/* Abstraction of GNU v2 abi.
+
+ Copyright (C) 2001-2020 Free Software Foundation, Inc.
+
Contributed by Daniel Berlin <dberlin@redhat.com>
- 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
+ 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,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_string.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "value.h"
#include "demangle.h"
+#include "gdb-demangle.h"
#include "cp-abi.h"
-
+#include "cp-support.h"
#include <ctype.h>
struct cp_abi_ops gnu_v2_abi_ops;
gnuv2_is_destructor_name (const char *name)
{
if ((name[0] == '_' && is_cplus_marker (name[1]) && name[2] == '_')
- || strncmp (name, "__dt__", 6) == 0)
+ || startswith (name, "__dt__"))
return complete_object_dtor;
else
- return 0;
+ return (enum dtor_kinds) 0;
}
static enum ctor_kinds
{
if ((name[0] == '_' && name[1] == '_'
&& (isdigit (name[2]) || strchr ("Qt", name[2])))
- || strncmp (name, "__ct__", 6) == 0)
+ || startswith (name, "__ct__"))
return complete_object_ctor;
else
- return 0;
+ return (enum ctor_kinds) 0;
}
static int
static int
gnuv2_is_operator_name (const char *name)
{
- return strncmp (name, "operator", 8) == 0;
+ return startswith (name, CP_OPERATOR_STR);
}
\f
J is an index into F which provides the desired virtual function.
TYPE is the type in which F is located. */
-static value_ptr
-gnuv2_virtual_fn_field (value_ptr * arg1p, struct fn_field * f, int j,
+static struct value *
+gnuv2_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,
struct type * type, int offset)
{
- value_ptr arg1 = *arg1p;
- struct type *type1 = check_typedef (VALUE_TYPE (arg1));
-
-
+ struct value *arg1 = *arg1p;
+ struct type *type1 = check_typedef (value_type (arg1));
struct type *entry_type;
/* First, get the virtual function table pointer. That comes
with a strange type, so cast it to type `pointer to long' (which
should serve just fine as a function type). Then, index into
the table, and convert final value to appropriate function type. */
- value_ptr entry, vfn, vtbl;
- value_ptr vi = value_from_longest (builtin_type_int,
- (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j));
+ struct value *entry;
+ struct value *vfn;
+ struct value *vtbl;
+ LONGEST vi = (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j);
struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j);
struct type *context;
+ struct type *context_vptr_basetype;
+ int context_vptr_fieldno;
+
if (fcontext == NULL)
/* We don't have an fcontext (e.g. the program was compiled with
g++ version 1). Try to get the vtbl from the TYPE_VPTR_BASETYPE.
/* Now context is a pointer to the basetype containing the vtbl. */
if (TYPE_TARGET_TYPE (context) != type1)
{
- value_ptr tmp = value_cast (context, value_addr (arg1));
- VALUE_POINTED_TO_OFFSET (tmp) = 0;
+ struct value *tmp = value_cast (context, value_addr (arg1));
+
arg1 = value_ind (tmp);
- type1 = check_typedef (VALUE_TYPE (arg1));
+ type1 = check_typedef (value_type (arg1));
}
context = type1;
/* This type may have been defined before its virtual function table
was. If so, fill in the virtual function table entry for the
type now. */
- if (TYPE_VPTR_FIELDNO (context) < 0)
- fill_in_vptr_fieldno (context);
+ context_vptr_fieldno = get_vptr_fieldno (context, &context_vptr_basetype);
+ /* FIXME: What to do if vptr_fieldno is still -1? */
/* The virtual function table is now an array of structures
which have the form { int16 offset, delta; void *pfn; }. */
- vtbl = value_primitive_field (arg1, 0, TYPE_VPTR_FIELDNO (context),
- TYPE_VPTR_BASETYPE (context));
+ vtbl = value_primitive_field (arg1, 0, context_vptr_fieldno,
+ context_vptr_basetype);
/* With older versions of g++, the vtbl field pointed to an array
- of structures. Nowadays it points directly to the structure. */
- if (TYPE_CODE (VALUE_TYPE (vtbl)) == TYPE_CODE_PTR
- && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (vtbl))) == TYPE_CODE_ARRAY)
