ChakraCore/lib/Backend/Inline.h

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#pragma once

class Inline
{
public:
    Inline(Func *topFunc, InliningHeuristics &heuristics, uint lCount = 0, uint  currentInlineeFrameSlot = 0, bool isApplyTargetInliningInProgress = false) :
        topFunc(topFunc), inlineesProcessed(0), currentInlineeFrameSlot(currentInlineeFrameSlot), isInLoop(lCount), inliningHeuristics(heuristics),
        isApplyTargetInliningInProgress(isApplyTargetInliningInProgress), isInInlinedApplyCall(false){}
    void Optimize();
    static IR::Instr* GetDefInstr(IR::Opnd* linkOpnd);
private:
    Func *topFunc;
    uint inlineesProcessed;
    uint currentInlineeFrameSlot;

    // Indicates if you are in loop, counter can increment beyond 1 for nested inlined functions
    // But for a single function won't increment beyond 1 for nested loops.
    uint isInLoop;

    // Following flag indicates that inlinee is a target function of apply.
    // For example: We are trying to inline init in this.init.apply(this, arguments);
    // We don't support recursively inlining another target function inside init body (such as this.bar.apply(this, arguments))
    // Reason being we will have to patch up the top function actuals recursively in two nested functions and that is not supported.
    bool isApplyTargetInliningInProgress;
    bool isInInlinedApplyCall;

    InliningHeuristics &inliningHeuristics;

    IR::PragmaInstr * lastStatementBoundary;

    void Optimize(Func *func, __in_ecount_opt(actuals) IR::Instr *argOuts[] = NULL, Js::ArgSlot actuals = (Js::ArgSlot) - 1, uint recursiveInlineDepth = 0);
    bool TryOptimizeCallInstrWithFixedMethod(IR::Instr *callInstr, Js::FunctionInfo* functionInfo, bool isPolymorphic, bool isBuiltIn, bool isCtor, bool isInlined, bool& safeThis,
                                            bool dontOptimizeJustCheck = false, uint i = 0 /*i-th inlinee at a polymorphic call site*/);
    Js::Var TryOptimizeInstrWithFixedDataProperty(IR::Instr *&instr);
    IR::Instr * InlineScriptFunction(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData *const inlineeData, const StackSym *symThis, const Js::ProfileId profileId, bool* pIsInlined, uint recursiveInlineDepth);
#ifdef ENABLE_DOM_FAST_PATH
    IR::Instr * InlineDOMGetterSetterFunction(IR::Instr *ldFldInstr, const Js::FunctionCodeGenJitTimeData *const inlineeData, const Js::FunctionCodeGenJitTimeData *const inlinerData);
#endif
    IR::Instr * InlineGetterSetterFunction(IR::Instr *accessorInstr, const Js::FunctionCodeGenJitTimeData *const inlineeData, const StackSym *symCallerThis, const uint inlineCacheIndex, bool isGetter, uint recursiveInlineDepth);
    IR::Instr * InlineFunctionCommon(IR::Instr *callInstr, StackSym* originalCallTargetStackSym, Js::FunctionBody *funcBody, Func *inlinee, IR::Instr *instrNext,
                                IR::RegOpnd * returnValueOpnd, IR::Instr *inlineBailoutChecksBeforeInstr, const StackSym *symCallerThis, uint recursiveInlineDepth, bool safeThis = false, bool isApplyTarget = false);
    IR::Instr * SimulateCallForGetterSetter(IR::Instr *accessorInstr, IR::Instr* insertInstr, IR::PropertySymOpnd* methodOpnd, bool isGetter);

    IR::Instr * InlineApply(IR::Instr *callInstr, Js::FunctionInfo *funcInfo, const Js::FunctionCodeGenJitTimeData* inlinerData, const StackSym *symThis, bool* pIsInlined, uint callSiteId, uint recursiveInlineDepth);
    IR::Instr * InlineApplyWithArray(IR::Instr *callInstr, Js::FunctionInfo * funcInfo, Js::BuiltinFunction builtInId);
    IR::Instr * InlineApplyWithArgumentsObject(IR::Instr * callInstr, IR::Instr * argsObjectArgInstr, Js::FunctionInfo * funcInfo);
    bool        InlineApplyTarget(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData* inlinerData, const Js::FunctionCodeGenJitTimeData** pInlineeData, Js::FunctionInfo *applyFuncInfo,
                                    const StackSym *symThis, IR::Instr ** returnInstr, uint recursiveInlineDepth);

    IR::Instr * InlineCall(IR::Instr *callInstr, Js::FunctionInfo *funcInfo, const Js::FunctionCodeGenJitTimeData* inlinerData, const StackSym *symThis, bool* pIsInlined, uint callSiteId, uint recursiveInlineDepth);
    bool        InlineCallTarget(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData* inlinerData, const Js::FunctionCodeGenJitTimeData** pInlineeData, Js::FunctionInfo *callFuncInfo,
                                    const StackSym *symThis, IR::Instr ** returnInstr, uint recursiveInlineDepth);

    bool        InlConstFoldArg(IR::Instr *instr, __in_ecount_opt(callerArgOutCount) IR::Instr *callerArgOuts[], Js::ArgSlot callerArgOutCount);
    bool        InlConstFold(IR::Instr *instr, IntConstType *pValue, __in_ecount_opt(callerArgOutCount) IR::Instr *callerArgOuts[], Js::ArgSlot callerArgOutCount);

