Merge GDB 7.5.1

gdb/go-valprint.c

+/* 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);
+      fputs_filtered (" ", 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;
+    }
+}