sgjesse@google.com
bf67f24098
The purpose of this change is twofold: 1. Source in the bin directory can now use the same assertions as source in the vm directory. The ASSERT macro used by the code in runtime/bin was just defined to use assert from the standard C library. 2. Moving other implementation parts from runtime/vm to runtime/platform (e.g. classes Monitor and Mutex) for sharing between runtime/bin and runtime/vm will be easier as these implementations rely on these assertion macros. Created two gypi files for the platform directory. One for the headers and one for the source. The source one is only included when building the VM library and will be present in libdart.a when the dart executable is linked. All the code for asserts is still in the dart namespace. Also re-arranged the order of includes to be alphabetically in the files touched. R=ager@google.com, iposva@google.com BUG= TEST= Review URL: http://codereview.chromium.org//9189003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3335 260f80e4-7a28-3924-810f-c04153c831b5
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
// Copyright (c) 2012, 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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#ifndef VM_BOOLFIELD_H_
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#define VM_BOOLFIELD_H_
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#include "vm/globals.h"
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namespace dart {
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// BoolField is a template for encoding and decoding a bit inside an
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// unsigned machine word.
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template<int position>
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class BoolField {
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public:
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// Returns a uword with the bool value encoded.
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static uword encode(bool value) {
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ASSERT(position < sizeof(uword));
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return static_cast<uword>((value ? 1U : 0) << position);
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}
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// Extracts the bool from the value.
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static bool decode(uword value) {
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ASSERT(position < sizeof(uword));
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return (value & (1U << position)) != 0;
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}
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// Returns a uword with the bool field value encoded based on the
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// original value. Only the single bit corresponding to this bool
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// field will be changed.
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static uword update(bool value, uword original) {
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ASSERT(position < sizeof(uword));
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const uword mask = 1U << position;
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return value ? original | mask : original & ~mask;
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}
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};
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} // namespace dart
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#endif // VM_BOOLFIELD_H_
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