[LLVMbugs] [Bug 12473] New: Assertion `use_empty() && "Uses remain when a value is destroyed!"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12473

             Bug #: 12473
           Summary: Assertion `use_empty() && "Uses remain when a value is
                    destroyed!"' failed.
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: chenyang at cs.utah.edu, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


[regehr at dyson r9]$ clang -c -O3 small.c
small.c:15:19: warning: expression result unused [-Wunused-value]
    b || a >> b ? 0 : 0 << b;
                  ^        ~
While deleting: i8* %
Use still stuck around after Def is destroyed:  call void
@llvm.lifetime.end(i64 -1, i8* <badref>)
clang: Value.cpp:75: virtual llvm::Value::~Value(): Assertion `use_empty() &&
"Uses remain when a value is destroyed!"' failed.
0  clang           0x0000000001e405cf
1  clang           0x0000000001e42552
2  libpthread.so.0 0x00007ffff7bcf8f0
3  libc.so.6       0x00007ffff6ebea75 gsignal + 53
4  libc.so.6       0x00007ffff6ec25c0 abort + 384
5  libc.so.6       0x00007ffff6eb7941 __assert_fail + 241
6  clang           0x0000000001deea2f
7  clang           0x0000000001dc12f7
8  clang           0x0000000001b49895 llvm::InlineFunction(llvm::CallSite,
llvm::InlineFunctionInfo&, bool) + 7301
9  clang           0x00000000012a825d
10 clang           0x00000000012a9b7f
llvm::Inliner::runOnSCC(llvm::CallGraphSCC&) + 3247
11 clang           0x0000000001b8fa0a
12 clang           0x0000000001ddc171
llvm::MPPassManager::runOnModule(llvm::Module&) + 497
13 clang           0x0000000001ddc2eb llvm::PassManagerImpl::run(llvm::Module&)
+ 171
14 clang           0x00000000007b69f1
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 1457
15 clang           0x00000000007b4009
16 clang           0x0000000000913f71 clang::ParseAST(clang::Sema&, bool) + 465
17 clang           0x00000000007b2a14 clang::CodeGenAction::ExecuteAction() +
68
18 clang           0x000000000065ce51
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 321
19 clang           0x00000000006460b4
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1348
20 clang           0x000000000063bf80 cc1_main(char const**, char const**, char
const*, void*) + 944
21 clang           0x0000000000644eb9 main + 7241
22 libc.so.6       0x00007ffff6ea9c4d __libc_start_main + 253
23 clang           0x0000000000639a09
Stack dump:
0.    Program arguments:
/uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r154095-install/bin/clang
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name
small.c -mrelocation-model static -masm-verbose -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -momit-leaf-frame-pointer -coverage-file
small.o -resource-dir
/uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r154095-install/bin/../lib/clang/3.1
-fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem
/usr/local/include -internal-isystem
/uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r154095-install/bin/../lib/clang/3.1/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O3
-fdebug-compilation-dir /home/regehr/z/reduce/r9 -ferror-limit 19
-fmessage-length 93 -mstackrealign -fgnu-runtime -fobjc-runtime-has-arc
-fobjc-runtime-has-weak -fobjc-fragile-abi -fdiagnostics-show-option
-fcolor-diagnostics -o small.o -x c small.c 
1.    <eof> parser at end of file
2.    Per-module optimization passes
3.    Running pass 'CallGraph Pass Manager' on module 'small.c'.
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang: note: diagnostic msg: Please submit a bug report to
http://llvm.org/bugs/ and include command line arguments and all diagnostic
information.
clang: note: diagnostic msg: Preprocessed source(s) and associated run
script(s) are located at:
clang: note: diagnostic msg: /tmp/small-7Wp4uf.i
clang: note: diagnostic msg: /tmp/small-7Wp4uf.sh
[regehr at dyson r9]$ cat small.c
int a, b, c, d, e;
short fn1 (unsigned short);
void
fn2 () {
  fn1 (1);
}
short
fn1 (unsigned short p1) {
  if (p1) {
    int f[4];
    f[e] = 0;
    f[0] = c = p1;
  }
  if (c) {
    b || a >> b ? 0 : 0 << b;
    return 0;
  }
  return d;
}
[regehr at dyson r9]$ clang -v
clang version 3.1 (trunk 154095)
Target: x86_64-unknown-linux-gnu
Thread model: posix

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