+ of structures. Nowadays it points directly to the structure. */
+ if (value_type (vtbl)->code () == TYPE_CODE_PTR
+ && TYPE_TARGET_TYPE (value_type (vtbl))->code () == TYPE_CODE_ARRAY)
{
/* Handle the case where the vtbl field points to an
- array of structures. */
+ array of structures. */
vtbl = value_ind (vtbl);
/* Index into the virtual function table. This is hard-coded because
}
else
{
- /* Handle the case where the vtbl field points directly to a structure. */
- vtbl = value_add (vtbl, vi);
+ /* Handle the case where the vtbl field points directly to a
+ structure. */
+ vtbl = value_ptradd (vtbl, vi);
entry = value_ind (vtbl);
}
- entry_type = check_typedef (VALUE_TYPE (entry));
+ entry_type = check_typedef (value_type (entry));
- if (TYPE_CODE (entry_type) == TYPE_CODE_STRUCT)
+ if (entry_type->code () == TYPE_CODE_STRUCT)
{
- /* Move the `this' pointer according to the virtual function table. */
- VALUE_OFFSET (arg1) += value_as_long (value_field (entry, 0));
+ /* Move the `this' pointer according to the virtual function table. */
+ set_value_offset (arg1, value_offset (arg1)
+ + value_as_long (value_field (entry, 0)));
- if (!VALUE_LAZY (arg1))
+ if (!value_lazy (arg1))
{
- VALUE_LAZY (arg1) = 1;
+ set_value_lazy (arg1, 1);
value_fetch_lazy (arg1);
}
vfn = value_field (entry, 2);
}
- else if (TYPE_CODE (entry_type) == TYPE_CODE_PTR)
+ else if (entry_type->code () == TYPE_CODE_PTR)
vfn = entry;
else
- error ("I'm confused: virtual function table has bad type");
+ error (_("I'm confused: virtual function table has bad type"));
/* Reinstantiate the function pointer with the correct type. */
- VALUE_TYPE (vfn) = lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j));
+ deprecated_set_value_type (vfn,
+ lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j)));
*arg1p = arg1;
return vfn;
}
-struct type *
-gnuv2_value_rtti_type (value_ptr v, int *full, int *top, int *using_enc)
+static struct type *
+gnuv2_value_rtti_type (struct value *v, int *full, LONGEST *top, int *using_enc)
{
struct type *known_type;
struct type *rtti_type;
- CORE_ADDR coreptr;
- value_ptr vp;
- int using_enclosing = 0;
- long top_offset = 0;
- char rtti_type_name[256];
CORE_ADDR vtbl;
- struct minimal_symbol *minsym;
- struct symbol *sym;
- char *demangled_name;
+ struct bound_minimal_symbol minsym;
+ char *demangled_name, *p;
+ const char *linkage_name;
struct type *btype;
+ struct type *known_type_vptr_basetype;
+ int known_type_vptr_fieldno;
if (full)
*full = 0;
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)
+ /* Get declared type. */
+ known_type = value_type (v);
+ known_type = check_typedef (known_type);
+ /* RTTI works only or class objects. */
+ if (known_type->code () != TYPE_CODE_STRUCT)
return NULL;
/* Plan on this changing in the future as i get around to setting
the type info functions, which are always right. Deal with it
until then. */
- /* If the type has no vptr fieldno, try to get it filled in */
- if (TYPE_VPTR_FIELDNO(known_type) < 0)
- fill_in_vptr_fieldno(known_type);
+ /* Try to get the vptr basetype, fieldno. */
+ known_type_vptr_fieldno = get_vptr_fieldno (known_type,
+ &known_type_vptr_basetype);
- /* If we still can't find one, give up */
- if (TYPE_VPTR_FIELDNO(known_type) < 0)
+ /* If we can't find it, give up. */
+ if (known_type_vptr_fieldno < 0)
return NULL;
/* Make sure our basetype and known type match, otherwise, cast
- so we can get at the vtable properly.
- */
- btype = TYPE_VPTR_BASETYPE (known_type);
- CHECK_TYPEDEF (btype);
+ so we can get at the vtable properly. */
+ btype = known_type_vptr_basetype;
+ btype = check_typedef (btype);
if (btype != known_type )
{
v = value_cast (btype, v);
if (using_enc)
*using_enc=1;
}
- /*
- We can't use value_ind here, because it would want to use RTTI, and
- we'd waste a bunch of time figuring out we already know the type.
