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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Emit a warning if inline assembly with a clobber list is used inside a naked function."
href="https://llvm.org/bugs/show_bug.cgi?id=28641">28641</a>
</td>
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<th>Summary</th>
<td>Emit a warning if inline assembly with a clobber list is used inside a naked function.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<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, paul_robinson@playstation.sony.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Having inline assembly with a clobber list in a function marked naked seems
dangerous as this will alter the stack but only at -O0 in the case below,
higher optimisations level are fine.
eg:
$ clang --version
clang version 3.9.0 @r276109
Target: x86_64-unknown-linux-gnu
#include <stdlib.h>
__attribute__((__naked__, __noinline__)) int foo(size_t)
{
__asm__ __volatile__ (
"ret" : : : "rdi"
);
}
$ clang -O0 -S test.cpp
# BB#0: # %entry
movq %rdi, -16(%rbp) # 8-byte Spill <- Stack altered
#APP
retq
#NO_APP</pre>
</div>
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