Chris Lattner has strong opinions about directory
layout. :)
Rename the 'EntoSA' directories to 'StaticAnalyzer'.
Internally we will still use the 'ento' namespace
for the analyzer engine (unless there are further
sabre rattlings...).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/MemRegion.cpp b/lib/StaticAnalyzer/MemRegion.cpp
new file mode 100644
index 0000000..e465224
--- /dev/null
+++ b/lib/StaticAnalyzer/MemRegion.cpp
@@ -0,0 +1,987 @@
+//== MemRegion.cpp - Abstract memory regions for static 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 MemRegion and its subclasses. MemRegion defines a
+// partially-typed abstraction of memory useful for path-sensitive dataflow
+// analyses.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/StaticAnalyzer/PathSensitive/MemRegion.h"
+#include "clang/StaticAnalyzer/PathSensitive/SValBuilder.h"
+#include "clang/Analysis/AnalysisContext.h"
+#include "clang/Analysis/Support/BumpVector.h"
+#include "clang/AST/CharUnits.h"
+#include "clang/AST/RecordLayout.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+using namespace ento;
+
+//===----------------------------------------------------------------------===//
+// MemRegion Construction.
+//===----------------------------------------------------------------------===//
+
+template<typename RegionTy> struct MemRegionManagerTrait;
+
+template <typename RegionTy, typename A1>
+RegionTy* MemRegionManager::getRegion(const A1 a1) {
+
+ const typename MemRegionManagerTrait<RegionTy>::SuperRegionTy *superRegion =
+ MemRegionManagerTrait<RegionTy>::getSuperRegion(*this, a1);
+
+ llvm::FoldingSetNodeID ID;
+ RegionTy::ProfileRegion(ID, a1, superRegion);
+ void* InsertPos;
+ RegionTy* R = cast_or_null<RegionTy>(Regions.FindNodeOrInsertPos(ID,
+ InsertPos));
+
+ if (!R) {
+ R = (RegionTy*) A.Allocate<RegionTy>();
+ new (R) RegionTy(a1, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
+
+template <typename RegionTy, typename A1>
+RegionTy* MemRegionManager::getSubRegion(const A1 a1,
+ const MemRegion *superRegion) {
+ llvm::FoldingSetNodeID ID;
+ RegionTy::ProfileRegion(ID, a1, superRegion);
+ void* InsertPos;
+ RegionTy* R = cast_or_null<RegionTy>(Regions.FindNodeOrInsertPos(ID,
+ InsertPos));
+
+ if (!R) {
+ R = (RegionTy*) A.Allocate<RegionTy>();
+ new (R) RegionTy(a1, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
+
+template <typename RegionTy, typename A1, typename A2>
+RegionTy* MemRegionManager::getRegion(const A1 a1, const A2 a2) {
+
+ const typename MemRegionManagerTrait<RegionTy>::SuperRegionTy *superRegion =
+ MemRegionManagerTrait<RegionTy>::getSuperRegion(*this, a1, a2);
+
+ llvm::FoldingSetNodeID ID;
+ RegionTy::ProfileRegion(ID, a1, a2, superRegion);
+ void* InsertPos;
+ RegionTy* R = cast_or_null<RegionTy>(Regions.FindNodeOrInsertPos(ID,
+ InsertPos));
+
+ if (!R) {
+ R = (RegionTy*) A.Allocate<RegionTy>();
+ new (R) RegionTy(a1, a2, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
+
+template <typename RegionTy, typename A1, typename A2>
+RegionTy* MemRegionManager::getSubRegion(const A1 a1, const A2 a2,
+ const MemRegion *superRegion) {
+
+ llvm::FoldingSetNodeID ID;
+ RegionTy::ProfileRegion(ID, a1, a2, superRegion);
+ void* InsertPos;
+ RegionTy* R = cast_or_null<RegionTy>(Regions.FindNodeOrInsertPos(ID,
+ InsertPos));
+
+ if (!R) {
+ R = (RegionTy*) A.Allocate<RegionTy>();
+ new (R) RegionTy(a1, a2, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
+
+template <typename RegionTy, typename A1, typename A2, typename A3>
+RegionTy* MemRegionManager::getSubRegion(const A1 a1, const A2 a2, const A3 a3,
+ const MemRegion *superRegion) {
+
+ llvm::FoldingSetNodeID ID;
+ RegionTy::ProfileRegion(ID, a1, a2, a3, superRegion);
+ void* InsertPos;
+ RegionTy* R = cast_or_null<RegionTy>(Regions.FindNodeOrInsertPos(ID,
+ InsertPos));
+
+ if (!R) {
+ R = (RegionTy*) A.Allocate<RegionTy>();
+ new (R) RegionTy(a1, a2, a3, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
+
+//===----------------------------------------------------------------------===//
+// Object destruction.
