Utilities for creating function call frames. More...
#include "Target/AVR/AVRFrameLowering.h"
Public Member Functions | |
| AVRFrameLowering () | |
| 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 | hasFP (const MachineFunction &MF) const override |
| hasFP - Return true if the specified function should have a dedicated frame pointer register. More... | |
| 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... | |
| 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... | |
| bool | canSimplifyCallFramePseudos (const MachineFunction &MF) const override |
| canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination. 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... | |
| 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). 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 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. 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 bool | enableCalleeSaveSkip (const MachineFunction &MF) const |
| Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions. 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 | keepFramePointer (const MachineFunction &MF) const |
| Return true if the target wants to keep the frame pointer regardless of the function attribute "frame-pointer". 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 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 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... | |
| virtual int | getInitialCFAOffset (const MachineFunction &MF) const |
| Return initial CFA offset value i.e. More... | |
| virtual unsigned | getInitialCFARegister (const MachineFunction &MF) const |
| Return initial CFA register value i.e. More... | |
Additional Inherited Members | |
| Public Types inherited from llvm::TargetFrameLowering | |
| enum | StackDirection { StackGrowsUp, StackGrowsDown } |
| 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... | |
Detailed Description
Utilities for creating function call frames.
Definition at line 18 of file AVRFrameLowering.h.
Constructor & Destructor Documentation
◆ AVRFrameLowering()
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explicit |
Definition at line 33 of file AVRFrameLowering.cpp.
Member Function Documentation
◆ canSimplifyCallFramePseudos()
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overridevirtual |
canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination.
This is possible only when frame index references between the pseudos won't need adjusting for the call frame adjustments. Normally, that's true if the function has a reserved call frame or a frame pointer. Some targets (Thumb2, for example) may have more complicated criteria, however, and can override this behavior.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 36 of file AVRFrameLowering.cpp.
◆ determineCalleeSaves()
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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 417 of file AVRFrameLowering.cpp.
References llvm::TargetFrameLowering::determineCalleeSaves().
◆ eliminateCallFramePseudoInstr()
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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 361 of file AVRFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), assert(), llvm::BuildMI(), llvm::MachineBasicBlock::erase(), llvm::fixStackStores(), llvm::AVRSubtarget::getFrameLowering(), llvm::AVRSubtarget::getInstrInfo(), llvm::MachineInstr::getOperand(), llvm::MachineFunction::getSubtarget(), llvm::RegState::Kill, llvm::MachineOperand::setIsDead(), and TII.
◆ emitEpilogue()
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overridevirtual |
Implements llvm::TargetFrameLowering.
Definition at line 144 of file AVRFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::CallingConv::AVR_INTR, llvm::CallingConv::AVR_SIGNAL, llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::AVRMachineFunctionInfo::getCalleeSavedFrameSize(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::AVRSubtarget::getInstrInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::MachineInstr::getOperand(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), hasFP(), llvm::RegState::Kill, MI, llvm::MachineOperand::setIsDead(), and TII.
◆ emitPrologue()
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overridevirtual |
emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.
Implements llvm::TargetFrameLowering.
Definition at line 53 of file AVRFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::CallingConv::AVR_INTR, llvm::CallingConv::AVR_SIGNAL, llvm::MachineBasicBlock::begin(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::RegState::Define, E, llvm::MachineBasicBlock::end(), llvm::MachineFunction::end(), llvm::MachineInstr::FrameSetup, llvm::DebugLoc::get(), llvm::AVRMachineFunctionInfo::getCalleeSavedFrameSize(), llvm::Function::getCallingConv(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::AVRSubtarget::getInstrInfo(), llvm::MachineInstr::getOperand(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), hasFP(), I, llvm::RegState::Kill, MI, llvm::MachineOperand::setIsDead(), llvm::MachineInstrBuilder::setMIFlag(), and TII.
◆ hasFP()
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overridevirtual |
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 228 of file AVRFrameLowering.cpp.
References llvm::AVRMachineFunctionInfo::getHasAllocas(), llvm::AVRMachineFunctionInfo::getHasSpills(), llvm::AVRMachineFunctionInfo::getHasStackArgs(), and llvm::MachineFunction::getInfo().
Referenced by emitEpilogue(), emitPrologue(), and hasReservedCallFrame().
◆ hasReservedCallFrame()
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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::TargetFrameLowering.
Definition at line 43 of file AVRFrameLowering.cpp.
References llvm::MachineFunction::getFrameInfo(), hasFP(), and llvm::MachineFrameInfo::hasVarSizedObjects().
◆ restoreCalleeSavedRegisters()
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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 276 of file AVRFrameLowering.cpp.
References assert(), llvm::BuildMI(), llvm::MachineBasicBlock::findDebugLoc(), llvm::DebugLoc::get(), llvm::AVRSubtarget::getInstrInfo(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), llvm::TargetRegisterInfo::getRegSizeInBits(), llvm::MachineFunction::getSubtarget(), Reg, and TII.
◆ spillCalleeSavedRegisters()
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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 235 of file AVRFrameLowering.cpp.
References llvm::MachineBasicBlock::addLiveIn(), assert(), llvm::BuildMI(), llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameSetup, llvm::DebugLoc::get(), llvm::MachineFunction::getInfo(), llvm::AVRSubtarget::getInstrInfo(), llvm::getKillRegState(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), llvm::TargetRegisterInfo::getRegSizeInBits(), llvm::MachineFunction::getSubtarget(), llvm::MachineBasicBlock::isLiveIn(), Reg, llvm::AVRMachineFunctionInfo::setCalleeSavedFrameSize(), and TII.
The documentation for this class was generated from the following files:
- lib/Target/AVR/AVRFrameLowering.h
- lib/Target/AVR/AVRFrameLowering.cpp
