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Mark CXXThisRegion in the current or parent stack frame context as live so that 

their bindings are not removed.

llvm-svn: 98705
This commit is contained in:
Zhongxing Xu 2010-03-17 03:35:08 +00:00
parent 476e541673
commit 03fd76663e
7 changed files with 32 additions and 8 deletions
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1
clang/include/clang/Checker/PathSensitive/GRState.h
View File

@ -453,6 +453,7 @@ public:
ConstraintManager& getConstraintManager() { return *ConstraintMgr; }
const GRState* RemoveDeadBindings(const GRState* St, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper);
public:

1
clang/include/clang/Checker/PathSensitive/Store.h
View File

@ -144,6 +144,7 @@ public:
}
virtual Store RemoveDeadBindings(Store store, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots) = 0;

5
clang/lib/Checker/BasicStore.cpp
View File

@ -72,7 +72,9 @@ public:
/// RemoveDeadBindings - Scans a BasicStore of 'state' for dead values.
/// It updatees the GRState object in place with the values removed.
Store RemoveDeadBindings(Store store, Stmt* Loc, SymbolReaper& SymReaper,
Store RemoveDeadBindings(Store store, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots);
void iterBindings(Store store, BindingsHandler& f);
@ -250,6 +252,7 @@ Store BasicStoreManager::Remove(Store store, Loc loc) {
}
Store BasicStoreManager::RemoveDeadBindings(Store store, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots)
{

4
clang/lib/Checker/FlatStore.cpp
View File

@ -44,7 +44,9 @@ public:
}
SVal ArrayToPointer(Loc Array);
Store RemoveDeadBindings(Store store, Stmt* Loc, SymbolReaper& SymReaper,
Store RemoveDeadBindings(Store store, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots){
return store;
}

4
clang/lib/Checker/GRExprEngine.cpp
View File

@ -481,7 +481,9 @@ void GRExprEngine::ProcessStmt(CFGElement CE, GRStmtNodeBuilder& builder) {
SymbolReaper SymReaper(BasePred->getLocationContext(), SymMgr);
CleanedState = AMgr.shouldPurgeDead()
? StateMgr.RemoveDeadBindings(EntryNode->getState(), CurrentStmt, SymReaper)
? StateMgr.RemoveDeadBindings(EntryNode->getState(), CurrentStmt,
BasePred->getLocationContext()->getCurrentStackFrame(),
SymReaper)
: EntryNode->getState();
// Process any special transfer function for dead symbols.

3
clang/lib/Checker/GRState.cpp
View File

@ -35,6 +35,7 @@ GRStateManager::~GRStateManager() {
const GRState*
GRStateManager::RemoveDeadBindings(const GRState* state, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper) {
// This code essentially performs a "mark-and-sweep" of the VariableBindings.
@ -50,7 +51,7 @@ GRStateManager::RemoveDeadBindings(const GRState* state, Stmt* Loc,
state, RegionRoots);
// Clean up the store.
NewState.St = StoreMgr->RemoveDeadBindings(NewState.St, Loc, SymReaper,
NewState.St = StoreMgr->RemoveDeadBindings(NewState.St, Loc, LCtx, SymReaper,
RegionRoots);
return ConstraintMgr->RemoveDeadBindings(getPersistentState(NewState),

22
clang/lib/Checker/RegionStore.cpp
View File

@ -354,7 +354,9 @@ public: // Part of public interface to class.
/// RemoveDeadBindings - Scans the RegionStore of 'state' for dead values.
/// It returns a new Store with these values removed.
Store RemoveDeadBindings(Store store, Stmt* Loc, SymbolReaper& SymReaper,
Store RemoveDeadBindings(Store store, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots);
const GRState *EnterStackFrame(const GRState *state,
@ -1678,12 +1680,14 @@ class RemoveDeadBindingsWorker :
llvm::SmallVector<const SymbolicRegion*, 12> Postponed;
SymbolReaper &SymReaper;
Stmt *Loc;
const StackFrameContext *CurrentLCtx;
public:
RemoveDeadBindingsWorker(RegionStoreManager &rm, GRStateManager &stateMgr,
RegionBindings b, SymbolReaper &symReaper,
Stmt *loc)
Stmt *loc, const StackFrameContext *LCtx)
: ClusterAnalysis<RemoveDeadBindingsWorker>(rm, stateMgr, b),
SymReaper(symReaper), Loc(loc) {}
SymReaper(symReaper), Loc(loc), CurrentLCtx(LCtx) {}
// Called by ClusterAnalysis.
void VisitAddedToCluster(const MemRegion *baseR, RegionCluster &C);
@ -1713,6 +1717,15 @@ void RemoveDeadBindingsWorker::VisitAddedToCluster(const MemRegion *baseR,
return;
}
// CXXThisRegion in the current or parent location context is live.
if (const CXXThisRegion *TR = dyn_cast<CXXThisRegion>(baseR)) {
const StackArgumentsSpaceRegion *StackReg =
cast<StackArgumentsSpaceRegion>(TR->getSuperRegion());
const StackFrameContext *RegCtx = StackReg->getStackFrame();
if (RegCtx == CurrentLCtx || RegCtx->isParentOf(CurrentLCtx))
AddToWorkList(TR, C);
}
}
void RemoveDeadBindingsWorker::VisitCluster(const MemRegion *baseR,
@ -1799,11 +1812,12 @@ bool RemoveDeadBindingsWorker::UpdatePostponed() {
}
Store RegionStoreManager::RemoveDeadBindings(Store store, Stmt* Loc,
const StackFrameContext *LCtx,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots)
{
RegionBindings B = GetRegionBindings(store);
RemoveDeadBindingsWorker W(*this, StateMgr, B, SymReaper, Loc);
RemoveDeadBindingsWorker W(*this, StateMgr, B, SymReaper, Loc, LCtx);
W.GenerateClusters();
// Enqueue the region roots onto the worklist.