+//===----------------------------------------------------------------------===//
+
+MemRegion::~MemRegion() {}
+
+MemRegionManager::~MemRegionManager() {
+ // All regions and their data are BumpPtrAllocated. No need to call
+ // their destructors.
+}
+
+//===----------------------------------------------------------------------===//
+// Basic methods.
+//===----------------------------------------------------------------------===//
+
+bool SubRegion::isSubRegionOf(const MemRegion* R) const {
+ const MemRegion* r = getSuperRegion();
+ while (r != 0) {
+ if (r == R)
+ return true;
+ if (const SubRegion* sr = dyn_cast<SubRegion>(r))
+ r = sr->getSuperRegion();
+ else
+ break;
+ }
+ return false;
+}
+
+MemRegionManager* SubRegion::getMemRegionManager() const {
+ const SubRegion* r = this;
+ do {
+ const MemRegion *superRegion = r->getSuperRegion();
+ if (const SubRegion *sr = dyn_cast<SubRegion>(superRegion)) {
+ r = sr;
+ continue;
+ }
+ return superRegion->getMemRegionManager();
+ } while (1);
+}
+
+const StackFrameContext *VarRegion::getStackFrame() const {
+ const StackSpaceRegion *SSR = dyn_cast<StackSpaceRegion>(getMemorySpace());
+ return SSR ? SSR->getStackFrame() : NULL;
+}
+
+//===----------------------------------------------------------------------===//
+// Region extents.
+//===----------------------------------------------------------------------===//
+
+DefinedOrUnknownSVal DeclRegion::getExtent(SValBuilder &svalBuilder) const {
+ ASTContext& Ctx = svalBuilder.getContext();
+ QualType T = getDesugaredValueType(Ctx);
+
+ if (isa<VariableArrayType>(T))
+ return nonloc::SymbolVal(svalBuilder.getSymbolManager().getExtentSymbol(this));
+ if (isa<IncompleteArrayType>(T))
+ return UnknownVal();
+
+ CharUnits size = Ctx.getTypeSizeInChars(T);
+ QualType sizeTy = svalBuilder.getArrayIndexType();
+ return svalBuilder.makeIntVal(size.getQuantity(), sizeTy);
+}
+
+DefinedOrUnknownSVal FieldRegion::getExtent(SValBuilder &svalBuilder) const {
+ DefinedOrUnknownSVal Extent = DeclRegion::getExtent(svalBuilder);
+
+ // A zero-length array at the end of a struct often stands for dynamically-
+ // allocated extra memory.
+ if (Extent.isZeroConstant()) {
+ QualType T = getDesugaredValueType(svalBuilder.getContext());
+
+ if (isa<ConstantArrayType>(T))
+ return UnknownVal();
+ }
+
+ return Extent;
+}
+
+DefinedOrUnknownSVal AllocaRegion::getExtent(SValBuilder &svalBuilder) const {
+ return nonloc::SymbolVal(svalBuilder.getSymbolManager().getExtentSymbol(this));
+}
+
+DefinedOrUnknownSVal SymbolicRegion::getExtent(SValBuilder &svalBuilder) const {
+ return nonloc::SymbolVal(svalBuilder.getSymbolManager().getExtentSymbol(this));
+}
+
+DefinedOrUnknownSVal StringRegion::getExtent(SValBuilder &svalBuilder) const {
+ return svalBuilder.makeIntVal(getStringLiteral()->getByteLength()+1,
+ svalBuilder.getArrayIndexType());
+}
+
+QualType CXXBaseObjectRegion::getValueType() const {
+ return QualType(decl->getTypeForDecl(), 0);
+}
+
+//===----------------------------------------------------------------------===//
+// FoldingSet profiling.
