//===- LiveDebugVariables.h - Tracking debug info variables ----*- c++ -*--===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // 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_CODEGEN_LIVEDEBUGVARIABLES_H #define LLVM_CODEGEN_LIVEDEBUGVARIABLES_H #include "llvm/ADT/ArrayRef.h" #include "llvm/IR/DebugInfo.h" #include "llvm/CodeGen/MachineFunctionPass.h" namespace llvm { class LiveInterval; class LiveIntervals; class VirtRegMap; class LiveDebugVariables : public MachineFunctionPass { void *pImpl; DenseMap FunctionDIs; public: static char ID; // Pass identification, replacement for typeid LiveDebugVariables(); ~LiveDebugVariables(); /// renameRegister - Move any user variables in OldReg to NewReg:SubIdx. /// @param OldReg Old virtual register that is going away. /// @param NewReg New register holding the user variables. /// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub- /// register. void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx); /// 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(unsigned OldReg, ArrayRef 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(); private: bool runOnMachineFunction(MachineFunction &) override; void releaseMemory() override; void getAnalysisUsage(AnalysisUsage &) const override; bool doInitialization(Module &) override; }; } // namespace llvm #endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H