llvm dev - Jan 2012 - [LLVMdev] TableGen Crash

Hi LLVMers,
I found a bug in TGParser that is causing llvm-tblgen to crash on bad
input. The reduced testcase is attached. The output follows:

$ ./llvm-tblgen --version
Low Level Virtual Machine (http://llvm.org/):
  LLVM version 3.1svn
  DEBUG build with assertions.
  Built Jan 20 2012 (15:46:08).
  Default target: x86_64-apple-darwin11.2.0
  Host CPU: penryn

$ ./llvm-tblgen bug.td
0  llvm-tblgen       0x0000000108964de5 _ZL15PrintStackTracePv + 53
1  llvm-tblgen       0x0000000108965459 _ZL13SignalHandleri + 361
2  libsystem_c.dylib 0x00007fff8fe73cfa _sigtramp + 26
3  libsystem_c.dylib 0x00007fff8fe713c8 malloc_zone_malloc + 77
4  llvm-tblgen       0x0000000108913f83
llvm::TGParser::ParseSubClassReference(llvm::Record*, bool) + 515
5  llvm-tblgen       0x000000010891b269
llvm::TGParser::ParseObjectBody(llvm::Record*) + 121
6  llvm-tblgen       0x000000010891bab1
llvm::TGParser::ParseDef(llvm::MultiClass*) + 1201
7  llvm-tblgen       0x000000010891cab9
llvm::TGParser::ParseObject(llvm::MultiClass*) + 153
8  llvm-tblgen       0x000000010891cb82
llvm::TGParser::ParseObjectList(llvm::MultiClass*) + 66
9  llvm-tblgen       0x000000010891f9d7 llvm::TGParser::ParseFile() + 55
10 llvm-tblgen       0x00000001088e3e63 llvm::TableGenMain(char*,
llvm::TableGenAction&) + 931
11 llvm-tblgen       0x00000001088d05c6 main + 102
12 llvm-tblgen       0x0000000108738934 start + 52
13 llvm-tblgen       0x0000000000000002 start + 18446744069272794882
Stack dump:
0.	Program arguments: ./llvm-tblgen /Users/kal/Desktop/bug.td
Segmentation fault: 11

Thanks,
Kal

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Quite right. Fixed in r148565.

Thanks!

-Jim

On Jan 20, 2012, at 6:50 AM, Kal Conley wrote:
> Hi LLVMers,
> I found a bug in TGParser that is causing llvm-tblgen to crash on bad
> input. The reduced testcase is attached. The output follows:
> 
> $ ./llvm-tblgen --version
> Low Level Virtual Machine (http://llvm.org/):
>  LLVM version 3.1svn
>  DEBUG build with assertions.
>  Built Jan 20 2012 (15:46:08).
>  Default target: x86_64-apple-darwin11.2.0
>  Host CPU: penryn
> 
> $ ./llvm-tblgen bug.td
> 0  llvm-tblgen       0x0000000108964de5 _ZL15PrintStackTracePv + 53
> 1  llvm-tblgen       0x0000000108965459 _ZL13SignalHandleri + 361
> 2  libsystem_c.dylib 0x00007fff8fe73cfa _sigtramp + 26
> 3  libsystem_c.dylib 0x00007fff8fe713c8 malloc_zone_malloc + 77
> 4  llvm-tblgen       0x0000000108913f83
> llvm::TGParser::ParseSubClassReference(llvm::Record*, bool) + 515
> 5  llvm-tblgen       0x000000010891b269
> llvm::TGParser::ParseObjectBody(llvm::Record*) + 121
> 6  llvm-tblgen       0x000000010891bab1
> llvm::TGParser::ParseDef(llvm::MultiClass*) + 1201
> 7  llvm-tblgen       0x000000010891cab9
> llvm::TGParser::ParseObject(llvm::MultiClass*) + 153
> 8  llvm-tblgen       0x000000010891cb82
> llvm::TGParser::ParseObjectList(llvm::MultiClass*) + 66
> 9  llvm-tblgen       0x000000010891f9d7 llvm::TGParser::ParseFile() + 55
> 10 llvm-tblgen       0x00000001088e3e63 llvm::TableGenMain(char*,
> llvm::TableGenAction&) + 931
> 11 llvm-tblgen       0x00000001088d05c6 main + 102
> 12 llvm-tblgen       0x0000000108738934 start + 52
> 13 llvm-tblgen       0x0000000000000002 start + 18446744069272794882
> Stack dump:
> 0.	Program arguments: ./llvm-tblgen /Users/kal/Desktop/bug.td
> Segmentation fault: 11
> 
> Thanks,
> Kal
> 
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