- Besides, we don't care about the type, just the actual pointer
- */
- if (VALUE_ADDRESS (value_field (v, TYPE_VPTR_FIELDNO (known_type))) == 0)
+ /* We can't use value_ind here, because it would want to use RTTI, and
+ we'd waste a bunch of time figuring out we already know the type.
+ Besides, we don't care about the type, just the actual pointer. */
+ if (value_address (value_field (v, known_type_vptr_fieldno)) == 0)
return NULL;
- /*
- If we are enclosed by something that isn't us, adjust the
- address properly and set using_enclosing.
- */
- if (VALUE_ENCLOSING_TYPE(v) != VALUE_TYPE(v))
- {
- value_ptr tempval;
- int bitpos = TYPE_BASECLASS_BITPOS (known_type,
- TYPE_VPTR_FIELDNO (known_type));
- tempval=value_field (v, TYPE_VPTR_FIELDNO(known_type));
- VALUE_ADDRESS(tempval) += bitpos / 8;
- vtbl=value_as_pointer (tempval);
- using_enclosing=1;
- }
- else
- {
- vtbl=value_as_pointer(value_field(v,TYPE_VPTR_FIELDNO(known_type)));
- using_enclosing=0;
- }
+ vtbl = value_as_address (value_field (v, known_type_vptr_fieldno));
- /* Try to find a symbol that is the vtable */
+ /* Try to find a symbol that is the vtable. */
minsym=lookup_minimal_symbol_by_pc(vtbl);
- if (minsym==NULL
- || (demangled_name=SYMBOL_NAME(minsym))==NULL
- || !is_vtable_name (demangled_name))
+ if (minsym.minsym==NULL
+ || (linkage_name=minsym.minsym->linkage_name ())==NULL
+ || !is_vtable_name (linkage_name))
return NULL;
- /* If we just skip the prefix, we get screwed by namespaces */
- demangled_name=cplus_demangle(demangled_name,DMGL_PARAMS|DMGL_ANSI);
- *(strchr(demangled_name,' '))=0;
+ /* If we just skip the prefix, we get screwed by namespaces. */
+ demangled_name=gdb_demangle(linkage_name,DMGL_PARAMS|DMGL_ANSI);
+ p = strchr (demangled_name, ' ');
+ if (p)
+ *p = '\0';
- /* Lookup the type for the name */
- rtti_type=lookup_typename(demangled_name, (struct block *)0,1);
-
- if (rtti_type==NULL)
+ /* Lookup the type for the name. */
+ /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */
+ rtti_type = cp_lookup_rtti_type (demangled_name, NULL);
+ if (rtti_type == NULL)
return NULL;
if (TYPE_N_BASECLASSES(rtti_type) > 1 && full && (*full) != 1)
{
if (top)
- *top=TYPE_BASECLASS_BITPOS(rtti_type,TYPE_VPTR_FIELDNO(rtti_type))/8;
+ *top = TYPE_BASECLASS_BITPOS (rtti_type,
+ TYPE_VPTR_FIELDNO(rtti_type)) / 8;
if (top && ((*top) >0))
{
if (TYPE_LENGTH(rtti_type) > TYPE_LENGTH(known_type))
if (full)
*full=1;
}
- if (using_enc)
- *using_enc=using_enclosing;
return rtti_type;
}
+/* Return true if the INDEXth field of TYPE is a virtual baseclass
+ pointer which is for the base class whose type is BASECLASS. */
+
+static int
+vb_match (struct type *type, int index, struct type *basetype)
+{
+ struct type *fieldtype;
+ const char *name = TYPE_FIELD_NAME (type, index);
+ const char *field_class_name = NULL;
+
+ if (*name != '_')
+ return 0;
+ /* gcc 2.4 uses _vb$. */
+ if (name[1] == 'v' && name[2] == 'b' && is_cplus_marker (name[3]))
+ field_class_name = name + 4;
+ /* gcc 2.5 will use __vb_. */
+ if (name[1] == '_' && name[2] == 'v' && name[3] == 'b' && name[4] == '_')
+ field_class_name = name + 5;
+
+ if (field_class_name == NULL)
+ /* This field is not a virtual base class pointer. */
+ return 0;
+
