forked from OSchip/llvm-project
725 lines
23 KiB
C++
725 lines
23 KiB
C++
//= ProgramState.cpp - Path-Sensitive "State" for tracking values --*- C++ -*--=
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements ProgramState and ProgramStateManager.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/CFG.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/SubEngine.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/TaintManager.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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using namespace ento;
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// Give the vtable for ConstraintManager somewhere to live.
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// FIXME: Move this elsewhere.
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ConstraintManager::~ConstraintManager() {}
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ProgramState::ProgramState(ProgramStateManager *mgr, const Environment& env,
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StoreRef st, GenericDataMap gdm)
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: stateMgr(mgr),
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Env(env),
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store(st.getStore()),
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GDM(gdm),
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refCount(0) {
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stateMgr->getStoreManager().incrementReferenceCount(store);
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}
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ProgramState::ProgramState(const ProgramState &RHS)
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: llvm::FoldingSetNode(),
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stateMgr(RHS.stateMgr),
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Env(RHS.Env),
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store(RHS.store),
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GDM(RHS.GDM),
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refCount(0) {
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stateMgr->getStoreManager().incrementReferenceCount(store);
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}
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ProgramState::~ProgramState() {
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if (store)
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stateMgr->getStoreManager().decrementReferenceCount(store);
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}
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ProgramStateManager::~ProgramStateManager() {
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for (GDMContextsTy::iterator I=GDMContexts.begin(), E=GDMContexts.end();
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I!=E; ++I)
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I->second.second(I->second.first);
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}
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const ProgramState*
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ProgramStateManager::removeDeadBindings(const ProgramState *state,
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const StackFrameContext *LCtx,
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SymbolReaper& SymReaper) {
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// This code essentially performs a "mark-and-sweep" of the VariableBindings.
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// The roots are any Block-level exprs and Decls that our liveness algorithm
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// tells us are live. We then see what Decls they may reference, and keep
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// those around. This code more than likely can be made faster, and the
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// frequency of which this method is called should be experimented with
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// for optimum performance.
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ProgramState NewState = *state;
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NewState.Env = EnvMgr.removeDeadBindings(NewState.Env, SymReaper, state);
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// Clean up the store.
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StoreRef newStore = StoreMgr->removeDeadBindings(NewState.getStore(), LCtx,
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SymReaper);
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NewState.setStore(newStore);
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SymReaper.setReapedStore(newStore);
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return getPersistentState(NewState);
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}
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const ProgramState *ProgramStateManager::MarshalState(const ProgramState *state,
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const StackFrameContext *InitLoc) {
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// make up an empty state for now.
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ProgramState State(this,
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EnvMgr.getInitialEnvironment(),
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StoreMgr->getInitialStore(InitLoc),
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GDMFactory.getEmptyMap());
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return getPersistentState(State);
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}
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const ProgramState *ProgramState::bindCompoundLiteral(const CompoundLiteralExpr *CL,
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const LocationContext *LC,
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SVal V) const {
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const StoreRef &newStore =
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getStateManager().StoreMgr->BindCompoundLiteral(getStore(), CL, LC, V);
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return makeWithStore(newStore);
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}
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const ProgramState *ProgramState::bindDecl(const VarRegion* VR, SVal IVal) const {
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const StoreRef &newStore =
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getStateManager().StoreMgr->BindDecl(getStore(), VR, IVal);
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return makeWithStore(newStore);
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}
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const ProgramState *ProgramState::bindDeclWithNoInit(const VarRegion* VR) const {
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const StoreRef &newStore =
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getStateManager().StoreMgr->BindDeclWithNoInit(getStore(), VR);
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return makeWithStore(newStore);
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}
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const ProgramState *ProgramState::bindLoc(Loc LV, SVal V) const {
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ProgramStateManager &Mgr = getStateManager();
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const ProgramState *newState = makeWithStore(Mgr.StoreMgr->Bind(getStore(),
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LV, V));
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const MemRegion *MR = LV.getAsRegion();
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if (MR && Mgr.getOwningEngine())
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return Mgr.getOwningEngine()->processRegionChange(newState, MR);
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return newState;
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}
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const ProgramState *ProgramState::bindDefault(SVal loc, SVal V) const {
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ProgramStateManager &Mgr = getStateManager();
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const MemRegion *R = cast<loc::MemRegionVal>(loc).getRegion();
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const StoreRef &newStore = Mgr.StoreMgr->BindDefault(getStore(), R, V);
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const ProgramState *new_state = makeWithStore(newStore);
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return Mgr.getOwningEngine() ?
