llvm::ARMFrameLowering Class Reference

#include <ARMFrameLowering.h>

Inheritance diagram for llvm::ARMFrameLowering:

Collaboration diagram for llvm::ARMFrameLowering:

Public Member Functions
	ARMFrameLowering (const ARMSubtarget &sti)
void	emitPrologue (MachineFunction &MF) const
void	emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const
bool	spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const
bool	restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const
bool	hasFP (const MachineFunction &MF) const
bool	hasReservedCallFrame (const MachineFunction &MF) const
bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const
int	getFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg) const
int	ResolveFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg, int SPAdj) const
int	getFrameIndexOffset (const MachineFunction &MF, int FI) const
void	processFunctionBeforeCalleeSavedScan (MachineFunction &MF, RegScavenger *RS) const
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
unsigned	getStackAlignment () const
unsigned	getTransientStackAlignment () const
bool	isStackRealignable () const
int	getOffsetOfLocalArea () const
virtual bool	isFPCloseToIncomingSP () const
virtual const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const
virtual bool	targetHandlesStackFrameRounding () const
virtual void	adjustForSegmentedStacks (MachineFunction &MF) const
virtual void	adjustForHiPEPrologue (MachineFunction &MF) const
virtual void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=NULL) const

Protected Attributes
const ARMSubtarget &	STI

Additional Inherited Members
Public Types inherited from llvm::TargetFrameLowering
enum	StackDirection { StackGrowsUp, StackGrowsDown }

Detailed Description

Definition at line 24 of file ARMFrameLowering.h.

Constructor & Destructor Documentation

llvm::ARMFrameLowering::ARMFrameLowering ( const ARMSubtarget &  sti )

inlineexplicit

Definition at line 29 of file ARMFrameLowering.h.

Member Function Documentation

bool ARMFrameLowering::canSimplifyCallFramePseudos ( const MachineFunction &  MF ) const

virtual

canSimplifyCallFramePseudos - If there is a reserved call frame, the call frame pseudos can be simplified. Unlike most targets, having a FP is not sufficient here since we still may reference some objects via SP even when FP is available in Thumb2 mode.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 81 of file ARMFrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), hasReservedCallFrame(), and llvm::MachineFrameInfo::hasVarSizedObjects().

Referenced by processFunctionBeforeCalleeSavedScan().

void ARMFrameLowering::emitEpilogue ( MachineFunction &  MF, MachineBasicBlock &  MBB  ) const

virtual

Implements llvm::TargetFrameLowering.

Reimplemented in llvm::Thumb1FrameLowering.

Definition at line 361 of file ARMFrameLowering.cpp.

References llvm::AddDefaultPred(), llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addGlobalAddress(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstr::addOperand(), llvm::MachineInstrBuilder::addReg(), llvm::ARMCC::AL, Align(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::emitARMRegPlusImmediate(), llvm::emitSPUpdate(), llvm::emitT2RegPlusImmediate(), llvm::MachineBasicBlock::erase(), llvm::ARMFunctionInfo::getArgRegsSaveSize(), llvm::Function::getCallingConv(), llvm::ARMFunctionInfo::getDPRCalleeSavedAreaSize(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getFrameLowering(), llvm::ARMFunctionInfo::getFramePtrSpillOffset(), llvm::MachineFunction::getFunction(), llvm::MachineOperand::getGlobal(), llvm::ARMFunctionInfo::getGPRCalleeSavedArea1Size(), llvm::ARMFunctionInfo::getGPRCalleeSavedArea2Size(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::MachineOperand::getOffset(), llvm::MachineOperand::getReg(), llvm::MachineFunction::getRegInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineOperand::getSymbolName(), llvm::MachineFunction::getTarget(), llvm::MachineOperand::getTargetFlags(), llvm::CallingConv::GHC, llvm::ARMFunctionInfo::hasStackFrame(), isCSRestore(), llvm::MachineOperand::isGlobal(), llvm::MachineRegisterInfo::isPhysRegUsed(), llvm::isPopOpcode(), llvm::MachineOperand::isSymbol(), llvm::ARMSubtarget::isTargetIOS(), llvm::ARMSubtarget::isThumb(), llvm::ARMFunctionInfo::isThumb1OnlyFunction(), llvm::ARMFunctionInfo::isThumbFunction(), llvm::RegState::Kill, llvm::prior(), R4, llvm::ARMFunctionInfo::shouldRestoreSPFromFP(), STI, TII, and llvm::tryFoldSPUpdateIntoPushPop().

void ARMFrameLowering::emitPrologue ( MachineFunction &  MF ) const

virtual

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

Implements llvm::TargetFrameLowering.

