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darling-JavaScriptCore/jit/CCallHelpers.h

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/*
* Copyright (C) 2011-2020 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.
*/
#pragma once
#if ENABLE(JIT)
#include "AssemblyHelpers.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "StackAlignment.h"
#include <wtf/FunctionTraits.h>
namespace JSC {
#if CPU(MIPS) || (OS(WINDOWS) && CPU(X86_64))
#define POKE_ARGUMENT_OFFSET 4
#else
#define POKE_ARGUMENT_OFFSET 0
#endif
class CallFrame;
class Structure;
namespace DFG {
class RegisteredStructure;
};
class CCallHelpers : public AssemblyHelpers {
public:
CCallHelpers(CodeBlock* codeBlock = nullptr)
: AssemblyHelpers(codeBlock)
{
}
// Wrapper to encode JSCell GPR into JSValue.
class CellValue {
public:
explicit CellValue(GPRReg gpr)
: m_gpr(gpr)
{
}
GPRReg gpr() const { return m_gpr; }
private:
GPRReg m_gpr;
};
// The most general helper for setting arguments that fit in a GPR, if you can compute each
// argument without using any argument registers. You usually want one of the setupArguments*()
// methods below instead of this. This thing is most useful if you have *a lot* of arguments.
template<typename Functor>
void setupArgument(unsigned argumentIndex, const Functor& functor)
{
unsigned numberOfRegs = GPRInfo::numberOfArgumentRegisters; // Disguise the constant from clang's tautological compare warning.
if (argumentIndex < numberOfRegs) {
functor(GPRInfo::toArgumentRegister(argumentIndex));
return;
}
functor(GPRInfo::nonArgGPR0);
poke(GPRInfo::nonArgGPR0, POKE_ARGUMENT_OFFSET + argumentIndex - GPRInfo::numberOfArgumentRegisters);
}
private:
template<unsigned NumberOfRegisters, typename RegType>
ALWAYS_INLINE void setupStubArgs(std::array<RegType, NumberOfRegisters> destinations, std::array<RegType, NumberOfRegisters> sources)
{
if (ASSERT_ENABLED) {
RegisterSet set;
for (RegType dest : destinations)
set.set(dest);
ASSERT_WITH_MESSAGE(set.numberOfSetRegisters() == NumberOfRegisters, "Destinations should not be aliased.");
}
typedef std::pair<RegType, RegType> RegPair;
Vector<RegPair, NumberOfRegisters> pairs;
// if constexpr avoids warnings when NumberOfRegisters is 0.
if constexpr (NumberOfRegisters > 0) {
for (unsigned i = 0; i < NumberOfRegisters; ++i) {
if (sources[i] != destinations[i])
pairs.append(std::make_pair(sources[i], destinations[i]));
}
} else {
// Silence some older compilers (GCC up to 9.X) about unused but set parameters.
UNUSED_PARAM(sources);
UNUSED_PARAM(destinations);
}
#if ASSERT_ENABLED
auto numUniqueSources = [&] () -> unsigned {
RegisterSet set;
for (auto& pair : pairs) {
RegType source = pair.first;
set.set(source);
}
return set.numberOfSetRegisters();
};
auto numUniqueDests = [&] () -> unsigned {
RegisterSet set;
for (auto& pair : pairs) {
RegType dest = pair.second;
set.set(dest);
}
return set.numberOfSetRegisters();
};
#endif
while (pairs.size()) {
RegisterSet freeDestinations;
for (auto& pair : pairs) {
RegType dest = pair.second;
freeDestinations.set(dest);
}
for (auto& pair : pairs) {
RegType source = pair.first;
freeDestinations.clear(source);
}
if (freeDestinations.numberOfSetRegisters()) {
bool madeMove = false;
for (unsigned i = 0; i < pairs.size(); i++) {
auto& pair = pairs[i];
RegType source = pair.first;
RegType dest = pair.second;
if (freeDestinations.get(dest)) {
move(source, dest);
pairs.remove(i);
madeMove = true;
break;
}
}
ASSERT_UNUSED(madeMove, madeMove);
continue;
}
ASSERT(numUniqueDests() == numUniqueSources());
ASSERT(numUniqueDests() == pairs.size());
// The set of source and destination registers are equivalent sets. This means we don't have
// any free destination registers that won't also clobber a source. We get around this by
// exchanging registers.
