Source/JavaScriptCore/runtime/AtomicsObject.cpp - external/github.com/WebKit/webkit - Git at Google

 /*
  * Copyright (C) 2016-2017 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "AtomicsObject.h"

 #include "FrameTracers.h"
 #include "JSCInlines.h"
 #include "JSTypedArrays.h"
 #include "ObjectPrototype.h"
 #include "ReleaseHeapAccessScope.h"
 #include "TypedArrayController.h"

 namespace JSC {

 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(AtomicsObject);

 #define FOR_EACH_ATOMICS_FUNC(macro)                                    \
     macro(add, Add, 3)                                                  \
     macro(and, And, 3)                                                  \
     macro(compareExchange, CompareExchange, 4)                          \
     macro(exchange, Exchange, 3)                                        \
     macro(isLockFree, IsLockFree, 1)                                    \
     macro(load, Load, 2)                                                \
     macro(or, Or, 3)                                                    \
     macro(store, Store, 3)                                              \
     macro(sub, Sub, 3)                                                  \
     macro(wait, Wait, 4)                                                \
     macro(wake, Wake, 3)                                                \
     macro(xor, Xor, 3)

 #define DECLARE_FUNC_PROTO(lowerName, upperName, count)                 \
     EncodedJSValue JSC_HOST_CALL atomicsFunc ## upperName(ExecState*);
 FOR_EACH_ATOMICS_FUNC(DECLARE_FUNC_PROTO)
 #undef DECLARE_FUNC_PROTO

 const ClassInfo AtomicsObject::s_info = { "Atomics", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(AtomicsObject) };

 AtomicsObject::AtomicsObject(VM& vm, Structure* structure)
     : JSNonFinalObject(vm, structure)
 {
 }

 AtomicsObject* AtomicsObject::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
 {
     AtomicsObject* object = new (NotNull, allocateCell<AtomicsObject>(vm.heap)) AtomicsObject(vm, structure);
     object->finishCreation(vm, globalObject);
     return object;
 }

 Structure* AtomicsObject::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
 {
     return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
 }

 void AtomicsObject::finishCreation(VM& vm, JSGlobalObject* globalObject)
 {
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));

 #define PUT_DIRECT_NATIVE_FUNC(lowerName, upperName, count) \
     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, #lowerName), count, atomicsFunc ## upperName, Atomics ## upperName ## Intrinsic, static_cast<unsigned>(PropertyAttribute::DontEnum));
     FOR_EACH_ATOMICS_FUNC(PUT_DIRECT_NATIVE_FUNC)
 #undef PUT_DIRECT_NATIVE_FUNC
 }

 namespace {

 template<typename Adaptor, typename Func>
 EncodedJSValue atomicOperationWithArgsCase(ExecState* exec, const JSValue* args, ThrowScope& scope, JSArrayBufferView* typedArrayView, unsigned accessIndex, const Func& func)
 {
     JSGenericTypedArrayView<Adaptor>* typedArray = jsCast<JSGenericTypedArrayView<Adaptor>*>(typedArrayView);

     double extraArgs[Func::numExtraArgs + 1]; // Add 1 to avoid 0 size array error in VS.
     for (unsigned i = 0; i < Func::numExtraArgs; ++i) {
         double value = args[2 + i].toInteger(exec);
         RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
         extraArgs[i] = value;
     }

     return JSValue::encode(func(typedArray->typedVector() + accessIndex, extraArgs));
 }

 unsigned validatedAccessIndex(VM& vm, ExecState* exec, JSValue accessIndexValue, JSArrayBufferView* typedArrayView)
 {
     auto scope = DECLARE_THROW_SCOPE(vm);
     if (UNLIKELY(!accessIndexValue.isInt32())) {
         double accessIndexDouble = accessIndexValue.toNumber(exec);
         RETURN_IF_EXCEPTION(scope, 0);
         if (accessIndexDouble == 0)
             accessIndexValue = jsNumber(0);
         else {
             accessIndexValue = jsNumber(accessIndexDouble);
             if (!accessIndexValue.isInt32()) {
                 throwRangeError(exec, scope, ASCIILiteral("Access index is not an integer."));
                 return 0;
             }
         }
     }
     int32_t accessIndex = accessIndexValue.asInt32();

