LCOV - code coverage report
Current view: directory - xpcom/glue - nsQuickSort.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 66 54 81.8 %
Date: 2012-06-02 Functions: 3 3 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : 
       3                 : /*-
       4                 :  * Copyright (c) 1992, 1993
       5                 :  *      The Regents of the University of California.  All rights reserved.
       6                 :  *
       7                 :  * Redistribution and use in source and binary forms, with or without
       8                 :  * modification, are permitted provided that the following conditions
       9                 :  * are met:
      10                 :  * 1. Redistributions of source code must retain the above copyright
      11                 :  *    notice, this list of conditions and the following disclaimer.
      12                 :  * 2. Redistributions in binary form must reproduce the above copyright
      13                 :  *    notice, this list of conditions and the following disclaimer in the
      14                 :  *    documentation and/or other materials provided with the distribution.
      15                 :  * 3. Neither the name of the University nor the names of its contributors
      16                 :  *    may be used to endorse or promote products derived from this software
      17                 :  *    without specific prior written permission.
      18                 :  *
      19                 :  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      20                 :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      21                 :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      22                 :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      23                 :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      24                 :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      25                 :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      26                 :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      27                 :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      28                 :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      29                 :  * SUCH DAMAGE.
      30                 :  */
      31                 : 
      32                 : /* We need this because Solaris' version of qsort is broken and
      33                 :  * causes array bounds reads.
      34                 :  */
      35                 : 
      36                 : #include <stdlib.h>
      37                 : #include "prtypes.h"
      38                 : #include "nsAlgorithm.h"
      39                 : #include "nsQuickSort.h"
      40                 : 
      41                 : PR_BEGIN_EXTERN_C
      42                 : 
      43                 : #if !defined(DEBUG) && (defined(__cplusplus) || defined(__gcc))
      44                 : # ifndef INLINE
      45                 : #  define INLINE inline
      46                 : # endif
      47                 : #else
      48                 : # define INLINE
      49                 : #endif
      50                 : 
      51                 : typedef int              cmp_t(const void *, const void *, void *);
      52                 : static INLINE char      *med3(char *, char *, char *, cmp_t *, void *);
      53                 : static INLINE void      swapfunc(char *, char *, int, int);
      54                 : 
      55                 : /*
      56                 :  * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
      57                 :  */
      58                 : #define swapcode(TYPE, parmi, parmj, n) {               \
      59                 :         long i = (n) / sizeof (TYPE);                   \
      60                 :         register TYPE *pi = (TYPE *) (parmi);           \
      61                 :         register TYPE *pj = (TYPE *) (parmj);           \
      62                 :         do {                                            \
      63                 :                 register TYPE   t = *pi;                \
      64                 :                 *pi++ = *pj;                            \
      65                 :                 *pj++ = t;                              \
      66                 :         } while (--i > 0);                           \
      67                 : }
      68                 : 
      69                 : #define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
      70                 :         es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
      71                 : 
      72                 : static INLINE void
      73              70 : swapfunc(char *a, char *b, int n, int swaptype)
      74                 : {
      75              70 :         if(swaptype <= 1)
      76              59 :                 swapcode(long, a, b, n)
      77                 :         else
      78              11 :                 swapcode(char, a, b, n)
      79              70 : }
      80                 : 
      81                 : #define swap(a, b)                                      \
      82                 :         if (swaptype == 0) {                            \
      83                 :                 long t = *(long *)(a);                  \
      84                 :                 *(long *)(a) = *(long *)(b);            \
      85                 :                 *(long *)(b) = t;                       \
      86                 :         } else                                          \
      87                 :                 swapfunc((char *)a, (char*)b, (int)es, swaptype)
      88                 : 
      89                 : #define vecswap(a, b, n)        if ((n) > 0) swapfunc((char *)a, (char *)b, (int)n, swaptype)
      90                 : 
      91                 : static INLINE char *
      92               8 : med3(char *a, char *b, char *c, cmp_t* cmp, void *data)
      93                 : {
      94               8 :         return cmp(a, b, data) < 0 ?
