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/*
* Copyright (C) 2011-2019 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(DFG_JIT)
#include "CCallHelpers.h"
#include "CodeBlock.h"
#include "DFGDisassembler.h"
#include "DFGGraph.h"
#include "DFGInlineCacheWrapper.h"
#include "DFGJITCode.h"
#include "DFGOSRExitCompilationInfo.h"
#include "GPRInfo.h"
#include "HandlerInfo.h"
#include "JITCode.h"
#include "JITInlineCacheGenerator.h"
#include "LinkBuffer.h"
#include "MacroAssembler.h"
#include "PCToCodeOriginMap.h"
namespace JSC {
class AbstractSamplingCounter;
class CodeBlock;
class VM;
namespace DFG {
class JITCodeGenerator;
class NodeToRegisterMap;
class OSRExitJumpPlaceholder;
class SlowPathGenerator;
class SpeculativeJIT;
class SpeculationRecovery;
struct EntryLocation;
struct OSRExit;
// === CallLinkRecord ===
//
// A record of a call out from JIT code that needs linking to a helper function.
// Every CallLinkRecord contains a reference to the call instruction & the function
// that it needs to be linked to.
struct CallLinkRecord {
CallLinkRecord(MacroAssembler::Call call, FunctionPtr<OperationPtrTag> function)
: m_call(call)
, m_function(function)
{
}
MacroAssembler::Call m_call;
FunctionPtr<OperationPtrTag> m_function;
};
// === JITCompiler ===
//
// DFG::JITCompiler is responsible for generating JIT code from the dataflow graph.
// It does so by delegating to the speculative & non-speculative JITs, which
// generate to a MacroAssembler (which the JITCompiler owns through an inheritance
// relationship). The JITCompiler holds references to information required during
// compilation, and also records information used in linking (e.g. a list of all
// call to be linked).
class JITCompiler : public CCallHelpers {
public:
JITCompiler(Graph& dfg);
~JITCompiler();
void compile();
void compileFunction();
// Accessors for properties.
Graph& graph() { return m_graph; }
// Methods to set labels for the disassembler.
void setStartOfCode()
{
m_pcToCodeOriginMapBuilder.appendItem(labelIgnoringWatchpoints(), CodeOrigin(0, nullptr));
if (LIKELY(!m_disassembler))
return;
m_disassembler->setStartOfCode(labelIgnoringWatchpoints());
}
void setForBlockIndex(BlockIndex blockIndex)
{
if (LIKELY(!m_disassembler))
return;
m_disassembler->setForBlockIndex(blockIndex, labelIgnoringWatchpoints());
}
void setForNode(Node* node)
{
if (LIKELY(!m_disassembler))
return;
m_disassembler->setForNode(node, labelIgnoringWatchpoints());
}
void setEndOfMainPath();
void setEndOfCode();
CallSiteIndex addCallSite(CodeOrigin codeOrigin)
{
return m_jitCode->common.addCodeOrigin(codeOrigin);
}
CallSiteIndex emitStoreCodeOrigin(CodeOrigin codeOrigin)
{
CallSiteIndex callSite = addCallSite(codeOrigin);
emitStoreCallSiteIndex(callSite);
return callSite;
}
void emitStoreCallSiteIndex(CallSiteIndex callSite)
{
store32(TrustedImm32(callSite.bits()), tagFor(static_cast<VirtualRegister>(CallFrameSlot::argumentCount)));
}
// Add a call out from JIT code, without an exception check.
