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;
20 class MDLocalVariable;
22 class TargetRegisterInfo;
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
33 typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange;
34 typedef SmallVector<InstrRange, 4> InstrRanges;
35 typedef std::pair<const MDLocalVariable *, const MDLocation *>
37 typedef MapVector<InlinedVariable, InstrRanges> InstrRangesMap;
40 InstrRangesMap VarInstrRanges;
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;
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(); }
55 void calculateDbgValueHistory(const MachineFunction *MF,
56 const TargetRegisterInfo *TRI,
57 DbgValueHistoryMap &Result);