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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - `final` does not cause devirtualization of nested calls"
href="https://bugs.llvm.org/show_bug.cgi?id=43640">43640</a>
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<th>Summary</th>
<td>`final` does not cause devirtualization of nested calls
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>antoshkka@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>Consider the example:
struct A {
virtual int f() { return 0; }
virtual int g() { return f() + 40; }
};
struct B2 final : A {
int g() override;
};
int B2::g() { return A::g(); }
`B2` is final, so any call to the virtual functions of `A` end up with a call
to the same function in `B2`. So `B2::g()` should inline the `A::g()` and get
optimized to:
int B2::g() { return B2::f() + 40; }
Which is just 40, because `B2::f()` always returns 0.
Godbolt playground: <a href="https://godbolt.org/z/skqgH8">https://godbolt.org/z/skqgH8</a></pre>
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