srdjan@google.com
7b61cef42b
Review URL: http://codereview.chromium.org//8827015 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@2345 260f80e4-7a28-3924-810f-c04153c831b5
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Class for handling inline cache stubs
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// The caller of an instance function passes the IC-data array in a specific
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// register (ECX on ia32).
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// That array contains information relevant for the call site: function name and
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// inline cache data. Class ICData is a wrapper around that array.
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// The array format is:
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// 0: function-name
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// 1: N, number of arguments checked.
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// 2 .. (length - 1): group of checks, each check containing:
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// - N classes.
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// - 1 target function.
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// Whenever first N arguments of an instance call have the same class as the
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// check, jump to the target function.
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// Array is null terminated (all classes and target are null objects).
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// The array may contain Null-Classes. Null objects cannot be added.
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#ifndef VM_IC_DATA_H_
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#define VM_IC_DATA_H_
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#include "vm/allocation.h"
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#include "vm/growable_array.h"
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namespace dart {
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class Array;
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class Class;
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class Function;
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class String;
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class RawArray;
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class RawString;
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class ICData : public ValueObject {
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public:
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// Wrap IC data around 'array'.
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explicit ICData(const Array& array);
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// Create a new array with zero checks.
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ICData(const String& function_name, intptr_t num_args_checked);
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void set_data(const Array& data);
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RawArray* data() const;
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RawString* FunctionName() const;
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intptr_t NumberOfArgumentsChecked() const;
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intptr_t NumberOfChecks() const;
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// Also updates the instance call at 'return_address_'.
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void AddCheck(const GrowableArray<const Class*>& classes,
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const Function& target);
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void SetCheckAt(intptr_t index,
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const GrowableArray<const Class*>& classes,
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const Function& target);
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void GetOneClassCheckAt(intptr_t index, Class* cls, Function* target) const;
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void GetCheckAt(intptr_t index,
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GrowableArray<const Class*>* classes,
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Function* target) const;
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static const int kNameIndex = 0;
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static const int kNumArgsCheckedIndex = 1;
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static const int kChecksStartIndex = 2;
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private:
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intptr_t ArrayElementsPerCheck() const;
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const Array* data_;
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DISALLOW_COPY_AND_ASSIGN(ICData);
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};
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} // namespace dart
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#endif // VM_IC_DATA_H_
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