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fa85eb6237
When a frame pointer is not otherwise required, and dynamic stack alignment is necessary solely due to the spilling of a register with larger alignment requirements than the default stack alignment, the frame pointer can be both used as a general purpose register and a frame pointer. That goes poorly, for obvious reasons. This patch brings back a bit of old logic for identifying the use of such registers and conservatively reserves the frame pointer during register allocation in such cases. For now, implement for X86 only since it's 32-bit linux which is hitting this, and we want a targeted fix for 2.7. As a follow-on, this will be expanded to handle other targets, as theoretically the problem could arise elsewhere as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100559 91177308-0d34-0410-b5e6-96231b3b80d8
106 lines
4.0 KiB
C++
106 lines
4.0 KiB
C++
//====- X86MachineFuctionInfo.h - X86 machine function info -----*- 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 file declares X86-specific per-machine-function information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef X86MACHINEFUNCTIONINFO_H
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#define X86MACHINEFUNCTIONINFO_H
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#include "llvm/CodeGen/MachineFunction.h"
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namespace llvm {
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/// X86MachineFunctionInfo - This class is derived from MachineFunction and
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/// contains private X86 target-specific information for each MachineFunction.
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class X86MachineFunctionInfo : public MachineFunctionInfo {
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/// ForceFramePointer - True if the function is required to use of frame
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/// pointer for reasons other than it containing dynamic allocation or
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/// that FP eliminatation is turned off. For example, Cygwin main function
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/// contains stack pointer re-alignment code which requires FP.
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bool ForceFramePointer;
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/// CalleeSavedFrameSize - Size of the callee-saved register portion of the
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/// stack frame in bytes.
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unsigned CalleeSavedFrameSize;
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/// BytesToPopOnReturn - Number of bytes function pops on return.
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/// Used on windows platform for stdcall & fastcall name decoration
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unsigned BytesToPopOnReturn;
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/// ReturnAddrIndex - FrameIndex for return slot.
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int ReturnAddrIndex;
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/// TailCallReturnAddrDelta - The number of bytes by which return address
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/// stack slot is moved as the result of tail call optimization.
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int TailCallReturnAddrDelta;
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/// SRetReturnReg - Some subtargets require that sret lowering includes
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/// returning the value of the returned struct in a register. This field
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/// holds the virtual register into which the sret argument is passed.
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unsigned SRetReturnReg;
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/// GlobalBaseReg - keeps track of the virtual register initialized for
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/// use as the global base register. This is used for PIC in some PIC
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/// relocation models.
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unsigned GlobalBaseReg;
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/// ReserveFP - whether the function should reserve the frame pointer
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/// when allocating, even if there may not actually be a frame pointer used.
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bool ReserveFP;
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public:
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X86MachineFunctionInfo() : ForceFramePointer(false),
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CalleeSavedFrameSize(0),
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BytesToPopOnReturn(0),
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ReturnAddrIndex(0),
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TailCallReturnAddrDelta(0),
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SRetReturnReg(0),
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GlobalBaseReg(0) {}
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explicit X86MachineFunctionInfo(MachineFunction &MF)
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: ForceFramePointer(false),
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CalleeSavedFrameSize(0),
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BytesToPopOnReturn(0),
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ReturnAddrIndex(0),
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TailCallReturnAddrDelta(0),
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SRetReturnReg(0),
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GlobalBaseReg(0),
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ReserveFP(false) {}
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bool getForceFramePointer() const { return ForceFramePointer;}
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void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
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unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
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void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
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unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
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void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
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int getRAIndex() const { return ReturnAddrIndex; }
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void setRAIndex(int Index) { ReturnAddrIndex = Index; }
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int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
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void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
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unsigned getSRetReturnReg() const { return SRetReturnReg; }
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void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
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unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
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void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
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bool getReserveFP() const { return ReserveFP; }
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void setReserveFP(bool reserveFP) { ReserveFP = reserveFP; }
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};
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} // End llvm namespace
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#endif
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