vendor/clang/clang-r126079

1 files changed, 378 insertions, 0 deletions

diff --git a/lib/StaticAnalyzer/Core/SVals.cpp b/lib/StaticAnalyzer/Core/SVals.cpp
new file mode 100644
index 000000000000..4614e349dece
--- /dev/null
+++ b/lib/StaticAnalyzer/Core/SVals.cpp
@@ -0,0 +1,378 @@
+//= RValues.cpp - Abstract RValues for Path-Sens. Value Tracking -*- 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 SVal, Loc, and NonLoc, classes that represent
+//  abstract r-values for use with path-sensitive value tracking.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/StaticAnalyzer/Core/PathSensitive/GRState.h"
+#include "clang/AST/ExprObjC.h"
+#include "clang/Basic/IdentifierTable.h"
+
+using namespace clang;
+using namespace ento;
+using llvm::dyn_cast;
+using llvm::cast;
+using llvm::APSInt;
+
+//===----------------------------------------------------------------------===//
+// Symbol iteration within an SVal.
+//===----------------------------------------------------------------------===//
+
+
+//===----------------------------------------------------------------------===//
+// Utility methods.
+//===----------------------------------------------------------------------===//
+
+bool SVal::hasConjuredSymbol() const {
+  if (const nonloc::SymbolVal* SV = dyn_cast<nonloc::SymbolVal>(this)) {
+    SymbolRef sym = SV->getSymbol();
+    if (isa<SymbolConjured>(sym))
+      return true;
+  }
+
+  if (const loc::MemRegionVal *RV = dyn_cast<loc::MemRegionVal>(this)) {
+    const MemRegion *R = RV->getRegion();
+    if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(R)) {
+      SymbolRef sym = SR->getSymbol();
+      if (isa<SymbolConjured>(sym))
+        return true;
+    }
+  }
+
+  return false;
+}
+
+const FunctionDecl *SVal::getAsFunctionDecl() const {
+  if (const loc::MemRegionVal* X = dyn_cast<loc::MemRegionVal>(this)) {
+    const MemRegion* R = X->getRegion();
+    if (const FunctionTextRegion *CTR = R->getAs<FunctionTextRegion>())
+      return CTR->getDecl();
+  }
+
+  return NULL;
+}
+
+/// getAsLocSymbol - If this SVal is a location (subclasses Loc) and
+///  wraps a symbol, return that SymbolRef.  Otherwise return 0.
+// FIXME: should we consider SymbolRef wrapped in CodeTextRegion?
+SymbolRef SVal::getAsLocSymbol() const {
+  if (const nonloc::LocAsInteger *X = dyn_cast<nonloc::LocAsInteger>(this))
+    return X->getLoc().getAsLocSymbol();
+
+  if (const loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(this)) {
+    const MemRegion *R = X->stripCasts();
+    if (const SymbolicRegion *SymR = dyn_cast<SymbolicRegion>(R))
+      return SymR->getSymbol();
+  }
+  return NULL;
+}
+
+/// Get the symbol in the SVal or its base region.
+SymbolRef SVal::getLocSymbolInBase() const {
+  const loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(this);
+
+  if (!X)
+    return 0;
+
+  const MemRegion *R = X->getRegion();
+
+  while (const SubRegion *SR = dyn_cast<SubRegion>(R)) {
+    if (const SymbolicRegion *SymR = dyn_cast<SymbolicRegion>(SR))
+      return SymR->getSymbol();
+    else
+      R = SR->getSuperRegion();
+  }
+
+  return 0;
+}
+
+/// getAsSymbol - If this Sval wraps a symbol return that SymbolRef.
+///  Otherwise return 0.
+// FIXME: should we consider SymbolRef wrapped in CodeTextRegion?
+SymbolRef SVal::getAsSymbol() const {
+  if (const nonloc::SymbolVal *X = dyn_cast<nonloc::SymbolVal>(this))
+    return X->getSymbol();
+
+  if (const nonloc::SymExprVal *X = dyn_cast<nonloc::SymExprVal>(this))
+    if (SymbolRef Y = dyn_cast<SymbolData>(X->getSymbolicExpression()))
+      return Y;
+
+  return getAsLocSymbol();
+}
+
+/// getAsSymbolicExpression - If this Sval wraps a symbolic expression then
+///  return that expression.  Otherwise return NULL.
