is an algorithm that is much easier to understand and slightly more efficient.
Thanks to Mike Stump for our discussions on the CFGBuilder and his comments that
helped prompt this long needed cleanup.
llvm-svn: 76250
until Doug Gregor's Type smart pointer code lands (or more discussion occurs).
These methods just call the new Type::getAs<XXX> methods, so we still have
reduced implementation redundancy. Having explicit getAsXXXType() methods makes
it easier to set breakpoints in the debugger.
llvm-svn: 76193
This method is intended to eventually replace the individual
Type::getAsXXXType<> methods.
The motivation behind this change is twofold:
1) Reduce redundant implementations of Type::getAsXXXType() methods. Most of
them are basically copy-and-paste.
2) By centralizing the implementation of the getAs<Type> logic we can more
smoothly move over to Doug Gregor's proposed canonical type smart pointer
scheme.
Along with this patch:
a) Removed 'Type::getAsPointerType()'; now clients use getAs<PointerType>.
b) Removed 'Type::getAsBlockPointerTypE()'; now clients use getAs<BlockPointerType>.
llvm-svn: 76098
ValueManager::makeArrayIndex()/convertArrayIndex() methods. This
handles yet another crash case when reasoning about array indices of
different bitwidth and signedness.
llvm-svn: 75884
(1) Moved the SValuator object from GRExprEngine to ValueManager. This
allows ValueManager to use the SValuator when creating SVals.
(2) Added ValueManager::makeArrayIndex() and
ValueManager::convertToArrayIndex(), two SVal creation methods
that will help RegionStoreManager always have a consistent set of
SVals with the same integer size and type when reasoning about
array indices.
llvm-svn: 75882
This patch causes:
- StoreManager::InvalidateRegion() to not used the casted type of a region if
it would cause a pointer type to be invalidated as a non-pointer type.
- Pushes RegionStore::RetrieveElement() further by handling retrievals from
symbolic arrays that have been invalidated. This uses the new SymbolDerived
construct that was recently introduced.
The result is that the failing test in misc-ps-region-store-x86_64.m now passes.
Both misc-ps-region-store-x86_64.m and misc-ps-region-store-i386.m contain a
test case that motivated this change.
llvm-svn: 75730
SymbolDerived allows us to model symbolic values that are related to other
symbols via a region hierarchy. For example, SymbolDerived can be used to model
individual values of a symbolic array.
llvm-svn: 75728
I don't love the name, however it simplifies the code and is a worthwhile change. If/when we come up with a better name, we can do a search/replace.
llvm-svn: 75650
invalidate the region correctly. It uses the cast-to type to invalidate
the region when available. To avoid invalid cast-to type like 'void*' or 'id',
region store now only records non-generic casts of regions.
llvm-svn: 75580
are not explicitly marked as not accepting NULL pointers. This check illustrates
how we need more refactoring in the custom-check logic.
llvm-svn: 75570
where we are comparing a symbolic value against itself, regardless of
the nature of that symbolic value.
This enhancement identified a case where RegionStoreManager is not
correctly symbolicating the values of the pointees of parameters. The
failing test is now in 'test/Analysis/misc-ps-region-store.m', with
that test file now (temporarily) marked XFAIL.
llvm-svn: 75521
The idea is to segregate Objective-C "object" pointers from general C pointers (utilizing the recently added ObjCObjectPointerType). The fun starts in Sema::GetTypeForDeclarator(), where "SomeInterface *" is now represented by a single AST node (rather than a PointerType whose Pointee is an ObjCInterfaceType). Since a significant amount of code assumed ObjC object pointers where based on C pointers/structs, this patch is very tedious. It should also explain why it is hard to accomplish this in smaller, self-contained patches.
This patch does most of the "heavy lifting" related to moving from PointerType->ObjCObjectPointerType. It doesn't include all potential "cleanups". The good news is additional cleanups can be done later (some are noted in the code). This patch is so large that I didn't want to include any changes that are purely aesthetic.
By making the ObjC types truly built-in, they are much easier to work with (and require fewer "hacks"). For example, there is no need for ASTContext::isObjCIdStructType() or ASTContext::isObjCClassStructType()! We believe this change (and the follow-up cleanups) will pay dividends over time.
