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//== RegionStore.cpp - Field-sensitive store model --------------*- 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 a basic region store model. In this model, we do have field
// sensitivity. But we assume nothing about the heap shape. So recursive data
// structures are largely ignored. Basically we do 1-limiting analysis.
// Parameter pointers are assumed with no aliasing. Pointee objects of
// parameters are created lazily.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/MemRegion.h"
#include "clang/Analysis/PathSensitive/GRState.h"
#include "clang/Analysis/Analyses/LiveVariables.h"
#include "llvm/ADT/ImmutableMap.h"
#include "llvm/Support/Compiler.h"
using namespace clang;
typedef llvm::ImmutableMap<const MemRegion*, RVal> RegionBindingsTy;
namespace {
class VISIBILITY_HIDDEN RegionStoreManager : public StoreManager {
RegionBindingsTy::Factory RBFactory;
GRStateManager& StateMgr;
MemRegionManager MRMgr;
public:
RegionStoreManager(GRStateManager& mgr)
: StateMgr(mgr), MRMgr(StateMgr.getAllocator()) {}
virtual ~RegionStoreManager() {}
Store SetRVal(Store St, LVal LV, RVal V);
Store getInitialStore();
static inline RegionBindingsTy GetRegionBindings(Store store) {
return RegionBindingsTy(static_cast<const RegionBindingsTy::TreeTy*>(store));
}
};
} // end anonymous namespace
Store RegionStoreManager::SetRVal(Store store, LVal LV, RVal V) {
assert(LV.getSubKind() == lval::MemRegionKind);
MemRegion* R = cast<lval::MemRegionVal>(LV).getRegion();
if (!R)
return store;
RegionBindingsTy B = GetRegionBindings(store);
return V.isUnknown()
? RBFactory.Remove(B, R).getRoot()
: RBFactory.Add(B, R, V).getRoot();
}
Store RegionStoreManager::getInitialStore() {
typedef LiveVariables::AnalysisDataTy LVDataTy;
LVDataTy& D = StateMgr.getLiveVariables().getAnalysisData();
Store St = RBFactory.GetEmptyMap().getRoot();
for (LVDataTy::decl_iterator I=D.begin_decl(), E=D.end_decl(); I != E; ++I) {
ScopedDecl* SD = const_cast<ScopedDecl*>(I->first);
if (VarDecl* VD = dyn_cast<VarDecl>(SD)) {
// Punt on static variables for now.
if (VD->getStorageClass() == VarDecl::Static)
continue;
QualType T = VD->getType();
// Only handle pointers and integers for now.
if (LVal::IsLValType(T) || T->isIntegerType()) {
MemRegion* R = MRMgr.getVarRegion(VD);
// Initialize globals and parameters to symbolic values.
// Initialize local variables to undefined.
RVal X = (VD->hasGlobalStorage() || isa<ParmVarDecl>(VD) ||
isa<ImplicitParamDecl>(VD))
? RVal::GetSymbolValue(StateMgr.getSymbolManager(), VD)
: UndefinedVal();
St = SetRVal(St, lval::MemRegionVal(R), X);
}
}
}
return St;
}