+const SymExpr *SVal::getAsSymbolicExpression() const {
+  if (const nonloc::SymExprVal *X = dyn_cast<nonloc::SymExprVal>(this))
+    return X->getSymbolicExpression();
+
+  return getAsSymbol();
+}
+
+const MemRegion *SVal::getAsRegion() const {
+  if (const loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(this))
+    return X->getRegion();
+
+  if (const nonloc::LocAsInteger *X = dyn_cast<nonloc::LocAsInteger>(this)) {
+    return X->getLoc().getAsRegion();
+  }
+
+  return 0;
+}
+
+const MemRegion *loc::MemRegionVal::stripCasts() const {
+  const MemRegion *R = getRegion();
+  return R ?  R->StripCasts() : NULL;
+}
+
+bool SVal::symbol_iterator::operator==(const symbol_iterator &X) const {
+  return itr == X.itr;
+}
+
+bool SVal::symbol_iterator::operator!=(const symbol_iterator &X) const {
+  return itr != X.itr;
+}
+
+SVal::symbol_iterator::symbol_iterator(const SymExpr *SE) {
+  itr.push_back(SE);
+  while (!isa<SymbolData>(itr.back())) expand();
+}
+
+SVal::symbol_iterator& SVal::symbol_iterator::operator++() {
+  assert(!itr.empty() && "attempting to iterate on an 'end' iterator");
+  assert(isa<SymbolData>(itr.back()));
+  itr.pop_back();
+  if (!itr.empty())
+    while (!isa<SymbolData>(itr.back())) expand();
+  return *this;
+}
+
+SymbolRef SVal::symbol_iterator::operator*() {
+  assert(!itr.empty() && "attempting to dereference an 'end' iterator");
+  return cast<SymbolData>(itr.back());
+}
+
+void SVal::symbol_iterator::expand() {
+  const SymExpr *SE = itr.back();
+  itr.pop_back();
+
+  if (const SymIntExpr *SIE = dyn_cast<SymIntExpr>(SE)) {
+    itr.push_back(SIE->getLHS());
+    return;
+  }
+  else if (const SymSymExpr *SSE = dyn_cast<SymSymExpr>(SE)) {
+    itr.push_back(SSE->getLHS());
+    itr.push_back(SSE->getRHS());
+    return;
+  }
+
+  assert(false && "unhandled expansion case");
+}
+
+const void *nonloc::LazyCompoundVal::getStore() const {
+  return static_cast<const LazyCompoundValData*>(Data)->getStore();
+}
+
+const TypedRegion *nonloc::LazyCompoundVal::getRegion() const {
+  return static_cast<const LazyCompoundValData*>(Data)->getRegion();
+}
+
+//===----------------------------------------------------------------------===//
+// Other Iterators.
+//===----------------------------------------------------------------------===//
+
+nonloc::CompoundVal::iterator nonloc::CompoundVal::begin() const {
+  return getValue()->begin();
+}
+
+nonloc::CompoundVal::iterator nonloc::CompoundVal::end() const {
+  return getValue()->end();
+}
+
+//===----------------------------------------------------------------------===//
+// Useful predicates.
+//===----------------------------------------------------------------------===//
+
+bool SVal::isConstant() const {
+  return isa<nonloc::ConcreteInt>(this) || isa<loc::ConcreteInt>(this);
+}
+
+bool SVal::isConstant(int I) const {
+  if (isa<loc::ConcreteInt>(*this))
+    return cast<loc::ConcreteInt>(*this).getValue() == I;
+  else if (isa<nonloc::ConcreteInt>(*this))
+    return cast<nonloc::ConcreteInt>(*this).getValue() == I;
+  else
+    return false;
+}
+
+bool SVal::isZeroConstant() const {
+  return isConstant(0);
+}
+
+
+//===----------------------------------------------------------------------===//
+// Transfer function dispatch for Non-Locs.
+//===----------------------------------------------------------------------===//
+
+SVal nonloc::ConcreteInt::evalBinOp(SValBuilder &svalBuilder,
+                                    BinaryOperator::Opcode Op,
+                                    const nonloc::ConcreteInt& R) const {
+  const llvm::APSInt* X =
+    svalBuilder.getBasicValueFactory().evalAPSInt(Op, getValue(), R.getValue());
+
+  if (X)
+    return nonloc::ConcreteInt(*X);
+  else
+    return UndefinedVal();
+}
+
+nonloc::ConcreteInt
+nonloc::ConcreteInt::evalComplement(SValBuilder &svalBuilder) const {
+  return svalBuilder.makeIntVal(~getValue());
+}
+
+nonloc::ConcreteInt
+nonloc::ConcreteInt::evalMinus(SValBuilder &svalBuilder) const {
+  return svalBuilder.makeIntVal(-getValue());
+}
+
+//===----------------------------------------------------------------------===//
+// Transfer function dispatch for Locs.
