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-rw-r--r--clang/lib/Analysis/BasicStore.cpp6
-rw-r--r--clang/lib/Analysis/GRExprEngine.cpp15
-rw-r--r--clang/lib/Analysis/MemRegion.cpp26
-rw-r--r--clang/lib/Analysis/RegionStore.cpp68
4 files changed, 113 insertions, 2 deletions
diff --git a/clang/lib/Analysis/BasicStore.cpp b/clang/lib/Analysis/BasicStore.cpp
index 4197c08a9cf..8b5ef6ee865 100644
--- a/clang/lib/Analysis/BasicStore.cpp
+++ b/clang/lib/Analysis/BasicStore.cpp
@@ -65,6 +65,12 @@ public:
/// ArrayToPointer - Used by GRExprEngine::VistCast to handle implicit
/// conversions between arrays and pointers.
SVal ArrayToPointer(SVal Array) { return Array; }
+
+ const GRState* CastRegion(const GRState* St, SVal VoidPtr, QualType CastToTy,
+ Stmt* CastE) {
+ return St;
+ }
+
/// getSelfRegion - Returns the region for the 'self' (Objective-C) or
/// 'this' object (C++). When used when analyzing a normal function this
diff --git a/clang/lib/Analysis/GRExprEngine.cpp b/clang/lib/Analysis/GRExprEngine.cpp
index 55fbf1874a5..e002c136372 100644
--- a/clang/lib/Analysis/GRExprEngine.cpp
+++ b/clang/lib/Analysis/GRExprEngine.cpp
@@ -1692,6 +1692,21 @@ void GRExprEngine::VisitCast(Expr* CastE, Expr* Ex, NodeTy* Pred, NodeSet& Dst){
continue;
}
+ // Check for casts from AllocaRegion pointer to typed pointer.
+ if (isa<loc::MemRegionVal>(V)) {
+ assert(Loc::IsLocType(T));
+ assert(Loc::IsLocType(ExTy));
+
+ // Delegate to store manager.
+ const GRState* NewSt = getStoreManager().CastRegion(St, V, T, CastE);
+
+ // If no new region is created, fall through to the default case.
+ if (NewSt != St) {
+ MakeNode(Dst, CastE, N, NewSt);
+ continue;
+ }
+ }
+
// All other cases.
MakeNode(Dst, CastE, N, BindExpr(St, CastE, EvalCast(V, CastE->getType())));
}
diff --git a/clang/lib/Analysis/MemRegion.cpp b/clang/lib/Analysis/MemRegion.cpp
index a292d98e605..4636eaef11f 100644
--- a/clang/lib/Analysis/MemRegion.cpp
+++ b/clang/lib/Analysis/MemRegion.cpp
@@ -44,6 +44,13 @@ void AllocaRegion::Profile(llvm::FoldingSetNodeID& ID) const {
ProfileRegion(ID, Ex, Cnt);
}
+void AnonTypedRegion::ProfileRegion(llvm::FoldingSetNodeID& ID, QualType T,
+ const MemRegion* superRegion) {
+ ID.AddInteger((unsigned) AnonTypedRegionKind);
+ ID.Add(T);
+ ID.AddPointer(superRegion);
+}
+
QualType AnonPointeeRegion::getType(ASTContext& C) const {
QualType T = C.getCanonicalType(Pointer->getType());
PointerType* PTy = cast<PointerType>(T.getTypePtr());
@@ -110,7 +117,7 @@ QualType ElementRegion::getType(ASTContext& C) const {
ArrayType* AT = cast<ArrayType>(T.getTypePtr());
return AT->getElementType();
}
- else if (isa<AllocaRegion>(superRegion)) {
+ else if (isa<AnonTypedRegion>(superRegion)) {
PointerType* PtrT = cast<PointerType>(T.getTypePtr());
QualType PTy = PtrT->getPointeeType();
return C.getCanonicalType(PTy);
@@ -369,6 +376,23 @@ MemRegionManager::getObjCObjectRegion(const ObjCInterfaceDecl* d,
return R;
}
+AnonTypedRegion*
+MemRegionManager::getAnonTypedRegion(QualType t, const MemRegion* superRegion) {
+ llvm::FoldingSetNodeID ID;
+ AnonTypedRegion::ProfileRegion(ID, t, superRegion);
+
+ void* InsertPos;
+ MemRegion* data = Regions.FindNodeOrInsertPos(ID, InsertPos);
+ AnonTypedRegion* R = cast_or_null<AnonTypedRegion>(data);
+
+ if (!R) {
+ R = (AnonTypedRegion*) A.Allocate<AnonTypedRegion>();
+ new (R) AnonTypedRegion(t, superRegion);
+ Regions.InsertNode(R, InsertPos);
+ }
+
+ return R;
+}
AnonPointeeRegion* MemRegionManager::getAnonPointeeRegion(const VarDecl* d) {
llvm::FoldingSetNodeID ID;
diff --git a/clang/lib/Analysis/RegionStore.cpp b/clang/lib/Analysis/RegionStore.cpp
index f1c57b33bdf..732785c0f72 100644
