Initial pass at Go language support.

	* NEWS: Mention Go.
	* Makefile.in (SFILES): Add go-exp.y, go-lang.c, go-typeprint.c,
	go-valprint.c.
	(COMMON_OBS): Add go-lang.o, go-val.print.o, go-typeprint.o.
	(YYFILES): Add go-exp.c.
	(YYOBJ): Add go-exp.o.
	(local-maintainer-clean): Delete go-exp.c.
	* defs.h (enum language): Add language_go.
	* dwarf2read.c: #include "go-lang.h".
	(fixup_go_packaging): New function.
	(process_full_comp_unit): Call it when processing Go CUs.
	(dwarf2_physname): Add Go support.
	(read_file_scope): Handle missing language spec for GNU Go.
	(set_cu_language): Handle DW_LANG_Go.
	* go-exp.y: New file.
	* go-lang.h: New file.
	* go-lang.c: New file.
	* go-typeprint.c: New file.
	* go-valprint.c: New file.
	* symtab.c: #include "go-lang.h".
	(symbol_set_language): Handle language_go.
	(symbol_find_demangled_name, symbol_set_names): Ditto.
	(symbol_natural_name, demangle_for_lookup, find_main_name): Ditto.

	testsuite/
	* configure.ac: Create gdb.go/Makefile.
	* configure: Regenerate.
	* gdb.base/default.exp: Add "go" to "set language" testing.
	* gdb.go/Makefile.in: New file.
	* gdb.go/basic-types.exp: New file.
	* gdb.go/chan.exp: New file.
	* gdb.go/chan.go: New file.
	* gdb.go/handcall.exp: New file.
	* gdb.go/handcall.go: New file.
	* gdb.go/hello.exp: New file.
	* gdb.go/hello.go: New file.
	* gdb.go/integers.exp: New file.
	* gdb.go/integers.go: New file.
	* gdb.go/methods.exp: New file.
	* gdb.go/methods.go: New file.
	* gdb.go/package.exp: New file.
	* gdb.go/package1.go: New file.
	* gdb.go/package2.go: New file.
	* gdb.go/print.exp: New file.
	* gdb.go/strings.exp: New file.
	* gdb.go/strings.go: New file.
	* gdb.go/types.exp: New file.
	* gdb.go/types.go: New file.
	* gdb.go/unsafe.exp: New file.
	* gdb.go/unsafe.go: New file.
	* lib/future.exp: Add Go support.
	(gdb_find_go, gdb_find_go_linker): New procs.
	(gdb_default_target_compile): Add Go support.
	* lib/gdb.exp (skip_go_tests): New proc.
	* lib/go.exp: New file.

	doc/
	* gdb.texinfo (Supported Languages): Add Go.
	(Go): New node.

1 files changed, 120 insertions, 0 deletions

diff --git a/gdb/go-valprint.c b/gdb/go-valprint.c
new file mode 100644
index 0000000..3be4927
--- /dev/null
+++ b/gdb/go-valprint.c
@@ -0,0 +1,120 @@
+/* Support for printing Go values for GDB, the GNU debugger.
+
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   NOTE: This currently only provides special support for printing gccgo
+   strings.  6g objects are handled in Python.
+   The remaining gccgo types may also be handled in Python.
+   Strings are handled specially here, at least for now, in case the Python
+   support is unavailable.  */
+
+#include "defs.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+#include "go-lang.h"
+#include "c-lang.h"
+#include "valprint.h"
+
+/* Print a Go string.
+
+   Note: We assume
+   gdb_assert (go_classify_struct_type (type) == GO_TYPE_STRING).  */
+
+static void
+print_go_string (struct type *type, const gdb_byte *valaddr,
+		 int embedded_offset, CORE_ADDR address,
+		 struct ui_file *stream, int recurse,
+		 const struct value *val,
+		 const struct value_print_options *options)
+{
+  struct gdbarch *gdbarch = get_type_arch (type);
+  struct type *elt_ptr_type = TYPE_FIELD_TYPE (type, 0);
+  struct type *elt_type = TYPE_TARGET_TYPE (elt_ptr_type);
+  LONGEST length;
+  /* TODO(dje): The encapsulation of what a pointer is belongs in value.c.
+     I.e. If there's going to be unpack_pointer, there should be
+     unpack_value_field_as_pointer.  Do this until we can get
+     unpack_value_field_as_pointer.  */
+  LONGEST addr;
+
+  gdb_assert (valaddr == value_contents_for_printing_const (val));
+
+  if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 0,
+				    val, &addr))
+    error (_("Unable to read string address"));
+
+  if (! unpack_value_field_as_long (type, valaddr, embedded_offset, 1,
+				    val, &length))
+    error (_("Unable to read string length"));
+
+  /* TODO(dje): Print address of struct or actual string?  */
+  if (options->addressprint)
+    fputs_filtered (paddress (gdbarch, addr), stream);
+
+  if (length < 0)
+    {
+      fputs_filtered (_("<invalid length: "), stream);
+      fputs_filtered (plongest (addr), stream);
+      fputs_filtered (">", stream);
+      return;
+    }
+
+  /* TODO(dje): Perhaps we should pass "UTF8" for ENCODING.
+     The target encoding is a global switch.
+     Either choice is problematic.  */
+  val_print_string (elt_type, NULL, addr, length, stream, options);
+}
+
+/* Implements the la_val_print routine for language Go.  */
+
+void
+go_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
+	      CORE_ADDR address, struct ui_file *stream, int recurse,
+	      const struct value *val,
+	      const struct value_print_options *options)
+{
+  CHECK_TYPEDEF (type);
+
+  switch (TYPE_CODE (type))
+    {
+      case TYPE_CODE_STRUCT:
+	{
+	  enum go_type go_type = go_classify_struct_type (type);
+
+	  switch (go_type)
+	    {
+	    case GO_TYPE_STRING:
+	      if (! options->raw)
+		{
+		  print_go_string (type, valaddr, embedded_offset, address,
+				   stream, recurse, val, options);
+		  return;
+		}
+	      break;
+	    default:
+	      break;
+	    }
+	}
+	/* Fall through.  */
+
+      default:
+	c_val_print (type, valaddr, embedded_offset, address, stream,
+		     recurse, val, options);
+	break;
+    }
+}