| //===- LiveDebugVariables.h - Tracking debug info variables -----*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file provides the interface to the LiveDebugVariables analysis. |
| // |
| // The analysis removes DBG_VALUE instructions for virtual registers and tracks |
| // live user variables in a data structure that can be updated during register |
| // allocation. |
| // |
| // After register allocation new DBG_VALUE instructions are emitted to reflect |
| // the new locations of user variables. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H |
| #define LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H |
| |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/Support/Compiler.h" |
| |
| namespace llvm { |
| |
| template <typename T> class ArrayRef; |
| class LiveIntervals; |
| class VirtRegMap; |
| |
| class LLVM_LIBRARY_VISIBILITY LiveDebugVariables : public MachineFunctionPass { |
| void *pImpl = nullptr; |
| |
| public: |
| static char ID; // Pass identification, replacement for typeid |
| |
| LiveDebugVariables(); |
| ~LiveDebugVariables() override; |
| |
| /// splitRegister - Move any user variables in OldReg to the live ranges in |
| /// NewRegs where they are live. Mark the values as unavailable where no new |
| /// register is live. |
| void splitRegister(Register OldReg, ArrayRef<Register> NewRegs, |
| LiveIntervals &LIS); |
| |
| /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes |
| /// that happened during register allocation. |
| /// @param VRM Rename virtual registers according to map. |
| void emitDebugValues(VirtRegMap *VRM); |
| |
| /// dump - Print data structures to dbgs(). |
| void dump() const; |
| |
| private: |
| bool runOnMachineFunction(MachineFunction &) override; |
| void releaseMemory() override; |
| void getAnalysisUsage(AnalysisUsage &) const override; |
| }; |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H |