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Mgr.getOwningEngine()->processRegionChange(new_state, R) :
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new_state;
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}
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const ProgramState *
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ProgramState::invalidateRegions(ArrayRef<const MemRegion *> Regions,
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const Expr *E, unsigned Count,
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StoreManager::InvalidatedSymbols *IS,
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bool invalidateGlobals) const {
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if (!IS) {
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StoreManager::InvalidatedSymbols invalidated;
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return invalidateRegionsImpl(Regions, E, Count,
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invalidated, invalidateGlobals);
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}
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return invalidateRegionsImpl(Regions, E, Count, *IS, invalidateGlobals);
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}
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const ProgramState *
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ProgramState::invalidateRegionsImpl(ArrayRef<const MemRegion *> Regions,
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const Expr *E, unsigned Count,
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StoreManager::InvalidatedSymbols &IS,
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bool invalidateGlobals) const {
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ProgramStateManager &Mgr = getStateManager();
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SubEngine* Eng = Mgr.getOwningEngine();
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if (Eng && Eng->wantsRegionChangeUpdate(this)) {
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StoreManager::InvalidatedRegions Invalidated;
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const StoreRef &newStore
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= Mgr.StoreMgr->invalidateRegions(getStore(), Regions, E, Count, IS,
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invalidateGlobals, &Invalidated);
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const ProgramState *newState = makeWithStore(newStore);
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return Eng->processRegionChanges(newState, &IS, Regions, Invalidated);
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}
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const StoreRef &newStore =
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Mgr.StoreMgr->invalidateRegions(getStore(), Regions, E, Count, IS,
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invalidateGlobals, NULL);
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return makeWithStore(newStore);
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}
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const ProgramState *ProgramState::unbindLoc(Loc LV) const {
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assert(!isa<loc::MemRegionVal>(LV) && "Use invalidateRegion instead.");
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Store OldStore = getStore();
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const StoreRef &newStore = getStateManager().StoreMgr->Remove(OldStore, LV);
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if (newStore.getStore() == OldStore)
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return this;
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return makeWithStore(newStore);
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}
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const ProgramState *ProgramState::enterStackFrame(const StackFrameContext *frame) const {
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const StoreRef &new_store =
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getStateManager().StoreMgr->enterStackFrame(this, frame);
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return makeWithStore(new_store);
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}
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SVal ProgramState::getSValAsScalarOrLoc(const MemRegion *R) const {
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// We only want to do fetches from regions that we can actually bind
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// values. For example, SymbolicRegions of type 'id<...>' cannot
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// have direct bindings (but their can be bindings on their subregions).
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if (!R->isBoundable())
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return UnknownVal();
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if (const TypedValueRegion *TR = dyn_cast<TypedValueRegion>(R)) {
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QualType T = TR->getValueType();
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if (Loc::isLocType(T) || T->isIntegerType())
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return getSVal(R);
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}
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return UnknownVal();
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}
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SVal ProgramState::getSVal(Loc location, QualType T) const {
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SVal V = getRawSVal(cast<Loc>(location), T);
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// If 'V' is a symbolic value that is *perfectly* constrained to
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// be a constant value, use that value instead to lessen the burden
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// on later analysis stages (so we have less symbolic values to reason
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// about).
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if (!T.isNull()) {
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if (SymbolRef sym = V.getAsSymbol()) {
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if (const llvm::APSInt *Int = getSymVal(sym)) {
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// FIXME: Because we don't correctly model (yet) sign-extension
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// and truncation of symbolic values, we need to convert
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// the integer value to the correct signedness and bitwidth.
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//
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// This shows up in the following:
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//
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// char foo();
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// unsigned x = foo();
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// if (x == 54)
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// ...
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//
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// The symbolic value stored to 'x' is actually the conjured
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// symbol for the call to foo(); the type of that symbol is 'char',
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// not unsigned.
