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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - type_tag_for_datatype causes clang to crash in some cases."
href="https://llvm.org/bugs/show_bug.cgi?id=28520">28520</a>
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<th>Summary</th>
<td>type_tag_for_datatype causes clang to crash in some cases.
</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>
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<th>OS</th>
<td>All
</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>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pierregousseau14@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Use of type_tag_for_datatype causes clang to crash in some cases.
clang 3.9 trunk@r275160
Target: x86_64-unknown-linux-gnu
----
static const int test_void
__attribute__((type_tag_for_datatype
(test, void))) = 0;
#define TEST_VOID 0
void test(int datatype, ...)
__attribute__((argument_with_type_tag(test,2,1)));
int main() {
test(TEST_VOID);
return 0;
}
----
clang -c test.c
#0 0x000000000129a165 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
#1 0x00000000012980ce llvm::sys::RunSignalHandlers()
#2 0x0000000001298232 SignalHandler(int)
#3 0x00007fb061f86340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x0000000001f4caba
clang::Sema::CheckArgumentWithTypeTag(clang::ArgumentWithTypeTagAttr const*,
clang::Expr const* const*)
...
Stack dump:
0. Program arguments: clang-3.9 -cc1 -triple x86_64-unknown-linux-gnu
-emit-obj -mrelax-all -disable-free -main-file-name tag.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 lab/tag.c -resource-dir
llvm/install/bin/../lib/clang/3.9.0 -internal-isystem /usr/local/include
-internal-isystem llvm/install/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 lab -ferror-limit 19 -fmessage-length 168
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o tag.o -x c
tag.c
1. tag.c:10:17: current parser token ')'
2. tag.c:9:12: parsing function body 'main'
3. tag.c:9:12: in compound statement ('{}')</pre>
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