LLVM  3.7.0
Public Member Functions | List of all members
llvm::PPCFrameLowering Class Reference

#include <PPCFrameLowering.h>

Inheritance diagram for llvm::PPCFrameLowering:
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Collaboration diagram for llvm::PPCFrameLowering:
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Public Member Functions

 PPCFrameLowering (const PPCSubtarget &STI)
 
unsigned determineFrameLayout (MachineFunction &MF, bool UpdateMF=true, bool UseEstimate=false) const
 determineFrameLayout - Determine the size of the frame and maximum call frame size. More...
 
void emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const override
 emitProlog/emitEpilog - These methods insert prolog and epilog code into the function. More...
 
void emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const override
 
bool hasFP (const MachineFunction &MF) const override
 hasFP - Return true if the specified function should have a dedicated frame pointer register. More...
 
bool needsFP (const MachineFunction &MF) const
 
void replaceFPWithRealFP (MachineFunction &MF) const
 
void determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS=nullptr) const override
 This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved. More...
 
void processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=nullptr) const override
 processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized. More...
 
void addScavengingSpillSlot (MachineFunction &MF, RegScavenger *RS) const
 
bool spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const override
 spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot(). More...
 
void eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const override
 eliminateCallFramePseudoInstr - This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them). More...
 
bool restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const override
 restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot(). More...
 
bool targetHandlesStackFrameRounding () const override
 targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time). More...
 
unsigned getReturnSaveOffset () const
 getReturnSaveOffset - Return the previous frame offset to save the return address. More...
 
unsigned getTOCSaveOffset () const
 getTOCSaveOffset - Return the previous frame offset to save the TOC register – 64-bit SVR4 ABI only. More...
 
unsigned getFramePointerSaveOffset () const
 getFramePointerSaveOffset - Return the previous frame offset to save the frame pointer. More...
 
unsigned getBasePointerSaveOffset () const
 getBasePointerSaveOffset - Return the previous frame offset to save the base pointer. More...
 
unsigned getLinkageSize () const
 getLinkageSize - Return the size of the PowerPC ABI linkage area. More...
 
const SpillSlotgetCalleeSavedSpillSlots (unsigned &NumEntries) const override
 getCalleeSavedSpillSlots - This method returns a pointer to an array of pairs, that contains an entry for each callee saved register that must be spilled to a particular stack location if it is spilled. More...
 
- Public Member Functions inherited from llvm::TargetFrameLowering
 TargetFrameLowering (StackDirection D, unsigned StackAl, int LAO, unsigned TransAl=1, bool StackReal=true)
 
virtual ~TargetFrameLowering ()
 
StackDirection getStackGrowthDirection () const
 getStackGrowthDirection - Return the direction the stack grows More...
 
unsigned getStackAlignment () const
 getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function. More...
 
unsigned getTransientStackAlignment () const
 getTransientStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned at all times, even between calls. More...
 
bool isStackRealignable () const
 isStackRealignable - This method returns whether the stack can be realigned. More...
 
int getOffsetOfLocalArea () const
 getOffsetOfLocalArea - This method returns the offset of the local area from the stack pointer on entrance to a function. More...
 
virtual bool isFPCloseToIncomingSP () const
 isFPCloseToIncomingSP - Return true if the frame pointer is close to the incoming stack pointer, false if it is close to the post-prologue stack pointer. More...
 
virtual bool assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI) const
 assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic. More...
 
virtual void adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
 Adjust the prologue to have the function use segmented stacks. More...
 
virtual void adjustForHiPEPrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
 Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in the assembly prologue to explicitly handle the stack. More...
 
virtual void adjustForFrameAllocatePrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
 Adjust the prologue to add an allocation at a fixed offset from the frame pointer. More...
 
virtual bool noFramePointerElim (const MachineFunction &MF) const
 Return true if the target needs to disable frame pointer elimination. More...
 
virtual bool hasReservedCallFrame (const MachineFunction &MF) const
 hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function. More...
 
virtual bool canSimplifyCallFramePseudos (const MachineFunction &MF) const
 canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination. More...
 
virtual bool needsFrameIndexResolution (const MachineFunction &MF) const
 
virtual int getFrameIndexOffset (const MachineFunction &MF, int FI) const
 getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index. More...
 
virtual int getFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg) const
 getFrameIndexReference - This method should return the base register and offset used to reference a frame index location. More...
 
virtual int getFrameIndexReferenceFromSP (const MachineFunction &MF, int FI, unsigned &FrameReg) const
 Same as above, except that the 'base register' will always be RSP, not RBP on x86. More...
 
virtual bool canUseAsPrologue (const MachineBasicBlock &MBB) const
 Check whether or not the given MBB can be used as a prologue for the target. More...
 
virtual bool canUseAsEpilogue (const MachineBasicBlock &MBB) const
 Check whether or not the given MBB can be used as a epilogue for the target. More...
 

