LLVM: llvm::AArch64FrameLowering Class Reference (original) (raw)

#include "[Target/AArch64/AArch64FrameLowering.h](AArch64FrameLowering%5F8h%5Fsource.html)"

Definition at line 32 of file AArch64FrameLowering.h.

◆ assignCalleeSavedSpillSlots()

assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic.

If implemented, assignCalleeSavedSpillSlots() should assign frame slots to all CSI entries and return true. If this method returns false, spill slots will be assigned using generic implementation. assignCalleeSavedSpillSlots() may add, delete or rearrange elements of CSI.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 2756 of file AArch64FrameLowering.cpp.

References assert(), llvm::MachineFrameInfo::CreateStackObject(), llvm::dbgs(), llvm::find_if(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), getStackHazardSize(), llvm::TargetFrameLowering::hasFP(), llvm::AArch64FunctionInfo::hasSwiftAsyncContext(), llvm::AArch64InstrInfo::isFpOrNEON(), llvm::AArch64FunctionInfo::isStackHazardIncludedInCalleeSaveArea(), isTargetWindows(), LLVM_DEBUG, needsWinCFI(), requiresSaveVG(), llvm::MachineFrameInfo::setIsCalleeSavedObjectIndex(), llvm::AArch64FunctionInfo::setStackHazardCSRSlotIndex(), llvm::AArch64FunctionInfo::setSwiftAsyncContextFrameIdx(), and Size.

◆ canUseAsPrologue()

Check whether or not the given MBB can be used as a prologue for the target.

The prologue will be inserted first in this basic block. This method is used by the shrink-wrapping pass to decide if MBB will be correctly handled by the target. As soon as the target enable shrink-wrapping without overriding this method, we assume that each basic block is a valid prologue.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 922 of file AArch64FrameLowering.cpp.

References llvm::MachineFunction::getInfo(), getLiveRegsForEntryMBB(), llvm::MachineFunction::getRegInfo(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), llvm::AArch64Subtarget::getTargetLowering(), llvm::AArch64TargetLowering::hasInlineStackProbe(), llvm::AArch64FunctionInfo::hasStackProbing(), llvm::AArch64FunctionInfo::hasSwiftAsyncContext(), MBB, MRI, requiresSaveVG(), and TRI.

◆ canUseRedZone()

Can this function use the red zone for local allocations.

Definition at line 523 of file AArch64FrameLowering.cpp.

References EnableRedZone, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::AArch64FunctionInfo::getLocalStackSize(), llvm::AArch64TargetLowering::getRedZoneSize(), llvm::MachineFunction::getSubtarget(), llvm::AArch64Subtarget::getTargetLowering(), llvm::MachineFrameInfo::hasCalls(), llvm::TargetFrameLowering::hasFP(), llvm::AArch64FunctionInfo::hasSVEStackSize(), and llvm::AArch64Subtarget::isNeonAvailable().

Referenced by resolveFrameOffsetReference().

◆ determineCalleeSaves()

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. This method should not be called by any passes outside of PEI, because it may change state passed in by MF and RS. The preferred interface outside PEI is getCalleeSaves.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 2485 of file AArch64FrameLowering.cpp.

