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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
//===- LiveDebugVariables.h - Tracking debug info variables -----*- 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 provides the interface to the LiveDebugVariables analysis.
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//
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// The analysis removes DBG_VALUE instructions for virtual registers and tracks
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// live user variables in a data structure that can be updated during register
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// allocation.
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//
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// After register allocation new DBG_VALUE instructions are emitted to reflect
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// the new locations of user variables.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
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#define LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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template <typename T> class ArrayRef;
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class LiveIntervals;
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class VirtRegMap;
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class LLVM_LIBRARY_VISIBILITY LiveDebugVariables : public MachineFunctionPass {
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void *pImpl = nullptr;
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public:
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static char ID; // Pass identification, replacement for typeid
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LiveDebugVariables();
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~LiveDebugVariables() override;
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/// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
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/// @param OldReg Old virtual register that is going away.
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/// @param NewReg New register holding the user variables.
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/// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub-
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/// register.
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void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
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/// splitRegister - Move any user variables in OldReg to the live ranges in
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/// NewRegs where they are live. Mark the values as unavailable where no new
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/// register is live.
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void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
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LiveIntervals &LIS);
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/// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
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/// that happened during register allocation.
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/// @param VRM Rename virtual registers according to map.
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void emitDebugValues(VirtRegMap *VRM);
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/// dump - Print data structures to dbgs().
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void dump() const;
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private:
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bool runOnMachineFunction(MachineFunction &) override;
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void releaseMemory() override;
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void getAnalysisUsage(AnalysisUsage &) const override;
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bool doInitialization(Module &) override;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
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