1 //===-- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ----*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_
11 #define CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_
13 #include "llvm/ADT/MapVector.h"
14 #include "llvm/ADT/SmallVector.h"
18 class MachineFunction;
21 class TargetRegisterInfo;
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
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;
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;
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(); }
49 void calculateDbgValueHistory(const MachineFunction *MF,
50 const TargetRegisterInfo *TRI,
51 DbgValueHistoryMap &Result);