[Modules][ObjC] Check definition from canonical decl on designated initializers

Use definition from canonical decl when checking for designated
initializers. This is necessary since deserialization of a interface
might reuse the definition from the canonical one (see r281119).

rdar://problem/29360655

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@301382 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/AST/DeclObjC.cpp b/lib/AST/DeclObjC.cpp
index 9218eb537a60b66bfd3233b359c34105adc351d0..a12a38033c4af8b72af1aef01ea34a99ce6ff189 100644 (file)
--- a/lib/AST/DeclObjC.cpp
+++ b/lib/AST/DeclObjC.cpp
@@ -539,9 +539,18 @@ void ObjCInterfaceDecl::getDesignatedInitializers(
 
 bool ObjCInterfaceDecl::isDesignatedInitializer(Selector Sel,
                                       const ObjCMethodDecl **InitMethod) const {
+  bool HasCompleteDef = isThisDeclarationADefinition();
+  // During deserialization the data record for the ObjCInterfaceDecl could
+  // be made invariant by reusing the canonical decl. Take this into account
+  // when checking for the complete definition.
+  if (!HasCompleteDef && getCanonicalDecl()->hasDefinition() &&
+      getCanonicalDecl()->getDefinition() == getDefinition())
+    HasCompleteDef = true;
+
   // Check for a complete definition and recover if not so.
-  if (!isThisDeclarationADefinition())
+  if (!HasCompleteDef)
     return false;
+
   if (data().ExternallyCompleted)
     LoadExternalDefinition();
 

diff --git a/test/Modules/Inputs/objc-desig-init/A.h b/test/Modules/Inputs/objc-desig-init/A.h
new file mode 100644 (file)
index 0000000..02e0105
--- /dev/null
+++ b/test/Modules/Inputs/objc-desig-init/A.h
@@ -0,0 +1 @@
+#import "A2.h"

diff --git a/test/Modules/Inputs/objc-desig-init/A2.h b/test/Modules/Inputs/objc-desig-init/A2.h
new file mode 100644 (file)
index 0000000..5a4ceb4
--- /dev/null
+++ b/test/Modules/Inputs/objc-desig-init/A2.h
@@ -0,0 +1,4 @@
+#import "Base.h"
+
+@interface A2 : Base
+@end

diff --git a/test/Modules/Inputs/objc-desig-init/Base.h b/test/Modules/Inputs/objc-desig-init/Base.h
new file mode 100644 (file)
index 0000000..4718425
--- /dev/null
+++ b/test/Modules/Inputs/objc-desig-init/Base.h
@@ -0,0 +1,4 @@
+@class NSString;
+@interface Base
+- (id)initWithNibName:(NSString *)nibNameOrNil __attribute__((objc_designated_initializer));
+@end

diff --git a/test/Modules/Inputs/objc-desig-init/X.h b/test/Modules/Inputs/objc-desig-init/X.h
new file mode 100644 (file)
index 0000000..cb46ba7
--- /dev/null
+++ b/test/Modules/Inputs/objc-desig-init/X.h
@@ -0,0 +1,4 @@
+#import "A2.h"
+
+@interface X : A2
+@end

diff --git a/test/Modules/Inputs/objc-desig-init/module.modulemap b/test/Modules/Inputs/objc-desig-init/module.modulemap
new file mode 100644 (file)
index 0000000..0150efb
--- /dev/null
+++ b/test/Modules/Inputs/objc-desig-init/module.modulemap
@@ -0,0 +1,9 @@
+module Base {
+  header "Base.h"
+  export *
+}
+
+module A {
+  header "A.h"
+  export *
+}

diff --git a/test/Modules/objc-designated-init-mod.m b/test/Modules/objc-designated-init-mod.m
new file mode 100644 (file)
index 0000000..15c25a3
--- /dev/null
+++ b/test/Modules/objc-designated-init-mod.m
@@ -0,0 +1,17 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -I %S/Inputs/objc-desig-init %s -verify
+// expected-no-diagnostics
+
+#import "X.h"
+#import "Base.h"
+#import "A.h"
+
+@implementation X
+
+- (instancetype)initWithNibName:(NSString *)nibName {
+  if ((self = [super initWithNibName:nibName])) {
+               return self;
+  }
+  return self;
+}
+@end