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/* Abstraction of HP aCC ABI.

   Contributed by Daniel Berlin <dberlin@redhat.com>

   Most of the real code is from HP, i've just fiddled it to fit in

   the C++ ABI abstraction framework.

   Copyright 2001 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "value.h"

#include "gdb_regex.h"

#include "gdb_string.h"

#include "gdbtypes.h"

#include "gdbcore.h"

#include "cp-abi.h"

struct cp_abi_ops hpacc_abi_ops;

/* It appears the is_*_name stuff is never used when we try the hpACC

 * ABI. As such, I have no clue what the real answers are. Shouldn't

 * have any more effect than it does now.  */

static regex_t constructor_pattern;

static regex_t destructor_pattern;

static regex_t operator_pattern;

static enum dtor_kinds

hpacc_is_destructor_name (const char *name)

{

  if (regexec (&destructor_pattern, name, 0, 0, 0) == 0)

    return complete_object_dtor;

  else

    return 0;

}

static enum ctor_kinds

hpacc_is_constructor_name (const char *name)

{

  if (regexec (&constructor_pattern, name, 0, 0, 0) == 0)

    return complete_object_ctor;

  else

    return 0;

}

static int

hpacc_is_operator_name (const char *name)

{

  return regexec (&operator_pattern, name, 0, 0, 0) == 0;

}

static int

hpacc_is_vtable_name (const char *name)

{

  return strcmp (name,

                 "This will never match anything, please fill it in") == 0;

}

/* Return a virtual function as a value.

   ARG1 is the object which provides the virtual function

   table pointer.  *ARG1P is side-effected in calling this function.

   F is the list of member functions which contains the desired virtual

   function.

   J is an index into F which provides the desired virtual function.

   TYPE is the type in which F is located.  */

static struct value *

hpacc_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,

                        struct type * type, int offset)

{

  struct value *arg1 = *arg1p;

  struct type *type1 = check_typedef (VALUE_TYPE (arg1));

  /* Deal with HP/Taligent runtime model for virtual functions */

  struct value *vp;

  struct value *argp;           /* arg1 cast to base */

  CORE_ADDR coreptr;            /* pointer to target address */

  int class_index;              /* which class segment pointer to use */

  struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);       /* method type */

  argp = value_cast (type, *arg1p);

  if (VALUE_ADDRESS (argp) == 0)

    error ("Address of object is null; object may not have been created.");

  /* pai: FIXME -- 32x64 possible problem? */

  /* First word (4 bytes) in object layout is the vtable pointer */

  coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (argp));     /* pai: (temp)  */

  /* + offset + VALUE_EMBEDDED_OFFSET (argp)); */

  if (!coreptr)

    error

      ("Virtual table pointer is null for object; object may not have been created.");

  /* pai/1997-05-09

   * FIXME: The code here currently handles only

   * the non-RRBC case of the Taligent/HP runtime spec; when RRBC

   * is introduced, the condition for the "if" below will have to

   * be changed to be a test for the RRBC case.  */

  if (1)

    {

      /* Non-RRBC case; the virtual function pointers are stored at fixed

       * offsets in the virtual table. */

      /* Retrieve the offset in the virtual table from the debug

       * info.  The offset of the vfunc's entry is in words from

       * the beginning of the vtable; but first we have to adjust

       * by HP_ACC_VFUNC_START to account for other entries */

      /* pai: FIXME: 32x64 problem here, a word may be 8 bytes in

       * which case the multiplier should be 8 and values should be long */

      vp = value_at (builtin_type_int,

                     coreptr + 4 * (TYPE_FN_FIELD_VOFFSET (f, j) +

                                    HP_ACC_VFUNC_START), NULL);

      coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));

      /* coreptr now contains the address of the virtual function */

      /* (Actually, it contains the pointer to the plabel for the function. */

    }

  else

    {

      /* RRBC case; the virtual function pointers are found by double

       * indirection through the class segment tables. */

      /* Choose class segment depending on type we were passed */

      class_index = class_index_in_primary_list (type);

      /* Find class segment pointer.  These are in the vtable slots after

       * some other entries, so adjust by HP_ACC_VFUNC_START for that. */

      /* pai: FIXME 32x64 problem here, if words are 8 bytes long

       * the multiplier below has to be 8 and value should be long. */

      vp = value_at (builtin_type_int,

                     coreptr + 4 * (HP_ACC_VFUNC_START + class_index), NULL);

      /* Indirect once more, offset by function index */

      /* pai: FIXME 32x64 problem here, again multiplier could be 8 and value long */

      coreptr =

        *(CORE_ADDR *) (VALUE_CONTENTS (vp) +

                        4 * TYPE_FN_FIELD_VOFFSET (f, j));

      vp = value_at (builtin_type_int, coreptr, NULL);

      coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));

      /* coreptr now contains the address of the virtual function */

      /* (Actually, it contains the pointer to the plabel for the function.) */

    }

  if (!coreptr)

    error ("Address of virtual function is null; error in virtual table?");

  /* Wrap this addr in a value and return pointer */

  vp = allocate_value (ftype);

  VALUE_TYPE (vp) = ftype;

  VALUE_ADDRESS (vp) = coreptr;

  /* pai: (temp) do we need the value_ind stuff in value_fn_field? */

  return vp;

}

static struct type *

hpacc_value_rtti_type (struct value *v, int *full, int *top, int *using_enc)

{

  struct type *known_type;

  struct type *rtti_type;