Given the amount of code change, I do expect some fallout from this change (though it does pass all of the clang tests). If you notice any problems, please let us know asap! Thanks.
llvm-svn: 75314
CodeTextRegions can only be casted to FunctionPointer or BlockPointerTypes. This
simply isn't true. We can handle bogus operations on CodeTextRegions (e.g, an
array access) elsewhere.
llvm-svn: 75285
and replace the 'clang-cc' option '-analyzer-store=basic-new-cast' with
'-analyzer-store=basic-old-cast'. We'll keep the old CastRegion implementation
around for a little while for regression testing.
llvm-svn: 75209
- Refactor logic that creates ElementRegions into a help method 'MakeElementRegion'.
- Fix crash due to not handling StringRegions. Casts of StringRegions now
result in a new ElementRegion layered on the original StringRegion.
llvm-svn: 74867
(its superclass). This will allow us to experiment with using the new CastRegion
with BasicStoreManager, and gradually phase out the old implementation.
llvm-svn: 74851
ValueManager::getRegionValueSymbolVal() with unguarded calls to
ValueManager::getRegionValueSymbolValOrUnknown(). This changes centralizes the
decision of what values to symbolicate in SymbolManager rather than having it
scatter in RegionStoreManager.
llvm-svn: 74730
pass misc-ps.m. Currently RegionStore/BasicStore don't do any special reasoning
about clang-style vectors, so we should return UnknownVal (in all cases) when
accessing their values via an array.
llvm-svn: 74660
TypedRegion. While we plan on removing this code at some point, it serves as a
good reference implementation for use with BasicStore until we are sure the new
CastRegion logic (in RegionStore.cpp) is correct.
llvm-svn: 74559
unknown for it.
Mark the super region of a live region as live, if the live region is pointed
to by a live pointer variable.
These fixes xfail_regionstore_wine_crash.c.
llvm-svn: 74524
Remove ASTContext parameter from DeclContext's methods. This change cascaded down to other Decl's methods and changes to call sites started "escalating".
Timings using pre-tokenized "cocoa.h" showed only a ~1% increase in time run between and after this commit.
llvm-svn: 74506
The implementations of these methods can Use Decl::getASTContext() to get the ASTContext.
This commit touches a lot of files since call sites for these methods are everywhere.
I used pre-tokenized "carbon.h" and "cocoa.h" headers to do some timings, and there was no real time difference between before the commit and after it.
llvm-svn: 74501
This is simple enough, but then I thought it would be nice to make PrintingPolicy
get a LangOptions so that various things can key off "bool" and "C++" independently.
This spiraled out of control. There are many fixme's, but I think things are slightly
better than they were before.
One thing that can be improved: CFG should probably have an ASTContext pointer in it,
which would simplify its clients.
llvm-svn: 74493
GRTransferFuncs had the conflated role of both constructing SVals (symbolic
expressions) as well as handling checker-specific logic. Now SValuator has the
role of constructing SVals from expressions and GRTransferFuncs just handles
checker-specific logic. The motivation is by separating these two concepts we
will be able to much more easily create richer constraint-generating logic
without coupling it to the main checker transfer function logic.
We now have one implementation of SValuator: SimpleSValuator.
SimpleSValuator is essentially the SVal-related logic that was in GRSimpleVals
(which is removed in this patch). This includes the logic for EvalBinOp,
EvalCast, etc. Because SValuator has a narrower role than the old
GRTransferFuncs, the interfaces are much simpler, and so is the implementation
of SimpleSValuator compared to GRSimpleVals. I also did a line-by-line review of
SVal-related logic in GRSimpleVals and cleaned it up while moving it over to
SimpleSValuator.
As a consequence of removing GRSimpleVals, there is no longer a
'-checker-simple' option. The '-checker-cfref' did everything that option did
but also ran the retain/release checker. Of course a user may not always wish to
run the retain/release checker, nor do we wish core analysis logic buried in the
checker-specific logic. The next step is to refactor the logic in CFRefCount.cpp
to separate out these pieces into the core analysis engine.
llvm-svn: 74229
- Change implementation of MemRegion::hasStackStorage()/hasHeapStorage() to use
'getMemorySpace()'. This avoids a double traversal up the region hierarchy
and is simpler.