     ASSERT(typedArrayView->length() <= static_cast<unsigned>(INT_MAX));
     if (static_cast<unsigned>(accessIndex) >= typedArrayView->length()) {
         throwRangeError(exec, scope, ASCIILiteral("Access index out of bounds for atomic access."));
         return 0;
     }

     return accessIndex;
 }

 template<typename Func>
 EncodedJSValue atomicOperationWithArgs(VM& vm, ExecState* exec, const JSValue* args, const Func& func)
 {
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue typedArrayValue = args[0];
     if (!typedArrayValue.isCell()) {
         throwTypeError(exec, scope, ASCIILiteral("Typed array argument must be a cell."));
         return JSValue::encode(jsUndefined());
     }

     JSCell* typedArrayCell = typedArrayValue.asCell();

     JSType type = typedArrayCell->type();
     switch (type) {
     case Int8ArrayType:
     case Int16ArrayType:
     case Int32ArrayType:
     case Uint8ArrayType:
     case Uint16ArrayType:
     case Uint32ArrayType:
         break;
     default:
         throwTypeError(exec, scope, ASCIILiteral("Typed array argument must be an Int8Array, Int16Array, Int32Array, Uint8Array, Uint16Array, or Uint32Array."));
         return JSValue::encode(jsUndefined());
     }

     JSArrayBufferView* typedArrayView = jsCast<JSArrayBufferView*>(typedArrayCell);
     if (!typedArrayView->isShared()) {
         throwTypeError(exec, scope, ASCIILiteral("Typed array argument must wrap a SharedArrayBuffer."));
         return JSValue::encode(jsUndefined());
     }

     unsigned accessIndex = validatedAccessIndex(vm, exec, args[1], typedArrayView);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

     switch (type) {
     case Int8ArrayType:
         return atomicOperationWithArgsCase<Int8Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
     case Int16ArrayType:
         return atomicOperationWithArgsCase<Int16Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
     case Int32ArrayType:
         return atomicOperationWithArgsCase<Int32Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
     case Uint8ArrayType:
         return atomicOperationWithArgsCase<Uint8Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
     case Uint16ArrayType:
         return atomicOperationWithArgsCase<Uint16Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
     case Uint32ArrayType:
         return atomicOperationWithArgsCase<Uint32Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
     default:
         RELEASE_ASSERT_NOT_REACHED();
         return JSValue::encode(jsUndefined());
     }
 }

 template<typename Func>
 EncodedJSValue atomicOperationWithArgs(ExecState* exec, const Func& func)
 {
     JSValue args[2 + Func::numExtraArgs];
     for (unsigned i = 2 + Func::numExtraArgs; i--;)
         args[i] = exec->argument(i);
     return atomicOperationWithArgs(exec->vm(), exec, args, func);
 }

 struct AddFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         return jsNumber(WTF::atomicExchangeAdd(ptr, toInt32(args[0])));
     }
 };

 struct AndFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         return jsNumber(WTF::atomicExchangeAnd(ptr, toInt32(args[0])));
     }
 };

 struct CompareExchangeFunc {
     static const unsigned numExtraArgs = 2;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         T expected = static_cast<T>(toInt32(args[0]));
         T newValue = static_cast<T>(toInt32(args[1]));
         return jsNumber(WTF::atomicCompareExchangeStrong(ptr, expected, newValue));
     }
 };

 struct ExchangeFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         return jsNumber(WTF::atomicExchange(ptr, static_cast<T>(toInt32(args[0]))));
     }
 };

 struct LoadFunc {
     static const unsigned numExtraArgs = 0;

     template<typename T>
     JSValue operator()(T* ptr, const double*) const
     {
         return jsNumber(WTF::atomicLoadFullyFenced(ptr));
     }
 };

