expand: Add procmacro loading function

Add a function to load a shared object procmacro and retrieve the list
of available procedural macros.

gcc/rust/ChangeLog:

	* Make-lang.in: Add rust-proc-macro object to list.
	* expand/rust-proc-macro.cc: New file.
	* expand/rust-proc-macro.h: New file.

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

1 files changed, 34 insertions, 0 deletions

diff --git a/gcc/rust/expand/rust-proc-macro.h b/gcc/rust/expand/rust-proc-macro.h
new file mode 100644
index 0000000..779d3c7
--- /dev/null
+++ b/gcc/rust/expand/rust-proc-macro.h
@@ -0,0 +1,34 @@
+// 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_PROC_MACRO_H
+#define RUST_PROC_MACRO_H
+
+#include "libproc_macro/proc_macro.h"
+
+namespace Rust {
+
+/**
+ * Load a procedural macro library and return a pointer to it's entrypoint.
+ *
+ * @param The path to the shared object file to load.
+ */
+const std::vector<ProcMacro::Procmacro>
+load_macros (std::string path);
+
+} // namespace Rust
+
+#endif /* ! RUST_PROC_MACRO_H */