--- a/clang/lib/Analysis/RegionStore.cpp
+++ b/clang/lib/Analysis/RegionStore.cpp
@@ -16,26 +16,46 @@
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/MemRegion.h"
#include "clang/Analysis/PathSensitive/GRState.h"
+#include "clang/Analysis/PathSensitive/GRStateTrait.h"
#include "clang/Analysis/Analyses/LiveVariables.h"
#include "llvm/ADT/ImmutableMap.h"
+#include "llvm/ADT/ImmutableList.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Compiler.h"
using namespace clang;
typedef llvm::ImmutableMap<const MemRegion*, SVal> RegionBindingsTy;
+typedef llvm::ImmutableList<const MemRegion*> RegionViewTy;
+typedef llvm::ImmutableMap<const MemRegion*, RegionViewTy> RegionViewMapTy;
+
+static int RegionViewMapTyIndex = 0;
+
+namespace clang {
+template<> struct GRStateTrait<RegionViewMapTy>
+ : public GRStatePartialTrait<RegionViewMapTy> {
+ static void* GDMIndex() { return &RegionViewMapTyIndex; }
+};
+}
namespace {
class VISIBILITY_HIDDEN RegionStoreManager : public StoreManager {
RegionBindingsTy::Factory RBFactory;
+ RegionViewTy::Factory RVFactory;
+ RegionViewMapTy::Factory RVMFactory;
+
GRStateManager& StateMgr;
MemRegionManager MRMgr;
public:
RegionStoreManager(GRStateManager& mgr)
- : StateMgr(mgr), MRMgr(StateMgr.getAllocator()) {}
+ : RBFactory(mgr.getAllocator()),
+ RVFactory(mgr.getAllocator()),
+ RVMFactory(mgr.getAllocator()),
+ StateMgr(mgr),
+ MRMgr(StateMgr.getAllocator()) {}
virtual ~RegionStoreManager() {}
@@ -62,6 +82,9 @@ public:
SVal ArrayToPointer(SVal Array);
+ const GRState* CastRegion(const GRState* St, SVal VoidPtr,
+ QualType CastToTy, Stmt* CastE);
+
SVal Retrieve(Store S, Loc L, QualType T = QualType());
Store Bind(Store St, Loc LV, SVal V);
@@ -112,6 +135,9 @@ private:
// Utility methods.
BasicValueFactory& getBasicVals() { return StateMgr.getBasicVals(); }
ASTContext& getContext() { return StateMgr.getContext(); }
+
+ const GRState* AddRegionView(const GRState* St,
+ const MemRegion* View, const MemRegion* Base);
};
} // end anonymous namespace
@@ -238,6 +264,30 @@ SVal RegionStoreManager::ArrayToPointer(SVal Array) {
return loc::MemRegionVal(ER);
}
+const GRState* RegionStoreManager::CastRegion(const GRState* St,
+ SVal VoidPtr,
+ QualType CastToTy,
+ Stmt* CastE) {
+ if (const AllocaRegion* AR =
+ dyn_cast<AllocaRegion>(cast<loc::MemRegionVal>(VoidPtr).getRegion())) {
+
+ // Create a new region to attach type information to it.
+ const AnonTypedRegion* TR = MRMgr.getAnonTypedRegion(CastToTy, AR);
+
+ // Get the pointer to the first element.
+ nonloc::ConcreteInt Idx(getBasicVals().getZeroWithPtrWidth(false));
+ const ElementRegion* ER = MRMgr.getElementRegion(Idx, TR);
+
+ St = StateMgr.BindExpr(St, CastE, loc::MemRegionVal(ER));
+
+ // Add a RegionView to base region.
+ return AddRegionView(St, TR, AR);
+ }
+
+ // Default case.
+ return St;
+}
+
SVal RegionStoreManager::Retrieve(Store S, Loc L, QualType T) {
assert(!isa<UnknownVal>(L) && "location unknown");
assert(!isa<UndefinedVal>(L) && "location undefined");
@@ -600,3 +650,19 @@ Store RegionStoreManager::BindStructToVal(Store store, const TypedRegion* BaseR,
return store;
}
+
+const GRState* RegionStoreManager::AddRegionView(const GRState* St,
+ const MemRegion* View,
+ const MemRegion* Base) {
+ GRStateRef state(St, StateMgr);
+
+ // First, retrieve the region view of the base region.
+ RegionViewMapTy::data_type* d = state.get<RegionViewMapTy>(Base);
+ RegionViewTy L = d ? *d : RVFactory.GetEmptyList();
+
+ // Now add View to the region view.
+ L = RVFactory.Add(View, L);
+
+ // Create a new state with the new region view.
+ return state.set<RegionViewMapTy>(Base, L);
+}
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