References llvm::CallingConv::AArch64_SVE_VectorCall, llvm::alignTo(), assert(), contains(), llvm::BitVector::count(), llvm::MachineFrameInfo::CreateSpillStackObject(), llvm::dbgs(), llvm::TargetFrameLowering::determineCalleeSaves(), determineSVEStackSizes(), enableMultiVectorSpillFill(), estimateRSStackSizeLimit(), llvm::MachineFrameInfo::estimateStackSize(), findFreePredicateReg(), llvm::MachineRegisterInfo::getCalleeSavedRegs(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectOffset(), llvm::AArch64FunctionInfo::getPredicateRegForFillSpill(), llvm::MachineFunction::getRegInfo(), llvm::AArch64Subtarget::getRegisterInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), getStackHazardSize(), llvm::MachineFunction::getSubtarget(), llvm::CallingConv::GHC, llvm::TargetFrameLowering::hasFP(), llvm::AArch64FunctionInfo::hasSwiftAsyncContext(), I, llvm::MachineFrameInfo::isCalleeSavedInfoValid(), llvm::MachineRegisterInfo::isPhysRegUsed(), llvm::AArch64FunctionInfo::isStackHazardIncludedInCalleeSaveArea(), llvm::AArch64Subtarget::isTargetWindows(), LLVM_DEBUG, No, llvm::printReg(), produceCompactUnwindFrame(), requiresSaveVG(), llvm::BitVector::reset(), llvm::BitVector::set(), llvm::BitVector::set_bits(), llvm::AArch64FunctionInfo::setCalleeSavedStackSize(), llvm::AArch64FunctionInfo::setCalleeSaveStackHasFreeSpace(), llvm::AArch64FunctionInfo::setHasStackFrame(), llvm::AArch64FunctionInfo::setPredicateRegForFillSpill(), llvm::AArch64FunctionInfo::setSVECalleeSavedStackSize(), Size, llvm::BitVector::test(), TRI, and llvm::CallingConv::Win64.

◆ 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 644 of file AArch64FrameLowering.cpp.

References llvm::alignTo(), assert(), llvm::MachineRegisterInfo::createVirtualRegister(), DL, llvm::emitFrameOffset(), llvm::StackOffset::get(), llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::AArch64Subtarget::getInstrInfo(), llvm::MachineFunction::getRegInfo(), llvm::TargetFrameLowering::getStackAlign(), llvm::MachineFunction::getSubtarget(), llvm::AArch64Subtarget::getTargetLowering(), llvm::AArch64TargetLowering::hasInlineStackProbe(), hasReservedCallFrame(), llvm::MachineFrameInfo::hasVarSizedObjects(), I, MBB, Opc, llvm::AArch64::StackProbeMaxUnprobedStack, and TII.

◆ emitEpilogue()

◆ emitPacRetPlusLeafHardening()

Harden the entire function with pac-ret.

If pac-ret+leaf is requested, we want to harden as much code as possible. This function inserts pac-ret hardening at the points where prologue and epilogue are traditionally inserted, ignoring possible shrink-wrapping optimization.

Definition at line 1175 of file AArch64FrameLowering.cpp.

References llvm::BuildMI(), DL, llvm::MachineInstr::FrameDestroy, llvm::MachineInstr::FrameSetup, llvm::MachineFunction::front(), llvm::AArch64Subtarget::getInstrInfo(), llvm::MachineFunction::getSubtarget(), MBB, MBBI, llvm::MachineInstrBuilder::setMIFlag(), and TII.

Referenced by processFunctionBeforeFrameIndicesReplaced().

◆ emitPrologue()

◆ enableCFIFixup()

◆ enableFullCFIFixup()

◆ enableShrinkWrapping()

◆ enableStackSlotScavenging()

◆ getFrameIndexReference()

◆ getFrameIndexReferenceFromSP()

getFrameIndexReferenceFromSP - This method returns the offset from the stack pointer to the slot of the specified index.

Returns the offset from the stack pointer to the slot of the specified index.

This function serves to provide a comparable offset from a single reference point (the value of the stack-pointer at function entry) that can be used for analysis.

This function serves to provide a comparable offset from a single reference point (the value of the stack-pointer at function entry) that can be used for analysis. This is the default implementation using MachineFrameInfo offsets.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1246 of file AArch64FrameLowering.cpp.

References assert(), llvm::StackOffset::get(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), getPPRStackSize(), llvm::StackOffset::getScalable(), llvm::AArch64FunctionInfo::getSVECalleeSavedStackSize(), getZPRStackSize(), llvm::AArch64FunctionInfo::hasSplitSVEObjects(), isTargetWindows(), and llvm::TargetStackID::ScalableVector.

◆ getFrameIndexReferencePreferSP()

For Win64 AArch64 EH, the offset to the Unwind object is from the SP before the update.

