#include <SystemZFrameLowering.h>

Inheritance diagram for llvm::SystemZFrameLowering:

Collaboration diagram for llvm::SystemZFrameLowering:

Public Member Functions
	SystemZFrameLowering (const SystemZTargetMachine &tm, const SystemZSubtarget &sti)

virtual bool	isFPCloseToIncomingSP () const LLVM_OVERRIDE

virtual const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const LLVM_OVERRIDE

virtual void	processFunctionBeforeCalleeSavedScan (MachineFunction &MF, RegScavenger *RS) const LLVM_OVERRIDE

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

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

virtual void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS) const

virtual void	emitPrologue (MachineFunction &MF) const LLVM_OVERRIDE

virtual void	emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const LLVM_OVERRIDE

virtual bool	hasFP (const MachineFunction &MF) const LLVM_OVERRIDE

virtual int	getFrameIndexOffset (const MachineFunction &MF, int FI) const LLVM_OVERRIDE

virtual bool	hasReservedCallFrame (const MachineFunction &MF) const LLVM_OVERRIDE

virtual void	eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const LLVM_OVERRIDE

uint64_t	getAllocatedStackSize (const MachineFunction &MF) const

unsigned	getRegSpillOffset (unsigned Reg) 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	targetHandlesStackFrameRounding () const

virtual void	adjustForSegmentedStacks (MachineFunction &MF) const

virtual void	adjustForHiPEPrologue (MachineFunction &MF) const

virtual bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const

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

Protected Attributes
const SystemZTargetMachine &	TM

const SystemZSubtarget &	STI

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

Detailed Description

Definition at line 21 of file SystemZFrameLowering.h.

Constructor & Destructor Documentation

SystemZFrameLowering::SystemZFrameLowering	(	const SystemZTargetMachine &	tm,
		const SystemZSubtarget &	sti
	)

Definition at line 47 of file SystemZFrameLowering.cpp.

References llvm::array_lengthof(), llvm::IndexedMap< T, ToIndexT >::grow(), and I.

Member Function Documentation

void SystemZFrameLowering::eliminateCallFramePseudoInstr	(	MachineFunction &	MF,
		MachineBasicBlock &	MBB,
		MachineBasicBlock::iterator	MI
	)		const

virtual

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 507 of file SystemZFrameLowering.cpp.

References llvm::MachineBasicBlock::erase(), hasReservedCallFrame(), and llvm_unreachable.

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

virtual

Implements llvm::TargetFrameLowering.

Definition at line 415 of file SystemZFrameLowering.cpp.

References emitIncrement(), getAllocatedStackSize(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::SystemZMachineFunctionInfo::getLowSavedGPR(), llvm::SystemZInstrInfo::getOpcodeForOffset(), llvm::MachineFunction::getTarget(), and llvm_unreachable.

void SystemZFrameLowering::emitPrologue ( MachineFunction & MF ) const

virtual

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

Implements llvm::TargetFrameLowering.

Definition at line 312 of file SystemZFrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::MachineBasicBlock::begin(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::SystemZMC::CFAOffsetFromInitialSP, llvm::MCCFIInstruction::createDefCfaOffset(), llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createOffset(), llvm::MCContext::CreateTempSymbol(), emitIncrement(), llvm::MachineBasicBlock::end(), llvm::MachineFunction::end(), llvm::MachineFunction::front(), getAllocatedStackSize(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineModuleInfo::getContext(), llvm::MCRegisterInfo::getDwarfRegNum(), getFrameIndexOffset(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::SystemZMachineFunctionInfo::getLowSavedGPR(), llvm::MachineFunction::getMMI(), llvm::MCContext::getRegisterInfo(), llvm::MachineFunction::getTarget(), hasFP(), I, llvm_unreachable, MRI, llvm::next(), and llvm::TargetOpcode::PROLOG_LABEL.

uint64_t SystemZFrameLowering::getAllocatedStackSize ( const MachineFunction & MF ) const

Definition at line 482 of file SystemZFrameLowering.cpp.

