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pkgconf
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dependency: Fix reference counting of dependency_addraw 

We only want a reference to be added for the value inserted into the
list, not the one returned. The returned one is unowned until it reaches
the public dependency_add function, which returns an owned pointer
instead. This makes things semantically more correct.

Unfortunately, this means in a few cases we have to write some ugly
code like:
```c
pkgconf_dependency_t *dep = pkgcond_dependency_add("args");
pkgconf_dependency_unref(dep->owner, dep);
```
Dylan Baker 2022-08-03 15:43:04 -07:00
parent e41e464152
commit 388bd61a61
2 changed files with 15 additions and 7 deletions
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19
libpkgconf/dependency.c
View File

@ -113,9 +113,16 @@ add_or_replace_dependency_node(pkgconf_client_t *client, pkgconf_dependency_t *d
}
PKGCONF_TRACE(client, "added dependency [%s] to list @%p; flags=%x", dependency_to_str(dep, depbuf, sizeof depbuf), list, dep->flags);
pkgconf_node_insert_tail(&dep->iter, dep, list);
pkgconf_node_insert_tail(&dep->iter, pkgconf_dependency_ref(dep->owner, dep), list);
return pkgconf_dependency_ref(dep->owner, dep);
/* This dependency is intentionally unowned.
*
* Internally we have no use for the returned type, and usually just
* discard it. However, there is a publig pkgconf_dependency_add
* function, which references this return value before returning it,
* giving ownership at that point.
*/
return dep;
}
static inline pkgconf_dependency_t *
@ -156,10 +163,10 @@ pkgconf_dependency_addraw(pkgconf_client_t *client, pkgconf_list_t *list, const
pkgconf_dependency_t *
pkgconf_dependency_add(pkgconf_client_t *client, pkgconf_list_t *list, const char *package, const char *version, pkgconf_pkg_comparator_t compare, unsigned int flags)
{
if (version != NULL)
return pkgconf_dependency_addraw(client, list, package, strlen(package), version, strlen(version), compare, flags);
return pkgconf_dependency_addraw(client, list, package, strlen(package), NULL, 0, compare, flags);
pkgconf_dependency_t *dep;
dep = pkgconf_dependency_addraw(client, list, package, strlen(package), version,
version != NULL ? strlen(version) : 0, compare, flags);
return pkgconf_dependency_ref(dep->owner, dep);
}
/*

3
libpkgconf/pkg.c
View File

@ -451,7 +451,8 @@ pkgconf_pkg_new_from_file(pkgconf_client_t *client, const char *filename, FILE *
return NULL;
}
pkgconf_dependency_add(client, &pkg->provides, pkg->id, pkg->version, PKGCONF_CMP_EQUAL, 0);
pkgconf_dependency_t *dep = pkgconf_dependency_add(client, &pkg->provides, pkg->id, pkg->version, PKGCONF_CMP_EQUAL, 0);
pkgconf_dependency_unref(dep->owner, dep);
return pkgconf_pkg_ref(client, pkg);
}