This is easily retrieved as it is exactly the offset that is set in processFunctionBeforeFrameFinalized.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3496 of file AArch64FrameLowering.cpp.

References llvm::dbgs(), llvm::StackOffset::getFixed(), getFrameIndexReference(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), llvm::TargetRegisterInfo::hasStackRealignment(), llvm::AArch64FunctionInfo::hasSVEStackSize(), llvm::MachineFrameInfo::hasVarSizedObjects(), and LLVM_DEBUG.

◆ getNonLocalFrameIndexReference()

◆ getPPRStackSize()

◆ getSEHFrameIndexOffset()

◆ getStackIDForScalableVectors()

◆ getSVEStackSize()

◆ getWinEHFuncletFrameSize()

◆ getWinEHParentFrameOffset()

◆ getZPRStackSize()

◆ hasFPImpl()

hasFPImpl - Return true if the specified function should have a dedicated frame pointer register.

Implements llvm::TargetFrameLowering.

Definition at line 553 of file AArch64FrameLowering.cpp.

References DefaultSafeSPDisplacement, llvm::TargetOptions::DisableFramePointerElim(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getMaxCallFrameSize(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::AArch64FunctionInfo::getSMEFnAttrs(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::AArch64FunctionInfo::hasCalculatedStackSizeSVE(), llvm::MachineFunction::hasEHFunclets(), llvm::MachineFrameInfo::hasPatchPoint(), llvm::MachineFrameInfo::hasStackMap(), llvm::SMEAttrs::hasStreamingBody(), llvm::AArch64FunctionInfo::hasSVEStackSize(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFrameAddressTaken(), llvm::MachineFrameInfo::isMaxCallFrameSizeComputed(), llvm::AArch64FunctionInfo::needsDwarfUnwindInfo(), llvm::TargetMachine::Options, and requiresSaveVG().

◆ hasReservedCallFrame()

◆ isFPReserved()

◆ isStackIdSafeForLocalArea()

◆ isSupportedStackID()

◆ needsWinCFI()

◆ orderFrameObjects()

Order the symbols in the local stack frame.

The list of objects that we want to order is in objectsToAllocate as indices into the MachineFrameInfo. The array can be reordered in any way upon return. The contents of the array, however, may not be modified (i.e. only their order may be changed). By default, just maintain the original order.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 3609 of file AArch64FrameLowering.cpp.

References llvm::dbgs(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::MachineFunction::getFrameInfo(), llvm::MachineOperand::getIndex(), llvm::MachineFunction::getInfo(), getLdStFrameID(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::AArch64FunctionInfo::getStackHazardSlotIndex(), llvm::MachineFrameInfo::getStackID(), llvm::AArch64FunctionInfo::getTaggedBasePointerIndex(), llvm::AArch64FunctionInfo::hasSplitSVEObjects(), llvm::AArch64FunctionInfo::hasStackHazardSlotIndex(), llvm::MachineOperand::isFI(), llvm::AArch64InstrInfo::isFpOrNEON(), LLVM_DEBUG, MBB, MI, OpIndex, OrderFrameObjects, llvm::TargetStackID::ScalableVector, and llvm::stable_sort().

◆ processFunctionBeforeFrameFinalized()

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 2978 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addFrameIndex(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::alignTo(), assert(), llvm::BuildMI(), llvm::MachineFrameInfo::CreateFixedObject(), determineSVEStackSizes(), DL, llvm::MachineInstr::FrameSetup, llvm::MachineFunction::front(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::getKillRegState(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getObjectSize(), llvm::TargetFrameLowering::getStackGrowthDirection(), llvm::MachineFunction::getSubtarget(), llvm::AArch64FunctionInfo::getTailCallReservedStack(), llvm::AArch64FunctionInfo::getVarArgsGPRSize(), llvm::MachineFunction::getWinEHFuncInfo(), H, llvm::WinEHTryBlockMapEntry::HandlerArray, llvm::MachineFunction::hasEHFunclets(), MBB, MBBI, llvm::MachineFrameInfo::setObjectOffset(), llvm::TargetFrameLowering::StackGrowsDown, TII, llvm::Align::value(), and Yes.

