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The following attributes are currently supported in C++0x attribute
lists (and in GNU ones as well):
- align() - semantics believed to be conformant to n3000, except for
redeclarations and what entities it may apply to
- final - semantics believed to be conformant to CWG issue 817's proposed
wording, except for redeclarations
- noreturn - semantics believed to be conformant to n3000, except for
redeclarations
- carries_dependency - currently ignored (this is an optimization hint)
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handling template template parameters properly. This refactoring:
- Parses template template arguments as id-expressions, representing
the result of the parse as a template name (Action::TemplateTy)
rather than as an expression (lame!).
- Represents all parsed template arguments via a new parser-specific
type, ParsedTemplateArgument, which stores the kind of template
argument (type, non-type, template) along with all of the source
information about the template argument. This replaces an ad hoc
set of 3 vectors (one for a void*, which was either a type or an
expression; one for a bit telling whether the first was a type or
an expression; and one for a single source location pointing at
the template argument).
- Moves TemplateIdAnnotation into the new Parse/Template.h. It never
belonged in the Basic library anyway.
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appears in a deprecated context. In the new strategy, we emit the warnings
as usual unless we're currently parsing a declaration, where "declaration" is
restricted to mean a decl group or a few special cases in Objective C. If
we *are* parsing a declaration, we queue up the deprecation warnings until
the declaration has been completely parsed, and then emit them only if the
decl is not deprecated.
We also standardize the bookkeeping for deprecation so as to avoid special cases.
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overloaded operators, e.g.,
p->template operator+<T>()
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operators, e.g.,
operator+<int>
which now works in declarators, id-expressions, and member access
expressions. This commit only implements the non-dependent case, where
we can resolve the template-id to an actual declaration.
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anchor the vtable to Parser.cpp for good measure.
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declarators are parsed primarily within a single function (at least for
these cases). Remove some excess diagnostics arising during parse failures.
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annotation token.
- I'm not sure what the best thing to print is, for now we just print the token
location and 'at annotation token'.
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expression, or statement
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then drop it on the floor.
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x->Base::f
We no longer try to "enter" the context of the type that "x" points
to. Instead, we drag that object type through the parser and pass it
into the Sema routines that need to know how to perform lookup within
member access expressions.
We now implement most of the crazy name lookup rules in C++
[basic.lookup.classref] for non-templated code, including performing
lookup both in the context of the type referred to by the member
access and in the scope of the member access itself and then detecting
ambiguities when the two lookups collide (p1 and p4; p3 and p7 are
still TODO). This change also corrects our handling of name lookup
within template arguments of template-ids inside the
nested-name-specifier (p6; we used to look into the scope of the
object expression for them) and fixes PR4703.
I have disabled some tests that involve member access expressions
where the object expression has dependent type, because we don't yet
have the ability to describe dependent nested-name-specifiers starting
with an identifier.
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their members, including member class template, member function
templates, and member classes and functions of member templates.
To actually parse the nested-name-specifiers that qualify the name of
an out-of-line definition of a member template, e.g.,
template<typename X> template<typename Y>
X Outer<X>::Inner1<Y>::foo(Y) {
return X();
}
we need to look for the template names (e.g., "Inner1") as a member of
the current instantiation (Outer<X>), even before we have entered the
scope of the current instantiation. Since we can't do this in general
(i.e., we should not be looking into all dependent
nested-name-specifiers as if they were the current instantiation), we
rely on the parser to tell us when it is parsing a declaration
specifier sequence, and, therefore, when we should consider the
current scope specifier to be a current instantiation.
Printing of complicated, dependent nested-name-specifiers may be
somewhat broken by this commit; I'll add tests for this issue and fix
the problem (if it still exists) in a subsequent commit.
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member templates declared inside other templates. This allows us to
match out-of-line definitions of member function templates within
class templates to the declarations within the class template. We
still can't handle out-of-line definitions for member class templates,
however.
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elsewhere. Very slightly decouples DeclSpec users from knowing the exact
diagnostics to report, and makes it easier to provide different diagnostics in
some places.
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destruction of base/members for each destructor AST.
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base/members.
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out of line definition.
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declaration in the AST.
The new ASTContext::getCommentForDecl function searches for a comment
that is attached to the given declaration, and returns that comment,
which may be composed of several comment blocks.
Comments are always available in an AST. However, to avoid harming
performance, we don't actually parse the comments. Rather, we keep the
source ranges of all of the comments within a large, sorted vector,
then lazily extract comments via a binary search in that vector only
when needed (which never occurs in a "normal" compile).
