Add Go frontend, libgo library, and Go testsuite.

gcc/:
	* gcc.c (default_compilers): Add entry for ".go".
	* common.opt: Add -static-libgo as a driver option.
	* doc/install.texi (Configuration): Mention libgo as an option for
	--enable-shared.  Mention go as an option for --enable-languages.
	* doc/invoke.texi (Overall Options): Mention .go as a file name
	suffix.  Mention go as a -x option.
	* doc/frontends.texi (G++ and GCC): Mention Go as a supported
	language.
	* doc/sourcebuild.texi (Top Level): Mention libgo.
	* doc/standards.texi (Standards): Add section on Go language.
	Move references for other languages into their own section.
	* doc/contrib.texi (Contributors): Mention that I contributed the
	Go frontend.
gcc/testsuite/:
	* lib/go.exp: New file.
	* lib/go-dg.exp: New file.
	* lib/go-torture.exp: New file.
	* lib/target-supports.exp (check_compile): Match // Go.

From-SVN: r167407

1 files changed, 57 insertions, 0 deletions

diff --git a/libgo/runtime/interface.h b/libgo/runtime/interface.h
new file mode 100644
index 0000000..610f208
--- /dev/null
+++ b/libgo/runtime/interface.h
@@ -0,0 +1,57 @@
+/* interface.h -- the interface type for Go.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#ifndef LIBGO_INTERFACE_H
+#define LIBGO_INTERFACE_H
+
+#include "go-type.h"
+
+/* A variable of interface type is an instance of this struct, if the
+   interface has any methods.  */
+
+struct __go_interface
+{
+  /* A pointer to the interface method table.  The first pointer is
+     the type descriptor of the object.  Subsequent pointers are
+     pointers to functions.  This is effectively the vtable for this
+     interface.  The function pointers are in the same order as the
+     list in the internal representation of the interface, which sorts
+     them by name.  */
+  const void **__methods;
+
+  /* The object.  If the object is a pointer--if the type descriptor
+     code is GO_PTR or GO_UNSAFE_POINTER--then this field is the value
+     of the object itself.  Otherwise this is a pointer to memory
+     which holds the value.  */
+  void *__object;
+};
+
+/* A variable of an empty interface type is an instance of this
+   struct.  */
+
+struct __go_empty_interface
+{
+  /* The type descriptor of the object.  */
+  const struct __go_type_descriptor *__type_descriptor;
+
+  /* The object.  This is the same as __go_interface above.  */
+  void *__object;
+};
+
+extern void *
+__go_convert_interface (const struct __go_type_descriptor *,
+			const struct __go_type_descriptor *);
+
+extern void *
+__go_convert_interface_2 (const struct __go_type_descriptor *,
+			  const struct __go_type_descriptor *,
+			  _Bool may_fail);
+
+extern _Bool
+__go_can_convert_to_interface(const struct __go_type_descriptor *,
+			      const struct __go_type_descriptor *);
+
+#endif /* !defined(LIBGO_INTERFACE_H) */