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const llvm::APSInt &NewV = getBasicVals().Convert(T, *Int);
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if (isa<Loc>(V))
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return loc::ConcreteInt(NewV);
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else
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return nonloc::ConcreteInt(NewV);
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}
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}
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}
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return V;
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}
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const ProgramState *ProgramState::BindExpr(const Stmt *S, SVal V, bool Invalidate) const{
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Environment NewEnv = getStateManager().EnvMgr.bindExpr(Env, S, V,
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Invalidate);
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if (NewEnv == Env)
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return this;
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ProgramState NewSt = *this;
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NewSt.Env = NewEnv;
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return getStateManager().getPersistentState(NewSt);
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}
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const ProgramState *ProgramState::bindExprAndLocation(const Stmt *S, SVal location,
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SVal V) const {
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Environment NewEnv =
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getStateManager().EnvMgr.bindExprAndLocation(Env, S, location, V);
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if (NewEnv == Env)
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return this;
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ProgramState NewSt = *this;
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NewSt.Env = NewEnv;
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return getStateManager().getPersistentState(NewSt);
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}
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const ProgramState *ProgramState::assumeInBound(DefinedOrUnknownSVal Idx,
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DefinedOrUnknownSVal UpperBound,
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bool Assumption) const {
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if (Idx.isUnknown() || UpperBound.isUnknown())
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return this;
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// Build an expression for 0 <= Idx < UpperBound.
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// This is the same as Idx + MIN < UpperBound + MIN, if overflow is allowed.
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// FIXME: This should probably be part of SValBuilder.
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ProgramStateManager &SM = getStateManager();
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SValBuilder &svalBuilder = SM.getSValBuilder();
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ASTContext &Ctx = svalBuilder.getContext();
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// Get the offset: the minimum value of the array index type.
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BasicValueFactory &BVF = svalBuilder.getBasicValueFactory();
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// FIXME: This should be using ValueManager::ArrayindexTy...somehow.
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QualType indexTy = Ctx.IntTy;
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nonloc::ConcreteInt Min(BVF.getMinValue(indexTy));
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// Adjust the index.
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SVal newIdx = svalBuilder.evalBinOpNN(this, BO_Add,
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cast<NonLoc>(Idx), Min, indexTy);
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if (newIdx.isUnknownOrUndef())
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return this;
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// Adjust the upper bound.
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SVal newBound =
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svalBuilder.evalBinOpNN(this, BO_Add, cast<NonLoc>(UpperBound),
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Min, indexTy);
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if (newBound.isUnknownOrUndef())
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return this;
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// Build the actual comparison.
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SVal inBound = svalBuilder.evalBinOpNN(this, BO_LT,
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cast<NonLoc>(newIdx), cast<NonLoc>(newBound),
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Ctx.IntTy);
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if (inBound.isUnknownOrUndef())
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return this;
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// Finally, let the constraint manager take care of it.
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ConstraintManager &CM = SM.getConstraintManager();
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return CM.assume(this, cast<DefinedSVal>(inBound), Assumption);
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}
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const ProgramState *ProgramStateManager::getInitialState(const LocationContext *InitLoc) {
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ProgramState State(this,
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EnvMgr.getInitialEnvironment(),
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StoreMgr->getInitialStore(InitLoc),
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GDMFactory.getEmptyMap());
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return getPersistentState(State);
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}
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void ProgramStateManager::recycleUnusedStates() {
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for (std::vector<ProgramState*>::iterator i = recentlyAllocatedStates.begin(),
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e = recentlyAllocatedStates.end(); i != e; ++i) {
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ProgramState *state = *i;
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if (state->referencedByExplodedNode())
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continue;
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StateSet.RemoveNode(state);
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freeStates.push_back(state);
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state->~ProgramState();
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}
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recentlyAllocatedStates.clear();
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}
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const ProgramState *ProgramStateManager::getPersistentStateWithGDM(
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const ProgramState *FromState,
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const ProgramState *GDMState) {
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ProgramState NewState = *FromState;
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NewState.GDM = GDMState->GDM;
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return getPersistentState(NewState);
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}
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const ProgramState *ProgramStateManager::getPersistentState(ProgramState &State) {
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llvm::FoldingSetNodeID ID;
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State.Profile(ID);
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void *InsertPos;
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if (ProgramState *I = StateSet.FindNodeOrInsertPos(ID, InsertPos))
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return I;
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ProgramState *newState = 0;
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if (!freeStates.empty()) {
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newState = freeStates.back();
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freeStates.pop_back();
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}
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else {
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newState = (ProgramState*) Alloc.Allocate<ProgramState>();
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}
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new (newState) ProgramState(State);
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StateSet.InsertNode(newState, InsertPos);
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recentlyAllocatedStates.push_back(newState);
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return newState;
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}
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const ProgramState *ProgramState::makeWithStore(const StoreRef &store) const {
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ProgramState NewSt = *this;
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NewSt.setStore(store);
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return getStateManager().getPersistentState(NewSt);
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}
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void ProgramState::setStore(const StoreRef &newStore) {
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Store newStoreStore = newStore.getStore();
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if (newStoreStore)
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stateMgr->getStoreManager().incrementReferenceCount(newStoreStore);
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if (store)
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stateMgr->getStoreManager().decrementReferenceCount(store);
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store = newStoreStore;
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}
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//===----------------------------------------------------------------------===//
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// State pretty-printing.
