/* 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); }