First part of new ICData infrastructure: use a wrapper object instead of an array.

runtime/vm/ic_data.h

-// Copyright (c) 2011, 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.
-// Class for handling inline cache stubs
-
-// The caller of an instance function passes the IC-data array in a specific
-// register (ECX on ia32).
-// That array contains information relevant for the call site: function name and
-// inline cache data. Class ICData is a wrapper around that array.
-// The array format is:
-// 0: function-name
-// 1: N, number of arguments checked.
-// 2 .. (length - 1): group of checks, each check containing:
-//   - N classes.
-//   - 1 target function.
-// Whenever first N arguments of an instance call have the same class as the
-// check, jump to the target function.
-// Array is null terminated (all classes and target are null objects).
-// The array may contain Null-Classes. Null objects cannot be added.
-
-#ifndef VM_IC_DATA_H_
-#define VM_IC_DATA_H_
-
-#include "vm/allocation.h"
-#include "vm/growable_array.h"
-
-namespace dart {
-
-class Array;
-class Class;
-class Function;
-class String;
-class RawArray;
-class RawString;
-
-class ICData : public ValueObject {
- public:
-  // Wrap IC data around 'array'.
-  explicit ICData(const Array& array);
-
-  // Create a new array with zero checks.
-  ICData(const String& function_name, intptr_t num_args_checked);
-
-  void set_data(const Array& data);
-  RawArray* data() const;
-
-  RawString* FunctionName() const;
-
-  intptr_t NumberOfArgumentsChecked() const;
-  intptr_t NumberOfChecks() const;
-
-  // Also updates the instance call at 'return_address_'.
-  void AddCheck(const GrowableArray<const Class*>& classes,
-                const Function& target);
-
-  void SetCheckAt(intptr_t index,
-                  const GrowableArray<const Class*>& classes,
-                  const Function& target);
-
-  void GetOneClassCheckAt(intptr_t index, Class* cls, Function* target) const;
-
-  void GetCheckAt(intptr_t index,
-                  GrowableArray<const Class*>* classes,
-                  Function* target) const;
-
-  static const int kNameIndex = 0;
-  static const int kNumArgsCheckedIndex = 1;
-  static const int kChecksStartIndex = 2;
-
- private:
-  intptr_t ArrayElementsPerCheck() const;
-
-  const Array* data_;
-
-
-  DISALLOW_COPY_AND_ASSIGN(ICData);
-};
-
-}  // namespace dart
-
-#endif  // VM_IC_DATA_H_