1 files changed, 85 insertions, 0 deletions
diff --git a/gcc/rust/metadata/rust-export-metadata.h b/gcc/rust/metadata/rust-export-metadata.h
new file mode 100644
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+++ b/gcc/rust/metadata/rust-export-metadata.h
@@ -0,0 +1,85 @@
+// Copyright (C) 2020-2022 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#ifndef RUST_EXPORT_METADATA_H
+#define RUST_EXPORT_METADATA_H
+
+#include "rust-system.h"
+#include "rust-hir-full-decls.h"
+#include "rust-hir-map.h"
+
+namespace Rust {
+namespace Metadata {
+
+static const char kMagicHeader[4] = {'G', 'R', 'S', 'T'};
+static const char kSzDelim[1] = {'$'};
+
+class ExportContext
+{
+public:
+  ExportContext ();
+
+  ~ExportContext ();
+
+  void push_module_scope (const HIR::Module &module);
+
+  const HIR::Module &pop_module_scope ();
+
+  void emit_trait (const HIR::Trait &trait);
+
+  void emit_function (const HIR::Function &fn);
+
+  const std::string &get_interface_buffer () const;
+
+private:
+  Analysis::Mappings *mappings;
+
+  std::vector<std::reference_wrapper<const HIR::Module>> module_stack;
+  std::string public_interface_buffer;
+};
+
+class PublicInterface
+{
+public:
+  static void Export (HIR::Crate &crate);
+
+  static void ExportTo (HIR::Crate &crate, const std::string &output_path);
+
+  static bool is_crate_public (const HIR::VisItem &item);
+
+  static std::string expected_metadata_filename ();
+
+protected:
+  void gather_export_data ();
+
+  void write_to_object_file () const;
+
+  void write_to_path (const std::string &path) const;
+
+private:
+  PublicInterface (HIR::Crate &crate);
+
+  HIR::Crate &crate;
+  Analysis::Mappings &mappings;
+  ExportContext context;
+};
+
+} // namespace Metadata
+} // namespace Rust
+
+#endif // RUST_EXPORT_METADATA_H