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<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Undiagnosed implementation limit of 127 nested function prototypes"
href="http://llvm.org/bugs/show_bug.cgi?id=19607">19607</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Undiagnosed implementation limit of 127 nested function prototypes
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>david.majnemer@gmail.com, llvmbugs@cs.uiuc.edu, rjmccall@apple.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>ParmVarDecl::setScopeInfo() is defined like so:
void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex) {
assert(!ParmVarDeclBits.IsObjCMethodParam);
ParmVarDeclBits.ScopeDepthOrObjCQuals = scopeDepth;
assert(ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth
&& "truncation!");
setParameterIndex(parameterIndex);
}
It's possible to construct a program that trips this assertion by creating a
deeply nested function prototype:
void foo(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void (*f)(void
(*f)(void (*f)(void (*f)(void
(*f)()))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))));
Assertion failed: ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth &&
"truncation!", file ..\tools\clang\include\clang/AST/Decl.h, line 1276
I wanted one more bit in VarDeclBits.TSCSpec, so I considered taking it from
here. However, I discovered we don't enforce an upper bound on this quantity.</pre>
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