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Restructure RegionStoreManager::EvalBinOp() as a switch dispatch over different 

MemRegion kinds. This allows the compiler to identify what MemRegions we don't
handle for pointer arithmetic.

llvm-svn: 75326
This commit is contained in:
Ted Kremenek 2009-07-11 00:58:27 +00:00
parent 55179ca5aa
commit f6f0461a38
1 changed files with 58 additions and 32 deletions
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62
clang/lib/Analysis/RegionStore.cpp
View File

@ -665,43 +665,69 @@ SVal RegionStoreManager::EvalBinOp(const GRState *state,
const MemRegion* MR = cast<loc::MemRegionVal>(L).getRegion();
const ElementRegion *ER = 0;
// If the operand is a symbolic or alloca region, create the first element
// region on it.
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(MR)) {
switch (MR->getKind()) {
case MemRegion::SymbolicRegionKind: {
const SymbolicRegion *SR = cast<SymbolicRegion>(MR);
QualType T;
// If the SymbolicRegion was cast to another type, use that type.
if (const QualType *t = state->get<RegionCasts>(SR)) {
if (const QualType *t = state->get<RegionCasts>(SR))
T = *t;
} else {
else {
// Otherwise use the symbol's type.
SymbolRef Sym = SR->getSymbol();
T = Sym->getType(getContext());
}
QualType EleTy = T->getAsPointerType()->getPointeeType();
QualType EleTy = T->getAsPointerType()->getPointeeType();
SVal ZeroIdx = ValMgr.makeZeroArrayIndex();
ER = MRMgr.getElementRegion(EleTy, ZeroIdx, SR, getContext());
break;
}
else if (const AllocaRegion *AR = dyn_cast<AllocaRegion>(MR)) {
case MemRegion::AllocaRegionKind: {
// Get the alloca region's current cast type.
GRStateTrait<RegionCasts>::lookup_type T = state->get<RegionCasts>(AR);
assert(T && "alloca region has no type.");
QualType EleTy = cast<PointerType>(T->getTypePtr())->getPointeeType();
const AllocaRegion *AR = cast<AllocaRegion>(MR);
QualType T = *(state->get<RegionCasts>(AR));
QualType EleTy = T->getAsPointerType()->getPointeeType();
SVal ZeroIdx = ValMgr.makeZeroArrayIndex();
ER = MRMgr.getElementRegion(EleTy, ZeroIdx, AR, getContext());
break;
}
else if (isa<FieldRegion>(MR)) {
// Not track pointer arithmetic on struct fields.
return UnknownVal();
}
else {
case MemRegion::ElementRegionKind: {
ER = cast<ElementRegion>(MR);
break;
}
// Not yet handled.
case MemRegion::VarRegionKind:
case MemRegion::StringRegionKind:
case MemRegion::CompoundLiteralRegionKind:
case MemRegion::FieldRegionKind:
case MemRegion::ObjCObjectRegionKind:
case MemRegion::ObjCIvarRegionKind:
return UnknownVal();
// TypedViewRegion will soon be removed.
case MemRegion::TypedViewRegionKind:
return UnknownVal();
case MemRegion::CodeTextRegionKind:
// Technically this can happen if people do funny things with casts.
return UnknownVal();
case MemRegion::MemSpaceRegionKind:
assert(0 && "Cannot perform pointer arithmetic on a MemSpace");
return UnknownVal();
case MemRegion::BEG_DECL_REGIONS:
case MemRegion::END_DECL_REGIONS:
case MemRegion::BEG_TYPED_REGIONS:
case MemRegion::END_TYPED_REGIONS:
assert(0 && "Infeasible region");
return UnknownVal();
}
SVal Idx = ER->getIndex();
nonloc::ConcreteInt* Base = dyn_cast<nonloc::ConcreteInt>(&Idx);
nonloc::ConcreteInt* Offset = dyn_cast<nonloc::ConcreteInt>(&R);