Subversion Repositories openrisc_2011-10-31

/* Support for printing Java values for GDB, the GNU debugger.

   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007,

   2008 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/>.  */

#include "defs.h"

#include "symtab.h"

#include "gdbtypes.h"

#include "gdbcore.h"

#include "expression.h"

#include "value.h"

#include "demangle.h"

#include "valprint.h"

#include "language.h"

#include "jv-lang.h"

#include "c-lang.h"

#include "annotate.h"

#include "gdb_string.h"

/* Local functions */

int

java_value_print (struct value *val, struct ui_file *stream, int format,

                  enum val_prettyprint pretty)

{

  struct type *type;

  CORE_ADDR address;

  int i;

  char *name;

  type = value_type (val);

  address = VALUE_ADDRESS (val) + value_offset (val);

  if (is_object_type (type))

    {

      CORE_ADDR obj_addr;

      /* Get the run-time type, and cast the object into that */

      obj_addr = unpack_pointer (type, value_contents (val));

      if (obj_addr != 0)

        {

          type = type_from_class (java_class_from_object (val));

          type = lookup_pointer_type (type);

          val = value_at (type, address);

        }

    }

  if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val))

    type_print (TYPE_TARGET_TYPE (type), "", stream, -1);

  name = TYPE_TAG_NAME (type);

  if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL

      && (i = strlen (name), name[i - 1] == ']'))

    {

      gdb_byte buf4[4];

      long length;

      unsigned int things_printed = 0;

      int reps;

      struct type *el_type = java_primitive_type_from_name (name, i - 2);

      i = 0;

      read_memory (address + JAVA_OBJECT_SIZE, buf4, 4);

      length = (long) extract_signed_integer (buf4, 4);

      fprintf_filtered (stream, "{length: %ld", length);

      if (el_type == NULL)

        {

          CORE_ADDR element;

          CORE_ADDR next_element = -1; /* dummy initial value */

          address += JAVA_OBJECT_SIZE + 4;      /* Skip object header and length. */

          while (i < length && things_printed < print_max)

            {

              gdb_byte *buf;

              buf = alloca (gdbarch_ptr_bit (current_gdbarch) / HOST_CHAR_BIT);

              fputs_filtered (", ", stream);

              wrap_here (n_spaces (2));

              if (i > 0)

                element = next_element;

              else

                {

                  read_memory (address, buf, sizeof (buf));

                  address += gdbarch_ptr_bit (current_gdbarch) / HOST_CHAR_BIT;

                  /* FIXME: cagney/2003-05-24: Bogus or what.  It

                     pulls a host sized pointer out of the target and

                     then extracts that as an address (while assuming

                     that the address is unsigned)!  */

                  element = extract_unsigned_integer (buf, sizeof (buf));

                }

              for (reps = 1; i + reps < length; reps++)

                {

                  read_memory (address, buf, sizeof (buf));

                  address += gdbarch_ptr_bit (current_gdbarch) / HOST_CHAR_BIT;

                  /* FIXME: cagney/2003-05-24: Bogus or what.  It

                     pulls a host sized pointer out of the target and

                     then extracts that as an address (while assuming

                     that the address is unsigned)!  */

                  next_element = extract_unsigned_integer (buf, sizeof (buf));

                  if (next_element != element)

                    break;

                }

              if (reps == 1)

                fprintf_filtered (stream, "%d: ", i);

              else

                fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);

              if (element == 0)

                fprintf_filtered (stream, "null");

              else

                fprintf_filtered (stream, "@%s", paddr_nz (element));

              things_printed++;

              i += reps;

            }

        }

      else

        {

          struct value *v = allocate_value (el_type);

          struct value *next_v = allocate_value (el_type);

          VALUE_ADDRESS (v) = address + JAVA_OBJECT_SIZE + 4;

          VALUE_ADDRESS (next_v) = VALUE_ADDRESS (v);

          while (i < length && things_printed < print_max)

            {

              fputs_filtered (", ", stream);

              wrap_here (n_spaces (2));

              if (i > 0)

                {

                  struct value *tmp;

                  tmp = next_v;

                  next_v = v;

                  v = tmp;

                }

              else

                {

                  set_value_lazy (v, 1);

                  set_value_offset (v, 0);

                }

              set_value_offset (next_v, value_offset (v));

              for (reps = 1; i + reps < length; reps++)

                {

                  set_value_lazy (next_v, 1);

                  set_value_offset (next_v, value_offset (next_v) + TYPE_LENGTH (el_type));

                  if (memcmp (value_contents (v), value_contents (next_v),

                              TYPE_LENGTH (el_type)) != 0)

                    break;

                }

              if (reps == 1)

                fprintf_filtered (stream, "%d: ", i);

              else

                fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);

              common_val_print (v, stream, format, 2, 1, pretty);

              things_printed++;

              i += reps;

