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65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
//===- LiveDebugVariables.h - Tracking debug info variables -----*- 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 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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/// 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(Register OldReg, ArrayRef<Register> 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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