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solver: record dependency apk_name in apk_decision 

We can't just use the primary name, as that would mess up
backtracking. We need to record the name which caused the name
to get considered - that way the right last_touched_decision is
used on backtracking.
cute-signatures
Timo Teräs 2012-10-05 15:45:40 +03:00
parent 4dd8c58df9
commit bc7e8f5da8
1 changed files with 19 additions and 51 deletions
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70
src/solver.c
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@ -71,16 +71,13 @@ enum {
};
struct apk_decision {
union {
struct apk_name *name;
struct apk_package *pkg;
};
struct apk_name *name;
struct apk_package *pkg;
#ifdef DEBUG_CHECKS
struct apk_score saved_score;
unsigned short saved_requirers;
#endif
unsigned no_package : 1;
unsigned type : 1;
unsigned branching_point : 1;
unsigned topology_position : 1;
@ -195,20 +192,6 @@ static inline int cmpscore2(struct apk_score *a1, struct apk_score *a2, struct a
return 0;
}
static struct apk_name *decision_to_name(struct apk_decision *d)
{
if (d->no_package)
return d->name;
return d->pkg->name;
}
static struct apk_package *decision_to_pkg(struct apk_decision *d)
{
if (d->no_package)
return NULL;
return d->pkg;
}
static struct apk_package_state *pkg_to_ps(struct apk_package *pkg)
{
return (struct apk_package_state*) pkg->state_ptr;
@ -737,8 +720,8 @@ static inline void unassign_name(struct apk_solver_state *ss, struct apk_name *n
static solver_result_t apply_decision(struct apk_solver_state *ss,
struct apk_decision *d)
{
struct apk_name *name = decision_to_name(d);
struct apk_package *pkg = decision_to_pkg(d);
struct apk_name *name = d->name;
struct apk_package *pkg = d->pkg;
struct apk_score score;
int i;
@ -827,8 +810,8 @@ static solver_result_t apply_decision(struct apk_solver_state *ss,
static void undo_decision(struct apk_solver_state *ss,
struct apk_decision *d)
{
struct apk_name *name = decision_to_name(d);
struct apk_package *pkg = decision_to_pkg(d);
struct apk_name *name = d->name;
struct apk_package *pkg = d->pkg;
struct apk_score score;
int i;
@ -859,7 +842,7 @@ static void undo_decision(struct apk_solver_state *ss,
get_topology_score(ss, pkg, &score);
subscore(&ss->score, &score);
unassign_name(ss, name);
unassign_name(ss, pkg->name);
for (i = 0; i < pkg->provides->num; i++) {
struct apk_dependency *p = &pkg->provides->item[i];
unassign_name(ss, p->name);
@ -894,9 +877,6 @@ static solver_result_t push_decision(struct apk_solver_state *ss,
{
struct apk_decision *d;
ASSERT(pkg == NULL || pkg->name == name,
"push_decision got non-primary name: %s != %s",
pkg->name->name, name->name);
ASSERT(ss->num_decisions <= ss->max_decisions,
"Decision tree overflow.");
@ -913,19 +893,8 @@ static solver_result_t push_decision(struct apk_solver_state *ss,
d->branching_point = branching_point;
d->topology_position = topology_position;
d->found_solution = 0;
if (pkg == NULL) {
d->name = name;
d->no_package = 1;
} else {
d->pkg = pkg;
d->no_package = 0;
}
/* FIXME: this is needed for virtual packages - should possible
* consider making backtracking information also keep the
* virtual apk_name causing the touched information to be more
* accurate */
if (name->ss.last_touched_decision == 0)
name->ss.last_touched_decision = ss->num_decisions;
d->name = name;
d->pkg = pkg;
return apply_decision(ss, d);
}
@ -936,7 +905,7 @@ static int next_branch(struct apk_solver_state *ss)
while (ss->num_decisions > 0) {
struct apk_decision *d = &ss->decisions[ss->num_decisions];
struct apk_name *name = decision_to_name(d);
struct apk_name *name = d->name;
undo_decision(ss, d);
@ -961,7 +930,7 @@ static int next_branch(struct apk_solver_state *ss)
name->name, backup_until, ss->num_decisions);
}
if (d->no_package && !d->found_solution) {
if (d->pkg == NULL && !d->found_solution) {
if (name->ss.last_touched_decision < backup_until)
backup_until = name->ss.last_touched_decision;
}
@ -980,8 +949,8 @@ static void apply_constraint(struct apk_solver_state *ss, struct apk_dependency
int i, strength, changed = 0;
if (ss->num_decisions > 0) {
requirer_name = decision_to_name(&ss->decisions[ss->num_decisions]);
requirer_pkg = decision_to_pkg(&ss->decisions[ss->num_decisions]);
requirer_name = ss->decisions[ss->num_decisions].name;
requirer_pkg = ss->decisions[ss->num_decisions].pkg;
/* FIXME: should probably take into account the requirer
* package's provided name's 'requirer strength' */
strength = requirer_name->ss.requirers ?: 1;
@ -1059,8 +1028,8 @@ static void undo_constraint(struct apk_solver_state *ss, struct apk_dependency *
int i, strength;
if (ss->num_decisions > 0) {
requirer_name = decision_to_name(&ss->decisions[ss->num_decisions]);
requirer_pkg = decision_to_pkg(&ss->decisions[ss->num_decisions]);
requirer_name = ss->decisions[ss->num_decisions].name;
requirer_pkg = ss->decisions[ss->num_decisions].pkg;
strength = requirer_name->ss.requirers ?: 1;
} else {
strength = 1;
@ -1179,7 +1148,7 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
/* viable alternative? */
if (cmpscore2(&ss->score, &pkg0_score, &ss->best_score) >= 0)
return push_decision(ss, pkg0->name, pkg0, DECISION_EXCLUDE, BRANCH_NO, FALSE);
return push_decision(ss, name, pkg0, DECISION_EXCLUDE, BRANCH_NO, FALSE);
if (cmpscore(&pkg0_score, &best_score) < 0) {
best_score = pkg0_score;
@ -1204,10 +1173,9 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
return SOLVERR_PRUNED;
return push_decision(ss, name, NULL, DECISION_ASSIGN, BRANCH_NO, FALSE);
} else if (options == 1 && score_locked && name->ss.none_excluded && name == next_p->pkg->name) {
struct apk_package *pkg0 = next_p->pkg;
dbg_printf("reconsider_name: %s: only one choice left with known score, locking.\n",
name->name);
return push_decision(ss, pkg0->name, pkg0, DECISION_ASSIGN, BRANCH_NO, FALSE);
return push_decision(ss, name, next_p->pkg, DECISION_ASSIGN, BRANCH_NO, FALSE);
}
name->ss.chosen = *next_p;
@ -1339,8 +1307,8 @@ static void record_solution(struct apk_solver_state *ss)
n = 0;
for (i = ss->num_decisions; i > 0; i--) {
struct apk_decision *d = &ss->decisions[i];
struct apk_name *name = decision_to_name(d);
struct apk_package *pkg = decision_to_pkg(d);
struct apk_name *name = d->name;
struct apk_package *pkg = d->pkg;
struct apk_package_state *ps;
unsigned short pinning;
unsigned int repos;