- Make Boolean 'true' and 'false' singleton VM isolate objects.

vm/flow_graph_compiler.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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
@@ skipping 132 matching lines @@
       exception_handlers_list_(NULL),
       pc_descriptors_list_(NULL),
       stackmap_table_builder_(
           is_optimizing ? new StackmapTableBuilder() : NULL),
       block_info_(block_order_.length()),
       deopt_infos_(),
       static_calls_target_table_(GrowableObjectArray::ZoneHandle(
           GrowableObjectArray::New())),
       is_optimizing_(is_optimizing),
       may_reoptimize_(false),
-      bool_true_(Bool::ZoneHandle(Bool::True())),
-      bool_false_(Bool::ZoneHandle(Bool::False())),
       double_class_(Class::ZoneHandle(
           Isolate::Current()->object_store()->double_class())),
       parallel_move_resolver_(this) {
   ASSERT(assembler != NULL);
 }
 
 
 FlowGraphCompiler::~FlowGraphCompiler() {
   // BlockInfos are zone-allocated, so their destructors are not called.
   // Verify the labels explicitly here.
@@ skipping 557 matching lines @@
 
 void FlowGraphCompiler::EmitDoubleCompareBool(Condition true_condition,
                                               XmmRegister left,
                                               XmmRegister right,
                                               Register result) {
   assembler()->comisd(left, right);
   Label is_false, is_true, done;
   assembler()->j(PARITY_EVEN, &is_false, Assembler::kNearJump);  // NaN false;
   assembler()->j(true_condition, &is_true, Assembler::kNearJump);
   assembler()->Bind(&is_false);
-  assembler()->LoadObject(result, bool_false());
+  assembler()->LoadObject(result, Bool::False());
   assembler()->jmp(&done);
   assembler()->Bind(&is_true);
-  assembler()->LoadObject(result, bool_true());
+  assembler()->LoadObject(result, Bool::True());
   assembler()->Bind(&done);
 }
 
 
 // Allocate a register that is not explicitly blocked.
 static Register AllocateFreeRegister(bool* blocked_registers) {
   for (intptr_t regno = 0; regno < kNumberOfCpuRegisters; regno++) {
     if (!blocked_registers[regno]) {
       blocked_registers[regno] = true;
       return static_cast<Register>(regno);
@@ skipping 328 matching lines @@
     const AbstractTypeArguments& type_arguments =
         AbstractTypeArguments::Handle(type.arguments());
     const bool is_raw_type = type_arguments.IsNull() ||
         type_arguments.IsRaw(type_arguments.Length());
     return is_raw_type;
   }
   return true;
 }
 
 }  // namespace dart