#include "objfiles.h"
#include "valprint.h"
#include "c-lang.h"
+#include "exceptions.h"
#include "gdb_assert.h"
#include "gdb_string.h"
return value_from_pointer (lookup_pointer_type (method_type), ptr_value);
}
+/* Objects of this type are stored in a hash table and a vector when
+ printing the vtables for a class. */
+
+struct value_and_voffset
+{
+ /* The value representing the object. */
+ struct value *value;
+
+ /* The maximum vtable offset we've found for any object at this
+ offset in the outermost object. */
+ int max_voffset;
+};
+
+typedef struct value_and_voffset *value_and_voffset_p;
+DEF_VEC_P (value_and_voffset_p);
+
+/* Hash function for value_and_voffset. */
+
+static hashval_t
+hash_value_and_voffset (const void *p)
+{
+ const struct value_and_voffset *o = p;
+
+ return value_address (o->value) + value_embedded_offset (o->value);
+}
+
+/* Equality function for value_and_voffset. */
+
+static int
+eq_value_and_voffset (const void *a, const void *b)
+{
+ const struct value_and_voffset *ova = a;
+ const struct value_and_voffset *ovb = b;
+
+ return (value_address (ova->value) + value_embedded_offset (ova->value)
+ == value_address (ovb->value) + value_embedded_offset (ovb->value));
+}
+
+/* qsort comparison function for value_and_voffset. */
+
+static int
+compare_value_and_voffset (const void *a, const void *b)
+{
+ const struct value_and_voffset * const *ova = a;
+ CORE_ADDR addra = (value_address ((*ova)->value)
+ + value_embedded_offset ((*ova)->value));
+ const struct value_and_voffset * const *ovb = b;
+ CORE_ADDR addrb = (value_address ((*ovb)->value)
+ + value_embedded_offset ((*ovb)->value));
+
+ if (addra < addrb)
+ return -1;
+ if (addra > addrb)
+ return 1;
+ return 0;
+}
+
+/* A helper function used when printing vtables. This determines the
+ key (most derived) sub-object at each address and also computes the
+ maximum vtable offset seen for the corresponding vtable. Updates
+ OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if
+ needed. VALUE is the object to examine. */
+
+static void
+compute_vtable_size (htab_t offset_hash,
+ VEC (value_and_voffset_p) **offset_vec,
+ struct value *value)
+{
+ int i;
+ struct type *type = check_typedef (value_type (value));
+ void **slot;
+ struct value_and_voffset search_vo, *current_vo;
+ CORE_ADDR addr = value_address (value) + value_embedded_offset (value);
+
+ /* If the object is not dynamic, then we are done; as it cannot have
+ dynamic base types either. */
+ if (!gnuv3_dynamic_class (type))
+ return;
+
+ /* Update the hash and the vec, if needed. */
+ search_vo.value = value;
+ slot = htab_find_slot (offset_hash, &search_vo, INSERT);
+ if (*slot)
+ current_vo = *slot;
+ else
+ {
+ current_vo = XNEW (struct value_and_voffset);
+ current_vo->value = value;
+ current_vo->max_voffset = -1;
+ *slot = current_vo;
+ VEC_safe_push (value_and_voffset_p, *offset_vec, current_vo);
+ }
+
+ /* Update the value_and_voffset object with the highest vtable
+ offset from this class. */
+ for (i = 0; i < TYPE_NFN_FIELDS (type); ++i)
+ {
+ int j;
+ struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i);
+
+ for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j)
+ {
+ if (TYPE_FN_FIELD_VIRTUAL_P (fn, j))
+ {
+ int voffset = TYPE_FN_FIELD_VOFFSET (fn, j);
+
+ if (voffset > current_vo->max_voffset)
+ current_vo->max_voffset = voffset;
+ }
+ }
+ }
+
+ /* Recurse into base classes. */
+ for (i = 0; i < TYPE_N_BASECLASSES (type); ++i)
+ compute_vtable_size (offset_hash, offset_vec, value_field (value, i));
+}
+
+/* Helper for gnuv3_print_vtable that prints a single vtable. */
