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Alexey Samsonov414b6fb2014-04-30 21:34:11 +00001//===-- 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
Alexey Samsonov0436caa2014-04-30 23:02:40 +000013#include "llvm/ADT/MapVector.h"
Alexey Samsonov414b6fb2014-04-30 21:34:11 +000014#include "llvm/ADT/SmallVector.h"
15
16namespace llvm {
17
18class MachineFunction;
19class MachineInstr;
20class MDNode;
21class TargetRegisterInfo;
22
Alexey Samsonovbb2990d2014-05-27 23:09:50 +000023// For each user variable, keep a list of instruction ranges where this variable
24// is accessible. The variables are listed in order of appearance.
25class 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
36public:
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};
Alexey Samsonov414b6fb2014-04-30 21:34:11 +000048
49void calculateDbgValueHistory(const MachineFunction *MF,
50 const TargetRegisterInfo *TRI,
51 DbgValueHistoryMap &Result);
52}
53
54#endif