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/*
* Copyright (C) 2013 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 "FTLLink.h"
#if ENABLE(FTL_JIT)
#include "CCallHelpers.h"
#include "CallFrameInlines.h"
#include "CodeBlockWithJITType.h"
#include "DFGCommon.h"
#include "FTLJITCode.h"
#include "JITOperations.h"
#include "JITStubs.h"
#include "LLVMAPI.h"
#include "LinkBuffer.h"
#include "VirtualRegister.h"
namespace JSC { namespace FTL {
using namespace DFG;
static void compileEntry(CCallHelpers& jit)
{
jit.preserveReturnAddressAfterCall(GPRInfo::regT2);
jit.emitPutReturnPCToCallFrameHeader(GPRInfo::regT2);
jit.emitPutImmediateToCallFrameHeader(jit.codeBlock(), JSStack::CodeBlock);
}
void link(State& state)
{
CodeBlock* codeBlock = state.graph.m_codeBlock;
// LLVM will create its own jump tables as needed.
codeBlock->clearSwitchJumpTables();
state.jitCode->common.frameRegisterCount = state.graph.frameRegisterCount();
state.jitCode->common.requiredRegisterCountForExit = state.graph.requiredRegisterCountForExit();
if (!state.graph.m_inlineCallFrames->isEmpty())
state.jitCode->common.inlineCallFrames = std::move(state.graph.m_inlineCallFrames);
// Create the entrypoint. Note that we use this entrypoint totally differently
// depending on whether we're doing OSR entry or not.
// FIXME: Except for OSR entry, this is a total kludge - LLVM should just use our
// calling convention.
// https://bugs.webkit.org/show_bug.cgi?id=113621
CCallHelpers jit(&state.graph.m_vm, codeBlock);
OwnPtr<LinkBuffer> linkBuffer;
CCallHelpers::Label arityCheck;
switch (state.graph.m_plan.mode) {
case FTLMode: {
compileEntry(jit);
// This part is only necessary for functions. We currently only compile functions.
CCallHelpers::Label fromArityCheck = jit.label();
// Plant a check that sufficient space is available in the JSStack.
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=56291
jit.addPtr(
CCallHelpers::TrustedImm32(virtualRegisterForLocal(state.jitCode->common.requiredRegisterCountForExit).offset() * sizeof(Register)),
GPRInfo::callFrameRegister, GPRInfo::regT1);
CCallHelpers::Jump stackCheck = jit.branchPtr(
CCallHelpers::Above,
CCallHelpers::AbsoluteAddress(state.graph.m_vm.addressOfJSStackLimit()),
GPRInfo::regT1);
CCallHelpers::Label fromStackCheck = jit.label();
jit.setupArgumentsExecState();
jit.move(
CCallHelpers::TrustedImmPtr(reinterpret_cast<void*>(state.generatedFunction)),
GPRInfo::nonArgGPR0);
jit.call(GPRInfo::nonArgGPR0);
jit.emitGetReturnPCFromCallFrameHeaderPtr(GPRInfo::regT1);
jit.emitGetCallerFrameFromCallFrameHeaderPtr(GPRInfo::callFrameRegister);
jit.restoreReturnAddressBeforeReturn(GPRInfo::regT1);
jit.ret();
stackCheck.link(&jit);
jit.move(CCallHelpers::TrustedImmPtr(codeBlock), GPRInfo::argumentGPR1);
jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
jit.store32(
CCallHelpers::TrustedImm32(CallFrame::Location::encodeAsBytecodeOffset(0)),
CCallHelpers::tagFor(static_cast<VirtualRegister>(JSStack::ArgumentCount)));
jit.storePtr(GPRInfo::callFrameRegister, &state.graph.m_vm.topCallFrame);
CCallHelpers::Call callStackCheck = jit.call();
#if !ASSERT_DISABLED
// FIXME: need to make this call register with exception handling somehow. This is
// part of a bigger problem: FTL should be able to handle exceptions.
// https://bugs.webkit.org/show_bug.cgi?id=113622
// Until then, use a JIT ASSERT.
jit.load64(state.graph.m_vm.addressOfException(), GPRInfo::regT0);
jit.jitAssertIsNull(GPRInfo::regT0);
#endif
jit.jump(fromStackCheck);
arityCheck = jit.label();
compileEntry(jit);
jit.load32(
CCallHelpers::payloadFor(static_cast<VirtualRegister>(JSStack::ArgumentCount)),
GPRInfo::regT1);
jit.branch32(
CCallHelpers::AboveOrEqual, GPRInfo::regT1,
CCallHelpers::TrustedImm32(codeBlock->numParameters()))
.linkTo(fromArityCheck, &jit);
jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
jit.store32(
CCallHelpers::TrustedImm32(CallFrame::Location::encodeAsBytecodeOffset(0)),
CCallHelpers::tagFor(static_cast<VirtualRegister>(JSStack::ArgumentCount)));
jit.storePtr(GPRInfo::callFrameRegister, &state.graph.m_vm.topCallFrame);
CCallHelpers::Call callArityCheck = jit.call();
#if !ASSERT_DISABLED
// FIXME: need to make this call register with exception handling somehow. This is
// part of a bigger problem: FTL should be able to handle exceptions.
// https://bugs.webkit.org/show_bug.cgi?id=113622
// Until then, use a JIT ASSERT.
jit.load64(state.graph.m_vm.addressOfException(), GPRInfo::regT1);
jit.jitAssertIsNull(GPRInfo::regT1);
#endif
if (GPRInfo::returnValueGPR != GPRInfo::regT0)
jit.move(GPRInfo::returnValueGPR, GPRInfo::regT0);
jit.branchTest32(CCallHelpers::Zero, GPRInfo::regT0).linkTo(fromArityCheck, &jit);
CCallHelpers::Call callArityFixup = jit.call();
jit.jump(fromArityCheck);
linkBuffer = adoptPtr(new LinkBuffer(state.graph.m_vm, &jit, codeBlock, JITCompilationMustSucceed));
linkBuffer->link(callStackCheck, operationStackCheck);
linkBuffer->link(callArityCheck, codeBlock->m_isConstructor ? operationConstructArityCheck : operationCallArityCheck);
linkBuffer->link(callArityFixup, FunctionPtr((state.graph.m_vm.getCTIStub(arityFixup)).code().executableAddress()));
break;
}
case FTLForOSREntryMode: {
// We jump to here straight from DFG code, after having boxed up all of the
// values into the scratch buffer. Everything should be good to go - at this
// point we've even done the stack check. Basically we just have to make the
// call to the LLVM-generated code.
jit.setupArgumentsExecState();
jit.move(
CCallHelpers::TrustedImmPtr(reinterpret_cast<void*>(state.generatedFunction)),
GPRInfo::nonArgGPR0);
jit.call(GPRInfo::nonArgGPR0);
jit.emitGetReturnPCFromCallFrameHeaderPtr(GPRInfo::regT1);
jit.emitGetCallerFrameFromCallFrameHeaderPtr(GPRInfo::callFrameRegister);
jit.restoreReturnAddressBeforeReturn(GPRInfo::regT1);
jit.ret();
linkBuffer = adoptPtr(new LinkBuffer(
state.graph.m_vm, &jit, codeBlock, JITCompilationMustSucceed));
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
state.finalizer->entrypointLinkBuffer = linkBuffer.release();
state.finalizer->function = state.generatedFunction;
state.finalizer->arityCheck = arityCheck;
state.finalizer->jitCode = state.jitCode;
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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