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/*
* Copyright (C) 2016-2019 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 "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) \
static JSC_DECLARE_HOST_FUNCTION(atomicsFunc ## upperName);
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(JSGlobalObject* globalObject, 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(globalObject);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
extraArgs[i] = value;
}
return JSValue::encode(func(typedArray->typedVector() + accessIndex, extraArgs));
}
unsigned validatedAccessIndex(VM& vm, JSGlobalObject* globalObject, JSValue accessIndexValue, JSArrayBufferView* typedArrayView)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (UNLIKELY(!accessIndexValue.isInt32())) {
double accessIndexDouble = accessIndexValue.toNumber(globalObject);
RETURN_IF_EXCEPTION(scope, 0);
if (accessIndexDouble == 0)
accessIndexValue = jsNumber(0);
else {
accessIndexValue = jsNumber(accessIndexDouble);
if (!accessIndexValue.isInt32()) {
throwRangeError(globalObject, scope, "Access index is not an integer."_s);
return 0;
}
}
}
int32_t accessIndex = accessIndexValue.asInt32();
ASSERT(typedArrayView->length() <= static_cast<unsigned>(INT_MAX));
if (static_cast<unsigned>(accessIndex) >= typedArrayView->length()) {
throwRangeError(globalObject, scope, "Access index out of bounds for atomic access."_s);
return 0;
}
return accessIndex;
}
template<typename Func>
EncodedJSValue atomicOperationWithArgs(VM& vm, JSGlobalObject* globalObject, const JSValue* args, const Func& func)
{
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue typedArrayValue = args[0];
if (!typedArrayValue.isCell()) {
throwTypeError(globalObject, scope, "Typed array argument must be a cell."_s);
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(globalObject, scope, "Typed array argument must be an Int8Array, Int16Array, Int32Array, Uint8Array, Uint16Array, or Uint32Array."_s);
return JSValue::encode(jsUndefined());
}
JSArrayBufferView* typedArrayView = jsCast<JSArrayBufferView*>(typedArrayCell);
if (!typedArrayView->isShared()) {
throwTypeError(globalObject, scope, "Typed array argument must wrap a SharedArrayBuffer."_s);
return JSValue::encode(jsUndefined());
}
unsigned accessIndex = validatedAccessIndex(vm, globalObject, args[1], typedArrayView);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
switch (type) {
case Int8ArrayType:
return atomicOperationWithArgsCase<Int8Adaptor>(globalObject, args, scope, typedArrayView, accessIndex, func);
case Int16ArrayType:
return atomicOperationWithArgsCase<Int16Adaptor>(globalObject, args, scope, typedArrayView, accessIndex, func);
case Int32ArrayType:
return atomicOperationWithArgsCase<Int32Adaptor>(globalObject, args, scope, typedArrayView, accessIndex, func);
case Uint8ArrayType:
return atomicOperationWithArgsCase<Uint8Adaptor>(globalObject, args, scope, typedArrayView, accessIndex, func);
case Uint16ArrayType:
return atomicOperationWithArgsCase<Uint16Adaptor>(globalObject, args, scope, typedArrayView, accessIndex, func);
case Uint32ArrayType:
return atomicOperationWithArgsCase<Uint32Adaptor>(globalObject, args, scope, typedArrayView, accessIndex, func);
default:
RELEASE_ASSERT_NOT_REACHED();
return JSValue::encode(jsUndefined());
}
}
template<typename Func>
EncodedJSValue atomicOperationWithArgs(JSGlobalObject* globalObject, CallFrame* callFrame, const Func& func)
{
JSValue args[2 + Func::numExtraArgs];
for (unsigned i = 2 + Func::numExtraArgs; i--;)
args[i] = callFrame->argument(i);
return atomicOperationWithArgs(globalObject->vm(), globalObject, args, func);
}
struct AddFunc {
static constexpr 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 constexpr 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 constexpr 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 constexpr 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 constexpr unsigned numExtraArgs = 0;
template<typename T>
JSValue operator()(T* ptr, const double*) const
{
return jsNumber(WTF::atomicLoadFullyFenced(ptr));
}
};
struct OrFunc {
static constexpr 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 constexpr 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 constexpr 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 constexpr unsigned numExtraArgs = 1;
template<typename T>
JSValue operator()(T* ptr, const double* args) const
{
return jsNumber(WTF::atomicExchangeXor(ptr, toInt32(args[0])));
}
};
EncodedJSValue isLockFree(JSGlobalObject* globalObject, JSValue arg)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
int32_t size = arg.toInt32(globalObject);
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
JSC_DEFINE_HOST_FUNCTION(atomicsFuncAdd, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, AddFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncAnd, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, AndFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncCompareExchange, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, CompareExchangeFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncExchange, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, ExchangeFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncIsLockFree, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return isLockFree(globalObject, callFrame->argument(0));