RegType source = pairs[0].first;
RegType dest = pairs[0].second;
swap(source, dest);
pairs.remove(0);
RegType newSource = source;
for (auto& pair : pairs) {
RegType source = pair.first;
if (source == dest) {
pair.first = newSource;
break;
}
}
// We may have introduced pairs that have the same source and destination. Remove those now.
for (unsigned i = 0; i < pairs.size(); i++) {
auto& pair = pairs[i];
if (pair.first == pair.second) {
pairs.remove(i);
i--;
}
}
}
}
#if CPU(MIPS) || (CPU(ARM_THUMB2) && !CPU(ARM_HARDFP))
template<unsigned NumCrossSources, unsigned NumberOfRegisters>
ALWAYS_INLINE void setupStubCrossArgs(std::array<GPRReg, NumberOfRegisters> destinations, std::array<FPRReg, NumberOfRegisters> sources) {
for (unsigned i = 0; i < NumCrossSources; i++) {
GPRReg dest = destinations[i];
FPRReg source = sources[i];
moveDouble(source, dest);
}
}
#endif
template<typename RegType>
using InfoTypeForReg = decltype(toInfoFromReg(RegType(-1)));
// extraGPRArgs is used to track 64-bit argument types passed in register on 32-bit architectures.
// extraPoke is used to track 64-bit argument types passed on the stack.
template<unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke>
struct ArgCollection {
ArgCollection()
{
gprSources.fill(InvalidGPRReg);
gprDestinations.fill(InvalidGPRReg);
fprSources.fill(InvalidFPRReg);
fprDestinations.fill(InvalidFPRReg);
crossSources.fill(InvalidFPRReg);
crossDestinations.fill(InvalidGPRReg);
}
template<unsigned a, unsigned b, unsigned c, unsigned d, unsigned e, unsigned f, unsigned g>
ArgCollection(ArgCollection<a, b, c, d, e, f, g>& other)
{
gprSources = other.gprSources;
gprDestinations = other.gprDestinations;
fprSources = other.fprSources;
fprDestinations = other.fprDestinations;
crossSources = other.crossSources;
crossDestinations = other.crossDestinations;
}
ArgCollection<numGPRArgs + 1, numGPRSources + 1, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> pushRegArg(GPRReg argument, GPRReg destination)
{
ArgCollection<numGPRArgs + 1, numGPRSources + 1, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> result(*this);
result.gprSources[numGPRSources] = argument;
result.gprDestinations[numGPRSources] = destination;
return result;
}
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs + 1, numFPRSources + 1, numCrossSources, extraGPRArgs, extraPoke> pushRegArg(FPRReg argument, FPRReg destination)
{
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs + 1, numFPRSources + 1, numCrossSources, extraGPRArgs, extraPoke> result(*this);
result.fprSources[numFPRSources] = argument;
result.fprDestinations[numFPRSources] = destination;
return result;
}
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs + 1, numFPRSources, numCrossSources + 1, extraGPRArgs, extraPoke> pushRegArg(FPRReg argument, GPRReg destination)
{
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs + 1, numFPRSources, numCrossSources + 1, extraGPRArgs, extraPoke> result(*this);
result.crossSources[numCrossSources] = argument;
result.crossDestinations[numCrossSources] = destination;
return result;
}
ArgCollection<numGPRArgs, numGPRSources + 1, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs + 1, extraPoke> pushExtraRegArg(GPRReg argument, GPRReg destination)
{
ArgCollection<numGPRArgs, numGPRSources + 1, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs + 1, extraPoke> result(*this);
result.gprSources[numGPRSources] = argument;
result.gprDestinations[numGPRSources] = destination;
return result;
}
ArgCollection<numGPRArgs + 1, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> addGPRArg()
{
return ArgCollection<numGPRArgs + 1, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke>(*this);
}
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs + 1, extraPoke> addGPRExtraArg()
{
return ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs + 1, extraPoke>(*this);
}
ArgCollection<numGPRArgs + 1, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> addStackArg(GPRReg)
{
return ArgCollection<numGPRArgs + 1, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke>(*this);
}
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs + 1, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> addStackArg(FPRReg)
{
return ArgCollection<numGPRArgs, numGPRSources, numFPRArgs + 1, numFPRSources, numCrossSources, extraGPRArgs, extraPoke>(*this);
}
ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke + 1> addPoke()
{
return ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke + 1>(*this);
}
#if OS(WINDOWS) && CPU(X86_64)
unsigned argCount(GPRReg) { return numGPRArgs + numFPRArgs; }
unsigned argCount(FPRReg) { return numGPRArgs + numFPRArgs; }
#else
unsigned argCount(GPRReg) { return numGPRArgs + extraGPRArgs; }
unsigned argCount(FPRReg) { return numFPRArgs; }
#endif
// store GPR -> GPR assignments
std::array<GPRReg, GPRInfo::numberOfRegisters> gprSources;
std::array<GPRReg, GPRInfo::numberOfRegisters> gprDestinations;
// store FPR -> FPR assignments
std::array<FPRReg, FPRInfo::numberOfRegisters> fprSources;
std::array<FPRReg, FPRInfo::numberOfRegisters> fprDestinations;
// store FPR -> GPR assignments
std::array<FPRReg, GPRInfo::numberOfRegisters> crossSources;
std::array<GPRReg, GPRInfo::numberOfRegisters> crossDestinations;
};
template<unsigned TargetSize, typename RegType>
std::array<RegType, TargetSize> clampArrayToSize(std::array<RegType, InfoTypeForReg<RegType>::numberOfRegisters> sourceArray)
{
static_assert(TargetSize <= sourceArray.size(), "TargetSize is bigger than source.size()");
RELEASE_ASSERT(TargetSize <= InfoTypeForReg<RegType>::numberOfRegisters);
std::array<RegType, TargetSize> result { };
// if constexpr avoids warnings when TargetSize is 0.
