Migrate most uses of Isolate::current_zone to Thread::zone.

runtime/vm/snapshot.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/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
@@ skipping 2057 matching lines @@
     const Class& clazz = Class::Handle(isolate(), cls);
     const Function& errorFunc = Function::Handle(isolate(), func);
     ASSERT(!errorFunc.IsNull());
 
     // All other closures are errors.
     const char* format = "Illegal argument in isolate message"
         " : (object is a closure - %s %s)";
     UnmarkAll();  // Unmark objects now as we are about to print stuff.
     intptr_t len = OS::SNPrint(NULL, 0, format,
                                clazz.ToCString(), errorFunc.ToCString()) + 1;
-    char* chars = isolate()->current_zone()->Alloc<char>(len);
+    char* chars = Thread::Current()->zone()->Alloc<char>(len);
     OS::SNPrint(chars, len, format, clazz.ToCString(), errorFunc.ToCString());
     SetWriteException(Exceptions::kArgument, chars);
   }
   return Function::null();
 }
 
 
 RawClass* SnapshotWriter::GetFunctionOwner(RawFunction* func) {
   RawObject* owner = func->ptr()->owner_;
   uword tags = GetObjectTags(owner);
   intptr_t class_id = RawObject::ClassIdTag::decode(tags);
   if (class_id == kClassCid) {
     return reinterpret_cast<RawClass*>(owner);
   }
   ASSERT(class_id == kPatchClassCid);
   return reinterpret_cast<RawPatchClass*>(owner)->ptr()->patched_class_;
 }
 
 
 void SnapshotWriter::CheckForNativeFields(RawClass* cls) {
   if (cls->ptr()->num_native_fields_ != 0) {
     // We do not allow objects with native fields in an isolate message.
     HANDLESCOPE(isolate());
     const char* format = "Illegal argument in isolate message"
                          " : (object extends NativeWrapper - %s)";
     UnmarkAll();  // Unmark objects now as we are about to print stuff.
     const Class& clazz = Class::Handle(isolate(), cls);
     intptr_t len = OS::SNPrint(NULL, 0, format, clazz.ToCString()) + 1;
-    char* chars = isolate()->current_zone()->Alloc<char>(len);
+    char* chars = Thread::Current()->zone()->Alloc<char>(len);
     OS::SNPrint(chars, len, format, clazz.ToCString());
     SetWriteException(Exceptions::kArgument, chars);
   }
 }
 
 
 void SnapshotWriter::SetWriteException(Exceptions::ExceptionType type,
                                        const char* msg) {
   set_exception_type(type);
   set_exception_msg(msg);
@@ skipping 223 matching lines @@
     NoSafepointScope no_safepoint;
     WriteObject(obj.raw());
     UnmarkAll();
   } else {
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart