328 lines
11 KiB
C
328 lines
11 KiB
C
/* Abstraction of HP aCC ABI.
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Contributed by Daniel Berlin <dberlin@redhat.com>
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Most of the real code is from HP, i've just fiddled it to fit in
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the C++ ABI abstraction framework.
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Copyright 2001 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or
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modify
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it under the terms of the GNU General Public License as published
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by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "value.h"
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#include "gdb_regex.h"
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#include "gdb_string.h"
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#include "gdbtypes.h"
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#include "gdbcore.h"
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#include "cp-abi.h"
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struct cp_abi_ops hpacc_abi_ops;
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/* It appears the is_*_name stuff is never used when we try the hpACC
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* ABI. As such, I have no clue what the real answers are. Shouldn't
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* have any more effect than it does now. */
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static regex_t constructor_pattern;
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static regex_t destructor_pattern;
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static regex_t operator_pattern;
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static enum dtor_kinds
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hpacc_is_destructor_name (const char *name)
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{
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if (regexec (&destructor_pattern, name, 0, 0, 0) == 0)
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return complete_object_dtor;
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else
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return 0;
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}
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static enum ctor_kinds
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hpacc_is_constructor_name (const char *name)
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{
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if (regexec (&constructor_pattern, name, 0, 0, 0) == 0)
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return complete_object_ctor;
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else
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return 0;
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}
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static int
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hpacc_is_operator_name (const char *name)
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{
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return regexec (&operator_pattern, name, 0, 0, 0) == 0;
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}
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static int
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hpacc_is_vtable_name (const char *name)
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{
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return strcmp (name,
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"This will never match anything, please fill it in") == 0;
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}
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/* Return a virtual function as a value.
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ARG1 is the object which provides the virtual function
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table pointer. *ARG1P is side-effected in calling this function.
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F is the list of member functions which contains the desired virtual
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function.
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J is an index into F which provides the desired virtual function.
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TYPE is the type in which F is located. */
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static struct value *
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hpacc_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,
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struct type * type, int offset)
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{
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struct value *arg1 = *arg1p;
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struct type *type1 = check_typedef (value_type (arg1));
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/* Deal with HP/Taligent runtime model for virtual functions */
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struct value *vp;
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struct value *argp; /* arg1 cast to base */
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CORE_ADDR coreptr; /* pointer to target address */
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int class_index; /* which class segment pointer to use */
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struct type *ftype = TYPE_FN_FIELD_TYPE (f, j); /* method type */
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argp = value_cast (type, *arg1p);
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if (VALUE_ADDRESS (argp) == 0)
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error ("Address of object is null; object may not have been created.");
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/* pai: FIXME -- 32x64 possible problem? */
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/* First word (4 bytes) in object layout is the vtable pointer */
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coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (argp)); /* pai: (temp) */
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/* + offset + VALUE_EMBEDDED_OFFSET (argp)); */
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if (!coreptr)
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error
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("Virtual table pointer is null for object; object may not have been created.");
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/* pai/1997-05-09
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* FIXME: The code here currently handles only
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* the non-RRBC case of the Taligent/HP runtime spec; when RRBC
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* is introduced, the condition for the "if" below will have to
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* be changed to be a test for the RRBC case. */
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if (1)
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{
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/* Non-RRBC case; the virtual function pointers are stored at fixed
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* offsets in the virtual table. */
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/* Retrieve the offset in the virtual table from the debug
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* info. The offset of the vfunc's entry is in words from
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* the beginning of the vtable; but first we have to adjust
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* by HP_ACC_VFUNC_START to account for other entries */
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/* pai: FIXME: 32x64 problem here, a word may be 8 bytes in
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* which case the multiplier should be 8 and values should be long */
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vp = value_at (builtin_type_int,
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coreptr + 4 * (TYPE_FN_FIELD_VOFFSET (f, j) +
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HP_ACC_VFUNC_START));
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coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
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/* coreptr now contains the address of the virtual function */
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/* (Actually, it contains the pointer to the plabel for the function. */
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}
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else
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{
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/* RRBC case; the virtual function pointers are found by double
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* indirection through the class segment tables. */
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/* Choose class segment depending on type we were passed */
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class_index = class_index_in_primary_list (type);
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/* Find class segment pointer. These are in the vtable slots after
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* some other entries, so adjust by HP_ACC_VFUNC_START for that. */
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/* pai: FIXME 32x64 problem here, if words are 8 bytes long
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* the multiplier below has to be 8 and value should be long. */
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vp = value_at (builtin_type_int,
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coreptr + 4 * (HP_ACC_VFUNC_START + class_index));
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/* Indirect once more, offset by function index */
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/* pai: FIXME 32x64 problem here, again multiplier could be 8 and value long */
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coreptr =
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*(CORE_ADDR *) (VALUE_CONTENTS (vp) +
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4 * TYPE_FN_FIELD_VOFFSET (f, j));
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vp = value_at (builtin_type_int, coreptr);
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coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
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/* coreptr now contains the address of the virtual function */
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/* (Actually, it contains the pointer to the plabel for the function.) */
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}
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if (!coreptr)
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error ("Address of virtual function is null; error in virtual table?");
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/* Wrap this addr in a value and return pointer */
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vp = allocate_value (ftype);
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vp->type = ftype;