if constexpr (TargetSize > 0) {
for (unsigned i = 0; i < TargetSize; i++) {
ASSERT(sourceArray[i] != static_cast<int32_t>(InfoTypeForReg<RegType>::InvalidIndex));
result[i] = sourceArray[i];
}
}
return result;
}
ALWAYS_INLINE unsigned calculatePokeOffset(unsigned currentGPRArgument, unsigned currentFPRArgument, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke)
{
// Clang claims that it cannot find the symbol for FPRReg/GPRReg::numberOfArgumentRegisters when they are passed directly to std::max... seems like a bug
unsigned numberOfFPArgumentRegisters = FPRInfo::numberOfArgumentRegisters;
unsigned numberOfGPArgumentRegisters = GPRInfo::numberOfArgumentRegisters;
currentGPRArgument += extraGPRArgs;
currentFPRArgument -= numCrossSources;
IGNORE_WARNINGS_BEGIN("type-limits")
ASSERT(currentGPRArgument >= GPRInfo::numberOfArgumentRegisters || currentFPRArgument >= FPRInfo::numberOfArgumentRegisters);
IGNORE_WARNINGS_END
unsigned pokeOffset = POKE_ARGUMENT_OFFSET + extraPoke;
pokeOffset += std::max(currentGPRArgument, numberOfGPArgumentRegisters) - numberOfGPArgumentRegisters;
pokeOffset += std::max(currentFPRArgument, numberOfFPArgumentRegisters) - numberOfFPArgumentRegisters;
return pokeOffset;
}
template<typename ArgType>
ALWAYS_INLINE void pokeForArgument(ArgType arg, unsigned currentGPRArgument, unsigned currentFPRArgument, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke)
{
unsigned pokeOffset = calculatePokeOffset(currentGPRArgument, currentFPRArgument, numCrossSources, extraGPRArgs, extraPoke);
poke(arg, pokeOffset);
}
ALWAYS_INLINE bool stackAligned(unsigned currentGPRArgument, unsigned currentFPRArgument, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke)
{
unsigned pokeOffset = calculatePokeOffset(currentGPRArgument, currentFPRArgument, numCrossSources, extraGPRArgs, extraPoke);
return !(pokeOffset & 1);
}
// In the auto-calling convention code below the order of operations is:
// 1) spill arguments to stack slots
// 2) shuffle incomming argument values in registers to argument registers
// 3) fill immediate values to argument registers
// To do this, we recurse forwards through our args collecting argument values in registers and spilling stack slots.
// when we run out of args we then run our shuffling code to relocate registers. Finally, as we unwind from our
// recursion we can fill immediates.
#define CURRENT_ARGUMENT_TYPE typename FunctionTraits<OperationType>::template ArgumentType<numGPRArgs + numFPRArgs>
#define RESULT_TYPE typename FunctionTraits<OperationType>::ResultType
#if USE(JSVALUE64)
// Avoid MSVC optimization time explosion associated with __forceinline in recursive templates.
