https://llvm.org/bugs/show_bug.cgi?id=28172
Bug ID: 28172
Summary: clang crashes on invalid code (with too few arguments
to __builtin_signbit) without any proper diagnostics
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 and 3.8.x crashes when compiling the following
(invalid) code in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from 3.7.x.
$ clang -v
clang version 3.9.0 (trunk 272993)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/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-3.7 -c small.c
small.c:3:22: error: too few arguments to function call, expected 1, have 0
__builtin_signbit ();
~~~~~~~~~~~~~~~~~ ^
1 error generated.
$
$ clang -c small.c
small.c:3:3: warning: ignoring return value of function declared with const
attribute [-Wunused-value]
__builtin_signbit ();
^~~~~~~~~~~~~~~~~
clang-3.9:
/tmp/llvm-builder/llvm-source-trunk/tools/clang/include/clang/AST/Expr.h:2218:
const clang::Expr* clang::CallExpr::getArg(unsigned int) const: Assertion `Arg
< NumArgs && "Arg access out of range!"' failed.
#0 0x0000000001d1b425 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1d1b425)
#1 0x0000000001d192b6 llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-3.9+0x1d192b6)
#2 0x0000000001d194d4 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-3.9+0x1d194d4)
#3 0x00007fb0bf48d340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x00007fb0be6abcc9 gsignal
/build/eglibc-3GlaMS/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007fb0be6af0d8 abort
/build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007fb0be6a4b86 __assert_fail_base
/build/eglibc-3GlaMS/eglibc-2.19/assert/assert.c:92:0
#7 0x00007fb0be6a4c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x000000000089907e llvm::isa_impl_cl<clang::ImplicitCastExpr, clang::Expr
const*>::doit(clang::Expr const*) [clone .part.414]
(/usr/local/clang-trunk/bin/clang-3.9+0x89907e)
#9 0x00000000020a8ac9 (/usr/local/clang-trunk/bin/clang-3.9+0x20a8ac9)
#10 0x00000000020d0872
clang::CodeGen::CodeGenFunction::EmitBuiltinExpr(clang::FunctionDecl const*,
unsigned int, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot)
(/usr/local/clang-trunk/bin/clang-3.9+0x20d0872)
#11 0x0000000002000220
clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*,
clang::CodeGen::ReturnValueSlot)
(/usr/local/clang-trunk/bin/clang-3.9+0x2000220)
#12 0x00000000008908f0 (anonymous
namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*)
(/usr/local/clang-trunk/bin/clang-3.9+0x8908f0)
#13 0x0000000002026c13 (anonymous
namespace)::ScalarExprEmitter::Visit(clang::Expr*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2026c13)
#14 0x0000000002027333
clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x2027333)
#15 0x0000000001fef44f clang::CodeGen::CodeGenFunction::EmitAnyExpr(clang::Expr
const*, clang::CodeGen::AggValueSlot, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x1fef44f)
#16 0x0000000002000bdd
clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*)
(/usr/local/clang-trunk/bin/clang-3.9+0x2000bdd)
#17 0x0000000001eaa6ec clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt
const*) (/usr/local/clang-trunk/bin/clang-3.9+0x1eaa6ec)
#18 0x0000000001eab3df
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
(/usr/local/clang-trunk/bin/clang-3.9+0x1eab3df)
#19 0x0000000001ed12f2
clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::CodeGen::FunctionArgList&,
clang::Stmt const*) (/usr/local/clang-trunk/bin/clang-3.9+0x1ed12f2)
#20 0x0000000001edba4e
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&)
(/usr/local/clang-trunk/bin/clang-3.9+0x1edba4e)
#21 0x0000000001efcc21
clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/usr/local/clang-trunk/bin/clang-3.9+0x1efcc21)
#22 0x0000000001f0d381
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/usr/local/clang-trunk/bin/clang-3.9+0x1f0d381)
#23 0x0000000001f0e299
clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl)
(/usr/local/clang-trunk/bin/clang-3.9+0x1f0e299)
#24 0x0000000001f0e96d
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) [clone
.part.6217] (/usr/local/clang-trunk/bin/clang-3.9+0x1f0e96d)
#25 0x000000000248b97b (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef)
(/usr/local/clang-trunk/bin/clang-3.9+0x248b97b)
#26 0x000000000248628c
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef)
(/usr/local/clang-trunk/bin/clang-3.9+0x248628c)
#27 0x00000000027f0676 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-3.9+0x27f0676)
#28 0x0000000002486d3e clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-3.9+0x2486d3e)
#29 0x00000000021977fe clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-3.9+0x21977fe)
#30 0x000000000216d266
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-3.9+0x216d266)
#31 0x00000000022245c2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-3.9+0x22245c2)
#32 0x0000000000af0548 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-3.9+0xaf0548)
#33 0x0000000000aa46dc main (/usr/local/clang-trunk/bin/clang-3.9+0xaa46dc)
#34 0x00007fb0be696ec5 __libc_start_main
/build/eglibc-3GlaMS/eglibc-2.19/csu/libc-start.c:321:0
#35 0x0000000000aec5b4 _start (/usr/local/clang-trunk/bin/clang-3.9+0xaec5b4)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
small.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -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
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdebug-compilation-dir /data2/
-ferror-limit 19 -fmessage-length 226 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -o small.o -x c small.c
1. <eof> parser at end of file
2. small.c:1:6: LLVM IR generation of declaration 'foo'
3. small.c:1:6: Generating code for declaration 'foo'
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 272993)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/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-b8a809.c
clang-3.9: note: diagnostic msg: /tmp/small-b8a809.sh
clang-3.9: note: diagnostic msg:
********************
$
----------------------------
void foo ()
{
__builtin_signbit ();
}
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