to support operators defined as member functions, e.g.,

  struct X { 
    bool operator==(X&);
  };

Overloading with non-member operators is supported, and the special
rules for the implicit object parameter (e.g., the ability for a
non-const *this to bind to an rvalue) are implemented.

This change also refactors and generalizes the code for adding
overload candidates for overloaded operator calls (C++ [over.match.expr]),
both to match the rules more exactly (name lookup of non-member
operators actually ignores member operators) and to make this routine
more reusable for the other overloaded operators.

Testing for the initialization of the implicit object parameter is
very light. More tests will come when we get support for calling
member functions directly (e.g., o.m(a1, a2)).

llvm-svn: 59564

llvm-svn: 59561

__weak objects.

llvm-svn: 59560

llvm-svn: 59556

return Diag(...);

when the function returns bool.  This always evaluates to true.

llvm-svn: 59555

llvm-svn: 59554

llvm-svn: 59553

llvm-svn: 59543

As soon as we detect duplicate interfaces, discontinue further semantic checks (returning the original interface).

This is now consistent with how we handle protocols (and less error prone in general).

llvm-svn: 59541

llvm-svn: 59539

llvm-svn: 59537

suite with clang.

llvm-svn: 59536

 - PR3094.
 - No test case, ccc is not really a supported product (llvmc2 already
   got this right).

llvm-svn: 59535

llvm-svn: 59534

llvm-svn: 59533

DeclRefExprs and BlockDeclRefExprs into a single function
Sema::ActOnDeclarationNameExpr, eliminating a bunch of duplicate
lookup-name-and-check-the-result code.

Note that we still have the three parser entry points for identifiers,
operator-function-ids, and conversion-function-ids, since the parser
doesn't (and shouldn't) know about DeclarationNames. This is a Good
Thing (TM), and there will be more entrypoints coming (e.g., for C++
pseudo-destructor expressions).

llvm-svn: 59527

operator+, directly, using the same mechanism as all other special
names.

Removed the "special" identifiers for the overloaded operators from
the identifier table and IdentifierInfo data structure. IdentifierInfo
is back to representing only real identifiers.

Added a new Action, ActOnOperatorFunctionIdExpr, that builds an
expression from an parsed operator-function-id (e.g., "operator
+"). ActOnIdentifierExpr used to do this job, but
operator-function-ids are no longer represented by IdentifierInfo's.

Extended Declarator to store overloaded operator names. 
Sema::GetNameForDeclarator now knows how to turn the operator
name into a DeclarationName for the overloaded operator. 

Except for (perhaps) consolidating the functionality of
ActOnIdentifier, ActOnOperatorFunctionIdExpr, and
ActOnConversionFunctionExpr into a common routine that builds an
appropriate DeclRefExpr by looking up a DeclarationName, all of the
work on normalizing declaration names should be complete with this
commit.

llvm-svn: 59526

llvm-svn: 59523

llvm-svn: 59522

handle the case that the array element is of structure type when bind the whole array to a single value (for example, UnknownVal, UndefinedVal).

llvm-svn: 59521

llvm-svn: 59512

llvm-svn: 59511

llvm-svn: 59510

and let the clients push whatever they want into the DiagnosticInfo
instead of hard coding a few forms.  Also switch various clients to
use Diag(Tok, ...) instead of Diag(Tok.getLocation(), ...) as the
canonical form to simplify the code a bit.

llvm-svn: 59509

invalid expr/stmt, etc.

llvm-svn: 59508

is destructive.

llvm-svn: 59507

llvm-svn: 59506

llvm-svn: 59503

are formed.  In particular, a diagnostic with all its strings and ranges is now
packaged up and sent to DiagnosticClients as a DiagnosticInfo instead of as a 
ton of random stuff.  This has the benefit of simplifying the interface, making
it more extensible, and allowing us to do more checking for things like access
past the end of the various arrays passed in.

In addition to introducing DiagnosticInfo, this also substantially changes how 
Diagnostic::Report works.  Instead of being passed in all of the info required
to issue a diagnostic, Report now takes only the required info (a location and 
ID) and returns a fresh DiagnosticInfo *by value*.  The caller is then free to
stuff strings and ranges into the DiagnosticInfo with the << operator.  When
the dtor runs on the DiagnosticInfo object (which should happen at the end of
the statement), the diagnostic is actually emitted with all of the accumulated
information.  This is a somewhat tricky dance, but it means that the 
accumulated DiagnosticInfo is allowed to keep pointers to other expression 
temporaries without those pointers getting invalidated.

This is just the minimal change to get this stuff working, but this will allow
us to eliminate the zillions of variant "Diag" methods scattered throughout
(e.g.) sema.  For example, instead of calling:

  Diag(BuiltinLoc, diag::err_overload_no_match, typeNames,
       SourceRange(BuiltinLoc, RParenLoc));

We will soon be able to just do:

  Diag(BuiltinLoc, diag::err_overload_no_match)
      << typeNames << SourceRange(BuiltinLoc, RParenLoc));

This scales better to support arbitrary types being passed in (not just 
strings) in a type-safe way.  Go operator overloading?!

llvm-svn: 59502

llvm-svn: 59499

Use mutable to make it so.

llvm-svn: 59498

delete huge trailing whitespace to fit in 80 cols.

llvm-svn: 59497

llvm-svn: 59495

strings instead of array of strings.  This reduces string copying
in some not-very-important cases, but paves the way for future 
improvements.

llvm-svn: 59494

llvm-svn: 59493

llvm-svn: 59492

llvm-svn: 59491

llvm-svn: 59490

- Add static method to test if the current lexer is a non-macro/non-pragma
  lexer.
- Refactor some code in PPLexerChange to use this static method.
- No performance change.

llvm-svn: 59486

llvm-svn: 59485