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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang crashes when running user defined LLVM pass with -xclang flag"
href="http://llvm.org/bugs/show_bug.cgi?id=20353">20353</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang crashes when running user defined LLVM pass with -xclang flag
</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>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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>windxing2007@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This bug appears when using clang to compile a hello world program as below.
#include <stdio.h>
void main()
{
printf("hello world\n");
}
The pass loaded to clang is a simple pass which have the following two lines of
code:
1----Type * ShortTy = IntegerType::get(M.getContext(), 16);
2----PointerType * Ptr16Ty = PointerType::getUnqual(ShortTy);
If line 2 is removed, then clang won't crash. I'm not sure whether it crashes
because line 2 has error. If it is an error of line 2, please let me know.
The pass is loaded using the command as below:
clang -Xclang -load -Xclang
/home/jun/llvm-3.x/build/Debug+Asserts/lib/LLVMInst.so test.c -o test
The backtrace is as below:
0 clang 0x0000000002e19847 llvm::sys::PrintStackTrace(_IO_FILE*) +
38
1 clang 0x0000000002e19ace
2 clang 0x0000000002e19512
3 libpthread.so.0 0x00007ff04cc13cb0
4 clang 0x0000000002dae406 llvm::PointerType::get(llvm::Type*,
unsigned int) + 118
5 LLVMInst.so 0x00007ff04d03a6c2
6 LLVMInst.so 0x00007ff04d038dca
7 clang 0x0000000002d908c4
llvm::FPPassManager::runOnFunction(llvm::Function&) + 390
8 clang 0x0000000002d90605
llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&) + 89
9 clang 0x0000000002d901cc
llvm::legacy::FunctionPassManager::run(llvm::Function&) + 180
10 clang 0x0000000000f1875b
11 clang 0x0000000000f18917
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 136
12 clang 0x0000000000f1428e
13 clang 0x00000000011240d8 clang::ParseAST(clang::Sema&, bool, bool)
+ 776
14 clang 0x0000000000cbe96f clang::ASTFrontendAction::ExecuteAction()
+ 321
15 clang 0x0000000000f13724 clang::CodeGenAction::ExecuteAction() +
1414
16 clang 0x0000000000cbe4ae clang::FrontendAction::Execute() + 200
17 clang 0x0000000000c8fd44
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 720
18 clang 0x0000000000c5e63a
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1018
19 clang 0x0000000000c4f572 cc1_main(char const**, char const**, char
const*, void*) + 717
20 clang 0x0000000000c59d0a main + 786
21 libc.so.6 0x00007ff04be4f76d __libc_start_main + 237
22 clang 0x0000000000c4ec69
Stack dump:
0. Program arguments: /usr/local/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
test.c -mrelocation-model static -mdisable-fp-elim -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version
2.22 -resource-dir /usr/local/bin/../lib/clang/3.5 -internal-isystem
/usr/local/include -internal-isystem /usr/local/bin/../lib/clang/3.5/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/jun/straight-DTA/test -ferror-limit 19
-fmessage-length 171 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -vectorize-slp -load
/home/jun/llvm-3.x/build/Debug+Asserts/lib/LLVMInst.so -o /tmp/test-f83ffb.o -x
c test.c
1. <eof> parser at end of file
2. Per-function optimization
3. Running pass 'instrument every basic block' on function '@main'
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.5 (trunk 196464) (llvm/trunk 196460)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:</pre>
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