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//===----------------------------------------------------------------------===//
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static bool IsEnvLoc(const Stmt *S) {
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// FIXME: This is a layering violation. Should be in environment.
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return (bool) (((uintptr_t) S) & 0x1);
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}
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void ProgramState::print(raw_ostream &Out, CFG *C,
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const char *NL, const char *Sep) const {
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// Print the store.
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ProgramStateManager &Mgr = getStateManager();
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Mgr.getStoreManager().print(getStore(), Out, NL, Sep);
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bool isFirst = true;
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// FIXME: All environment printing should be moved inside Environment.
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if (C) {
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// Print Subexpression bindings.
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for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
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if (C->isBlkExpr(I.getKey()) || IsEnvLoc(I.getKey()))
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continue;
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if (isFirst) {
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Out << NL << NL << "Sub-Expressions:" << NL;
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isFirst = false;
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} else {
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Out << NL;
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}
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Out << " (" << (void*) I.getKey() << ") ";
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LangOptions LO; // FIXME.
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I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
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Out << " : " << I.getData();
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}
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// Print block-expression bindings.
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isFirst = true;
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for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
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if (!C->isBlkExpr(I.getKey()))
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continue;
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if (isFirst) {
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Out << NL << NL << "Block-level Expressions:" << NL;
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isFirst = false;
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} else {
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Out << NL;
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}
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Out << " (" << (void*) I.getKey() << ") ";
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LangOptions LO; // FIXME.
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I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
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Out << " : " << I.getData();
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}
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} else {
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// Print All bindings - no info to differentiate block from subexpressions.
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for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
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if (IsEnvLoc(I.getKey()))
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continue;
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if (isFirst) {
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Out << NL << NL << "Expressions:" << NL;
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isFirst = false;
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} else {
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Out << NL;
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}
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Out << " (" << (void*) I.getKey() << ") ";
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LangOptions LO; // FIXME.
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I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
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Out << " : " << I.getData();
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}
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}
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// Print locations.
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isFirst = true;
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for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
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if (!IsEnvLoc(I.getKey()))
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continue;
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if (isFirst) {
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Out << NL << NL << "Load/store locations:" << NL;
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isFirst = false;
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} else {
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Out << NL;
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}
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const Stmt *S = (Stmt*) (((uintptr_t) I.getKey()) & ((uintptr_t) ~0x1));
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Out << " (" << (void*) S << ") ";
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LangOptions LO; // FIXME.
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S->printPretty(Out, 0, PrintingPolicy(LO));
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Out << " : " << I.getData();
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}
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Mgr.getConstraintManager().print(this, Out, NL, Sep);
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// Print checker-specific data.
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Mgr.getOwningEngine()->printState(Out, this, NL, Sep);
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}
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void ProgramState::printDOT(raw_ostream &Out, CFG &C) const {
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print(Out, &C, "\\l", "\\|");
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}
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void ProgramState::dump(CFG &C) const {
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print(llvm::errs(), &C);
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}
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void ProgramState::dump() const {
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print(llvm::errs(), 0);
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}
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//===----------------------------------------------------------------------===//
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// Generic Data Map.
