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//==- ProgramPoint.h - Program Points for Path-Sensitive Analysis --*- 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 the interface ProgramPoint, which identifies a
// distinct location in a function.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_PROGRAM_POINT
#define LLVM_CLANG_ANALYSIS_PROGRAM_POINT
#include "llvm/Support/DataTypes.h"
#include "llvm/ADT/DenseMap.h"
#include <cassert>
namespace clang {
class CFG;
class CFGBlock;
class Stmt;
class ProgramPoint {
public:
enum Kind { BlockEntranceKind=0, PostStmtKind=1, BlockExitKind=2,
BlockEdgeSrcKind=3, BlockEdgeDstKind=4, BlockEdgeAuxKind=5 };
protected:
uintptr_t Data;
ProgramPoint(const void* Ptr, Kind k) {
assert ((reinterpret_cast<uintptr_t>(const_cast<void*>(Ptr)) & 0x7) == 0
&& "Address must have at least an 8-byte alignment.");
Data = reinterpret_cast<uintptr_t>(const_cast<void*>(Ptr)) & k;
}
ProgramPoint() : Data(0) {}
public:
unsigned getKind() const { return Data & 0x5; }
void* getRawPtr() const { return reinterpret_cast<void*>(Data & ~0x7); }
void* getRawData() const { return reinterpret_cast<void*>(Data); }
static bool classof(const ProgramPoint*) { return true; }
bool operator==(const ProgramPoint & RHS) const { return Data == RHS.Data; }
bool operator!=(const ProgramPoint& RHS) const { return Data != RHS.Data; }
};
class BlockEntrance : public ProgramPoint {
public:
BlockEntrance(const CFGBlock* B) : ProgramPoint(B, BlockEntranceKind) {}
CFGBlock* getBlock() const {
return reinterpret_cast<CFGBlock*>(getRawPtr());
}
Stmt* getFirstStmt() const {
CFGBlock* B = getBlock();
return B->empty() ? NULL : B->front();
}
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == BlockEntranceKind;
}
};
class BlockExit : public ProgramPoint {
public:
BlockExit(const CFGBlock* B) : ProgramPoint(B, BlockExitKind) {}
CFGBlock* getBlock() const {
return reinterpret_cast<CFGBlock*>(getRawPtr());
}
Stmt* getLastStmt() const {
CFGBlock* B = getBlock();
return B->empty() ? NULL : B->back();
}
Stmt* getTerminator() const {
return getBlock()->getTerminator();
}
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == BlockExitKind;
}
};
class PostStmt : public ProgramPoint {
public:
PostStmt(const Stmt* S) : ProgramPoint(S, PostStmtKind) {}
Stmt* getStmt() const { return (Stmt*) getRawPtr(); }
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == PostStmtKind;
}
};
class BlockEdge : public ProgramPoint {
typedef std::pair<CFGBlock*,CFGBlock*> BPair;
public:
BlockEdge(CFG& cfg, const CFGBlock* B1, const CFGBlock* B2);
CFGBlock* getSrc() const;
CFGBlock* getDst() const;
static bool classof(const ProgramPoint* Location) {
unsigned k = Location->getKind();
return k >= BlockEdgeSrcKind && k <= BlockEdgeAuxKind;
}
};
} // end namespace clang
namespace llvm { // Traits specialization for DenseMap
template <> struct DenseMapInfo<clang::ProgramPoint> {
static inline clang::ProgramPoint getEmptyKey() {
uintptr_t x =
reinterpret_cast<uintptr_t>(DenseMapInfo<void*>::getEmptyKey()) & ~0x7;
return clang::BlockEntrance(reinterpret_cast<clang::CFGBlock*>(x));
}
static inline clang::ProgramPoint getTombstoneKey() {
uintptr_t x =
reinterpret_cast<uintptr_t>(DenseMapInfo<void*>::getTombstoneKey()) & ~0x7;
return clang::BlockEntrance(reinterpret_cast<clang::CFGBlock*>(x));
}
static unsigned getHashValue(const clang::ProgramPoint& Loc) {
return DenseMapInfo<void*>::getHashValue(Loc.getRawData());
}
static bool isEqual(const clang::ProgramPoint& L,
const clang::ProgramPoint& R) {
return L == R;
}
static bool isPod() {
return true;
}
};
} // end namespace llvm
#endif
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