115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the JavaScript 2 Prototype.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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#ifndef utilities_h___
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#define utilities_h___
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#include "systemtypes.h"
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namespace JavaScript
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{
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#ifndef _WIN32
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#define STATIC_CONST(type, expr) static const type expr
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#else
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// Microsoft Visual C++ 6.0 bug: constants not supported
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#define STATIC_CONST(type, expr) enum {expr}
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#endif
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//
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// Assertions
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//
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#ifdef DEBUG
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void Assert(const char *s, const char *file, int line);
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#define ASSERT(_expr) ((_expr) ? (void)0 : JavaScript::Assert(#_expr, __FILE__, __LINE__))
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#define NOT_REACHED(_reasonStr) JavaScript::Assert(_reasonStr, __FILE__, __LINE__)
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#define DEBUG_ONLY(_stmt) _stmt
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#else
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#define ASSERT(expr) (void)0
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#define NOT_REACHED(reasonStr) (void)0
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#define DEBUG_ONLY(_stmt)
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#endif
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// A checked_cast acts as a static_cast that is checked in DEBUG mode.
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// It can only be used to downcast a class hierarchy that has at least one virtual function.
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#ifdef DEBUG
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template <class Target, class Source> inline Target checked_cast(Source *s)
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{
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Target t = dynamic_cast<Target>(s);
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ASSERT(t);
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return t;
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}
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#else
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#define checked_cast static_cast
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#endif
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//
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// Mathematics
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//
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template<class N> inline N v_min(N v1, N v2) {return v1 <= v2 ? v1 : v2;}
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template<class N> inline N v_max(N v1, N v2) {return v1 >= v2 ? v1 : v2;}
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uint ceilingLog2(uint32 n);
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uint floorLog2(uint32 n);
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//
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// Flag Bitmaps
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//
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template<class F> inline F setFlag(F flags, F flag) {return static_cast<F>(flags | flag);}
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template<class F> inline F clearFlag(F flags, F flag) {return static_cast<F>(flags & ~flag);}
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template<class F> inline bool testFlag(F flags, F flag) {return (flags & flag) != 0;}
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//
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// Signed/Unsigned Conversions
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//
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// Use these instead of type casts to safely convert between signed and unsigned
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// integers of the same size.
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inline uint32 toUInt32(int32 x) {return static_cast<uint32>(x);}
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inline int32 toInt32(uint32 x) {return static_cast<int32>(x);}
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inline size_t toSize_t(ptrdiff_t x) {return static_cast<size_t>(x);}
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inline ptrdiff_t toPtrdiff_t(size_t x) {return static_cast<ptrdiff_t>(x);}
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}
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#endif /* utilities_h___ */
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