1 files changed, 93 insertions, 0 deletions
diff --git a/gcc/go/go-backend.c b/gcc/go/go-backend.c
new file mode 100644
index 000000000..5ecc99bb1
--- /dev/null
+++ b/gcc/go/go-backend.c
@@ -0,0 +1,93 @@
+/* go-backend.c -- Go frontend interface to gcc backend.
+   Copyright (C) 2010, 2011 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 "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "tree.h"
+#include "tm_p.h"
+#include "target.h"
+
+#include "go-c.h"
+
+/* This file holds all the cases where the Go frontend needs
+   information from gcc's backend.  */
+
+/* Return the alignment in bytes of a value of type T.  */
+
+unsigned int
+go_type_alignment (tree t)
+{
+  return TYPE_ALIGN_UNIT (t);
+}
+
+/* Return the alignment in bytes of a struct field of type T.  */
+
+unsigned int
+go_field_alignment (tree t)
+{
+  unsigned int v;
+
+  v = TYPE_ALIGN (t);
+
+#ifdef BIGGEST_FIELD_ALIGNMENT
+  if (v > BIGGEST_FIELD_ALIGNMENT)
+    v = BIGGEST_FIELD_ALIGNMENT;
+#endif
+
+#ifdef ADJUST_FIELD_ALIGN
+  {
+    tree field ATTRIBUTE_UNUSED;
+    field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, NULL, t);
+    v = ADJUST_FIELD_ALIGN (field, v);
+  }
+#endif
+
+  return v / BITS_PER_UNIT;
+}
+
+/* Return the size and alignment of a trampoline.  */
+
+void
+go_trampoline_info (unsigned int *size, unsigned int *alignment)
+{
+  *size = TRAMPOLINE_SIZE;
+  *alignment = TRAMPOLINE_ALIGNMENT;
+}
+
+/* This is called by the Go frontend proper if the unsafe package was
+   imported.  When that happens we can not do type-based alias
+   analysis.  */
+
+void
+go_imported_unsafe (void)
+{
+  flag_strict_aliasing = false;
+
+  /* This is a real hack.  init_varasm_once has already grabbed an
+     alias set, which we don't want when we aren't doing strict
+     aliasing.  We reinitialize to make it do it again.  This should
+     be OK in practice since we haven't really done anything yet.  */
+  init_varasm_once ();
+
+  /* Let the backend know that the options have changed.  */
+  targetm.override_options_after_change ();
+}