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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 "clang/AST/CFG.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include <cassert>
namespace clang {
class ProgramPoint {
public:
enum Kind { BlockEdgeKind=0, BlockEntranceKind, BlockExitKind,
// Keep the following four together and in this order.
PostStmtKind, PostLoadKind, PostStoreKind,
PostPurgeDeadSymbolsKind };
private:
std::pair<uintptr_t,uintptr_t> Data;
protected:
ProgramPoint(const void* P, Kind k)
: Data(reinterpret_cast<uintptr_t>(P), (uintptr_t) k) {}
ProgramPoint(const void* P1, const void* P2)
: Data(reinterpret_cast<uintptr_t>(P1) | 0x1,
reinterpret_cast<uintptr_t>(P2)) {}
protected:
void* getData1NoMask() const {
assert (getKind() != BlockEdgeKind);
return reinterpret_cast<void*>(Data.first);
}
void* getData1() const {
assert (getKind() == BlockEdgeKind);
return reinterpret_cast<void*>(Data.first & ~0x1);
}
void* getData2() const {
assert (getKind() == BlockEdgeKind);
return reinterpret_cast<void*>(Data.second);
}
public:
uintptr_t getKind() const {
return Data.first & 0x1 ? (uintptr_t) BlockEdgeKind : Data.second;
}
// For use with DenseMap.
unsigned getHashValue() const {
std::pair<void*,void*> P(reinterpret_cast<void*>(Data.first),
reinterpret_cast<void*>(Data.second));
return llvm::DenseMapInfo<std::pair<void*,void*> >::getHashValue(P);
}
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;
}
bool operator<(const ProgramPoint& RHS) const {
return Data < RHS.Data;
}
void Profile(llvm::FoldingSetNodeID& ID) const {
ID.AddPointer(reinterpret_cast<void*>(Data.first));
ID.AddPointer(reinterpret_cast<void*>(Data.second));
}
};
class BlockEntrance : public ProgramPoint {
public:
BlockEntrance(const CFGBlock* B) : ProgramPoint(B, BlockEntranceKind) {}
CFGBlock* getBlock() const {
return reinterpret_cast<CFGBlock*>(getData1NoMask());
}
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*>(getData1NoMask());
}
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 {
protected:
PostStmt(const Stmt* S, Kind k) : ProgramPoint(S, k) {}
public:
PostStmt(const Stmt* S) : ProgramPoint(S, PostStmtKind) {}
Stmt* getStmt() const { return (Stmt*) getData1NoMask(); }
static bool classof(const ProgramPoint* Location) {
unsigned k = Location->getKind();
return k >= PostStmtKind && k <= PostPurgeDeadSymbolsKind;
}
};
class PostLoad : public PostStmt {
public:
PostLoad(const Stmt* S) : PostStmt(S, PostLoadKind) {}
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == PostLoadKind;
}
};
class PostStore : public PostStmt {
public:
PostStore(const Stmt* S) : PostStmt(S, PostLoadKind) {}
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == PostStoreKind;
}
};
class PostPurgeDeadSymbols : public PostStmt {
public:
PostPurgeDeadSymbols(const Stmt* S) : PostStmt(S, PostPurgeDeadSymbolsKind) {}
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == PostPurgeDeadSymbolsKind;
}
};
class BlockEdge : public ProgramPoint {
public:
BlockEdge(const CFGBlock* B1, const CFGBlock* B2)
: ProgramPoint(B1, B2) {}
CFGBlock* getSrc() const {
return static_cast<CFGBlock*>(getData1());
}
CFGBlock* getDst() const {
return static_cast<CFGBlock*>(getData2());
}
static bool classof(const ProgramPoint* Location) {
return Location->getKind() == BlockEdgeKind;
}
};
} // 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 Loc.getHashValue();
}
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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