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/*
* Copyright (C) 2016 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(WEBASSEMBLY)
#include "AllowMacroScratchRegisterUsage.h"
#include "B3ArgumentRegValue.h"
#include "B3BasicBlock.h"
#include "B3Const64Value.h"
#include "B3ConstrainedValue.h"
#include "B3MemoryValue.h"
#include "B3PatchpointValue.h"
#include "B3Procedure.h"
#include "B3StackmapGenerationParams.h"
#include "CallFrame.h"
#include "LinkBuffer.h"
#include "RegisterSet.h"
#include "WasmFormat.h"
namespace JSC { namespace Wasm {
typedef unsigned (*NextOffset)(unsigned currentOffset, B3::Type type);
template<unsigned headerSize, NextOffset updateOffset>
class CallingConvention {
public:
CallingConvention(Vector<Reg>&& gprArgs, Vector<Reg>&& fprArgs, RegisterSet&& calleeSaveRegisters)
: m_gprArgs(gprArgs)
, m_fprArgs(fprArgs)
, m_calleeSaveRegisters(calleeSaveRegisters)
{
}
private:
B3::ValueRep marshallArgumentImpl(Vector<Reg> regArgs, B3::Type type, size_t& count, size_t& stackOffset) const
{
if (count < regArgs.size())
return B3::ValueRep::reg(regArgs[count++]);
count++;
B3::ValueRep result = B3::ValueRep::stackArgument(stackOffset);
stackOffset = updateOffset(stackOffset, type);
return result;
}
B3::ValueRep marshallArgument(B3::Type type, size_t& gpArgumentCount, size_t& fpArgumentCount, size_t& stackOffset) const
{
switch (type) {
case B3::Int32:
case B3::Int64:
return marshallArgumentImpl(m_gprArgs, type, gpArgumentCount, stackOffset);
case B3::Float:
case B3::Double:
return marshallArgumentImpl(m_fprArgs, type, fpArgumentCount, stackOffset);
case B3::Void:
break;
}
RELEASE_ASSERT_NOT_REACHED();
}
public:
void setupFrameInPrologue(CodeLocationDataLabelPtr* calleeMoveLocation, B3::Procedure& proc, B3::Origin origin, B3::BasicBlock* block) const
{
static_assert(CallFrameSlot::callee * sizeof(Register) < headerSize, "We rely on this here for now.");
static_assert(CallFrameSlot::codeBlock * sizeof(Register) < headerSize, "We rely on this here for now.");
B3::PatchpointValue* getCalleePatchpoint = block->appendNew<B3::PatchpointValue>(proc, B3::Int64, origin);
getCalleePatchpoint->resultConstraint = B3::ValueRep::SomeRegister;
getCalleePatchpoint->effects = B3::Effects::none();
getCalleePatchpoint->setGenerator(
[=] (CCallHelpers& jit, const B3::StackmapGenerationParams& params) {
GPRReg result = params[0].gpr();
MacroAssembler::DataLabelPtr moveLocation = jit.moveWithPatch(MacroAssembler::TrustedImmPtr(nullptr), result);
jit.addLinkTask([calleeMoveLocation, moveLocation] (LinkBuffer& linkBuffer) {
*calleeMoveLocation = linkBuffer.locationOf(moveLocation);
});
});
B3::Value* framePointer = block->appendNew<B3::Value>(proc, B3::FramePointer, origin);
B3::Value* offsetOfCallee = block->appendNew<B3::Const64Value>(proc, origin, CallFrameSlot::callee * sizeof(Register));
block->appendNew<B3::MemoryValue>(proc, B3::Store, origin,
getCalleePatchpoint,
block->appendNew<B3::Value>(proc, B3::Add, origin, framePointer, offsetOfCallee));
// FIXME: We shouldn't have to store zero into the CodeBlock* spot in the call frame,
// but there are places that interpret non-null CodeBlock slot to mean a valid CodeBlock.
// When doing unwinding, we'll need to verify that the entire runtime is OK with a non-null
// CodeBlock not implying that the CodeBlock is valid.
