ClangCheckerRegistry is a very non-obvious, poorly documented, weird concept.
It derives from CheckerRegistry, and is placed in lib/StaticAnalyzer/Frontend,
whereas it's base is located in lib/StaticAnalyzer/Core. It was, from what I can
imagine, used to circumvent the problem that the registry functions of the
checkers are located in the clangStaticAnalyzerCheckers library, but that
library depends on clangStaticAnalyzerCore. However, clangStaticAnalyzerFrontend
depends on both of those libraries.
One can make the observation however, that CheckerRegistry has no place in Core,
it isn't used there at all! The only place where it is used is Frontend, which
is where it ultimately belongs.
This move implies that since
include/clang/StaticAnalyzer/Checkers/ClangCheckers.h only contained a single function:
class CheckerRegistry;
void registerBuiltinCheckers(CheckerRegistry ®istry);
it had to re purposed, as CheckerRegistry is no longer available to
clangStaticAnalyzerCheckers. It was renamed to BuiltinCheckerRegistration.h,
which actually describes it a lot better -- it does not contain the registration
functions for checkers, but only those generated by the tblgen files.
Differential Revision: https://reviews.llvm.org/D54436
llvm-svn: 349275
Previously, the iterator range checker only warned upon dereferencing of
iterators outside their valid range as well as increments and decrements of
out-of-range iterators where the result remains out-of-range. However, the C++
standard is more strict than this: decrementing begin() or incrementing end()
results in undefined behaviour even if the iterator is not dereferenced
afterwards. Coming back to the range once out-of-range is also undefined.
This patch corrects the behaviour of the iterator range checker: warnings are
given for any operation whose result is ahead of begin() or past the end()
(which is the past-end iterator itself, thus now we are speaking of past
past-the-end).
Differential Revision: https://reviews.llvm.org/D53812
llvm-svn: 348245
If an iterator is represented by a derived C++ class but its comparison operator
is for its base the iterator checkers cannot recognize the iterators compared.
This results in false positives in very straightforward cases (range error when
dereferencing an iterator after disclosing that it is equal to the past-the-end
iterator).
To overcome this problem we always use the region of the topmost base class for
iterators stored in a region. A new method called getMostDerivedObjectRegion()
was added to the MemRegion class to get this region.
Differential Revision: https://reviews.llvm.org/D54466
llvm-svn: 348244
This patch adds support for the following operations in the iterator checkers: assign, clear, insert, insert_after, emplace, emplace_after, erase and erase_after. This affects mismatched iterator checks ("this" and parameter must match) and invalidation checks (according to the standard).
Differential Revision: https://reviews.llvm.org/D32904
llvm-svn: 341794
This patch adds support for the following operations in the iterator checkers: push_back, push_front, emplace_back, emplace_front, pop_back and pop_front. This affects iterator range checks (range is extended after push and emplace and reduced after pop operations) and invalidation checks (according to the standard).
Differential Revision: https://reviews.llvm.org/D32902
llvm-svn: 341793
Extension of the mismatched iterator checker for constructors taking range of first..last (first and last must be iterators of the same container) and also for comparisons of iterators of different containers (one does not compare iterators of different containers, since the set of iterators is partially ordered, there are no relations between iterators of different containers, except that they are always non-equal).
Differential Revision: https://reviews.llvm.org/D32860
llvm-svn: 341792
If a container is moved by its move assignment operator, according to the standard all their iterators except the past-end iterators remain valid but refer to the new container. This patch introduces support for this case in the iterator checkers.
Differential Revision: https://reviews.llvm.org/D32859
llvm-svn: 341791
New check added to the checker which checks whether iterator parameters of template functions typed by the same template parameter refer to the same container.
Differential Revision: https://reviews.llvm.org/D32845
llvm-svn: 341790
We add check for invalidation of iterators. The only operation we handle here
is the (copy) assignment.
Differential Revision: https://reviews.llvm.org/D32747
llvm-svn: 340805
After cleaning up program state maps in `checkDeadSymbols()`,
a transition should be added to generate the new state.
Differential Revision: https://reviews.llvm.org/D47417
llvm-svn: 338263
The analyzer may consider a container region as dead while it still has live
iterators. We must defer deletion of the data belonging to such containers
until all its iterators are dead as well to be able to compare the iterator
to the begin and the end of the container which is stored in the container
data.
Differential Revision: https://reviews.llvm.org/D48427
llvm-svn: 338234
Marking a symbolic expression as live is non-recursive. In our checkers we
either use conjured symbols or conjured symbols plus/minus integers to
represent abstract position of iterators, so in this latter case we also
must mark the `SymbolData` part of these symbolic expressions as live to
prevent them from getting reaped.
Differential Revision: https://reviews.llvm.org/D48764
llvm-svn: 337151
Add handling of the begin() funcion of containers to the iterator checkers,
together with the pre- and postfix ++ and -- operators of the iterators. This
makes possible the checking of iterators dereferenced ahead of the begin of the
container.
Differential Revision: https://reviews.llvm.org/D32642
llvm-svn: 335835
When the loop has a null terminator statement and sets 'widen-loops=true', 'invalidateRegions' will constructs the 'SymbolConjured' with null 'Stmt'. And this will lead to a crash in 'IteratorChecker.cpp'. This patch use 'dyn_cast_or_null<>' instead of 'dyn_cast<>' in IteratorChecker.cpp.
Differential Revision: https://reviews.llvm.org/D44606
llvm-svn: 327962
In most cases using
`N->getState()->getSVal(E, N->getLocationContext())`
is ugly, verbose, and also opens up more surface area for bugs if an
inconsistent location context is used.
This patch introduces a helper on an exploded node, and ensures
consistent usage of either `ExplodedNode::getSVal` or
`CheckContext::getSVal` across the codebase.
As a result, a large number of redundant lines is removed.
Differential Revision: https://reviews.llvm.org/D42155
llvm-svn: 322753
The new checker currently contains the very core infrastructure for tracking
the state of iterator-type objects in the analyzer: relating iterators to
their containers, tracking symbolic begin and end iterator values for
containers, and solving simple equality-type constraints over iterators.
A single specific check over this infrastructure is capable of finding usage of
out-of-range iterators in some simple cases.
Patch by Ádám Balogh!
Differential revision: https://reviews.llvm.org/D32592
llvm-svn: 304160
Kristof Umann