LLVM  3.7.0
Public Member Functions | List of all members
llvm::Thumb1FrameLowering Class Reference

#include <Thumb1FrameLowering.h>

Inheritance diagram for llvm::Thumb1FrameLowering:
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Collaboration diagram for llvm::Thumb1FrameLowering:
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Public Member Functions

 Thumb1FrameLowering (const ARMSubtarget &sti)
 
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 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...
 
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 hasReservedCallFrame (const MachineFunction &MF) const override
 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...
 
void eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) 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...
 
- Public Member Functions inherited from llvm::ARMFrameLowering
 ARMFrameLowering (const ARMSubtarget &sti)
 
void fixTCReturn (MachineFunction &MF, MachineBasicBlock &MBB) const
 
bool noFramePointerElim (const MachineFunction &MF) const override
 Return true if the target needs to disable frame pointer elimination. More...
 
bool hasFP (const MachineFunction &MF) const override
 hasFP - Return true if the specified function should have a dedicated frame pointer register. More...
 
bool canSimplifyCallFramePseudos (const MachineFunction &MF) const override
 canSimplifyCallFramePseudos - If there is a reserved call frame, the call frame pseudos can be simplified. More...
 
int getFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg) const override
 getFrameIndexReference - Provide a base+offset reference to an FI slot for debug info. More...
 
int ResolveFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg, int SPAdj) const
 
int getFrameIndexOffset (const MachineFunction &MF, int FI) const override
 getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index. More...
 
void determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS) const override
 This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved. More...
 
void adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &MBB) const override
 Adjust the prologue to have the function use segmented stacks. 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 const SpillSlotgetCalleeSavedSpillSlots (unsigned &NumEntries) const
 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...
 
virtual bool targetHandlesStackFrameRounding () const
 targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time). 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 needsFrameIndexResolution (const MachineFunction &MF) const
 
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 void processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=nullptr) const
 processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized. 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 }
 
- Protected Attributes inherited from llvm::ARMFrameLowering
const ARMSubtargetSTI
 

Detailed Description

Definition at line 24 of file Thumb1FrameLowering.h.

Constructor & Destructor Documentation

Thumb1FrameLowering::Thumb1FrameLowering ( const ARMSubtarget sti)
explicit

Definition at line 24 of file Thumb1FrameLowering.cpp.

Member Function Documentation

void Thumb1FrameLowering::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::ARMFrameLowering.

Definition at line 52 of file Thumb1FrameLowering.cpp.

References Align(), emitSPUpdate(), llvm::MachineBasicBlock::erase(), llvm::MachineInstr::getDebugLoc(), llvm::MachineOperand::getImm(), llvm::ARMSubtarget::getInstrInfo(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::ARMSubtarget::getRegisterInfo(), llvm::TargetFrameLowering::getStackAlignment(), hasReservedCallFrame(), I, llvm::ARMFrameLowering::STI, and TII.

void Thumb1FrameLowering::emitEpilogue ( MachineFunction MF,
MachineBasicBlock MBB 
) const
overridevirtual
void Thumb1FrameLowering::emitPrologue ( MachineFunction MF,
MachineBasicBlock MBB 
) const
overridevirtual

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

Reimplemented from llvm::ARMFrameLowering.

Definition at line 85 of file Thumb1FrameLowering.cpp.

References llvm::AddDefaultPred(), llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::TargetOpcode::CFI_INSTRUCTION, llvm::MCCFIInstruction::createDefCfa(), llvm::MCCFIInstruction::createDefCfaOffset(), llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createOffset(), emitSPUpdate(), llvm::MachineBasicBlock::end(), FramePtr, llvm::MachineInstr::FrameSetup, llvm::MachineFunction::front(), llvm::ARMFunctionInfo::getArgRegsSaveSize(), llvm::ARMBaseRegisterInfo::getBaseRegister(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MCRegisterInfo::getDwarfRegNum(), llvm::MachineFunction::getFrameInfo(), llvm::ARMFunctionInfo::getFramePtrSpillOffset(), llvm::ARMBaseRegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::ARMSubtarget::getInstrInfo(), llvm::MachineFunction::getMMI(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getOffsetAdjustment(), llvm::ARMSubtarget::getRegisterInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::ARMBaseRegisterInfo::hasBasePointer(), llvm::ARMFrameLowering::hasFP(), llvm::ARMFunctionInfo::hasStackFrame(), llvm::MachineFrameInfo::hasVarSizedObjects(), I, llvm::ARMSubtarget::isTargetELF(), llvm::ARMSubtarget::isTargetMachO(), llvm::ARMBaseRegisterInfo::needsStackRealignment(), R2, R4, R6, llvm::report_fatal_error(), llvm::ARMFunctionInfo::setDPRCalleeSavedAreaOffset(), llvm::ARMFunctionInfo::setDPRCalleeSavedAreaSize(), llvm::ARMFunctionInfo::setFramePtrSpillOffset(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea1Offset(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea1Size(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea2Offset(), llvm::ARMFunctionInfo::setGPRCalleeSavedArea2Size(), llvm::MachineInstrBuilder::setMIFlags(), llvm::MachineFrameInfo::setOffsetAdjustment(), llvm::ARMFunctionInfo::setShouldRestoreSPFromFP(), llvm::MachineFrameInfo::setStackSize(), llvm::ARMFrameLowering::STI, TII, and llvm::tryFoldSPUpdateIntoPushPop().

bool Thumb1FrameLowering::hasReservedCallFrame ( const MachineFunction MF) const
overridevirtual

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::ARMFrameLowering.

Definition at line 27 of file Thumb1FrameLowering.cpp.

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

Referenced by eliminateCallFramePseudoInstr().

bool Thumb1FrameLowering::restoreCalleeSavedRegisters ( MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI,
const std::vector< CalleeSavedInfo > &  CSI,
const TargetRegisterInfo TRI 
) const
overridevirtual
bool Thumb1FrameLowering::spillCalleeSavedRegisters ( MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI,
const std::vector< CalleeSavedInfo > &  CSI,
const TargetRegisterInfo TRI 
) const
overridevirtual

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