[LLVMdev] Stack trace - clang

Daniel Dunbar daniel at zuster.org
Mon Aug 9 14:11:20 PDT 2010

Hi Bin,

It sounds like you are running gdb on the driver (which spawns off the
actual compilation step). Try running Clang with '-###', and run gdb
using the first command line it prints out.

Also, please send Clang questions to cfe-dev at cs.uiuc.edu

 - Daniel

On Mon, Aug 9, 2010 at 10:37 AM, Bin Zeng <ezengbin at gmail.com> wrote:
>  Hi,
> I am new to LLVM and am trying to modify clang for some work. I tried to
> insert an instruction: prefetchnta $100 at the beginning of a function.
> I encountered a problem when I tried to debug it with gdb. There was an
> assertion failure and printed some information without stack trace. The
> process has been finished when it printed the information. I tried to
> set a breakpoint at the operator[] with:
> break
> llvm::SmallVectorTemplateCommon<llvm::MCOperand>::operator[](unsigned int)
>  The program did not stop there either.  Here is what it printed. The
> question is: how can I print the stack trace when there is an assertion
> failure. Thanks tons.
> clang: /export/home/zbin/llvm/llvm/include/llvm/ADT/SmallVector.h:163:
> const T& llvm::SmallVectorTemplateCommon<T>::operator[](unsigned int)
> const [with T = llvm::MCOperand]: Assertion `begin() + idx < end()' failed.
> 0  clang 0x094b90d8
> Stack dump:
> 0.      Program arguments:
> /export/home/zbin/llvm/llvm/Release+Asserts/bin/clang -cc1 -triple
> i386-pc-linux-gnu -S -disable-free -main-file-name helloworld.c
> -mrelocation-model static -mdisable-fp-elim -mconstructor-aliases
> -target-cpu pentium4 -resource-dir
> /export/home/zbin/llvm/llvm/Release+Asserts/lib/clang/2.8 -ferror-limit
> 19 -fmessage-length 95 -fgnu-runtime -fdiagnostics-show-option
> -fcolor-diagnostics -o /tmp/cc-x4r76v.s -x c helloworld.c
> 1. <eof> parser at end of file
> 2.      Code generation
> 3.      Running pass 'X86 AT&T-Style Assembly Printer' on function '@main'
> clang: error: clang frontend command failed due to signal 6 (use -v to
> see invocation)
> clang is built with gmake ENABLE_OPTIMIZED=1 .
> Also I tried with the debug version of clang. It did not work either. I
> am really stumped on this bug. Thank you very much.
> Bin
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