[LLVMbugs] [Bug 8844] New: Infinite loop and stack overflow in SemaExpr when compiling erroneous C++

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8844

           Summary: Infinite loop and stack overflow in SemaExpr when
                    compiling erroneous C++
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: devlists at shadowlab.org
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Created an attachment (id=5920)
 --> (http://llvm.org/bugs/attachment.cgi?id=5920)
Some C++ code

When compiling the attached sample, clang crash.

This is due to an infinite recursion in SemaExpr.cpp, line 3818.

-------
      // Recurse as an -> access.
      IsArrow = true;
      return LookupMemberExpr(R, BaseExpr, IsArrow, OpLoc, SS,
                              ObjCImpDecl, HasTemplateArgs);
-------

Unfortunately, IsArrow is already true, so it try again with the same
parameters, fall in the same error handler, try again, and so on until it
crashes.

>clang++ --version
clang version 2.9 (trunk 122393)
Target: x86_64-apple-darwin10
Thread model: posix

>  clang++ -fsyntax-only Test.cpp 
Test.cpp:12:21: error: member reference type 'const Sapphire::FormatDescription
*' is not a pointer; maybe you meant to use '.'?
[…]
fatal error: too many errors emitted, stopping now [-ferror-limit=]
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal 1 (use -v to see
invocation)

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