 struct OrFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         return jsNumber(WTF::atomicExchangeOr(ptr, toInt32(args[0])));
     }
 };

 struct StoreFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         double valueAsInt = args[0];
         T valueAsT = static_cast<T>(toInt32(valueAsInt));
         WTF::atomicStoreFullyFenced(ptr, valueAsT);
         return jsNumber(valueAsInt);
     }
 };

 struct SubFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         return jsNumber(WTF::atomicExchangeSub(ptr, toInt32(args[0])));
     }
 };

 struct XorFunc {
     static const unsigned numExtraArgs = 1;

     template<typename T>
     JSValue operator()(T* ptr, const double* args) const
     {
         return jsNumber(WTF::atomicExchangeXor(ptr, toInt32(args[0])));
     }
 };

 EncodedJSValue isLockFree(ExecState* exec, JSValue arg)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     int32_t size = arg.toInt32(exec);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

     bool result;
     switch (size) {
     case 1:
     case 2:
     case 4:
         result = true;
         break;
     default:
         result = false;
         break;
     }
     return JSValue::encode(jsBoolean(result));
 }

 } // anonymous namespace

 EncodedJSValue JSC_HOST_CALL atomicsFuncAdd(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, AddFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncAnd(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, AndFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncCompareExchange(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, CompareExchangeFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncExchange(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, ExchangeFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncIsLockFree(ExecState* exec)
 {
     return isLockFree(exec, exec->argument(0));
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncLoad(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, LoadFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncOr(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, OrFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncStore(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, StoreFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncSub(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, SubFunc());
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncWait(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSInt32Array* typedArray = jsDynamicCast<JSInt32Array*>(vm, exec->argument(0));
     if (!typedArray) {
         throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must be an Int32Array."));
         return JSValue::encode(jsUndefined());
     }

     if (!typedArray->isShared()) {
         throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must wrap a SharedArrayBuffer."));
         return JSValue::encode(jsUndefined());
     }

     unsigned accessIndex = validatedAccessIndex(vm, exec, exec->argument(1), typedArray);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

     int32_t* ptr = typedArray->typedVector() + accessIndex;

     int32_t expectedValue = exec->argument(2).toInt32(exec);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

     double timeoutInMilliseconds = exec->argument(3).toNumber(exec);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

     if (!vm.m_typedArrayController->isAtomicsWaitAllowedOnCurrentThread()) {
         throwTypeError(exec, scope, ASCIILiteral("Atomics.wait cannot be called from the current thread."));
         return JSValue::encode(jsUndefined());
     }

     Seconds timeout = Seconds::fromMilliseconds(timeoutInMilliseconds);

     // This covers the proposed rule:
     //
     // 4. If timeout is not provided or is undefined then let t be +inf. Otherwise:
     //     a. Let q be ? ToNumber(timeout).
     //     b. If q is NaN then let t be +inf, otherwise let t be max(0, q).
     //
     // exec->argument(3) returns undefined if it's not provided and ToNumber(undefined) returns NaN,
     // so NaN is the only special case.
     if (!std::isnan(timeout))
         timeout = std::max(0_s, timeout);
     else
         timeout = Seconds::infinity();

     bool didPassValidation = false;
     ParkingLot::ParkResult result;
     {
         ReleaseHeapAccessScope releaseHeapAccessScope(vm.heap);
         result = ParkingLot::parkConditionally(
             ptr,
             [&] () -> bool {
                 didPassValidation = WTF::atomicLoad(ptr) == expectedValue;
                 return didPassValidation;
             },
             [] () { },
             MonotonicTime::now() + timeout);
     }
     const char* resultString;
     if (!didPassValidation)
         resultString = "not-equal";
     else if (!result.wasUnparked)
         resultString = "timed-out";
     else
         resultString = "ok";
     return JSValue::encode(jsString(exec, ASCIILiteral(resultString)));
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncWake(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSInt32Array* typedArray = jsDynamicCast<JSInt32Array*>(vm, exec->argument(0));
     if (!typedArray) {
         throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must be an Int32Array."));
         return JSValue::encode(jsUndefined());
     }

     if (!typedArray->isShared()) {
         throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must wrap a SharedArrayBuffer."));
         return JSValue::encode(jsUndefined());
     }

     unsigned accessIndex = validatedAccessIndex(vm, exec, exec->argument(1), typedArray);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

     int32_t* ptr = typedArray->typedVector() + accessIndex;

