This patch to the Go frontend by Cherry Zhang uses the underlying type
to build the placeholder type for aliases. When asking for a
placeholder type of an alias type, this builds a placeholder for the
underlying type, instead of treating the alias as a named type and
calling get_backend. The latter may fail as we may not be ready to
build a complete backend type. We have already used a unified backend
type for alias type and its underlying type. Do the same for
placeholders as well. Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu. Committed to mainline.
Ian
Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE (revision 264772)
+++ gcc/go/gofrontend/MERGE (working copy)
@@ -1,4 +1,4 @@
-2f56d51c6b3104242613c74b02fa6c63a2fe16c5
+53d0d7ca278a5612fcdb5fb098e7bf950a0178ef
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.
Index: gcc/go/gofrontend/types.cc
===================================================================
--- gcc/go/gofrontend/types.cc (revision 264648)
+++ gcc/go/gofrontend/types.cc (working copy)
@@ -1125,6 +1125,8 @@ Type::get_backend_placeholder(Gogo* gogo
case TYPE_FORWARD:
// Named types keep track of their own dependencies and manage
// their own placeholders.
+ if (this->named_type() != NULL && this->named_type()->is_alias())
+ return this->unalias()->get_backend_placeholder(gogo);
return this->get_backend(gogo);
case TYPE_INTERFACE:
