The Tor Browser: js/src/jsutil.h@a63d609f5ebe (annotated)

js/src/jsutil.h@a63d609f5ebe (annotated)

js/src/jsutil.h

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * PR assertion checker.
  */
 #ifndef jsutil_h
 #define jsutil_h
 #include "mozilla/Assertions.h"
 #include "mozilla/Compiler.h"
 #include "mozilla/GuardObjects.h"
 #include <limits.h>
 #include "js/Utility.h"
 #define JS_ALWAYS_TRUE(expr)      MOZ_ALWAYS_TRUE(expr)
 #define JS_ALWAYS_FALSE(expr)     MOZ_ALWAYS_FALSE(expr)
 #if defined(JS_DEBUG)
 # define JS_DIAGNOSTICS_ASSERT(expr) MOZ_ASSERT(expr)
 #elif defined(JS_CRASH_DIAGNOSTICS)
 # define JS_DIAGNOSTICS_ASSERT(expr) do { if (MOZ_UNLIKELY(!(expr))) MOZ_CRASH(); } while(0)
 #else
 # define JS_DIAGNOSTICS_ASSERT(expr) ((void) 0)
 #endif
 static MOZ_ALWAYS_INLINE void *
 js_memcpy(void *dst_, const void *src_, size_t len)
 {
     char *dst = (char *) dst_;
     const char *src = (const char *) src_;
     JS_ASSERT_IF(dst >= src, (size_t) (dst - src) >= len);
     JS_ASSERT_IF(src >= dst, (size_t) (src - dst) >= len);
     return memcpy(dst, src, len);
 }
 namespace js {
 template <class T>
 struct AlignmentTestStruct
 {
     char c;
     T t;
 };
 /* This macro determines the alignment requirements of a type. */
 #define JS_ALIGNMENT_OF(t_) \
   (sizeof(js::AlignmentTestStruct<t_>) - sizeof(t_))
 template <class T>
 class AlignedPtrAndFlag
 {
     uintptr_t bits;
   public:
     AlignedPtrAndFlag(T *t, bool aFlag) {
         JS_ASSERT((uintptr_t(t) & 1) == 0);
         bits = uintptr_t(t) | uintptr_t(aFlag);
     }
     T *ptr() const {
         return (T *)(bits & ~uintptr_t(1));
     }
     bool flag() const {
         return (bits & 1) != 0;
     }
     void setPtr(T *t) {
         JS_ASSERT((uintptr_t(t) & 1) == 0);
         bits = uintptr_t(t) | uintptr_t(flag());
     }
     void setFlag() {
         bits |= 1;
     }
     void unsetFlag() {
         bits &= ~uintptr_t(1);
     }
     void set(T *t, bool aFlag) {
         JS_ASSERT((uintptr_t(t) & 1) == 0);
         bits = uintptr_t(t) | aFlag;
     }
 };
 template <class T>
 static inline void
 Reverse(T *beg, T *end)
 {
     while (beg != end) {
         if (--end == beg)
             return;
         T tmp = *beg;
         *beg = *end;
         *end = tmp;
         ++beg;
     }
 }
 template <class T>
 static inline T *
 Find(T *beg, T *end, const T &v)
 {
     for (T *p = beg; p != end; ++p) {
         if (*p == v)
             return p;
     }
     return end;
 }
 template <class Container>
 static inline typename Container::ElementType *
 Find(Container &c, const typename Container::ElementType &v)
 {
     return Find(c.begin(), c.end(), v);
 }
 template <typename InputIterT, typename CallableT>
 void
 ForEach(InputIterT begin, InputIterT end, CallableT f)
 {
     for (; begin != end; ++begin)
         f(*begin);
 }
 template <class T>
 static inline T
 Min(T t1, T t2)
 {
     return t1 < t2 ? t1 : t2;
 }
 template <class T>
 static inline T
 Max(T t1, T t2)
 {
     return t1 > t2 ? t1 : t2;
 }
 /* Allows a const variable to be initialized after its declaration. */
 template <class T>
 static T&
 InitConst(const T &t)
 {
     return const_cast<T &>(t);
 }
 template <class T, class U>
 MOZ_ALWAYS_INLINE T &
 ImplicitCast(U &u)
 {
     T &t = u;
     return t;
 }
 template<typename T>
 class AutoScopedAssign
 {
   public:
     AutoScopedAssign(T *addr, const T &value
                      MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
         : addr_(addr), old(*addr_)
     {
         MOZ_GUARD_OBJECT_NOTIFIER_INIT;
         *addr_ = value;
     }
     ~AutoScopedAssign() { *addr_ = old; }
   private:
     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
     T *addr_;
     T old;
 };
 template <typename T>
 static inline bool
 IsPowerOfTwo(T t)
 {
     return t && !(t & (t - 1));
 }
 template <typename T, typename U>
 static inline U
 ComputeByteAlignment(T bytes, U alignment)
 {
     JS_ASSERT(IsPowerOfTwo(alignment));
     return (alignment - (bytes % alignment)) % alignment;
 }
 template <typename T, typename U>
 static inline T
 AlignBytes(T bytes, U alignment)
 {
     return bytes + ComputeByteAlignment(bytes, alignment);
 }
 static MOZ_ALWAYS_INLINE size_t
 UnsignedPtrDiff(const void *bigger, const void *smaller)
 {
     return size_t(bigger) - size_t(smaller);
 }
 /*****************************************************************************/
 /* A bit array is an array of bits represented by an array of words (size_t). */
 static const size_t BitArrayElementBits = sizeof(size_t) * CHAR_BIT;
 static inline unsigned
 NumWordsForBitArrayOfLength(size_t length)
 {
     return (length + (BitArrayElementBits - 1)) / BitArrayElementBits;
 }
 static inline unsigned
 BitArrayIndexToWordIndex(size_t length, size_t bitIndex)
 {
     unsigned wordIndex = bitIndex / BitArrayElementBits;
     JS_ASSERT(wordIndex < length);
     return wordIndex;
 }
 static inline size_t
 BitArrayIndexToWordMask(size_t i)
 {
     return size_t(1) << (i % BitArrayElementBits);
 }
 static inline bool
 IsBitArrayElementSet(size_t *array, size_t length, size_t i)
 {
     return array[BitArrayIndexToWordIndex(length, i)] & BitArrayIndexToWordMask(i);
 }
 static inline bool
 IsAnyBitArrayElementSet(size_t *array, size_t length)
 {
     unsigned numWords = NumWordsForBitArrayOfLength(length);
     for (unsigned i = 0; i < numWords; ++i) {
         if (array[i])
             return true;
     }
     return false;
 }
 static inline void
 SetBitArrayElement(size_t *array, size_t length, size_t i)
 {
     array[BitArrayIndexToWordIndex(length, i)] |= BitArrayIndexToWordMask(i);
 }
 static inline void
 ClearBitArrayElement(size_t *array, size_t length, size_t i)
 {
     array[BitArrayIndexToWordIndex(length, i)] &= ~BitArrayIndexToWordMask(i);
 }
 static inline void
 ClearAllBitArrayElements(size_t *array, size_t length)
 {
     for (unsigned i = 0; i < length; ++i)
         array[i] = 0;
 }
 }  /* namespace js */
 /* Crash diagnostics */
 #ifdef DEBUG
 # define JS_CRASH_DIAGNOSTICS 1
 #endif
 #if defined(JS_CRASH_DIAGNOSTICS) || defined(JS_GC_ZEAL)
 # define JS_POISON(p, val, size) memset((p), (val), (size))
 #else
 # define JS_POISON(p, val, size) ((void) 0)
 #endif
 /* Bug 984101: Disable labeled poisoning until we have poison checking. */
 #define JS_EXTRA_POISON(p, val, size) ((void) 0)
 /* Basic stats */
 #ifdef DEBUG
 # define JS_BASIC_STATS 1
 #endif
 #ifdef JS_BASIC_STATS
 # include <stdio.h>
 typedef struct JSBasicStats {
     uint32_t    num;