+//===----------------------------------------------------------------------===//
+
+void MemSpaceRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ ID.AddInteger((unsigned)getKind());
+}
+
+void StackSpaceRegion::Profile(llvm::FoldingSetNodeID &ID) const {
+ ID.AddInteger((unsigned)getKind());
+ ID.AddPointer(getStackFrame());
+}
+
+void StaticGlobalSpaceRegion::Profile(llvm::FoldingSetNodeID &ID) const {
+ ID.AddInteger((unsigned)getKind());
+ ID.AddPointer(getCodeRegion());
+}
+
+void StringRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ const StringLiteral* Str,
+ const MemRegion* superRegion) {
+ ID.AddInteger((unsigned) StringRegionKind);
+ ID.AddPointer(Str);
+ ID.AddPointer(superRegion);
+}
+
+void AllocaRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ const Expr* Ex, unsigned cnt,
+ const MemRegion *) {
+ ID.AddInteger((unsigned) AllocaRegionKind);
+ ID.AddPointer(Ex);
+ ID.AddInteger(cnt);
+}
+
+void AllocaRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ ProfileRegion(ID, Ex, Cnt, superRegion);
+}
+
+void CompoundLiteralRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ CompoundLiteralRegion::ProfileRegion(ID, CL, superRegion);
+}
+
+void CompoundLiteralRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ const CompoundLiteralExpr* CL,
+ const MemRegion* superRegion) {
+ ID.AddInteger((unsigned) CompoundLiteralRegionKind);
+ ID.AddPointer(CL);
+ ID.AddPointer(superRegion);
+}
+
+void CXXThisRegion::ProfileRegion(llvm::FoldingSetNodeID &ID,
+ const PointerType *PT,
+ const MemRegion *sRegion) {
+ ID.AddInteger((unsigned) CXXThisRegionKind);
+ ID.AddPointer(PT);
+ ID.AddPointer(sRegion);
+}
+
+void CXXThisRegion::Profile(llvm::FoldingSetNodeID &ID) const {
+ CXXThisRegion::ProfileRegion(ID, ThisPointerTy, superRegion);
+}
+
+void DeclRegion::ProfileRegion(llvm::FoldingSetNodeID& ID, const Decl* D,
+ const MemRegion* superRegion, Kind k) {
+ ID.AddInteger((unsigned) k);
+ ID.AddPointer(D);
+ ID.AddPointer(superRegion);
+}
+
+void DeclRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ DeclRegion::ProfileRegion(ID, D, superRegion, getKind());
+}
+
+void VarRegion::Profile(llvm::FoldingSetNodeID &ID) const {
+ VarRegion::ProfileRegion(ID, getDecl(), superRegion);
+}
+
+void SymbolicRegion::ProfileRegion(llvm::FoldingSetNodeID& ID, SymbolRef sym,
+ const MemRegion *sreg) {
+ ID.AddInteger((unsigned) MemRegion::SymbolicRegionKind);
+ ID.Add(sym);
+ ID.AddPointer(sreg);
+}
+
+void SymbolicRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ SymbolicRegion::ProfileRegion(ID, sym, getSuperRegion());
+}
+
+void ElementRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ QualType ElementType, SVal Idx,
+ const MemRegion* superRegion) {
+ ID.AddInteger(MemRegion::ElementRegionKind);
+ ID.Add(ElementType);
+ ID.AddPointer(superRegion);
+ Idx.Profile(ID);
+}
+
+void ElementRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ ElementRegion::ProfileRegion(ID, ElementType, Index, superRegion);
+}
+
+void FunctionTextRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ const FunctionDecl *FD,
+ const MemRegion*) {
+ ID.AddInteger(MemRegion::FunctionTextRegionKind);
+ ID.AddPointer(FD);
+}
+
+void FunctionTextRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ FunctionTextRegion::ProfileRegion(ID, FD, superRegion);
+}
+
+void BlockTextRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ const BlockDecl *BD, CanQualType,
+ const AnalysisContext *AC,
+ const MemRegion*) {
+ ID.AddInteger(MemRegion::BlockTextRegionKind);
+ ID.AddPointer(BD);
+}
+
+void BlockTextRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ BlockTextRegion::ProfileRegion(ID, BD, locTy, AC, superRegion);
+}
+
+void BlockDataRegion::ProfileRegion(llvm::FoldingSetNodeID& ID,
+ const BlockTextRegion *BC,
+ const LocationContext *LC,
+ const MemRegion *sReg) {
+ ID.AddInteger(MemRegion::BlockDataRegionKind);
+ ID.AddPointer(BC);
+ ID.AddPointer(LC);
+ ID.AddPointer(sReg);
+}
+
+void BlockDataRegion::Profile(llvm::FoldingSetNodeID& ID) const {
+ BlockDataRegion::ProfileRegion(ID, BC, LC, getSuperRegion());
+}
+
+void CXXTempObjectRegion::ProfileRegion(llvm::FoldingSetNodeID &ID,
+ Expr const *Ex,
+ const MemRegion *sReg) {
+ ID.AddPointer(Ex);
+ ID.AddPointer(sReg);
+}
+
+void CXXTempObjectRegion::Profile(llvm::FoldingSetNodeID &ID) const {
+ ProfileRegion(ID, Ex, getSuperRegion());
+}
+
+void CXXBaseObjectRegion::ProfileRegion(llvm::FoldingSetNodeID &ID,
+ const CXXRecordDecl *decl,
+ const MemRegion *sReg) {
+ ID.AddPointer(decl);
+ ID.AddPointer(sReg);
+}
+
+void CXXBaseObjectRegion::Profile(llvm::FoldingSetNodeID &ID) const {
+ ProfileRegion(ID, decl, superRegion);
+}
+
+//===----------------------------------------------------------------------===//
+// Region pretty-printing.
