1 /* 2 * Clone Visitor 3 * 4 * Copyright (C) 2016 Red Hat, Inc. 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 */ 10 11 #ifndef QAPI_CLONE_VISITOR_H 12 #define QAPI_CLONE_VISITOR_H 13 14 #include "qapi/error.h" 15 #include "qapi/visitor.h" 16 17 /* 18 * The clone visitor is for direct use only by the QAPI_CLONE() macro; 19 * it requires that the root visit occur on an object, list, or 20 * alternate, and is not usable directly on built-in QAPI types. 21 */ 22 typedef struct QapiCloneVisitor QapiCloneVisitor; 23 24 Visitor *qapi_clone_visitor_new(void); 25 Visitor *qapi_clone_members_visitor_new(void); 26 27 /* 28 * Deep-clone QAPI object @src of the given @type, and return the result. 29 * 30 * Not usable on QAPI scalars (integers, strings, enums), nor on a 31 * QAPI object that references the 'any' type. Safe when @src is NULL. 32 */ 33 #define QAPI_CLONE(type, src) \ 34 ({ \ 35 Visitor *v_; \ 36 type *dst_ = (type *) (src); /* Cast away const */ \ 37 \ 38 if (dst_) { \ 39 v_ = qapi_clone_visitor_new(); \ 40 visit_type_ ## type(v_, NULL, &dst_, &error_abort); \ 41 visit_free(v_); \ 42 } \ 43 dst_; \ 44 }) 45 46 /* 47 * Copy deep clones of @type members from @src to @dst. 48 * 49 * Not usable on QAPI scalars (integers, strings, enums), nor on a 50 * QAPI object that references the 'any' type. 51 */ 52 #define QAPI_CLONE_MEMBERS(type, dst, src) \ 53 ({ \ 54 Visitor *v_; \ 55 \ 56 v_ = qapi_clone_members_visitor_new(); \ 57 *(type *)(dst) = *(src); \ 58 visit_type_ ## type ## _members(v_, (type *)(dst), &error_abort); \ 59 visit_free(v_); \ 60 }) 61 62 #endif 63