Call appendCall(const FunctionPtr<CFunctionPtrTag> function)
{
Call functionCall = call(OperationPtrTag);
m_calls.append(CallLinkRecord(functionCall, function.retagged<OperationPtrTag>()));
return functionCall;
}
void exceptionCheck();
void exceptionCheckWithCallFrameRollback()
{
m_exceptionChecksWithCallFrameRollback.append(emitExceptionCheck(vm()));
}
// Add a call out from JIT code, with a fast exception check that tests if the return value is zero.
void fastExceptionCheck()
{
callExceptionFuzz(vm());
m_exceptionChecks.append(branchTestPtr(Zero, GPRInfo::returnValueGPR));
}
OSRExitCompilationInfo& appendExitInfo(MacroAssembler::JumpList jumpsToFail = MacroAssembler::JumpList())
{
OSRExitCompilationInfo info;
info.m_failureJumps = jumpsToFail;
m_exitCompilationInfo.append(info);
return m_exitCompilationInfo.last();
}
#if USE(JSVALUE32_64)
void* addressOfDoubleConstant(Node*);
#endif
void addGetById(const JITGetByIdGenerator& gen, SlowPathGenerator* slowPath)
{
m_getByIds.append(InlineCacheWrapper<JITGetByIdGenerator>(gen, slowPath));
}
void addGetByIdWithThis(const JITGetByIdWithThisGenerator& gen, SlowPathGenerator* slowPath)
{
m_getByIdsWithThis.append(InlineCacheWrapper<JITGetByIdWithThisGenerator>(gen, slowPath));
}
void addPutById(const JITPutByIdGenerator& gen, SlowPathGenerator* slowPath)
{
m_putByIds.append(InlineCacheWrapper<JITPutByIdGenerator>(gen, slowPath));
}
void addInstanceOf(const JITInstanceOfGenerator& gen, SlowPathGenerator* slowPath)
{
m_instanceOfs.append(InlineCacheWrapper<JITInstanceOfGenerator>(gen, slowPath));
}
void addInById(const JITInByIdGenerator& gen, SlowPathGenerator* slowPath)
{
m_inByIds.append(InlineCacheWrapper<JITInByIdGenerator>(gen, slowPath));
}
void addJSCall(Call fastCall, Call slowCall, DataLabelPtr targetToCheck, CallLinkInfo* info)
{
m_jsCalls.append(JSCallRecord(fastCall, slowCall, targetToCheck, info));
}
void addJSDirectCall(Call call, Label slowPath, CallLinkInfo* info)
{
m_jsDirectCalls.append(JSDirectCallRecord(call, slowPath, info));
}
void addJSDirectTailCall(PatchableJump patchableJump, Call call, Label slowPath, CallLinkInfo* info)
{
m_jsDirectTailCalls.append(JSDirectTailCallRecord(patchableJump, call, slowPath, info));
}
void addWeakReference(JSCell* target)
{
m_graph.m_plan.weakReferences().addLazily(target);
}
void addWeakReferences(const StructureSet& structureSet)
{
for (unsigned i = structureSet.size(); i--;)
addWeakReference(structureSet[i]);
}
template<typename T>
Jump branchWeakPtr(RelationalCondition cond, T left, JSCell* weakPtr)
{
Jump result = branchPtr(cond, left, TrustedImmPtr(weakPtr));
addWeakReference(weakPtr);
return result;
}
template<typename T>
Jump branchWeakStructure(RelationalCondition cond, T left, RegisteredStructure weakStructure)
{
Structure* structure = weakStructure.get();
#if USE(JSVALUE64)
Jump result = branch32(cond, left, TrustedImm32(structure->id()));
return result;
#else
return branchPtr(cond, left, TrustedImmPtr(structure));
#endif
}
void noticeOSREntry(BasicBlock&, JITCompiler::Label blockHead, LinkBuffer&);
void noticeCatchEntrypoint(BasicBlock&, JITCompiler::Label blockHead, LinkBuffer&, Vector<FlushFormat>&& argumentFormats);
RefPtr<JITCode> jitCode() { return m_jitCode; }
Vector<Label>& blockHeads() { return m_blockHeads; }
CallSiteIndex recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded(const CodeOrigin&, unsigned eventStreamIndex);
PCToCodeOriginMapBuilder& pcToCodeOriginMapBuilder() { return m_pcToCodeOriginMapBuilder; }
VM& vm() { return m_graph.m_vm; }
private:
friend class OSRExitJumpPlaceholder;
// Internal implementation to compile.
