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solver: fix backtracking 

We need to refresh all name states after backtracking as options
that were excluding due to topology ordering might have become
available.
cute-signatures
Timo Teräs 2011-09-22 13:09:23 +03:00
parent 78a372464b
commit 012bcbe41c
1 changed files with 33 additions and 32 deletions
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65
src/solver.c
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@ -41,6 +41,7 @@ struct apk_package_state {
struct apk_name_state {
struct list_head unsolved_list;
struct apk_name *name;
struct apk_package *chosen;
unsigned short requirers;
unsigned short install_ifs;
@ -51,7 +52,6 @@ struct apk_name_state {
unsigned int availability_checked : 1;
unsigned int locked : 1;
unsigned int no_options : 1;
};
struct apk_solver_state {
@ -64,7 +64,8 @@ struct apk_solver_state {
unsigned int assigned_names;
unsigned short cur_unsatisfiable;
unsigned short solver_flags;
unsigned int solver_flags : 4;
unsigned int refresh_name_states : 1;
struct apk_package_array *best_solution;
unsigned short best_unsatisfiable;
@ -82,9 +83,16 @@ static struct apk_package_state *pkg_to_ps(struct apk_package *pkg)
static struct apk_name_state *name_to_ns(struct apk_name *name)
{
if (name->state_ptr == NULL)
name->state_ptr = calloc(1, sizeof(struct apk_name_state));
return (struct apk_name_state*) name->state_ptr;
struct apk_name_state *ns;
if (name->state_ptr == NULL) {
ns = calloc(1, sizeof(struct apk_name_state));
ns->name = name;
name->state_ptr = ns;
} else {
ns = (struct apk_name_state*) name->state_ptr;
}
return ns;
}
static inline int pkg_available(struct apk_database *db, struct apk_package *pkg)
@ -339,16 +347,13 @@ static int install_if_missing(struct apk_solver_state *ss, struct apk_package *p
return missing;
}
static int update_name_state(struct apk_solver_state *ss,
struct apk_name *name, struct apk_name_state *ns,
int requirers_adjustment)
static int update_name_state(struct apk_solver_state *ss, struct apk_name *name)
{
struct apk_name_state *ns = name_to_ns(name);
struct apk_package *best_pkg = NULL;
unsigned int best_topology = 0;
int i, options = 0, skipped_options = 0;
ns->requirers += requirers_adjustment;
for (i = 0; i < name->pkgs->num; i++) {
struct apk_package *pkg0 = name->pkgs->item[i];
struct apk_package_state *ps0 = pkg_to_ps(pkg0);
@ -372,20 +377,7 @@ static int update_name_state(struct apk_solver_state *ss,
best_pkg = pkg0, best_topology = pkg0->topology_hard;
}
if (options == 0 && skipped_options == 0) {
if (!ns->no_options) {
ss->cur_unsatisfiable += ns->requirers;
if (ns->install_ifs)
ss->cur_unsatisfiable++;
ns->no_options = 1;
} else if (requirers_adjustment > 0) {
ss->cur_unsatisfiable += requirers_adjustment;
}
} else
ns->no_options = 0;
if ((options == 0 && skipped_options == 0) ||
(ns->requirers == 0 && ns->install_ifs == 0)) {
if (ns->requirers == 0 && ns->install_ifs == 0) {
if (list_hashed(&ns->unsolved_list)) {
list_del(&ns->unsolved_list);
list_init(&ns->unsolved_list);
@ -414,7 +406,7 @@ static void trigger_install_if(struct apk_solver_state *ss,
dbg_printf("trigger_install_if: " PKG_VER_FMT " triggered\n",
PKG_VER_PRINTF(pkg));
ns->install_ifs++;
update_name_state(ss, pkg->name, ns, 0);
update_name_state(ss, pkg->name);
}
}
@ -427,7 +419,7 @@ static void untrigger_install_if(struct apk_solver_state *ss,
dbg_printf("untrigger_install_if: " PKG_VER_FMT " no longer triggered\n",
PKG_VER_PRINTF(pkg));
ns->install_ifs--;
update_name_state(ss, pkg->name, ns, 0);
update_name_state(ss, pkg->name);
}
}
@ -454,7 +446,7 @@ static void apply_decision(struct apk_solver_state *ss,
foreach_dependency(ss, pkg->depends, apply_constraint);
foreach_rinstall_if_pkg(ss, pkg, trigger_install_if);
} else {
update_name_state(ss, pkg->name, ns, 0);
update_name_state(ss, pkg->name);
}
}
@ -483,7 +475,7 @@ static void undo_decision(struct apk_solver_state *ss,
}
ss->cur_unsatisfiable = ps->cur_unsatisfiable;
update_name_state(ss, pkg->name, ns, 0);
update_name_state(ss, pkg->name);
}
static void push_decision(struct apk_solver_state *ss, struct apk_package *pkg,
@ -533,6 +525,7 @@ static int next_branch(struct apk_solver_state *ss)
ss->topology_position);
ps->flags &= ~(APK_PKGSTF_ALT_BRANCH | APK_PKGSTF_DECIDED);
ss->latest_decision = ps->backtrack;
ss->refresh_name_states = 1;
} else {
dbg_printf("next_branch: swapping BRANCH at topology_position %d\n",
ss->topology_position);
@ -619,8 +612,9 @@ static void apply_constraint(struct apk_solver_state *ss, struct apk_dependency
if (ss->latest_decision != NULL)
inherit_name_state(name, ss->latest_decision->name);
update_name_state(ss, name, ns,
(dep->result_mask != APK_DEPMASK_CONFLICT) ? 1 : 0);
if (dep->result_mask != APK_DEPMASK_CONFLICT)
ns->requirers++;
update_name_state(ss, name);
}
static void undo_constraint(struct apk_solver_state *ss, struct apk_dependency *dep)
@ -653,8 +647,9 @@ static void undo_constraint(struct apk_solver_state *ss, struct apk_dependency *
if (ss->latest_decision && has_inherited_state(ss->latest_decision->name))
recalculate_inherted_name_state(name);
update_name_state(ss, name, ns,
(dep->result_mask != APK_DEPMASK_CONFLICT) ? -1 : 0);
if (dep->result_mask != APK_DEPMASK_CONFLICT)
ns->requirers--;
update_name_state(ss, name);
}
static int expand_branch(struct apk_solver_state *ss)
@ -665,6 +660,9 @@ static int expand_branch(struct apk_solver_state *ss)
/* FIXME: change unsolved_list to a priority queue */
list_for_each_entry(ns, &ss->unsolved_list_head, unsolved_list) {
if (ss->refresh_name_states)
update_name_state(ss, ns->name);
/* ns->chosen can be NULL if the name has only install_if
* requirers that got later conflicted, but it still has
* other options that can get activated later due to more
@ -677,7 +675,10 @@ static int expand_branch(struct apk_solver_state *ss)
else if (ns->chosen->topology_hard > topology0)
pkg0 = ns->chosen, topology0 = pkg0->topology_hard;
}
ss->refresh_name_states = 0;
if (pkg0 == NULL) {
list_for_each_entry(ns, &ss->unsolved_list_head, unsolved_list)
ss->cur_unsatisfiable += ns->requirers;
dbg_printf("expand_branch: list is empty (%d unsatisfied)\n",
ss->cur_unsatisfiable);
return 1;