            }

        }

      if (i < length)

        fprintf_filtered (stream, "...");

      fprintf_filtered (stream, "}");

      return 0;

    }

  /* If it's type String, print it */

  if (TYPE_CODE (type) == TYPE_CODE_PTR

      && TYPE_TARGET_TYPE (type)

      && TYPE_TAG_NAME (TYPE_TARGET_TYPE (type))

      && strcmp (TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)),

                 "java.lang.String") == 0

      && (format == 0 || format == 's')

      && address != 0

      && value_as_address (val) != 0)

    {

      struct value *data_val;

      CORE_ADDR data;

      struct value *boffset_val;

      unsigned long boffset;

      struct value *count_val;

      unsigned long count;

      struct value *mark;

      mark = value_mark ();     /* Remember start of new values */

      data_val = value_struct_elt (&val, NULL, "data", NULL, NULL);

      data = value_as_address (data_val);

      boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL);

      boffset = value_as_address (boffset_val);

      count_val = value_struct_elt (&val, NULL, "count", NULL, NULL);

      count = value_as_address (count_val);

      value_free_to_mark (mark);        /* Release unnecessary values */

      val_print_string (data + boffset, count, 2, stream);

      return 0;

    }

  return common_val_print (val, stream, format, 1, 0, pretty);

}

/* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the

   same meanings as in cp_print_value and c_val_print.

   DONT_PRINT is an array of baseclass types that we

   should not print, or zero if called from top level.  */

static void

java_print_value_fields (struct type *type, const gdb_byte *valaddr,

                         CORE_ADDR address, struct ui_file *stream,

                         int format, int recurse, enum val_prettyprint pretty)

{

  int i, len, n_baseclasses;

  CHECK_TYPEDEF (type);

  fprintf_filtered (stream, "{");

  len = TYPE_NFIELDS (type);

  n_baseclasses = TYPE_N_BASECLASSES (type);

  if (n_baseclasses > 0)

    {

      int i, n_baseclasses = TYPE_N_BASECLASSES (type);

      for (i = 0; i < n_baseclasses; i++)

        {

          int boffset;

          struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));

          char *basename = TYPE_NAME (baseclass);

          const gdb_byte *base_valaddr;

          if (BASETYPE_VIA_VIRTUAL (type, i))

            continue;

          if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)

            continue;

          boffset = 0;

          if (pretty)

            {

              fprintf_filtered (stream, "\n");

              print_spaces_filtered (2 * (recurse + 1), stream);

            }

          fputs_filtered ("<", stream);

          /* Not sure what the best notation is in the case where there is no

             baseclass name.  */

          fputs_filtered (basename ? basename : "", stream);

          fputs_filtered ("> = ", stream);

          base_valaddr = valaddr;

          java_print_value_fields (baseclass, base_valaddr, address + boffset,

                                   stream, format, recurse + 1, pretty);

          fputs_filtered (", ", stream);

        }

    }

  if (!len && n_baseclasses == 1)

    fprintf_filtered (stream, "<No data fields>");

  else

    {

      int fields_seen = 0;

      for (i = n_baseclasses; i < len; i++)

        {

          /* If requested, skip printing of static fields.  */

          if (TYPE_FIELD_STATIC (type, i))

            {

              char *name = TYPE_FIELD_NAME (type, i);

              if (!static_field_print)

                continue;

              if (name != NULL && strcmp (name, "class") == 0)

                continue;

            }

          if (fields_seen)

            fprintf_filtered (stream, ", ");

          else if (n_baseclasses > 0)

            {

              if (pretty)

                {

                  fprintf_filtered (stream, "\n");

                  print_spaces_filtered (2 + 2 * recurse, stream);

                  fputs_filtered ("members of ", stream);

                  fputs_filtered (type_name_no_tag (type), stream);

                  fputs_filtered (": ", stream);

                }

            }

          fields_seen = 1;

          if (pretty)

            {

              fprintf_filtered (stream, "\n");

              print_spaces_filtered (2 + 2 * recurse, stream);

            }

          else

            {

              wrap_here (n_spaces (2 + 2 * recurse));

            }

          if (inspect_it)

            {

              if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)

                fputs_filtered ("\"( ptr \"", stream);

              else

                fputs_filtered ("\"( nodef \"", stream);

              if (TYPE_FIELD_STATIC (type, i))

                fputs_filtered ("static ", stream);

              fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),

                                       language_cplus,

                                       DMGL_PARAMS | DMGL_ANSI);

              fputs_filtered ("\" \"", stream);

              fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),

                                       language_cplus,

                                       DMGL_PARAMS | DMGL_ANSI);

              fputs_filtered ("\") \"", stream);

            }

          else

            {

              annotate_field_begin (TYPE_FIELD_TYPE (type, i));

              if (TYPE_FIELD_STATIC (type, i))

                fputs_filtered ("static ", stream);

              fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),

                                       language_cplus,

                                       DMGL_PARAMS | DMGL_ANSI);

              annotate_field_name_end ();

              fputs_filtered (": ", stream);

              annotate_field_value ();