◆ processFunctionBeforeFrameIndicesReplaced()

◆ requiresSaveVG()

◆ resetCFIToInitialState()

◆ resolveFrameIndexReference()

◆ resolveFrameOffsetReference()

Definition at line 1356 of file AArch64FrameLowering.cpp.

References assert(), canUseRedZone(), llvm::StackOffset::get(), llvm::AArch64FunctionInfo::getCalleeSaveBaseToFrameRecordOffset(), llvm::AArch64FunctionInfo::getCalleeSavedStackSize(), llvm::Function::getCallingConv(), llvm::StackOffset::getFixed(), llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::AArch64FunctionInfo::getLocalStackSize(), getPPRStackSize(), llvm::StackOffset::getScalable(), llvm::StackOffset::getScalable(), llvm::MachineFunction::getSubtarget(), llvm::AArch64FunctionInfo::getSVECalleeSavedStackSize(), getZPRStackSize(), llvm::MachineFunction::hasEHFunclets(), llvm::TargetFrameLowering::hasFP(), llvm::AArch64FunctionInfo::hasSplitSVEObjects(), llvm::AArch64FunctionInfo::hasStackFrame(), isTargetWindows(), llvm::Function::isVarArg(), llvm::Offset, and llvm::TargetStackID::ScalableVector.

Referenced by resolveFrameIndexReference().

◆ restoreCalleeSavedRegisters()

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 2159 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addMemOperand(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::BuildMI(), computeCalleeSaveRegisterPairs(), llvm::dbgs(), llvm::RegState::Define, DL, enableMultiVectorSpillFill(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::find_if(), llvm::MachineInstr::FrameDestroy, llvm::getDefRegState(), llvm::MachinePointerInfo::getFixedStack(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineFunction::getMachineMemOperand(), llvm::AArch64FunctionInfo::getPredicateRegForFillSpill(), llvm::MachineFunction::getSubtarget(), llvm::TargetFrameLowering::hasFP(), LLVM_DEBUG, MBB, MBBI, llvm::MachineMemOperand::MOLoad, needsWinCFI(), llvm::printReg(), llvm::MachineInstrBuilder::setMIFlag(), llvm::MachineInstrBuilder::setMIFlags(), Size, std::swap(), TII, and TRI.

◆ spillCalleeSavedRegisters()

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 1942 of file AArch64FrameLowering.cpp.

References llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addMemOperand(), llvm::MachineInstrBuilder::addReg(), llvm::MachineInstrBuilder::addRegMask(), llvm::any_of(), assert(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::BuildMI(), computeCalleeSaveRegisterPairs(), llvm::dbgs(), DL, enableMultiVectorSpillFill(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::MachineInstr::FrameSetup, llvm::MachinePointerInfo::getFixedStack(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineFunction::getMachineMemOperand(), llvm::AArch64FunctionInfo::getPredicateRegForFillSpill(), getPrologueDeath(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), llvm::TargetFrameLowering::hasFP(), llvm::RegState::ImplicitDefine, LLVM_DEBUG, llvm::make_scope_exit(), MBB, MI, llvm::MachineMemOperand::MOStore, MRI, needsWinCFI(), llvm::printReg(), llvm::reverse(), llvm::TargetStackID::ScalablePredicateVector, llvm::TargetStackID::ScalableVector, llvm::MachineInstrBuilder::setMIFlag(), llvm::MachineInstrBuilder::setMIFlags(), llvm::MachineFrameInfo::setStackID(), Size, std::swap(), TII, and TRI.

◆ AArch64EpilogueEmitter

◆ AArch64PrologueEmitter

◆ AArch64PrologueEpilogueCommon

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

• lib/Target/AArch64/AArch64FrameLowering.h
• lib/Target/AArch64/AArch64FrameLowering.cpp