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author | Artem Dergachev <artem.dergachev@gmail.com> | 2018-09-26 00:17:14 +0000 |
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committer | Artem Dergachev <artem.dergachev@gmail.com> | 2018-09-26 00:17:14 +0000 |
commit | 8e0f894a0e674223969246d91e61416de9bfb133 (patch) | |
tree | 846a369fbbdec75f1774fa34ab108e07ea75c739 /lib/StaticAnalyzer/Core/Store.cpp | |
parent | c531bbd2d9553f1f337d9deb8fe0a9b6905dd2f4 (diff) | |
download | clang-8e0f894a0e674223969246d91e61416de9bfb133.tar.gz |
[analyzer] Fix a crash on casting symbolic pointers to derived classes.
Commit r340984 causes a crash when a pointer to a completely unrelated type
UnrelatedT (eg., opaque struct pattern) is being casted from base class BaseT to
derived class DerivedT, which results in an ill-formed region
Derived{SymRegion{$<UnrelatedT x>}, DerivedT}.
Differential Revision: https://reviews.llvm.org/D52189
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343051 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/StaticAnalyzer/Core/Store.cpp')
-rw-r--r-- | lib/StaticAnalyzer/Core/Store.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/StaticAnalyzer/Core/Store.cpp b/lib/StaticAnalyzer/Core/Store.cpp index c3b706d90f..cc9939a68d 100644 --- a/lib/StaticAnalyzer/Core/Store.cpp +++ b/lib/StaticAnalyzer/Core/Store.cpp @@ -375,8 +375,18 @@ SVal StoreManager::attemptDownCast(SVal Base, QualType TargetType, MR = Uncasted; } + // If we're casting a symbolic base pointer to a derived class, use + // CXXDerivedObjectRegion to represent the cast. If it's a pointer to an + // unrelated type, it must be a weird reinterpret_cast and we have to + // be fine with ElementRegion. TODO: Should we instead make + // Derived{TargetClass, Element{SourceClass, SR}}? if (const auto *SR = dyn_cast<SymbolicRegion>(MR)) { - return loc::MemRegionVal(MRMgr.getCXXDerivedObjectRegion(TargetClass, SR)); + QualType T = SR->getSymbol()->getType(); + const CXXRecordDecl *SourceClass = T->getPointeeCXXRecordDecl(); + if (TargetClass && SourceClass && TargetClass->isDerivedFrom(SourceClass)) + return loc::MemRegionVal( + MRMgr.getCXXDerivedObjectRegion(TargetClass, SR)); + return loc::MemRegionVal(GetElementZeroRegion(SR, TargetType)); } // We failed if the region we ended up with has perfect type info. |