https://llvm.org/bugs/show_bug.cgi?id=27532
Bug ID: 27532
Summary: injected-class-name should not be modelled as a
CXXRecordDecl
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
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.
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