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename RegType, typename... Args>
ALWAYS_INLINE_EXCEPT_MSVC void marshallArgumentRegister(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, RegType arg, Args... args)
{
using InfoType = InfoTypeForReg<RegType>;
unsigned numArgRegisters = InfoType::numberOfArgumentRegisters;
#if OS(WINDOWS) && CPU(X86_64)
unsigned currentArgCount = argSourceRegs.argCount(arg) + (std::is_same<RESULT_TYPE, SlowPathReturnType>::value ? 1 : 0);
#else
unsigned currentArgCount = argSourceRegs.argCount(arg);
#endif
if (currentArgCount < numArgRegisters) {
auto updatedArgSourceRegs = argSourceRegs.pushRegArg(arg, InfoType::toArgumentRegister(currentArgCount));
setupArgumentsImpl<OperationType>(updatedArgSourceRegs, args...);
return;
}
pokeForArgument(arg, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke);
setupArgumentsImpl<OperationType>(argSourceRegs.addStackArg(arg), args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
ALWAYS_INLINE void setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, FPRReg arg, Args... args)
{
static_assert(std::is_same<CURRENT_ARGUMENT_TYPE, double>::value, "We should only be passing FPRRegs to a double");
marshallArgumentRegister<OperationType>(argSourceRegs, arg, args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
ALWAYS_INLINE void setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, GPRReg arg, Args... args)
{
marshallArgumentRegister<OperationType>(argSourceRegs, arg, args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
ALWAYS_INLINE void setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, JSValueRegs arg, Args... args)
{
marshallArgumentRegister<OperationType>(argSourceRegs, arg.gpr(), args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
ALWAYS_INLINE void setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, CellValue arg, Args... args)
{
marshallArgumentRegister<OperationType>(argSourceRegs, arg.gpr(), args...);
}
#else // USE(JSVALUE64)
#if CPU(ARM_THUMB2) || CPU(MIPS)
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
void setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, FPRReg arg, Args... args)
{
static_assert(std::is_same<CURRENT_ARGUMENT_TYPE, double>::value, "We should only be passing FPRRegs to a double");
// MIPS and ARM-hardfp pass FP arguments in FP registers.
#if CPU(MIPS)
unsigned numberOfFPArgumentRegisters = FPRInfo::numberOfArgumentRegisters;
unsigned currentFPArgCount = argSourceRegs.argCount(arg);
// MIPS can only use FP argument registers if it isn't preceeded by any GP argument.
if (currentFPArgCount < numberOfFPArgumentRegisters && !numGPRArgs) {
auto updatedArgSourceRegs = argSourceRegs.pushRegArg(arg, FPRInfo::toArgumentRegister(currentFPArgCount));
setupArgumentsImpl<OperationType>(updatedArgSourceRegs.addGPRExtraArg().addGPRExtraArg(), args...);
return;
}
#elif CPU(ARM_THUMB2) && CPU(ARM_HARDFP)
unsigned numberOfFPArgumentRegisters = FPRInfo::numberOfArgumentRegisters;
unsigned currentFPArgCount = argSourceRegs.argCount(arg);
if (currentFPArgCount < numberOfFPArgumentRegisters) {
auto updatedArgSourceRegs = argSourceRegs.pushRegArg(arg, FPRInfo::toArgumentRegister(currentFPArgCount));
setupArgumentsImpl<OperationType>(updatedArgSourceRegs, args...);
return;
}
#endif
#if CPU(MIPS) || (CPU(ARM_THUMB2) && !CPU(ARM_HARDFP))
// On MIPS and ARM-softfp FP arguments can be passed in GP registers.
unsigned numberOfGPArgumentRegisters = GPRInfo::numberOfArgumentRegisters;
unsigned currentGPArgCount = argSourceRegs.argCount(GPRInfo::regT0);
unsigned alignedGPArgCount = roundUpToMultipleOf<2>(currentGPArgCount);
if (alignedGPArgCount + 1 < numberOfGPArgumentRegisters) {
auto updatedArgSourceRegs = argSourceRegs.pushRegArg(arg, GPRInfo::toArgumentRegister(alignedGPArgCount));
if (alignedGPArgCount > currentGPArgCount)
setupArgumentsImpl<OperationType>(updatedArgSourceRegs.addGPRExtraArg().addGPRExtraArg().addGPRExtraArg(), args...);
else
setupArgumentsImpl<OperationType>(updatedArgSourceRegs.addGPRExtraArg().addGPRExtraArg(), args...);
return;
}
if (currentGPArgCount < numberOfGPArgumentRegisters) {
pokeForArgument(arg, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs + 1, extraPoke);
setupArgumentsImpl<OperationType>(argSourceRegs.addGPRExtraArg().addStackArg(arg).addPoke(), args...);
return;
}
#endif
// Otherwise pass FP argument on stack.
