Code-complete 'weak' for properties under ARC-with-weak-references (or GC)

Also, suggest 'readonly' even if the property has been given an ownership
attribute ('strong', 'weak', etc). This is used when properties are declared
readonly in the public interface but readwrite in a class extension.

<rdar://problem/11500004&11932285>

llvm-svn: 162220

1 files changed, 14 insertions, 10 deletions

diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index adf13271573..eb03d253a51 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -4595,26 +4595,23 @@ static bool ObjCPropertyFlagConflicts(unsigned Attributes, unsigned NewFlag) {
   
   // Check for collisions with "readonly".
   if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
-      (Attributes & (ObjCDeclSpec::DQ_PR_readwrite |
-                     ObjCDeclSpec::DQ_PR_assign |
-                     ObjCDeclSpec::DQ_PR_unsafe_unretained |
-                     ObjCDeclSpec::DQ_PR_copy |
-                     ObjCDeclSpec::DQ_PR_retain |
-                     ObjCDeclSpec::DQ_PR_strong)))
+      (Attributes & ObjCDeclSpec::DQ_PR_readwrite))
     return true;
   
-  // Check for more than one of { assign, copy, retain, strong }.
+  // Check for more than one of { assign, copy, retain, strong, weak }.
   unsigned AssignCopyRetMask = Attributes & (ObjCDeclSpec::DQ_PR_assign |
                                          ObjCDeclSpec::DQ_PR_unsafe_unretained |
                                              ObjCDeclSpec::DQ_PR_copy |
-                                             ObjCDeclSpec::DQ_PR_retain|
-                                             ObjCDeclSpec::DQ_PR_strong);
+                                             ObjCDeclSpec::DQ_PR_retain |
+                                             ObjCDeclSpec::DQ_PR_strong |
+                                             ObjCDeclSpec::DQ_PR_weak);
   if (AssignCopyRetMask &&
       AssignCopyRetMask != ObjCDeclSpec::DQ_PR_assign &&
       AssignCopyRetMask != ObjCDeclSpec::DQ_PR_unsafe_unretained &&
       AssignCopyRetMask != ObjCDeclSpec::DQ_PR_copy &&
       AssignCopyRetMask != ObjCDeclSpec::DQ_PR_retain &&
-      AssignCopyRetMask != ObjCDeclSpec::DQ_PR_strong)
+      AssignCopyRetMask != ObjCDeclSpec::DQ_PR_strong &&
+      AssignCopyRetMask != ObjCDeclSpec::DQ_PR_weak)
     return true;
   
   return false;
@@ -4650,6 +4647,13 @@ void Sema::CodeCompleteObjCPropertyFlags(Scope *S, ObjCDeclSpec &ODS) {
     Results.AddResult(CodeCompletionResult("nonatomic"));
   if (!ObjCPropertyFlagConflicts(Attributes, ObjCDeclSpec::DQ_PR_atomic))
     Results.AddResult(CodeCompletionResult("atomic"));
+
+  // Only suggest "weak" if we're compiling for ARC-with-weak-references or GC.
+  if ((getLangOpts().ObjCAutoRefCount && getLangOpts().ObjCRuntimeHasWeak) ||
+      getLangOpts().getGC() != LangOptions::NonGC)
+    if (!ObjCPropertyFlagConflicts(Attributes, ObjCDeclSpec::DQ_PR_weak))
+      Results.AddResult(CodeCompletionResult("weak"));
+
   if (!ObjCPropertyFlagConflicts(Attributes, ObjCDeclSpec::DQ_PR_setter)) {
     CodeCompletionBuilder Setter(Results.getAllocator(),
                                  Results.getCodeCompletionTUInfo());