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncLoad, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, LoadFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncOr, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, OrFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncStore, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, StoreFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncSub, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, SubFunc());
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncWait, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSInt32Array* typedArray = jsDynamicCast<JSInt32Array*>(vm, callFrame->argument(0));
if (!typedArray) {
throwTypeError(globalObject, scope, "Typed array for wait/wake must be an Int32Array."_s);
return JSValue::encode(jsUndefined());
}
if (!typedArray->isShared()) {
throwTypeError(globalObject, scope, "Typed array for wait/wake must wrap a SharedArrayBuffer."_s);
return JSValue::encode(jsUndefined());
}
unsigned accessIndex = validatedAccessIndex(vm, globalObject, callFrame->argument(1), typedArray);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
int32_t* ptr = typedArray->typedVector() + accessIndex;
int32_t expectedValue = callFrame->argument(2).toInt32(globalObject);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
double timeoutInMilliseconds = callFrame->argument(3).toNumber(globalObject);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
if (!vm.m_typedArrayController->isAtomicsWaitAllowedOnCurrentThread()) {
throwTypeError(globalObject, scope, "Atomics.wait cannot be called from the current thread."_s);
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).
//
// callFrame->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(vm, resultString));
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncWake, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSInt32Array* typedArray = jsDynamicCast<JSInt32Array*>(vm, callFrame->argument(0));
if (!typedArray) {
throwTypeError(globalObject, scope, "Typed array for wait/wake must be an Int32Array."_s);
return JSValue::encode(jsUndefined());
}
if (!typedArray->isShared()) {
throwTypeError(globalObject, scope, "Typed array for wait/wake must wrap a SharedArrayBuffer."_s);
return JSValue::encode(jsUndefined());
}
unsigned accessIndex = validatedAccessIndex(vm, globalObject, callFrame->argument(1), typedArray);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
int32_t* ptr = typedArray->typedVector() + accessIndex;
JSValue countValue = callFrame->argument(2);
unsigned count = UINT_MAX;
if (!countValue.isUndefined()) {
int32_t countInt = countValue.toInt32(globalObject);
RETURN_IF_EXCEPTION(scope, JSValue::encode(jsUndefined()));
count = std::max(0, countInt);
}
return JSValue::encode(jsNumber(ParkingLot::unparkCount(ptr, count)));
}
JSC_DEFINE_HOST_FUNCTION(atomicsFuncXor, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
return atomicOperationWithArgs(globalObject, callFrame, XorFunc());
}
IGNORE_WARNINGS_BEGIN("frame-address")
JSC_DEFINE_JIT_OPERATION(operationAtomicsAdd, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, AddFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsAnd, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, AndFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsCompareExchange, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue expected, EncodedJSValue newValue))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(expected), JSValue::decode(newValue)};
return atomicOperationWithArgs(vm, globalObject, args, CompareExchangeFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsExchange, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, ExchangeFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsIsLockFree, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue size))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
return isLockFree(globalObject, JSValue::decode(size));
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsLoad, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index)};
return atomicOperationWithArgs(vm, globalObject, args, LoadFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsOr, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, OrFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsStore, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, StoreFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsSub, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, SubFunc());
}
JSC_DEFINE_JIT_OPERATION(operationAtomicsXor, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue index, EncodedJSValue operand))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
JSValue args[] = {JSValue::decode(base), JSValue::decode(index), JSValue::decode(operand)};
return atomicOperationWithArgs(vm, globalObject, args, XorFunc());
}
IGNORE_WARNINGS_END
} // namespace JSC