X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FMachineFrameInfo.h;h=0699863311f97ac1534c2f7fe6f79b70f8e73b68;hb=eb3d76da81e2148ed7c577594c873ba147f4f435;hp=a4c9620a04c58a4c488e64e12e1ca5112a7fbc24;hpb=e47b1446d8f072107c45168aa77fd9c6e0327c32;p=oota-llvm.git diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h index a4c9620a04c..0699863311f 100644 --- a/include/llvm/CodeGen/MachineFrameInfo.h +++ b/include/llvm/CodeGen/MachineFrameInfo.h @@ -2,43 +2,48 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by the LLVM research group and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// The file defines the MachineFrameInfo class. // //===----------------------------------------------------------------------===// - #ifndef LLVM_CODEGEN_MACHINEFRAMEINFO_H #define LLVM_CODEGEN_MACHINEFRAMEINFO_H +#include "llvm/ADT/SmallVector.h" +#include "llvm/Support/DataTypes.h" +#include #include namespace llvm { -class TargetData; +class raw_ostream; +class DataLayout; class TargetRegisterClass; class Type; -class MachineModuleInfo; class MachineFunction; +class MachineBasicBlock; +class TargetFrameLowering; +class TargetMachine; +class BitVector; +class Value; +class AllocaInst; /// The CalleeSavedInfo class tracks the information need to locate where a -/// callee saved register in the current frame. +/// callee saved register is in the current frame. class CalleeSavedInfo { - -private: unsigned Reg; - const TargetRegisterClass *RegClass; int FrameIdx; - + public: - CalleeSavedInfo(unsigned R, const TargetRegisterClass *RC, int FI = 0) - : Reg(R) - , RegClass(RC) - , FrameIdx(FI) - {} - + explicit CalleeSavedInfo(unsigned R, int FI = 0) + : Reg(R), FrameIdx(FI) {} + // Accessors. unsigned getReg() const { return Reg; } - const TargetRegisterClass *getRegClass() const { return RegClass; } int getFrameIdx() const { return FrameIdx; } void setFrameIdx(int FI) { FrameIdx = FI; } }; @@ -51,7 +56,7 @@ public: /// /// To support this, the class assigns unique integer identifiers to stack /// objects requested clients. These identifiers are negative integers for -/// fixed stack objects (such as arguments passed on the stack) or positive +/// fixed stack objects (such as arguments passed on the stack) or nonnegative /// for objects that may be reordered. Instructions which refer to stack /// objects use a special MO_FrameIndex operand to represent these frame /// indexes. @@ -76,20 +81,42 @@ class MachineFrameInfo { // StackObject - Represent a single object allocated on the stack. struct StackObject { - // The size of this object on the stack. 0 means a variable sized object + // SPOffset - The offset of this object from the stack pointer on entry to + // the function. This field has no meaning for a variable sized element. + int64_t SPOffset; + + // The size of this object on the stack. 0 means a variable sized object, + // ~0ULL means a dead object. uint64_t Size; // Alignment - The required alignment of this stack slot. unsigned Alignment; - // SPOffset - The offset of this object from the stack pointer on entry to - // the function. This field has no meaning for a variable sized element. - int64_t SPOffset; + // isImmutable - If true, the value of the stack object is set before + // entering the function and is not modified inside the function. By + // default, fixed objects are immutable unless marked otherwise. + bool isImmutable; + + // isSpillSlot - If true the stack object is used as spill slot. It + // cannot alias any other memory objects. + bool isSpillSlot; + + /// Alloca - If this stack object is originated from an Alloca instruction + /// this value saves the original IR allocation. Can be NULL. + const AllocaInst *Alloca; + + // PreAllocated - If true, the object was mapped into the local frame + // block and doesn't need additional handling for allocation beyond that. + bool PreAllocated; - StackObject(uint64_t Sz, unsigned Al, int64_t SP) - : Size(Sz), Alignment(Al), SPOffset(SP) {} + StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM, + bool isSS, const AllocaInst *Val) + : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM), + isSpillSlot(isSS), Alloca(Val), PreAllocated(false) {} }; + const TargetMachine &TM; + /// Objects - The list of stack objects allocated... /// std::vector Objects; @@ -105,34 +132,64 @@ class MachineFrameInfo { /// bool HasVarSizedObjects; + /// FrameAddressTaken - This boolean keeps track of whether there is a call + /// to builtin \@llvm.frameaddress. + bool FrameAddressTaken; + + /// ReturnAddressTaken - This boolean keeps track of whether there is a call + /// to builtin \@llvm.returnaddress. + bool ReturnAddressTaken; + + /// HasStackMap - This boolean keeps track of whether there is a call + /// to builtin \@llvm.experimental.stackmap. + bool HasStackMap; + + /// HasPatchPoint - This boolean keeps track of whether there is a call + /// to builtin \@llvm.experimental.patchpoint. + bool