References llvm::SystemZMC::CallFrameSize, llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFrameInfo::hasCalls(), and llvm::MachineFrameInfo::hasVarSizedObjects().

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

const TargetFrameLowering::SpillSlot * SystemZFrameLowering::getCalleeSavedSpillSlots ( unsigned & NumEntries ) const

virtual

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 59 of file SystemZFrameLowering.cpp.

References llvm::array_lengthof().

int SystemZFrameLowering::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 462 of file SystemZFrameLowering.cpp.

References getAllocatedStackSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getOffsetAdjustment(), and llvm::TargetFrameLowering::getOffsetOfLocalArea().

Referenced by emitPrologue().

unsigned llvm::SystemZFrameLowering::getRegSpillOffset ( unsigned Reg ) const

inline

Definition at line 72 of file SystemZFrameLowering.h.

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

virtual

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 456 of file SystemZFrameLowering.cpp.

References llvm::TargetOptions::DisableFramePointerElim(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasVarSizedObjects(), and llvm::TargetMachine::Options.

Referenced by emitPrologue(), processFunctionBeforeCalleeSavedScan(), and restoreCalleeSavedRegisters().

bool SystemZFrameLowering::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.

Definition at line 498 of file SystemZFrameLowering.cpp.

Referenced by eliminateCallFramePseudoInstr().

virtual bool llvm::SystemZFrameLowering::isFPCloseToIncomingSP ( ) const

inlinevirtual

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.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 33 of file SystemZFrameLowering.h.

void SystemZFrameLowering::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 65 of file SystemZFrameLowering.cpp.

References llvm::SystemZ::ArgGPRs, llvm::TargetRegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), llvm::TargetMachine::getRegisterInfo(), llvm::MachineFunction::getTarget(), llvm::SystemZMachineFunctionInfo::getVarArgsFirstGPR(), llvm::MachineFrameInfo::hasCalls(), hasFP(), I, llvm::MachineRegisterInfo::isPhysRegUsed(), llvm::Function::isVarArg(), MRI, llvm::SystemZ::NumArgGPRs, and llvm::MachineRegisterInfo::setPhysRegUsed().

void SystemZFrameLowering::processFunctionBeforeFrameFinalized	(	MachineFunction &	MF,
		RegScavenger *	RS
	)		const

virtual

processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized. Once the frame is finalized, MO_FrameIndex operands are replaced with direct constants. This method is optional.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 268 of file SystemZFrameLowering.cpp.

References llvm::RegScavenger::addScavengingFrameIndex(), llvm::SystemZMC::CallFrameSize, llvm::MachineFrameInfo::CreateStackObject(), llvm::MachineFrameInfo::estimateStackSize(), and llvm::MachineFunction::getFrameInfo().

bool SystemZFrameLowering::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.

Definition at line 213 of file SystemZFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::RegState::Define, llvm::MachineBasicBlock::end(), llvm::MCInstrInfo::get(), llvm::SystemZMachineFunctionInfo::getHighSavedGPR(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::SystemZMachineFunctionInfo::getLowSavedGPR(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getTarget(), hasFP(), I, llvm::RegState::ImplicitDefine, llvm::TargetInstrInfo::loadRegFromStackSlot(), and TII.

bool SystemZFrameLowering::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.

Definition at line 124 of file SystemZFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addReg(), addSavedGPR(), llvm::SystemZ::ArgGPRs, llvm::BuildMI(), llvm::MachineBasicBlock::end(), llvm::MCInstrInfo::get(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getTarget(), llvm::SystemZMachineFunctionInfo::getVarArgsFirstGPR(), I, llvm::Function::isVarArg(), llvm::SystemZ::NumArgGPRs, llvm::SystemZMachineFunctionInfo::setHighSavedGPR(), llvm::SystemZMachineFunctionInfo::setLowSavedGPR(), llvm::TargetInstrInfo::storeRegToStackSlot(), TII, and TM.