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 CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_ 11 #define 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 typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange; 32 typedef SmallVector<InstrRange, 4> InstrRanges; 33 typedef MapVector<const MDNode *, InstrRanges> InstrRangesMap; 34 InstrRangesMap VarInstrRanges; 35 36 public: 37 void startInstrRange(const MDNode *Var, const MachineInstr &MI); 38 void endInstrRange(const MDNode *Var, const MachineInstr &MI); 39 // Returns register currently describing @Var. If @Var is currently 40 // unaccessible or is not described by a register, returns 0. 41 unsigned getRegisterForVar(const MDNode *Var) const; 42 43 bool empty() const { return VarInstrRanges.empty(); } 44 void clear() { VarInstrRanges.clear(); } 45 InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); } 46 InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); } 47 }; 48 49 void calculateDbgValueHistory(const MachineFunction *MF, 50 const TargetRegisterInfo *TRI, 51 DbgValueHistoryMap &Result); 52 } 53 54 #endif 55