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VALUE_ADDRESS (vp) = coreptr;
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/* pai: (temp) do we need the value_ind stuff in value_fn_field? */
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return vp;
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}
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static struct type *
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hpacc_value_rtti_type (struct value *v, int *full, int *top, int *using_enc)
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{
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struct type *known_type;
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struct type *rtti_type;
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CORE_ADDR coreptr;
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struct value *vp;
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int using_enclosing = 0;
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long top_offset = 0;
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char rtti_type_name[256];
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if (full)
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*full = 0;
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if (top)
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*top = -1;
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if (using_enc)
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*using_enc = 0;
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/* Get declared type */
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known_type = value_type (v);
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CHECK_TYPEDEF (known_type);
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/* RTTI works only or class objects */
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if (TYPE_CODE (known_type) != TYPE_CODE_CLASS)
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return NULL;
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/* If neither the declared type nor the enclosing type of the
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* value structure has a HP ANSI C++ style virtual table,
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* we can't do anything. */
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if (!TYPE_HAS_VTABLE (known_type))
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{
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known_type = VALUE_ENCLOSING_TYPE (v);
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CHECK_TYPEDEF (known_type);
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if ((TYPE_CODE (known_type) != TYPE_CODE_CLASS) ||
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!TYPE_HAS_VTABLE (known_type))
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return NULL; /* No RTTI, or not HP-compiled types */
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CHECK_TYPEDEF (known_type);
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using_enclosing = 1;
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}
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if (using_enclosing && using_enc)
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*using_enc = 1;
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/* First get the virtual table address */
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coreptr = *(CORE_ADDR *) ((VALUE_CONTENTS_ALL (v))
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+ value_offset (v)
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+ (using_enclosing
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? 0
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: VALUE_EMBEDDED_OFFSET (v)));
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if (coreptr == 0)
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/* return silently -- maybe called on gdb-generated value */
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return NULL;
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/* Fetch the top offset of the object */
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/* FIXME possible 32x64 problem with pointer size & arithmetic */
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vp = value_at (builtin_type_int,
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coreptr + 4 * HP_ACC_TOP_OFFSET_OFFSET);
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top_offset = value_as_long (vp);
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if (top)
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*top = top_offset;
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/* Fetch the typeinfo pointer */
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/* FIXME possible 32x64 problem with pointer size & arithmetic */
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vp = value_at (builtin_type_int, coreptr + 4 * HP_ACC_TYPEINFO_OFFSET);
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/* Indirect through the typeinfo pointer and retrieve the pointer
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* to the string name */
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coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
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if (!coreptr)
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error ("Retrieved null typeinfo pointer in trying to determine "
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"run-time type");
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/* 4 -> offset of name field */
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vp = value_at (builtin_type_int, coreptr + 4);
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/* FIXME possible 32x64 problem */
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coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
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read_memory_string (coreptr, rtti_type_name, 256);
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if (strlen (rtti_type_name) == 0)
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error ("Retrieved null type name from typeinfo");
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/* search for type */
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rtti_type = lookup_typename (rtti_type_name, (struct block *) 0, 1);
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if (!rtti_type)
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error ("Could not find run-time type: invalid type name %s in typeinfo??",
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rtti_type_name);
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CHECK_TYPEDEF (rtti_type);
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#if 0
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printf ("RTTI type name %s, tag %s, full? %d\n", TYPE_NAME (rtti_type),
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TYPE_TAG_NAME (rtti_type), full ? *full : -1);
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#endif
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/* Check whether we have the entire object */
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if (full /* Non-null pointer passed */
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&&
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/* Either we checked on the whole object in hand and found the
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top offset to be zero */
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(((top_offset == 0) &&
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using_enclosing &&
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TYPE_LENGTH (known_type) == TYPE_LENGTH (rtti_type))
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||
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/* Or we checked on the embedded object and top offset was the
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same as the embedded offset */
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((top_offset == VALUE_EMBEDDED_OFFSET (v)) &&
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!using_enclosing &&
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TYPE_LENGTH (VALUE_ENCLOSING_TYPE (v)) == TYPE_LENGTH (rtti_type))))
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*full = 1;
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return rtti_type;
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}
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extern int gnuv2_baseclass_offset (struct type *type, int index,
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char *valaddr, CORE_ADDR address);
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static void
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init_hpacc_ops (void)
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{
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hpacc_abi_ops.shortname = "hpaCC";
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hpacc_abi_ops.longname = "HP aCC ABI";
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hpacc_abi_ops.doc = "HP aCC ABI";
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hpacc_abi_ops.is_destructor_name = hpacc_is_destructor_name;
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hpacc_abi_ops.is_constructor_name = hpacc_is_constructor_name;
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hpacc_abi_ops.is_vtable_name = hpacc_is_vtable_name;
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hpacc_abi_ops.is_operator_name = hpacc_is_operator_name;
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hpacc_abi_ops.virtual_fn_field = hpacc_virtual_fn_field;
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hpacc_abi_ops.rtti_type = hpacc_value_rtti_type;
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/* It seems that this function is specific to GNU G++ < 3.0.
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However, it is called for data members even in the HP
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case (although not for member functions).
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FIXME: Is that correct? */
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hpacc_abi_ops.baseclass_offset = gnuv2_baseclass_offset;
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}
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extern initialize_file_ftype _initialize_hpacc_abi; /* -Wmissing-prototypes */
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void
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_initialize_hpacc_abi (void)
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{
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init_hpacc_ops ();
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regcomp (&constructor_pattern,
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"^This will never match anything, please fill it in$", REG_NOSUB);
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regcomp (&destructor_pattern,
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"^This will never match anything, please fill it in$", REG_NOSUB);
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regcomp (&operator_pattern,
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"^This will never match anything, please fill it in$", REG_NOSUB);
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register_cp_abi (&hpacc_abi_ops);
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}
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