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solver: instead of tracking selected packages, score by requirer count for tiebreaking

cute-signatures
William Pitcock 2017-11-02 16:24:09 +00:00
parent f18c708183
commit 9165aa3894
2 changed files with 13 additions and 7 deletions
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1
src/apk_solver_data.h
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@ -54,7 +54,6 @@ struct apk_solver_package_state {
unsigned seen : 1;
unsigned pkg_available : 1;
unsigned pkg_selectable : 1;
unsigned pkg_selected : 1;
unsigned tag_ok : 1;
unsigned tag_preferred : 1;
unsigned dependencies_used : 1;

19
src/solver.c
View File

@ -299,10 +299,6 @@ static void apply_constraint(struct apk_solver_state *ss, struct apk_package *pp
if (is_provided)
inherit_pinning_and_flags(ss, pkg0, ppkg);
/* if a world-dependency is non-virtual, then the provider is going to be selected */
if (ppkg == NULL && dep->name == pkg0->name && pkg0->ss.pkg_selectable)
pkg0->ss.pkg_selected = 1;
}
}
@ -485,6 +481,17 @@ static void reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
name->name, name->ss.has_options, name->ss.reverse_deps_done);
}
static int count_requirers(const struct apk_package *pkg)
{
int cnt = pkg->name->ss.requirers;
struct apk_dependency *p;
foreach_array_item(p, pkg->provides)
cnt += p->name->ss.requirers;
return cnt;
}
static int compare_providers(struct apk_solver_state *ss,
struct apk_provider *pA, struct apk_provider *pB)
{
@ -591,8 +598,8 @@ static int compare_providers(struct apk_solver_state *ss,
if (r)
return r;
/* Prefer already selected package. */
r = pkgA->ss.pkg_selected - pkgB->ss.pkg_selected;
/* Prefer highest requirer count. */
r = count_requirers(pkgA) - count_requirers(pkgB);
if (r)
return r;