(isolate()));
	}

	Node* IntrinsicsHelper::HasProperty(Node* input, Node* arg_count,
	Node* context) {
	return IntrinsicAsStubCall(input, context,
	CodeFactory::HasProperty(isolate()));
	}

	Node* IntrinsicsHelper::SubString(Node* input, Node* arg_count, Node* context) {
	return IntrinsicAsStubCall(input, context, CodeFactory::SubString(isolate()));
	}

	Node* IntrinsicsHelper::ToString(Node* input, Node* arg_count, Node* context) {
	return IntrinsicAsStubCall(input, context, CodeFactory::ToString(isolate()));
	}

	Node* IntrinsicsHelper::ToLength(Node* input, Node* arg_count, Node* context) {
	return IntrinsicAsStubCall(input, context, CodeFactory::ToLength(isolate()));
	}

	Node* IntrinsicsHelper::ToInteger(Node* input, Node* arg_count, Node* context) {
	return IntrinsicAsStubCall(input, context, CodeFactory::ToInteger(isolate()));
	}

	Node* IntrinsicsHelper::ToNumber(Node* input, Node* arg_count, Node* context) {
	return IntrinsicAsStubCall(input, context, CodeFactory::ToNumber(isolate()));
	}

	Node* IntrinsicsHelper::ToObject(Node* input, Node* arg_count, Node* context) {
	return IntrinsicAsStubCall(input, context, CodeFactory::ToObject(isolate()));
	}

	Node* IntrinsicsHelper::Call(Node* args_reg, Node* arg_count, Node* context) {
	// First argument register contains the function target.
	Node* function = __ LoadRegister(args_reg);

	// Receiver is the second runtime call argument.
	Node* receiver_reg = __ NextRegister(args_reg);
	Node* receiver_arg = __ RegisterLocation(receiver_reg);

	// Subtract function and receiver from arg count.
	Node* function_and_receiver_count = __ Int32Constant(2);
	Node* target_args_count = __ Int32Sub(arg_count, function_and_receiver_count);

	if (FLAG_debug_code) {
	InterpreterAssembler::Label arg_count_positive(assembler_);
	Node* comparison = __ Int32LessThan(target_args_count, __ Int32Constant(0));
	__ GotoIfNot(comparison, &arg_count_positive);
	__ Abort(kWrongArgumentCountForInvokeIntrinsic);
	__ Goto(&arg_count_positive);
	__ Bind(&arg_count_positive);
	}

	Node* result = __ CallJS(function, context, receiver_arg, target_args_count,
	TailCallMode::kDisallow);
	return result;
	}

	Node* IntrinsicsHelper::ClassOf(Node* args_reg, Node* arg_count,
	Node* context) {
	Node* value = __ LoadRegister(args_reg);
	return __ ClassOf(value);
	}

	Node* IntrinsicsHelper::CreateAsyncFromSyncIterator(Node* args_reg,
	Node* arg_count,
	Node* context) {
	InterpreterAssembler::Label not_receiver(
	assembler_, InterpreterAssembler::Label::kDeferred);
	InterpreterAssembler::Label done(assembler_);
	InterpreterAssembler::Variable return_value(assembler_,
	MachineRepresentation::kTagged);

	Node* sync_iterator = __ LoadRegister(args_reg);

	__ GotoIf(__ TaggedIsSmi(sync_iterator), &not_receiver);
	__ GotoIfNot(__ IsJSReceiver(sync_iterator), &not_receiver);

	Node* const native_context = __ LoadNativeContext(context);
	Node* const map = __ LoadContextElement(
	native_context, Context::ASYNC_FROM_SYNC_ITERATOR_MAP_INDEX);
	Node* const iterator = __ AllocateJSObjectFromMap(map);

	__ StoreObjectFieldNoWriteBarrier(
	iterator, JSAsyncFromSyncIterator::kSyncIteratorOffset, sync_iterator);

	return_value.Bind(iterator);
	__ Goto(&done);

	__ Bind(&not_receiver);
	{
	return_value.Bind(
	__ CallRuntime(Runtime::kThrowSymbolIteratorInvalid, context));

	// Unreachable due to the Throw in runtime call.
	__ Goto(&done);
	}

	__ Bind(&done);
	return return_value.value();
	}

	void IntrinsicsHelper::AbortIfArgCountMismatch(int expected, Node* actual) {
	InterpreterAssembler::Label match(assembler_);
	Node* comparison = __ Word32Equal(actual, __ Int32Constant(expected));
	__ GotoIf(comparison, &match);
	__ Abort(kWrongArgumentCountForInvokeIntrinsic);
	__ Goto(&match);
	__ Bind(&match);
	}

	} // namespace interpreter
	} // namespace internal
	} // namespace v8