+//===----------------------------------------------------------------------===//
+
+void MemRegion::dump() const {
+ dumpToStream(llvm::errs());
+}
+
+std::string MemRegion::getString() const {
+ std::string s;
+ llvm::raw_string_ostream os(s);
+ dumpToStream(os);
+ return os.str();
+}
+
+void MemRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "<Unknown Region>";
+}
+
+void AllocaRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "alloca{" << (void*) Ex << ',' << Cnt << '}';
+}
+
+void FunctionTextRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "code{" << getDecl()->getDeclName().getAsString() << '}';
+}
+
+void BlockTextRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "block_code{" << (void*) this << '}';
+}
+
+void BlockDataRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "block_data{" << BC << '}';
+}
+
+void CompoundLiteralRegion::dumpToStream(llvm::raw_ostream& os) const {
+ // FIXME: More elaborate pretty-printing.
+ os << "{ " << (void*) CL << " }";
+}
+
+void CXXTempObjectRegion::dumpToStream(llvm::raw_ostream &os) const {
+ os << "temp_object";
+}
+
+void CXXBaseObjectRegion::dumpToStream(llvm::raw_ostream &os) const {
+ os << "base " << decl->getName();
+}
+
+void CXXThisRegion::dumpToStream(llvm::raw_ostream &os) const {
+ os << "this";
+}
+
+void ElementRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "element{" << superRegion << ','
+ << Index << ',' << getElementType().getAsString() << '}';
+}
+
+void FieldRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << superRegion << "->" << getDecl();
+}
+
+void NonStaticGlobalSpaceRegion::dumpToStream(llvm::raw_ostream &os) const {
+ os << "NonStaticGlobalSpaceRegion";
+}
+
+void ObjCIvarRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "ivar{" << superRegion << ',' << getDecl() << '}';
+}
+
+void StringRegion::dumpToStream(llvm::raw_ostream& os) const {
+ Str->printPretty(os, 0, PrintingPolicy(getContext().getLangOptions()));
+}
+
+void SymbolicRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << "SymRegion{" << sym << '}';
+}
+
+void VarRegion::dumpToStream(llvm::raw_ostream& os) const {
+ os << cast<VarDecl>(D);
+}
+
+void RegionRawOffset::dump() const {
+ dumpToStream(llvm::errs());
+}
+
+void RegionRawOffset::dumpToStream(llvm::raw_ostream& os) const {
+ os << "raw_offset{" << getRegion() << ',' << getByteOffset() << '}';
+}
+
+void StaticGlobalSpaceRegion::dumpToStream(llvm::raw_ostream &os) const {
+ os << "StaticGlobalsMemSpace{" << CR << '}';
+}
+
+//===----------------------------------------------------------------------===//
+// MemRegionManager methods.
