[LLVMbugs] [Bug 17250] New: opt fails with blockaddress of entry block

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17250

            Bug ID: 17250
           Summary: opt fails with blockaddress of entry block
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: marceloabsousa at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11203
  --> http://llvm.org/bugs/attachment.cgi?id=11203&action=edit
Bytecode file

With:
LLVM (http://llvm.org/):
  LLVM version 3.4svn
  DEBUG build.
  Built Sep 14 2013 (21:22:42).
  Default target: x86_64-unknown-linux-gnu
  Host CPU: corei7-avx

clang version 3.4 (trunk 190758)
Target: x86_64-unknown-linux-gnu
Thread model: posix

Running the optimizer with instnamer and lowerswitch violates the blockaddress
of entry block assertion. This file is part of the Linux kernel
(lib/locking-selftest.c). I'm able to run llvm-dis on it for inspection. I
suspect the problem is in the IR generation. Here's the failure log file. The
.bc goes in attach.

opt -instnamer < locking-selftest.c.bc > locking-selftest.o.bc

blockaddress may not be used with the entry block!
label %bb
Broken module found, compilation aborted!
/home/msousa/llvm/build/bin/opt -instnamer -lowerswitch < lib/show_mem.c.bc >
lib/show_mem.o.bc
/home/msousa/llvm/build/bin/opt -instnamer -lowerswitch < lib/proportions.c.bc
> lib/proportions.o.bc
0  opt             0x00000000018a5a15 llvm::sys::PrintStackTrace(_IO_FILE*) +
38
1  opt             0x00000000018a5c9c
/home/msousa/llvm/build/bin/opt -instnamer -lowerswitch < lib/rwsem.c.bc >
lib/rwsem.o.bc
2  opt             0x00000000018a56e0
3  libpthread.so.0 0x00002aaaab311030
4  libc.so.6       0x00002aaaabf06475 gsignal + 53
5  libc.so.6       0x00002aaaabf096f0 abort + 384
6  opt             0x000000000179be27
7  opt             0x000000000179bb0b
8  opt             0x000000000177d7cd
llvm::FPPassManager::runOnFunction(llvm::Function&) + 385
9  opt             0x000000000177d9be
llvm::FPPassManager::runOnModule(llvm::Module&) + 84
10 opt             0x000000000177dd1b
llvm::MPPassManager::runOnModule(llvm::Module&) + 559
11 opt             0x000000000177e269 llvm::PassManagerImpl::run(llvm::Module&)
+ 249
12 opt             0x000000000177e47b llvm::PassManager::run(llvm::Module&) +
39
13 opt             0x000000000094a50f main + 5564
14 libc.so.6       0x00002aaaabef2ead __libc_start_main + 253
15 opt             0x000000000093cd99
Stack dump:
0.      Program arguments: opt -instnamer -lowerswitch
1.      Running pass 'Function Pass Manager' on module '<stdin>'.
2.      Running pass 'Module Verifier' on function
'@ww_test_object_lock_unbalanced'
Aborted
make: *** [lib/locking-selftest.o.bc] Error 134

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