gccrs: Resolve labels

gcc/rust/ChangeLog:

	* hir/rust-ast-lower.cc (ASTLoweringBlock::visit): Lower label only if
	it exists.
	* hir/tree/rust-hir-expr.cc (BlockExpr::BlockExpr): Make loop label
	optional.
	(BaseLoopExpr::BaseLoopExpr): Likewise.
	(LoopExpr::LoopExpr): Likewise.
	(WhileLoopExpr::WhileLoopExpr): Likewise.
	* hir/tree/rust-hir-expr.h: Use optional for lifetime and labels.
	* hir/tree/rust-hir.cc (WhileLoopExpr::as_string): Use getter.
	(WhileLetLoopExpr::as_string): Likewise.
	(LoopExpr::as_string): Likewise.
	* resolve/rust-late-name-resolver-2.0.cc (Late::visit): Resolve labels.
	* resolve/rust-late-name-resolver-2.0.h: Add visit function prototype
	for loop labels.

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

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/rust/resolve/rust-late-name-resolver-2.0.cc b/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
index d18e7e2..e0006fd 100644
--- a/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
+++ b/gcc/rust/resolve/rust-late-name-resolver-2.0.cc
@@ -213,6 +213,25 @@ Late::visit (AST::BreakExpr &expr)
 }
 
 void
+Late::visit (AST::LoopLabel &label)
+{
+  // Shall we move this to visit(AST::Lifetime) or do we need to
+  // keep the context ?
+  auto lifetime = label.get_lifetime ();
+  if (auto resolved = ctx.labels.get (lifetime.as_string ()))
+    {
+      ctx.map_usage (Usage (lifetime.get_node_id ()),
+		     Definition (resolved->get_node_id ()));
+    }
+  else
+    {
+      ctx.labels.insert (Identifier (lifetime.as_string (),
+				     lifetime.get_locus ()),
+			 lifetime.get_node_id ());
+    }
+}
+
+void
 Late::visit (AST::IdentifierExpr &expr)
 {
   // TODO: same thing as visit(PathInExpression) here?