HasPatchPoint; + /// StackSize - The prolog/epilog code inserter calculates the final stack /// offsets for all of the fixed size objects, updating the Objects list /// above. It then updates StackSize to contain the number of bytes that need /// to be allocated on entry to the function. /// uint64_t StackSize; - + /// OffsetAdjustment - The amount that a frame offset needs to be adjusted to - /// have the actual offset from the stack/frame pointer. The calculation is - /// MFI->getObjectOffset(Index) + StackSize - TFI.getOffsetOfLocalArea() + - /// OffsetAdjustment. If OffsetAdjustment is zero (default) then offsets are - /// away from TOS. If OffsetAdjustment == StackSize then offsets are toward - /// TOS. + /// have the actual offset from the stack/frame pointer. The exact usage of + /// this is target-dependent, but it is typically used to adjust between + /// SP-relative and FP-relative offsets. E.G., if objects are accessed via + /// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set + /// to the distance between the initial SP and the value in FP. For many + /// targets, this value is only used when generating debug info (via + /// TargetRegisterInfo::getFrameIndexOffset); when generating code, the + /// corresponding adjustments are performed directly. int OffsetAdjustment; - - /// MaxAlignment - The prolog/epilog code inserter may process objects + + /// MaxAlignment - The prolog/epilog code inserter may process objects /// that require greater alignment than the default alignment the target - /// provides. To handle this, MaxAlignment is set to the maximum alignment + /// provides. To handle this, MaxAlignment is set to the maximum alignment /// needed by the objects on the current frame. If this is greater than the /// native alignment maintained by the compiler, dynamic alignment code will /// be needed. /// unsigned MaxAlignment; - /// HasCalls - Set to true if this function has any function calls. This is - /// only valid during and after prolog/epilog code insertion. + /// AdjustsStack - Set to true if this function adjusts the stack -- e.g., + /// when calling another function. This is only valid during and after + /// prolog/epilog code insertion. + bool AdjustsStack; + + /// HasCalls - Set to true if this function has any function calls. bool HasCalls; + /// StackProtectorIdx - The frame index for the stack protector. + int StackProtectorIdx; + + /// FunctionContextIdx - The frame index for the function context. Used for + /// SjLj exceptions. + int FunctionContextIdx; + /// MaxCallFrameSize - This contains the size of the largest call frame if the /// target uses frame setup/destroy pseudo instructions (as defined in the /// TargetFrameInfo class). This information is important for frame pointer @@ -140,27 +197,58 @@ class MachineFrameInfo { /// insertion. /// unsigned MaxCallFrameSize; - + /// CSInfo - The prolog/epilog code inserter fills in this vector with each /// callee saved register saved in the frame. Beyond its use by the prolog/ /// epilog code inserter, this data used for debug info and exception /// handling. std::vector CSInfo; - - /// MMI - This field is set (via setMachineModuleInfo) by a module info - /// consumer (ex. DwarfWriter) to indicate that frame layout information - /// should be acquired. Typically, it's the responsibility of the target's - /// MRegisterInfo prologue/epilogue emitting code to inform MachineModuleInfo - /// of frame layouts. - MachineModuleInfo *MMI; - + + /// CSIValid - Has CSInfo been set yet? + bool CSIValid; + + /// LocalFrameObjects - References to frame indices which are mapped + /// into the local frame allocation block. + SmallVector, 32> LocalFrameObjects; + + /// LocalFrameSize - Size of the pre-allocated local frame block. + int64_t LocalFrameSize; + + /// Required alignment of the local object blob, which is the strictest + /// alignment of any object in it. + unsigned LocalFrameMaxAlign; + + /// Whether the local object blob needs to be allocated together. If not, + /// PEI should ignore the isPreAllocated flags on the stack objects and + /// just allocate them normally. + bool UseLocalStackAllocationBlock; + + /// Whether the "realign-stack" option is on. + bool RealignOption; + + /// True if the function includes inline assembly that adjusts the stack + /// pointer. + bool HasInlineAsmWithSPAdjust; + + const TargetFrameLowering *getFrameLowering() const; public: - MachineFrameInfo() { - NumFixedObjects = StackSize = OffsetAdjustment = MaxAlignment = 0; + explicit MachineFrameInfo(const TargetMachine &TM, bool RealignOpt) + : TM(TM), RealignOption(RealignOpt) { + StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0; HasVarSizedObjects = false; + FrameAddressTaken = false; + ReturnAddressTaken = false; + HasStackMap = false; + HasPatchPoint = false; + AdjustsStack = false; HasCalls = false; + StackProtectorIdx = -1; + FunctionContextIdx = -1; MaxCallFrameSize = 0; - MMI = 0; + CSIValid = false; + LocalFrameSize = 0; + LocalFrameMaxAlign = 0; + UseLocalStackAllocationBlock = false; } /// hasStackObjects - Return true if there are any stack objects in this @@ -174,32 +262,153 @@ public: /// bool hasVarSizedObjects() const { return HasVarSizedObjects; } - /// getObjectIndexBegin - Return the minimum frame object index... + /// getStackProtectorIndex/setStackProtectorIndex - Return the index for the + /// stack protector object. + /// + int getStackProtectorIndex() const { return StackProtectorIdx; } + void setStackProtectorIndex(int I) { StackProtectorIdx = I; } + + /// getFunctionContextIndex/setFunctionContextIndex - Return the index for the + /// function context object. This object is used for SjLj exceptions. + int getFunctionContextIndex() const { return FunctionContextIdx; } + void setFunctionContextIndex(int I) { FunctionContextIdx = I; } + + /// isFrameAddressTaken - This method may be called any time after instruction + /// selection is complete to determine if there is a call to + /// \@llvm.frameaddress in this function. + bool isFrameAddressTaken() const { return FrameAddressTaken; } + void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; } + + /// isReturnAddressTaken - This method may be called any time after + /// instruction selection is complete to determine if there is a call to + /// \@llvm.returnaddress in this function. + bool isReturnAddressTaken() const { return ReturnAddressTaken; } + void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; } + + /// hasStackMap - This method may be called any time after instruction + /// selection is complete to determine if there is a call to builtin + /// \@llvm.experimental.stackmap. + bool hasStackMap() const { return HasStackMap; } + void setHasStackMap(bool s = true) { HasStackMap = s; } + + /// hasPatchPoint - This method may be called any time after instruction + /// selection is complete to determine if there is a call to builtin + /// \@llvm.experimental.patchpoint. + bool hasPatchPoint() const { return HasPatchPoint; } + void setHasPatchPoint(bool s = true) { HasPatchPoint = s; } + + /// getObjectIndexBegin - Return the minimum frame object index. /// int getObjectIndexBegin() const { return -NumFixedObjects; } - /// getObjectIndexEnd - Return one past the maximum frame object index... + /// getObjectIndexEnd - Return one past the maximum frame object index. + /// + int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; } + + /// getNumFixedObjects - Return the number of fixed objects. + unsigned getNumFixedObjects() const { return NumFixedObjects; } + + /// getNumObjects - Return the number of objects. /// - int getObjectIndexEnd() const { return Objects.size()-NumFixedObjects; } + unsigned getNumObjects() const { return Objects.size(); } + + /// mapLocalFrameObject - Map a frame index into the local object block + void mapLocalFrameObject(int ObjectIndex, int64_t Offset) { + LocalFrameObjects.push_back(std::pair(ObjectIndex, Offset)); + Objects[ObjectIndex + NumFixedObjects].PreAllocated = true; + } + + /// getLocalFrameObjectMap - Get the local offset mapping for a for an object + std::pair getLocalFrameObjectMap(int i) { + assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() && + "Invalid local object reference!"); + return LocalFrameObjects[i]; + } + + /// getLocalFrameObjectCount - Return the number of objects allocated into + /// the local object block. + int64_t getLocalFrameObjectCount() { return LocalFrameObjects.size(); } + + /// setLocalFrameSize - Set the size of the local object blob. + void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; } + + /// getLocalFrameSize - Get the size of the local object blob. + int64_t getLocalFrameSize() const { return LocalFrameSize; } + + /// setLocalFrameMaxAlign - Required alignment of the local object blob, + /// which is the strictest alignment of any object in it. + void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; } + + /// getLocalFrameMaxAlign - Return the required alignment of the local + /// object blob. + unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; } + + /// getUseLocalStackAllocationBlock - Get whether the local allocation blob + /// should be allocated together or let PEI allocate the locals in it + /// directly. + bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;} + + /// setUseLocalStackAllocationBlock - Set whether the local allocation blob + /// should be allocated together or let PEI allocate the locals in it + /// directly. + void setUseLocalStackAllocationBlock(bool v) { + UseLocalStackAllocationBlock = v; + } + + /// isObjectPreAllocated - Return true if the object was pre-allocated into + /// the local block. + bool isObjectPreAllocated(int ObjectIdx) const { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + return Objects[ObjectIdx+NumFixedObjects].PreAllocated; + } - /// getObjectSize - Return the size of the specified