Improve code completion for Objective-C message sends when the opening

'[' is missing. Prior commits improving recovery also improved code
completion beyond the first selector, e.g., at or after the "to" in

  calculator add:x to:y

but not after "calculator". We now provide the same completions for

  calculator <CC>

that we would for

  [calculator <CC>

if "calculator" is an expression whose type is something that can
receive Objective-C messages.

This code completion works for instance and super message sends, but not
class message sends.

llvm-svn: 113976

2 files changed, 23 insertions, 19 deletions

diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index 0f9154827e9..26563de2b25 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -664,12 +664,14 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
     }
 
     // In an Objective-C method, if we have "super" followed by an identifier,
-    // the token sequence is ill-fomed. However, if there's a ':' or ']' after
+    // the token sequence is ill-formed. However, if there's a ':' or ']' after
     // that identifier, this is probably a message send with a missing open
-    // bracket. Treat it as such.
-    if (getLang().ObjC1 && &II == Ident_super && Tok.is(tok::identifier) &&
+    // bracket. Treat it as such. 
+    if (getLang().ObjC1 && &II == Ident_super && !InMessageExpression &&
         getCurScope()->isInObjcMethodScope() &&
-        (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
+        ((Tok.is(tok::identifier) &&
+         (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
+         Tok.is(tok::code_completion))) {
       Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 
                                            0);
       break;
@@ -991,6 +993,15 @@ Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
   SourceLocation Loc;
   while (1) {
     switch (Tok.getKind()) {
+    case tok::code_completion:
+      if (InMessageExpression)
+        return move(LHS);
+        
+      Actions.CodeCompletePostfixExpression(getCurScope(), LHS.take());
+      ConsumeCodeCompletionToken();
+      LHS = ExprError();
+      break;
+        
     case tok::identifier:
       // If we see identifier: after an expression, and we're not already in a
       // message send, then this is probably a message send with a missing
diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index 7dc2cb3609d..fd6b5518d70 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -2728,6 +2728,10 @@ void Sema::CodeCompleteExpression(Scope *S,
                             Results.data(),Results.size());
 }
 
+void Sema::CodeCompletePostfixExpression(Scope *S, Expr *E) {
+  if (getLangOptions().ObjC1)
+    CodeCompleteObjCInstanceMessage(S, E, 0, 0, false);
+}
 
 static void AddObjCProperties(ObjCContainerDecl *Container, 
                               bool AllowCategories,
@@ -4014,7 +4018,7 @@ void Sema::CodeCompleteObjCPassingType(Scope *S, ObjCDeclSpec &DS) {
 /// common uses of Objective-C. This routine returns that class type,
 /// or NULL if no better result could be determined.
 static ObjCInterfaceDecl *GetAssumedMessageSendExprType(Expr *E) {
-  ObjCMessageExpr *Msg = dyn_cast<ObjCMessageExpr>(E);
+  ObjCMessageExpr *Msg = dyn_cast_or_null<ObjCMessageExpr>(E);
   if (!Msg)
     return 0;
 
@@ -4280,12 +4284,6 @@ void Sema::CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
 
 void Sema::CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
                                         IdentifierInfo **SelIdents,
-                                        unsigned NumSelIdents) {
-  CodeCompleteObjCClassMessage(S, Receiver, SelIdents, NumSelIdents, false);
-}
-
-void Sema::CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
-                                        IdentifierInfo **SelIdents,
                                         unsigned NumSelIdents,
                                         bool IsSuper) {
   typedef CodeCompletionResult Result;
@@ -4364,12 +4362,6 @@ void Sema::CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
 
 void Sema::CodeCompleteObjCInstanceMessage(Scope *S, ExprTy *Receiver,
                                            IdentifierInfo **SelIdents,
-                                           unsigned NumSelIdents) {
-  CodeCompleteObjCInstanceMessage(S, Receiver, SelIdents, NumSelIdents, false);
-}
-
-void Sema::CodeCompleteObjCInstanceMessage(Scope *S, ExprTy *Receiver,
-                                           IdentifierInfo **SelIdents,
                                            unsigned NumSelIdents,
                                            bool IsSuper) {
   typedef CodeCompletionResult Result;
@@ -4378,8 +4370,9 @@ void Sema::CodeCompleteObjCInstanceMessage(Scope *S, ExprTy *Receiver,
   
   // If necessary, apply function/array conversion to the receiver.
   // C99 6.7.5.3p[7,8].
-  DefaultFunctionArrayLvalueConversion(RecExpr);
-  QualType ReceiverType = RecExpr->getType();
+  if (RecExpr)
+    DefaultFunctionArrayLvalueConversion(RecExpr);
+  QualType ReceiverType = RecExpr? RecExpr->getType() : Context.getObjCIdType();
   
   // Build the set of methods we can see.
   ResultBuilder Results(*this);