     JSValue countValue = exec->argument(2);
     unsigned count = UINT_MAX;
     if (!countValue.isUndefined()) {
         int32_t countInt = countValue.toInt32(exec);
         RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
         count = std::max(0, countInt);
     }

     return JSValue::encode(jsNumber(ParkingLot::unparkCount(ptr, count)));
 }

 EncodedJSValue JSC_HOST_CALL atomicsFuncXor(ExecState* exec)
 {
     return atomicOperationWithArgs(exec, XorFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsAdd(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, AddFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsAnd(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, AndFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsCompareExchange(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue expected, EncodedJSValue newValue)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(expected), JSValue::decode(newValue)};
     return atomicOperationWithArgs(vm, exec, args, CompareExchangeFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsExchange(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, ExchangeFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsIsLockFree(ExecState* exec, EncodedJSValue size)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     return isLockFree(exec, JSValue::decode(size));
 }

 EncodedJSValue JIT_OPERATION operationAtomicsLoad(ExecState* exec, EncodedJSValue base, EncodedJSValue index)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index)};
     return atomicOperationWithArgs(vm, exec, args, LoadFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsOr(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, OrFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsStore(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, StoreFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsSub(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, SubFunc());
 }

 EncodedJSValue JIT_OPERATION operationAtomicsXor(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);
     JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
     return atomicOperationWithArgs(vm, exec, args, XorFunc());
 }

 } // namespace JSC
	/*
	* Copyright (C) 2016-2017 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "AtomicsObject.h"

	#include "FrameTracers.h"
	#include "JSCInlines.h"
	#include "JSTypedArrays.h"
	#include "ObjectPrototype.h"
	#include "ReleaseHeapAccessScope.h"
	#include "TypedArrayController.h"

	namespace JSC {

	STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(AtomicsObject);

	#define FOR_EACH_ATOMICS_FUNC(macro) \
	macro(add, Add, 3) \
	macro(and, And, 3) \
	macro(compareExchange, CompareExchange, 4) \
	macro(exchange, Exchange, 3) \
	macro(isLockFree, IsLockFree, 1) \
	macro(load, Load, 2) \
	macro(or, Or, 3) \
	macro(store, Store, 3) \
	macro(sub, Sub, 3) \
	macro(wait, Wait, 4) \
	macro(wake, Wake, 3) \
	macro(xor, Xor, 3)

	#define DECLARE_FUNC_PROTO(lowerName, upperName, count) \
	EncodedJSValue JSC_HOST_CALL atomicsFunc ## upperName(ExecState*);
	FOR_EACH_ATOMICS_FUNC(DECLARE_FUNC_PROTO)
	#undef DECLARE_FUNC_PROTO

	const ClassInfo AtomicsObject::s_info = { "Atomics", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(AtomicsObject) };

	AtomicsObject::AtomicsObject(VM& vm, Structure* structure)
	: JSNonFinalObject(vm, structure)
	{
	}

	AtomicsObject* AtomicsObject::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
	{
	AtomicsObject* object = new (NotNull, allocateCell<AtomicsObject>(vm.heap)) AtomicsObject(vm, structure);
	object->finishCreation(vm, globalObject);
	return object;
	}

	Structure* AtomicsObject::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
	{
	return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
	}

	void AtomicsObject::finishCreation(VM& vm, JSGlobalObject* globalObject)
	{
	Base::finishCreation(vm);
	ASSERT(inherits(vm, info()));

