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llvm-project/clang/lib/Checker/MemRegion.cpp

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//== 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/Checker/PathSensitive/MemRegion.h"
#include "clang/Checker/PathSensitive/ValueManager.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;
//===----------------------------------------------------------------------===//
// 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(ValueManager& ValMgr) const {
ASTContext& Ctx = ValMgr.getContext();
QualType T = getDesugaredValueType();
if (isa<VariableArrayType>(T))
return nonloc::SymbolVal(ValMgr.getSymbolManager().getExtentSymbol(this));
if (isa<IncompleteArrayType>(T))
return UnknownVal();
CharUnits Size = Ctx.getTypeSizeInChars(T);
QualType SizeTy = Ctx.getSizeType();
return ValMgr.makeIntVal(Size.getQuantity(), SizeTy);
}
DefinedOrUnknownSVal FieldRegion::getExtent(ValueManager& ValMgr) const {
DefinedOrUnknownSVal Extent = DeclRegion::getExtent(ValMgr);
// A zero-length array at the end of a struct often stands for dynamically-
// allocated extra memory.
if (Extent.isZeroConstant()) {
QualType T = getDesugaredValueType();
if (isa<ConstantArrayType>(T))
return UnknownVal();
}
return Extent;
}
DefinedOrUnknownSVal AllocaRegion::getExtent(ValueManager& ValMgr) const {
return nonloc::SymbolVal(ValMgr.getSymbolManager().getExtentSymbol(this));
}
DefinedOrUnknownSVal SymbolicRegion::getExtent(ValueManager& ValMgr) const {
return nonloc::SymbolVal(ValMgr.getSymbolManager().getExtentSymbol(this));
}
DefinedOrUnknownSVal StringRegion::getExtent(ValueManager& ValMgr) const {
QualType SizeTy = ValMgr.getContext().getSizeType();
return ValMgr.makeIntVal(getStringLiteral()->getByteLength()+1, SizeTy);
}
//===----------------------------------------------------------------------===//
// 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 CXXObjectRegion::ProfileRegion(llvm::FoldingSetNodeID &ID,
Expr const *Ex,
const MemRegion *sReg) {
ID.AddPointer(Ex);
ID.AddPointer(sReg);
}
void CXXObjectRegion::Profile(llvm::FoldingSetNodeID &ID) const {
ProfileRegion(ID, Ex, getSuperRegion());
}
//===----------------------------------------------------------------------===//
// 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 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, SVal 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 CXXObjectRegion*
MemRegionManager::getCXXObjectRegion(Expr const *E,
LocationContext const *LC) {
const StackFrameContext *SFC = LC->getCurrentStackFrame();
assert(SFC);
return getSubRegion<CXXObjectRegion>(E, getStackLocalsRegion(SFC));
}
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 CXXObjectRegionKind:
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());
}
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