LLVM  6.0.0svn
Public Member Functions | Static Public Member Functions | List of all members
llvm::XCoreFrameLowering Class Reference

#include "Target/XCore/XCoreFrameLowering.h"

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

 XCoreFrameLowering (const XCoreSubtarget &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, 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...
 
MachineBasicBlock::iterator eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const override
 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 hasFP (const MachineFunction &MF) const override
 hasFP - Return true if the specified function should have a dedicated frame pointer register. More...
 
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...
 
- 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...
 
int alignSPAdjust (int SPAdj) const
 alignSPAdjust - This method aligns the stack adjustment to the correct alignment. 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...
 
virtual unsigned getStackAlignmentSkew (const MachineFunction &MF) const
 Return the skew that has to be applied to stack alignment under certain conditions (e.g. 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 bool enableShrinkWrapping (const MachineFunction &MF) const
 Returns true if the target will correctly handle shrink wrapping. More...
 
virtual bool enableStackSlotScavenging (const MachineFunction &MF) const
 Returns true if the stack slot holes in the fixed and callee-save stack area should be used when allocating other stack locations to reduce stack size. More...
 
virtual void inlineStackProbe (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const
 Replace a StackProbe stub (if any) with the actual probe code inline. 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 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 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 getFrameIndexReferencePreferSP (const MachineFunction &MF, int FI, unsigned &FrameReg, bool IgnoreSPUpdates) const
 Same as getFrameIndexReference, except that the stack pointer (as opposed to the frame pointer) will be the preferred value for FrameReg. More...
 
virtual unsigned getWinEHParentFrameOffset (const MachineFunction &MF) const
 
virtual void orderFrameObjects (const MachineFunction &MF, SmallVectorImpl< int > &objectsToAllocate) const
 Order the symbols in the local stack frame. 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...
 

Static Public Member Functions

static int stackSlotSize ()
 Stack slot size (4 bytes) More...
 
- Static Public Member Functions inherited from llvm::TargetFrameLowering
static bool isSafeForNoCSROpt (const Function *F)
 Check if given function is safe for not having callee saved registers. More...
 

Additional Inherited Members

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

Detailed Description

Definition at line 24 of file XCoreFrameLowering.h.

Constructor & Destructor Documentation

◆ XCoreFrameLowering()

XCoreFrameLowering::XCoreFrameLowering ( const XCoreSubtarget STI)

Definition at line 214 of file XCoreFrameLowering.cpp.

Member Function Documentation

◆ determineCalleeSaves()

void XCoreFrameLowering::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 535 of file XCoreFrameLowering.cpp.

References llvm::MachineFunction::callsEHReturn(), llvm::MachineFunction::callsUnwindInit(), llvm::XCoreFunctionInfo::createEHSpillSlot(), llvm::XCoreFunctionInfo::createFPSpillSlot(), llvm::XCoreFunctionInfo::createLRSpillSlot(), llvm::TargetFrameLowering::determineCalleeSaves(), llvm::MachineFrameInfo::estimateStackSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), hasFP(), llvm::MachineRegisterInfo::isPhysRegModified(), llvm::Function::isVarArg(), MRI, processFunctionBeforeFrameFinalized(), and llvm::BitVector::reset().

◆ eliminateCallFramePseudoInstr()

MachineBasicBlock::iterator XCoreFrameLowering::eliminateCallFramePseudoInstr ( MachineFunction MF,
MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI 
) const
overridevirtual

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. Returns an iterator pointing to the instruction after the replaced one.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 487 of file XCoreFrameLowering.cpp.

References llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Align, assert(), llvm::BuildMI(), llvm::MachineBasicBlock::erase(), llvm::errs(), llvm::MachineInstr::getDebugLoc(), llvm::MachineOperand::getImm(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFunction::getSubtarget(), llvm::TargetFrameLowering::hasReservedCallFrame(), I, llvm::MachineBasicBlock::insert(), isImmU16(), isImmU6(), llvm_unreachable, and TII.