Additional Inherited Members

- Public Types inherited from llvm::TargetFrameLowering
enum  StackDirection { StackGrowsUp, StackGrowsDown }
 

Detailed Description

Definition at line 24 of file PPCFrameLowering.h.

Constructor & Destructor Documentation

PPCFrameLowering::PPCFrameLowering ( const PPCSubtarget STI)

Definition at line 84 of file PPCFrameLowering.cpp.

Member Function Documentation

void PPCFrameLowering::addScavengingSpillSlot ( MachineFunction MF,
RegScavenger RS 
) const
void PPCFrameLowering::determineCalleeSaves ( MachineFunction MF,
BitVector SavedRegs,
RegScavenger RS = nullptr 
) const
overridevirtual

This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.

The default implementation checks populates the SavedRegs bitset with all registers which are modified in the function, targets may override this function to save additional registers. This method also sets up the register scavenger ensuring there is a free register or a frameindex available.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1161 of file PPCFrameLowering.cpp.

References llvm::MachineFrameInfo::CreateFixedObject(), llvm::TargetFrameLowering::determineCalleeSaves(), llvm::PPCFunctionInfo::getBasePointerSaveIndex(), getBasePointerSaveOffset(), llvm::MachineFunction::getFrameInfo(), llvm::PPCFunctionInfo::getFramePointerSaveIndex(), getFramePointerSaveOffset(), llvm::MachineFunction::getInfo(), llvm::PPCFunctionInfo::getPICBasePointerSaveIndex(), llvm::PPCSubtarget::getRegisterInfo(), llvm::PPCFunctionInfo::getTailCallSPDelta(), llvm::MachineFunction::getTarget(), llvm::TargetOptions::GuaranteedTailCallOpt, llvm::PPCRegisterInfo::hasBasePointer(), llvm::PPCSubtarget::isDarwinABI(), llvm::PPCSubtarget::isPPC64(), MustSaveLR(), needsFP(), llvm::TargetMachine::Options, llvm::BitVector::reset(), llvm::PPCFunctionInfo::setBasePointerSaveIndex(), llvm::PPCFunctionInfo::setCRSpillFrameIndex(), llvm::PPCFunctionInfo::setFramePointerSaveIndex(), llvm::PPCFunctionInfo::setMustSaveLR(), llvm::PPCFunctionInfo::setPICBasePointerSaveIndex(), llvm::BitVector::test(), and llvm::PPCFunctionInfo::usesPICBase().

unsigned PPCFrameLowering::determineFrameLayout ( MachineFunction MF,
bool  UpdateMF = true,
bool  UseEstimate = false 
) const
void PPCFrameLowering::eliminateCallFramePseudoInstr ( MachineFunction MF,
MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI 
) const
overridevirtual

eliminateCallFramePseudoInstr - This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them).

It is responsible for eliminating these instructions, replacing them with concrete instructions. This method need only be implemented if using call frame setup/destroy pseudo instructions.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1588 of file PPCFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::MachineBasicBlock::erase(), llvm::MCInstrInfo::get(), llvm::MachineInstr::getDebugLoc(), llvm::PPCSubtarget::getInstrInfo(), llvm::MachineFunction::getTarget(), llvm::TargetOptions::GuaranteedTailCallOpt, I, is64Bit(), llvm::isInt< 16 >(), llvm::PPCSubtarget::isPPC64(), llvm::RegState::Kill, llvm::AArch64CC::MI, llvm::TargetMachine::Options, and TII.

void PPCFrameLowering::emitEpilogue ( MachineFunction MF,
MachineBasicBlock MBB 
) const
overridevirtual

Implements llvm::TargetFrameLowering.