+//===----------------------------------------------------------------------===//
+
+template <typename REG>
+const REG *MemRegionManager::LazyAllocate(REG*& region) {
+ if (!region) {
+ region = (REG*) A.Allocate<REG>();
+ new (region) REG(this);
+ }
+
+ return region;
+}
+
+template <typename REG, typename ARG>
+const REG *MemRegionManager::LazyAllocate(REG*& region, ARG a) {
+ if (!region) {
+ region = (REG*) A.Allocate<REG>();
+ new (region) REG(this, a);
+ }
+
+ return region;
+}
+
+const StackLocalsSpaceRegion*
+MemRegionManager::getStackLocalsRegion(const StackFrameContext *STC) {
+ assert(STC);
+ StackLocalsSpaceRegion *&R = StackLocalsSpaceRegions[STC];
+
+ if (R)
+ return R;
+
+ R = A.Allocate<StackLocalsSpaceRegion>();
+ new (R) StackLocalsSpaceRegion(this, STC);
+ return R;
+}
+
+const StackArgumentsSpaceRegion *
+MemRegionManager::getStackArgumentsRegion(const StackFrameContext *STC) {
+ assert(STC);
+ StackArgumentsSpaceRegion *&R = StackArgumentsSpaceRegions[STC];
+
+ if (R)
+ return R;
+
+ R = A.Allocate<StackArgumentsSpaceRegion>();
+ new (R) StackArgumentsSpaceRegion(this, STC);
+ return R;
+}
+
+const GlobalsSpaceRegion
+*MemRegionManager::getGlobalsRegion(const CodeTextRegion *CR) {
+ if (!CR)
+ return LazyAllocate(globals);
+
+ StaticGlobalSpaceRegion *&R = StaticsGlobalSpaceRegions[CR];
+ if (R)
+ return R;
+
+ R = A.Allocate<StaticGlobalSpaceRegion>();
+ new (R) StaticGlobalSpaceRegion(this, CR);
+ return R;
+}
+
+const HeapSpaceRegion *MemRegionManager::getHeapRegion() {
+ return LazyAllocate(heap);
+}
+
+const MemSpaceRegion *MemRegionManager::getUnknownRegion() {
+ return LazyAllocate(unknown);
+}
+
+const MemSpaceRegion *MemRegionManager::getCodeRegion() {
+ return LazyAllocate(code);
+}
+
+//===----------------------------------------------------------------------===//
+// Constructing regions.
+//===----------------------------------------------------------------------===//
+
+const StringRegion* MemRegionManager::getStringRegion(const StringLiteral* Str){
+ return getSubRegion<StringRegion>(Str, getGlobalsRegion());
+}
+
+const VarRegion* MemRegionManager::getVarRegion(const VarDecl *D,
+ const LocationContext *LC) {
+ const MemRegion *sReg = 0;
+
+ if (D->hasGlobalStorage() && !D->isStaticLocal())
+ sReg = getGlobalsRegion();
+ else {
+ // FIXME: Once we implement scope handling, we will need to properly lookup
+ // 'D' to the proper LocationContext.
+ const DeclContext *DC = D->getDeclContext();
+ const StackFrameContext *STC = LC->getStackFrameForDeclContext(DC);
+
+ if (!STC)
+ sReg = getUnknownRegion();
+ else {
+ if (D->hasLocalStorage()) {
+ sReg = isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)
+ ? static_cast<const MemRegion*>(getStackArgumentsRegion(STC))
+ : static_cast<const MemRegion*>(getStackLocalsRegion(STC));
+ }
+ else {
+ assert(D->isStaticLocal());
+ const Decl *D = STC->getDecl();
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
+ sReg = getGlobalsRegion(getFunctionTextRegion(FD));
+ else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
+ const BlockTextRegion *BTR =
+ getBlockTextRegion(BD,
+ C.getCanonicalType(BD->getSignatureAsWritten()->getType()),
+ STC->getAnalysisContext());
+ sReg = getGlobalsRegion(BTR);
+ }
+ else {
+ // FIXME: For ObjC-methods, we need a new CodeTextRegion. For now
+ // just use the main global memspace.
+ sReg = getGlobalsRegion();
+ }
+ }
+ }
+ }
+
+ return getSubRegion<VarRegion>(D, sReg);
+}
+
+const VarRegion *MemRegionManager::getVarRegion(const VarDecl *D,
+ const MemRegion *superR) {
+ return getSubRegion<VarRegion>(D, superR);
+}
+
+const BlockDataRegion *
+MemRegionManager::getBlockDataRegion(const BlockTextRegion *BC,
+ const LocationContext *LC) {
+ const MemRegion *sReg = 0;
+
+ if (LC) {
+ // FIXME: Once we implement scope handling, we want the parent region
+ // to be the scope.
+ const StackFrameContext *STC = LC->getCurrentStackFrame();
+ assert(STC);
+ sReg = getStackLocalsRegion(STC);
+ }
+ else {
+ // We allow 'LC' to be NULL for cases where want BlockDataRegions
+ // without context-sensitivity.
