222 lines
9.7 KiB
C++
222 lines
9.7 KiB
C++
//===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements X86-specific bits of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
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#define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class MachineInstrBuilder;
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class MCCFIInstruction;
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class X86InstrInfo;
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class X86Subtarget;
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class X86RegisterInfo;
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class X86FrameLowering : public TargetFrameLowering {
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public:
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X86FrameLowering(const X86Subtarget &STI, unsigned StackAlignOverride);
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// Cached subtarget predicates.
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const X86Subtarget &STI;
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const X86InstrInfo &TII;
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const X86RegisterInfo *TRI;
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unsigned SlotSize;
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/// Is64Bit implies that x86_64 instructions are available.
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bool Is64Bit;
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bool IsLP64;
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/// True if the 64-bit frame or stack pointer should be used. True for most
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/// 64-bit targets with the exception of x32. If this is false, 32-bit
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/// instruction operands should be used to manipulate StackPtr and FramePtr.
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bool Uses64BitFramePtr;
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unsigned StackPtr;
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/// Emit target stack probe code. This is required for all
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/// large stack allocations on Windows. The caller is required to materialize
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/// the number of bytes to probe in RAX/EAX.
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void emitStackProbe(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
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bool InProlog) const;
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/// Replace a StackProbe inline-stub with the actual probe code inline.
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void inlineStackProbe(MachineFunction &MF,
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MachineBasicBlock &PrologMBB) const override;
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void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL) const;
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/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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/// the function.
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void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void adjustForSegmentedStacks(MachineFunction &MF,
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MachineBasicBlock &PrologueMBB) const override;
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void adjustForHiPEPrologue(MachineFunction &MF,
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MachineBasicBlock &PrologueMBB) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS = nullptr) const override;
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bool
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assignCalleeSavedSpillSlots(MachineFunction &MF,
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const TargetRegisterInfo *TRI,
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std::vector<CalleeSavedInfo> &CSI) const override;
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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bool hasFP(const MachineFunction &MF) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
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bool needsFrameIndexResolution(const MachineFunction &MF) const override;
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int getFrameIndexReference(const MachineFunction &MF, int FI,
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unsigned &FrameReg) const override;
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int getFrameIndexReferenceSP(const MachineFunction &MF,
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int FI, unsigned &SPReg, int Adjustment) const;
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int getFrameIndexReferencePreferSP(const MachineFunction &MF, int FI,
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unsigned &FrameReg,
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bool IgnoreSPUpdates) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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unsigned getWinEHParentFrameOffset(const MachineFunction &MF) const override;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS) const override;
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/// Check the instruction before/after the passed instruction. If
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/// it is an ADD/SUB/LEA instruction it is deleted argument and the
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/// stack adjustment is returned as a positive value for ADD/LEA and
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/// a negative for SUB.
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int mergeSPUpdates(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
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bool doMergeWithPrevious) const;
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/// Emit a series of instructions to increment / decrement the stack
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/// pointer by a constant value.
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void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
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int64_t NumBytes, bool InEpilogue) const;
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/// Check that LEA can be used on SP in an epilogue sequence for \p MF.
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bool canUseLEAForSPInEpilogue(const MachineFunction &MF) const;
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/// Check whether or not the given \p MBB can be used as a prologue
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/// for the target.
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/// The prologue will be inserted first in this basic block.
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/// This method is used by the shrink-wrapping pass to decide if
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/// \p MBB will be correctly handled by the target.
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/// As soon as the target enable shrink-wrapping without overriding
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/// this method, we assume that each basic block is a valid
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/// prologue.
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bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
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/// Check whether or not the given \p MBB can be used as a epilogue
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/// for the target.
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/// The epilogue will be inserted before the first terminator of that block.
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/// This method is used by the shrink-wrapping pass to decide if
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/// \p MBB will be correctly handled by the target.
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bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
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/// Returns true if the target will correctly handle shrink wrapping.
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bool enableShrinkWrapping(const MachineFunction &MF) const override;
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/// Order the symbols in the local stack.
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/// We want to place the local stack objects in some sort of sensible order.
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/// The heuristic we use is to try and pack them according to static number
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/// of uses and size in order to minimize code size.
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void orderFrameObjects(const MachineFunction &MF,
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SmallVectorImpl<int> &ObjectsToAllocate) const override;
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/// convertArgMovsToPushes - This method tries to convert a call sequence
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/// that uses sub and mov instructions to put the argument onto the stack
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/// into a series of pushes.
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/// Returns true if the transformation succeeded, false if not.
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bool convertArgMovsToPushes(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I,
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uint64_t Amount) const;
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/// Wraps up getting a CFI index and building a MachineInstr for it.
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void BuildCFI(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, const MCCFIInstruction &CFIInst) const;
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/// Sets up EBP and optionally ESI based on the incoming EBP value. Only
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/// needed for 32-bit. Used in funclet prologues and at catchret destinations.
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MachineBasicBlock::iterator
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restoreWin32EHStackPointers(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, bool RestoreSP = false) const;
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private:
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uint64_t calculateMaxStackAlign(const MachineFunction &MF) const;
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/// Emit target stack probe as a call to a helper function
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void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
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bool InProlog) const;
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/// Emit target stack probe as an inline sequence.
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void emitStackProbeInline(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, bool InProlog) const;
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/// Emit a stub to later inline the target stack probe.
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void emitStackProbeInlineStub(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, bool InProlog) const;
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/// Aligns the stack pointer by ANDing it with -MaxAlign.
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void BuildStackAlignAND(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
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unsigned Reg, uint64_t MaxAlign) const;
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/// Make small positive stack adjustments using POPs.
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bool adjustStackWithPops(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
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int Offset) const;
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/// Adjusts the stack pointer using LEA, SUB, or ADD.
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MachineInstrBuilder BuildStackAdjustment(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, int64_t Offset,
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bool InEpilogue) const;
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unsigned getPSPSlotOffsetFromSP(const MachineFunction &MF) const;
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unsigned getWinEHFuncletFrameSize(const MachineFunction &MF) const;
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};
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} // End llvm namespace
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#endif
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