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LLVM
3.7.0
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#include <SystemZFrameLowering.h>
Public Member Functions | |
| SystemZFrameLowering () | |
| bool | isFPCloseToIncomingSP () const override |
| 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... | |
| const SpillSlot * | getCalleeSavedSpillSlots (unsigned &NumEntries) const override |
| 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... | |
| void | determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS) const override |
| This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved. More... | |
| bool | spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, 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 MBBII, const 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... | |
| void | processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS) const override |
| processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized. More... | |
| 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... | |
| int | getFrameIndexOffset (const MachineFunction &MF, int FI) const override |
| getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index. 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... | |
| void | eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const override |
| 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). More... | |
| uint64_t | getAllocatedStackSize (const MachineFunction &MF) const |
| unsigned | getRegSpillOffset (unsigned Reg) const |
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... | |
| 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... | |
| 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 | assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI) const |
| assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic. 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 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 void | adjustForFrameAllocatePrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const |
| Adjust the prologue to add an allocation at a fixed offset from the frame pointer. More... | |
| virtual bool | noFramePointerElim (const MachineFunction &MF) const |
| Return true if the target needs to disable frame pointer elimination. 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 | getFrameIndexReferenceFromSP (const MachineFunction &MF, int FI, unsigned &FrameReg) const |
| Same as above, except that the 'base register' will always be RSP, not RBP on x86. 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... | |
Additional Inherited Members | |
Public Types inherited from llvm::TargetFrameLowering | |
| enum | StackDirection { StackGrowsUp, StackGrowsDown } |
Definition at line 20 of file SystemZFrameLowering.h.
| SystemZFrameLowering::SystemZFrameLowering | ( | ) |
Definition at line 49 of file SystemZFrameLowering.cpp.
References llvm::array_lengthof(), llvm::IndexedMap< T, ToIndexT >::grow(), and I.
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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 64 of file SystemZFrameLowering.cpp.
References llvm::SystemZ::ArgGPRs, contains(), llvm::TargetFrameLowering::determineCalleeSaves(), llvm::TargetRegisterInfo::getCalleeSavedRegs(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), llvm::SystemZMachineFunctionInfo::getVarArgsFirstGPR(), llvm::MachineFrameInfo::hasCalls(), hasFP(), I, llvm::Function::isVarArg(), llvm::SystemZ::NumArgGPRs, llvm::BitVector::set(), and llvm::BitVector::test().
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overridevirtual |
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.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 503 of file SystemZFrameLowering.cpp.
References llvm::MachineBasicBlock::erase(), hasReservedCallFrame(), and llvm_unreachable.
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overridevirtual |
Implements llvm::TargetFrameLowering.
Definition at line 411 of file SystemZFrameLowering.cpp.
References llvm::DL, emitIncrement(), getAllocatedStackSize(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), llvm::SystemZMachineFunctionInfo::getLowSavedGPR(), llvm::MDNode::getOperand(), llvm::MachineFunction::getSubtarget(), and llvm_unreachable.
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overridevirtual |
emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.
Implements llvm::TargetFrameLowering.
Definition at line 313 of file SystemZFrameLowering.cpp.
References llvm::MachineModuleInfo::addFrameInst(), llvm::MachineBasicBlock::begin(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::SystemZMC::CFAOffsetFromInitialSP, llvm::TargetOpcode::CFI_INSTRUCTION, contains(), llvm::MCCFIInstruction::createDefCfaOffset(), llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createOffset(), llvm::DL, emitIncrement(), llvm::MachineBasicBlock::end(), llvm::MachineFunction::end(), llvm::MachineFunction::front(), llvm::MDNode::get(), getAllocatedStackSize(), llvm::MachineModuleInfo::getContext(), llvm::MCRegisterInfo::getDwarfRegNum(), getFrameIndexOffset(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::SystemZMachineFunctionInfo::getLowSavedGPR(), llvm::MachineFunction::getMMI(), llvm::MCContext::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), hasFP(), I, llvm_unreachable, and llvm::SmallVectorTemplateBase< T, isPodLike >::push_back().
| uint64_t SystemZFrameLowering::getAllocatedStackSize | ( | const MachineFunction & | MF | ) | const |
Definition at line 478 of file SystemZFrameLowering.cpp.
References llvm::SystemZMC::CallFrameSize, llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFrameInfo::hasCalls(), and llvm::MachineFrameInfo::hasVarSizedObjects().
Referenced by emitEpilogue(), emitPrologue(), and getFrameIndexOffset().
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overridevirtual |
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 59 of file SystemZFrameLowering.cpp.
References llvm::array_lengthof().
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overridevirtual |
getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index.
This is the default implementation which is overridden for some targets.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 458 of file SystemZFrameLowering.cpp.
References getAllocatedStackSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getObjectOffset(), llvm::MachineFrameInfo::getOffsetAdjustment(), and llvm::TargetFrameLowering::getOffsetOfLocalArea().
Referenced by llvm::SystemZRegisterInfo::eliminateFrameIndex(), and emitPrologue().
Definition at line 58 of file SystemZFrameLowering.h.
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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 452 of file SystemZFrameLowering.cpp.
References llvm::TargetOptions::DisableFramePointerElim(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasVarSizedObjects(), and llvm::TargetMachine::Options.
Referenced by determineCalleeSaves(), emitPrologue(), llvm::SystemZRegisterInfo::getFrameRegister(), llvm::SystemZRegisterInfo::getReservedRegs(), and restoreCalleeSavedRegisters().
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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 494 of file SystemZFrameLowering.cpp.
Referenced by eliminateCallFramePseudoInstr().
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inlineoverridevirtual |
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.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 27 of file SystemZFrameLowering.h.
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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 269 of file SystemZFrameLowering.cpp.
References llvm::RegScavenger::addScavengingFrameIndex(), llvm::SystemZMC::CallFrameSize, llvm::MachineFrameInfo::CreateStackObject(), llvm::MachineFrameInfo::estimateStackSize(), and llvm::MachineFunction::getFrameInfo().
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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().
Returns false otherwise.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 214 of file SystemZFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), contains(), llvm::RegState::Define, llvm::DL, llvm::MachineBasicBlock::end(), llvm::MCInstrInfo::get(), llvm::SystemZMachineFunctionInfo::getHighSavedGPR(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::SystemZMachineFunctionInfo::getLowSavedGPR(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getSubtarget(), hasFP(), I, llvm::RegState::ImplicitDefine, llvm::TargetInstrInfo::loadRegFromStackSlot(), and TII.
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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 125 of file SystemZFrameLowering.cpp.
References llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addReg(), addSavedGPR(), llvm::SystemZ::ArgGPRs, llvm::BuildMI(), contains(), llvm::DL, llvm::MachineBasicBlock::end(), llvm::MCInstrInfo::get(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getSubtarget(), llvm::SystemZMachineFunctionInfo::getVarArgsFirstGPR(), I, llvm::Function::isVarArg(), llvm::SystemZ::NumArgGPRs, llvm::SystemZMachineFunctionInfo::setHighSavedGPR(), llvm::SystemZMachineFunctionInfo::setLowSavedGPR(), llvm::TargetInstrInfo::storeRegToStackSlot(), and TII.
1.8.6