+
+static void
+print_one_vtable (struct gdbarch *gdbarch, struct value *value,
+ int max_voffset,
+ struct value_print_options *opts)
+{
+ int i;
+ struct type *type = check_typedef (value_type (value));
+ struct value *vtable;
+ CORE_ADDR vt_addr;
+
+ vtable = gnuv3_get_vtable (gdbarch, type,
+ value_address (value)
+ + value_embedded_offset (value));
+ vt_addr = value_address (value_field (vtable,
+ vtable_field_virtual_functions));
+
+ printf_filtered (_("vtable for '%s' @ %s (subobject @ %s):\n"),
+ TYPE_SAFE_NAME (type),
+ paddress (gdbarch, vt_addr),
+ paddress (gdbarch, (value_address (value)
+ + value_embedded_offset (value))));
+
+ for (i = 0; i <= max_voffset; ++i)
+ {
+ struct value *vfn;
+ CORE_ADDR addr;
+ volatile struct gdb_exception ex;
+
+ printf_filtered ("[%d]: ", i);
+
+ vfn = value_subscript (value_field (vtable,
+ vtable_field_virtual_functions),
+ i);
+
+ if (gdbarch_vtable_function_descriptors (gdbarch))
+ vfn = value_addr (vfn);
+
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ addr = value_as_address (vfn);
+ }
+ if (ex.reason < 0)
+ printf_filtered (_("<error: %s>"), ex.message);
+ else
+ print_function_pointer_address (gdbarch, addr, gdb_stdout,
+ opts->addressprint);
+ printf_filtered ("\n");
+ }
+}
+
+/* Implementation of the print_vtable method. */
+
+static void
+gnuv3_print_vtable (struct value *value)
+{
+ struct gdbarch *gdbarch;
+ struct type *type;
+ struct value *vtable;
+ struct value_print_options opts;
+ htab_t offset_hash;
+ struct cleanup *cleanup;
+ VEC (value_and_voffset_p) *result_vec;
+ struct value_and_voffset *iter;
+ int i, count;
+
+ value = coerce_ref (value);
+ type = check_typedef (value_type (value));
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ {
+ value = value_ind (value);
+ type = check_typedef (value_type (value));
+ }
+
+ get_user_print_options (&opts);
+
+ /* Respect 'set print object'. */
+ if (opts.objectprint)
+ {
+ value = value_full_object (value, NULL, 0, 0, 0);
+ type = check_typedef (value_type (value));
+ }
+
+ gdbarch = get_type_arch (type);
+ vtable = gnuv3_get_vtable (gdbarch, type,
+ value_as_address (value_addr (value)));
+
+ if (!vtable)
+ {
+ printf_filtered (_("This object does not have a virtual function table\n"));
+ return;
+ }
+
+ offset_hash = htab_create_alloc (1, hash_value_and_voffset,
+ eq_value_and_voffset,
+ xfree, xcalloc, xfree);
+ cleanup = make_cleanup_htab_delete (offset_hash);
+ make_cleanup (VEC_cleanup (value_and_voffset_p), &result_vec);
+
+ compute_vtable_size (offset_hash, &result_vec, value);
+
+ qsort (VEC_address (value_and_voffset_p, result_vec),
+ VEC_length (value_and_voffset_p, result_vec),
+ sizeof (value_and_voffset_p),
+ compare_value_and_voffset);
+
+ count = 0;
+ for (i = 0; VEC_iterate (value_and_voffset_p, result_vec, i, iter); ++i)
+ {
+ if (iter->max_voffset >= 0)
+ {
+ if (count > 0)
+ printf_filtered ("\n");
+ print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts);
+ ++count;
+ }
+ }
+
+ do_cleanups (cleanup);
+}
+
/* Determine if we are currently in a C++ thunk. If so, get the address
of the routine we are thunking to and continue to there instead. */
gnu_v3_abi_ops.method_ptr_size = gnuv3_method_ptr_size;
gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr;
gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value;
+ gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable;
gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline;
gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference;
}
projects / external / binutils.git / commitdiff