Comments are written to a precompiled header/AST file as a blob of
source ranges. That blob is only lazily loaded when one requests a
comment for a declaration (this never occurs in a "normal" compile).
The indexer testbed now supports comment extraction. When the
-point-at location points to a declaration with a Doxygen-style
comment, the indexer testbed prints the associated comment
block(s). See test/Index/comments.c for an example.
Some notes:
- We don't actually attempt to parse the comment blocks themselves,
beyond identifying them as Doxygen comment blocks to associate them
with a declaration.
- We won't find comment blocks that aren't adjacent to the
declaration, because we start our search based on the location of
the declaration.
- We don't go through the necessary hops to find, for example,
whether some redeclaration of a declaration has comments when our
current declaration does not. Similarly, we don't attempt to
associate a \param Foo marker in a function body comment with the
parameter named Foo (although that is certainly possible).
- Verification of my "no performance impact" claims is still "to be
done".
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making sure we return true when annotating a function template with
explicit template arguments, but not when we don't annotate anything.)
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it doesn't actually work yet; we just error out a bit more gracefully.
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this case
but at least we don't crash :)
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ActOnFunctionDeclarator for function template definitions
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parser. Rather than placing all of the delayed member function
declarations and inline definitions into a single bucket corresponding
to the top-level class, we instead mirror the nesting structure of the
nested classes and place the delayed member functions into their
appropriate place. Then, when we actually parse the delayed member
function declarations, set up the scope stack the same way as it was
when we originally saw the declaration, so that we can find, e.g.,
template parameters that are in scope.
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template class X<int>;
This also cleans up the propagation of template information through
declaration parsing, which is used to improve some diagnostics.
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template parameters.
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parse just a single declaration and provide a reasonable diagnostic
when the "only one declarator per template declaration" rule is
violated. This eliminates some ugly, ugly hackery where we used to
require thatn the layout of a DeclGroup of a single element be the
same as the layout of a single declaration.
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can't track down.
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of the range is now the ';' location. For something like this:
$ cat t2.c
#define bool int
void f(int x, int y) {
bool b = !x && y;
}
We used to produce:
$ clang-cc t2.c -ast-dump
typedef char *__builtin_va_list;
void f(int x, int y)
(CompoundStmt 0x2201f10 <t2.c:3:22, line:5:1>
(DeclStmt 0x2201ef0 <line:2:14> <----
0x2201a20 "int b =
(BinaryOperator 0x2201ed0 <line:4:10, col:16> 'int' '&&'
(UnaryOperator 0x2201e90 <col:10, col:11> 'int' prefix '!'
(DeclRefExpr 0x2201c90 <col:11> 'int' ParmVar='x' 0x2201a50))
(DeclRefExpr 0x2201eb0 <col:16> 'int' ParmVar='y' 0x2201e10))")
Now we produce:
$ clang-cc t2.c -ast-dump
typedef char *__builtin_va_list;
void f(int x, int y)
(CompoundStmt 0x2201f10 <t2.c:3:22, line:5:1>
(DeclStmt 0x2201ef0 <line:2:14, line:4:17> <------
0x2201a20 "int b =
(BinaryOperator 0x2201ed0 <col:10, col:16> 'int' '&&'
(UnaryOperator 0x2201e90 <col:10, col:11> 'int' prefix '!'
(DeclRefExpr 0x2201c90 <col:11> 'int' ParmVar='x' 0x2201a50))
(DeclRefExpr 0x2201eb0 <col:16> 'int' ParmVar='y' 0x2201e10))")
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Plus, reword a extension warnings to avoid talking about "ISO C" when
the extension might also be available in C++ or C++0x.
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failures that involve malformed types, e.g., "typename X::foo" where
"foo" isn't a type, or "std::vector<void>" that doens't instantiate
properly.
Similarly, be a bit smarter in our handling of ambiguities that occur
in Sema::getTypeName, to eliminate duplicate error messages about
ambiguous name lookup.
This eliminates two XFAILs in test/SemaCXX, one of which was crying
out to us, trying to tell us that we were producing repeated error
messages.
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specifiers that terminate in a simple-template-id, e.g.,
typename MetaFun::template apply<T1, T2>
Also, implement template instantiation for dependent
nested-name-specifiers that involve unresolved identifiers, e.g.,
typename T::type::type
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within nested-name-specifiers, e.g., for the "apply" in
typename MetaFun::template apply<T1, T2>::type
At present, we can't instantiate these nested-name-specifiers, so our
testing is sketchy.
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representation handles the various ways in which one can name a
template, including unqualified references ("vector"), qualified
references ("std::vector"), and dependent template names
("MetaFun::template apply").
