Add support for enums on the match expression

This is our initial first pass of adding support for the MatchExpr though
two things stand out here. We need to switch over to using a GCC enumeral
type for the union qualifier so we get advantage of the GCC code to ensure
all variants are being addressed. We also need to fix out enum type to
get better gdb support which might be simply chaning over to the
qual_union_type.

Fixes #190

1 files changed, 16 insertions, 0 deletions

diff --git a/gcc/rust/backend/rust-compile-context.h b/gcc/rust/backend/rust-compile-context.h
index 6347e76..896d42e 100644
--- a/gcc/rust/backend/rust-compile-context.h
+++ b/gcc/rust/backend/rust-compile-context.h
@@ -233,6 +233,21 @@ public:
     return true;
   }
 
+  void insert_pattern_binding (HirId id, tree binding)
+  {
+    implicit_pattern_bindings[id] = binding;
+  }
+
+  bool lookup_pattern_binding (HirId id, tree *binding)
+  {
+    auto it = implicit_pattern_bindings.find (id);
+    if (it == implicit_pattern_bindings.end ())
+      return false;
+
+    *binding = it->second;
+    return true;
+  }
+
   void push_fn (tree fn, ::Bvariable *ret_addr)
   {
     fn_stack.push_back (fncontext{fn, ret_addr});
@@ -326,6 +341,7 @@ private:
   std::map<const TyTy::BaseType *, std::pair<HirId, tree>> mono;
   std::map<DefId, std::vector<std::pair<const TyTy::BaseType *, tree>>>
     mono_fns;
+  std::map<HirId, tree> implicit_pattern_bindings;
 
   // To GCC middle-end
   std::vector<tree> type_decls;