Use Object::null_object() instead of Object::ZoneHandle() when a null object

runtime/vm/flow_graph_compiler_mips.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/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 573 matching lines @@
 
   // test_cache is null if there is no fall-through.
   Label done;
   if (!test_cache.IsNull()) {
     // Generate runtime call.
     // Load instantiator (A2) and its type arguments (A1).
     __ lw(A1, Address(SP, 0 * kWordSize));
     __ lw(A2, Address(SP, 1 * kWordSize));
 
     __ addiu(SP, SP, Immediate(-6 * kWordSize));
-    __ LoadObject(TMP, Object::ZoneHandle());
+    __ LoadObject(TMP, Object::null_object());
     __ sw(TMP, Address(SP, 5 * kWordSize));  // Make room for the result.
     __ sw(A0, Address(SP, 4 * kWordSize));  // Push the instance.
     __ LoadObject(TMP, type);
     __ sw(TMP, Address(SP, 3 * kWordSize));  // Push the type.
     __ sw(A2, Address(SP, 2 * kWordSize));  // Push instantiator.
     __ sw(A1, Address(SP, 1 * kWordSize));  // Push type arguments.
     __ LoadObject(A0, test_cache);
     __ sw(A0, Address(SP, 0 * kWordSize));
     GenerateRuntimeCall(token_pos, deopt_id, kInstanceofRuntimeEntry, 5, locs);
     // Pop the parameters supplied to the runtime entry. The result of the
@@ skipping 52 matching lines @@
 
   // A null object is always assignable and is returned as result.
   Label is_assignable, runtime_call;
 
   __ BranchEqual(A0, reinterpret_cast<int32_t>(Object::null()), &is_assignable);
   __ delay_slot()->sw(A1, Address(SP, 0 * kWordSize));
 
   // Generate throw new TypeError() if the type is malformed or malbounded.
   if (dst_type.IsMalformedOrMalbounded()) {
     __ addiu(SP, SP, Immediate(-4 * kWordSize));
-    __ LoadObject(TMP, Object::ZoneHandle());
+    __ LoadObject(TMP, Object::null_object());
     __ sw(TMP, Address(SP, 3 * kWordSize));  // Make room for the result.
     __ sw(A0, Address(SP, 2 * kWordSize));  // Push the source object.
     __ LoadObject(TMP, dst_name);
     __ sw(TMP, Address(SP, 1 * kWordSize));  // Push the destination name.
     __ LoadObject(TMP, dst_type);
     __ sw(TMP, Address(SP, 0 * kWordSize));  // Push the destination type.
 
     GenerateRuntimeCall(token_pos,
                         deopt_id,
                         kBadTypeErrorRuntimeEntry,
@@ skipping 14 matching lines @@
   SubtypeTestCache& test_cache = SubtypeTestCache::ZoneHandle();
   test_cache = GenerateInlineInstanceof(token_pos, dst_type,
                                         &is_assignable, &runtime_call);
 
   __ Bind(&runtime_call);
   // Load instantiator (A2) and its type arguments (A1).
   __ lw(A1, Address(SP, 0 * kWordSize));
   __ lw(A2, Address(SP, 1 * kWordSize));
 
   __ addiu(SP, SP, Immediate(-7 * kWordSize));
-  __ LoadObject(TMP, Object::ZoneHandle());
+  __ LoadObject(TMP, Object::null_object());
   __ sw(TMP, Address(SP, 6 * kWordSize));  // Make room for the result.
   __ sw(A0, Address(SP, 5 * kWordSize));  // Push the source object.
   __ LoadObject(TMP, dst_type);
   __ sw(TMP, Address(SP, 4 * kWordSize));  // Push the type of the destination.
   __ sw(A2, Address(SP, 3 * kWordSize));  // Push instantiator.
   __ sw(A1, Address(SP, 2 * kWordSize));  // Push type arguments.
   __ LoadObject(TMP, dst_name);
   __ sw(TMP, Address(SP, 1 * kWordSize));  // Push the name of the destination.
   __ LoadObject(T0, test_cache);
   __ sw(T0, Address(SP, 0 * kWordSize));
@@ skipping 1094 matching lines @@
   __ AddImmediate(SP, kDoubleSize);
 }
 
 
 #undef __
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS