2 files changed, 131 insertions, 0 deletions
diff --git a/gcc/rust/util/rust-attributes.cc b/gcc/rust/util/rust-attributes.cc
new file mode 100644
index 0000000..3809ad7
--- /dev/null
+++ b/gcc/rust/util/rust-attributes.cc
@@ -0,0 +1,61 @@
+// 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/>.
+
+#include "rust-attributes.h"
+
+namespace Rust {
+namespace Analysis {
+
+// https://doc.rust-lang.org/stable/nightly-rustc/src/rustc_feature/builtin_attrs.rs.html#256
+static const BuiltinAttrDefinition __definitions[] = {
+  {"inline", CODE_GENERATION}, {"cfg", EXPANSION},     {"cfg_attr", EXPANSION},
+  {"allow", STATIC_ANALYSIS},  {"lang", HIR_LOWERING},
+};
+
+BuiltinAttributeMappings *
+BuiltinAttributeMappings::get ()
+{
+  static BuiltinAttributeMappings *instance = nullptr;
+  if (instance == nullptr)
+    instance = new BuiltinAttributeMappings ();
+
+  return instance;
+}
+
+const BuiltinAttrDefinition &
+BuiltinAttributeMappings::lookup_builtin (const std::string &attr_name) const
+{
+  auto it = mappings.find (attr_name);
+  if (it == mappings.end ())
+    return BuiltinAttrDefinition::error_node ();
+
+  return it->second;
+}
+
+BuiltinAttributeMappings::BuiltinAttributeMappings ()
+{
+  size_t ndefinitions = sizeof (__definitions) / sizeof (BuiltinAttrDefinition);
+  for (size_t i = 0; i < ndefinitions; i++)
+    {
+      const BuiltinAttrDefinition &def = __definitions[i];
+      mappings.insert ({def.name, def});
+    }
+}
+
+} // namespace Analysis
+} // namespace Rust
diff --git a/gcc/rust/util/rust-attributes.h b/gcc/rust/util/rust-attributes.h
new file mode 100644
index 0000000..6c2063c7
--- /dev/null
+++ b/gcc/rust/util/rust-attributes.h
@@ -0,0 +1,70 @@
+// 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/>.
+
+#include "rust-system.h"
+
+namespace Rust {
+namespace Analysis {
+
+enum CompilerPass
+{
+  UNKNOWN,
+
+  EXPANSION,
+  NAME_RESOLUTION,
+  HIR_LOWERING,
+  TYPE_CHECK,
+  STATIC_ANALYSIS,
+  CODE_GENERATION
+};
+
+struct BuiltinAttrDefinition
+{
+  std::string name;
+  CompilerPass handler;
+
+  static BuiltinAttrDefinition get_error ()
+  {
+    return BuiltinAttrDefinition{"", UNKNOWN};
+  }
+
+  static BuiltinAttrDefinition &error_node ()
+  {
+    static BuiltinAttrDefinition error_node = get_error ();
+    return error_node;
+  }
+
+  bool is_error () const { return name.empty (); }
+};
+
+class BuiltinAttributeMappings
+{
+public:
+  static BuiltinAttributeMappings *get ();
+
+  const BuiltinAttrDefinition &
+  lookup_builtin (const std::string &attr_name) const;
+
+private:
+  BuiltinAttributeMappings ();
+
+  std::map<std::string, const BuiltinAttrDefinition> mappings;
+};
+
+} // namespace Analysis
+} // namespace Rust