object + /// getObjectSize - Return the size of the specified object. /// int64_t getObjectSize(int ObjectIdx) const { - assert(ObjectIdx+NumFixedObjects < Objects.size() && "Invalid Object Idx!"); + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); return Objects[ObjectIdx+NumFixedObjects].Size; } - /// getObjectAlignment - Return the alignment of the specified stack object... - int getObjectAlignment(int ObjectIdx) const { - assert(ObjectIdx+NumFixedObjects < Objects.size() && "Invalid Object Idx!"); + /// setObjectSize - Change the size of the specified stack object. + void setObjectSize(int ObjectIdx, int64_t Size) { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + Objects[ObjectIdx+NumFixedObjects].Size = Size; + } + + /// getObjectAlignment - Return the alignment of the specified stack object. + unsigned getObjectAlignment(int ObjectIdx) const { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); return Objects[ObjectIdx+NumFixedObjects].Alignment; } + /// setObjectAlignment - Change the alignment of the specified stack object. + void setObjectAlignment(int ObjectIdx, unsigned Align) { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + Objects[ObjectIdx+NumFixedObjects].Alignment = Align; + ensureMaxAlignment(Align); + } + + /// getObjectAllocation - Return the underlying Alloca of the specified + /// stack object if it exists. Returns 0 if none exists. + const AllocaInst* getObjectAllocation(int ObjectIdx) const { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + return Objects[ObjectIdx+NumFixedObjects].Alloca; + } + /// getObjectOffset - Return the assigned stack offset of the specified object /// from the incoming stack pointer. /// int64_t getObjectOffset(int ObjectIdx) const { - assert(ObjectIdx+NumFixedObjects < Objects.size() && "Invalid Object Idx!"); + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + assert(!isDeadObjectIndex(ObjectIdx) && + "Getting frame offset for a dead object?"); return Objects[ObjectIdx+NumFixedObjects].SPOffset; } @@ -207,7 +416,10 @@ public: /// offset is relative to the stack pointer on entry to the function. /// void setObjectOffset(int ObjectIdx, int64_t SPOffset) { - assert(ObjectIdx+NumFixedObjects < Objects.size() && "Invalid Object Idx!"); + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + assert(!isDeadObjectIndex(ObjectIdx) && + "Setting frame offset for a dead object?"); Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset; } @@ -220,31 +432,42 @@ public: /// setStackSize - Set the size of the stack... /// void setStackSize(uint64_t Size) { StackSize = Size; } - + + /// Estimate and return the size of the stack frame. + unsigned estimateStackSize(const MachineFunction &MF) const; + /// getOffsetAdjustment - Return the correction for frame offsets. /// int getOffsetAdjustment() const { return OffsetAdjustment; } - + /// setOffsetAdjustment - Set the correction for frame offsets. /// void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; } - /// getMaxAlignment - Return the alignment in bytes that this function must be - /// aligned to, which is greater than the default stack alignment provided by + /// getMaxAlignment - Return the alignment in bytes that this function must be + /// aligned to, which is greater than the default stack alignment provided by /// the target. /// unsigned getMaxAlignment() const { return MaxAlignment; } - - /// setMaxAlignment - Set the preferred alignment. - /// - void setMaxAlignment(unsigned Align) { MaxAlignment = Align; } - - /// hasCalls - Return true if the current function has no function calls. - /// This is only valid during or after prolog/epilog code emission. - /// + + /// ensureMaxAlignment - Make sure the function is at least Align bytes + /// aligned. + void ensureMaxAlignment(unsigned Align); + + /// AdjustsStack - Return true if this function adjusts the stack -- e.g., + /// when calling another function. This is only valid during and after + /// prolog/epilog code insertion. + bool adjustsStack() const { return AdjustsStack; } + void setAdjustsStack(bool V) { AdjustsStack = V; } + + /// hasCalls - Return true if the current function has any function calls. bool hasCalls() const { return HasCalls; } void setHasCalls(bool V) { HasCalls = V; } + /// Returns true if the function contains any stack-adjusting inline assembly. + bool hasInlineAsmWithSPAdjust() const { return HasInlineAsmWithSPAdjust; } + void setHasInlineAsmWithSPAdjust(bool B) { HasInlineAsmWithSPAdjust = B; } + /// getMaxCallFrameSize - Return the maximum size of a call frame that must be /// allocated for an outgoing function call. This is only available if /// CallFrameSetup/Destroy pseudo instructions are used by the target, and @@ -255,13 +478,11 @@ public: /// CreateFixedObject - Create a new object at a fixed location on the stack. /// All fixed objects should be created before other objects are created for - /// efficiency. This returns an