- Add MemRegion::hasHeapOrStackStorage() as a slightly more efficient
alternative to 'hasStackStorage() || hasHeapStorage()'.
llvm-svn: 73977
- Embed a reference to MemRegionManager objects in MemSpaceRegion objects
- Use this embedded reference for MemRegion objects to access ASTContext objects without external help
- Use this access to ASTContext to simplify 'isBoundable' (no ASTContext& argument required)
llvm-svn: 73935
member template functions and traits. The idea is to allow MemRegionManager to
construct subclasses of MemRegion that aren't declared in MemRegion.h (e.g.,
checker-specific regions).
llvm-svn: 73917
- Remove the 'isFeasible' flag from all uses of 'Assume'.
- Remove the 'Assume' methods from GRStateManager. Now the only way to
create a new GRState with an assumption is to use the new 'assume' methods
in GRState.
llvm-svn: 73731
Add a type (ObjCObjectPointerType) and remove a type (ObjCQualifiedIdType).
This large/tedious patch is just a first step. Next step is to remove ObjCQualifiedInterfaceType. After that, I will remove the magic TypedefType for 'id' (installed by Sema). This work will enable various simplifications throughout clang (when dealing with ObjC types).
No functionality change.
llvm-svn: 73649
GRState object has a direct reference to its GRStateManager, making
the functionality of GRStateRef redunandant. This will lead to some
nice API cleanup and code shrinking across libAnalysis.
llvm-svn: 73644
- Add "sections" to RegionStoreManager.cpp to delineate functionality.
- Add new function "CreateFieldsOnlyRegionStoreManager" that uses the new
RegionStoreFeatures class to use a reduced set of features from
RegionStoreManager (in this case, only field-sensitivity). This isn't
completely hooked up yet.
llvm-svn: 73572
preprocessor and initialize it early in clang-cc. This
ensures that __has_builtin works in all modes, not just
when ASTContext is around.
llvm-svn: 73319
RegionStore needs to know the type of alloca region.
* RegionStoreManager::EvalBinOp() now converts the alloca region to its first
element region, as what is done to symbolic region.
llvm-svn: 72164
generation when EvalObjCMessageExpr() did not resolve the
ObjCInterfaceDecl* for a receiver when the receiver's symbolic value
wasn't being explicitly tracked.
llvm-svn: 71685
array region, set its default value to conjured symbol. When retrieving its
element, create new region value symbol for the element.
Also fix some 80 columns violations.
llvm-svn: 71548
where an owned one is expected. Also add preliminary checking for
returning a positive retain count object in GC mode where an owned GC
object is expected.
llvm-svn: 71388
Modify getLValueElement accordingly. Now we don't require base region
to be a typed region. Do not create TypedViewRegion when base region is
symbolic or alloca region. We can do so because each element region has
its type information.
llvm-svn: 71355
implicitly be changed to unsigned values in GRSimpleVals.cpp. This can happen
when the comparison involves logic in specialized transfer functions (e.g.,
OSAtomicCompareAndSwap).
llvm-svn: 71200
'BugReporterVisitor'. This simplifies callbacks from BugReporter to BugReports
(via VisitNode). It also lays the foundation for arbitrary visitor "call backs"
that can be registered to a BugReporterContext as a PathDiagnostic is
constructed. These call backs can help operate as separate "experts" that can
work on constructed pieces of a PathDiagnostic for which they possess special
knowledge.
llvm-svn: 71121
- Update the old StoreManager::CastRegion to strip off 'ElementRegions' when
casting to void* (Zhongxing: please validate)
- Pass-by-reference argument invalidation logic in CFRefCount.cpp:
- Strip ElementRegions when the ElementRegion is just a 'raw data' view
on top of the underlying typed region.
llvm-svn: 71094
- add a static function getTypeWidth(), which computes the width of a type
with the help of TargetInfo.
- no-outofbounds.c now passes for region store.
llvm-svn: 71080
'objc_ownership_cfretain' -> 'cf_ownership_retain'
'objc_ownership_cfrelease' -> 'cf_ownership_release'
Motivation: Core Foundation objects can be used in isolation from Objective-C,
and this forces users to reason about the separate semantics of CF objects. More
Sema support pending.
llvm-svn: 70884
'ElementRegion' on top of the VarRegion for 'x'. This causes the test
case xfail_wine_crash.c to now pass for BasicStoreManager. It doesn't
crash for RegionStoreManager either, but reports a bogus unintialized
value warning.
llvm-svn: 70832
Ted Kremenek