https://llvm.org/bugs/show_bug.cgi?id=27744
Bug ID: 27744
Summary: clang crashes on valid code at -Os and above in 32-bit
mode on x86_64-linux-gnu: Assertion `VRM->hasPhys(Reg)
&& "We have unallocated variable!!"' failed
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk crashes when compiling the following code on
x86_64-linux-gnu at -Os and above in the 32-bit mode (but not in the 64-bit
mode).
This is a regression from 3.8.x.
$ clang-trunk -v
clang version 3.9.0 (trunk 269398)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang-trunk -m32 -O1 -c small.c
$ clang-3.8 -m32 -Os -c small.c
$
$ clang-trunk -m32 -Os -c small.c
clang-3.9:
/tmp/llvm-builder/llvm-source-trunk/lib/CodeGen/RegAllocGreedy.cpp:2382: void
{anonymous}::RAGreedy::tryHintRecoloring(llvm::LiveInterval&): Assertion
`VRM->hasPhys(Reg) && "We have unallocated variable!!"' failed.
#0 0x0000000001dd5245 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1dd5245)
#1 0x0000000001dd31d6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-3.9+0x1dd31d6)
#2 0x0000000001dd33f4 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-3.9+0x1dd33f4)
#3 0x00007fa50a776340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x00007fa509994cc9 gsignal
/build/eglibc-3GlaMS/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007fa5099980d8 abort
/build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007fa50998db86 __assert_fail_base
/build/eglibc-3GlaMS/eglibc-2.19/assert/assert.c:92:0
#7 0x00007fa50998dc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x0000000001964d5c (anonymous
namespace)::RAGreedy::tryHintRecoloring(llvm::LiveInterval&) [clone .isra.490]
(/usr/local/clang-trunk/bin/clang-3.9+0x1964d5c)
#9 0x00000000019681b2 (anonymous
namespace)::RAGreedy::runOnMachineFunction(llvm::MachineFunction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x19681b2)
#10 0x00000000017c5565
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-3.9+0x17c5565)
#11 0x0000000001a4a713 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1a4a713)
#12 0x0000000001a4ad5b llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1a4ad5b)
#13 0x0000000001f21bca clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang-3.9+0x1f21bca)
#14 0x0000000002552b5d
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-3.9+0x2552b5d)
#15 0x00000000028a2acd clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x28a2acd)
#16 0x0000000002552ebe clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x2552ebe)
#17 0x0000000002236d7e clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-3.9+0x2236d7e)
#18 0x000000000220dad6
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x220dad6)
#19 0x00000000022c17c2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-3.9+0x22c17c2)
#20 0x0000000000adc198 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-3.9+0xadc198)
#21 0x0000000000a962ae main (/usr/local/clang-trunk/bin/clang-3.9+0xa962ae)
#22 0x00007fa50997fec5 __libc_start_main
/build/eglibc-3GlaMS/eglibc-2.19/csu/libc-start.c:321:0
#23 0x0000000000ad8204 _start (/usr/local/clang-trunk/bin/clang-3.9+0xad8204)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -cc1 -triple
i386-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -fuse-init-array -target-cpu pentium4
-momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb
-coverage-file /data2/small.c -resource-dir
/usr/local/clang-trunk/bin/../lib/clang/3.9.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.9.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -Os -fdebug-compilation-dir
/data2 -ferror-limit 19 -fmessage-length 163 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o small.o -x c small.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'small.c'.
4. Running pass 'Greedy Register Allocator' on function '@fn1'
clang-3.9: error: unable to execute command: Aborted (core dumped)
clang-3.9: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 269398)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/small-48b868.c
clang-3.9: note: diagnostic msg: /tmp/small-48b868.sh
clang-3.9: note: diagnostic msg:
********************
$
------------------------------------------
int printf (const char *, ...);
int a, b, d;
char f;
struct S0
{
int f0:1;
int f1;
unsigned f2:6;
int:26;
int:1;
int f5:20;
int f6;
} h;
void
fn1 ()
{
struct S0 k = { 0, 0, 1, 1, 0 };
if (!d)
{
h = k;
d = (a ^ b) & -b ? a : a - b;
}
char l = f;
while (1)
{
a = -k.f2;
k.f2 = a;
if (h.f5)
f = k.f6 || l;
if (d)
{
struct S0 m = k = h;
a = m.f0;
}
printf ("0");
}
}
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