r333148 - [Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr

[Steven Wu via cfe-commits]

Author: steven_wu
Date: Wed May 23 18:01:43 2018
New Revision: 333148

URL: http://llvm.org/viewvc/llvm-project?rev=333148&view=rev
Log:
[Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr

Summary:
Remove the call to DiagnoseUseOfDecl in LookupMemberExpr because:
1. LookupMemberExpr eagerly lookup both getter and setter, reguardless
if they are used or not. It causes wrong diagnostics if you are only
using getter.
2. LookupMemberExpr only diagnoses getter, but not setter.
3. ObjCPropertyOpBuilder already DiagnoseUseOfDecl when building getter
and setter. Doing it again in LookupMemberExpr causes duplicated
diagnostics.

rdar://problem/38479756

Reviewers: erik.pilkington, arphaman, doug.gregor

Reviewed By: arphaman

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D47280

Modified:
    cfe/trunk/lib/Sema/SemaExprMember.cpp
    cfe/trunk/test/SemaObjC/property-deprecated-warning.m

Modified: cfe/trunk/lib/Sema/SemaExprMember.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaExprMember.cpp?rev=333148&r1=333147&r2=333148&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaExprMember.cpp (original)
+++ cfe/trunk/lib/Sema/SemaExprMember.cpp Wed May 23 18:01:43 2018
@@ -1490,9 +1490,6 @@ static ExprResult LookupMemberExpr(Sema
         }
 
         if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
-          // Check the use of this method.
-          if (S.DiagnoseUseOfDecl(OMD, MemberLoc))
-            return ExprError();
           Selector SetterSel =
             SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
                                                    S.PP.getSelectorTable(),

Modified: cfe/trunk/test/SemaObjC/property-deprecated-warning.m
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/property-deprecated-warning.m?rev=333148&r1=333147&r2=333148&view=diff
==============================================================================
--- cfe/trunk/test/SemaObjC/property-deprecated-warning.m (original)
+++ cfe/trunk/test/SemaObjC/property-deprecated-warning.m Wed May 23 18:01:43 2018
@@ -167,3 +167,14 @@ void testUserAccessorAttributes(Foo *foo
 	foo.x = foo.x; // expected-error {{property access is using 'x' method which is unavailable}} \
 		       // expected-warning {{property access is using 'setX:' method which is deprecated}}
 }
+
+// test implicit property does not emit duplicated warning.
+ at protocol Foo
+- (int)size __attribute__((availability(ios,deprecated=3.0))); // expected-note {{'size' has been explicitly marked deprecated here}}
+- (void)setSize: (int)x __attribute__((availability(ios,deprecated=2.0))); // expected-note {{'setSize:' has been explicitly marked deprecated here}}
+ at end
+
+void testImplicitProperty(id<Foo> object) {
+  object.size = object.size; // expected-warning {{'size' is deprecated: first deprecated in iOS 3.0}} \
+                             // expected-warning {{'setSize:' is deprecated: first deprecated in iOS 2.0}}
+}