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 LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H
11 #define LLVM_LIB_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
32 typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange;
33 typedef SmallVector<InstrRange, 4> InstrRanges;
34 typedef MapVector<const MDNode *, InstrRanges> InstrRangesMap;
36 InstrRangesMap VarInstrRanges;
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;
45 bool empty() const { return VarInstrRanges.empty(); }
46 void clear() { VarInstrRanges.clear(); }
47 InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); }
48 InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); }
51 void calculateDbgValueHistory(const MachineFunction *MF,
52 const TargetRegisterInfo *TRI,
53 DbgValueHistoryMap &Result);