if (stackAligned(numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke)) {
pokeForArgument(arg, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke);
setupArgumentsImpl<OperationType>(argSourceRegs.addStackArg(arg).addPoke(), args...);
} else {
pokeForArgument(arg, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke + 1);
setupArgumentsImpl<OperationType>(argSourceRegs.addStackArg(arg).addPoke().addPoke(), args...);
}
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
std::enable_if_t<sizeof(CURRENT_ARGUMENT_TYPE) <= 4>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, GPRReg arg, Args... args)
{
unsigned numArgRegisters = GPRInfo::numberOfArgumentRegisters;
unsigned currentArgCount = argSourceRegs.argCount(arg);
if (currentArgCount < numArgRegisters) {
auto updatedArgSourceRegs = argSourceRegs.pushRegArg(arg, GPRInfo::toArgumentRegister(currentArgCount));
setupArgumentsImpl<OperationType>(updatedArgSourceRegs, args...);
return;
}
pokeForArgument(arg, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke);
setupArgumentsImpl<OperationType>(argSourceRegs.addStackArg(arg), args...);
}
template<typename OperationType, typename Arg1, typename Arg2, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
void pokeArgumentsAligned(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, Arg1 arg1, Arg2 arg2, Args... args)
{
unsigned numArgRegisters = GPRInfo::numberOfArgumentRegisters;
unsigned currentArgCount = argSourceRegs.argCount(GPRInfo::regT0);
if (currentArgCount + 1 == numArgRegisters) {
pokeForArgument(arg1, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs + 1, extraPoke);
pokeForArgument(arg2, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs + 1, extraPoke + 1);
setupArgumentsImpl<OperationType>(argSourceRegs.addGPRExtraArg().addGPRArg().addPoke(), args...);
} else if (stackAligned(numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke)) {
pokeForArgument(arg1, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke);
pokeForArgument(arg2, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke + 1);
setupArgumentsImpl<OperationType>(argSourceRegs.addGPRArg().addPoke(), args...);
} else {
pokeForArgument(arg1, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke + 1);
pokeForArgument(arg2, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke + 2);
setupArgumentsImpl<OperationType>(argSourceRegs.addGPRArg().addPoke().addPoke(), args...);
}
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
std::enable_if_t<std::is_same<CURRENT_ARGUMENT_TYPE, EncodedJSValue>::value>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, CellValue payload, Args... args)
{
unsigned numArgRegisters = GPRInfo::numberOfArgumentRegisters;
unsigned currentArgCount = argSourceRegs.argCount(payload.gpr());
unsigned alignedArgCount = roundUpToMultipleOf<2>(currentArgCount);
if (alignedArgCount + 1 < numArgRegisters) {
auto updatedArgSourceRegs = argSourceRegs.pushRegArg(payload.gpr(), GPRInfo::toArgumentRegister(alignedArgCount));
if (alignedArgCount > currentArgCount)
setupArgumentsImpl<OperationType>(updatedArgSourceRegs.addGPRExtraArg().addGPRExtraArg(), args...);
else
setupArgumentsImpl<OperationType>(updatedArgSourceRegs.addGPRExtraArg(), args...);
move(TrustedImm32(JSValue::CellTag), GPRInfo::toArgumentRegister(alignedArgCount + 1));
} else
pokeArgumentsAligned<OperationType>(argSourceRegs, payload.gpr(), TrustedImm32(JSValue::CellTag), args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename... Args>
std::enable_if_t<std::is_same<CURRENT_ARGUMENT_TYPE, EncodedJSValue>::value>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, JSValueRegs arg, Args... args)
{
unsigned numArgRegisters = GPRInfo::numberOfArgumentRegisters;
unsigned currentArgCount = argSourceRegs.argCount(arg.tagGPR());
unsigned alignedArgCount = roundUpToMultipleOf<2>(currentArgCount);
if (alignedArgCount + 1 < numArgRegisters) {
// JSValueRegs is passed in two 32-bit registers on these architectures. Increase both numGPRArgs and extraGPRArgs by 1.
// We can't just add 2 to numGPRArgs, since it is used for CURRENT_ARGUMENT_TYPE. Adding 2 would lead to a skipped argument.
