Ensures that Bigints returned to Dart are all checked by Integer::AsValidInteger.

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 "vm/bigint_operations.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
@@ skipping 286 matching lines @@
 DEFINE_NATIVE_ENTRY(Smi_bitNegate, 1) {
   const Smi& operand = Smi::CheckedHandle(arguments->NativeArgAt(0));
   if (FLAG_trace_intrinsified_natives) {
     OS::Print("Smi_bitNegate: %s\n", operand.ToCString());
   }
   intptr_t result = ~operand.Value();
   ASSERT(Smi::IsValid(result));
   return Smi::New(result);
 }
 
+
 // Mint natives.
 
 DEFINE_NATIVE_ENTRY(Mint_bitNegate, 1) {
   const Mint& operand = Mint::CheckedHandle(arguments->NativeArgAt(0));
   ASSERT(CheckInteger(operand));
   if (FLAG_trace_intrinsified_natives) {
     OS::Print("Mint_bitNegate: %s\n", operand.ToCString());
   }
   int64_t result = ~operand.value();
   return Integer::New(result);
 }
 
+
 // Bigint natives.
 
 DEFINE_NATIVE_ENTRY(Bigint_bitNegate, 1) {
   const Bigint& value = Bigint::CheckedHandle(arguments->NativeArgAt(0));
   const Bigint& result = Bigint::Handle(BigintOperations::BitNot(value));
   ASSERT(CheckInteger(value));
   ASSERT(CheckInteger(result));
   return result.AsValidInteger();
 }
 
 }  // namespace dart