Reimplemented in llvm::Thumb1FrameLowering.

Definition at line 139 of file ARMFrameLowering.cpp.

References llvm::AddDefaultCC(), llvm::AddDefaultPred(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::ARMCC::AL, Align(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::X86II::D8, emitRegPlusImmediate(), llvm::emitSPUpdate(), llvm::MachineBasicBlock::end(), llvm::MachineInstr::FrameSetup, llvm::MachineFunction::front(), llvm::ARMFunctionInfo::getArgRegsSaveSize(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getFrameLowering(), llvm::ARMFunctionInfo::getFramePtrSpillOffset(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineFrameInfo::getMaxAlignment(), llvm::ARMFunctionInfo::getNumAlignedDPRCS2Regs(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getOffsetAdjustment(), llvm::TargetMachine::getRegisterInfo(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getTarget(), llvm::CallingConv::GHC, hasFP(), llvm::ARMFunctionInfo::hasStackFrame(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::ARMSubtarget::isTargetELF(), llvm::ARMSubtarget::isTargetIOS(), llvm::ARMFunctionInfo::isThumb1OnlyFunction(), llvm::ARMFunctionInfo::isThumbFunction(), llvm::RegState::Kill, R2, R4, R6, llvm::ARMFunctionInfo::setDPRCalleeSavedAreaOffset(), llvm::ARMFunctionInfo::setDPRCalleeSavedAreaSize(), llvm::ARMFunctionInfo::setFramePtrSpillOffset(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea1Offset(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea1Size(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea2Offset(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea2Size(), llvm::MachineFrameInfo::setOffsetAdjustment(), llvm::ARMFunctionInfo::setShouldRestoreSPFromFP(), skipAlignedDPRCS2Spills(), STI, TII, and llvm::tryFoldSPUpdateIntoPushPop().

int ARMFrameLowering::getFrameIndexOffset ( const MachineFunction &  MF, int  FI  ) const

virtual

getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index.

getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index. This is the default implementation which is overridden for some targets.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 586 of file ARMFrameLowering.cpp.

References getFrameIndexReference().

int ARMFrameLowering::getFrameIndexReference ( const MachineFunction &  MF, int  FI, unsigned &  FrameReg  ) const

virtual

getFrameIndexReference - Provide a base+offset reference to an FI slot for debug info. It's the same as what we use for resolving the code-gen references for now. FIXME: This can go wrong when references are SP-relative and simple call frames aren't used.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 505 of file ARMFrameLowering.cpp.

References ResolveFrameIndexReference().

Referenced by getFrameIndexOffset().

bool ARMFrameLowering::hasFP ( const MachineFunction &  MF ) const

virtual

hasFP - Return true if the specified function should have a dedicated frame pointer register. This is true if the function has variable sized allocas or if frame pointer elimination is disabled.

Implements llvm::TargetFrameLowering.

Definition at line 42 of file ARMFrameLowering.cpp.

References llvm::TargetOptions::DisableFramePointerElim(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasCalls(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFrameAddressTaken(), llvm::ARMSubtarget::isTargetIOS(), llvm::TargetRegisterInfo::needsStackRealignment(), llvm::TargetMachine::Options, and STI.

Referenced by llvm::Thumb1FrameLowering::emitPrologue(), emitPrologue(), processFunctionBeforeCalleeSavedScan(), and ResolveFrameIndexReference().

bool ARMFrameLowering::hasReservedCallFrame ( const MachineFunction &  MF ) const

virtual

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. This eliminates the need for add/sub sp brackets around call sites. Returns true if the call frame is included as part of the stack frame.

Reimplemented from llvm::TargetFrameLowering.

Reimplemented in llvm::Thumb1FrameLowering.

Definition at line 63 of file ARMFrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getMaxCallFrameSize(), and llvm::MachineFrameInfo::hasVarSizedObjects().

Referenced by canSimplifyCallFramePseudos(), llvm::ARMBaseRegisterInfo::eliminateFrameIndex(), and ResolveFrameIndexReference().

void ARMFrameLowering::processFunctionBeforeCalleeSavedScan ( MachineFunction &  MF, RegScavenger *  RS  ) const

virtual

processFunctionBeforeCalleeSavedScan - This method is called immediately before PrologEpilogInserter scans the physical registers used to determine what callee saved registers should be spilled. This method is optional.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1164 of file ARMFrameLowering.cpp.

