Make Bigint instances immutable by removing all setters.

runtime/lib/integers.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/bootstrap_natives.h"
 
 #include "include/dart_api.h"
 #include "vm/dart_entry.h"
 #include "vm/dart_api_impl.h"
 #include "vm/exceptions.h"
@@ skipping 391 matching lines @@
 
 
 // Bigint natives.
 
 DEFINE_NATIVE_ENTRY(Bigint_getNeg, 1) {
   const Bigint& bigint = Bigint::CheckedHandle(arguments->NativeArgAt(0));
   return bigint.neg();
 }
 
 
-DEFINE_NATIVE_ENTRY(Bigint_setNeg, 2) {
-  const Bigint& bigint = Bigint::CheckedHandle(arguments->NativeArgAt(0));
-  const Bool& neg = Bool::CheckedHandle(arguments->NativeArgAt(1));
-  bigint.set_neg(neg);
-  return Object::null();
-}
-
-
 DEFINE_NATIVE_ENTRY(Bigint_getUsed, 1) {
   const Bigint& bigint = Bigint::CheckedHandle(arguments->NativeArgAt(0));
   return bigint.used();
 }
 
 
-DEFINE_NATIVE_ENTRY(Bigint_setUsed, 2) {
-  const Bigint& bigint = Bigint::CheckedHandle(arguments->NativeArgAt(0));
-  const Smi& used = Smi::CheckedHandle(arguments->NativeArgAt(1));
-  bigint.set_used(used);
-  return Object::null();
-}
-
-
 DEFINE_NATIVE_ENTRY(Bigint_getDigits, 1) {
   const Bigint& bigint = Bigint::CheckedHandle(arguments->NativeArgAt(0));
   return bigint.digits();
 }
 
 
-DEFINE_NATIVE_ENTRY(Bigint_setDigits, 2) {
-  const Bigint& bigint = Bigint::CheckedHandle(arguments->NativeArgAt(0));
-  const TypedData& digits = TypedData::CheckedHandle(arguments->NativeArgAt(1));
+DEFINE_NATIVE_ENTRY(Bigint_allocate, 4) {
+  // First arg is null type arguments, since class Bigint is not parameterized.
+  const Bool& neg = Bool::CheckedHandle(arguments->NativeArgAt(1));
+  const Smi& used = Smi::CheckedHandle(arguments->NativeArgAt(2));
+  const TypedData& digits = TypedData::CheckedHandle(arguments->NativeArgAt(3));
   ASSERT(!digits.IsNull());
-  bigint.set_digits(digits);
-  return Object::null();
-}
-
-
-DEFINE_NATIVE_ENTRY(Bigint_allocate, 1) {
-  // Argument is null type arguments, since class Bigint is not parameterized.
-  return Bigint::New();
+  return Bigint::New(neg.value(), used.Value(), digits);
 }
 
 }  // namespace dart