diff options
Diffstat (limited to 'libbuild2/algorithm.cxx')
| -rw-r--r-- | libbuild2/algorithm.cxx | 322 |
1 files changed, 220 insertions, 102 deletions
diff --git a/libbuild2/algorithm.cxx b/libbuild2/algorithm.cxx index 01d5016..bc4b835 100644 --- a/libbuild2/algorithm.cxx +++ b/libbuild2/algorithm.cxx @@ -232,8 +232,14 @@ namespace build2 // If the work_queue is absent, then we don't wait. // + // While already applied or executed targets are normally not locked, if + // options contain any bits that are not already in cur_options, then the + // target is locked even in these states. + // target_lock - lock_impl (action a, const target& ct, optional<scheduler::work_queue> wq) + lock_impl (action a, const target& ct, + optional<scheduler::work_queue> wq, + uint64_t options) { context& ctx (ct.ctx); @@ -248,7 +254,8 @@ namespace build2 size_t appl (b + target::offset_applied); size_t busy (b + target::offset_busy); - atomic_count& task_count (ct[a].task_count); + const target::opstate& cs (ct[a]); + atomic_count& task_count (cs.task_count); while (!task_count.compare_exchange_strong ( e, @@ -281,9 +288,10 @@ namespace build2 e = ctx.sched->wait (busy - 1, task_count, u, *wq); } - // We don't lock already applied or executed targets. + // We don't lock already applied or executed targets unless there + // are new options. // - if (e >= appl) + if (e >= appl && (cs.match_extra.cur_options & options) == options) return target_lock {a, nullptr, e - b, false}; } @@ -304,12 +312,7 @@ namespace build2 offset = target::offset_touched; } else - { offset = e - b; - assert (offset == target::offset_touched || - offset == target::offset_tried || - offset == target::offset_matched); - } return target_lock {a, &t, offset, first}; } @@ -448,7 +451,7 @@ namespace build2 auto match = [a, &t, &me] (const adhoc_rule& r, bool fallback) -> bool { - me.init (fallback); + me.reinit (fallback); if (auto* f = (a.outer () ? t.ctx.current_outer_oif @@ -550,10 +553,11 @@ namespace build2 // Return the matching rule or NULL if no match and try_match is true. // const rule_match* - match_rule (action a, target& t, - const rule* skip, - bool try_match, - match_extra* pme) + match_rule_impl (action a, target& t, + uint64_t options, + const rule* skip, + bool try_match, + match_extra* pme) { using fallback_rule = adhoc_rule_pattern::fallback_rule; @@ -567,6 +571,12 @@ namespace build2 return dynamic_cast<const fallback_rule*> (&r.second.get ()); }; + // Note: we copy the options value to me.new_options after successfully + // matching the rule to make sure rule::match() implementations don't rely + // on it. + // + match_extra& me (pme == nullptr ? t[a].match_extra : *pme); + if (const target* g = t.group) { // If this is a group with dynamic members, then match it with the @@ -580,6 +590,8 @@ namespace build2 { const rule_match* r (g->state[a].rule); assert (r != nullptr); // Shouldn't happen with dyn_members. + + me.new_options = options; return r; } @@ -587,8 +599,8 @@ namespace build2 } // If this is a member of group-based target, then first try to find a - // matching ad hoc recipe/rule by matching (to an ad hoc recipe/rule) the - // group but applying to the member. See adhoc_rule::match() for + // matching ad hoc recipe/rule by matching (to an ad hoc recipe/rule) + // the group but applying to the member. See adhoc_rule::match() for // background, including for why const_cast should be safe. // // To put it another way, if a group is matched by an ad hoc @@ -603,10 +615,16 @@ namespace build2 // We cannot init match_extra from the target if it's unlocked so use // a temporary (it shouldn't be modified if unlocked). // - match_extra me (false /* locked */); - if (const rule_match* r = match_rule ( - a, const_cast<target&> (*g), skip, true /* try_match */, &me)) + match_extra gme (false /* locked */); + if (const rule_match* r = match_rule_impl (a, const_cast<target&> (*g), + 0 /* options */, + skip, + true /* try_match */, + &gme)) + { + me.new_options = options; return r; + } // Fall through to normal match