	#define PUT_DIRECT_NATIVE_FUNC(lowerName, upperName, count) \
	putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, #lowerName), count, atomicsFunc ## upperName, Atomics ## upperName ## Intrinsic, static_cast<unsigned>(PropertyAttribute::DontEnum));
	FOR_EACH_ATOMICS_FUNC(PUT_DIRECT_NATIVE_FUNC)
	#undef PUT_DIRECT_NATIVE_FUNC
	}

	namespace {

	template<typename Adaptor, typename Func>
	EncodedJSValue atomicOperationWithArgsCase(ExecState* exec, const JSValue* args, ThrowScope& scope, JSArrayBufferView* typedArrayView, unsigned accessIndex, const Func& func)
	{
	JSGenericTypedArrayView<Adaptor>* typedArray = jsCast<JSGenericTypedArrayView<Adaptor>*>(typedArrayView);

	double extraArgs[Func::numExtraArgs + 1]; // Add 1 to avoid 0 size array error in VS.
	for (unsigned i = 0; i < Func::numExtraArgs; ++i) {
	double value = args[2 + i].toInteger(exec);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
	extraArgs[i] = value;
	}

	return JSValue::encode(func(typedArray->typedVector() + accessIndex, extraArgs));
	}

	unsigned validatedAccessIndex(VM& vm, ExecState* exec, JSValue accessIndexValue, JSArrayBufferView* typedArrayView)
	{
	auto scope = DECLARE_THROW_SCOPE(vm);
	if (UNLIKELY(!accessIndexValue.isInt32())) {
	double accessIndexDouble = accessIndexValue.toNumber(exec);
	RETURN_IF_EXCEPTION(scope, 0);
	if (accessIndexDouble == 0)
	accessIndexValue = jsNumber(0);
	else {
	accessIndexValue = jsNumber(accessIndexDouble);
	if (!accessIndexValue.isInt32()) {
	throwRangeError(exec, scope, ASCIILiteral("Access index is not an integer."));
	return 0;
	}
	}
	}
	int32_t accessIndex = accessIndexValue.asInt32();

	ASSERT(typedArrayView->length() <= static_cast<unsigned>(INT_MAX));
	if (static_cast<unsigned>(accessIndex) >= typedArrayView->length()) {
	throwRangeError(exec, scope, ASCIILiteral("Access index out of bounds for atomic access."));
	return 0;
	}

	return accessIndex;
	}

	template<typename Func>
	EncodedJSValue atomicOperationWithArgs(VM& vm, ExecState* exec, const JSValue* args, const Func& func)
	{
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue typedArrayValue = args[0];
	if (!typedArrayValue.isCell()) {
	throwTypeError(exec, scope, ASCIILiteral("Typed array argument must be a cell."));
	return JSValue::encode(jsUndefined());
	}

	JSCell* typedArrayCell = typedArrayValue.asCell();

	JSType type = typedArrayCell->type();
	switch (type) {
	case Int8ArrayType:
	case Int16ArrayType:
	case Int32ArrayType:
	case Uint8ArrayType:
	case Uint16ArrayType:
	case Uint32ArrayType:
	break;
	default:
	throwTypeError(exec, scope, ASCIILiteral("Typed array argument must be an Int8Array, Int16Array, Int32Array, Uint8Array, Uint16Array, or Uint32Array."));
	return JSValue::encode(jsUndefined());
	}

