+ /*
+ * Instructions for recursive traversal through composed types.
+ */
+ case FILTER_OP_GET_CONTEXT_ROOT:
+ case FILTER_OP_GET_APP_CONTEXT_ROOT:
+ case FILTER_OP_GET_PAYLOAD_ROOT:
+ {
+ if (vstack_push(stack)) {
+ ret = -EINVAL;
+ goto end;
+ }
+ vstack_ax(stack)->type = REG_PTR;
+ next_pc += sizeof(struct load_op);
+ break;
+ }
+
+ case FILTER_OP_LOAD_FIELD:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ vstack_ax(stack)->type = REG_UNKNOWN;
+ next_pc += sizeof(struct load_op);
+ break;
+ }
+
+ case FILTER_OP_LOAD_FIELD_S8:
+ case FILTER_OP_LOAD_FIELD_S16:
+ case FILTER_OP_LOAD_FIELD_S32:
+ case FILTER_OP_LOAD_FIELD_S64:
+ case FILTER_OP_LOAD_FIELD_U8:
+ case FILTER_OP_LOAD_FIELD_U16:
+ case FILTER_OP_LOAD_FIELD_U32:
+ case FILTER_OP_LOAD_FIELD_U64:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ vstack_ax(stack)->type = REG_S64;
+ next_pc += sizeof(struct load_op);
+ break;
+ }
+
+ case FILTER_OP_LOAD_FIELD_STRING:
+ case FILTER_OP_LOAD_FIELD_SEQUENCE:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ vstack_ax(stack)->type = REG_STRING;
+ next_pc += sizeof(struct load_op);
+ break;
+ }
+
+ case FILTER_OP_LOAD_FIELD_DOUBLE:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ vstack_ax(stack)->type = REG_DOUBLE;
+ next_pc += sizeof(struct load_op);
+ break;
+ }
+
+ case FILTER_OP_GET_SYMBOL:
+ case FILTER_OP_GET_SYMBOL_FIELD:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ next_pc += sizeof(struct load_op) + sizeof(struct get_symbol);
+ break;
+ }
+
+ case FILTER_OP_GET_INDEX_U16:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16);
+ break;
+ }
+
+ case FILTER_OP_GET_INDEX_U64:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ if (vstack_ax(stack)->type != REG_PTR) {
+ ERR("Expecting pointer on top of stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64);
+ break;
+ }
+