also save/restore pool pos in repodata load callback
[platform/upstream/libsolv.git] / src / rules.h
1 /*
2  * Copyright (c) 2007-2009, Novell Inc.
3  *
4  * This program is licensed under the BSD license, read LICENSE.BSD
5  * for further information
6  */
7
8 /*
9  * rules.h
10  *
11  */
12
13 #ifndef LIBSOLV_RULES_H
14 #define LIBSOLV_RULES_H
15
16 #ifdef __cplusplus
17 extern "C" {
18 #endif
19
20 /* ----------------------------------------------
21  * Rule
22  *
23  *   providerN(B) == Package Id of package providing tag B
24  *   N = 1, 2, 3, in case of multiple providers
25  *
26  * A requires B : !A | provider1(B) | provider2(B)
27  *
28  * A conflicts B : (!A | !provider1(B)) & (!A | !provider2(B)) ...
29  *
30  * 'not' is encoded as a negative Id
31  *
32  * Binary rule: p = first literal, d = 0, w2 = second literal, w1 = p
33  *
34  * There are a lot of rules, so the struct is kept as small as
35  * possible. Do not add new members unless there is no other way.
36  */
37
38 typedef struct _Rule {
39   Id p;         /* first literal in rule */
40   Id d;         /* Id offset into 'list of providers terminated by 0' as used by whatprovides; pool->whatprovides + d */
41                 /* in case of binary rules, d == 0, w1 == p, w2 == other literal */
42                 /* in case of disabled rules: ~d, aka -d - 1 */
43   Id w1, w2;    /* watches, literals not-yet-decided */
44                 /* if !w2, assertion, not rule */
45   Id n1, n2;    /* next rules in linked list, corresponding to w1, w2 */
46 } Rule;
47
48
49 typedef enum {
50   SOLVER_RULE_UNKNOWN = 0,
51   SOLVER_RULE_RPM = 0x100,
52   SOLVER_RULE_RPM_NOT_INSTALLABLE,
53   SOLVER_RULE_RPM_NOTHING_PROVIDES_DEP,
54   SOLVER_RULE_RPM_PACKAGE_REQUIRES,
55   SOLVER_RULE_RPM_SELF_CONFLICT,
56   SOLVER_RULE_RPM_PACKAGE_CONFLICT,
57   SOLVER_RULE_RPM_SAME_NAME,
58   SOLVER_RULE_RPM_PACKAGE_OBSOLETES,
59   SOLVER_RULE_RPM_IMPLICIT_OBSOLETES,
60   SOLVER_RULE_RPM_INSTALLEDPKG_OBSOLETES,
61   SOLVER_RULE_UPDATE = 0x200,
62   SOLVER_RULE_FEATURE = 0x300,
63   SOLVER_RULE_JOB = 0x400,
64   SOLVER_RULE_JOB_NOTHING_PROVIDES_DEP,
65   SOLVER_RULE_JOB_PROVIDED_BY_SYSTEM,
66   SOLVER_RULE_JOB_UNKNOWN_PACKAGE,
67   SOLVER_RULE_JOB_UNSUPPORTED,
68   SOLVER_RULE_DISTUPGRADE = 0x500,
69   SOLVER_RULE_INFARCH = 0x600,
70   SOLVER_RULE_CHOICE = 0x700,
71   SOLVER_RULE_LEARNT = 0x800,
72   SOLVER_RULE_BEST = 0x900
73 } SolverRuleinfo;
74
75 #define SOLVER_RULE_TYPEMASK    0xff00
76
77 struct _Solver;
78
79 /*-------------------------------------------------------------------
80  * disable rule
81  */
82
83 static inline void
84 solver_disablerule(struct _Solver *solv, Rule *r)
85 {
86   if (r->d >= 0)
87     r->d = -r->d - 1;
88 }
89
90 /*-------------------------------------------------------------------
91  * enable rule
92  */
93
94 static inline void
95 solver_enablerule(struct _Solver *solv, Rule *r)
96 {
97   if (r->d < 0)
98     r->d = -r->d - 1;
99 }
100
101 extern Rule *solver_addrule(struct _Solver *solv, Id p, Id d);
102 extern void solver_unifyrules(struct _Solver *solv);
103 extern int solver_rulecmp(struct _Solver *solv, Rule *r1, Rule *r2);
104 extern void solver_shrinkrules(struct _Solver *solv, int nrules);
105
106 /* rpm rules */
107 extern void solver_addrpmrulesforsolvable(struct _Solver *solv, Solvable *s, Map *m);
108 extern void solver_addrpmrulesforweak(struct _Solver *solv, Map *m);
109 extern void solver_addrpmrulesforupdaters(struct _Solver *solv, Solvable *s, Map *m, int allow_all);
110
111 /* update/feature rules */
112 extern void solver_addupdaterule(struct _Solver *solv, Solvable *s, int allow_all);
113
114 /* infarch rules */
115 extern void solver_addinfarchrules(struct _Solver *solv, Map *addedmap);
116
117 /* dup rules */
118 extern void solver_createdupmaps(struct _Solver *solv);
119 extern void solver_freedupmaps(struct _Solver *solv);
120 extern void solver_addduprules(struct _Solver *solv, Map *addedmap);
121
122 /* choice rules */
123 extern void solver_addchoicerules(struct _Solver *solv);
124 extern void solver_disablechoicerules(struct _Solver *solv, Rule *r);
125
126 /* best rules */
127 extern void solver_addbestrules(struct _Solver *solv, int havebestinstalljobs);
128
129 /* policy rule disabling/reenabling */
130 extern void solver_disablepolicyrules(struct _Solver *solv);
131 extern void solver_reenablepolicyrules(struct _Solver *solv, int jobidx);
132 extern void solver_reenablepolicyrules_cleandeps(struct _Solver *solv, Id pkg);
133
134 /* rule info */
135 extern int solver_allruleinfos(struct _Solver *solv, Id rid, Queue *rq);
136 extern SolverRuleinfo solver_ruleinfo(struct _Solver *solv, Id rid, Id *fromp, Id *top, Id *depp);
137 extern SolverRuleinfo solver_ruleclass(struct _Solver *solv, Id rid);
138 extern void solver_ruleliterals(struct _Solver *solv, Id rid, Queue *q);
139 extern int  solver_rule2jobidx(struct _Solver *solv, Id rid);
140 extern Id   solver_rule2job(struct _Solver *solv, Id rid, Id *whatp);
141 extern Id   solver_rule2solvable(struct _Solver *solv, Id rid);
142 extern void solver_rule2rules(struct _Solver *solv, Id rid, Queue *q, int recursive);
143
144
145 #ifdef __cplusplus
146 }
147 #endif
148
149 #endif
150