[LLVMdev] Instrumentation with liblto and gold

[John Criswell]

On 3/24/11 7:10 PM, Sangmin Park wrote:
> Hi John,
>
> Thank you for your advice.
> LIBS and LDFLAGS work for the configure script,
> but they gave errors in the make stage for apache and mysql.
>
> I used either of the following ones with other flags:
> - export LIBS="-L/home/sangmin/Dropbox/Falcon/bin/ -ldummy"
> - export LDFLAGS="-L/home/sangmin/Dropbox/Falcon/bin/ -ldummy"
>
> Here are the error messages:
>
> Compile error (apache):
> make[3]: Entering directory `/home/sangmin/Concurrency/apache/srclib/apr'
> /bin/bash /home/sangmin/Concurrency/apache/srclib/apr/libtool --silent 
> --mode=link llvm-gcc -use-gold-plugin -pthread -O4 -DHAVE_CONFIG_H 
> -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -I./include -I../include 
> -version-info 9:5:9 -L/home/sangmin/Dropbox/Falcon/bin/ -ldummy -o 
> libapr-0.la <http://libapr-0.la> -rpath 
> /home/sangmin/Concurrency/apache-25520-llvm//lib 
> strings/apr_cpystrn.lo strings/apr_fnmatch.lo strings/apr_snprintf.lo 
> <skip>
> collect2: ld terminated with signal 6 [Aborted]
> ld: 
> /home/sangmin/Dropbox/Falcon/src/llvm-2.7/include/llvm/Support/Casting.h:200: 
> typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) 
> [with X = llvm::Instruction, Y = llvm::Value*]: Assertion `isa<X>(Val) 
> && "cast<Ty>() argument of incompatible type!"' failed.

It looks like there is something wrong with your instrumentation pass.  
You'll need to run the debugger on the linker.  I think you can get 
llvm-gcc to dump out the command line it uses for linking with some 
option; checks the gcc docs.

-- John T.

> Stack dump:
> 0.Running pass 'Function Pass Manager' on module 'ld-temp.o'.
> 1.Running pass 'Function pass' on function 
> '@apr_proc_other_child_refresh_all'
>
> Compile error (mysql):
> ake[2]: Entering directory `/home/sangmin/Concurrency/mysql/libmysql'
> /bin/bash ../libtool --mode=link llvm-gcc -use-gold-plugin  -O3 
> -DDBUG_OFF -O4   -L/home/sangmin/Dropbox/Falcon/bin/ -ldummy -rdynamic 
>  -o conf_to_src  conf_to_src.o  -lz -lcrypt -lnsl -lm
> llvm-gcc -use-gold-plugin -O3 -DDBUG_OFF -O4 -rdynamic -o conf_to_src 
> conf_to_src.o  -L/home/sangmin/Dropbox/Falcon/bin/ -ldummy -lz -lcrypt 
> -lnsl -lm
> collect2: ld terminated with signal 6 [Aborted]
> ld: 
> /home/sangmin/Dropbox/Falcon/src/llvm-2.7/include/llvm/Support/Casting.h:200: 
> typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) 
> [with X = llvm::Instruction, Y = llvm::Value*]: Assertion `isa<X>(Val) 
> && "cast<Ty>() argument of incompatible type!"' failed.
> Stack dump:
> 0.Running pass 'Function Pass Manager' on module 'ld-temp.o'.
> 1.Running pass 'Function pass' on function '@print_arrays_for'
>
> Any thoughts?
>
> Thanks,
> Sangmin
>
> On Thu, Mar 24, 2011 at 7:26 PM, John Criswell <criswell at illinois.edu 
> <mailto:criswell at illinois.edu>> wrote:
>
>     On 3/24/11 6:23 PM, Sangmin Park wrote:
>
>         Hi,
>
>         I need advice in instrumenting programs using liblto and gold
>         plugin.
>         Specifically, I added my pass in tools/lto/LTOCodeGenerator.cpp.
>         My pass inserts functions (myLoad and myStore) for some load
>         and store instructions.
>         The functions exist in a library file.
>
>         I found that the approach works for the example in the link:
>         http://llvm.org/docs/GoldPlugin.html
>         $ llvm-gcc -flto a.c -c -o a.o
>         $ ar q a.a a.o
>         $ llvm-gcc b.c -c -o b.o
>         $ llvm-gcc -use-gold-plugin a.a b.o -L<path_to_my_lib>
>         -l<my_lib> -o main
>
>         I also found that I can compile large programs (apache and
>         mysql) with gold plugin.
>         Here is the command:
>         $ export CC="llvm-gcc -use-gold-plugin"; export CXX="llvm-g++
>         -use-gold-plugin"; export RANLIB=/bin/true; export CFLAGS="-O4";
>         $ ./configure
>         $ make
>         $ make install
>
>         However, I cannot compile large programs with modified liblto
>         and gold plugin.
>         That is because I have to specify the path to my library
>         containing myLoad and myStore in configure and makefile.
>
>         Is there any fancy way to handle this problem?
>
>
>     The configure scripts might recognize the LIBS and LDFLAGS
>     variables and add them to the linker options as it does for CFLAGS
>     above.
>
>     -- John T.
>
>
>         Thanks in advance.
>
>         Sangmin
>
>
>

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