of the member. } @@ -620,8 +638,6 @@ namespace build2 if (const scope* rs = bs.root_scope ()) penv = auto_project_env (*rs); - match_extra& me (pme == nullptr ? t[a].match_extra : *pme); - // First check for an ad hoc recipe. // // Note that a fallback recipe is preferred over a non-fallback rule. @@ -629,7 +645,10 @@ namespace build2 if (!t.adhoc_recipes.empty ()) { if (const rule_match* r = match_adhoc_recipe (a, t, me)) + { + me.new_options = options; return r; + } } // If this is an outer operation (Y-for-X), then we look for rules @@ -744,8 +763,9 @@ namespace build2 } } - // Skip non-ad hoc rules if the target is not locked (see - // above). + // Skip non-ad hoc rules if the target is not locked (see above; + // note that in this case match_extra is a temporary which we + // can reinit). // if (!me.locked && !adhoc_rule_match (*r)) continue; @@ -756,7 +776,7 @@ namespace build2 if (&ru == skip) continue; - me.init (oi == 0 /* fallback */); + me.reinit (oi == 0 /* fallback */); { auto df = make_diag_frame ( [a, &t, &n](const diag_record& dr) @@ -825,7 +845,10 @@ namespace build2 } if (!ambig) + { + me.new_options = options; return r; + } else dr << info << "use rule hint to disambiguate this match"; } @@ -938,10 +961,39 @@ namespace build2 recipe re (ar != nullptr ? f (*ar, a, t, me) : ru.apply (a, t, me)); - me.free (); + me.free (); // Note: cur_options are still in use. return re; } + static void + reapply_impl (action a, + target& t, + const pair<const string, reference_wrapper<const rule>>& m) + { + const scope& bs (t.base_scope ()); + + // Reapply rules in project environment. + // + auto_project_env penv; + if (const scope* rs = bs.root_scope ()) + penv = auto_project_env (*rs); + + const rule& ru (m.second); + match_extra& me (t[a].match_extra); + + auto df = make_diag_frame ( + [a, &t, &m](const diag_record& dr) + { + if (verb != 0) + dr << info << "while reapplying rule " << m.first << " to " + << diag_do (a, t); + }); + + // Note: for now no adhoc_reapply(). + // + ru.reapply (a, t, me); + } + // If anything goes wrong, set target state to failed and return false. // // Note: must be called while holding target_lock. @@ -1029,10 +1081,24 @@ namespace build2 // the first half of the result. // static pair<bool, target_state> - match_impl (target_lock& l, - bool step = false, - bool try_match = false) + match_impl_impl (target_lock& l, + uint64_t options, + bool step = false, + bool try_match = false) { + // With regards to options, the semantics that we need to achieve for each + // target::offeset_*: + // + // tried -- nothing to do (no match) + // touched -- set to new_options + // matched -- add to new_options + // applied -- reapply if any new options + // executed -- check and fail if any new options + // busy -- postpone until *_complete() call + // + // Note that if options is 0 (see resolve_{members,group}_impl()), then + // all this can be skipped. + assert (l.target != nullptr); action a (l.action); @@ -1045,10 +1111,6 @@ namespace build2 // if (t.adhoc_group_member ()) { - assert (!step); - - const target& g (*t.group); - // It feels natural to "convert" this call to the one for the group, // including the try_match part. Semantically, we want to achieve the // following: @@ -1056,6 +1118,29 @@ namespace build2 // [try_]match (a, g); // match_recipe (l, group_recipe); // + // Currently, ad hoc group members cannot have options. An alternative + // semantics could be to call the goup's rule to translate member + // options to group options and then (re)match the group with that. + // The implementation of this semantics could look like this: + // + // 1. Lock the group. + // 2. If not already offset_matched, do one step to get the rule. + // 3. Call the rule to translate options. + // 4. Continue matching the group passing the translated options. + // 5. Keep track of member options in member's cur_options to handle + // member rematches (if already offset_{applied,executed}). + // + // Note: see also similar semantics but for explicit groups in + // adhoc-rule-*.cxx. + + assert (!step && options == match_extra::all_options); + + const target& g (*t.group); + + // What should we do with options? After some rumination it fells most + // natural to treat options for the group and for its ad hoc member as + // the same entity ... or not. + // auto df = make_diag_frame ( [a, &t](const diag_record& dr) { @@ -1063,14 +1148,22 @@ namespace build2 dr << info << "while matching group rule to " << diag_do (a, t); }); - pair<bool, target_state> r (match_impl (a, g, 0, nullptr, try_match)); + pair<bool, target_state> r ( + match_impl (a, g, 0 /* options */, 0, nullptr, try_match)); if (r.first) { if (r.second != target_state::failed) { + // Note: in particular, passing all_options makes sure we will + // never re-lock this member if already applied/executed. + // match_inc_dependents (a, g); - match_recipe (l, group_recipe); + match_recipe (l, group_recipe, match_extra::all_options); + + // Note: no need to call match_posthoc() since an ad hoc member + // has no own prerequisites and the group's ones will be matched + // by the group. } } else @@ -1103,7 +1196,8 @@ namespace build2 // clear_target (a, t); - const rule_match* r (match_rule (a, t, nullptr, try_match)); + const rule_match* r ( + match_rule_impl (a, t, options, nullptr, try_match)); assert (l.offset != target::offset_tried); // Should have failed. @@ -1125,25 +1219,67 @@ namespace build2 // Fall through. case target::offset_matched: { + // Add any new options. + // + s.match_extra.new_options |= options; + // Apply. // set_recipe (l, apply_impl (a, t, *s.rule)); l.offset = target::offset_applied; + + if (t.has_group_prerequisites ()) // Ok since already matched. + { + if (!match_posthoc (a, t)) + s.state = target_state::failed; + } + + break; + } + case target::offset_applied: + { + // Reapply if any new options. + // + match_extra& me (s.match_extra); + me.new_options = options & ~me.cur_options; // Clear existing. + assert (me.new_options != 0); // Otherwise should not have locked. + + // Feels like this can only be a logic bug since to end up with a + // subset of options requires a rule (see match_extra for details). + // + assert (s.rule != nullptr); + + reapply_impl (a, t, *s.rule); break; } + case target::offset_executed: + { + // Diagnose new options after execute. + // + match_extra& me (s.match_extra); + assert ((me.cur_options & options) != options); // Otherwise no lock. + + fail << "change of match options after " << diag_do (a, t) + << " has been executed" << + info << "executed options 0x" << hex << me.cur_options << + info << "requested options 0x" << hex << options << endf; + } default: assert (false); } } catch (const failed&) { + s.state = target_state::failed; + l.offset = target::offset_applied; + } + + if (s.state == target_state::failed) + { // As a sanity measure clear the target data since it can be incomplete // or invalid (mark()/unmark() should give you some ideas). // clear_target (a, t); - - s.state = target_state::failed; - l.offset = target::offset_applied; } return make_pair (true, s.state); @@ -1153,10 +1289,9 @@ namespace build2 // the first half of the result. // pair<bool, target_state> - match_impl (action a, - const target& ct, - size_t start_count, - atomic_count* task_count, + match_impl (action a, const target& ct, + uint64_t options, + size_t start_count, atomic_count* task_count, bool try_match) { // If we are blocking then work our own queue one task at a time. The @@ -1178,30 +1313,16 @@ namespace build2 ct, task_count == nullptr ? optional<scheduler::work_queue> (scheduler::work_none) - : nullopt)); + : nullopt, + options)); if (l.target != nullptr) { - assert (l.offset < target::offset_applied); // Shouldn't lock otherwise. - if (try_match && l.offset == target::offset_tried) return make_pair (false, target_state::unknown); if (task_count == nullptr) - { - pair<bool, target_state> r (match_impl (l, false /*step*/, try_match)); - - if (r.first && - r.second != target_state::failed && - l.offset == target::offset_applied && - ct.has_group_prerequisites ()) // Already matched. - { - if (!match_posthoc (a, *l.target)) - r.second = target_state::failed; - } - - return r; - } + return match_impl_impl (l, options, false /* step */, try_match); // Pass "disassembled" lock since the scheduler queue doesn't support // task destruction. @@ -1211,12 +1332,18 @@ namespace build2 // Also pass our diagnostics and lock stacks (this is safe since we // expect the caller to wait for completion before unwinding its stack). // + // Note: pack captures and arguments a bit to reduce the storage space + // requrements. + // + bool first (ld.first); + if (ct.ctx.sched->async ( start_count, *task_count, - [a, try_match] (const diag_frame* ds, - const target_lock* ls, - target& t, size_t offset, bool first) + [a, try_match, first] (const diag_frame* ds, + const target_lock* ls, + target& t, size_t offset, + uint64_t options) { // Switch to caller's diag and lock stacks. // @@ -1230,24 +1357,15 @@ namespace build2 // Note: target_lock must be unlocked within the match phase. // target_lock l {a, &t, offset, first}; // Reassemble. - - pair<bool, target_state> r ( - match_impl (l, false /* step */, try_match)); - - if (r.first && - r.second != target_state::failed && - l.offset == target::offset_applied && - t.has_group_prerequisites ()) // Already matched. - match_posthoc (a, t); + match_impl_impl (l, options, false /* step */, try_match); } } catch (const failed&) {} // Phase lock failure. }, diag_frame::stack (), target_lock::stack (), - ref (*ld.target), - ld.offset, - ld.first)) + ref (*ld.target), ld.offset, + options)) return make_pair (true, target_state::postponed); // Queued. // Matched synchronously, fall through. @@ -1266,16 +1384,28 @@ namespace build2 } void - match_only_sync (action a, const target& t) + match_only_sync (action a, const target& t, uint64_t options) { assert (t.ctx.phase == run_phase::match); - target_lock l (lock_impl (a, t, scheduler::work_none)); + target_lock l (lock_impl (a, t, scheduler::work_none, options)); - if (l.target != nullptr && l.offset < target::offset_matched) + if (l.target != nullptr) { - if (match_impl (l, true /* step */).second == target_state::failed) - throw failed (); + if (l.offset != target::offset_matched) + { + if (match_impl_impl (l, + options, + true /* step */).second == target_state::failed) + throw failed (); + } + else + { + // If the target is already matched, then we need to add any new + // options but not call apply() (thus cannot use match_impl_impl()). + // + (*l.target)[a].match_extra.new_options |= options; + } } } @@ -1299,11 +1429,11 @@ namespace build2 { // Match (locked). // - if (match_impl (l, true /* step */).second == target_state::failed) + if (match_impl_impl (l, + 0 /* options */, + true /* step */).second == target_state::failed) throw failed (); - // Note: only matched so no call to match_posthoc(). - if ((r = g.group_members (a)).members != nullptr) break; @@ -1314,14 +1444,8 @@ namespace build2 { // Apply (locked). // - pair<bool, target_state> s (match_impl (l, true /* step */)); - - if (s.second != target_state::failed && - g.has_group_prerequisites ()) // Already matched. - { - if (!match_posthoc (a, *l.target)) - s.second = target_state::failed; - } + pair<bool, target_state> s ( + match_impl_impl (l, 0 /* options */, true /* step */)); if (s.second == target_state::failed) throw failed (); @@ -1435,21 +1559,15 @@ namespace build2 // Note: lock is a reference to avoid the stacking overhead. // void - resolve_group_impl (action a, const target& t, target_lock&& l) + resolve_group_impl (target_lock&& l) { - assert (a.inner ()); + assert (l.action.inner ()); pair<bool, target_state> r ( - match_impl (l, true /* step */, true /* try_match */)); - - if (r.first && - r.second != target_state::failed && - l.offset == target::offset_applied && - t.has_group_prerequisites ()) // Already matched. - { - if (!match_posthoc (a, *l.target)) - r.second = target_state::failed; - } + match_impl_impl (l, + 0 /* options */, + true /* step */, + true /* try_match */)); l.unlock (); |