      95               6 :                (cmp(b, c, data) < 0 ? b : (cmp(a, c, data) < 0 ? c : a ))
      96              14 :               :(cmp(b, c, data) > 0 ? b : (cmp(a, c, data) < 0 ? a : c ));
      97                 : }
      98                 : 
      99              25 : void NS_QuickSort (
     100                 :         void *a,
     101                 :         unsigned int n,
     102                 :     unsigned int es,
     103                 :         cmp_t *cmp,
     104                 :         void *data
     105                 :     )
     106                 : {
     107                 :         char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
     108                 :         int d, r, swaptype, swap_cnt;
     109                 : 
     110              25 : loop:   SWAPINIT(a, es);
     111              25 :         swap_cnt = 0;
     112              25 :         if (n < 7) {
     113              57 :                 for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
     114              89 :                         for (pl = pm; pl > (char *)a && cmp(pl - es, pl, data) > 0;
     115              47 :                              pl -= es)
     116              47 :                                 swap(pl, pl - es);
     117              15 :                 return;
     118                 :         }
     119              10 :         pm = (char *)a + (n / 2) * es;
     120              10 :         if (n > 7) {
     121               8 :                 pl = (char *)a;
     122               8 :                 pn = (char *)a + (n - 1) * es;
     123               8 :                 if (n > 40) {
     124               0 :                         d = (n / 8) * es;
     125               0 :                         pl = med3(pl, pl + d, pl + 2 * d, cmp, data);
     126               0 :                         pm = med3(pm - d, pm, pm + d, cmp, data);
     127               0 :                         pn = med3(pn - 2 * d, pn - d, pn, cmp, data);
     128                 :                 }
     129               8 :                 pm = med3(pl, pm, pn, cmp, data);
     130                 :         }
     131              10 :         swap(a, pm);
     132              10 :         pa = pb = (char *)a + es;
     133                 : 
     134              10 :         pc = pd = (char *)a + (n - 1) * es;
     135              19 :         for (;;) {
     136              77 :                 while (pb <= pc && (r = cmp(pb, a, data)) <= 0) {
     137              19 :                         if (r == 0) {
     138               4 :                                 swap_cnt = 1;
     139               4 :                                 swap(pa, pb);
     140               4 :                                 pa += es;
     141                 :                         }
     142              19 :                         pb += es;
     143                 :                 }
     144              85 :                 while (pb <= pc && (r = cmp(pc, a, data)) >= 0) {
     145              27 :                         if (r == 0) {
     146               0 :                                 swap_cnt = 1;
     147               0 :                                 swap(pc, pd);
     148               0 :                                 pd -= es;
     149                 :                         }
     150              27 :                         pc -= es;
     151                 :                 }
     152              29 :                 if (pb > pc)
     153                 :                         break;
     154              19 :                 swap(pb, pc);
     155              19 :                 swap_cnt = 1;
     156              19 :                 pb += es;
     157              19 :                 pc -= es;
     158                 :         }
     159              10 :         if (swap_cnt == 0) {  /* Switch to insertion sort */
     160               0 :                 for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
     161               0 :                         for (pl = pm; pl > (char *)a && cmp(pl - es, pl, data) > 0;
     162               0 :                              pl -= es)
     163               0 :                                 swap(pl, pl - es);
     164               0 :                 return;
     165                 :         }
     166                 : 
     167              10 :         pn = (char *)a + n * es;
     168              10 :         r = NS_MIN(pa - (char *)a, pb - pa);
     169              10 :         vecswap(a, pb - r, r);
     170              10 :         r = NS_MIN<size_t>(pd - pc, pn - pd - es);
     171              10 :         vecswap(pb, pn - r, r);
     172              10 :         if ((r = pb - pa) > (int)es)
     173               9 :         NS_QuickSort(a, r / es, es, cmp, data);
     174              10 :         if ((r = pd - pc) > (int)es) {
     175                 :                 /* Iterate rather than recurse to save stack space */
     176               8 :                 a = pn - r;
     177               8 :                 n = r / es;
     178               8 :                 goto loop;
     179                 :         }
     180                 : /*              NS_QuickSort(pn - r, r / es, es, cmp, data);*/
     181                 : }
     182                 : 
     183                 : PR_END_EXTERN_C

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