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/*
* Copyright (C) 2021-2022 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 "SlowPathCall.h"
#if ENABLE(JIT)
#include "CCallHelpers.h"
#include "JITInlines.h"
#include "JITThunks.h"
#include "ThunkGenerators.h"
#include "VM.h"
namespace JSC {
namespace {
constexpr GPRReg bytecodeOffsetGPR = JIT::argumentGPR3;
}
void JITSlowPathCall::call()
{
VM& vm = m_jit->vm();
uint32_t bytecodeOffset = m_jit->m_bytecodeIndex.offset();
ASSERT(BytecodeIndex(bytecodeOffset) == m_jit->m_bytecodeIndex);
m_jit->move(JIT::TrustedImm32(bytecodeOffset), bytecodeOffsetGPR);
m_jit->nearCallThunk(CodeLocationLabel { vm.jitStubs->ctiSlowPathFunctionStub(vm, m_slowPathFunction).retaggedCode<NoPtrTag>() });
}
MacroAssemblerCodeRef<JITThunkPtrTag> JITSlowPathCall::generateThunk(VM& vm, SlowPathFunction slowPathFunction)
{
CCallHelpers jit;
jit.emitCTIThunkPrologue();
// Call slow operation
jit.store32(bytecodeOffsetGPR, CCallHelpers::tagFor(CallFrameSlot::argumentCountIncludingThis));
jit.prepareCallOperation(vm);
#if OS(WINDOWS) && CPU(X86_64)
// On Windows, return values larger than 8 bytes are retuened via an implicit pointer passed as
// the first argument, and remaining arguments are shifted to the right. Make space for this.
static_assert(sizeof(UGPRPair) == 16, "Assumed by generated call site below");
jit.subPtr(MacroAssembler::TrustedImm32(16), MacroAssembler::stackPointerRegister);
jit.move(MacroAssembler::stackPointerRegister, GPRInfo::argumentGPR0);
constexpr GPRReg callFrameArgGPR = GPRInfo::argumentGPR1;
constexpr GPRReg pcArgGPR = GPRInfo::argumentGPR2;
static_assert(noOverlap(GPRInfo::argumentGPR0, callFrameArgGPR, pcArgGPR, bytecodeOffsetGPR));
#else
constexpr GPRReg callFrameArgGPR = GPRInfo::argumentGPR0;
constexpr GPRReg pcArgGPR = GPRInfo::argumentGPR1;
static_assert(noOverlap(callFrameArgGPR, pcArgGPR, bytecodeOffsetGPR));
#endif
jit.move(GPRInfo::callFrameRegister, callFrameArgGPR);
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::codeBlock), pcArgGPR);
jit.loadPtr(CCallHelpers::Address(pcArgGPR, CodeBlock::offsetOfInstructionsRawPointer()), pcArgGPR);
jit.addPtr(bytecodeOffsetGPR, pcArgGPR);
jit.callOperation<OperationPtrTag>(slowPathFunction);
#if OS(WINDOWS) && CPU(X86_64)
jit.pop(GPRInfo::returnValueGPR); // pc
jit.pop(GPRInfo::returnValueGPR2); // callFrame
#endif
jit.emitCTIThunkEpilogue();
// Tail call to exception check thunk
jit.jumpThunk(CodeLocationLabel(vm.getCTIStub(CommonJITThunkID::CheckException).retaggedCode<NoPtrTag>()));
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::ExtraCTIThunk);
return FINALIZE_THUNK(patchBuffer, JITThunkPtrTag, "SlowPathCall");
}
} // namespace JSC
#endif // ENABLE(JIT)
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