// https://bugs.webkit.org/show_bug.cgi?id=165321
B3::Value* offsetOfCodeBlock = block->appendNew<B3::Const64Value>(proc, origin, CallFrameSlot::codeBlock * sizeof(Register));
block->appendNew<B3::MemoryValue>(proc, B3::Store, origin,
block->appendNew<B3::Const64Value>(proc, origin, 0),
block->appendNew<B3::Value>(proc, B3::Add, origin, framePointer, offsetOfCodeBlock));
}
template<typename Functor>
void loadArguments(const Signature* signature, B3::Procedure& proc, B3::BasicBlock* block, B3::Origin origin, const Functor& functor) const
{
B3::Value* framePointer = block->appendNew<B3::Value>(proc, B3::FramePointer, origin);
size_t gpArgumentCount = 0;
size_t fpArgumentCount = 0;
size_t stackOffset = headerSize;
for (size_t i = 0; i < signature->argumentCount(); ++i) {
B3::Type type = toB3Type(signature->argument(i));
B3::Value* argument;
B3::ValueRep rep = marshallArgument(type, gpArgumentCount, fpArgumentCount, stackOffset);
if (rep.isReg()) {
argument = block->appendNew<B3::ArgumentRegValue>(proc, origin, rep.reg());
if (type == B3::Int32 || type == B3::Float)
argument = block->appendNew<B3::Value>(proc, B3::Trunc, origin, argument);
} else {
ASSERT(rep.isStackArgument());
B3::Value* address = block->appendNew<B3::Value>(proc, B3::Add, origin, framePointer,
block->appendNew<B3::Const64Value>(proc, origin, rep.offsetFromSP()));
argument = block->appendNew<B3::MemoryValue>(proc, B3::Load, type, origin, address);
}
functor(argument, i);
}
}
// It's expected that the pachpointFunctor sets the generator for the call operation.
template<typename Functor>
B3::Value* setupCall(B3::Procedure& proc, B3::BasicBlock* block, B3::Origin origin, const Vector<B3::Value*>& arguments, B3::Type returnType, const Functor& patchpointFunctor) const
{
size_t gpArgumentCount = 0;
size_t fpArgumentCount = 0;
size_t stackOffset = headerSize - sizeof(CallerFrameAndPC);
Vector<B3::ConstrainedValue> constrainedArguments;
for (B3::Value* argument : arguments) {
B3::ValueRep rep = marshallArgument(argument->type(), gpArgumentCount, fpArgumentCount, stackOffset);
constrainedArguments.append(B3::ConstrainedValue(argument, rep));
}
proc.requestCallArgAreaSizeInBytes(WTF::roundUpToMultipleOf(stackAlignmentBytes(), stackOffset));
B3::PatchpointValue* patchpoint = block->appendNew<B3::PatchpointValue>(proc, returnType, origin);
patchpoint->clobberEarly(RegisterSet::macroScratchRegisters());
patchpoint->clobberLate(RegisterSet::volatileRegistersForJSCall());
patchpointFunctor(patchpoint);
patchpoint->appendVector(constrainedArguments);
switch (returnType) {
case B3::Void:
return nullptr;
case B3::Float:
case B3::Double:
patchpoint->resultConstraint = B3::ValueRep::reg(FPRInfo::returnValueFPR);
break;
case B3::Int32:
case B3::Int64:
patchpoint->resultConstraint = B3::ValueRep::reg(GPRInfo::returnValueGPR);
break;
}
return patchpoint;
}
const Vector<Reg> m_gprArgs;
const Vector<Reg> m_fprArgs;
const RegisterSet m_calleeSaveRegisters;
const RegisterSet m_callerSaveRegisters;
};
inline unsigned nextJSCOffset(unsigned currentOffset, B3::Type)
{
return currentOffset + sizeof(Register);
}
constexpr unsigned jscHeaderSize = ExecState::headerSizeInRegisters * sizeof(Register);
typedef CallingConvention<jscHeaderSize, nextJSCOffset> JSCCallingConvention;
typedef JSCCallingConvention WasmCallingConvention;
const JSCCallingConvention& jscCallingConvention();
const WasmCallingConvention& wasmCallingConvention();
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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