Keep definition provenance to skip enum variants

Enum variants shouldn't be accessed directly even from within an enum.
This commit keeps the provenance for enum variants definition so we
can skip them when resolving a value within an enum definition.

gcc/rust/ChangeLog:

	* resolve/rust-forever-stack.h: Add new function to insert enum
	variants and add argument to resolver's get function to explicitely
	skip enum variants.
	* resolve/rust-forever-stack.hxx: Update function
	definitions.
	* resolve/rust-name-resolution-context.cc (NameResolutionContext::insert_variant):
	Add function to insert enum variants.
	* resolve/rust-name-resolution-context.h: Add function's prototype.
	* resolve/rust-rib.cc (Rib::Definition::Definition): Add new boolean to
	hint at enum variant provenance.
	(Rib::Definition::is_variant): New getter for variant status.
	(Rib::Definition::Shadowable): Update constructor to opt out of enum
	variants.
	(Rib::Definition::Globbed): Likewise.
	(Rib::Definition::NonShadowable): Change constructor to forward enum
	variant provenance status.
	* resolve/rust-rib.h: Update function prototypes.
	* resolve/rust-toplevel-name-resolver-2.0.cc (TopLevel::insert_enum_variant_or_error_out):
	Add function to insert enum variants in the name resolver.
	(TopLevel::visit): Update several enum variant's visitor function
	with the new enum variant name resolving code.
	* resolve/rust-toplevel-name-resolver-2.0.h: Update function
	prototypes.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/gcc/rust/resolve/rust-name-resolution-context.cc b/gcc/rust/resolve/rust-name-resolution-context.cc
index 1a70cd0..38994fe 100644
--- a/gcc/rust/resolve/rust-name-resolution-context.cc
+++ b/gcc/rust/resolve/rust-name-resolution-context.cc
@@ -46,6 +46,12 @@ NameResolutionContext::insert (Identifier name, NodeId id, Namespace ns)
 }
 
 tl::expected<NodeId, DuplicateNameError>
+NameResolutionContext::insert_variant (Identifier name, NodeId id)
+{
+  return types.insert_variant (name, id);
+}
+
+tl::expected<NodeId, DuplicateNameError>
 NameResolutionContext::insert_shadowable (Identifier name, NodeId id,
 					  Namespace ns)
 {