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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;
void SymExpr::dump() const {
dumpToStream(llvm::errs());
}
static void print(llvm::raw_ostream& os, BinaryOperator::Opcode Op) {
switch (Op) {
default:
assert(false && "operator printing not implemented");
break;
case BinaryOperator::Mul: os << '*' ; break;
case BinaryOperator::Div: os << '/' ; break;
case BinaryOperator::Rem: os << '%' ; break;
case BinaryOperator::Add: os << '+' ; break;
case BinaryOperator::Sub: os << '-' ; break;
case BinaryOperator::Shl: os << "<<" ; break;
case BinaryOperator::Shr: os << ">>" ; break;
case BinaryOperator::LT: os << "<" ; break;
case BinaryOperator::GT: os << '>' ; break;
case BinaryOperator::LE: os << "<=" ; break;
case BinaryOperator::GE: os << ">=" ; break;
case BinaryOperator::EQ: os << "==" ; break;
case BinaryOperator::NE: os << "!=" ; break;
case BinaryOperator::And: os << '&' ; break;
case BinaryOperator::Xor: os << '^' ; break;
case BinaryOperator::Or: os << '|' ; break;
}
}
void SymIntExpr::dumpToStream(llvm::raw_ostream& os) const {
os << '(';
getLHS()->dumpToStream(os);
os << ") ";
print(os, getOpcode());
os << ' ' << getRHS().getZExtValue();
if (getRHS().isUnsigned()) os << 'U';
}
void SymSymExpr::dumpToStream(llvm::raw_ostream& os) const {
os << '(';
getLHS()->dumpToStream(os);
os << ") ";
os << '(';
getRHS()->dumpToStream(os);
os << ')';
}
void SymbolConjured::dumpToStream(llvm::raw_ostream& os) const {
os << "conj_$" << getSymbolID() << '{' << T.getAsString() << '}';
}
void SymbolDerived::dumpToStream(llvm::raw_ostream& os) const {
os << "derived_$" << getSymbolID() << '{'
<< getParentSymbol() << ',' << getRegion() << '}';
}
void SymbolRegionValue::dumpToStream(llvm::raw_ostream& os) const {
os << "reg_$" << getSymbolID() << "<" << R << ">";
}
const SymbolRegionValue*
SymbolManager::getRegionValueSymbol(const MemRegion* R, QualType T) {
llvm::FoldingSetNodeID profile;
SymbolRegionValue::Profile(profile, R, T);
void* InsertPos;
SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos);
if (!SD) {
SD = (SymExpr*) BPAlloc.Allocate<SymbolRegionValue>();
new (SD) SymbolRegionValue(SymbolCounter, R, T);
DataSet.InsertNode(SD, InsertPos);
++SymbolCounter;
}
return cast<SymbolRegionValue>(SD);
}
const SymbolConjured*
SymbolManager::getConjuredSymbol(const Stmt* E, QualType T, unsigned Count,
const void* SymbolTag) {
llvm::FoldingSetNodeID profile;
SymbolConjured::Profile(profile, E, T, Count, SymbolTag);
void* InsertPos;
SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos);
if (!SD) {
SD = (SymExpr*) BPAlloc.Allocate<SymbolConjured>();
new (SD) SymbolConjured(SymbolCounter, E, T, Count, SymbolTag);
DataSet.InsertNode(SD, InsertPos);
++SymbolCounter;
}
return cast<SymbolConjured>(SD);
}
const SymbolDerived*
SymbolManager::getDerivedSymbol(SymbolRef parentSymbol,
const TypedRegion *R) {
llvm::FoldingSetNodeID profile;
SymbolDerived::Profile(profile, parentSymbol, R);
void* InsertPos;
SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos);
if (!SD) {
SD = (SymExpr*) BPAlloc.Allocate<SymbolDerived>();
new (SD) SymbolDerived(SymbolCounter, parentSymbol, R);
DataSet.InsertNode(SD, InsertPos);
++SymbolCounter;
}
return cast<SymbolDerived>(SD);
}
const SymIntExpr *SymbolManager::getSymIntExpr(const SymExpr *lhs,
BinaryOperator::Opcode op,
const llvm::APSInt& v,
QualType t) {
llvm::FoldingSetNodeID ID;
SymIntExpr::Profile(ID, lhs, op, v, t);
void *InsertPos;
SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos);
if (!data) {
data = (SymIntExpr*) BPAlloc.Allocate<SymIntExpr>();
new (data) SymIntExpr(lhs, op, v, t);
DataSet.InsertNode(data, InsertPos);
}
return cast<SymIntExpr>(data);
}
const SymSymExpr *SymbolManager::getSymSymExpr(const SymExpr *lhs,
BinaryOperator::Opcode op,
const SymExpr *rhs,
QualType t) {
llvm::FoldingSetNodeID ID;
SymSymExpr::Profile(ID, lhs, op, rhs, t);
void *InsertPos;
SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos);
if (!data) {
data = (SymSymExpr*) BPAlloc.Allocate<SymSymExpr>();
new (data) SymSymExpr(lhs, op, rhs, t);
DataSet.InsertNode(data, InsertPos);
}
return cast<SymSymExpr>(data);
}
QualType SymbolConjured::getType(ASTContext&) const {
return T;
}
QualType SymbolDerived::getType(ASTContext& Ctx) const {
return R->getValueType(Ctx);
}
QualType SymbolRegionValue::getType(ASTContext& C) const {
if (!T.isNull())
return T;
if (const TypedRegion* TR = dyn_cast<TypedRegion>(R))
return TR->getValueType(C);
return QualType();
}
SymbolManager::~SymbolManager() {}
bool SymbolManager::canSymbolicate(QualType T) {
return Loc::IsLocType(T) || (T->isIntegerType() && T->isScalarType());
}
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;
if (const SymbolDerived *derived = dyn_cast<SymbolDerived>(sym)) {
if (isLive(derived->getParentSymbol())) {
markLive(sym);
return true;
}
return false;
}
// Interogate the symbol. It may derive from an input value to
// the analyzed function/method.
return isa<SymbolRegionValue>(sym);
}
SymbolVisitor::~SymbolVisitor() {}
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