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

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

Definition at line 31 of file HexagonFrameLowering.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 1545 of file HexagonFrameLowering.cpp.

References llvm::MachineFrameInfo::CreateFixedSpillStackObject(), llvm::dbgs(), dump_registers(), llvm::BitVector::find_first(), llvm::BitVector::find_next(), getCalleeSavedSpillSlots(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getName(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getStackAlign(), I, llvm::Register::isValid(), LLVM_DEBUG, llvm_unreachable, llvm::printReg(), llvm::Reserved, Size, TRI, and llvm::Align::value().

◆ canSimplifyCallFramePseudos()

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 72 of file HexagonFrameLowering.h.

◆ 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 2061 of file HexagonFrameLowering.cpp.

References A(), llvm::MachineFrameInfo::CreateSpillStackObject(), llvm::TargetFrameLowering::determineCalleeSaves(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::HexagonRegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFrameInfo(), llvm::TargetRegisterClass::getID(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), llvm::HexagonMachineFunctionInfo::hasEHReturn(), llvm::SetVector< T, Vector, Set, N >::insert(), isOptNone(), MRI, needToReserveScavengingSpillSlots(), NumberScavengerSlots, OptimizeSpillSlots, llvm::BitVector::resize(), and llvm::BitVector::set().

◆ 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 1479 of file HexagonFrameLowering.cpp.

References assert(), I, MBB, MI, and Opc.

◆ emitEpilogue()

◆ emitPrologue()

Perform most of the PEI work here:

• saving/restoring of the callee-saved registers,
• stack frame creation and destruction. Normally, this work is distributed among various functions, but doing it in one place allows shrink-wrapping of the stack frame.

Implements llvm::TargetFrameLowering.

Definition at line 500 of file HexagonFrameLowering.cpp.

References llvm::MachineInstr::addOperand(), B(), llvm::MachineOperand::CreateReg(), EnableShrinkWrapping, llvm::MachineFunction::front(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getNumBlockIDs(), llvm::MachineInstr::getOpcode(), getReturn(), llvm::MachineFunction::getSubtarget(), isRestoreCall(), and MBB.

◆ enableCalleeSaveSkip()

◆ getAlignaInstr()

◆ getCalleeSavedSpillSlots()

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.

Each entry in this array contains a <register,offset> pair, indicating the fixed offset from the incoming stack pointer that each register should be spilled at. If a register is not listed here, the code generator is allowed to spill it anywhere it chooses.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 93 of file HexagonFrameLowering.h.

Referenced by assignCalleeSavedSpillSlots().

◆ getFrameIndexReference()

getFrameIndexReference - This method should return the base register and offset used to reference a frame index location.

Returns the displacement from the frame register to the stack frame of the specified index, along with the frame register used (in output arg FrameReg).

The offset is returned directly, and the base register is returned via FrameReg.

This is the default implementation which is overridden for some targets.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1250 of file HexagonFrameLowering.cpp.

References assert(), FP, llvm::StackOffset::getFixed(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetMachine::getOptLevel(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::TargetFrameLowering::hasFP(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::MachineFrameInfo::isObjectPreAllocated(), llvm::None, and llvm::Offset.

◆ hasFPImpl()

Implements llvm::TargetFrameLowering.

Definition at line 1134 of file HexagonFrameLowering.cpp.

References llvm::TargetOptions::DisableFramePointerElim(), EliminateFramePointer, enableAllocFrameElim(), EnableStackOVFSanitizer, llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getOptLevel(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasCalls(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::None, and llvm::TargetMachine::Options.

◆ hasReservedCallFrame()

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 67 of file HexagonFrameLowering.h.

◆ insertCFIInstructions()

◆ needsAligna()

◆ 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 2694 of file HexagonFrameLowering.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getObjectSize(), Size, llvm::SmallVectorBase< Size_T >::Size, llvm::SmallVectorTemplateCommon< T, typename >::size(), and llvm::stable_sort().

◆ processFunctionBeforeFrameFinalized()

◆ 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 60 of file HexagonFrameLowering.h.

References MBB, MI, 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 52 of file HexagonFrameLowering.h.

References MBB, MI, and TRI.

◆ targetHandlesStackFrameRounding()

◆ FirstVarArgSavedReg

int llvm::HexagonFrameLowering::FirstVarArgSavedReg

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

• lib/Target/Hexagon/HexagonFrameLowering.h
• lib/Target/Hexagon/HexagonFrameLowering.cpp