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c01de3fc6a
the prologue. Do not use basic blocks that have EFLAGS live-in as prologue if we need to realign the stack. Realigning the stack uses AND instruction and this clobbers EFLAGS. An other alternative would have been to save and restore EFLAGS around the stack realignment code, but this is likely inefficient. Fixes PR27531. llvm-svn: 267634
221 lines
9.6 KiB
C++
221 lines
9.6 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 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 TargetInstrInfo &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. Returns instruction just
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/// after the expansion.
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MachineInstr *emitStackProbe(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, 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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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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const 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 getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI,
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unsigned &FrameReg) 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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DebugLoc DL, 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, DebugLoc DL,
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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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MachineInstr *emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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DebugLoc DL, bool InProlog) const;
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/// Emit target stack probe as an inline sequence.
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MachineInstr *emitStackProbeInline(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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DebugLoc DL, bool InProlog) const;
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/// Emit a stub to later inline the target stack probe.
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MachineInstr *emitStackProbeInlineStub(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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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, 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, 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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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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