auto updatedArgSourceRegs1 = argSourceRegs.pushRegArg(arg.payloadGPR(), GPRInfo::toArgumentRegister(alignedArgCount));
auto updatedArgSourceRegs2 = updatedArgSourceRegs1.pushExtraRegArg(arg.tagGPR(), GPRInfo::toArgumentRegister(alignedArgCount + 1));
if (alignedArgCount > currentArgCount)
setupArgumentsImpl<OperationType>(updatedArgSourceRegs2.addGPRExtraArg(), args...);
else
setupArgumentsImpl<OperationType>(updatedArgSourceRegs2, args...);
} else
pokeArgumentsAligned<OperationType>(argSourceRegs, arg.payloadGPR(), arg.tagGPR(), args...);
}
#endif // CPU(ARM_THUMB2) || CPU(MIPS)
#endif // USE(JSVALUE64)
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename Arg, typename... Args>
ALWAYS_INLINE std::enable_if_t<
std::is_base_of<TrustedImm, Arg>::value
|| std::is_convertible<Arg, TrustedImm>::value> // We have this since DFGSpeculativeJIT has it's own implementation of TrustedImmPtr
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, Arg arg, Args... args)
{
// Right now this only supports non-floating point immediate arguments since we never call operations with non-register values.
// If we ever needed to support immediate floating point arguments we would need to duplicate this logic for both types, which sounds
// gross so it's probably better to do that marshalling before the call operation...
static_assert(!std::is_floating_point<CURRENT_ARGUMENT_TYPE>::value, "We don't support immediate floats/doubles in setupArguments");
auto numArgRegisters = GPRInfo::numberOfArgumentRegisters;
#if OS(WINDOWS) && CPU(X86_64)
auto currentArgCount = numGPRArgs + numFPRArgs + (std::is_same<RESULT_TYPE, SlowPathReturnType>::value ? 1 : 0);
#else
auto currentArgCount = numGPRArgs + extraGPRArgs;
#endif
if (currentArgCount < numArgRegisters) {
setupArgumentsImpl<OperationType>(argSourceRegs.addGPRArg(), args...);
move(arg, GPRInfo::toArgumentRegister(currentArgCount));
return;
}
pokeForArgument(arg, numGPRArgs, numFPRArgs, numCrossSources, extraGPRArgs, extraPoke);
setupArgumentsImpl<OperationType>(argSourceRegs.addGPRArg(), args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename Arg, typename... Args>
ALWAYS_INLINE std::enable_if_t<
std::is_same<CURRENT_ARGUMENT_TYPE, Arg>::value
&& std::is_integral<CURRENT_ARGUMENT_TYPE>::value
&& (sizeof(CURRENT_ARGUMENT_TYPE) <= 4)>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, Arg arg, Args... args)
{
setupArgumentsImpl<OperationType>(argSourceRegs, TrustedImm32(arg), args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename Arg, typename... Args>
ALWAYS_INLINE std::enable_if_t<
std::is_same<CURRENT_ARGUMENT_TYPE, Arg>::value
&& std::is_integral<CURRENT_ARGUMENT_TYPE>::value
&& (sizeof(CURRENT_ARGUMENT_TYPE) == 8)>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, Arg arg, Args... args)
{
setupArgumentsImpl<OperationType>(argSourceRegs, TrustedImm64(arg), args...);
}
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename Arg, typename... Args>
ALWAYS_INLINE std::enable_if_t<
std::is_pointer<CURRENT_ARGUMENT_TYPE>::value
&& ((std::is_pointer<Arg>::value && std::is_convertible<std::remove_const_t<std::remove_pointer_t<Arg>>*, CURRENT_ARGUMENT_TYPE>::value)
|| std::is_same<Arg, std::nullptr_t>::value)>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, Arg arg, Args... args)
{
setupArgumentsImpl<OperationType>(argSourceRegs, TrustedImmPtr(arg), args...);
}
// Special case DFG::RegisteredStructure because it's really annoying to deal with otherwise...
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke, typename Arg, typename... Args>
ALWAYS_INLINE std::enable_if_t<
std::is_same<CURRENT_ARGUMENT_TYPE, Structure*>::value
&& std::is_same<Arg, DFG::RegisteredStructure>::value>
setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs, Arg arg, Args... args)
{
setupArgumentsImpl<OperationType>(argSourceRegs, TrustedImmPtr(arg.get()), args...);
}
#undef CURRENT_ARGUMENT_TYPE
#undef RESULT_TYPE
// Base case; set up the argument registers.