Definition at line 918 of file PPCFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::SmallVectorBase::empty(), llvm::MachineBasicBlock::end(), llvm::CallingConv::Fast, llvm::DebugLoc::get(), llvm::PPCFunctionInfo::getBasePointerSaveIndex(), getBasePointerSaveOffset(), llvm::PPCRegisterInfo::getBaseRegister(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::PPCFunctionInfo::getFramePointerSaveIndex(), getFramePointerSaveOffset(), llvm::MachineFunction::getFunction(), llvm::MachineOperand::getGlobal(), llvm::MachineOperand::getImm(), llvm::MachineFunction::getInfo(), llvm::PPCSubtarget::getInstrInfo(), llvm::getKillRegState(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::PPCFunctionInfo::getMinReservedArea(), llvm::PPCFunctionInfo::getMustSaveCRs(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineOperand::getOffset(), llvm::PPCFunctionInfo::getPICBasePointerSaveIndex(), llvm::PPCSubtarget::getRegisterInfo(), getReturnSaveOffset(), llvm::MachineFrameInfo::getStackSize(), llvm::PPCFunctionInfo::getTailCallSPDelta(), llvm::MachineFunction::getTarget(), llvm::TargetOptions::GuaranteedTailCallOpt, llvm::PPCRegisterInfo::hasBasePointer(), llvm::PPCFunctionInfo::hasFastCall(), hasFP(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineOperand::isImm(), llvm::isInt< 16 >(), llvm::PPCSubtarget::isPPC64(), llvm::PPCSubtarget::isSVR4ABI(), llvm::RegState::Kill, llvm::AArch64DB::LD, llvm::PPCFunctionInfo::mustSaveLR(), MustSaveLR(), llvm::TargetMachine::Options, llvm::SmallVectorTemplateCommon< T, typename >::size(), TII, and llvm::PPCFunctionInfo::usesPICBase().

void PPCFrameLowering::emitPrologue ( MachineFunction MF,
MachineBasicBlock MBB 
) const
overridevirtual

emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.

Implements llvm::TargetFrameLowering.

Definition at line 558 of file PPCFrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::TargetOpcode::CFI_INSTRUCTION, contains(), llvm::MCCFIInstruction::createDefCfaOffset(), llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createOffset(), determineFrameLayout(), llvm::SmallVectorBase::empty(), llvm::MachineBasicBlock::end(), llvm::MachineFunction::front(), llvm::PPCFunctionInfo::getBasePointerSaveIndex(), getBasePointerSaveOffset(), llvm::PPCRegisterInfo::getBaseRegister(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineModuleInfo::getContext(), llvm::MCRegisterInfo::getDwarfRegNum(), llvm::MachineFunction::getFrameInfo(), llvm::PPCFunctionInfo::getFramePointerSaveIndex(), getFramePointerSaveOffset(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::PPCSubtarget::getInstrInfo(), llvm::getKillRegState(), llvm::MachineFrameInfo::getMaxAlignment(), llvm::MachineFunction::getMMI(), llvm::PPCFunctionInfo::getMustSaveCRs(), llvm::MachineFrameInfo::getObjectOffset(), llvm::PPCFunctionInfo::getPICBasePointerSaveIndex(), llvm::PPCSubtarget::getRegisterInfo(), llvm::MCContext::getRegisterInfo(), getReturnSaveOffset(), HandleVRSaveUpdate(), llvm::PPCRegisterInfo::hasBasePointer(), llvm::MachineModuleInfo::hasDebugInfo(), hasFP(), I, llvm::RegState::ImplicitKill, llvm::PPCSubtarget::isDarwinABI(), llvm::PPCSubtarget::isELFv2ABI(), llvm::MachineFrameInfo::isFrameAddressTaken(), llvm::isInt< 16 >(), llvm::isInt< 32 >(), llvm::isPowerOf2_32(), llvm::PPCSubtarget::isPPC64(), llvm::PPCSubtarget::isSVR4ABI(), llvm::RegState::Kill, llvm_unreachable, llvm::Log2_32(), llvm::PPCFunctionInfo::mustSaveLR(), MustSaveLR(), llvm::Function::needsUnwindTableEntry(), OR, replaceFPWithRealFP(), llvm::NVPTX::PTXCvtMode::RM, llvm::SmallVectorTemplateCommon< T, typename >::size(), TII, and llvm::PPCFunctionInfo::usesPICBase().

unsigned llvm::PPCFrameLowering::getBasePointerSaveOffset ( ) const
inline

getBasePointerSaveOffset - Return the previous frame offset to save the base pointer.

