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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - injected-class-name should not be modelled as a CXXRecordDecl"
href="https://llvm.org/bugs/show_bug.cgi?id=27532">27532</a>
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<th>Summary</th>
<td>injected-class-name should not be modelled as a CXXRecordDecl
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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
</td>
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<th>OS</th>
<td>Linux
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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>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>We currently model an injected-class-name declaration as a CXXRecordDecl. This
leads to a number of problems and violations of our usual AST invariants. For
instance:
* the redecl chain of a ClassTemplateSpecializationDecl contains declarations
that are not ClassTemplateSpecializationDecls, and getPreviousDecl sometimes
(!!!) skips over them (depending on the static type of the object expression)
* not all declarations of the same entity are guaranteed to have the same
semantic DeclContext
* we waste memory on a DeclContext that can never have any children or lookups
... and so on.
Given that most lookups that find the injected-class-name are actually required
to find the constructors rather than the type, this is an especially poor
representation.
We should use a different kind of Decl here (InjectedClassNameDecl?) and update
the (relatively small) number of places that really want to map from the
injected-class-name to the class type to do so manually.</pre>
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