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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Implement vector deleting destructors"
href="http://llvm.org/bugs/show_bug.cgi?id=19398">19398</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Implement vector deleting destructors
</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>LLVM Codegen
</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, timurrrr@google.com
</td>
</tr>
<tr>
<th>Blocks</th>
<td>12477
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>MSVC supports an extension that allows users to delete an array of polymorphic
objects where the dynamic type doesn't match the static type of the array.
Here's an example of MSVC doing this where we can't:
$ cat t.cpp
extern "C" int printf(const char *, ...);
struct A {
A() : a(42) {}
virtual ~A() { printf("a: %d\n", a); }
int a;
};
struct B : A {
B() : b(13) {}
~B() { printf("b: %d\n", b); }
int b;
};
void foo(A *a) { delete[] a; }
int main() {
B *b = new B[2];
foo(b);
}
$ cl -nologo t.cpp && ./t.exe
t.cpp
b: 13
a: 42
b: 13
a: 42
$ clang-cl t.cpp && ./t.exe
a: 16699704
a: 42
They use "vector deleting destructors" to do this special array deletion, and
those are what go in the vftable. We currently put the scalar deleting dtor
there instead.</pre>
</div>
</p>
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