    IR::Instr * InlineCallApplyTarget_Shared(IR::Instr *callInstr, StackSym* originalCallTargetStackSym, Js::FunctionInfo *funcInfo, const Js::FunctionCodeGenJitTimeData *const inlineeData,
                    uint inlineCacheIndex, bool safeThis, bool isApplyTarget, bool isCallTarget, uint recursiveInlineDepth);
    bool        SkipCallApplyTargetInlining_Shared(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData* inlinerData, const Js::FunctionCodeGenJitTimeData* inlineeData, bool isApplyTarget, bool isCallTarget);
    bool        TryGetFixedMethodsForBuiltInAndTarget(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData* inlinerData, const Js::FunctionCodeGenJitTimeData* inlineeData, Js::FunctionInfo *builtInFuncInfo,
                                IR::Instr* builtInLdInstr, IR::Instr* targetLdInstr, bool& safeThis, bool isApplyTarget);

    IR::Instr * InlineBuiltInFunction(IR::Instr *callInstr, Js::FunctionInfo *funcInfo, Js::OpCode inlineCallOpCode, const Js::FunctionCodeGenJitTimeData* inlinerData, const StackSym *symCallerThis, bool* pIsInlined, uint profileId, uint recursiveInlineDepth);
    IR::Instr * InlineFunc(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData *const inlineeData, const uint profileId);
    bool        SplitConstructorCall(IR::Instr *const newObjInstr, const bool isInlined, const bool doneFixedMethodFld, IR::Instr** createObjInstrOut = nullptr, IR::Instr** callCtorInstrOut = nullptr) const;
    bool        SplitConstructorCallCommon(IR::Instr *const newObjInstr, IR::Opnd *const lastArgOpnd, const Js::OpCode newObjOpCode,
        const bool isInlined, const bool doneFixedMethodFld, IR::Instr** createObjInstrOut, IR::Instr** callCtorInstrOut) const;
    IR::Instr * InlinePolymorphicFunction(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData* inlinerData, const StackSym *symCallerThis, const Js::ProfileId profileId, bool* pIsInlined, uint recursiveInlineDepth, bool triedUsingFixedMethods = false);
    IR::Instr * InlinePolymorphicFunctionUsingFixedMethods(IR::Instr *callInstr, const Js::FunctionCodeGenJitTimeData* inlinerData, const StackSym *symCallerThis, const Js::ProfileId profileId, IR::PropertySymOpnd* methodValueOpnd, bool* pIsInlined, uint recursiveInlineDepth);

    IR::Instr * InlineSpread(IR::Instr *spreadCall);

    void        SetupInlineInstrForCallDirect(Js::BuiltinFunction builtInId, IR::Instr* inlineInstr, IR::Instr* argoutInstr);
    void        WrapArgsOutWithCoerse(Js::BuiltinFunction builtInId, IR::Instr* inlineInstr);
    void        SetupInlineeFrame(Func *inlinee, IR::Instr *inlineeStart, Js::ArgSlot actualCount, IR::Opnd *functionObject);
    void        FixupExtraActualParams(IR::Instr * instr, IR::Instr *argOuts[], IR::Instr *argOutsExtra[], uint index, uint actualCount, Js::ProfileId callSiteId);
    void        RemoveExtraFixupArgouts(IR::Instr* instr, uint argoutRemoveCount, Js::ProfileId callSiteId);
    IR::Instr*  PrepareInsertionPoint(IR::Instr *callInstr, Js::FunctionInfo *funcInfo, IR::Instr *insertBeforeInstr, IR::BailOutKind bailOutKind = IR::BailOutOnInlineFunction);
    Js::ArgSlot MapActuals(IR::Instr *callInstr, __out_ecount(maxParamCount) IR::Instr *argOuts[], Js::ArgSlot formalCount, Func *inlinee, Js::ProfileId callSiteId, bool *stackArgsArgOutExpanded, IR::Instr *argOutsExtra[] = nullptr, Js::ArgSlot maxParamCount = Js::InlineeCallInfo::MaxInlineeArgoutCount);
    uint32      CountActuals(IR::Instr *callIntr);
    void        MapFormals(Func *inlinee, __in_ecount(formalCount) IR::Instr *argOuts[], uint formalCount, uint actualCount, IR::RegOpnd *retOpnd, IR::Opnd * funcObjOpnd, const StackSym *symCallerThis, bool stackArgsArgOutExpanded, bool fixedFunctionSafeThis = false, IR::Instr *argOutsExtra[] = nullptr);
    IR::Instr * DoCheckThisOpt(IR::Instr * instr);
    IR::Instr * RemoveLdThis(IR::Instr *instr);
    bool        GetInlineeHasArgumentObject(Func * inlinee);
    bool        HasArgumentsAccess(IR::Instr * instr, SymID argumentsSymId);
    bool        HasArgumentsAccess(IR::Opnd * opnd, SymID argumentsSymId);
    bool        IsArgumentsOpnd(IR::Opnd* opnd,SymID argumentsSymId);
    void        Cleanup(IR::Instr *callInstr);
    IR::PropertySymOpnd* GetMethodLdOpndForCallInstr(IR::Instr* callInstr);
    IR::Instr* InsertInlineeBuiltInStartEndTags(IR::Instr* callInstr, uint actualcount, IR::Instr** builtinStartInstr = nullptr);
    bool IsInliningOutSideLoops(){return  topFunc->GetJnFunction()->GetHasLoops() && isInLoop == 0; }

