diff options
Diffstat (limited to 'libbuild2/target.hxx')
| -rw-r--r-- | libbuild2/target.hxx | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/libbuild2/target.hxx b/libbuild2/target.hxx index 01e82bb..428b4a0 100644 --- a/libbuild2/target.hxx +++ b/libbuild2/target.hxx @@ -170,6 +170,7 @@ namespace build2 // struct match_extra { + bool locked; // Normally true (see adhoc_rule::match() for background). bool fallback; // True if matching a fallback rule (see match_rule()). // Auxiliary data storage. @@ -237,7 +238,12 @@ namespace build2 // Implementation details. // + // NOTE: see match_rule() in algorithms.cxx if changing anything here. + // public: + explicit + match_extra (bool l = true, bool f = false): locked (l), fallback (f) {} + void init (bool fallback); @@ -852,8 +858,11 @@ namespace build2 // Return true if the target has been matched for the specified action. // This function can only be called during the match or execute phases. // + // If you need to observe something in the matched target (e.g., the + // matched rule), use memory_order_acquire. + // bool - matched (action) const; + matched (action, memory_order mo = memory_order_relaxed) const; // This function can only be called during match if we have observed // (synchronization-wise) that this target has been matched (i.e., the @@ -2160,15 +2169,34 @@ namespace build2 // Note that it is not see-through but a derived group can be made see- // through via the [see_through] attribute. // - // Note that normally you wouldn't use it as a base for a custom group - // defined in C++, instead deriving from mtime_target directly and using a - // custom members layout more appropriate for the group's semantics. + // Note also that you shouldn't use it as a base for a custom group defined + // in C++, instead deriving from mtime_target directly and using a custom + // members layout more appropriate for the group's semantics. To put it + // another way, a group-based target should only be matched by an ad hoc + // recipe/rule (see match_rule() in algorithms.cxx for details). // class LIBBUILD2_SYMEXPORT group: public mtime_target { public: vector<reference_wrapper<const target>> static_members; + // Note: we expect no NULL entries in members. + // + vector<const target*> members; // Layout compatible with group_view. + action members_action; // Action on which members were resolved. + size_t members_on = 0; // Operation number on which members were resolved. + + void + reset_members (action a) + { + members.clear (); + members_action = a; + members_on = ctx.current_on; + } + + virtual group_view + group_members (action) const override; + group (context& c, dir_path d, dir_path o, string n) : mtime_target (c, move (d), move (o), move (n)) { |