Add Zone-based handle allocation interface and reduce use of Isolate-based interfaces.

runtime/vm/flow_graph_allocator.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_allocator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/intermediate_language.h"
 #include "vm/il_printer.h"
 #include "vm/flow_graph.h"
@@ skipping 522 matching lines @@
     use = use->next();
   }
   return true;
 }
 
 
 void FlowGraphAllocator::BuildLiveRanges() {
   const intptr_t block_count = postorder_.length();
   ASSERT(postorder_.Last()->IsGraphEntry());
   BitVector* current_interference_set = NULL;
-  Isolate* isolate = flow_graph_.isolate();
+  Zone* zone = flow_graph_.zone();
   for (intptr_t i = 0; i < (block_count - 1); i++) {
     BlockEntryInstr* block = postorder_[i];
 
     BlockInfo* block_info = BlockInfoAt(block->start_pos());
 
     // For every SSA value that is live out of this block, create an interval
     // that covers the whole block.  It will be shortened if we encounter a
     // definition of this value in this block.
     for (BitVector::Iterator it(liveness_.GetLiveOutSetAt(i));
          !it.Done();
          it.Advance()) {
       LiveRange* range = GetLiveRange(it.Current());
       range->AddUseInterval(block->start_pos(), block->end_pos());
     }
 
     BlockInfo* loop_header = block_info->loop_header();
     if ((loop_header != NULL) && (loop_header->last_block() == block)) {
-      current_interference_set = new(isolate) BitVector(
-          isolate, flow_graph_.max_virtual_register_number());
+      current_interference_set = new(zone) BitVector(
+          zone, flow_graph_.max_virtual_register_number());
       ASSERT(loop_header->backedge_interference() == NULL);
       // All values flowing into the loop header are live at the back-edge and
       // can interfere with phi moves.
       current_interference_set->AddAll(
           liveness_.GetLiveInSet(loop_header->entry()));
       loop_header->set_backedge_interference(
           current_interference_set);
     }
 
     // Connect outgoing phi-moves that were created in NumberInstructions
@@ skipping 302 matching lines @@
     //
 
     if (env->Length() == 0) {
       env = env->outer();
       continue;
     }
 
     const intptr_t block_start_pos = block->start_pos();
     const intptr_t use_pos = current->lifetime_position() + 1;
 
-    Location* locations =
-        Isolate::Current()->current_zone()->Alloc<Location>(env->Length());
+    Location* locations = flow_graph_.zone()->Alloc<Location>(env->Length());
 
     for (intptr_t i = 0; i < env->Length(); ++i) {
       Value* value = env->ValueAt(i);
       Definition* def = value->definition();
       if (def->HasPairRepresentation()) {
         locations[i] = Location::Pair(Location::Any(), Location::Any());
       } else {
         locations[i] = Location::Any();
       }
 
@@ skipping 52 matching lines @@
     const intptr_t block_start_pos,
     const intptr_t use_pos,
     MaterializeObjectInstr* mat) {
   // Materialization can occur several times in the same environment.
   // Check if we already processed this one.
   if (mat->locations() != NULL) {
     return;  // Already processed.
   }
 
   // Initialize location for every input of the MaterializeObject instruction.
-  Location* locations =
-      Isolate::Current()->current_zone()->Alloc<Location>(mat->InputCount());
+  Location* locations = flow_graph_.zone()->Alloc<Location>(mat->InputCount());
   mat->set_locations(locations);
 
   for (intptr_t i = 0; i < mat->InputCount(); ++i) {
     Definition* def = mat->InputAt(i)->definition();
 
     ConstantInstr* constant = def->AsConstant();
     if (constant != NULL) {
       locations[i] = Location::Constant(constant);
       continue;
     }
@@ skipping 1047 matching lines @@
         allocated_head);
     if (pos < intersection) intersection = pos;
   }
   return intersection;
 }
 
 
 void ReachingDefs::AddPhi(PhiInstr* phi) {
   // TODO(johnmccutchan): Fix handling of PhiInstr with PairLocation.
   if (phi->reaching_defs() == NULL) {
-    Isolate* isolate = Isolate::Current();
-    phi->set_reaching_defs(new(isolate) BitVector(
-        isolate, flow_graph_.max_virtual_register_number()));
+    Zone* zone = flow_graph_.zone();
+    phi->set_reaching_defs(new(zone) BitVector(
+        zone, flow_graph_.max_virtual_register_number()));
 
     // Compute initial set reaching defs set.
     bool depends_on_phi = false;
     for (intptr_t i = 0; i < phi->InputCount(); i++) {
       Definition* input = phi->InputAt(i)->definition();
       if (input->IsPhi()) {
         depends_on_phi = true;
       }
       phi->reaching_defs()->Add(input->ssa_temp_index());
     }
@@ skipping 931 matching lines @@
     OS::Print("-- [after ssa allocator] ir [%s] -------------\n",
               function.ToFullyQualifiedCString());
     FlowGraphPrinter printer(flow_graph_, true);
     printer.PrintBlocks();
     OS::Print("----------------------------------------------\n");
   }
 }
 
 
 }  // namespace dart