| 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 |