69e75ae695
This fixes what I consider to be an API flaw I've tripped over multiple times. The point this is constructed isn't well defined, so depending on where this is first called, you can conclude different information based on the MachineFunction. For example, the AMDGPU implementation inspected the MachineFrameInfo on construction for the stack objects and if the frame has calls. This kind of worked in SelectionDAG which visited all allocas up front, but broke in GlobalISel which hasn't visited any of the IR when arguments are lowered. I've run into similar problems before with the MIR parser and trying to make use of other MachineFunction fields, so I think it's best to just categorically disallow dependency on the MachineFunction state in the constructor and to always construct this at the same time as the MachineFunction itself. A missing feature I still could use is a way to access an custom analysis pass on the IR here.
99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
//=== SystemZMachineFunctionInfo.h - SystemZ machine function info -*- C++ -*-//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
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#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
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#include "llvm/CodeGen/MachineFunction.h"
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namespace llvm {
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namespace SystemZ {
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// A struct to hold the low and high GPR registers to be saved/restored as
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// well as the offset into the register save area of the low register.
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struct GPRRegs {
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unsigned LowGPR;
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unsigned HighGPR;
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unsigned GPROffset;
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GPRRegs() : LowGPR(0), HighGPR(0), GPROffset(0) {}
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};
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}
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class SystemZMachineFunctionInfo : public MachineFunctionInfo {
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virtual void anchor();
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SystemZ::GPRRegs SpillGPRRegs;
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SystemZ::GPRRegs RestoreGPRRegs;
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Register VarArgsFirstGPR;
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Register VarArgsFirstFPR;
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unsigned VarArgsFrameIndex;
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unsigned RegSaveFrameIndex;
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int FramePointerSaveIndex;
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unsigned NumLocalDynamics;
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public:
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SystemZMachineFunctionInfo(const Function &F, const TargetSubtargetInfo *STI)
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: VarArgsFirstGPR(0), VarArgsFirstFPR(0), VarArgsFrameIndex(0),
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RegSaveFrameIndex(0), FramePointerSaveIndex(0), NumLocalDynamics(0) {}
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MachineFunctionInfo *
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clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
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const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB)
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const override;
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// Get and set the first and last call-saved GPR that should be saved by
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// this function and the SP offset for the STMG. These are 0 if no GPRs
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// need to be saved or restored.
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SystemZ::GPRRegs getSpillGPRRegs() const { return SpillGPRRegs; }
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void setSpillGPRRegs(Register Low, Register High, unsigned Offs) {
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SpillGPRRegs.LowGPR = Low;
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SpillGPRRegs.HighGPR = High;
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SpillGPRRegs.GPROffset = Offs;
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}
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// Get and set the first and last call-saved GPR that should be restored by
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// this function and the SP offset for the LMG. These are 0 if no GPRs
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// need to be saved or restored.
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SystemZ::GPRRegs getRestoreGPRRegs() const { return RestoreGPRRegs; }
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void setRestoreGPRRegs(Register Low, Register High, unsigned Offs) {
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RestoreGPRRegs.LowGPR = Low;
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RestoreGPRRegs.HighGPR = High;
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RestoreGPRRegs.GPROffset = Offs;
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}
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// Get and set the number of fixed (as opposed to variable) arguments
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// that are passed in GPRs to this function.
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Register getVarArgsFirstGPR() const { return VarArgsFirstGPR; }
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void setVarArgsFirstGPR(Register GPR) { VarArgsFirstGPR = GPR; }
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// Likewise FPRs.
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Register getVarArgsFirstFPR() const { return VarArgsFirstFPR; }
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void setVarArgsFirstFPR(Register FPR) { VarArgsFirstFPR = FPR; }
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// Get and set the frame index of the first stack vararg.
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unsigned getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
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void setVarArgsFrameIndex(unsigned FI) { VarArgsFrameIndex = FI; }
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// Get and set the frame index of the register save area
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// (i.e. the incoming stack pointer).
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unsigned getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
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void setRegSaveFrameIndex(unsigned FI) { RegSaveFrameIndex = FI; }
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// Get and set the frame index of where the old frame pointer is stored.
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int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
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void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
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// Count number of local-dynamic TLS symbols used.
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unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
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void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
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};
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} // end namespace llvm
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#endif
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