[LLVMbugs] [Bug 13987] New: A crash on (late parsed) lambda body with local class.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Oct 1 10:11:32 PDT 2012


             Bug #: 13987
           Summary: A crash on (late parsed) lambda body with local class.
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: zaffanella at cs.unipr.it
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following code shows a crash in (debug mode) clang++:

$ cat crash.cc
class Class {
  void Method(char c = []()->char {
      int d = []()->int {
        struct LateParsedClass {
          int LateParsedMethod() { return 0; }
        return 0;
      return d;

$ clang++ -fsyntax-only -std=c++11 crash.cc
clang: SemaDecl.cpp:913: void clang::Sema::PushDeclContext(clang::Scope*,
clang::DeclContext*): Assertion `getContainingDC(DC) == CurContext && "The next
DeclContext should be lexically contained in the current one."' failed.

It seems that, when parsing (LateParsedMethod inside) LateParsedClass, the
value of Sema.CurContext is still that of the outer class Class, while the
(lexical) DC of LateParsedClass is that of the inner lambda operator() method,
hence the assertion failure.

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