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<head>
<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ICE on valid code: UNREACHABLE executed at llvm-project/clang/lib/CodeGen/CGExpr.cpp, __attribute__((naked))"
href="https://bugs.llvm.org/show_bug.cgi?id=51197">51197</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ICE on valid code: UNREACHABLE executed at llvm-project/clang/lib/CodeGen/CGExpr.cpp, __attribute__((naked))
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cnsun@uwaterloo.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>$ clang-trunk -v
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
ab5ac659c81a453a3f58df94f39fe8ba3cd35918)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ cat mutant.c
__attribute__((naked)) foo(int len, char[len]) {}
$ clang-trunk mutant.c
mutant.c:1:24: warning: type specifier missing, defaults to 'int'
[-Wimplicit-int]
__attribute__((naked)) foo(int len, char[len]) {}
^
mutant.c:1:41: warning: omitting the parameter name in a function definition is
a C2x extension [-Wc2x-extensions]
__attribute__((naked)) foo(int len, char[len]) {}
^
DeclRefExpr for Decl not entered in LocalDeclMap?
UNREACHABLE executed at
/tmp/tmp.Gcp8nSn9Hr-clang-builder/llvm-project/clang/lib/CodeGen/CGExpr.cpp:2794!
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /scratch/software/clang-trunk/bin/clang-13 -cc1
-triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations
-disable-free -main-file-name mutant.c -mrelocation-model static
-mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb
-fcoverage-compilation-dir=/scratch/cnsun/workspace/perses-fuzzer/temp_testing_campaigns/default_finding_folder_c/crash_20210707_101723_1c32/delta/perses_result
-resource-dir /scratch/software/clang-trunk/lib/clang/13.0.0 -c-isystem .
-c-isystem /usr/local/include/cmsith -internal-isystem
/scratch/software/clang-trunk/lib/clang/13.0.0/include -internal-isystem
/usr/local/include -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir=/scratch/cnsun/workspace/perses-fuzzer/temp_testing_campaigns/default_finding_folder_c/crash_20210707_101723_1c32/delta/perses_result
-ferror-limit 19 -fgnuc-version=4.2.1 -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1
-o /tmp/mutant-8f3361.o -x c mutant.c
1. <eof> parser at end of file
2. mutant.c:1:24: LLVM IR generation of declaration 'foo'
3. mutant.c:1:24: Generating code for declaration 'foo'
#0 0x000055bbe2b60754 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x000055bbe2b5de6e SignalHandler(int) Signals.cpp:0:0
#2 0x00007fd9c1a1d3c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
#3 0x00007fd9c14bc18b raise
/build/glibc-ZN95T4/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
#4 0x00007fd9c149b859 abort /build/glibc-ZN95T4/glibc-2.31/stdlib/abort.c:81:7
#5 0x000055bbe2aaa94e (/scratch/software/clang-trunk/bin/clang-13+0x3a6f94e)
#6 0x000055bbe3228da8
clang::CodeGen::CodeGenFunction::EmitDeclRefLValue(clang::DeclRefExpr const*)
(/scratch/software/clang-trunk/bin/clang-13+0x41edda8)
#7 0x000055bbe3223ee9 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr
const*) (/scratch/software/clang-trunk/bin/clang-13+0x41e8ee9)
#8 0x000055bbe322e5fc
clang::CodeGen::CodeGenFunction::EmitCheckedLValue(clang::Expr const*,
clang::CodeGen::CodeGenFunction::TypeCheckKind)
(/scratch/software/clang-trunk/bin/clang-13+0x41f35fc)
#9 0x000055bbe3269e21 (anonymous
namespace)::ScalarExprEmitter::EmitLoadOfLValue(clang::Expr const*)
CGExprScalar.cpp:0:0
#10 0x000055bbe3269454 (anonymous
namespace)::ScalarExprEmitter::Visit(clang::Expr*) CGExprScalar.cpp:0:0
#11 0x000055bbe326fd53 (anonymous
namespace)::ScalarExprEmitter::VisitCastExpr(clang::CastExpr*)
CGExprScalar.cpp:0:0
#12 0x000055bbe32677ce (anonymous
namespace)::ScalarExprEmitter::Visit(clang::Expr*) CGExprScalar.cpp:0:0
#13 0x000055bbe326982a
clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool)
(/scratch/software/clang-trunk/bin/clang-13+0x422e82a)
#14 0x000055bbe2f63eec
clang::CodeGen::CodeGenFunction::EmitVariablyModifiedType(clang::QualType)
(/scratch/software/clang-trunk/bin/clang-13+0x3f28eec)
#15 0x000055bbe2f660ec
clang::CodeGen::CodeGenFunction::StartFunction(clang::GlobalDecl,
clang::QualType, llvm::Function*, clang::CodeGen::CGFunctionInfo const&,
clang::CodeGen::FunctionArgList const&, clang::SourceLocation,
clang::SourceLocation) (/scratch/software/clang-trunk/bin/clang-13+0x3f2b0ec)
#16 0x000055bbe2f6ae3f
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&)
(/scratch/software/clang-trunk/bin/clang-13+0x3f2fe3f)
#17 0x000055bbe2fc54c6
clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/scratch/software/clang-trunk/bin/clang-13+0x3f8a4c6)
#18 0x000055bbe2fc0f35
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/scratch/software/clang-trunk/bin/clang-13+0x3f85f35)
#19 0x000055bbe2fc139b
clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl)
(/scratch/software/clang-trunk/bin/clang-13+0x3f8639b)
#20 0x000055bbe2fc9eb2
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0)
CodeGenModule.cpp:0:0
#21 0x000055bbe3cf6179 (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef)
ModuleBuilder.cpp:0:0
#22 0x000055bbe3ce8380
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef)
(/scratch/software/clang-trunk/bin/clang-13+0x4cad380)
#23 0x000055bbe4db8d34 clang::ParseAST(clang::Sema&, bool, bool)
(/scratch/software/clang-trunk/bin/clang-13+0x5d7dd34)
#24 0x000055bbe3cf32f8 clang::CodeGenAction::ExecuteAction()
(/scratch/software/clang-trunk/bin/clang-13+0x4cb82f8)
#25 0x000055bbe3591419 clang::FrontendAction::Execute()
(/scratch/software/clang-trunk/bin/clang-13+0x4556419)
#26 0x000055bbe352707e
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/scratch/software/clang-trunk/bin/clang-13+0x44ec07e)
#27 0x000055bbe366f710
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/scratch/software/clang-trunk/bin/clang-13+0x4634710)
#28 0x000055bbe03db15d cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/scratch/software/clang-trunk/bin/clang-13+0x13a015d)
#29 0x000055bbe03d74a8 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#30 0x000055bbe0302126 main
(/scratch/software/clang-trunk/bin/clang-13+0x12c7126)
#31 0x00007fd9c149d0b3 __libc_start_main
/build/glibc-ZN95T4/glibc-2.31/csu/../csu/libc-start.c:342:3
#32 0x000055bbe03d701e _start
(/scratch/software/clang-trunk/bin/clang-13+0x139c01e)
clang-13: error: unable to execute command: Aborted (core dumped)
clang-13: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
ab5ac659c81a453a3f58df94f39fe8ba3cd35918)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
clang-13: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/mutant-c1dca7.c
clang-13: note: diagnostic msg: /tmp/mutant-c1dca7.sh
clang-13: note: diagnostic msg:
********************</pre>
</div>
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