/* Abstraction of GNU v2 abi.
+
+ Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+
Contributed by Daniel Berlin <dberlin@redhat.com>
- Copyright 2001 Free Software Foundation, Inc.
This file is part of GDB.
#include "value.h"
#include "demangle.h"
#include "cp-abi.h"
+#include "cp-support.h"
#include <ctype.h>
struct cp_abi_ops gnu_v2_abi_ops;
static int vb_match (struct type *, int, struct type *);
+int gnuv2_baseclass_offset (struct type *type, int index, char *valaddr,
+ CORE_ADDR address);
static enum dtor_kinds
gnuv2_is_destructor_name (const char *name)
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 value *arg1 = *arg1p;
struct type *type1 = check_typedef (VALUE_TYPE (arg1));
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,
+ struct value *entry;
+ struct value *vfn;
+ struct value *vtbl;
+ struct value *vi = value_from_longest (builtin_type_int,
(LONGEST) TYPE_FN_FIELD_VOFFSET (f, j));
struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j);
struct type *context;
/* 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));
}
}
-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, int *top, int *using_enc)
{
struct type *known_type;
struct type *rtti_type;
CORE_ADDR coreptr;
- value_ptr vp;
- int using_enclosing = 0;
+ struct value *vp;
long top_offset = 0;
char rtti_type_name[256];
CORE_ADDR vtbl;
if (VALUE_ADDRESS (value_field (v, TYPE_VPTR_FIELDNO (known_type))) == 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,TYPE_VPTR_FIELDNO(known_type)));
/* 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
+ || (demangled_name=DEPRECATED_SYMBOL_NAME (minsym))==NULL
|| !is_vtable_name (demangled_name))
return NULL;
*(strchr(demangled_name,' '))=0;
/* Lookup the type for the name */
- rtti_type=lookup_typename(demangled_name, (struct block *)0,1);
-
- if (rtti_type==NULL)
+ /* 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 (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;
+ char *name = TYPE_FIELD_NAME (type, index);
+ 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
+ || TYPE_CODE (fieldtype) != 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 (TYPE_NAME (basetype) != NULL
+ && TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)) != NULL
+ && strcmp (TYPE_NAME (basetype),
+ TYPE_NAME (TYPE_TARGET_TYPE (fieldtype))) == 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.
+
+ -1 is returned on error. */
+
+int
+gnuv2_baseclass_offset (struct type *type, int index, char *valaddr,
+ CORE_ADDR address)
+{
+ 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_NFIELDS (type);
+ 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))
+ {
+ CORE_ADDR addr
+ = unpack_pointer (TYPE_FIELD_TYPE (type, i),
+ valaddr + (TYPE_FIELD_BITPOS (type, i) / 8));
+
+ return addr - (LONGEST) address;
+ }
+ }
+ /* Not in the fields, so try looking through the baseclasses. */
+ for (i = index + 1; i < n_baseclasses; i++)
+ {
+ int boffset =
+ baseclass_offset (type, i, valaddr, address);
+ if (boffset)
+ return boffset;
+ }
+ /* Not found. */
+ return -1;
+ }
+
+ /* 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;
}
+extern initialize_file_ftype _initialize_gnu_v2_abi; /* -Wmissing-prototypes */
+
void
_initialize_gnu_v2_abi (void)
{
init_gnuv2_ops ();
- register_cp_abi (gnu_v2_abi_ops);
- switch_to_cp_abi ("gnu-v2");
+ register_cp_abi (&gnu_v2_abi_ops);
+ set_cp_abi_as_auto_default (gnu_v2_abi_ops.shortname);
}
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