void compileEntry();
void compileSetupRegistersForEntry();
void compileEntryExecutionFlag();
void compileBody();
void link(LinkBuffer&);
void exitSpeculativeWithOSR(const OSRExit&, SpeculationRecovery*);
void compileExceptionHandlers();
void linkOSRExits();
void disassemble(LinkBuffer&);
void appendExceptionHandlingOSRExit(ExitKind, unsigned eventStreamIndex, CodeOrigin, HandlerInfo* exceptionHandler, CallSiteIndex, MacroAssembler::JumpList jumpsToFail = MacroAssembler::JumpList());
void makeCatchOSREntryBuffer();
// The dataflow graph currently being generated.
Graph& m_graph;
std::unique_ptr<Disassembler> m_disassembler;
RefPtr<JITCode> m_jitCode;
// Vector of calls out from JIT code, including exception handler information.
// Count of the number of CallRecords with exception handlers.
Vector<CallLinkRecord> m_calls;
JumpList m_exceptionChecks;
JumpList m_exceptionChecksWithCallFrameRollback;
Vector<Label> m_blockHeads;
struct JSCallRecord {
JSCallRecord(Call fastCall, Call slowCall, DataLabelPtr targetToCheck, CallLinkInfo* info)
: fastCall(fastCall)
, slowCall(slowCall)
, targetToCheck(targetToCheck)
, info(info)
{
ASSERT(fastCall.isFlagSet(Call::Near));
ASSERT(slowCall.isFlagSet(Call::Near));
}
Call fastCall;
Call slowCall;
DataLabelPtr targetToCheck;
CallLinkInfo* info;
};
struct JSDirectCallRecord {
JSDirectCallRecord(Call call, Label slowPath, CallLinkInfo* info)
: call(call)
, slowPath(slowPath)
, info(info)
{
ASSERT(call.isFlagSet(Call::Near));
}
Call call;
Label slowPath;
CallLinkInfo* info;
};
struct JSDirectTailCallRecord {
JSDirectTailCallRecord(PatchableJump patchableJump, Call call, Label slowPath, CallLinkInfo* info)
: patchableJump(patchableJump)
, call(call)
, slowPath(slowPath)
, info(info)
{
ASSERT(call.isFlagSet(Call::Near) && call.isFlagSet(Call::Tail));
}
PatchableJump patchableJump;
Call call;
Label slowPath;
CallLinkInfo* info;
};
Vector<InlineCacheWrapper<JITGetByIdGenerator>, 4> m_getByIds;
Vector<InlineCacheWrapper<JITGetByIdWithThisGenerator>, 4> m_getByIdsWithThis;
Vector<InlineCacheWrapper<JITPutByIdGenerator>, 4> m_putByIds;
Vector<InlineCacheWrapper<JITInByIdGenerator>, 4> m_inByIds;
Vector<InlineCacheWrapper<JITInstanceOfGenerator>, 4> m_instanceOfs;
Vector<JSCallRecord, 4> m_jsCalls;
Vector<JSDirectCallRecord, 4> m_jsDirectCalls;
Vector<JSDirectTailCallRecord, 4> m_jsDirectTailCalls;
SegmentedVector<OSRExitCompilationInfo, 4> m_exitCompilationInfo;
Vector<Vector<Label>> m_exitSiteLabels;
struct ExceptionHandlingOSRExitInfo {
OSRExitCompilationInfo& exitInfo;
HandlerInfo baselineExceptionHandler;
CallSiteIndex callSiteIndex;
};
Vector<ExceptionHandlingOSRExitInfo> m_exceptionHandlerOSRExitCallSites;
std::unique_ptr<SpeculativeJIT> m_speculative;
PCToCodeOriginMapBuilder m_pcToCodeOriginMapBuilder;
};
} } // namespace JSC::DFG
#endif