Eliminate 99% of allocated ExceptionHandler objects

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 1120 matching lines @@
     intptr_t handler_pc;       // PC value of handler.
     int16_t outer_try_index;   // Try block index of enclosing try block.
     int8_t needs_stacktrace;   // True if a stacktrace is needed.
     int8_t has_catch_all;      // Catches all exceptions.
   };
 
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(ExceptionHandlers);
 
   // Number of exception handler entries.
-  int32_t length_;
+  int32_t num_entries_;
 
-  // Array with [length_] entries. Each entry is an array of all handled
+  // Array with [num_entries_] entries. Each entry is an array of all handled
   // exception types.
   RawArray* handled_types_data_;
 
-  // Exception handler info of length [length_].
+  // Exception handler info of length [num_entries_].
   HandlerInfo* data() { OPEN_ARRAY_START(HandlerInfo, intptr_t); }
+
+  friend class Object;
 };
 
 
 // Contains an array of deoptimization commands, e.g., move a specific register
 // into a specific slot of unoptimized frame.
 class RawDeoptInfo : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(DeoptInfo);
 
   RawSmi* length_;  // Number of deoptimization commands
 
@@ skipping 893 matching lines @@
   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_