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//===-- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ----*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SmallVector.h"
namespace llvm {
class MachineFunction;
class MachineInstr;
class MDNode;
class TargetRegisterInfo;
// For each user variable, keep a list of instruction ranges where this variable
// is accessible. The variables are listed in order of appearance.
class DbgValueHistoryMap {
// Each instruction range starts with a DBG_VALUE instruction, specifying the
// location of a variable, which is assumed to be valid until the end of the
// range. If end is not specified, location is valid until the start
// instruction of the next instruction range, or until the end of the
// function.
public:
typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange;
typedef SmallVector<InstrRange, 4> InstrRanges;
typedef MapVector<const MDNode *, InstrRanges> InstrRangesMap;
private:
InstrRangesMap VarInstrRanges;
public:
void startInstrRange(const MDNode *Var, const MachineInstr &MI);
void endInstrRange(const MDNode *Var, const MachineInstr &MI);
// Returns register currently describing @Var. If @Var is currently
// unaccessible or is not described by a register, returns 0.
unsigned getRegisterForVar(const MDNode *Var) const;
bool empty() const { return VarInstrRanges.empty(); }
void clear() { VarInstrRanges.clear(); }
InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); }
InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); }
};
void calculateDbgValueHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &Result);
}
#endif
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