Definition at line 87 of file PPCFrameLowering.h.

Referenced by determineCalleeSaves(), emitEpilogue(), and emitPrologue().

const PPCFrameLowering::SpillSlot * PPCFrameLowering::getCalleeSavedSpillSlots ( unsigned NumEntries) const
overridevirtual

getCalleeSavedSpillSlots - This method returns a pointer to an array of pairs, that contains an entry for each callee saved register that must be spilled to a particular stack location if it is spilled.

Each entry in this array contains a <register,offset> pair, indicating the fixed offset from the incoming stack pointer that each register should be spilled at. If a register is not listed here, the code generator is allowed to spill it anywhere it chooses.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 94 of file PPCFrameLowering.cpp.

References llvm::array_lengthof(), llvm::PPCSubtarget::isDarwinABI(), llvm::PPCSubtarget::isPPC64(), and llvm::PPCSubtarget::isSVR4ABI().

unsigned llvm::PPCFrameLowering::getFramePointerSaveOffset ( ) const
inline

getFramePointerSaveOffset - Return the previous frame offset to save the frame pointer.

Definition at line 83 of file PPCFrameLowering.h.

Referenced by determineCalleeSaves(), emitEpilogue(), emitPrologue(), and EmitTailCallStoreFPAndRetAddr().

unsigned llvm::PPCFrameLowering::getLinkageSize ( ) const
inline

getLinkageSize - Return the size of the PowerPC ABI linkage area.

Definition at line 91 of file PPCFrameLowering.h.

Referenced by determineFrameLayout().

unsigned llvm::PPCFrameLowering::getReturnSaveOffset ( ) const
inline

getReturnSaveOffset - Return the previous frame offset to save the return address.

Definition at line 75 of file PPCFrameLowering.h.

Referenced by emitEpilogue(), emitPrologue(), and EmitTailCallStoreFPAndRetAddr().

unsigned llvm::PPCFrameLowering::getTOCSaveOffset ( ) const
inline

getTOCSaveOffset - Return the previous frame offset to save the TOC register – 64-bit SVR4 ABI only.

Definition at line 79 of file PPCFrameLowering.h.

bool PPCFrameLowering::hasFP ( const MachineFunction MF) const
overridevirtual

hasFP - Return true if the specified function should have a dedicated frame pointer register.

For most targets this is true only if the function has variable sized allocas or if frame pointer elimination is disabled.

Implements llvm::TargetFrameLowering.

Definition at line 493 of file PPCFrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getStackSize(), and needsFP().

Referenced by emitEpilogue(), emitPrologue(), llvm::PPCRegisterInfo::getFrameRegister(), and llvm::PPCRegisterInfo::getRegPressureLimit().

bool PPCFrameLowering::needsFP ( const MachineFunction MF) const
void PPCFrameLowering::processFunctionBeforeFrameFinalized ( MachineFunction MF,
RegScavenger RS = nullptr 
) const
overridevirtual
void PPCFrameLowering::replaceFPWithRealFP ( MachineFunction MF) const
bool PPCFrameLowering::restoreCalleeSavedRegisters ( MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI,
const std::vector< CalleeSavedInfo > &  CSI,
const TargetRegisterInfo TRI 
) const
overridevirtual

restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot().

Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1628 of file PPCFrameLowering.cpp.

References llvm::MachineBasicBlock::begin(), llvm::PPCSubtarget::getInstrInfo(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), I, llvm::PPCSubtarget::isDarwinABI(), llvm::PPCSubtarget::isPPC64(), llvm::PPCSubtarget::isSVR4ABI(), llvm::PPCInstrInfo::loadRegFromStackSlot(), llvm::AArch64CC::MI, needsFP(), restoreCRs(), and TII.

bool PPCFrameLowering::spillCalleeSavedRegisters ( MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI,
const std::vector< CalleeSavedInfo > &  CSI,
const TargetRegisterInfo TRI 
) const
overridevirtual
bool llvm::PPCFrameLowering::targetHandlesStackFrameRounding ( ) const
inlineoverridevirtual

targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time).

Reimplemented from llvm::TargetFrameLowering.

Definition at line 71 of file PPCFrameLowering.h.


The documentation for this class was generated from the following files: