1 //===-- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ----*- C++ -*--===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H 11 #define LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H 12 13 #include "llvm/ADT/MapVector.h" 14 #include "llvm/ADT/SmallVector.h" 15 16 namespace llvm { 17 18 class MachineFunction; 19 class MachineInstr; 20 class MDNode; 21 class TargetRegisterInfo; 22 23 // For each user variable, keep a list of instruction ranges where this variable 24 // is accessible. The variables are listed in order of appearance. 25 class DbgValueHistoryMap { 26 // Each instruction range starts with a DBG_VALUE instruction, specifying the 27 // location of a variable, which is assumed to be valid until the end of the 28 // range. If end is not specified, location is valid until the start 29 // instruction of the next instruction range, or until the end of the 30 // function. 31 public: 32 typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange; 33 typedef SmallVector<InstrRange, 4> InstrRanges; 34 typedef MapVector<const MDNode *, InstrRanges> InstrRangesMap; 35 private: 36 InstrRangesMap VarInstrRanges; 37 38 public: 39 void startInstrRange(const MDNode *Var, const MachineInstr &MI); 40 void endInstrRange(const MDNode *Var, const MachineInstr &MI); 41 // Returns register currently describing @Var. If @Var is currently 42 // unaccessible or is not described by a register, returns 0. 43 unsigned getRegisterForVar(const MDNode *Var) const; 44 empty()45 bool empty() const { return VarInstrRanges.empty(); } clear()46 void clear() { VarInstrRanges.clear(); } begin()47 InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); } end()48 InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); } 49 }; 50 51 void calculateDbgValueHistory(const MachineFunction *MF, 52 const TargetRegisterInfo *TRI, 53 DbgValueHistoryMap &Result); 54 } 55 56 #endif 57