LLVM: llvm::M68kFrameLowering Class Reference (original) (raw)
#include "[Target/M68k/M68kFrameLowering.h](M68kFrameLowering%5F8h%5Fsource.html)"
| Public Member Functions | |
|---|---|
| M68kFrameLowering (const M68kSubtarget &sti, Align Alignment) | |
| MachineBasicBlock::iterator | eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) 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). | |
| void | emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const override |
| Insert prolog code into the function. | |
| void | emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const override |
| Insert epilog code into the function. | |
| 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. | |
| bool | assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI) const override |
| Allows target to override spill slot assignment logic. | |
| bool | spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, ArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const override |
| 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(). | |
| bool | restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, MutableArrayRef< CalleeSavedInfo > CSI, const TargetRegisterInfo *TRI) const override |
| 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(). | |
| bool | hasReservedCallFrame (const MachineFunction &MF) const override |
| 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. | |
| bool | canSimplifyCallFramePseudos (const MachineFunction &MF) const override |
| If there is a reserved call frame, the call frame pseudos can be simplified. | |
| bool | needsFrameIndexResolution (const MachineFunction &MF) const override |
| StackOffset | getFrameIndexReference (const MachineFunction &MF, int FI, Register &FrameReg) const override |
| This method should return the base register and offset used to reference a frame index location. | |
| int | mergeSPUpdates (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, bool doMergeWithPrevious) const |
| Check the instruction before/after the passed instruction. | |
| void | emitSPUpdate (MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, int64_t NumBytes, bool InEpilogue) const |
| Emit a series of instructions to increment / decrement the stack pointer by a constant value. | |
| Public Member Functions inherited from llvm::TargetFrameLowering | |
| TargetFrameLowering (StackDirection D, Align StackAl, int LAO, Align TransAl=Align(1), bool StackReal=true) | |
| virtual | ~TargetFrameLowering () |
| StackDirection | getStackGrowthDirection () const |
| getStackGrowthDirection - Return the direction the stack grows | |
| unsigned | getStackAlignment () const |
| getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function. | |
| Align | getStackAlign () const |
| getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function. | |
| virtual uint64_t | getStackThreshold () const |
| getStackThreshold - Return the maximum stack size | |
| int | alignSPAdjust (int SPAdj) const |
| alignSPAdjust - This method aligns the stack adjustment to the correct alignment. | |
| Align | getTransientStackAlign () const |
| getTransientStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned at all times, even between calls. | |
| bool | isStackRealignable () const |
| isStackRealignable - This method returns whether the stack can be realigned. | |
| virtual bool | isStackIdSafeForLocalArea (unsigned StackId) const |
| This method returns whether or not it is safe for an object with the given stack id to be bundled into the local area. | |
| int | getOffsetOfLocalArea () const |
| getOffsetOfLocalArea - This method returns the offset of the local area from the stack pointer on entrance to a function. | |
| virtual bool | allocateScavengingFrameIndexesNearIncomingSP (const MachineFunction &MF) const |
| Control the placement of special register scavenging spill slots when allocating a stack frame. | |
| virtual const SpillSlot * | getCalleeSavedSpillSlots (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. | |
| virtual bool | targetHandlesStackFrameRounding () const |
| targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time). | |
| virtual bool | enableShrinkWrapping (const MachineFunction &MF) const |
| Returns true if the target will correctly handle shrink wrapping. | |
| 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. | |
| virtual bool | enableCalleeSaveSkip (const MachineFunction &MF) const |
| Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions. | |
| virtual void | emitZeroCallUsedRegs (BitVector RegsToZero, MachineBasicBlock &MBB) const |
| emitZeroCallUsedRegs - Zeros out call used registers. | |
| virtual void | emitCalleeSavedFrameMovesFullCFA (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI) const |
| With basic block sections, emit callee saved frame moves for basic blocks that are in a different section. | |
| virtual bool | enableCFIFixup (const MachineFunction &MF) const |
| Returns true if we may need to fix the unwind information for the function. | |
| virtual bool | enableFullCFIFixup (const MachineFunction &MF) const |
