compiler: Fix handling of hidden methods for unnamed types.

If an interface has hidden methods, we must make the interface
table comdat if it is for an unnamed type.

When we create a stub method for an unnamed type, don't make
it publically visible.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@203468 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 23 insertions, 6 deletions

diff --git a/gcc/go/gofrontend/gogo-tree.cc b/gcc/go/gofrontend/gogo-tree.cc
index fbc46526ef0..ca80869da6a 100644
--- a/gcc/go/gofrontend/gogo-tree.cc
+++ b/gcc/go/gofrontend/gogo-tree.cc
@@ -2154,10 +2154,11 @@ Gogo::interface_method_table_for_type(const Interface_type* interface,
   TREE_CONSTANT(decl) = 1;
   DECL_INITIAL(decl) = constructor;
 
-  // If the interface type has hidden methods, then this is the only
-  // definition of the table.  Otherwise it is a comdat table which
-  // may be defined in multiple packages.
-  if (has_hidden_methods)
+  // If the interface type has hidden methods, and the table is for a
+  // named type, then this is the only definition of the table.
+  // Otherwise it is a comdat table which may be defined in multiple
+  // packages.
+  if (has_hidden_methods && type->named_type() != NULL)
     TREE_PUBLIC(decl) = 1;
   else
     {
diff --git a/gcc/go/gofrontend/gogo.cc b/gcc/go/gofrontend/gogo.cc
index 0796caaa94c..eebb75377fa 100644
--- a/gcc/go/gofrontend/gogo.cc
+++ b/gcc/go/gofrontend/gogo.cc
@@ -3320,7 +3320,8 @@ Function::Function(Function_type* type, Function* enclosing, Block* block,
     closure_var_(NULL), block_(block), location_(location), labels_(),
     local_type_count_(0), descriptor_(NULL), fndecl_(NULL), defer_stack_(NULL),
     is_sink_(false), results_are_named_(false), nointerface_(false),
-    calls_recover_(false), is_recover_thunk_(false), has_recover_thunk_(false),
+    is_unnamed_type_stub_method_(false), calls_recover_(false),
+    is_recover_thunk_(false), has_recover_thunk_(false),
     in_unique_section_(false)
 {
 }
@@ -3844,7 +3845,8 @@ Function::get_or_make_decl(Gogo* gogo, Named_object* no)
       else if (!Gogo::is_hidden_name(no->name())
                || this->type_->is_method())
         {
-          is_visible = true;
+	  if (!this->is_unnamed_type_stub_method_)
+	    is_visible = true;
           std::string pkgpath = gogo->pkgpath_symbol();
           if (this->type_->is_method()
               && Gogo::is_hidden_name(no->name())
diff --git a/gcc/go/gofrontend/gogo.h b/gcc/go/gofrontend/gogo.h
index 8c4ccf98179..31b258d62d6 100644
--- a/gcc/go/gofrontend/gogo.h
+++ b/gcc/go/gofrontend/gogo.h
@@ -953,6 +953,15 @@ class Function
     this->nointerface_ = true;
   }
 
+  // Record that this function is a stub method created for an unnamed
+  // type.
+  void
+  set_is_unnamed_type_stub_method()
+  {
+    go_assert(this->is_method());
+    this->is_unnamed_type_stub_method_ = true;
+  }
+
   // Add a new field to the closure variable.
   void
   add_closure_field(Named_object* var, Location loc)
@@ -1178,6 +1187,9 @@ class Function
   bool results_are_named_ : 1;
   // True if this method should not be included in the type descriptor.
   bool nointerface_ : 1;
+  // True if this function is a stub method created for an unnamed
+  // type.
+  bool is_unnamed_type_stub_method_ : 1;
   // True if this function calls the predeclared recover function.
   bool calls_recover_ : 1;
   // True if this a thunk built for a function which calls recover.
diff --git a/gcc/go/gofrontend/types.cc b/gcc/go/gofrontend/types.cc
index f73ca7ae6f6..69e3e99c1ff 100644
--- a/gcc/go/gofrontend/types.cc
+++ b/gcc/go/gofrontend/types.cc
@@ -9031,6 +9031,8 @@ Type::build_stub_methods(Gogo* gogo, const Type* type, const Methods* methods,
 				      fntype->is_varargs(), location);
 	  gogo->finish_function(fntype->location());
 
+	  if (type->named_type() == NULL && stub->is_function())
+	    stub->func_value()->set_is_unnamed_type_stub_method();
 	  if (m->nointerface() && stub->is_function())
 	    stub->func_value()->set_nointerface();
 	}