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

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

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

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

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

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: 59491

- 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

llvm-svn: 59484

llvm-svn: 59483

llvm-svn: 59482

Performance tests on Cocoa.h (using the regular Lexer) shows no performance
difference.

llvm-svn: 59479

This is because the PTHLexer will not support this method. Performance testing
on preprocessing Cocoa.h shows that this results in a negligible performance
difference (less than 1%).

I tried making Lexer::SetCommentRetentionState() an out-of-line function (a
precursor to making it a virtual function in PreprocessorLexer) and noticed a 1%
decrease in speed (it is called in a hot part of the Preprocessor).

llvm-svn: 59477

alias for the current PreprocessorLexer. No functionality change. Performance
testing shows this results in no performance degradation when preprocessing
Cocoa.h.

llvm-svn: 59474

  PreprocessorLexer, which will either be a 'Lexer' or 'PTHLexer'.
- Added stub field 'CurPTHLexer' to keep track of the current PTHLexer.
- Modified IncludeStackInfo to track both the current PTHLexer and
  current PreprocessorLexer.

llvm-svn: 59472

llvm-svn: 59470

destructors, and conversion functions. The placeholders were used to
work around the fact that the parser and some of Sema really wanted
declarators to have simple identifiers; now, the code that deals with
declarators will use DeclarationNames.

llvm-svn: 59469

where the control reaches the end of a non-void function and also allows the
compiler to generate better code.  When this assertion is false we can easily
add more else cases.

llvm-svn: 59468

Missing special lookup rule in Sema::ActOnInstanceMessage().

llvm-svn: 59467

C++ constructors, destructors, and conversion functions now have a
FETokenInfo field that IdentifierResolver can access, so that these
special names are handled just like ordinary identifiers. A few other
Sema routines now use DeclarationNames instead of IdentifierInfo*'s.

To validate this design, this code also implements parsing and
semantic analysis for id-expressions that name conversion functions,
e.g.,

  return operator bool();

The new parser action ActOnConversionFunctionExpr takes the result of
parsing "operator type-id" and turning it into an expression, using
the IdentifierResolver with the DeclarationName of the conversion
function. ActOnDeclarator pushes those conversion function names into
scope so that the IdentifierResolver can find them, of course.

llvm-svn: 59462

are trying to use the old GCC "casts as lvalue" extension.  We don't and
will hopefully never support this.

llvm-svn: 59460

llvm-svn: 59459

llvm-svn: 59444

llvm-svn: 59443

llvm-svn: 59442