| enableFullCFIFixup - Returns true if we may need to fix the unwind information such that it is accurate for every instruction in the function (e.g. | |
| virtual void | resetCFIToInitialState (MachineBasicBlock &MBB) const |
| Emit CFI instructions that recreate the state of the unwind information upon function entry. | |
| virtual void | inlineStackProbe (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const |
| Replace a StackProbe stub (if any) with the actual probe code inline. | |
| virtual bool | stackProbeFunctionModifiesSP () const |
| Does the stack probe function call return with a modified stack pointer? | |
| virtual void | adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const |
| Adjust the prologue to have the function use segmented stacks. | |
| 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. | |
| void | spillCalleeSavedRegister (MachineBasicBlock &SaveBlock, MachineBasicBlock::iterator MI, const CalleeSavedInfo &CS, const TargetInstrInfo *TII, const TargetRegisterInfo *TRI) const |
| spillCalleeSavedRegister - Default implementation for spilling a single callee saved register. | |
| void | restoreCalleeSavedRegister (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const CalleeSavedInfo &CS, const TargetInstrInfo *TII, const TargetRegisterInfo *TRI) const |
| bool | hasFP (const MachineFunction &MF) const |
| hasFP - Return true if the specified function should have a dedicated frame pointer register. | |
| virtual StackOffset | getFrameIndexReferencePreferSP (const MachineFunction &MF, int FI, Register &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. | |
| virtual StackOffset | getNonLocalFrameIndexReference (const MachineFunction &MF, int FI) const |
| getNonLocalFrameIndexReference - This method returns the offset used to reference a frame index location. | |
| virtual StackOffset | getFrameIndexReferenceFromSP (const MachineFunction &MF, int FI) const |
| getFrameIndexReferenceFromSP - This method returns the offset from the stack pointer to the slot of the specified index. | |
| virtual void | getCalleeSaves (const MachineFunction &MF, BitVector &SavedRegs) const |
| Returns the callee-saved registers as computed by determineCalleeSaves in the BitVector SavedRegs. | |
| 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. | |
| virtual void | processFunctionBeforeFrameIndicesReplaced (MachineFunction &MF, RegScavenger *RS=nullptr) const |
| processFunctionBeforeFrameIndicesReplaced - This method is called immediately before MO_FrameIndex operands are eliminated, but after the frame is finalized. | |
| 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. | |
| virtual bool | canUseAsPrologue (const MachineBasicBlock &MBB) const |
| Check whether or not the given MBB can be used as a prologue for the target. | |
| virtual bool | canUseAsEpilogue (const MachineBasicBlock &MBB) const |
| Check whether or not the given MBB can be used as a epilogue for the target. | |
| virtual TargetStackID::Value | getStackIDForScalableVectors () const |
| Returns the StackID that scalable vectors should be associated with. | |
| virtual bool | isSupportedStackID (TargetStackID::Value ID) const |
| virtual bool | isProfitableForNoCSROpt (const Function &F) const |
| Check if the no-CSR optimisation is profitable for the given function. | |
| virtual int | getInitialCFAOffset (const MachineFunction &MF) const |
| Return initial CFA offset value i.e. | |
| virtual Register | getInitialCFARegister (const MachineFunction &MF) const |
| Return initial CFA register value i.e. | |
| virtual DwarfFrameBase | getDwarfFrameBase (const MachineFunction &MF) const |
| Return the frame base information to be encoded in the DWARF subprogram debug info. | |
| virtual void | spillFPBP (MachineFunction &MF) const |
| If frame pointer or base pointer is clobbered by an instruction, we should spill/restore it around that instruction. | |
| virtual void | emitRemarks (const MachineFunction &MF, MachineOptimizationRemarkEmitter *ORE) const |
| This method is called at the end of prolog/epilog code insertion, so targets can emit remarks based on the final frame layout. |
| Protected Member Functions | |
|---|---|
| bool | hasFPImpl (const MachineFunction &MF) const override |
| Return true if the specified function should have a dedicated frame pointer register. |
Definition at line 28 of file M68kFrameLowering.h.
◆ assignCalleeSavedSpillSlots()
◆ canSimplifyCallFramePseudos()
◆ create()
◆ determineCalleeSaves()
◆ 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. Returns an iterator pointing to the instruction after the replaced one.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 229 of file M68kFrameLowering.cpp.
References llvm::alignTo(), B(), llvm::MCCFIInstruction::createAdjustCfaOffset(), llvm::MCCFIInstruction::createGnuArgsSize(), DL, llvm::DwarfCFI, llvm::M68kMachineFunctionInfo::getHasPushSequences(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getLandingPads(), llvm::TargetFrameLowering::getStackAlignment(), llvm::TargetFrameLowering::hasFP(), hasReservedCallFrame(), I, MBB, mergeSPUpdates(), and llvm::MachineFunction::needsFrameMoves().