     uint32_t    max;
     double      sum;
     double      sqsum;
     uint32_t    logscale;           /* logarithmic scale: 0 (linear), 2, 10 */
     uint32_t    hist[11];
 } JSBasicStats;
 # define JS_INIT_STATIC_BASIC_STATS  {0,0,0,0,0,{0,0,0,0,0,0,0,0,0,0,0}}
 # define JS_BASIC_STATS_INIT(bs)     memset((bs), 0, sizeof(JSBasicStats))
 # define JS_BASIC_STATS_ACCUM(bs,val)                                         \
     JS_BasicStatsAccum(bs, val)
 # define JS_MeanAndStdDevBS(bs,sigma)                                         \
     JS_MeanAndStdDev((bs)->num, (bs)->sum, (bs)->sqsum, sigma)
 extern void
 JS_BasicStatsAccum(JSBasicStats *bs, uint32_t val);
 extern double
 JS_MeanAndStdDev(uint32_t num, double sum, double sqsum, double *sigma);
 extern void
 JS_DumpBasicStats(JSBasicStats *bs, const char *title, FILE *fp);
 extern void
 JS_DumpHistogram(JSBasicStats *bs, FILE *fp);
 #else
 # define JS_BASIC_STATS_ACCUM(bs,val)
 #endif
 /* A jsbitmap_t is a long integer that can be used for bitmaps. */
 typedef size_t jsbitmap;
 #define JS_BITMAP_NBITS (sizeof(jsbitmap) * CHAR_BIT)
 #define JS_TEST_BIT(_map,_bit)  ((_map)[(_bit)/JS_BITMAP_NBITS] &             \
                                  (jsbitmap(1)<<((_bit)%JS_BITMAP_NBITS)))
 #define JS_SET_BIT(_map,_bit)   ((_map)[(_bit)/JS_BITMAP_NBITS] |=            \
                                  (jsbitmap(1)<<((_bit)%JS_BITMAP_NBITS)))
 #define JS_CLEAR_BIT(_map,_bit) ((_map)[(_bit)/JS_BITMAP_NBITS] &=            \
                                  ~(jsbitmap(1)<<((_bit)%JS_BITMAP_NBITS)))
 /* Wrapper for various macros to stop warnings coming from their expansions. */
 #if defined(__clang__)
 # define JS_SILENCE_UNUSED_VALUE_IN_EXPR(expr)                                \
     JS_BEGIN_MACRO                                                            \
         _Pragma("clang diagnostic push")                                      \
         /* If these _Pragmas cause warnings for you, try disabling ccache. */ \
         _Pragma("clang diagnostic ignored \"-Wunused-value\"")                \
         { expr; }                                                             \
         _Pragma("clang diagnostic pop")                                       \
     JS_END_MACRO
 #elif MOZ_IS_GCC
 #if MOZ_GCC_VERSION_AT_LEAST(4, 6, 0)
 # define JS_SILENCE_UNUSED_VALUE_IN_EXPR(expr)                                \
     JS_BEGIN_MACRO                                                            \
         _Pragma("GCC diagnostic push")                                        \
         _Pragma("GCC diagnostic ignored \"-Wunused-but-set-variable\"")       \
         expr;                                                                 \
         _Pragma("GCC diagnostic pop")                                         \
     JS_END_MACRO
 #endif
 #endif
 #if !defined(JS_SILENCE_UNUSED_VALUE_IN_EXPR)
 # define JS_SILENCE_UNUSED_VALUE_IN_EXPR(expr)                                \
     JS_BEGIN_MACRO                                                            \
         expr;                                                                 \
     JS_END_MACRO
 #endif
 #endif /* jsutil_h */

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js/src/jsutil.h@a63d609f5ebe (annotated)

js/src/jsutil.h