Also synthesize _cmd and self for properties

[MadCoder]

Summary

Radar-Id: rdar://problem/57764169

[MadCoder]

@liuliu that fixes your test case (which I reproduced in the CG test)

[rjmccall]

It'd be nice if we didn't have to synthesize parameters for all declarations when we're just handling an @interface, but we can improve that in follow-ups.

[arphaman]

LGTM

[MadCoder]

In D71226#1776038, @rjmccall wrote:

It'd be nice if we didn't have to synthesize parameters for all declarations when we're just handling an @interface, but we can improve that in follow-ups.

yeah ideally I'd want to do it lazily when we emit the direct call, but at this point the Decl is const and that was a huge change to make.

[rjmccall]

Alternatively, we could make IRGen not depend on those parameters being set just to call a function, which seems reasonable since the parameter variables are logically internal to the implementation.

[liuliu]

Thanks. Verified in our codebase this patch indeed fixed the crashes!

clang/lib/Sema/SemaObjCProperty.cpp

if (!GetterMethod) {
     ProcessAPINotes(GetterMethod);
 
     if (getLangOpts().ObjCAutoRefCount)
       CheckARCMethodDecl(GetterMethod);
   } else
     // A user declared getter will be synthesize when @synthesize of
     // the property with the same name is seen in the @implementation
     GetterMethod->setPropertyAccessor(true);
+
+  GetterMethod->createImplicitParams(Context, GetterMethod->getClassInterface());
   property->setGetterMethodDecl(GetterMethod);
 
   // Skip setter if property is read-only.
   if (!property->isReadOnly()) {
     // Find the default setter and if one not found, add one.
     if (!SetterMethod) {
       // No instance/class method of same name as property setter name was
       // found.
if (!SetterMethod) {
       // It's possible for the user to have set a very odd custom
       // setter selector that causes it to have a method family.
       if (getLangOpts().ObjCAutoRefCount)
         CheckARCMethodDecl(SetterMethod);
     } else
       // A user declared setter will be synthesize when @synthesize of
       // the property with the same name is seen in the @implementation
       SetterMethod->setPropertyAccessor(true);
+
+    SetterMethod->createImplicitParams(Context, SetterMethod->getClassInterface());
     property->setSetterMethodDecl(SetterMethod);
   }
   // Add any synthesized methods to the global pool. This allows us to
   // handle the following, which is supported by GCC (and part of the design).
   //
   // @interface Foo
   // @property double bar;
   // @end

clang/test/CodeGenObjC/direct-method.m

 
 int useRoot(Root *r) {
   // CHECK-LABEL: define i32 @useRoot
   // CHECK: %{{[^ ]*}} = call i32 bitcast {{.*}} @"\01-[Root getInt]"
   // CHECK: %{{[^ ]*}} = call i32 bitcast {{.*}} @"\01-[Root intProperty]"
   // CHECK: %{{[^ ]*}} = call i32 bitcast {{.*}} @"\01-[Root intProperty2]"
   return [r getInt] + [r intProperty] + [r intProperty2];
 }
+
+__attribute__((objc_root_class))
+@interface RootDeclOnly
+@property(direct, readonly) int intProperty;
+@end
+
+int useRootDeclOnly(RootDeclOnly *r) {
+  // CHECK-LABEL: define i32 @useRootDeclOnly
+  // CHECK: %{{[^ ]*}} = call i32 bitcast {{.*}} @"\01-[RootDeclOnly intProperty]"
+  return [r intProperty];
+}