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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Calling array new with a negative size should be checked in C++14 mode"
href="https://bugs.llvm.org/show_bug.cgi?id=35573">35573</a>
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<th>Summary</th>
<td>Calling array new with a negative size should be checked in C++14 mode
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</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>C++14
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>t.p.northover@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>When emitting code for a new array expression we check whether the array size
is negative in C++98 and C++11 mode, but not from C++14 onwards. E.g.
char *foo(int a) {
return new char[a];
}
$ clang++ tmp.cpp -std=c++11 -S -o- -emit-llvm -Os
define noalias nonnull i8* @_Z3fooi(i32 %a) local_unnamed_addr #0 {
entry:
%0 = sext i32 %a to i64
%1 = icmp sgt i64 %0, -1
%2 = select i1 %1, i64 %0, i64 -1
%call = tail call i8* @_Znam(i64 %2) #2
ret i8* %call
}
$ clang++ tmp.cpp -std=c++14 -S -o- -emit-llvm -Os
define noalias nonnull i8* @_Z3fooi(i32 %a) local_unnamed_addr #0 {
entry:
%conv = sext i32 %a to i64
%call = tail call i8* @_Znam(i64 %conv) #2
ret i8* %call
}</pre>
</div>
</p>
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