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//===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
#define CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
#include "llvm/IR/Constants.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/MC/MCSymbol.h"
namespace llvm {
class DwarfCompileUnit;
class MDNode;
/// \brief This struct describes location entries emitted in the .debug_loc
/// section.
class DebugLocEntry {
// Begin and end symbols for the address range that this location is valid.
const MCSymbol *Begin;
const MCSymbol *End;
// Type of entry that this represents.
enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
enum EntryType EntryKind;
union {
int64_t Int;
const ConstantFP *CFP;
const ConstantInt *CIP;
} Constants;
// The location in the machine frame.
MachineLocation Loc;
// The variable to which this location entry corresponds.
const MDNode *Variable;
// The compile unit to which this location entry is referenced by.
const DwarfCompileUnit *Unit;
bool hasSameValueOrLocation(const DebugLocEntry &Next) {
if (EntryKind != Next.EntryKind)
return false;
bool EqualValues;
switch (EntryKind) {
case E_Location:
EqualValues = Loc == Next.Loc;
break;
case E_Integer:
EqualValues = Constants.Int == Next.Constants.Int;
break;
case E_ConstantFP:
EqualValues = Constants.CFP == Next.Constants.CFP;
break;
case E_ConstantInt:
EqualValues = Constants.CIP == Next.Constants.CIP;
break;
}
return EqualValues;
}
public:
DebugLocEntry() : Begin(0), End(0), Variable(0), Unit(0) {
Constants.Int = 0;
}
DebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
const MDNode *V, const DwarfCompileUnit *U)
: Begin(B), End(E), Loc(L), Variable(V), Unit(U) {
Constants.Int = 0;
EntryKind = E_Location;
}
DebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i,
const DwarfCompileUnit *U)
: Begin(B), End(E), Variable(0), Unit(U) {
Constants.Int = i;
EntryKind = E_Integer;
}
DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr,
const DwarfCompileUnit *U)
: Begin(B), End(E), Variable(0), Unit(U) {
Constants.CFP = FPtr;
EntryKind = E_ConstantFP;
}
DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantInt *IPtr,
const DwarfCompileUnit *U)
: Begin(B), End(E), Variable(0), Unit(U) {
Constants.CIP = IPtr;
EntryKind = E_ConstantInt;
}
/// \brief Attempt to merge this DebugLocEntry with Next and return
/// true if the merge was successful. Entries can be merged if they
/// share the same Loc/Constant and if Next immediately follows this
/// Entry.
bool Merge(const DebugLocEntry &Next) {
if (End == Next.Begin && hasSameValueOrLocation(Next)) {
End = Next.End;
return true;
}
return false;
}
bool isLocation() const { return EntryKind == E_Location; }
bool isInt() const { return EntryKind == E_Integer; }
bool isConstantFP() const { return EntryKind == E_ConstantFP; }
bool isConstantInt() const { return EntryKind == E_ConstantInt; }
int64_t getInt() const { return Constants.Int; }
const ConstantFP *getConstantFP() const { return Constants.CFP; }
const ConstantInt *getConstantInt() const { return Constants.CIP; }
const MDNode *getVariable() const { return Variable; }
const MCSymbol *getBeginSym() const { return Begin; }
const MCSymbol *getEndSym() const { return End; }
const DwarfCompileUnit *getCU() const { return Unit; }
MachineLocation getLoc() const { return Loc; }
};
}
#endif
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