	JSArrayBufferView* typedArrayView = jsCast<JSArrayBufferView*>(typedArrayCell);
	if (!typedArrayView->isShared()) {
	throwTypeError(exec, scope, ASCIILiteral("Typed array argument must wrap a SharedArrayBuffer."));
	return JSValue::encode(jsUndefined());
	}

	unsigned accessIndex = validatedAccessIndex(vm, exec, args[1], typedArrayView);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

	switch (type) {
	case Int8ArrayType:
	return atomicOperationWithArgsCase<Int8Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
	case Int16ArrayType:
	return atomicOperationWithArgsCase<Int16Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
	case Int32ArrayType:
	return atomicOperationWithArgsCase<Int32Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
	case Uint8ArrayType:
	return atomicOperationWithArgsCase<Uint8Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
	case Uint16ArrayType:
	return atomicOperationWithArgsCase<Uint16Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
	case Uint32ArrayType:
	return atomicOperationWithArgsCase<Uint32Adaptor>(exec, args, scope, typedArrayView, accessIndex, func);
	default:
	RELEASE_ASSERT_NOT_REACHED();
	return JSValue::encode(jsUndefined());
	}
	}

	template<typename Func>
	EncodedJSValue atomicOperationWithArgs(ExecState* exec, const Func& func)
	{
	JSValue args[2 + Func::numExtraArgs];
	for (unsigned i = 2 + Func::numExtraArgs; i--;)
	args[i] = exec->argument(i);
	return atomicOperationWithArgs(exec->vm(), exec, args, func);
	}

	struct AddFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	return jsNumber(WTF::atomicExchangeAdd(ptr, toInt32(args[0])));
	}
	};

	struct AndFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	return jsNumber(WTF::atomicExchangeAnd(ptr, toInt32(args[0])));
	}
	};

	struct CompareExchangeFunc {
	static const unsigned numExtraArgs = 2;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	T expected = static_cast<T>(toInt32(args[0]));
	T newValue = static_cast<T>(toInt32(args[1]));
	return jsNumber(WTF::atomicCompareExchangeStrong(ptr, expected, newValue));
	}
	};

	struct ExchangeFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	return jsNumber(WTF::atomicExchange(ptr, static_cast<T>(toInt32(args[0]))));
	}
	};

	struct LoadFunc {
	static const unsigned numExtraArgs = 0;

	template<typename T>
	JSValue operator()(T* ptr, const double*) const
	{
	return jsNumber(WTF::atomicLoadFullyFenced(ptr));
	}
	};

	struct OrFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	return jsNumber(WTF::atomicExchangeOr(ptr, toInt32(args[0])));
	}
	};

	struct StoreFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	double valueAsInt = args[0];
	T valueAsT = static_cast<T>(toInt32(valueAsInt));
	WTF::atomicStoreFullyFenced(ptr, valueAsT);
	return jsNumber(valueAsInt);
	}
	};

	struct SubFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	return jsNumber(WTF::atomicExchangeSub(ptr, toInt32(args[0])));
	}
	};

	struct XorFunc {
	static const unsigned numExtraArgs = 1;

	template<typename T>
	JSValue operator()(T* ptr, const double* args) const
	{
	return jsNumber(WTF::atomicExchangeXor(ptr, toInt32(args[0])));
	}
	};

	EncodedJSValue isLockFree(ExecState* exec, JSValue arg)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	int32_t size = arg.toInt32(exec);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

	bool result;
	switch (size) {
	case 1:
	case 2:
	case 4:
	result = true;
	break;
	default:
	result = false;
	break;
	}
	return JSValue::encode(jsBoolean(result));
	}

	} // anonymous namespace

	EncodedJSValue JSC_HOST_CALL atomicsFuncAdd(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, AddFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncAnd(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, AndFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncCompareExchange(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, CompareExchangeFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncExchange(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, ExchangeFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncIsLockFree(ExecState* exec)
	{
	return isLockFree(exec, exec->argument(0));
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncLoad(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, LoadFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncOr(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, OrFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncStore(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, StoreFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncSub(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, SubFunc());
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncWait(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSInt32Array* typedArray = jsDynamicCast<JSInt32Array*>(vm, exec->argument(0));
	if (!typedArray) {
	throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must be an Int32Array."));
	return JSValue::encode(jsUndefined());
	}

	if (!typedArray->isShared()) {
	throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must wrap a SharedArrayBuffer."));
	return JSValue::encode(jsUndefined());
	}

	unsigned accessIndex = validatedAccessIndex(vm, exec, exec->argument(1), typedArray);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

	int32_t* ptr = typedArray->typedVector() + accessIndex;

	int32_t expectedValue = exec->argument(2).toInt32(exec);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

	double timeoutInMilliseconds = exec->argument(3).toNumber(exec);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

	if (!vm.m_typedArrayController->isAtomicsWaitAllowedOnCurrentThread()) {
	throwTypeError(exec, scope, ASCIILiteral("Atomics.wait cannot be called from the current thread."));
	return JSValue::encode(jsUndefined());
	}

