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Issue 6992025: WIP: Blocks for global handles. Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 9 years, 7 months ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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197 return static_cast<int>(length); 197 return static_cast<int>(length);
198 } 198 }
199 199
200 200
201 // ---------------------------------------------------------------------------- 201 // ----------------------------------------------------------------------------
202 // BitField is a help template for encoding and decode bitfield with 202 // BitField is a help template for encoding and decode bitfield with
203 // unsigned content. 203 // unsigned content.
204 template<class T, int shift, int size> 204 template<class T, int shift, int size>
205 class BitField { 205 class BitField {
206 public: 206 public:
207 typedef T ValueType;
208
207 // Tells whether the provided value fits into the bit field. 209 // Tells whether the provided value fits into the bit field.
208 static bool is_valid(T value) { 210 static bool is_valid(T value) {
209 return (static_cast<uint32_t>(value) & ~((1U << (size)) - 1)) == 0; 211 return (static_cast<uint32_t>(value) & ~((1U << (size)) - 1)) == 0;
210 } 212 }
211 213
212 // Returns a uint32_t mask of bit field. 214 // Returns a uint32_t mask of bit field.
213 static uint32_t mask() { 215 static uint32_t mask() {
214 // To use all bits of a uint32 in a bitfield without compiler warnings we 216 // To use all bits of a uint32 in a bitfield without compiler warnings we
215 // have to compute 2^32 without using a shift count of 32. 217 // have to compute 2^32 without using a shift count of 32.
216 return ((1U << shift) << size) - (1U << shift); 218 return ((1U << shift) << size) - (1U << shift);
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791 INLINE(Dest BitCast(const Source& source)); 793 INLINE(Dest BitCast(const Source& source));
792 794
793 template <class Dest, class Source> 795 template <class Dest, class Source>
794 inline Dest BitCast(const Source& source) { 796 inline Dest BitCast(const Source& source) {
795 return BitCastHelper<Dest, Source>::cast(source); 797 return BitCastHelper<Dest, Source>::cast(source);
796 } 798 }
797 799
798 } } // namespace v8::internal 800 } } // namespace v8::internal
799 801
800 #endif // V8_UTILS_H_ 802 #endif // V8_UTILS_H_
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