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//===----------------------------------------------------------------------===//
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void *const* ProgramState::FindGDM(void *K) const {
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return GDM.lookup(K);
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}
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void*
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ProgramStateManager::FindGDMContext(void *K,
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void *(*CreateContext)(llvm::BumpPtrAllocator&),
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void (*DeleteContext)(void*)) {
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std::pair<void*, void (*)(void*)>& p = GDMContexts[K];
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if (!p.first) {
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p.first = CreateContext(Alloc);
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p.second = DeleteContext;
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}
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return p.first;
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}
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const ProgramState *ProgramStateManager::addGDM(const ProgramState *St, void *Key, void *Data){
|
|
ProgramState::GenericDataMap M1 = St->getGDM();
|
|
ProgramState::GenericDataMap M2 = GDMFactory.add(M1, Key, Data);
|
|
|
|
if (M1 == M2)
|
|
return St;
|
|
|
|
ProgramState NewSt = *St;
|
|
NewSt.GDM = M2;
|
|
return getPersistentState(NewSt);
|
|
}
|
|
|
|
const ProgramState *ProgramStateManager::removeGDM(const ProgramState *state, void *Key) {
|
|
ProgramState::GenericDataMap OldM = state->getGDM();
|
|
ProgramState::GenericDataMap NewM = GDMFactory.remove(OldM, Key);
|
|
|
|
if (NewM == OldM)
|
|
return state;
|
|
|
|
ProgramState NewState = *state;
|
|
NewState.GDM = NewM;
|
|
return getPersistentState(NewState);
|
|
}
|
|
|
|
bool ScanReachableSymbols::scan(nonloc::CompoundVal val) {
|
|
for (nonloc::CompoundVal::iterator I=val.begin(), E=val.end(); I!=E; ++I)
|
|
if (!scan(*I))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ScanReachableSymbols::scan(const SymExpr *sym) {
|
|
unsigned &isVisited = visited[sym];
|
|
if (isVisited)
|
|
return true;
|
|
isVisited = 1;
|
|
|
|
if (!visitor.VisitSymbol(sym))
|
|
return false;
|
|
|
|
// TODO: should be rewritten using SymExpr::symbol_iterator.
|
|
switch (sym->getKind()) {
|
|
case SymExpr::RegionValueKind:
|
|
case SymExpr::ConjuredKind:
|
|
case SymExpr::DerivedKind:
|
|
case SymExpr::ExtentKind:
|
|
case SymExpr::MetadataKind:
|
|
break;
|
|
case SymExpr::CastSymbolKind:
|
|
return scan(cast<SymbolCast>(sym)->getOperand());
|
|
case SymExpr::SymIntKind:
|
|
return scan(cast<SymIntExpr>(sym)->getLHS());
|
|
case SymExpr::IntSymKind:
|
|
return scan(cast<IntSymExpr>(sym)->getRHS());
|
|
case SymExpr::SymSymKind: {
|
|
const SymSymExpr *x = cast<SymSymExpr>(sym);
|
|
return scan(x->getLHS()) && scan(x->getRHS());
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool ScanReachableSymbols::scan(SVal val) {
|
|
if (loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(&val))
|
|
return scan(X->getRegion());
|
|
|
|
if (nonloc::LocAsInteger *X = dyn_cast<nonloc::LocAsInteger>(&val))
|
|
return scan(X->getLoc());
|
|
|
|
if (SymbolRef Sym = val.getAsSymbol())
|
|
return scan(Sym);
|
|
|
|
if (const SymExpr *Sym = val.getAsSymbolicExpression())
|
|
return scan(Sym);
|
|
|
|
if (nonloc::CompoundVal *X = dyn_cast<nonloc::CompoundVal>(&val))
|
|
return scan(*X);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ScanReachableSymbols::scan(const MemRegion *R) {
|
|
if (isa<MemSpaceRegion>(R))
|
|
return true;
|
|
|
|
unsigned &isVisited = visited[R];
|
|
if (isVisited)
|
|
return true;
|
|
isVisited = 1;
|
|
|
|
// If this is a symbolic region, visit the symbol for the region.
|
|
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(R))
|
|
if (!visitor.VisitSymbol(SR->getSymbol()))
|
|
return false;
|
|
|
|
// If this is a subregion, also visit the parent regions.
|
|
if (const SubRegion *SR = dyn_cast<SubRegion>(R))
|
|
if (!scan(SR->getSuperRegion()))
|
|
return false;
|
|
|
|
// Now look at the binding to this region (if any).
|
|
if (!scan(state->getSValAsScalarOrLoc(R)))
|
|
return false;
|
|
|
|
// Now look at the subregions.