	Seconds timeout = Seconds::fromMilliseconds(timeoutInMilliseconds);

	// This covers the proposed rule:
	//
	// 4. If timeout is not provided or is undefined then let t be +inf. Otherwise:
	// a. Let q be ? ToNumber(timeout).
	// b. If q is NaN then let t be +inf, otherwise let t be max(0, q).
	//
	// exec->argument(3) returns undefined if it's not provided and ToNumber(undefined) returns NaN,
	// so NaN is the only special case.
	if (!std::isnan(timeout))
	timeout = std::max(0_s, timeout);
	else
	timeout = Seconds::infinity();

	bool didPassValidation = false;
	ParkingLot::ParkResult result;
	{
	ReleaseHeapAccessScope releaseHeapAccessScope(vm.heap);
	result = ParkingLot::parkConditionally(
	ptr,
	[&] () -> bool {
	didPassValidation = WTF::atomicLoad(ptr) == expectedValue;
	return didPassValidation;
	},
	[] () { },
	MonotonicTime::now() + timeout);
	}
	const char* resultString;
	if (!didPassValidation)
	resultString = "not-equal";
	else if (!result.wasUnparked)
	resultString = "timed-out";
	else
	resultString = "ok";
	return JSValue::encode(jsString(exec, ASCIILiteral(resultString)));
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncWake(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSInt32Array* typedArray = jsDynamicCast<JSInt32Array*>(vm, exec->argument(0));
	if (!typedArray) {
	throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must be an Int32Array."));
	return JSValue::encode(jsUndefined());
	}

	if (!typedArray->isShared()) {
	throwTypeError(exec, scope, ASCIILiteral("Typed array for wait/wake must wrap a SharedArrayBuffer."));
	return JSValue::encode(jsUndefined());
	}

	unsigned accessIndex = validatedAccessIndex(vm, exec, exec->argument(1), typedArray);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));

	int32_t* ptr = typedArray->typedVector() + accessIndex;

	JSValue countValue = exec->argument(2);
	unsigned count = UINT_MAX;
	if (!countValue.isUndefined()) {
	int32_t countInt = countValue.toInt32(exec);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
	count = std::max(0, countInt);
	}

	return JSValue::encode(jsNumber(ParkingLot::unparkCount(ptr, count)));
	}

	EncodedJSValue JSC_HOST_CALL atomicsFuncXor(ExecState* exec)
	{
	return atomicOperationWithArgs(exec, XorFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsAdd(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, AddFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsAnd(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, AndFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsCompareExchange(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue expected, EncodedJSValue newValue)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(expected), JSValue::decode(newValue)};
	return atomicOperationWithArgs(vm, exec, args, CompareExchangeFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsExchange(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, ExchangeFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsIsLockFree(ExecState* exec, EncodedJSValue size)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	return isLockFree(exec, JSValue::decode(size));
	}

	EncodedJSValue JIT_OPERATION operationAtomicsLoad(ExecState* exec, EncodedJSValue base, EncodedJSValue index)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index)};
	return atomicOperationWithArgs(vm, exec, args, LoadFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsOr(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, OrFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsStore(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, StoreFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsSub(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, SubFunc());
	}

	EncodedJSValue JIT_OPERATION operationAtomicsXor(ExecState* exec, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);
	JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
	return atomicOperationWithArgs(vm, exec, args, XorFunc());
	}

	} // namespace JSC