+//===----------------------------------------------------------------------===//
+
+SVal loc::ConcreteInt::evalBinOp(BasicValueFactory& BasicVals,
+                                 BinaryOperator::Opcode Op,
+                                 const loc::ConcreteInt& R) const {
+
+  assert (Op == BO_Add || Op == BO_Sub ||
+          (Op >= BO_LT && Op <= BO_NE));
+
+  const llvm::APSInt* X = BasicVals.evalAPSInt(Op, getValue(), R.getValue());
+
+  if (X)
+    return loc::ConcreteInt(*X);
+  else
+    return UndefinedVal();
+}
+
+//===----------------------------------------------------------------------===//
+// Pretty-Printing.
+//===----------------------------------------------------------------------===//
+
+void SVal::dump() const { dumpToStream(llvm::errs()); }
+
+void SVal::dumpToStream(llvm::raw_ostream& os) const {
+  switch (getBaseKind()) {
+    case UnknownKind:
+      os << "Unknown";
+      break;
+    case NonLocKind:
+      cast<NonLoc>(this)->dumpToStream(os);
+      break;
+    case LocKind:
+      cast<Loc>(this)->dumpToStream(os);
+      break;
+    case UndefinedKind:
+      os << "Undefined";
+      break;
+    default:
+      assert (false && "Invalid SVal.");
+  }
+}
+
+void NonLoc::dumpToStream(llvm::raw_ostream& os) const {
+  switch (getSubKind()) {
+    case nonloc::ConcreteIntKind: {
+      const nonloc::ConcreteInt& C = *cast<nonloc::ConcreteInt>(this);
+      if (C.getValue().isUnsigned())
+        os << C.getValue().getZExtValue();
+      else
+        os << C.getValue().getSExtValue();
+      os << ' ' << (C.getValue().isUnsigned() ? 'U' : 'S')
+         << C.getValue().getBitWidth() << 'b';
+      break;
+    }
+    case nonloc::SymbolValKind:
+      os << '$' << cast<nonloc::SymbolVal>(this)->getSymbol();
+      break;
+    case nonloc::SymExprValKind: {
+      const nonloc::SymExprVal& C = *cast<nonloc::SymExprVal>(this);
+      const SymExpr *SE = C.getSymbolicExpression();
+      os << SE;
+      break;
+    }
+    case nonloc::LocAsIntegerKind: {
+      const nonloc::LocAsInteger& C = *cast<nonloc::LocAsInteger>(this);
+      os << C.getLoc() << " [as " << C.getNumBits() << " bit integer]";
+      break;
+    }
+    case nonloc::CompoundValKind: {
+      const nonloc::CompoundVal& C = *cast<nonloc::CompoundVal>(this);
+      os << "compoundVal{";
+      bool first = true;
+      for (nonloc::CompoundVal::iterator I=C.begin(), E=C.end(); I!=E; ++I) {
+        if (first) {
+          os << ' '; first = false;
+        }
+        else
+          os << ", ";
+
+        (*I).dumpToStream(os);
+      }
+      os << "}";
+      break;
+    }
+    case nonloc::LazyCompoundValKind: {
+      const nonloc::LazyCompoundVal &C = *cast<nonloc::LazyCompoundVal>(this);
+      os << "lazyCompoundVal{" << const_cast<void *>(C.getStore())
+         << ',' << C.getRegion()
+         << '}';
+      break;
+    }
+    default:
+      assert (false && "Pretty-printed not implemented for this NonLoc.");
+      break;
+  }
+}
+
+void Loc::dumpToStream(llvm::raw_ostream& os) const {
+  switch (getSubKind()) {
+    case loc::ConcreteIntKind:
+      os << cast<loc::ConcreteInt>(this)->getValue().getZExtValue() << " (Loc)";
+      break;
+    case loc::GotoLabelKind:
+      os << "&&" << cast<loc::GotoLabel>(this)->getLabel()->getName();
+      break;
+    case loc::MemRegionKind:
+      os << '&' << cast<loc::MemRegionVal>(this)->getRegion()->getString();
+      break;
+    case loc::ObjCPropRefKind: {
+      const ObjCPropertyRefExpr *E = cast<loc::ObjCPropRef>(this)->getPropRefExpr();
+      os << "objc-prop{";
+      if (E->isSuperReceiver())
+        os << "super.";
+      else if (E->getBase())
+        os << "<base>.";
+
+      if (E->isImplicitProperty())
+        os << E->getImplicitPropertyGetter()->getSelector().getAsString();
+      else
+        os << E->getExplicitProperty()->getName();
+
+      os << "}";
+      break;
+    }
+    default:
+      assert(false && "Pretty-printing not implemented for this Loc.");
+      break;
+  }
+}