[LLVMbugs] [Bug 2708] New: Crash on Objective-C and fsyntax-only

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2708

           Summary: Crash on Objective-C and fsyntax-only
           Product: clang
           Version: unspecified
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: parser
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: thomascl at free.fr
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1947)
 --> (http://llvm.org/bugs/attachment.cgi?id=1947)
test case

The attached source code produces a crash when using fsyntax-only:

--------------
thomas$ clang -fsyntax-only Objc.m 
Objc.m:3:2: error: expected identifier
+- (void)myMethod;
 ^
Objc.m:3:2: error: expected ';' after method proto
Objc.m:6:1: warning: incomplete implementation
@implementation MyClass
^
0   clang                               0x002f8f73
_ZN4llvm3sys7Program17FindProgramByNameERKSs + 611
1   clang                               0x002f923d
_ZN4llvm3sys28PrintStackTraceOnErrorSignalEv + 593
2   libSystem.B.dylib                   0x9419509b _sigtramp + 43
3   ???                                 0xffffffff 0x0 + 4294967295
4   clang                               0x001f98c5
_ZNK5clang20MultiKeywordSelector7getNameEv + 51
5   clang                               0x001f9aa9
_ZNK5clang8Selector7getNameEv + 249
6   clang                               0x0012bbe1
_ZN5clang4Sema19WarnUndefinedMethodENS_14SourceLocationEPNS_14ObjCMethodDeclERb
+ 83
7   clang                               0x0012dcbe
_ZN5clang4Sema25ImplMethodsVsClassMethodsEPNS_22ObjCImplementationDeclEPNS_17ObjCInterfaceDeclE
+ 594
8   clang                               0x0012f406
_ZN5clang4Sema10ActOnAtEndENS_14SourceLocationEPvPS2_jS3_j + 1980
9   clang                               0x001c3319
_ZN5clang6Parser25ParseObjCAtEndDeclarationENS_14SourceLocationE + 205
10  clang                               0x001c8c3e
_ZN5clang6Parser21ParseObjCAtDirectivesEv + 302
11  clang                               0x001cf06c
_ZN5clang6Parser24ParseExternalDeclarationEv + 414
12  clang                               0x001cf14d
_ZN5clang6Parser17ParseTopLevelDeclERPv + 61
13  clang                               0x0010d09e
_ZN5clang8ParseASTERNS_12PreprocessorEPNS_11ASTConsumerEb + 404
14  clang                               0x00029a1f
_Z22InitializeIncludePathsPKcRN5clang12HeaderSearchERNS1_11FileManagerERKNS1_11LangOptionsE
+ 2965
15  clang                               0x0002ab90 main + 1628
16  clang                               0x0000189e start + 54
Bus error
--------------

Looks like the parser fails to handle correctly the syntax error.
If I remove the @implementation block, there's no crash anymore.
LLVM anc Clang rev 55175.

Thomas


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