llvm dev - Jun 2010 - [LLVMdev] can't run the Hello Pass: either not registered or registered multiple times, what is the problem?

I am trying to run the HELLO LLVM Pass under WinXP/MinGW, by following 
the precise steps available at 
http://www.llvm.org/docs/WritingAnLLVMPass.html.
The pass failed to run, giving me the following error:

opt -load Release/lib/Hello.dll -hello < ./hello.bc > /dev/null
opt.exe: Unknown command line argument '-hello'.  Try: 
'C:\MSYS\opt\llvm-2.7\bin\opt.exe -help'
make: *** [run] Error 1

Basically, it can't find the hello pass.

However, when I was trying to run the same code under Debian4-i386, I 
got a totally opposite error: "Passes registered multiple times"
opt -load Release/lib/Hello.so -hello < test.bc > /dev/null
opt: 
/autofs/steffan/a/a0/czhao/ResearchTools/LLVM/2.7/llvm-2.7/lib/VMCore/Pass.cpp:234:
void<unnamed>::PassRegistrar::RegisterPass(const llvm::PassInfo&): 
Assertion `Inserted && "Pass registered multiple times!"'
failed.
0  opt 0x085e6809
Stack dump:
0.    Program arguments: opt -load Release/lib/Hello.so -hello
/bin/sh: line 1: 28292 Aborted                 opt -load 
Release/lib/Hello.so -hello <test.bc >/dev/null
make: *** [run] Error 134


I think there is something very tricky here, but I can't figure out where.

Could somebody give me a hint?


Thank you

Chuck

Hello
> opt -load Release/lib/Hello.dll -hello < ./hello.bc > /dev/null
> opt.exe: Unknown command line argument '-hello'.  Try:
>
> Could somebody give me a hint?
Loadable modules (e.g. passes) are not supported on windows. And will
probably never be.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Anton Korobeynikov wrote:
> Hello
>
>   
>> opt -load Release/lib/Hello.dll -hello < ./hello.bc > /dev/null
>> opt.exe: Unknown command line argument '-hello'.  Try:
>>
>> Could somebody give me a hint?
>>     
> Loadable modules (e.g. passes) are not supported on windows. And will
> probably never be.
>
>   
As an alternative, you can either:

1) Modify the opt program to statically link in the library implementing 
your pass.
2) Create a new program (based on opt) that runs your pass on a 
specified bitcode file.

SAFECode has done the latter; you can see what we did by checkout out 
the SAFECode source code 
(http://safecode.cs.illinois.edu/downloads.html) and looking at 
tools/Sc/sc.cpp.

-- John T.

Anton and John,

Thank you for the valuable info.

I guess the MinGW/Cygwin path is dead, at least for now.

How about the problem of registering the pass multiple times under Linux 
(Debian4-i386)?

opt -load Release/lib/Hello.so -hello < test.bc > /dev/null
opt: 
/autofs/steffan/a/a0/czhao/ResearchTools/LLVM/2.7/llvm-2.7/lib/VMCore/Pass.cpp:234:
void<unnamed>::PassRegistrar::RegisterPass(const llvm::PassInfo&): 
Assertion `Inserted && "Pass registered multiple times!"'
failed.
0  opt 0x085e6809
Stack dump:
0.    Program arguments: opt -load Release/lib/Hello.so -hello
/bin/sh: line 1: 28292 Aborted                 opt -load 
Release/lib/Hello.so -hello <test.bc >/dev/null
make: *** [run] Error 134

I can't seem to figure out the reason of the strange behavior, other 
than believing it is (possibly) a mis-compilation problem.

A few known-to-miscompile compiler versions are given in the getting 
started guide (http://llvm.org/docs/GettingStarted.html), I wonder if 
the LLVM Team can publish instead at least 1 GOOD build compiler (the 
version) on a supported platform, in addition to the broken ones.

And, is there a way to check whether a current LLVM build is miscompiled 
or not, by running some simple tests or scripts?

Any suggestion(s)?

Thank you

Chuck



On 6/2/2010 5:28 PM, Anton Korobeynikov wrote:
> opt -load Release/lib/Hello.dll -hello < ./hello.bc > /dev/null
>> opt.exe: Unknown command line argument '-hello'.  Try:
>>
>> Could somebody give me a hint?
>>      
> Loadable modules (e.g. passes) are not supported on windows. And will
> probably never be.
>
>    
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