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//==- ProgramEdge.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 ProgramEdge, which identifies a distinct
// location in a function based on edges within its CFG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_PATHSENS_PROGRAM_POINT
#define LLVM_CLANG_ANALYSIS_PATHSENS_PROGRAM_POINT
#include "llvm/Support/DataTypes.h"
#include "llvm/ADT/DenseMap.h"
#include <cassert>
namespace clang {
class CFGBlock;
class Stmt;
class ProgramEdge {
uintptr_t Src, Dst;
public:
enum EdgeKind { BExprBlk=0, BlkBExpr=1, BExprBExpr=2, BlkBlk=3,
BExprSExpr=4, SExprSExpr=5, SExprBExpr=6, Infeasible=7 };
static bool classof(const ProgramEdge*) { return true; }
unsigned getKind() const { return (((unsigned) Src & 0x3) << 2) |
((unsigned) Dst & 0x3); }
void* RawSrc() const { return reinterpret_cast<void*>(Src & ~0x3); }
void* RawDst() const { return reinterpret_cast<void*>(Dst & ~0x3); }
bool operator==(const ProgramEdge & RHS) const {
// comparing pointer values canoncalizes "NULL" edges where both pointers
// are NULL without having to worry about edgekind. We can otherwise
// ignore edgekind because no CFGBlock* or Stmt* will have the same value.
return RawSrc() == RHS.RawSrc() && RawDst() == RHS.RawDst();
}
bool operator!=(const ProgramEdge& RHS) const {
return RawSrc() != RHS.RawSrc() || RawDst() != RHS.RawDst();
}
unsigned getHashValue() const {
uintptr_t v1 = reinterpret_cast<uintptr_t>(RawSrc());
uintptr_t v2 = reinterpret_cast<uintptr_t>(RawDst());
return static_cast<unsigned>( (v1 >> 4) ^ (v1 >> 9) ^
(v2 >> 5) ^ (v2 >> 10) );
}
protected:
ProgramEdge(const void* src, const void* dst, EdgeKind k) {
assert (k >= BExprBlk && k <= BlkBlk);
Src = reinterpret_cast<uintptr_t>(const_cast<void*>(src)) | (k >> 2);
Dst = reinterpret_cast<uintptr_t>(const_cast<void*>(dst)) | (k & 0x3);
}
};
class BExprBlkEdge : public ProgramEdge {
public:
BExprBlkEdge(const Stmt* S,const CFGBlock* B)
: ProgramEdge(S,B,BExprBlk) {}
Stmt* Src() const { return reinterpret_cast<Stmt*>(RawSrc()); }
CFGBlock* Dst() const { return reinterpret_cast<CFGBlock*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == BExprBlk;
}
};
class BlkBExprEdge : public ProgramEdge {
public:
BlkBExprEdge(const CFGBlock* B, const Stmt* S)
: ProgramEdge(B,S,BlkBExpr) {}
CFGBlock* Src() const { return reinterpret_cast<CFGBlock*>(RawSrc()); }
Stmt* Dst() const { return reinterpret_cast<Stmt*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == BlkBExpr;
}
};
class BExprBExprEdge : public ProgramEdge {
public:
BExprBExprEdge(const Stmt* S1, const Stmt* S2)
: ProgramEdge(S1,S2,BExprBExpr) {}
Stmt* Src() const { return reinterpret_cast<Stmt*>(RawSrc()); }
Stmt* Dst() const { return reinterpret_cast<Stmt*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == BExprBExpr;
}
};
class BExprSExprEdge : public ProgramEdge {
public:
BExprSExprEdge(const Stmt* S1, const Expr* S2)
: ProgramEdge(S1,S2,BExprSExpr) {}
Stmt* Src() const { return reinterpret_cast<Stmt*>(RawSrc()); }
Expr* Dst() const { return reinterpret_cast<Expr*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == BExprSExpr;
}
};
class SExprSExprEdge : public ProgramEdge {
public:
SExprSExprEdge(const Expr* S1, const Expr* S2)
: ProgramEdge(S1,S2,SExprSExpr) {}
Expr* Src() const { return reinterpret_cast<Expr*>(RawSrc()); }
Expr* Dst() const { return reinterpret_cast<Expr*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == SExprSExpr;
}
};
class SExprBExprEdge : public ProgramEdge {
public:
SExprBExprEdge(const Expr* S1, const Stmt* S2)
: ProgramEdge(S1,S2,SExprBExpr) {}
Expr* Src() const { return reinterpret_cast<Expr*>(RawSrc()); }
Stmt* Dst() const { return reinterpret_cast<Stmt*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == SExprBExpr;
}
};
class BlkBlkEdge : public ProgramEdge {
public:
BlkBlkEdge(const CFGBlock* B1, const CFGBlock* B2)
: ProgramEdge(B1,B2,BlkBlk) {}
CFGBlock* Src() const { return reinterpret_cast<CFGBlock*>(RawSrc()); }
CFGBlock* Dst() const { return reinterpret_cast<CFGBlock*>(RawDst()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == BlkBlk;
}
};
class InfeasibleEdge : public ProgramEdge {
public:
InfeasibleEdge(Stmt* S) : ProgramEdge(S,NULL,Infeasible) {}
Stmt* getStmt() const { return reinterpret_cast<Stmt*>(RawSrc()); }
static bool classof(const ProgramEdge* E) {
return E->getKind() == Infeasible;
}
};
} // end namespace clang
namespace llvm { // Traits specialization for DenseMap
template <> struct DenseMapInfo<clang::ProgramEdge> {
static inline clang::ProgramEdge getEmptyKey() {
return clang::BlkBlkEdge(0, 0);
}
static inline clang::ProgramEdge getTombstoneKey() {
return clang::BlkBlkEdge(reinterpret_cast<clang::CFGBlock*>(-1),
reinterpret_cast<clang::CFGBlock*>(-1));
}
static unsigned getHashValue(const clang::ProgramEdge& E) {
return E.getHashValue();
}
static bool isEqual(const clang::ProgramEdge& LHS,
const clang::ProgramEdge& RHS) {
return LHS == RHS;
}
static bool isPod() { return true; }
};
} // end namespace llvm
#endif
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