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//== SymbolManager.h - Management of Symbolic Values ------------*- 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 SymbolManager, a class that manages symbolic values
// created for use by GRExprEngine and related classes.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/SymbolManager.h"
#include "clang/Analysis/PathSensitive/MemRegion.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
llvm::raw_ostream& llvm::operator<<(llvm::raw_ostream& os,
clang::SymbolRef sym) {
if (sym.isValid())
os << sym.getNumber();
else
os << "(Invalid)";
return os;
}
std::ostream& std::operator<<(std::ostream& os, clang::SymbolRef sym) {
if (sym.isValid())
os << sym.getNumber();
else
os << "(Invalid)";
return os;
}
SymbolRef SymbolManager::getRegionRValueSymbol(const MemRegion* R) {
llvm::FoldingSetNodeID profile;
SymbolRegionRValue::Profile(profile, R);
void* InsertPos;
SymbolData* SD = DataSet.FindNodeOrInsertPos(profile, InsertPos);
if (SD) return SD->getSymbol();
SD = (SymbolData*) BPAlloc.Allocate<SymbolRegionRValue>();
new (SD) SymbolRegionRValue(SymbolCounter, R);
DataSet.InsertNode(SD, InsertPos);
DataMap[SymbolCounter] = SD;
return SymbolCounter++;
}
SymbolRef SymbolManager::getConjuredSymbol(const Stmt* E, QualType T,
unsigned Count,
const void* SymbolTag) {
llvm::FoldingSetNodeID profile;
SymbolConjured::Profile(profile, E, T, Count, SymbolTag);
void* InsertPos;
SymbolData* SD = DataSet.FindNodeOrInsertPos(profile, InsertPos);
if (SD)
return SD->getSymbol();
SD = (SymbolData*) BPAlloc.Allocate<SymbolConjured>();
new (SD) SymbolConjured(SymbolCounter, E, T, Count, SymbolTag);
DataSet.InsertNode(SD, InsertPos);
DataMap[SymbolCounter] = SD;
return SymbolCounter++;
}
SymbolRef SymbolManager::getSymIntExpr(SymbolRef lhs,BinaryOperator::Opcode op,
const llvm::APSInt& v, QualType t) {
llvm::FoldingSetNodeID ID;
SymIntExpr::Profile(ID, lhs, op, v, t);
void* InsertPos;
SymbolData* data = DataSet.FindNodeOrInsertPos(ID, InsertPos);
if (data)
return data->getSymbol();
data = (SymIntExpr*) BPAlloc.Allocate<SymIntExpr>();
new (data) SymIntExpr(SymbolCounter, lhs, op, v, t);
DataSet.InsertNode(data, InsertPos);
DataMap[SymbolCounter] = data;
return SymbolCounter++;
}
SymbolRef SymbolManager::getSymSymExpr(SymbolRef lhs, BinaryOperator::Opcode op,
SymbolRef rhs, QualType t) {
llvm::FoldingSetNodeID ID;
SymSymExpr::Profile(ID, lhs, op, rhs, t);
void* InsertPos;
SymbolData* data = DataSet.FindNodeOrInsertPos(ID, InsertPos);
if (data)
return data->getSymbol();
data = (SymSymExpr*) BPAlloc.Allocate<SymSymExpr>();
new (data) SymSymExpr(SymbolCounter, lhs, op, rhs, t);
DataSet.InsertNode(data, InsertPos);
DataMap[SymbolCounter] = data;
return SymbolCounter++;
}
const SymbolData& SymbolManager::getSymbolData(SymbolRef Sym) const {
DataMapTy::const_iterator I = DataMap.find(Sym);
assert (I != DataMap.end());
return *I->second;
}
QualType SymbolConjured::getType(ASTContext&) const {
return T;
}
QualType SymbolRegionRValue::getType(ASTContext& C) const {
if (const TypedRegion* TR = dyn_cast<TypedRegion>(R))
return TR->getRValueType(C);
return QualType();
}
SymbolManager::~SymbolManager() {}
bool SymbolManager::canSymbolicate(QualType T) {
return Loc::IsLocType(T) || T->isIntegerType();
}
void SymbolReaper::markLive(SymbolRef sym) {
TheLiving = F.Add(TheLiving, sym);
TheDead = F.Remove(TheDead, sym);
}
bool SymbolReaper::maybeDead(SymbolRef sym) {
if (isLive(sym))
return false;
TheDead = F.Add(TheDead, sym);
return true;
}
bool SymbolReaper::isLive(SymbolRef sym) {
if (TheLiving.contains(sym))
return true;
// Interogate the symbol. It may derive from an input value to
// the analyzed function/method.
return isa<SymbolRegionRValue>(SymMgr.getSymbolData(sym));
}
SymbolVisitor::~SymbolVisitor() {}
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