◆ emitEpilogue()

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

◆ emitPrologue()

void XCoreFrameLowering::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 224 of file XCoreFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addMemOperand(), llvm::MachineInstr::addRegisterKilled(), assert(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), EmitCfiOffset(), EmitDefCfaOffset(), EmitDefCfaRegister(), llvm::SmallVectorTemplateCommon< T >::end(), FramePtr, llvm::MachineFunction::front(), llvm::Function::getAttributes(), llvm::MachineModuleInfo::getContext(), llvm::MCRegisterInfo::getDwarfRegNum(), GetEHSpillList(), llvm::CalleeSavedInfo::getFrameIdx(), getFrameIndexMMO(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::XCoreFunctionInfo::getLRSpillSlot(), llvm::MachineFrameInfo::getMaxAlignment(), llvm::MachineFunction::getMMI(), llvm::MachineFrameInfo::getObjectOffset(), llvm::Function::getPersonalityFn(), llvm::CalleeSavedInfo::getReg(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MCContext::getRegisterInfo(), llvm::XCoreFunctionInfo::getSpillLabels(), GetSpillList(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::TargetSubtargetInfo::getTargetLowering(), llvm::AttributeList::hasAttrSomewhere(), llvm::XCoreFunctionInfo::hasEHSpillSlot(), hasFP(), llvm::XCoreFunctionInfo::hasLRSpillSlot(), llvm::Function::hasPersonalityFn(), IfNeededExtSP(), isImmU6(), llvm::RegState::Kill, MaxImmU16, llvm::MachineMemOperand::MOStore, MRI, llvm::XCoreRegisterInfo::needsFrameMoves(), llvm::report_fatal_error(), llvm::reverse(), llvm::SmallVectorTemplateCommon< T >::size(), and TII.

◆ hasFP()

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

◆ processFunctionBeforeFrameFinalized()

void XCoreFrameLowering::processFunctionBeforeFrameFinalized ( MachineFunction MF,
RegScavenger RS = nullptr 
) const
overridevirtual

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 574 of file XCoreFrameLowering.cpp.

References llvm::RegScavenger::addScavengingFrameIndex(), llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Align, assert(), llvm::MachineFrameInfo::CreateStackObject(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::TargetRegisterInfo::getSpillAlignment(), llvm::TargetRegisterInfo::getSpillSize(), llvm::MachineFunction::getSubtarget(), hasFP(), llvm::XCoreFunctionInfo::isLargeFrame(), and llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Size.

Referenced by determineCalleeSaves().

◆ restoreCalleeSavedRegisters()

bool XCoreFrameLowering::restoreCalleeSavedRegisters ( MachineBasicBlock MBB,
MachineBasicBlock::iterator  MI,
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().

If it returns true, and any of the registers in CSI is not restored, it sets the corresponding Restored flag in CSI to false. Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 453 of file XCoreFrameLowering.cpp.

References assert(), llvm::MachineBasicBlock::begin(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getSubtarget(), hasFP(), llvm::TargetInstrInfo::loadRegFromStackSlot(), MI, and TII.

Referenced by spillCalleeSavedRegisters().

◆ spillCalleeSavedRegisters()

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

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 417 of file XCoreFrameLowering.cpp.

References llvm::MachineBasicBlock::addLiveIn(), assert(), llvm::MachineBasicBlock::end(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), llvm::XCoreFunctionInfo::getSpillLabels(), llvm::MachineFunction::getSubtarget(), hasFP(), MI, llvm::XCoreRegisterInfo::needsFrameMoves(), restoreCalleeSavedRegisters(), llvm::SPII::Store, llvm::TargetInstrInfo::storeRegToStackSlot(), and TII.

Referenced by emitEpilogue().

◆ stackSlotSize()

static int llvm::XCoreFrameLowering::stackSlotSize ( )
inlinestatic

Stack slot size (4 bytes)

Definition at line 57 of file XCoreFrameLowering.h.

Referenced by LowerCallResult().


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