    struct InlineeData
    {
        Js::FunctionCodeGenJitTimeData const* inlineeJitTimeData;
        Js::FunctionCodeGenRuntimeData const* inlineeRuntimeData;
        Js::FunctionBody* functionBody;
    };

    uint FillInlineesDataArray(
        const Js::FunctionCodeGenJitTimeData* inlineeJitTimeData,
        const Js::FunctionCodeGenRuntimeData* inlineeRuntimeData,
        _Out_writes_to_(inlineesDataArrayLength, (return >= inlineesDataArrayLength? inlineesDataArrayLength : return))  InlineeData *inlineesDataArray,
        uint inlineesDataArrayLength
        );

    void FillInlineesDataArrayUsingFixedMethods(
        const Js::FunctionCodeGenJitTimeData* inlineeJitTimeData,
        const Js::FunctionCodeGenRuntimeData* inlineeRuntimeData,
        __inout_ecount(inlineesDataArrayLength) InlineeData *inlineesDataArray,
        uint inlineesDataArrayLength,
        __inout_ecount(cachedFixedInlineeCount) Js::FixedFieldInfo* fixedFunctionInfoArray,
        uint16 cachedFixedInlineeCount
        );

    // Builds IR for inlinee
    Func * BuildInlinee(Js::FunctionBody* funcBody, const InlineeData& inlineesData, Js::RegSlot returnRegSlot, IR::Instr *callInstr, uint recursiveInlineDepth);
    void BuildIRForInlinee(Func *inlinee, Js::FunctionBody *funcBody, IR::Instr *callInstr, bool isApplyTarget = false, uint recursiveInlineDepth = 0);
    void InsertStatementBoundary(IR::Instr * instrNext);
    void InsertOneInlinee(IR::Instr* callInstr, IR::RegOpnd* returnValueOpnd,
        IR::Opnd* methodOpnd, const InlineeData& inlineeData, IR::LabelInstr* doneLabel, const StackSym* symCallerThis, bool fixedFunctionSafeThis, uint recursiveInlineDepth);
    void CompletePolymorphicInlining(IR::Instr* callInstr, IR::RegOpnd* returnValueOpnd, IR::LabelInstr* doneLabel, IR::Instr* dispatchStartLabel, IR::Instr* ldMethodFldInstr, IR::BailOutKind bailoutKind);
    uint HandleDifferentTypesSameFunction(__inout_ecount(cachedFixedInlineeCount) Js::FixedFieldInfo* fixedFunctionInfoArray, uint16 cachedFixedInlineeCount);
    void SetInlineeFrameStartSym(Func *inlinee, uint actualCount);
    void CloneCallSequence(IR::Instr* callInstr, IR::Instr* clonedCallInstr);

    void InsertObjectCheck(IR::Instr *callInstr, IR::Instr* insertBeforeInstr, IR::Instr*bailOutInstr);
    void InsertFunctionTypeIdCheck(IR::Instr *callInstr, IR::Instr* insertBeforeInstr, IR::Instr*bailOutInstr);
    void InsertJsFunctionCheck(IR::Instr *callInstr, IR::Instr *insertBeforeInstr, IR::BailOutKind bailOutKind);
    void InsertFunctionBodyCheck(IR::Instr *callInstr, IR::Instr *insertBeforeInstr, IR::Instr* bailoutInstr, Js::FunctionInfo *funcInfo);
    void InsertFunctionObjectCheck(IR::Instr *callInstr, IR::Instr *insertBeforeInstr, IR::Instr* bailoutInstr, Js::FunctionInfo *funcInfo);

    void TryResetObjTypeSpecFldInfoOn(IR::PropertySymOpnd* propertySymOpnd);
    void TryDisableRuntimePolymorphicCacheOn(IR::PropertySymOpnd* propertySymOpnd);

    IR::Opnd * ConvertToInlineBuiltInArgOut(IR::Instr * argInstr);
    void GenerateArgOutUse(IR::Instr* argInstr);

    bool    GetIsInInlinedApplyCall() const { return this->isInInlinedApplyCall; }
    void    SetIsInInlinedApplyCall(bool inInlinedApplyCall) { this->isInInlinedApplyCall = inInlinedApplyCall; }
};