New bigint implementation in the vm.

runtime/vm/raw_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 VM_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
@@ skipping 1395 matching lines @@
   int64_t value_;
 
   friend class Api;
   friend class SnapshotReader;
 };
 
 
 class RawBigint : public RawInteger {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Bigint);
 
-  // Actual length in chunks at the time of allocation (later we may
-  // clamp the operational length but we need to maintain a consistent
-  // object length so that the object can be traversed during GC).
-  intptr_t allocated_length_;
-
-  // Operational length in chunks of the bigint object, clamping can
-  // cause this length to be reduced. If the signed_length_ is
-  // negative then the number is negative.
-  intptr_t signed_length_;
-
-  // A sequence of Chunks (typedef in Bignum) representing bignum digits.
-  // Bignum::Chunk chunks_[Utils::Abs(signed_length_)];
-  uint8_t* data() { OPEN_ARRAY_START(uint8_t, uint8_t); }
-
-  friend class SnapshotReader;
+  RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->neg_); }
+  RawBool* neg_;
+  RawSmi* used_;
+  RawTypedData* digits_;
+  RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->digits_); }
 };
 
 
 class RawDouble : public RawNumber {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Double);
 
   double value_;
 
   friend class Api;
   friend class SnapshotReader;
@@ skipping 543 matching lines @@
          (index == kTypeArgumentsCid) ||
          (index == kInstructionsCid) ||
          (index == kPcDescriptorsCid) ||
          (index == kStackmapCid) ||
          (index == kLocalVarDescriptorsCid) ||
          (index == kExceptionHandlersCid) ||
          (index == kDeoptInfoCid) ||
          (index == kCodeCid) ||
          (index == kContextScopeCid) ||
          (index == kInstanceCid) ||
-         (index == kBigintCid) ||
          (index == kJSRegExpCid);
 }
 
 
 // This is a set of classes that are not Dart classes whose representation
 // is defined by the VM but are used in the VM code by computing the
 // implicit field offsets of the various fields in the dart object.
 inline bool RawObject::IsImplicitFieldClassId(intptr_t index) {
   return (IsTypedDataViewClassId(index) || index == kByteBufferCid);
 }
 
 
 inline intptr_t RawObject::NumberOfTypedDataClasses() {
   // Make sure this is updated when new TypedData types are added.
   COMPILE_ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_