[LLVMdev] Optimized "opt" on Darwin fails to load dynamic libraries with passes

[Harel Cain]

I see now that this clearly to the problem raised elswhere, for example:

http://lists.cs.uiuc.edu/pipermail/llvmdev/2010-December/036764.html
http://lists.cs.uiuc.edu/pipermail/llvmdev/2010-November/036289.html

So clearly a repeating issue on the MacOS platform.


Harel

On Sun, Dec 12, 2010 at 5:10 PM, Harel Cain <harel.cain at gmail.com> wrote:

> Hi all,
>
> This is a problem that occurs for me only on Darwin (MacOS) and not on
> Linux.
>
> When llvm 2.8 (or 2.9) is compiled with ENABLE_OPTIMIZED=1, the "opt" tool
> fails to load LLVM passes in dynamic libraries (.dylib) files, regardless of
> how they themselves were built. When opt is built with ENABLE_OPTIMIZED=0,
> all is well.
>
> Here is some informative output. Seems to me the problem is in stripping
> the symbols of the assignPassManager virtual method from the various
> subclasses of llvm::Pass.
>
> Please advise!
>
>
> // the release version has all the necessary symbols in place before it is
> installed to /usr/local/bin
> $ nm -m Release+Asserts/bin/opt | grep assignPass
> 000000010042b7c0 (__TEXT,__text) external
> __ZN4llvm10ModulePass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001002a27c0 (__TEXT,__text) external
> __ZN4llvm10RegionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 000000010042b490 (__TEXT,__text) external
> __ZN4llvm12FunctionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 000000010042b260 (__TEXT,__text) external
> __ZN4llvm14BasicBlockPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001002053a0 (__TEXT,__text) external
> __ZN4llvm16CallGraphSCCPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001004223d0 (__TEXT,__text) weak external
> __ZN4llvm4Pass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 0000000100262120 (__TEXT,__text) external
> __ZN4llvm8LoopPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001004d7936 (__TEXT,__cstring) non-external
> __ZZN4llvm10ModulePass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004bcf42 (__TEXT,__cstring) non-external
> __ZZN4llvm10RegionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004d7924 (__TEXT,__cstring) non-external
> __ZZN4llvm12FunctionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004d7901 (__TEXT,__cstring) non-external
> __ZZN4llvm14BasicBlockPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004b404f (__TEXT,__cstring) non-external
> __ZZN4llvm16CallGraphSCCPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004b9ce0 (__TEXT,__cstring) non-external
> __ZZN4llvm8LoopPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
>
> // same is true for the debug build
> $ nm -m Debug+Asserts/bin/opt | grep assignPass
> 000000010040ea82 (__TEXT,__text) external
> __ZN4llvm10ModulePass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 0000000100299a82 (__TEXT,__text) external
> __ZN4llvm10RegionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 000000010040e8a0 (__TEXT,__text) external
> __ZN4llvm12FunctionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 000000010040e758 (__TEXT,__text) external
> __ZN4llvm14BasicBlockPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001001fcb5e (__TEXT,__text) external
> __ZN4llvm16CallGraphSCCPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001004093a8 (__TEXT,__text) weak external
> __ZN4llvm4Pass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 000000010025687e (__TEXT,__text) external
> __ZN4llvm8LoopPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
> 00000001004e349b (__TEXT,__cstring) non-external
> __ZZN4llvm10ModulePass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004c8414 (__TEXT,__cstring) non-external
> __ZZN4llvm10RegionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004e3489 (__TEXT,__cstring) non-external
> __ZZN4llvm12FunctionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004e3466 (__TEXT,__cstring) non-external
> __ZZN4llvm14BasicBlockPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004bf4e6 (__TEXT,__cstring) non-external
> __ZZN4llvm16CallGraphSCCPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
> 00000001004c5402 (__TEXT,__cstring) non-external
> __ZZN4llvm8LoopPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeEE8__func__
>
> // however, once it is installed with "make install" to /usr/local/bin,
> it's stripped of most of the relevant symbols (those of the llvm::Pass
> subclasses)
> $ nm -m /usr/local/bin/opt | grep assignPass
> 00000001004223d0 (__TEXT,__text) weak external
> __ZN4llvm4Pass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
>
> // my dynamic library contains a ModulePass, with a matching symbol that is
> missing in the installed "opt" binary
> $ nm -m /usr/local/lib/libMyPass.dylib | grep assignPass
>          (undefined) external
> __ZN4llvm10ModulePass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
>
> // and indeed, when opt tries to load it, it fails.
> $ opt -load /usr/local/lib/libMyPass.dylib
> Error opening '/usr/local/lib/libMyPass.dylib':
> dlopen(/usr/local/lib/libMyPass.dylib, 9): Symbol not found:
> __ZN4llvm10ModulePass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE
>   Referenced from: /usr/local/lib/libMyPass.dylib
>   Expected in: flat namespace
>  in /usr/local/lib/libMyPass.dylib
>   -load request ignored.
>
>
> Thanks a lot,
>
> Harel Cain
>
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