+ sReg = getUnknownRegion();
+ }
+
+ return getSubRegion<BlockDataRegion>(BC, LC, sReg);
+}
+
+const CompoundLiteralRegion*
+MemRegionManager::getCompoundLiteralRegion(const CompoundLiteralExpr* CL,
+ const LocationContext *LC) {
+
+ const MemRegion *sReg = 0;
+
+ if (CL->isFileScope())
+ sReg = getGlobalsRegion();
+ else {
+ const StackFrameContext *STC = LC->getCurrentStackFrame();
+ assert(STC);
+ sReg = getStackLocalsRegion(STC);
+ }
+
+ return getSubRegion<CompoundLiteralRegion>(CL, sReg);
+}
+
+const ElementRegion*
+MemRegionManager::getElementRegion(QualType elementType, NonLoc Idx,
+ const MemRegion* superRegion,
+ ASTContext& Ctx){
+
+ QualType T = Ctx.getCanonicalType(elementType).getUnqualifiedType();
+
+ llvm::FoldingSetNodeID ID;
+ ElementRegion::ProfileRegion(ID, T, Idx, superRegion);
+
+ void* InsertPos;
+ MemRegion* data = Regions.FindNodeOrInsertPos(ID, InsertPos);
+ ElementRegion* R = cast_or_null<ElementRegion>(data);
+
+ if (!R) {
+ R = (ElementRegion*) A.Allocate<ElementRegion>();
+ new (R) ElementRegion(T, Idx, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
+
+const FunctionTextRegion *
+MemRegionManager::getFunctionTextRegion(const FunctionDecl *FD) {
+ return getSubRegion<FunctionTextRegion>(FD, getCodeRegion());
+}
+
+const BlockTextRegion *
+MemRegionManager::getBlockTextRegion(const BlockDecl *BD, CanQualType locTy,
+ AnalysisContext *AC) {
+ return getSubRegion<BlockTextRegion>(BD, locTy, AC, getCodeRegion());
+}
+
+
+/// getSymbolicRegion - Retrieve or create a "symbolic" memory region.
+const SymbolicRegion *MemRegionManager::getSymbolicRegion(SymbolRef sym) {
+ return getSubRegion<SymbolicRegion>(sym, getUnknownRegion());
+}
+
+const FieldRegion*
+MemRegionManager::getFieldRegion(const FieldDecl* d,
+ const MemRegion* superRegion){
+ return getSubRegion<FieldRegion>(d, superRegion);
+}
+
+const ObjCIvarRegion*
+MemRegionManager::getObjCIvarRegion(const ObjCIvarDecl* d,
+ const MemRegion* superRegion) {
+ return getSubRegion<ObjCIvarRegion>(d, superRegion);
+}
+
+const CXXTempObjectRegion*
+MemRegionManager::getCXXTempObjectRegion(Expr const *E,
+ LocationContext const *LC) {
+ const StackFrameContext *SFC = LC->getCurrentStackFrame();
+ assert(SFC);
+ return getSubRegion<CXXTempObjectRegion>(E, getStackLocalsRegion(SFC));
+}
+
+const CXXBaseObjectRegion *
+MemRegionManager::getCXXBaseObjectRegion(const CXXRecordDecl *decl,
+ const MemRegion *superRegion) {
+ return getSubRegion<CXXBaseObjectRegion>(decl, superRegion);
+}
+
+const CXXThisRegion*
+MemRegionManager::getCXXThisRegion(QualType thisPointerTy,
+ const LocationContext *LC) {
+ const StackFrameContext *STC = LC->getCurrentStackFrame();
+ assert(STC);
+ const PointerType *PT = thisPointerTy->getAs<PointerType>();
+ assert(PT);
+ return getSubRegion<CXXThisRegion>(PT, getStackArgumentsRegion(STC));
+}
+
+const AllocaRegion*
+MemRegionManager::getAllocaRegion(const Expr* E, unsigned cnt,
+ const LocationContext *LC) {
+ const StackFrameContext *STC = LC->getCurrentStackFrame();
+ assert(STC);
+ return getSubRegion<AllocaRegion>(E, cnt, getStackLocalsRegion(STC));
+}
+
+const MemSpaceRegion *MemRegion::getMemorySpace() const {
+ const MemRegion *R = this;
+ const SubRegion* SR = dyn_cast<SubRegion>(this);
+
+ while (SR) {
+ R = SR->getSuperRegion();
+ SR = dyn_cast<SubRegion>(R);
+ }
+
+ return dyn_cast<MemSpaceRegion>(R);
+}
+
+bool MemRegion::hasStackStorage() const {
+ return isa<StackSpaceRegion>(getMemorySpace());
+}
+
+bool MemRegion::hasStackNonParametersStorage() const {
+ return isa<StackLocalsSpaceRegion>(getMemorySpace());
+}
+
+bool MemRegion::hasStackParametersStorage() const {
+ return isa<StackArgumentsSpaceRegion>(getMemorySpace());
+}
+
+bool MemRegion::hasGlobalsOrParametersStorage() const {
+ const MemSpaceRegion *MS = getMemorySpace();
+ return isa<StackArgumentsSpaceRegion>(MS) ||
+ isa<GlobalsSpaceRegion>(MS);
+}
+
+// getBaseRegion strips away all elements and fields, and get the base region
+// of them.