◆ emitEpilogue()
Insert epilog code into the function.
Implements llvm::TargetFrameLowering.
Definition at line 668 of file M68kFrameLowering.cpp.
References llvm::MachineInstrBuilder::addReg(), llvm::M68k::addRegIndirectWithDisp(), llvm::alignTo(), assert(), llvm::BuildMI(), DL, emitSPUpdate(), llvm::MachineInstr::FrameDestroy, FramePtr, llvm::M68kMachineFunctionInfo::getCalleeSavedFrameSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::M68kMachineFunctionInfo::getTCReturnAddrDelta(), llvm::TargetFrameLowering::hasFP(), llvm::MachineFrameInfo::hasVarSizedObjects(), isTailCallOpcode(), llvm::RegState::Kill, MBB, MBBI, mergeSPUpdates(), llvm::Offset, Opc, and llvm::MachineInstrBuilder::setMIFlag().
◆ emitPrologue()
Insert prolog code into the function.
Implements llvm::TargetFrameLowering.
Definition at line 473 of file M68kFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::M68k::addRegIndirectWithDisp(), llvm::alignTo(), assert(), llvm::BuildMI(), llvm::MCCFIInstruction::cfiDefCfaOffset(), llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createOffset(), DL, emitSPUpdate(), FramePtr, llvm::MachineInstr::FrameSetup, llvm::M68kMachineFunctionInfo::getCalleeSavedFrameSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::M68kMachineFunctionInfo::getRestoreBasePointer(), llvm::M68kMachineFunctionInfo::getRestoreBasePointerOffset(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::M68kMachineFunctionInfo::getTCReturnAddrDelta(), llvm::TargetFrameLowering::hasFP(), llvm::RegState::Kill, MBB, MBBI, mergeSPUpdates(), llvm::MachineFunction::needsFrameMoves(), llvm::M68kMachineFunctionInfo::setCalleeSavedFrameSize(), llvm::MachineInstrBuilder::setMIFlag(), and llvm::MachineFrameInfo::setOffsetAdjustment().
◆ emitSPUpdate()
Emit a series of instructions to increment / decrement the stack pointer by a constant value.
Definition at line 337 of file M68kFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), DL, findDeadCallerSavedReg(), llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, isRegLiveIn(), MBB, MBBI, MI, llvm::Offset, and Opc.
Referenced by emitEpilogue(), and emitPrologue().
◆ getFrameIndexReference()
This method should return the base register and offset used to reference a frame index location.
The offset is returned directly, and the base register is returned via FrameReg.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 78 of file M68kFrameLowering.cpp.
References assert(), llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::MachineFrameInfo::getStackSize(), llvm::M68kMachineFunctionInfo::getTCReturnAddrDelta(), llvm::TargetFrameLowering::hasFP(), llvm::Offset, and llvm::Align::value().
Referenced by llvm::M68kRegisterInfo::eliminateFrameIndex().
◆ hasFPImpl()
◆ hasReservedCallFrame()
◆ mergeSPUpdates()
◆ needsFrameIndexResolution()
◆ 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 865 of file M68kFrameLowering.cpp.
References llvm::M68k::addFrameReference(), llvm::MachineInstrBuilder::addImm(), llvm::M68k::addMemOperand(), llvm::BuildMI(), DL, llvm::MachineInstr::FrameDestroy, I, llvm::RegState::ImplicitDefine, MBB, MI, MRI, and llvm::MachineInstrBuilder::setMIFlag().
◆ 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 830 of file M68kFrameLowering.cpp.
References llvm::M68k::addFrameReference(), llvm::MachineInstrBuilder::addImm(), llvm::M68k::addMemOperand(), llvm::BuildMI(), DL, llvm::MachineInstr::FrameSetup, llvm::MachineFunction::getRegInfo(), I, llvm::RegState::Implicit, llvm::RegState::ImplicitKill, llvm::MachineRegisterInfo::isLiveIn(), MBB, MI, MRI, and llvm::MachineInstrBuilder::setMIFlag().
The documentation for this class was generated from the following files:
- lib/Target/M68k/M68kFrameLowering.h
- lib/Target/M68k/M68kFrameLowering.cpp