Remove old unused code pass this was too generic

This now uses the TREE_USED fields on GCC tree's to track the usage of
VAR_DECLS, PARM_DECLS and CONST_DECLS. The code does a pass over the body
and parameters of functions as a lint pass.

Fixes #676

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/rust/backend/rust-compile-context.h b/gcc/rust/backend/rust-compile-context.h
index 3fefd8d..4bade5c 100644
--- a/gcc/rust/backend/rust-compile-context.h
+++ b/gcc/rust/backend/rust-compile-context.h
@@ -307,6 +307,11 @@ public:
     return mangler.mangle_item (ty, path);
   }
 
+  std::vector<tree> &get_type_decls () { return type_decls; }
+  std::vector<::Bvariable *> &get_var_decls () { return var_decls; }
+  std::vector<tree> &get_const_decls () { return const_decls; }
+  std::vector<tree> &get_func_decls () { return func_decls; }
+
 private:
   ::Backend *backend;
   Resolver::Resolver *resolver;