aboutsummaryrefslogtreecommitdiff
path: root/libbuild2/config/utility.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'libbuild2/config/utility.cxx')
-rw-r--r--libbuild2/config/utility.cxx33
1 files changed, 33 insertions, 0 deletions
diff --git a/libbuild2/config/utility.cxx b/libbuild2/config/utility.cxx
index a78b263..7437c5b 100644
--- a/libbuild2/config/utility.cxx
+++ b/libbuild2/config/utility.cxx
@@ -156,5 +156,38 @@ namespace build2
else
return false;
}
+
+ pair<variable_origin, lookup>
+ origin (const scope& rs, const string& n)
+ {
+ // Make sure this is a config.* variable. This could matter since we
+ // reply on the semantics of value::extra. We could also detect
+ // special variables like config.booted, some config.config.*, etc.,
+ // (see config_save() for details) but that seems harmless.
+ //
+ if (n.compare (0, 7, "config.") != 0)
+ throw invalid_argument ("config.* variable expected");
+
+ const variable* var (rs.ctx.var_pool.find (n));
+
+ if (var == nullptr)
+ return make_pair (variable_origin::undefined, lookup ());
+
+ pair<lookup, size_t> org (rs.lookup_original (*var));
+ pair<lookup, size_t> ovr (var->overrides == nullptr
+ ? org
+ : rs.lookup_override (*var, org));
+
+ if (!ovr.first.defined ())
+ return make_pair (variable_origin::undefined, lookup ());
+
+ if (org.first != ovr.first)
+ return make_pair (variable_origin::override_, ovr.first);
+
+ return make_pair (org.first->extra
+ ? variable_origin::default_
+ : variable_origin::buildfile,
+ org.first);
+ }
}
}