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.
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
//===- ARCMachineFunctionInfo.h - ARC 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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//
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// This file declares ARC-specific per-machine-function information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARC_ARCMACHINEFUNCTIONINFO_H
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#define LLVM_LIB_TARGET_ARC_ARCMACHINEFUNCTIONINFO_H
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#include "llvm/CodeGen/MachineFunction.h"
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#include <vector>
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namespace llvm {
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/// ARCFunctionInfo - This class is derived from MachineFunction private
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/// ARC target-specific information for each MachineFunction.
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class ARCFunctionInfo : public MachineFunctionInfo {
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virtual void anchor();
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bool ReturnStackOffsetSet;
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int VarArgsFrameIndex;
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unsigned ReturnStackOffset;
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public:
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explicit ARCFunctionInfo(const Function &F, const TargetSubtargetInfo *STI)
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: ReturnStackOffsetSet(false), VarArgsFrameIndex(0),
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ReturnStackOffset(-1U), MaxCallStackReq(0) {}
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~ARCFunctionInfo() {}
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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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void setVarArgsFrameIndex(int off) { VarArgsFrameIndex = off; }
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int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
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void setReturnStackOffset(unsigned value) {
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assert(!ReturnStackOffsetSet && "Return stack offset set twice");
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ReturnStackOffset = value;
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ReturnStackOffsetSet = true;
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}
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unsigned getReturnStackOffset() const {
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assert(ReturnStackOffsetSet && "Return stack offset not set");
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return ReturnStackOffset;
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}
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unsigned MaxCallStackReq;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARC_ARCMACHINEFUNCTIONINFO_H
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