index with a negative value. + /// efficiency. By default, fixed objects are immutable. This returns an + /// index with a negative value. /// - int CreateFixedObject(uint64_t Size, int64_t SPOffset) { - assert(Size != 0 && "Cannot allocate zero size fixed stack objects!"); - Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset)); - return -++NumFixedObjects; - } + int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable); + /// isFixedObjectIndex - Returns true if the specified index corresponds to a /// fixed stack object. @@ -269,16 +490,47 @@ public: return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects); } + /// isImmutableObjectIndex - Returns true if the specified index corresponds + /// to an immutable object. + bool isImmutableObjectIndex(int ObjectIdx) const { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + return Objects[ObjectIdx+NumFixedObjects].isImmutable; + } + + /// isSpillSlotObjectIndex - Returns true if the specified index corresponds + /// to a spill slot.. + bool isSpillSlotObjectIndex(int ObjectIdx) const { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + return Objects[ObjectIdx+NumFixedObjects].isSpillSlot; + } + + /// isDeadObjectIndex - Returns true if the specified index corresponds to + /// a dead object. + bool isDeadObjectIndex(int ObjectIdx) const { + assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && + "Invalid Object Idx!"); + return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL; + } + /// CreateStackObject - Create a new statically sized stack object, returning - /// a postive identifier to represent it. + /// a nonnegative identifier to represent it. + /// + int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS, + const AllocaInst *Alloca = 0); + + /// CreateSpillStackObject - Create a new statically sized stack object that + /// represents a spill slot, returning a nonnegative identifier to represent + /// it. + /// + int CreateSpillStackObject(uint64_t Size, unsigned Alignment); + + /// RemoveStackObject - Remove or mark dead a statically sized stack object. /// - int CreateStackObject(uint64_t Size, unsigned Alignment) { - // Keep track of the maximum alignment. - if (MaxAlignment < Alignment) MaxAlignment = Alignment; - - assert(Size != 0 && "Cannot allocate zero size stack objects!"); - Objects.push_back(StackObject(Size, Alignment, -1)); - return Objects.size()-NumFixedObjects-1; + void RemoveStackObject(int ObjectIdx) { + // Mark it dead. + Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL; } /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a @@ -286,13 +538,8 @@ public: /// variable sized object is created, whether or not the index returned is /// actually used. /// - int CreateVariableSizedObject() { - HasVarSizedObjects = true; - if (MaxAlignment < 1) MaxAlignment = 1; - Objects.push_back(StackObject(0, 1, -1)); - return Objects.size()-NumFixedObjects-1; - } - + int CreateVariableSizedObject(unsigned Alignment, const AllocaInst *Alloca); + /// getCalleeSavedInfo - Returns a reference to call saved info vector for the /// current function. const std::vector &getCalleeSavedInfo() const { @@ -301,24 +548,32 @@ public: /// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's /// callee saved information. - void setCalleeSavedInfo(const std::vector &CSI) { + void setCalleeSavedInfo(const std::vector &CSI) { CSInfo = CSI; } - /// getMachineModuleInfo - Used by a prologue/epilogue emitter (MRegisterInfo) - /// to provide frame layout information. - MachineModuleInfo *getMachineModuleInfo() const { return MMI; } + /// isCalleeSavedInfoValid - Has the callee saved info been calculated yet? + bool isCalleeSavedInfoValid() const { return CSIValid; } + + void setCalleeSavedInfoValid(bool v) { CSIValid = v; } - /// setMachineModuleInfo - Used by a meta info consumer (DwarfWriter) to - /// indicate that frame layout information should be gathered. - void setMachineModuleInfo(MachineModuleInfo *mmi) { MMI = mmi; } + /// getPristineRegs - Return a set of physical registers that are pristine on + /// entry to the MBB. + /// + /// Pristine registers hold a value that is useless to the current function, + /// but that must be preserved - they are callee saved registers that have not + /// been saved yet. + /// + /// Before the PrologueEpilogueInserter has placed the CSR spill code, this + /// method always returns an empty set. + BitVector getPristineRegs(const MachineBasicBlock *MBB) const; /// print - Used by the MachineFunction printer to print information about - /// stack objects. Implemented in MachineFunction.cpp + /// stack objects. Implemented in MachineFunction.cpp /// - void print(const MachineFunction &MF, std::ostream &OS) const; + void print(const MachineFunction &MF, raw_ostream &OS) const; - /// dump - Call print(MF, std::cerr) to be called from the debugger. + /// dump - Print the function to stderr. void dump(const MachineFunction &MF) const; };