static tree
cp_ubsan_dfs_initialize_vtbl_ptrs (tree binfo, void *data)
{
if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
return dfs_skip_bases;
if (!BINFO_PRIMARY_P (binfo))
{
tree base_ptr = TREE_VALUE ((tree) data);
base_ptr = build_base_path (PLUS_EXPR, base_ptr, binfo, /*nonnull=*/1,
tf_warning_or_error);
/* Compute the location of the vtpr. */
tree vtbl_ptr
= build_vfield_ref (cp_build_fold_indirect_ref (base_ptr),
TREE_TYPE (binfo));
gcc_assert (vtbl_ptr != error_mark_node);
/* Assign NULL to the vptr. */
tree vtbl = build_zero_cst (TREE_TYPE (vtbl_ptr));
tree stmt = cp_build_modify_expr (input_location, vtbl_ptr, NOP_EXPR,
vtbl, tf_warning_or_error);
if (vptr_via_virtual_p (binfo))
/* If this vptr comes from a virtual base of the complete object, only
clear it if we're in charge of virtual bases. */
stmt = build_if_in_charge (stmt);
finish_expr_stmt (stmt);
}
return NULL_TREE;
}
static tree
cp_ubsan_dfs_initialize_vtbl_ptrs (tree binfo, void *data)
{
if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
return dfs_skip_bases;
if (!BINFO_PRIMARY_P (binfo) || BINFO_VIRTUAL_P (binfo))
{
tree base_ptr = TREE_VALUE ((tree) data);
base_ptr = build_base_path (PLUS_EXPR, base_ptr, binfo, /*nonnull=*/1,
tf_warning_or_error);
/* Compute the location of the vtpr. */
tree vtbl_ptr
= build_vfield_ref (cp_build_indirect_ref (base_ptr, RO_NULL,
tf_warning_or_error),
TREE_TYPE (binfo));
gcc_assert (vtbl_ptr != error_mark_node);
/* Assign NULL to the vptr. */
tree vtbl = build_zero_cst (TREE_TYPE (vtbl_ptr));
finish_expr_stmt (cp_build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl,
tf_warning_or_error));
}
return NULL_TREE;
}
