llvm dev - Apr 2012 - [LLVMdev] Problems on getting the OPT resultant bitcode

Hi,
I want to write a piece of code to instrument c++ programs. I have finished
writing the pass, but I do not know how to get the resultant bitcode
I ran OPT with the following arguments:
opt -basiccg -basicaa -load /home/andy/llvm-3.0.src/Release/lib/InstTest.so
-InstTest
</home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc>
-o=</home/andy/output/out.bc> /dev/null
where </home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc>
is the input file, and </home/andy/output/out.bc> is the expected output
file. InstTest is my pass.
However, opt treat </home/andy/output/out.bc> as the input file, and I
cannot find any output any where. Also, if I donot use the "-o"
argument, the input is
</home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc> as
expected but still I cannot find the output (the resultant bitcode).
What should I do?
I am expecting for your reply. Thank you very much.
Best Regards,Andy
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Hi Andy,
> I want to write a piece of code to instrument c++ programs. I have finished
> writing the pass, but I do not know how to get the resultant bitcode
>
> I ran OPT with the following arguments:
>
> opt -basiccg -basicaa -load /home/andy/llvm-3.0.src/Release/lib/InstTest.so
> -InstTest
</home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc>
> -o=</home/andy/output/out.bc> /dev/null
are you really using "<" and ">" here, or were they
just for emphasis?  The
shell interprets "<" and ">" as input and output
redirectors so you will get
strange behaviour if you use them like this.  Also, there is no need to use
an equals sign "=" after -o, it can just be "-o
/home/andy/output/out.bc".
Finally, why did you put /dev/null?

Anyway, try this:

opt -basiccg -basicaa -load /home/andy/llvm-3.0.src/Release/lib/InstTest.so 
-InstTest /home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc -o 
/home/andy/output/out.bc

Ciao, Duncan.
>
> where
</home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc> is the
> input file, and </home/andy/output/out.bc> is the expected output
file. InstTest
> is my pass.
>
> However, opt treat </home/andy/output/out.bc> as the input file, and
I cannot
> find any output any where. Also, if I donot use the "-o"
argument, the input is
> </home/andy/llvm-3.0.src/workspace/threadTest/Debug/threadTest.bc> as
expected
> but still I cannot find the output (the resultant bitcode).
>
> What should I do?
>
> I am expecting for your reply. Thank you very much.
>
> Best Regards,
> Andy
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Hi,
I am currently using llvm to compile memcache to get the bitcode. I simply
change all the "gcc -c" command to "clang -emit-llvm -c",
and output ".o" to ".bc". And all gcc link command to
llvm-ld. By these means, I successfully get the bitcode file, but when I run it
using "lli", it fails with the error:
UNREACHABLE executed!0 lli 0x087c2cabStack dump:0. Program arguments lli
timedrun.bc1. Running Pass 'X86 Machine Code Emitter' on function
@mainaborted
I encountered the same error when executing other executables in the project.
Why does this happen? Is there any suggestions to get rid of such problem? 
Thank you
BestAndy
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Hi Andy,
> I am currently using llvm to compile memcache to get the bitcode. I simply
> change all the "gcc -c" command to "clang -emit-llvm
-c", and output ".o" to
> ".bc". And all gcc link command to llvm-ld. By these means, I
successfully get
> the bitcode file, but when I run it using "lli", it fails with
the error:
>
> UNREACHABLE executed!
> 0 lli 0x087c2cab
> Stack dump:
> 0. Program arguments lli timedrun.bc
> 1. Running Pass 'X86 Machine Code Emitter' on function @main
> aborted
>
> I encountered the same error when executing other executables in the
project.
> Why does this happen? Is there any suggestions to get rid of such problem?
this probably means that the bitcode contains something that is not supported
by lli, such as inline assembler.  Try passing the -use-mcjit option to lli.
If that doesn't work, feel free to open a bugreport and attach the bitcode.

Ciao, Duncan.