One immediate effect of this change is that the representation of
nested-name-specifiers in type names for class template
specializations (e.g., std::vector<int>) is more accurate. Rather than
representing std::vector<int> as
std::(vector<int>)
we represent it as
(std::vector)<int>
which more closely follows the C++ grammar.
Additionally, templates are no longer represented as declarations
(DeclPtrTy) in Parse-Sema interactions. Instead, I've introduced a new
OpaquePtr type (TemplateTy) that holds the representation of a
TemplateName. This will simplify the handling of dependent
template-names, once we get there.
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into ParseSimpleDeclaration, and improve a diagnostic.
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productions (except the already broken ObjC cases like @class X,Y;) in
the parser that can produce more than one Decl return a DeclGroup instead
of a Decl, etc.
This allows elimination of the Decl::NextDeclarator field, and exposes
various clients that should look at all decls in a group, but which were
only looking at one (such as the dumper, printer, etc). These have been
fixed.
Still TODO:
1) there are some FIXME's in the code about potentially using
DeclGroup for better location info.
2) ParseObjCAtDirectives should return a DeclGroup due to @class etc.
3) I'm not sure what is going on with StmtIterator.cpp, or if it can
be radically simplified now.
4) I put a truly horrible hack in ParseTemplate.cpp.
I plan to bring up #3/4 on the mailing list, but don't plan to tackle
#1/2 in the short term.
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pointer. Its purpose in life is to be a glorified void*, but which does not
implicitly convert to void* or other OpaquePtr's with a different UID.
Introduce Action::DeclPtrTy which is a typedef for OpaquePtr<0>. Change the
entire parser/sema interface to use DeclPtrTy instead of DeclTy*. This
makes the C++ compiler enforce that these aren't convertible to other opaque
types.
We should also convert ExprTy, StmtTy, TypeTy, AttrTy, BaseTy, etc,
but I don't plan to do that in the short term.
The one outstanding known problem with this patch is that we lose the
bitmangling optimization where ActionResult<DeclPtrTy> doesn't know how to
bitmangle the success bit into the low bit of DeclPtrTy. I will rectify
this with a subsequent patch.
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instantiation for C++ typename-specifiers such as
typename T::type
The parsing of typename-specifiers is relatively easy thanks to
annotation tokens. When we see the "typename", we parse the
typename-specifier and produce a typename annotation token. There are
only a few places where we need to handle this. We currently parse the
typename-specifier form that terminates in an identifier, but not the
simple-template-id form, e.g.,
typename T::template apply<U, V>
Parsing of nested-name-specifiers has a similar problem, since at this
point we don't have any representation of a class template
specialization whose template-name is unknown.
Semantic analysis is only partially complete, with some support for
template instantiation that works for simple examples.
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all the way down to ActOnClassTemplate.
Doug, Sebastian: Plz review! :)
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line decls, such as:
class C {
C() { }
int a;
};
C::C() : a(10) { }
We also diagnose when initializers are used on declarations that aren't constructors:
t.cpp:1:10: error: only constructors take base initializers
void f() : a(10) { }
^
Doug and/or Sebastian: I'd appreciate a review, especially the nested-name-spec test results (from the looks of it we now match gcc in that test.)
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qualified name, e.g.,
foo::x
so that we retain the nested-name-specifier as written in the source
code and can reproduce that qualified name when printing the types
back (e.g., in diagnostics). This is PR3493, which won't be complete
until finished the other tasks mentioned near the end of this commit.
The parser's representation of nested-name-specifiers, CXXScopeSpec,
is now a bit fatter, because it needs to contain the scopes that
precede each '::' and keep track of whether the global scoping
operator '::' was at the beginning. For example, we need to keep track
of the leading '::', 'foo', and 'bar' in
::foo::bar::x
The Action's CXXScopeTy * is no longer a DeclContext *. It's now the
opaque version of the new NestedNameSpecifier, which contains a single
component of a nested-name-specifier (either a DeclContext * or a Type
*, bitmangled).
The new sugar type QualifiedNameType composes a sequence of
NestedNameSpecifiers with a representation of the type we're actually
referring to. At present, we only build QualifiedNameType nodes within
Sema::getTypeName. This will be extended to other type-constructing
actions (e.g., ActOnClassTemplateId).
Also on the way: QualifiedDeclRefExprs will also store a sequence of
NestedNameSpecifiers, so that we can print out the property
nested-name-specifier. I expect to also use this for handling
dependent names like Fibonacci<I - 1>::value.
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