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-rw-r--r--libbuild2/target.hxx36
1 files changed, 31 insertions, 5 deletions
diff --git a/libbuild2/target.hxx b/libbuild2/target.hxx
index 3d8c4ff..d3e88dd 100644
--- a/libbuild2/target.hxx
+++ b/libbuild2/target.hxx
@@ -380,7 +380,16 @@ namespace build2
// Most qualified scope that contains this target.
//
const scope&
- base_scope () const;
+ base_scope () const
+ {
+ if (ctx.phase != run_phase::load)
+ {
+ if (const scope* s = base_scope_.load (memory_order_consume))
+ return *s;
+ }
+
+ return base_scope_impl ();
+ }
// Root scope of a project that contains this target. Note that
// a target can be out of any (known) project root in which case
@@ -388,7 +397,10 @@ namespace build2
// then use base_scope().root_scope() expression instead.
//
const scope&
- root_scope () const;
+ root_scope () const
+ {
+ return *base_scope ().root_scope ();
+ }
// Root scope of a bundle amalgamation that contains this target. The
// same notes as to root_scope() apply.
@@ -414,6 +426,16 @@ namespace build2
return out_dir ().sub (s.out_path ());
}
+ // Implementation details (use above functions instead).
+ //
+ // Base scope cached value. Invalidated every time we switch to the load
+ // phase (which is the only phase where we may insert new scopes).
+ //
+ mutable atomic<const scope*> base_scope_ {nullptr};
+
+ const scope&
+ base_scope_impl () const;
+
// Prerequisites.
//
// We use an atomic-empty semantics that allows one to "swap in" a set of
@@ -1580,10 +1602,14 @@ namespace build2
// Note: not MT-safe so can only be used during serial execution.
//
public:
- using iterator = butl::map_iterator_adapter<map_type::const_iterator>;
+ using iterator = butl::map_iterator_adapter<map_type::iterator>;
+ using const_iterator = butl::map_iterator_adapter<map_type::const_iterator>;
+
+ iterator begin () {return map_.begin ();}
+ iterator end () {return map_.end ();}
- iterator begin () const {return map_.begin ();}
- iterator end () const {return map_.end ();}
+ const_iterator begin () const {return map_.begin ();}
+ const_iterator end () const {return map_.end ();}
size_t
size () const {return map_.size ();}