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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong getUBSanFunctionSignature for x32"
href="http://llvm.org/bugs/show_bug.cgi?id=22686">22686</a>
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<th>Summary</th>
<td>Wrong getUBSanFunctionSignature for x32
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>hjl.tools@gmail.com
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</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, michael.m.kuperstein@intel.com
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>lib/CodeGen/TargetInfo.cpp has:
llvm::Constant *
getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const override {
unsigned Sig = (0xeb << 0) | // jmp rel8
(0x0a << 8) | // .+0x0c
('F' << 16) |
('T' << 24);
return llvm::ConstantInt::get(CGM.Int32Ty, Sig);
}
But label is 4 bytes for x32. That is
.long _ZTIFvvE
vs.
.quad _ZTIFvvE
For x32, it should be
unsigned Sig = (0xeb << 0) | // jmp rel8
(0x06 << 8) | // .+0x08
('F' << 16) |
('T' << 24);</pre>
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