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| Current File : //usr/src/contrib/gdb/gdb/hpacc-abi.c |
/* 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;
}
extern initialize_file_ftype _initialize_hpacc_abi; /* -Wmissing-prototypes */
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);
}