References llvm::RegScavenger::addScavengingFrameIndex(), llvm::SmallVectorTemplateCommon< T, typename >::back(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::ARMBaseRegisterInfo::cannotEliminateFrame(), canSimplifyCallFramePseudos(), checkNumAlignedDPRCS2Regs(), llvm::SmallVectorBase::empty(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::SmallVectorImpl< T >::erase(), estimateRSStackSizeLimit(), llvm::SmallVectorTemplateCommon< T, typename >::front(), llvm::TargetRegisterClass::getAlignment(), llvm::ARMFunctionInfo::getArgRegsSaveSize(), llvm::ARMBaseRegisterInfo::getBaseRegister(), llvm::ARMBaseRegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFrameInfo(), llvm::ARMBaseRegisterInfo::getFrameRegister(), GetFunctionSizeInBytes(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineFunction::getRegInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::TargetRegisterClass::getSize(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFunction::getTarget(), llvm::ARMBaseRegisterInfo::hasBasePointer(), hasFP(), llvm::ARMFunctionInfo::hasStackFrame(), llvm::isARMLowRegister(), llvm::MachineRegisterInfo::isPhysRegUsed(), llvm::MachineRegisterInfo::isReserved(), llvm::ARMSubtarget::isTargetIOS(), llvm::ARMFunctionInfo::isThumb1OnlyFunction(), llvm::ARMFunctionInfo::isThumb2Function(), MRI, llvm::ARMBaseRegisterInfo::needsStackRealignment(), llvm::SmallVectorTemplateBase< T, isPodLike >::pop_back(), llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), R2, R4, R6, llvm::ARMFunctionInfo::setHasStackFrame(), llvm::ARMFunctionInfo::setLRIsSpilledForFarJump(), llvm::MachineRegisterInfo::setPhysRegUsed(), llvm::SmallVectorTemplateCommon< T >::size(), llvm::SmallVectorTemplateCommon< T, typename >::size(), and STI.

int ARMFrameLowering::ResolveFrameIndexReference	(	const MachineFunction &	MF,
		int	FI,
		unsigned &	FrameReg,
		int	SPAdj
	)		const

Definition at line 511 of file ARMFrameLowering.cpp.

References llvm::ARMBaseRegisterInfo::getBaseRegister(), llvm::MachineFunction::getFrameInfo(), llvm::ARMFunctionInfo::getFramePtrSpillOffset(), llvm::ARMBaseRegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetMachine::getRegisterInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getTarget(), llvm::ARMBaseRegisterInfo::hasBasePointer(), hasFP(), hasReservedCallFrame(), llvm::ARMFunctionInfo::hasStackFrame(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::ARMFunctionInfo::isThumb2Function(), and llvm::ARMBaseRegisterInfo::needsStackRealignment().

Referenced by llvm::ARMBaseRegisterInfo::eliminateFrameIndex(), and getFrameIndexReference().

bool ARMFrameLowering::restoreCalleeSavedRegisters ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI, const std::vector< CalleeSavedInfo > &  CSI, const TargetRegisterInfo *  TRI  ) const

virtual

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.

Reimplemented in llvm::Thumb1FrameLowering.

Definition at line 1016 of file ARMFrameLowering.cpp.

References emitAlignedDPRCS2Restores(), llvm::ARMFunctionInfo::getArgRegsSaveSize(), llvm::MachineFunction::getInfo(), llvm::ARMFunctionInfo::getNumAlignedDPRCS2Regs(), llvm::MachineBasicBlock::getParent(), llvm::isARMArea1Register(), llvm::isARMArea2Register(), llvm::isARMArea3Register(), and llvm::ARMFunctionInfo::isThumbFunction().

bool ARMFrameLowering::spillCalleeSavedRegisters ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI, const std::vector< CalleeSavedInfo > &  CSI, const TargetRegisterInfo *  TRI  ) const

virtual

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(). Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Reimplemented in llvm::Thumb1FrameLowering.

Definition at line 985 of file ARMFrameLowering.cpp.

References emitAlignedDPRCS2Spills(), llvm::MachineInstr::FrameSetup, llvm::MachineFunction::getInfo(), llvm::ARMFunctionInfo::getNumAlignedDPRCS2Regs(), llvm::MachineBasicBlock::getParent(), llvm::isARMArea1Register(), llvm::isARMArea2Register(), llvm::isARMArea3Register(), and llvm::ARMFunctionInfo::isThumbFunction().

Member Data Documentation

const ARMSubtarget& llvm::ARMFrameLowering::STI

protected

Definition at line 26 of file ARMFrameLowering.h.

Referenced by emitEpilogue(), llvm::Thumb1FrameLowering::emitPrologue(), emitPrologue(), hasFP(), and processFunctionBeforeCalleeSavedScan().

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

• ARMFrameLowering.h
• ARMFrameLowering.cpp