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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - IR parsing of floating-point constants is locale-dependent"
href="https://llvm.org/bugs/show_bug.cgi?id=25788">25788</a>
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<th>Summary</th>
<td>IR parsing of floating-point constants is locale-dependent
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>3.6
</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
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM assembly language parser
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>pitrou@free.fr
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Parsing of floating-point constants in decimal notation is locale-dependent.
With a locale other than C, a bogus value may be emitted. This was observed
with LLVM 3.6 but inspection of trunk suggests the issue hasn't been corrected,
as it seems due to the use of std::atof() in lib/AsmParser/LLLexer.cpp.
Not only atof() is locale-dependent, but it's quite lenient. So if for instance
you pass it "1.23e+01" and the current locale has the comma (",") as decimal
separator, atof() simply ignores the invalid trailing characters and returns
1.0.
I have a small reproducer using the llvmlite bindings below (I don't seem to be
able to reproduce using the LLVM command-line tools, perhaps because they force
the locale to "C"). It parses the IR and prints out the IR of the parsed
module:
```
import locale
import llvmlite.binding as llvm
ir = """
define double @func()
{
ret double 1.23e+01
}
"""
locale.setlocale(locale.LC_ALL, ("fr_FR", "UTF-8"))
llvm.initialize()
llvm.initialize_native_target()
llvm.initialize_native_asmprinter()
mod = llvm.parse_assembly(ir)
print(mod) # => the printed assembly returns 1.0, not 12.3...
```
Probably a similar reproducer can be written using the C++ API.</pre>
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