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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MacroArgs getNumArguments() yields unexpected results: Twice the expected amount"
href="https://llvm.org/bugs/show_bug.cgi?id=31814">31814</a>
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<th>Summary</th>
<td>MacroArgs getNumArguments() yields unexpected results: Twice the expected amount
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>3.9
</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>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>sebald.ziegler.maillist@ikolus.de
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17918" name="attach_17918" title="clang tool - which applied on the above example results in 4 instead of 2">attachment 17918</a> <a href="attachment.cgi?id=17918&action=edit" title="clang tool - which applied on the above example results in 4 instead of 2">[details]</a></span>
clang tool - which applied on the above example results in 4 instead of 2
Context: Writing a new clang tool
When using MacroArgs in this context:
void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
SourceRange Range, const MacroArgs *Args) {
...
}
to iterate over all macro arguments, Args->getNumArguments() yields twice the
expected amount of arguments. When trying to access the additional ones then
the program segfaults.
For this example:
#define MAX(x,y) ((x>y)?x:y)
int main(int argc, char** argv) {
int a=5;
int b=7;
return MAX(a,b);
}
Args->getNumArguments() is 4.
This does not seem to be intended behaviour. Or am I mistaken?</pre>
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