+const MemRegion *MemRegion::getBaseRegion() const {
+ const MemRegion *R = this;
+ while (true) {
+ switch (R->getKind()) {
+ case MemRegion::ElementRegionKind:
+ case MemRegion::FieldRegionKind:
+ case MemRegion::ObjCIvarRegionKind:
+ R = cast<SubRegion>(R)->getSuperRegion();
+ continue;
+ default:
+ break;
+ }
+ break;
+ }
+ return R;
+}
+
+//===----------------------------------------------------------------------===//
+// View handling.
+//===----------------------------------------------------------------------===//
+
+const MemRegion *MemRegion::StripCasts() const {
+ const MemRegion *R = this;
+ while (true) {
+ if (const ElementRegion *ER = dyn_cast<ElementRegion>(R)) {
+ // FIXME: generalize. Essentially we want to strip away ElementRegions
+ // that were layered on a symbolic region because of casts. We only
+ // want to strip away ElementRegions, however, where the index is 0.
+ SVal index = ER->getIndex();
+ if (nonloc::ConcreteInt *CI = dyn_cast<nonloc::ConcreteInt>(&index)) {
+ if (CI->getValue().getSExtValue() == 0) {
+ R = ER->getSuperRegion();
+ continue;
+ }
+ }
+ }
+ break;
+ }
+ return R;
+}
+
+// FIXME: Merge with the implementation of the same method in Store.cpp
+static bool IsCompleteType(ASTContext &Ctx, QualType Ty) {
+ if (const RecordType *RT = Ty->getAs<RecordType>()) {
+ const RecordDecl *D = RT->getDecl();
+ if (!D->getDefinition())
+ return false;
+ }
+
+ return true;
+}
+
+RegionRawOffset ElementRegion::getAsArrayOffset() const {
+ CharUnits offset = CharUnits::Zero();
+ const ElementRegion *ER = this;
+ const MemRegion *superR = NULL;
+ ASTContext &C = getContext();
+
+ // FIXME: Handle multi-dimensional arrays.
+
+ while (ER) {
+ superR = ER->getSuperRegion();
+
+ // FIXME: generalize to symbolic offsets.
+ SVal index = ER->getIndex();
+ if (nonloc::ConcreteInt *CI = dyn_cast<nonloc::ConcreteInt>(&index)) {
+ // Update the offset.
+ int64_t i = CI->getValue().getSExtValue();
+
+ if (i != 0) {
+ QualType elemType = ER->getElementType();
+
+ // If we are pointing to an incomplete type, go no further.
+ if (!IsCompleteType(C, elemType)) {
+ superR = ER;
+ break;
+ }
+
+ CharUnits size = C.getTypeSizeInChars(elemType);
+ offset += (i * size);
+ }
+
+ // Go to the next ElementRegion (if any).