template<typename OperationType, unsigned numGPRArgs, unsigned numGPRSources, unsigned numFPRArgs, unsigned numFPRSources, unsigned numCrossSources, unsigned extraGPRArgs, unsigned extraPoke>
ALWAYS_INLINE void setupArgumentsImpl(ArgCollection<numGPRArgs, numGPRSources, numFPRArgs, numFPRSources, numCrossSources, extraGPRArgs, extraPoke> argSourceRegs)
{
static_assert(FunctionTraits<OperationType>::arity == numGPRArgs + numFPRArgs, "One last sanity check");
#if USE(JSVALUE64)
static_assert(FunctionTraits<OperationType>::cCallArity() == numGPRArgs + numFPRArgs + extraPoke, "Check the CCall arity");
#endif
setupStubArgs<numGPRSources, GPRReg>(clampArrayToSize<numGPRSources, GPRReg>(argSourceRegs.gprDestinations), clampArrayToSize<numGPRSources, GPRReg>(argSourceRegs.gprSources));
#if CPU(MIPS) || (CPU(ARM_THUMB2) && !CPU(ARM_HARDFP))
setupStubCrossArgs<numCrossSources>(argSourceRegs.crossDestinations, argSourceRegs.crossSources);
#else
static_assert(!numCrossSources, "shouldn't be used on this architecture.");
#endif
setupStubArgs<numFPRSources, FPRReg>(clampArrayToSize<numFPRSources, FPRReg>(argSourceRegs.fprDestinations), clampArrayToSize<numFPRSources, FPRReg>(argSourceRegs.fprSources));
}
public:
#define FIRST_ARGUMENT_TYPE typename FunctionTraits<OperationType>::template ArgumentType<0>
template<typename OperationType, typename... Args>
ALWAYS_INLINE std::enable_if_t<std::is_same<FIRST_ARGUMENT_TYPE, CallFrame*>::value> setupArguments(Args... args)
{
#if USE(JSVALUE64)
// This only really works for 64-bit since jsvalue regs mess things up for 32-bit...
static_assert(FunctionTraits<OperationType>::cCallArity() == sizeof...(Args) + 1, "Basic sanity check");
#endif
setupArgumentsImpl<OperationType, 0, 0, 0, 0, 0, 0, 0>(ArgCollection<0, 0, 0, 0, 0, 0, 0>(), GPRInfo::callFrameRegister, args...);
}
template<typename OperationType, typename... Args>
ALWAYS_INLINE std::enable_if_t<!std::is_same<FIRST_ARGUMENT_TYPE, CallFrame*>::value> setupArguments(Args... args)
{
#if USE(JSVALUE64)
// This only really works for 64-bit since jsvalue regs mess things up for 32-bit...
static_assert(FunctionTraits<OperationType>::cCallArity() == sizeof...(Args), "Basic sanity check");
#endif
setupArgumentsImpl<OperationType, 0, 0, 0, 0, 0, 0, 0>(ArgCollection<0, 0, 0, 0, 0, 0, 0>(), args...);
}
#undef FIRST_ARGUMENT_TYPE
void setupResults(GPRReg destA, GPRReg destB)
{
GPRReg srcA = GPRInfo::returnValueGPR;
GPRReg srcB = GPRInfo::returnValueGPR2;
if (destA == InvalidGPRReg)
move(srcB, destB);
else if (destB == InvalidGPRReg)
move(srcA, destA);
else if (srcB != destA) {
// Handle the easy cases - two simple moves.
move(srcA, destA);
move(srcB, destB);
} else if (srcA != destB) {
// Handle the non-swap case - just put srcB in place first.
move(srcB, destB);
move(srcA, destA);
} else
swap(destA, destB);
}
void setupResults(JSValueRegs regs)
{
#if USE(JSVALUE64)
move(GPRInfo::returnValueGPR, regs.gpr());
#else
setupResults(regs.payloadGPR(), regs.tagGPR());
#endif
}
void jumpToExceptionHandler(VM& vm)
{
// genericUnwind() leaves the handler CallFrame* in vm->callFrameForCatch,
// and the address of the handler in vm->targetMachinePCForThrow.
