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 DILocalVariable; 21 class DILocation; 22 class TargetRegisterInfo; 23 24 // For each user variable, keep a list of instruction ranges where this variable 25 // is accessible. The variables are listed in order of appearance. 26 class DbgValueHistoryMap { 27 // Each instruction range starts with a DBG_VALUE instruction, specifying the 28 // location of a variable, which is assumed to be valid until the end of the 29 // range. If end is not specified, location is valid until the start 30 // instruction of the next instruction range, or until the end of the 31 // function. 32 public: 33 typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange; 34 typedef SmallVector<InstrRange, 4> InstrRanges; 35 typedef std::pair<const DILocalVariable *, const DILocation *> 36 InlinedVariable; 37 typedef MapVector<InlinedVariable, InstrRanges> InstrRangesMap; 38 39 private: 40 InstrRangesMap VarInstrRanges; 41 42 public: 43 void startInstrRange(InlinedVariable Var, const MachineInstr &MI); 44 void endInstrRange(InlinedVariable Var, const MachineInstr &MI); 45 // Returns register currently describing @Var. If @Var is currently 46 // unaccessible or is not described by a register, returns 0. 47 unsigned getRegisterForVar(InlinedVariable Var) const; 48 49 bool empty() const { return VarInstrRanges.empty(); } 50 void clear() { VarInstrRanges.clear(); } 51 InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); } 52 InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); } 53 }; 54 55 void calculateDbgValueHistory(const MachineFunction *MF, 56 const TargetRegisterInfo *TRI, 57 DbgValueHistoryMap &Result); 58 } 59 60 #endif 61