+ ER = dyn_cast<ElementRegion>(superR);
+ continue;
+ }
+
+ return NULL;
+ }
+
+ assert(superR && "super region cannot be NULL");
+ return RegionRawOffset(superR, offset.getQuantity());
+}
+
+RegionOffset MemRegion::getAsOffset() const {
+ const MemRegion *R = this;
+ int64_t Offset = 0;
+
+ while (1) {
+ switch (R->getKind()) {
+ default:
+ return RegionOffset(0);
+ case SymbolicRegionKind:
+ case AllocaRegionKind:
+ case CompoundLiteralRegionKind:
+ case CXXThisRegionKind:
+ case StringRegionKind:
+ case VarRegionKind:
+ case CXXTempObjectRegionKind:
+ goto Finish;
+ case ElementRegionKind: {
+ const ElementRegion *ER = cast<ElementRegion>(R);
+ QualType EleTy = ER->getValueType();
+
+ if (!IsCompleteType(getContext(), EleTy))
+ return RegionOffset(0);
+
+ SVal Index = ER->getIndex();
+ if (const nonloc::ConcreteInt *CI=dyn_cast<nonloc::ConcreteInt>(&Index)) {
+ int64_t i = CI->getValue().getSExtValue();
+ CharUnits Size = getContext().getTypeSizeInChars(EleTy);
+ Offset += i * Size.getQuantity() * 8;
+ } else {
+ // We cannot compute offset for non-concrete index.
+ return RegionOffset(0);
+ }
+ R = ER->getSuperRegion();
+ break;
+ }
+ case FieldRegionKind: {
+ const FieldRegion *FR = cast<FieldRegion>(R);
+ const RecordDecl *RD = FR->getDecl()->getParent();
+ if (!RD->isDefinition())
+ // We cannot compute offset for incomplete type.
+ return RegionOffset(0);
+ // Get the field number.
+ unsigned idx = 0;
+ for (RecordDecl::field_iterator FI = RD->field_begin(),
+ FE = RD->field_end(); FI != FE; ++FI, ++idx)
+ if (FR->getDecl() == *FI)
+ break;
+
+ const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+ // This is offset in bits.
+ Offset += Layout.getFieldOffset(idx);
+ R = FR->getSuperRegion();
+ break;
+ }
+ }
+ }
+
+ Finish:
+ return RegionOffset(R, Offset);
+}
+
+//===----------------------------------------------------------------------===//
+// BlockDataRegion
+//===----------------------------------------------------------------------===//
+
+void BlockDataRegion::LazyInitializeReferencedVars() {
+ if (ReferencedVars)
+ return;
+
+ AnalysisContext *AC = getCodeRegion()->getAnalysisContext();
+ AnalysisContext::referenced_decls_iterator I, E;
+ llvm::tie(I, E) = AC->getReferencedBlockVars(BC->getDecl());
+
+ if (I == E) {
+ ReferencedVars = (void*) 0x1;
+ return;
+ }
+
+ MemRegionManager &MemMgr = *getMemRegionManager();
+ llvm::BumpPtrAllocator &A = MemMgr.getAllocator();
+ BumpVectorContext BC(A);
+
+ typedef BumpVector<const MemRegion*> VarVec;
+ VarVec *BV = (VarVec*) A.Allocate<VarVec>();
+ new (BV) VarVec(BC, E - I);
+
+ for ( ; I != E; ++I) {
+ const VarDecl *VD = *I;
+ const VarRegion *VR = 0;
+
+ if (!VD->getAttr<BlocksAttr>() && VD->hasLocalStorage())
+ VR = MemMgr.getVarRegion(VD, this);
+ else {
+ if (LC)
+ VR = MemMgr.getVarRegion(VD, LC);
+ else {
+ VR = MemMgr.getVarRegion(VD, MemMgr.getUnknownRegion());
+ }
+ }
+
+ assert(VR);
+ BV->push_back(VR, BC);
+ }
+
+ ReferencedVars = BV;
+}
+
+BlockDataRegion::referenced_vars_iterator
+BlockDataRegion::referenced_vars_begin() const {
+ const_cast<BlockDataRegion*>(this)->LazyInitializeReferencedVars();
+
+ BumpVector<const MemRegion*> *Vec =
+ static_cast<BumpVector<const MemRegion*>*>(ReferencedVars);
+
+ return BlockDataRegion::referenced_vars_iterator(Vec == (void*) 0x1 ?
+ NULL : Vec->begin());
+}
+
+BlockDataRegion::referenced_vars_iterator
+BlockDataRegion::referenced_vars_end() const {
+ const_cast<BlockDataRegion*>(this)->LazyInitializeReferencedVars();
+
+ BumpVector<const MemRegion*> *Vec =
+ static_cast<BumpVector<const MemRegion*>*>(ReferencedVars);
+
+ return BlockDataRegion::referenced_vars_iterator(Vec == (void*) 0x1 ?
+ NULL : Vec->end());
+}