loadPtr(&vm.targetMachinePCForThrow, GPRInfo::regT1);
farJump(GPRInfo::regT1, ExceptionHandlerPtrTag);
}
void prepareForTailCallSlow(GPRReg calleeGPR = InvalidGPRReg)
{
GPRReg temp1 = calleeGPR == GPRInfo::regT0 ? GPRInfo::regT3 : GPRInfo::regT0;
GPRReg temp2 = calleeGPR == GPRInfo::regT1 ? GPRInfo::regT3 : GPRInfo::regT1;
GPRReg temp3 = calleeGPR == GPRInfo::regT2 ? GPRInfo::regT3 : GPRInfo::regT2;
GPRReg newFramePointer = temp1;
GPRReg newFrameSizeGPR = temp2;
{
// The old frame size is its number of arguments (or number of
// parameters in case of arity fixup), plus the frame header size,
// aligned
GPRReg oldFrameSizeGPR = temp2;
{
GPRReg argCountGPR = oldFrameSizeGPR;
load32(Address(framePointerRegister, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset), argCountGPR);
{
GPRReg numParametersGPR = temp1;
{
GPRReg codeBlockGPR = numParametersGPR;
loadPtr(Address(framePointerRegister, CallFrameSlot::codeBlock * static_cast<int>(sizeof(Register))), codeBlockGPR);
load32(Address(codeBlockGPR, CodeBlock::offsetOfNumParameters()), numParametersGPR);
}
ASSERT(numParametersGPR != argCountGPR);
Jump argumentCountWasNotFixedUp = branch32(BelowOrEqual, numParametersGPR, argCountGPR);
move(numParametersGPR, argCountGPR);
argumentCountWasNotFixedUp.link(this);
}
add32(TrustedImm32(stackAlignmentRegisters() + CallFrame::headerSizeInRegisters - 1), argCountGPR, oldFrameSizeGPR);
and32(TrustedImm32(-stackAlignmentRegisters()), oldFrameSizeGPR);
// We assume < 2^28 arguments
mul32(TrustedImm32(sizeof(Register)), oldFrameSizeGPR, oldFrameSizeGPR);
}
// The new frame pointer is at framePointer + oldFrameSize - newFrameSize
ASSERT(newFramePointer != oldFrameSizeGPR);
addPtr(framePointerRegister, oldFrameSizeGPR, newFramePointer);
// The new frame size is just the number of arguments plus the
// frame header size, aligned
ASSERT(newFrameSizeGPR != newFramePointer);
load32(Address(stackPointerRegister, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC)),
newFrameSizeGPR);
add32(TrustedImm32(stackAlignmentRegisters() + CallFrame::headerSizeInRegisters - 1), newFrameSizeGPR);
and32(TrustedImm32(-stackAlignmentRegisters()), newFrameSizeGPR);
// We assume < 2^28 arguments
mul32(TrustedImm32(sizeof(Register)), newFrameSizeGPR, newFrameSizeGPR);
}
GPRReg tempGPR = temp3;
ASSERT(tempGPR != newFramePointer && tempGPR != newFrameSizeGPR);
// We don't need the current frame beyond this point. Masquerade as our
// caller.
#if CPU(ARM_THUMB2) || CPU(ARM64)
loadPtr(Address(framePointerRegister, CallFrame::returnPCOffset()), linkRegister);
subPtr(TrustedImm32(2 * sizeof(void*)), newFrameSizeGPR);
#if CPU(ARM64E)
addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), MacroAssembler::framePointerRegister, tempGPR);
untagPtr(tempGPR, linkRegister);
validateUntaggedPtr(linkRegister, tempGPR);
#endif
#elif CPU(MIPS)
loadPtr(Address(framePointerRegister, sizeof(void*)), returnAddressRegister);
subPtr(TrustedImm32(2 * sizeof(void*)), newFrameSizeGPR);
#elif CPU(X86_64)
loadPtr(Address(framePointerRegister, sizeof(void*)), tempGPR);
push(tempGPR);
subPtr(TrustedImm32(sizeof(void*)), newFrameSizeGPR);
#else
UNREACHABLE_FOR_PLATFORM();
#endif
subPtr(newFrameSizeGPR, newFramePointer);
loadPtr(Address(framePointerRegister), framePointerRegister);
// We need to move the newFrameSizeGPR slots above the stack pointer by
// newFramePointer registers. We use pointer-sized chunks.
MacroAssembler::Label copyLoop(label());
subPtr(TrustedImm32(sizeof(void*)), newFrameSizeGPR);
loadPtr(BaseIndex(stackPointerRegister, newFrameSizeGPR, TimesOne), tempGPR);
storePtr(tempGPR, BaseIndex(newFramePointer, newFrameSizeGPR, TimesOne));
branchTest32(MacroAssembler::NonZero, newFrameSizeGPR).linkTo(copyLoop, this);
// Ready for a jump!
move(newFramePointer, stackPointerRegister);
}
// These operations clobber all volatile registers. They assume that there is room on the top of
// stack to marshall call arguments.
void logShadowChickenProloguePacket(GPRReg shadowPacket, GPRReg scratch1, GPRReg scope);
void logShadowChickenTailPacket(GPRReg shadowPacket, JSValueRegs thisRegs, GPRReg scope, CodeBlock*, CallSiteIndex);
// Leaves behind a pointer to the Packet we should write to in shadowPacket.
void ensureShadowChickenPacket(VM&, GPRReg shadowPacket, GPRReg scratch1NonArgGPR, GPRReg scratch2);
};
} // namespace JSC
#endif // ENABLE(JIT)
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