Simplify scheduler API by removing zone scopes.

src/compiler/scheduler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <deque>
 #include <queue>
 
 #include "src/compiler/scheduler.h"
 
 #include "src/bit-vector.h"
@@ skipping 20 matching lines @@
 Scheduler::Scheduler(Zone* zone, Graph* graph, Schedule* schedule)
     : zone_(zone),
       graph_(graph),
       schedule_(schedule),
       scheduled_nodes_(zone),
       schedule_root_nodes_(zone),
       schedule_queue_(zone),
       node_data_(graph_->NodeCount(), DefaultSchedulerData(), zone) {}
 
 
-Schedule* Scheduler::ComputeSchedule(ZonePool* zone_pool, Graph* graph) {
-  ZonePool::Scope zone_scope(zone_pool);
+Schedule* Scheduler::ComputeSchedule(Zone* zone, Graph* graph) {
   Schedule* schedule = new (graph->zone())
       Schedule(graph->zone(), static_cast<size_t>(graph->NodeCount()));
-  Scheduler scheduler(zone_scope.zone(), graph, schedule);
+  Scheduler scheduler(zone, graph, schedule);
 
   scheduler.BuildCFG();
   scheduler.ComputeSpecialRPONumbering();
   scheduler.GenerateImmediateDominatorTree();
 
   scheduler.PrepareUses();
   scheduler.ScheduleEarly();
   scheduler.ScheduleLate();
 
   scheduler.SealFinalSchedule();
@@ skipping 962 matching lines @@
   Schedule* schedule_;
   BlockList* order_;
   ZoneVector<LoopInfo> loops_;
   BasicBlock* beyond_end_;
   ZoneList<Backedge> backedges_;
   ZoneVector<SpecialRPOStackFrame> stack_;
   size_t previous_block_count_;
 };
 
 
-BasicBlockVector* Scheduler::ComputeSpecialRPO(ZonePool* zone_pool,
-                                               Schedule* schedule) {
-  ZonePool::Scope zone_scope(zone_pool);
-  Zone* zone = zone_scope.zone();
-
+BasicBlockVector* Scheduler::ComputeSpecialRPO(Zone* zone, Schedule* schedule) {
   SpecialRPONumberer numberer(zone, schedule);
   numberer.ComputeSpecialRPO();
   numberer.SerializeAOIntoSchedule();
   numberer.SerializeRPOIntoSchedule();
   numberer.PrintAndVerifySpecialRPO();
   return schedule->rpo_order();
 }
 
 
 void Scheduler::ComputeSpecialRPONumbering() {
@@ skipping 431 matching lines @@
   for (NodeVectorIter i = nodes->begin(); i != nodes->end(); ++i) {
     schedule_->SetBlockForNode(to, *i);
     scheduled_nodes_[to->id().ToSize()].push_back(*i);
   }
   nodes->clear();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8