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/*
* Copyright (C) 2011, 2014 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 "DFGThunks.h"
#if ENABLE(DFG_JIT)
#include "CCallHelpers.h"
#include "DFGOSRExitCompiler.h"
#include "DFGJITCode.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "LinkBuffer.h"
#include "MacroAssembler.h"
#include "JSCInlines.h"
#include "DFGOSRExitCompilerCommon.h"
namespace JSC { namespace DFG {
MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM* vm)
{
MacroAssembler jit;
// This needs to happen before we use the scratch buffer because this function also uses the scratch buffer.
adjustFrameAndStackInOSRExitCompilerThunk<DFG::JITCode>(jit, vm, JITCode::DFGJIT);
size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(scratchSize);
EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
jit.store64(GPRInfo::toRegister(i), buffer + i);
#else
jit.store32(GPRInfo::toRegister(i), buffer + i);
#endif
}
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
jit.storeDouble(FPRInfo::toRegister(i), MacroAssembler::Address(GPRInfo::regT0));
}
// Tell GC mark phase how much of the scratch buffer is active during call.
jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), MacroAssembler::Address(GPRInfo::regT0));
// Set up one argument.
#if CPU(X86)
jit.poke(GPRInfo::callFrameRegister, 0);
#else
jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
#endif
MacroAssembler::Call functionCall = jit.call();
jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
jit.storePtr(MacroAssembler::TrustedImmPtr(0), MacroAssembler::Address(GPRInfo::regT0));
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
jit.loadDouble(MacroAssembler::Address(GPRInfo::regT0), FPRInfo::toRegister(i));
}
for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
jit.load64(buffer + i, GPRInfo::toRegister(i));
#else
jit.load32(buffer + i, GPRInfo::toRegister(i));
#endif
}
jit.jump(MacroAssembler::AbsoluteAddress(&vm->osrExitJumpDestination));
LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
patchBuffer.link(functionCall, compileOSRExit);
return FINALIZE_CODE(patchBuffer, ("DFG OSR exit generation thunk"));
}
MacroAssemblerCodeRef osrEntryThunkGenerator(VM* vm)
{
AssemblyHelpers jit(vm, nullptr);
// We get passed the address of a scratch buffer. The first 8-byte slot of the buffer
// is the frame size. The second 8-byte slot is the pointer to where we are supposed to
// jump. The remaining bytes are the new call frame header followed by the locals.
ptrdiff_t offsetOfFrameSize = 0; // This is the DFG frame count.
ptrdiff_t offsetOfTargetPC = offsetOfFrameSize + sizeof(EncodedJSValue);
ptrdiff_t offsetOfPayload = offsetOfTargetPC + sizeof(EncodedJSValue);
ptrdiff_t offsetOfLocals = offsetOfPayload + sizeof(Register) * JSStack::CallFrameHeaderSize;
jit.move(GPRInfo::returnValueGPR2, GPRInfo::regT0);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfFrameSize), GPRInfo::regT1); // Load the frame size.
jit.move(GPRInfo::regT1, GPRInfo::regT2);
jit.lshiftPtr(MacroAssembler::Imm32(3), GPRInfo::regT2);
jit.move(GPRInfo::callFrameRegister, MacroAssembler::stackPointerRegister);
jit.subPtr(GPRInfo::regT2, MacroAssembler::stackPointerRegister);
MacroAssembler::Label loop = jit.label();
jit.subPtr(MacroAssembler::TrustedImm32(1), GPRInfo::regT1);
jit.move(GPRInfo::regT1, GPRInfo::regT4);
jit.negPtr(GPRInfo::regT4);
jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals), GPRInfo::regT2);
jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals + sizeof(int32_t)), GPRInfo::regT3);
jit.store32(GPRInfo::regT2, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register))));
jit.store32(GPRInfo::regT3, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register)) + static_cast<intptr_t>(sizeof(int32_t))));
jit.branchPtr(MacroAssembler::NotEqual, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(-static_cast<intptr_t>(JSStack::CallFrameHeaderSize)))).linkTo(loop, &jit);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfTargetPC), GPRInfo::regT1);
MacroAssembler::Jump ok = jit.branchPtr(MacroAssembler::Above, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(static_cast<intptr_t>(1000))));
jit.abortWithReason(DFGUnreasonableOSREntryJumpDestination);
ok.link(&jit);
jit.restoreCalleeSavesFromVMCalleeSavesBuffer();
jit.emitMaterializeTagCheckRegisters();
jit.jump(GPRInfo::regT1);
LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, ("DFG OSR entry thunk"));
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
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