Option to truncate integers to 64 bits, part 2

runtime/vm/object.h

 // 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.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 6341 matching lines @@
   friend class Class;
 };
 
 class Integer : public Number {
  public:
   static RawInteger* New(const String& str, Heap::Space space = Heap::kNew);
   static RawInteger* NewFromUint64(uint64_t value,
                                    Heap::Space space = Heap::kNew);
 
   // Returns a canonical Integer object allocated in the old gen space.
+  // Returns null if integer is out of range (in --limit-ints-to-64-bits mode).
   static RawInteger* NewCanonical(const String& str);
 
   static RawInteger* New(int64_t value, Heap::Space space = Heap::kNew);
 
   virtual bool OperatorEquals(const Instance& other) const {
     return Equals(other);
   }
   virtual bool CanonicalizeEquals(const Instance& other) const {
     return Equals(other);
   }
@@ skipping 225 matching lines @@
   static RawBigint* NewFromShiftedInt64(int64_t value,
                                         intptr_t shift,
                                         Heap::Space space = Heap::kNew);
 
   static RawBigint* NewFromCString(const char* str,
                                    Heap::Space space = Heap::kNew);
 
   // Returns a canonical Bigint object allocated in the old gen space.
   static RawBigint* NewCanonical(const String& str);
 
+  // Returns true if Bigint can't be instantiated.
+  static bool IsDisabled() { return FLAG_limit_ints_to_64_bits; }
+
  private:
   void SetNeg(bool value) const;
   void SetUsed(intptr_t value) const;
   void set_digits(const TypedData& value) const;
 
   // Convenience helpers.
   static RawTypedData* NewDigits(intptr_t length,
                                  Heap::Space space = Heap::kNew);
   static uint32_t DigitAt(const TypedData& digits, intptr_t index);
   static void SetDigitAt(const TypedData& digits,
@@ skipping 2292 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_