[llvm-bugs] [Bug 32095] New: Null pointer crash caused by dyn_cast InheritanceGraphViewer

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Feb 28 08:06:43 PST 2017


            Bug ID: 32095
           Summary: Null pointer crash caused by dyn_cast
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: arphaman at gmail.com
                CC: llvm-bugs at lists.llvm.org

Clang crashes when trying to generate inheritance graph for the record 'C' from
the following code:

  template <class T> struct A {};
  template <class U> class C: A<U>{};

Sample code from AST Visitor that reproduces this problem:

  bool Visitor::VisitCXXRecordDecl(clang::CXXRecordDecl *c) {
    if (c->getNumBases() || c->getNumVBases()) {
    return true;


  * frame #0: 0x000000010089f970
libclang.dylib`clang::TagType::getDecl(this=0x0000000000000000) const + 16 at
    frame #1: 0x00000001003dfbd5
libclang.dylib`clang::RecordType::getDecl(this=0x0000000000000000) const + 21
at Type.h:3760
    frame #2: 0x00000001007aba01 libclang.dylib`(anonymous
Type=QualType @ 0x00007fff5fbfd130, FromVirtual=false) + 2641 at
    frame #3: 0x00000001007aaee2 libclang.dylib`(anonymous
Type=QualType @ 0x00007fff5fbfd538) + 146 at InheritViz.cpp:47
    frame #4: 0x00000001007aad64
Context=0x000000010f805600) const + 564 at InheritViz.cpp:153

The problem is caused by this dyn_cast from InheritViz.cpp:

  const CXXRecordDecl *Decl
    = static_cast<const CXXRecordDecl *>(Type->getAs<RecordType>()->getDecl());

The actual type is:

InjectedClassNameType 0x7f868380e7d0 'C<U>' dependent
`-CXXRecord 0x7f868380e550 'C'

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