Add higher-level accesses to Environment. Print flow graph after register allocation. Most interest…

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, 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/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 24 matching lines @@
         __ pushq(registers_[i]);
       }
     }
   } else {
     // We have a deoptimization environment, we have to tear down optimized
     // frame and recreate non-optimized one.
     __ leaq(RSP,
             Address(RBP, ParsedFunction::kFirstLocalSlotIndex * kWordSize));
 
     const GrowableArray<Value*>& values = deoptimization_env_->values();
-    const GrowableArray<Location>* locations = deoptimization_env_->locations();
-
     for (intptr_t i = 0; i < values.length(); i++) {
-      const Location loc = (*locations)[i];
+      const Location loc = deoptimization_env_->LocationAt(i);
       if (loc.IsInvalid()) {
         ASSERT(values[i]->IsConstant());
         __ PushObject(values[i]->AsConstant()->value());
       } else {
         ASSERT(loc.IsRegister());
         __ pushq(loc.reg());
       }
     }
   }
 
@@ skipping 1148 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64