            }

          if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))

            {

              struct value *v;

              /* Bitfields require special handling, especially due to byte

                 order problems.  */

              if (TYPE_FIELD_IGNORE (type, i))

                {

                  fputs_filtered ("<optimized out or zero length>", stream);

                }

              else

                {

                  v = value_from_longest (TYPE_FIELD_TYPE (type, i),

                                   unpack_field_as_long (type, valaddr, i));

                  common_val_print (v, stream, format, 0, recurse + 1, pretty);

                }

            }

          else

            {

              if (TYPE_FIELD_IGNORE (type, i))

                {

                  fputs_filtered ("<optimized out or zero length>", stream);

                }

              else if (TYPE_FIELD_STATIC (type, i))

                {

                  struct value *v = value_static_field (type, i);

                  if (v == NULL)

                    fputs_filtered ("<optimized out>", stream);

                  else

                    {

                      struct type *t = check_typedef (value_type (v));

                      if (TYPE_CODE (t) == TYPE_CODE_STRUCT)

                        v = value_addr (v);

                      common_val_print (v, stream, format, 0, recurse + 1,

                                        pretty);

                    }

                }

              else if (TYPE_FIELD_TYPE (type, i) == NULL)

                fputs_filtered ("<unknown type>", stream);

              else

                {

                  val_print (TYPE_FIELD_TYPE (type, i),

                             valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0,

                             address + TYPE_FIELD_BITPOS (type, i) / 8,

                             stream, format, 0, recurse + 1, pretty);

                }

            }

          annotate_field_end ();

        }

      if (pretty)

        {

          fprintf_filtered (stream, "\n");

          print_spaces_filtered (2 * recurse, stream);

        }

    }

  fprintf_filtered (stream, "}");

}

/* Print data of type TYPE located at VALADDR (within GDB), which came from

   the inferior at address ADDRESS, onto stdio stream STREAM according to

   FORMAT (a letter or 0 for natural format).  The data at VALADDR is in

   target byte order.

   If the data are a string pointer, returns the number of string characters

   printed.

   If DEREF_REF is nonzero, then dereference references, otherwise just print

   them like pointers.

   The PRETTY parameter controls prettyprinting.  */

int

java_val_print (struct type *type, const gdb_byte *valaddr,

                int embedded_offset, CORE_ADDR address,

                struct ui_file *stream, int format, int deref_ref,

                int recurse, enum val_prettyprint pretty)

{

  unsigned int i = 0;    /* Number of characters printed */

  struct type *target_type;

  CORE_ADDR addr;

  CHECK_TYPEDEF (type);

  switch (TYPE_CODE (type))

    {

    case TYPE_CODE_PTR:

      if (format && format != 's')

        {

          print_scalar_formatted (valaddr, type, format, 0, stream);

          break;

        }

#if 0

      if (vtblprint && cp_is_vtbl_ptr_type (type))

        {

          /* Print the unmangled name if desired.  */

          /* Print vtable entry - we only get here if we ARE using

             -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */

          /* Extract an address, assume that it is unsigned.  */

          print_address_demangle (extract_unsigned_integer (valaddr, TYPE_LENGTH (type)),

                                  stream, demangle);

          break;

        }

#endif

      addr = unpack_pointer (type, valaddr);

      if (addr == 0)

        {

          fputs_filtered ("null", stream);

          return i;

        }

      target_type = check_typedef (TYPE_TARGET_TYPE (type));

      if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)

        {

          /* Try to print what function it points to.  */

          print_address_demangle (addr, stream, demangle);

          /* Return value is irrelevant except for string pointers.  */

          return (0);

        }

      if (addressprint && format != 's')

        {

          fputs_filtered ("@", stream);

          print_longest (stream, 'x', 0, (ULONGEST) addr);

        }

      return i;

    case TYPE_CODE_CHAR:

    case TYPE_CODE_INT:

      /* Can't just call c_val_print because that prints bytes as C

         chars.  */

      format = format ? format : output_format;

      if (format)

        print_scalar_formatted (valaddr, type, format, 0, stream);

      else if (TYPE_CODE (type) == TYPE_CODE_CHAR

               || (TYPE_CODE (type) == TYPE_CODE_INT

                   && TYPE_LENGTH (type) == 2

                   && strcmp (TYPE_NAME (type), "char") == 0))

        LA_PRINT_CHAR ((int) unpack_long (type, valaddr), stream);

      else

        val_print_type_code_int (type, valaddr, stream);

      break;

    case TYPE_CODE_STRUCT:

      java_print_value_fields (type, valaddr, address, stream, format,

                               recurse, pretty);

      break;

    default:

      return c_val_print (type, valaddr, embedded_offset, address, stream,

                          format, deref_ref, recurse, pretty);

    }

  return 0;

}