1 files changed, 64 insertions, 0 deletions
diff --git a/gcc/rust/expand/rust-proc-macro.cc b/gcc/rust/expand/rust-proc-macro.cc
new file mode 100644
index 0000000..22744cb
--- /dev/null
+++ b/gcc/rust/expand/rust-proc-macro.cc
@@ -0,0 +1,64 @@
+// 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/>.
+
+#include "rust-diagnostics.h"
+#include "rust-proc-macro.h"
+#ifndef _WIN32
+#include <dlfcn.h>
+#endif
+
+namespace Rust {
+
+const std::string PROC_MACRO_DECL_PREFIX = "__gccrs_proc_macro_decls_";
+
+const ProcMacro::ProcmacroArray *
+load_macros_array (std::string path)
+{
+#ifndef _WIN32
+  void *handle = dlopen (path.c_str (), RTLD_LAZY | RTLD_LOCAL);
+  // We're leaking the handle since we can't ever unload it
+  if (!handle)
+    {
+      rust_debug ("Error whilst opening procedural macro: %s", dlerror ());
+      return nullptr;
+    }
+
+  // FIXME: Add CrateStableId handling, right now all versions may be loaded,
+  // even incompatible ones.
+  return *reinterpret_cast<const ProcMacro::ProcmacroArray **> (
+    dlsym (handle, PROC_MACRO_DECL_PREFIX.c_str ()));
+#else
+  rust_sorry_at (Location (),
+		 "Procedural macros are not yet supported on windows host");
+  gcc_unreachable ();
+#endif
+}
+
+const std::vector<ProcMacro::Procmacro>
+load_macros (std::string path)
+{
+  const ProcMacro::ProcmacroArray *array = load_macros_array (path);
+  // Did not load the proc macro
+  if (array == nullptr)
+    gcc_unreachable ();
+
+  rust_debug ("Found %lu procedural macros", array->length);
+
+  return std::vector<ProcMacro::Procmacro> (array->macros,
+					    array->macros + array->length);
+}
+
+} // namespace Rust