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qpkg: some cleanup, prerequisite search speedup

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With the reduction of search depth, "prereq abiword" takes about 3 minutes
on my PC. (Obviously, this can still be improved.)

- gobble.c (gobble_buf): if pkg->id->value is NULL, just it as such
- prereq.c (push): abort if trying to consider a package already considered
  or installed
- prereq.c (conflicts): before being satisfied with using an installed
  package, make sure it really satisfies the requirement
- prereq.c (conflicts): abort if an installed package conflicts
- prereq.c (conflicts): added some debugging output (temporary)
- prereq.c (conflicts): cut the search if we can't do better than a
  previous match
This commit is contained in:
Werner Almesberger 2010-11-19 15:26:24 -03:00
parent fe14aa01d5
commit 0ca4751b77
2 changed files with 19 additions and 3 deletions
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2
qpkg/gobble.c
View File

@ -241,7 +241,7 @@ package:
WHITESPACE;
pkg = alloc_type(struct pkg);
pkg->id = ID(packages);
pkg->more = pkg->id->value ? pkg->id->value : NULL;
pkg->more = pkg->id->value;
pkg->id->value = pkg;
pkg->version = NULL;
pkg->filename = NULL;

20
qpkg/prereq.c
View File

@ -111,6 +111,7 @@ static void push(struct pkg *pkg)
}
stack[n_stack++] = pkg;
assert(!pkg->mark && !pkg->installed);
pkg->mark = 1;
}
@ -158,6 +159,7 @@ static int conflicts(const struct pkg *pkg, const struct list *conf)
static void resolve(struct list *next_dep, const struct ref *dep,
struct list *conf)
{
static int level = 0;
struct list more_deps;
struct list more_conf = {
.next = conf
@ -173,14 +175,27 @@ static void resolve(struct list *next_dep, const struct ref *dep,
next_dep = next_dep->next;
}
for (pkg = dep->pkg->value; pkg; pkg = pkg->more) {
if (best && n_stack == n_best)
return;
#if 0
fprintf(stderr, "%*s", level, "");
fprintf(stderr, "%.*s %p", ID2S(pkg->id), pkg);
if (pkg->version)
fprintf(stderr, " %.*s", ID2S(pkg->version));
if (pkg->mark) fprintf(stderr, " +");
if (pkg->installed) fprintf(stderr, " ***");
fprintf(stderr, "\n");
#endif
if (!satisfies(pkg, dep))
continue;
if (pkg->installed || pkg->mark) {
assert(!conflicts(pkg, conf));
resolve(next_dep, dep->next, conf);
continue;
}
if (!satisfies(pkg, dep))
continue;
if (conflicts(pkg, conf))
continue;
level++;
push(pkg);
more_deps.refs = pkg->depends;
more_deps.next = next_dep;
@ -189,6 +204,7 @@ static void resolve(struct list *next_dep, const struct ref *dep,
resolve(&more_deps, dep->next, &more_conf);
next_dep = more_deps.next;
pop();
level--;
}
}