Fix for running with --throw_on_javascript_int_overflow: recognize pattern (a << b) & mask and test…

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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 4126 matching lines @@
 
 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.
   static RawInteger* NewCanonical(const String& str);
 
-  static RawInteger* New(int64_t value, Heap::Space space = Heap::kNew);
+  // Do not throw JavascriptIntegerOverflow if 'silent' is true.
+  static RawInteger* New(int64_t value,
+                         Heap::Space space = Heap::kNew,
+                         const bool silent = false);
 
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
 
   // Returns 0, -1 or 1.
   virtual int CompareWith(const Integer& other) const;
 
   // Return the most compact presentation of an integer.
   RawInteger* AsValidInteger() const;
 
@@ skipping 54 matching lines @@
   }
 
   static bool IsValid(intptr_t value) {
     return (value >= kMinValue) && (value <= kMaxValue);
   }
 
   static bool IsValid64(int64_t value) {
     return (value >= kMinValue) && (value <= kMaxValue);
   }
 
-  RawInteger* ShiftOp(Token::Kind kind, const Smi& other) const;
+  RawInteger* ShiftOp(Token::Kind kind,
+                      const Smi& other,
+                      const bool silent = false) const;
 
   void operator=(RawSmi* value) {
     raw_ = value;
     CHECK_HANDLE();
   }
   void operator^=(RawObject* value) {
     raw_ = value;
     CHECK_HANDLE();
   }
 
@@ skipping 1816 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_