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author | Hans Wennborg <hans@hanshq.net> | 2017-08-21 20:27:26 +0000 |
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committer | Hans Wennborg <hans@hanshq.net> | 2017-08-21 20:27:26 +0000 |
commit | 16b986343f64f416abbecfa0da51a481e86cf588 (patch) | |
tree | da95688f61ad0ad4cddb57a88b0ea930c378dc3f /lib/AST/DeclCXX.cpp | |
parent | 606412eb2a44f0513512a1fbba7c5872c420bd43 (diff) |
Merging r311182:
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r311182 | alexshap | 2017-08-18 11:20:43 -0700 (Fri, 18 Aug 2017) | 22 lines
[analyzer] Fix modeling of constructors
This diff fixes analyzer's crash (triggered assert) on the newly added test case.
The assert being discussed is assert(!B.lookup(R, BindingKey::Direct))
in lib/StaticAnalyzer/Core/RegionStore.cpp, however the root cause is different.
For classes with empty bases the offsets might be tricky.
For example, let's assume we have
struct S: NonEmptyBase, EmptyBase {
...
};
In this case Clang applies empty base class optimization and
the offset of EmptyBase will be 0, it can be verified via
clang -cc1 -x c++ -v -fdump-record-layouts main.cpp -emit-llvm -o /dev/null.
When the analyzer tries to perform zero initialization of EmptyBase
it will hit the assert because that region
has already been "written" by the constructor of NonEmptyBase.
Test plan:
make check-all
Differential revision: https://reviews.llvm.org/D36851
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@311378 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/AST/DeclCXX.cpp')
0 files changed, 0 insertions, 0 deletions