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, 188 insertions, 0 deletions

diff --git a/libgo/runtime/go-reflect.c b/libgo/runtime/go-reflect.c
new file mode 100644
index 0000000..e608df7
--- /dev/null
+++ b/libgo/runtime/go-reflect.c
@@ -0,0 +1,188 @@
+/* go-reflect.c -- implement unsafe.Reflect and unsafe.Typeof 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.  */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "interface.h"
+#include "go-alloc.h"
+#include "go-panic.h"
+#include "go-string.h"
+#include "go-type.h"
+
+/* For field alignment.  */
+
+struct field_align
+{
+  char c;
+  struct __go_type_descriptor *p;
+};
+
+/* The type descriptors in the runtime package.  */
+
+extern const struct __go_type_descriptor ptr_bool_descriptor
+  asm ("__go_td_pN30_libgo_runtime.runtime.BoolType");
+extern const struct __go_type_descriptor ptr_float_descriptor
+  asm ("__go_td_pN31_libgo_runtime.runtime.FloatType");
+extern const struct __go_type_descriptor ptr_complex_descriptor
+  asm ("__go_td_pN33_libgo_runtime.runtime.ComplexType");
+extern const struct __go_type_descriptor ptr_int_descriptor
+  asm ("__go_td_pN29_libgo_runtime.runtime.IntType");
+extern const struct __go_type_descriptor ptr_uint_descriptor
+  asm ("__go_td_pN30_libgo_runtime.runtime.UintType");
+extern const struct __go_type_descriptor ptr_string_descriptor
+  asm ("__go_td_pN32_libgo_runtime.runtime.StringType");
+extern const struct __go_type_descriptor ptr_unsafe_pointer_decriptor
+  asm ("__go_td_pN39_libgo_runtime.runtime.UnsafePointerType");
+extern const struct __go_type_descriptor ptr_array_descriptor
+  asm ("__go_td_pN31_libgo_runtime.runtime.ArrayType");
+extern const struct __go_type_descriptor ptr_slice_descriptor
+  asm ("__go_td_pN31_libgo_runtime.runtime.SliceType");
+extern const struct __go_type_descriptor ptr_chan_descriptor
+  asm ("__go_td_pN30_libgo_runtime.runtime.ChanType");
+extern const struct __go_type_descriptor ptr_func_descriptor
+  asm ("__go_td_pN30_libgo_runtime.runtime.FuncType");
+extern const struct __go_type_descriptor ptr_interface_descriptor
+  asm ("__go_td_pN35_libgo_runtime.runtime.InterfaceType");
+extern const struct __go_type_descriptor ptr_map_descriptor
+  asm ("__go_td_pN29_libgo_runtime.runtime.MapType");
+extern const struct __go_type_descriptor ptr_ptr_descriptor
+  asm ("__go_td_pN29_libgo_runtime.runtime.PtrType");
+extern const struct __go_type_descriptor ptr_struct_descriptor
+  asm ("__go_td_pN32_libgo_runtime.runtime.StructType");
+
+const struct __go_type_descriptor *
+get_descriptor (int code)
+{
+  switch (code)
+    {
+    case GO_BOOL:
+      return &ptr_bool_descriptor;
+    case GO_FLOAT32:
+    case GO_FLOAT64:
+    case GO_FLOAT:
+      return &ptr_float_descriptor;
+    case GO_COMPLEX64:
+    case GO_COMPLEX128:
+    case GO_COMPLEX:
+      return &ptr_complex_descriptor;
+    case GO_INT16:
+    case GO_INT32:
+    case GO_INT64:
+    case GO_INT8:
+    case GO_INT:
+      return &ptr_int_descriptor;
+    case GO_UINT16:
+    case GO_UINT32:
+    case GO_UINT64:
+    case GO_UINT8:
+    case GO_UINTPTR:
+    case GO_UINT:
+      return &ptr_uint_descriptor;
+    case GO_STRING:
+      return &ptr_string_descriptor;
+    case GO_UNSAFE_POINTER:
+      return &ptr_unsafe_pointer_decriptor;
+    case GO_ARRAY:
+      return &ptr_array_descriptor;
+    case GO_SLICE:
+      return &ptr_slice_descriptor;
+    case GO_CHAN:
+      return &ptr_chan_descriptor;
+    case GO_FUNC:
+      return &ptr_func_descriptor;
+    case GO_INTERFACE:
+      return &ptr_interface_descriptor;
+    case GO_MAP:
+      return &ptr_map_descriptor;
+    case GO_PTR:
+      return &ptr_ptr_descriptor;
+    case GO_STRUCT:
+      return &ptr_struct_descriptor;
+    default:
+      abort ();
+    }
+}
+
+/* Implement unsafe.Reflect.  */
+
+struct reflect_ret
+{
+  struct __go_empty_interface rettype;
+  void *addr;
+};
+
+struct reflect_ret Reflect (struct __go_empty_interface)
+  asm ("libgo_unsafe.unsafe.Reflect");
+
+struct reflect_ret
+Reflect (struct __go_empty_interface e)
+{
+  struct reflect_ret ret;
+
+  if (e.__type_descriptor == NULL)
+    {
+      ret.rettype.__type_descriptor = NULL;
+      ret.rettype.__object = NULL;
+      ret.addr = NULL;
+    }
+  else
+    {
+      size_t size;
+
+      ret.rettype.__type_descriptor =
+	get_descriptor (e.__type_descriptor->__code);
+
+      /* This memcpy is really just an assignment of a const pointer
+	 to a non-const pointer.  FIXME: We should canonicalize this
+	 pointer, so that for a given type we always return the same
+	 pointer.  */
+      __builtin_memcpy (&ret.rettype.__object, &e.__type_descriptor,
+			sizeof (void *));
+
+      /* Make a copy of the value.  */
+      size = e.__type_descriptor->__size;
+      if (size <= sizeof (uint64_t))
+	ret.addr = __go_alloc (sizeof (uint64_t));
+      else
+	ret.addr = __go_alloc (size);
+      if (__go_is_pointer_type (e.__type_descriptor))
+	*(void **) ret.addr = e.__object;
+      else
+	__builtin_memcpy (ret.addr, e.__object, size);
+    }
+
+  return ret;
+}
+
+/* Implement unsafe.Typeof.  */
+
+struct __go_empty_interface Typeof (struct __go_empty_interface)
+  asm ("libgo_unsafe.unsafe.Typeof");
+
+struct __go_empty_interface
+Typeof (const struct __go_empty_interface e)
+{
+  struct __go_empty_interface ret;
+
+  if (e.__type_descriptor == NULL)
+    {
+      ret.__type_descriptor = NULL;
+      ret.__object = NULL;
+    }
+  else
+    {
+      ret.__type_descriptor = get_descriptor (e.__type_descriptor->__code);
+
+      /* This memcpy is really just an assignment of a const pointer
+	 to a non-const pointer.  FIXME: We should canonicalize this
+	 pointer, so that for a given type we always return the same
+	 pointer.  */
+      __builtin_memcpy (&ret.__object, &e.__type_descriptor, sizeof (void *));
+    }
+
+  return ret;
+}