git.sur5r.net Git - cc65/blob - src/da65/segment.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 segment.c                                 */
   4 /*                                                                           */
   5 /*                         Segment handling for da65                         */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2007      Ullrich von Bassewitz                                       */
  10 /*               Roemerstrasse 52                                            */
  11 /*               D-70794 Filderstadt                                         */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <string.h>
  37
  38 /* common */
  39 #include "addrsize.h"
  40 #include "xmalloc.h"
  41
  42 /* da65 */
  43 #include "attrtab.h"
  44 #include "segment.h"
  45
  46
  47
  48 /*****************************************************************************/
  49 /*                                   Data                                    */
  50 /*****************************************************************************/
  51
  52
  53
  54 /* Hash definitions */
  55 #define HASH_SIZE       64              /* Must be power of two */
  56 #define HASH_MASK       (HASH_SIZE-1)
  57
  58 /* Segment definition */
  59 typedef struct Segment Segment;
  60 struct Segment {
  61     Segment*            NextStart;      /* Pointer to next segment */
  62     Segment*            NextEnd;        /* Pointer to next segment */
  63     unsigned long       Start;
  64     unsigned long       End;
  65     unsigned            AddrSize;
  66     char                Name[1];        /* Name, dynamically allocated */
  67 };
  68
  69 /* Tables containing the segments. A segment is inserted using it's hash
  70  * value. Collision is done by single linked lists.
  71  */
  72 static Segment* StartTab[HASH_SIZE];    /* Table containing segment starts */
  73 static Segment* EndTab[HASH_SIZE];      /* Table containing segment ends */
  74
  75
  76
  77 /*****************************************************************************/
  78 /*                                   Code                                    */
  79 /*****************************************************************************/
  80
  81
  82
  83 void AddAbsSegment (unsigned Start, unsigned End, const char* Name)
  84 /* Add an absolute segment to the segment table */
  85 {
  86     /* Get the length of the name */
  87     unsigned Len = strlen (Name);
  88
  89     /* Create a new segment */
  90     Segment* S = xmalloc (sizeof (Segment) + Len);
  91
  92     /* Fill in the data */
  93     S->Start    = Start;
  94     S->End      = End;
  95     S->AddrSize = ADDR_SIZE_ABS;
  96     memcpy (S->Name, Name, Len + 1);
  97
  98     /* Insert the segment into the hash tables */
  99     S->NextStart = StartTab[Start & HASH_MASK];
 100     StartTab[Start & HASH_MASK] = S;
 101     S->NextEnd = EndTab[End & HASH_MASK];
 102     EndTab[End & HASH_MASK] = S;
 103
 104     /* Mark the addresses within the segment */
 105     MarkRange (Start, End, atSegment);
 106 }
 107
 108
 109