  CORE_ADDR coreptr;

  struct value *vp;

  int using_enclosing = 0;

  long top_offset = 0;

  char rtti_type_name[256];

  if (full)

    *full = 0;

  if (top)

    *top = -1;

  if (using_enc)

    *using_enc = 0;

  /* Get declared type */

  known_type = VALUE_TYPE (v);

  CHECK_TYPEDEF (known_type);

  /* RTTI works only or class objects */

  if (TYPE_CODE (known_type) != TYPE_CODE_CLASS)

    return NULL;

  /* If neither the declared type nor the enclosing type of the

   * value structure has a HP ANSI C++ style virtual table,

   * we can't do anything. */

  if (!TYPE_HAS_VTABLE (known_type))

    {

      known_type = VALUE_ENCLOSING_TYPE (v);

      CHECK_TYPEDEF (known_type);

      if ((TYPE_CODE (known_type) != TYPE_CODE_CLASS) ||

          !TYPE_HAS_VTABLE (known_type))

        return NULL;            /* No RTTI, or not HP-compiled types */

      CHECK_TYPEDEF (known_type);

      using_enclosing = 1;

    }

  if (using_enclosing && using_enc)

    *using_enc = 1;

  /* First get the virtual table address */

  coreptr = *(CORE_ADDR *) ((VALUE_CONTENTS_ALL (v))

                            + VALUE_OFFSET (v)

                            + (using_enclosing

                               ? 0

                               : VALUE_EMBEDDED_OFFSET (v)));

  if (coreptr == 0)

    /* return silently -- maybe called on gdb-generated value */

    return NULL;

  /* Fetch the top offset of the object */

  /* FIXME possible 32x64 problem with pointer size & arithmetic */

  vp = value_at (builtin_type_int,

                 coreptr + 4 * HP_ACC_TOP_OFFSET_OFFSET,

                 VALUE_BFD_SECTION (v));

  top_offset = value_as_long (vp);

  if (top)

    *top = top_offset;

  /* Fetch the typeinfo pointer */

  /* FIXME possible 32x64 problem with pointer size & arithmetic */

  vp = value_at (builtin_type_int, coreptr + 4 * HP_ACC_TYPEINFO_OFFSET,

                 VALUE_BFD_SECTION (v));

  /* Indirect through the typeinfo pointer and retrieve the pointer

   * to the string name */

  coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));

  if (!coreptr)

    error ("Retrieved null typeinfo pointer in trying to determine "

           "run-time type");

  /* 4 -> offset of name field */

  vp = value_at (builtin_type_int, coreptr + 4, VALUE_BFD_SECTION (v));

  /* FIXME possible 32x64 problem */

  coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));

  read_memory_string (coreptr, rtti_type_name, 256);

  if (strlen (rtti_type_name) == 0)

    error ("Retrieved null type name from typeinfo");

  /* search for type */

  rtti_type = lookup_typename (rtti_type_name, (struct block *) 0, 1);

  if (!rtti_type)

    error ("Could not find run-time type: invalid type name %s in typeinfo??",

           rtti_type_name);

  CHECK_TYPEDEF (rtti_type);

#if 0

  printf ("RTTI type name %s, tag %s, full? %d\n", TYPE_NAME (rtti_type),

          TYPE_TAG_NAME (rtti_type), full ? *full : -1);

#endif

  /* Check whether we have the entire object */

  if (full                      /* Non-null pointer passed */

      &&

      /* Either we checked on the whole object in hand and found the

         top offset to be zero */

      (((top_offset == 0) &&

        using_enclosing &&

        TYPE_LENGTH (known_type) == TYPE_LENGTH (rtti_type))

       ||

       /* Or we checked on the embedded object and top offset was the

          same as the embedded offset */

       ((top_offset == VALUE_EMBEDDED_OFFSET (v)) &&

        !using_enclosing &&

        TYPE_LENGTH (VALUE_ENCLOSING_TYPE (v)) == TYPE_LENGTH (rtti_type))))

    *full = 1;

  return rtti_type;

}

extern int gnuv2_baseclass_offset (struct type *type, int index,

                                   char *valaddr, CORE_ADDR address);

static void

init_hpacc_ops (void)

{

  hpacc_abi_ops.shortname = "hpaCC";

  hpacc_abi_ops.longname = "HP aCC ABI";

  hpacc_abi_ops.doc = "HP aCC ABI";

  hpacc_abi_ops.is_destructor_name = hpacc_is_destructor_name;

  hpacc_abi_ops.is_constructor_name = hpacc_is_constructor_name;

  hpacc_abi_ops.is_vtable_name = hpacc_is_vtable_name;

  hpacc_abi_ops.is_operator_name = hpacc_is_operator_name;

  hpacc_abi_ops.virtual_fn_field = hpacc_virtual_fn_field;

  hpacc_abi_ops.rtti_type = hpacc_value_rtti_type;

  /* It seems that this function is specific to GNU G++ < 3.0.

     However, it is called for data members even in the HP

     case (although not for member functions).

     FIXME: Is that correct?  */

  hpacc_abi_ops.baseclass_offset = gnuv2_baseclass_offset;

}

void

_initialize_hpacc_abi (void)

{

  init_hpacc_ops ();

  regcomp (&constructor_pattern,

           "^This will never match anything, please fill it in$", REG_NOSUB);

  regcomp (&destructor_pattern,

           "^This will never match anything, please fill it in$", REG_NOSUB);

  regcomp (&operator_pattern,

           "^This will never match anything, please fill it in$", REG_NOSUB);

  register_cp_abi (hpacc_abi_ops);

}