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//===---- llvm/CodeGen/DebugLoc.h - Debug Location Information --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a number of light weight data structures used by the code
// generator to describe and track debug location information.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_DEBUGLOC_H
#define LLVM_CODEGEN_DEBUGLOC_H
#include "llvm/ADT/DenseMap.h"
#include <vector>
namespace llvm {
class GlobalVariable;
class MachineFunction;
/// DebugScope - Debug scope id. This is carried into DebugLocTuple to index
/// into a vector of DebugScopeInfos. Provides the ability to associate a
/// SDNode/MachineInstr with the debug scope that it belongs to.
///
class DebugScope {
unsigned Idx;
public:
DebugScope() : Idx(~0U) {} // Defaults to null.
static DebugScope getInvalid() { DebugScope S; S.Idx = ~0U; return S; }
static DebugScope get(unsigned idx) { DebugScope S; S.Idx = idx; return S; }
unsigned getIndex() const { return Idx; }
/// isInvalid - Return true if it doesn't refer to any scope.
bool isInvalid() const { return Idx == ~0U; }
bool operator==(const DebugScope &DS) const { return Idx == DS.Idx; }
bool operator!=(const DebugScope &DS) const { return !(*this == DS); }
};
/// DebugScopeInfo - Contains info about the scope global variable and the
/// parent debug scope. DebugScope is only a "cookie" that can point to a
/// specific DebugScopeInfo.
///
struct DebugScopeInfo {
GlobalVariable *GV;
DebugScope Parent;
DebugScopeInfo(GlobalVariable *gv, DebugScope parent)
: GV(gv), Parent(parent) {}
DebugScopeInfo()
: GV(0), Parent(DebugScope::getInvalid()) {}
};
/// DebugScopeTracker - Create and keep track of the debug scope while
/// entering/exiting subprograms and blocks. Used by the instruction
/// selectors.
///
class DebugScopeTracker {
DebugScope CurScope;
public:
/// getCurScope - The current debug scope that we "entered" through
/// EnterDebugScope.
DebugScope getCurScope() const { return CurScope; }
/// EnterDebugScope - Start a new debug scope. ScopeGV can be a DISubprogram
/// or a DIBlock.
void EnterDebugScope(GlobalVariable *ScopeGV, MachineFunction &MF);
/// ExitDebugScope - "Pop" a DISubprogram or a DIBlock.
void ExitDebugScope(GlobalVariable *ScopeGV, MachineFunction &MF);
};
/// DebugLocTuple - Debug location tuple of a DICompileUnit global variable,
/// debug scope, line and column.
///
struct DebugLocTuple {
GlobalVariable *CompileUnit;
DebugScope Scope;
unsigned Line, Col;
DebugLocTuple(GlobalVariable *v, DebugScope s, unsigned l, unsigned c)
: CompileUnit(v), Scope(s), Line(l), Col(c) {};
bool operator==(const DebugLocTuple &DLT) const {
return CompileUnit == DLT.CompileUnit && Scope == DLT.Scope &&
Line == DLT.Line && Col == DLT.Col;
}
bool operator!=(const DebugLocTuple &DLT) const {
return !(*this == DLT);
}
};
/// DebugLoc - Debug location id. This is carried by SDNode and MachineInstr
/// to index into a vector of unique debug location tuples.
class DebugLoc {
unsigned Idx;
public:
DebugLoc() : Idx(~0U) {} // Defaults to invalid.
static DebugLoc getUnknownLoc() { DebugLoc L; L.Idx = ~0U; return L; }
static DebugLoc get(unsigned idx) { DebugLoc L; L.Idx = idx; return L; }
unsigned getIndex() const { return Idx; }
/// isUnknown - Return true if there is no debug info for the SDNode /
/// MachineInstr.
bool isUnknown() const { return Idx == ~0U; }
bool operator==(const DebugLoc &DL) const { return Idx == DL.Idx; }
bool operator!=(const DebugLoc &DL) const { return !(*this == DL); }
};
// Partially specialize DenseMapInfo for DebugLocTyple.
template<> struct DenseMapInfo<DebugLocTuple> {
static inline DebugLocTuple getEmptyKey() {
return DebugLocTuple(0, DebugScope::getInvalid(), ~0U, ~0U);
}
static inline DebugLocTuple getTombstoneKey() {
return DebugLocTuple((GlobalVariable*)~1U,DebugScope::get(~1U), ~1U, ~1U);
}
static unsigned getHashValue(const DebugLocTuple &Val) {
return DenseMapInfo<GlobalVariable*>::getHashValue(Val.CompileUnit) ^
DenseMapInfo<unsigned>::getHashValue(Val.Scope.getIndex()) ^
DenseMapInfo<unsigned>::getHashValue(Val.Line) ^
DenseMapInfo<unsigned>::getHashValue(Val.Col);
}
static bool isEqual(const DebugLocTuple &LHS, const DebugLocTuple &RHS) {
return LHS.CompileUnit == RHS.CompileUnit &&
LHS.Scope == RHS.Scope &&
LHS.Line == RHS.Line &&
LHS.Col == RHS.Col;
}
static bool isPod() { return true; }
};
/// DebugLocTracker - This class tracks debug location information.
///
struct DebugLocTracker {
/// DebugLocations - A vector of unique DebugLocTuple's.
///
std::vector<DebugLocTuple> DebugLocations;
/// DebugIdMap - This maps DebugLocTuple's to indices into the
/// DebugLocations vector.
DenseMap<DebugLocTuple, unsigned> DebugIdMap;
DebugLocTracker() {}
};
} // end namespace llvm
#endif /* LLVM_CODEGEN_DEBUGLOC_H */
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