|
|
if (!SRM.get())
|
|
SRM.reset(state->getStateManager().getStoreManager().
|
|
getSubRegionMap(state->getStore()));
|
|
|
|
return SRM->iterSubRegions(R, *this);
|
|
}
|
|
|
|
bool ProgramState::scanReachableSymbols(SVal val, SymbolVisitor& visitor) const {
|
|
ScanReachableSymbols S(this, visitor);
|
|
return S.scan(val);
|
|
}
|
|
|
|
bool ProgramState::scanReachableSymbols(const SVal *I, const SVal *E,
|
|
SymbolVisitor &visitor) const {
|
|
ScanReachableSymbols S(this, visitor);
|
|
for ( ; I != E; ++I) {
|
|
if (!S.scan(*I))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool ProgramState::scanReachableSymbols(const MemRegion * const *I,
|
|
const MemRegion * const *E,
|
|
SymbolVisitor &visitor) const {
|
|
ScanReachableSymbols S(this, visitor);
|
|
for ( ; I != E; ++I) {
|
|
if (!S.scan(*I))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
const ProgramState* ProgramState::addTaint(const Stmt *S,
|
|
TaintTagType Kind) const {
|
|
SymbolRef Sym = getSVal(S).getAsSymbol();
|
|
assert(Sym && "Cannot add taint to statements whose value is not a symbol");
|
|
return addTaint(Sym, Kind);
|
|
}
|
|
|
|
const ProgramState* ProgramState::addTaint(SymbolRef Sym,
|
|
TaintTagType Kind) const {
|
|
const ProgramState *NewState = set<TaintMap>(Sym, Kind);
|
|
assert(NewState);
|
|
return NewState;
|
|
}
|
|
|
|
bool ProgramState::isTainted(const Stmt *S, TaintTagType Kind) const {
|
|
SVal val = getSVal(S);
|
|
return isTainted(val, Kind);
|
|
}
|
|
|
|
bool ProgramState::isTainted(SVal V, TaintTagType Kind) const {
|
|
if (const SymExpr *Sym = V.getAsSymExpr())
|
|
return isTainted(Sym, Kind);
|
|
if (loc::MemRegionVal *RegVal = dyn_cast<loc::MemRegionVal>(&V))
|
|
return isTainted(RegVal->getRegion(), Kind);
|
|
return false;
|
|
}
|
|
|
|
bool ProgramState::isTainted(const MemRegion *Reg, TaintTagType K) const {
|
|
if (!Reg)
|
|
return false;
|
|
|
|
// Element region (array element) is tainted if either the base or the offset
|
|
// are tainted.
|
|
if (const ElementRegion *ER = dyn_cast<ElementRegion>(Reg))
|
|
return isTainted(ER->getSuperRegion(), K) || isTainted(ER->getIndex(), K);
|
|
|
|
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(Reg))
|
|
return isTainted(SR->getSymbol(), K);
|
|
|
|
if (const SubRegion *ER = dyn_cast<SubRegion>(Reg))
|
|
return isTainted(ER->getSuperRegion(), K);
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ProgramState::isTainted(const SymExpr* Sym, TaintTagType Kind) const {
|
|
if (!Sym)
|
|
return false;
|
|
|
|
// Traverse all the symbols this symbol depends on to see if any are tainted.
|
|
bool Tainted = false;
|
|
for (SymExpr::symbol_iterator SI = Sym->symbol_begin(), SE =Sym->symbol_end();
|
|
SI != SE; ++SI) {
|
|
assert(isa<SymbolData>(*SI));
|
|
const TaintTagType *Tag = get<TaintMap>(*SI);
|
|
Tainted = (Tag && *Tag == Kind);
|
|
|
|
// If this is a SymbolDerived with a tainted parent, it's also tainted.
|
|
if (const SymbolDerived *SD = dyn_cast<SymbolDerived>(*SI))
|
|
Tainted = Tainted || isTainted(SD->getParentSymbol(), Kind);
|
|
|
|
// If memory region is tainted, data is also tainted.
|
|
if (const SymbolRegionValue *SRV = dyn_cast<SymbolRegionValue>(*SI))
|
|
Tainted = Tainted || isTainted(SRV->getRegion(), Kind);
|
|
|
|
if (Tainted)
|
|
return true;
|
|
}
|
|
|
|
return Tainted;
|
|
}
|