+ /* It's a virtual baseclass pointer, now we just need to find out whether
+ it is for this baseclass. */
+ fieldtype = TYPE_FIELD_TYPE (type, index);
+ if (fieldtype == NULL
+ || fieldtype->code () != TYPE_CODE_PTR)
+ /* "Can't happen". */
+ return 0;
+
+ /* What we check for is that either the types are equal (needed for
+ nameless types) or have the same name. This is ugly, and a more
+ elegant solution should be devised (which would probably just push
+ the ugliness into symbol reading unless we change the stabs format). */
+ if (TYPE_TARGET_TYPE (fieldtype) == basetype)
+ return 1;
+
+ if (basetype->name () != NULL
+ && TYPE_TARGET_TYPE (fieldtype)->name () != NULL
+ && strcmp (basetype->name (),
+ TYPE_TARGET_TYPE (fieldtype)->name ()) == 0)
+ return 1;
+ return 0;
+}
+
+/* Compute the offset of the baseclass which is the INDEXth baseclass
+ of class TYPE, for value at VALADDR (in host) at ADDRESS (in
+ target). The result is the offset of the baseclass value relative
+ to (the address of)(ARG) + OFFSET. */
+
+static int
+gnuv2_baseclass_offset (struct type *type, int index,
+ const bfd_byte *valaddr, LONGEST embedded_offset,
+ CORE_ADDR address, const struct value *val)
+{
+ struct type *basetype = TYPE_BASECLASS (type, index);
+
+ if (BASETYPE_VIA_VIRTUAL (type, index))
+ {
+ /* Must hunt for the pointer to this virtual baseclass. */
+ int i, len = type->num_fields ();
+ int n_baseclasses = TYPE_N_BASECLASSES (type);
+
+ /* First look for the virtual baseclass pointer
+ in the fields. */
+ for (i = n_baseclasses; i < len; i++)
+ {
+ if (vb_match (type, i, basetype))
+ {
+ struct type *field_type;
+ LONGEST field_offset;
+ int field_length;
+ CORE_ADDR addr;
+
+ field_type = check_typedef (TYPE_FIELD_TYPE (type, i));
+ field_offset = TYPE_FIELD_BITPOS (type, i) / 8;
+ field_length = TYPE_LENGTH (field_type);
+
+ if (!value_bytes_available (val, embedded_offset + field_offset,
+ field_length))
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("Virtual baseclass pointer is not available"));
+
+ addr = unpack_pointer (field_type,
+ valaddr + embedded_offset + field_offset);
+
+ return addr - (LONGEST) address + embedded_offset;
+ }
+ }
+ /* Not in the fields, so try looking through the baseclasses. */
+ for (i = index + 1; i < n_baseclasses; i++)
+ {
+ /* Don't go through baseclass_offset, as that wraps
+ exceptions, thus, inner exceptions would be wrapped more
+ than once. */
+ int boffset =
+ gnuv2_baseclass_offset (type, i, valaddr,
+ embedded_offset, address, val);
+
+ if (boffset)
+ return boffset;
+ }
+
+ error (_("Baseclass offset not found"));
+ }
+
+ /* Baseclass is easily computed. */
+ return TYPE_BASECLASS_BITPOS (type, index) / 8;
+}
static void
init_gnuv2_ops (void)
gnu_v2_abi_ops.is_operator_name = gnuv2_is_operator_name;
gnu_v2_abi_ops.virtual_fn_field = gnuv2_virtual_fn_field;
gnu_v2_abi_ops.rtti_type = gnuv2_value_rtti_type;
+ gnu_v2_abi_ops.baseclass_offset = gnuv2_baseclass_offset;
}
+void _initialize_gnu_v2_abi ();
void
-_initialize_gnu_v2_abi (void)
+_initialize_gnu_v2_abi ()
{
init_gnuv2_ops ();
- register_cp_abi (gnu_v2_abi_ops);
- switch_to_cp_abi ("gnu-v2");
+ register_cp_abi (&gnu_v2_abi_ops);
}
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