git.sur5r.net Git - cc65/blob - src/cc65/codeinfo.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                codeinfo.c                                 */
   4 /*                                                                           */
   5 /*                  Additional information about 6502 code                   */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2001      Ullrich von Bassewitz                                       */
  10 /*               Wacholderweg 14                                             */
  11 /*               D-70597 Stuttgart                                           */
  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 <stdlib.h>
  37 #include <string.h>
  38
  39 /* cc65 */
  40 #include "codeinfo.h"
  41
  42
  43
  44 /*****************************************************************************/
  45 /*                                   Data                                    */
  46 /*****************************************************************************/
  47
  48
  49
  50 /* Table listing the function names and code info values for known internally
  51  * used functions. This table should get auto-generated in the future.
  52  */
  53 typedef struct FuncInfo FuncInfo;
  54 struct FuncInfo {
  55     const char*     Name;       /* Function name */
  56     unsigned char   Use;        /* Register usage */
  57     unsigned char   Chg;        /* Changed/destroyed registers */
  58 };
  59
  60 static const FuncInfo FuncInfoTable[] = {
  61     { "booleq",         REG_NONE,       REG_AX  },
  62     { "boolge",         REG_NONE,       REG_AX  },
  63     { "boolgt",         REG_NONE,       REG_AX  },
  64     { "boolle",         REG_NONE,       REG_AX  },
  65     { "boollt",         REG_NONE,       REG_AX  },
  66     { "boolne",         REG_NONE,       REG_AX  },
  67     { "booluge",        REG_NONE,       REG_AX  },
  68     { "boolugt",        REG_NONE,       REG_AX  },
  69     { "boolule",        REG_NONE,       REG_AX  },
  70     { "boolult",        REG_NONE,       REG_AX  },
  71     { "decax1",         REG_AX,         REG_AX  },
  72     { "decax2",         REG_AX,         REG_AX  },
  73     { "decax3",         REG_AX,         REG_AX  },
  74     { "decax4",         REG_AX,         REG_AX  },
  75     { "decax5",         REG_AX,         REG_AX  },
  76     { "decax6",         REG_AX,         REG_AX  },
  77     { "decax7",         REG_AX,         REG_AX  },
  78     { "decax8",         REG_AX,         REG_AX  },
  79     { "decaxy",         REG_AXY,        REG_AX  },
  80     { "decsp2",         REG_NONE,       REG_A   },
  81     { "decsp3",         REG_NONE,       REG_A   },
  82     { "decsp4",         REG_NONE,       REG_A   },
  83     { "decsp5",         REG_NONE,       REG_A   },
  84     { "decsp6",         REG_NONE,       REG_A   },
  85     { "decsp7",         REG_NONE,       REG_A   },
  86     { "decsp8",         REG_NONE,       REG_A   },
  87     { "ldax0sp",        REG_Y,          REG_AX  },
  88     { "ldaxysp",        REG_Y,          REG_AX  },
  89     { "pusha",          REG_A,          REG_Y   },
  90     { "pusha0",         REG_A,          REG_XY  },
  91     { "pushax",         REG_AX,         REG_Y   },
  92     { "pushw0sp",       REG_NONE,       REG_AXY },
  93     { "pushwysp",       REG_Y,          REG_AXY },
  94     { "tosicmp",        REG_AX,         REG_AXY },
  95 };
  96 #define FuncInfoCount   (sizeof(FuncInfoTable) / sizeof(FuncInfoTable[0]))
  97
  98
  99
 100 /*****************************************************************************/
 101 /*                                   Code                                    */
 102 /*****************************************************************************/
 103
 104
 105
 106 static int CompareFuncInfo (const void* Key, const void* Info)
 107 /* Compare function for bsearch */
 108 {
 109     return strcmp (Key, ((const FuncInfo*) Info)->Name);
 110 }
 111
 112
 113
 114 void GetFuncInfo (const char* Name, unsigned char* Use, unsigned char* Chg)
 115 /* For the given function, lookup register information and combine it with
 116  * the information already in place. If the function is unknown, assume it
 117  * will use all registers and load all registers.
 118  * See codeinfo.h for possible flags.
 119  */
 120 {
 121     /* Search for the function */
 122     const FuncInfo* Info = bsearch (Name, FuncInfoTable, FuncInfoCount,
 123                                     sizeof(FuncInfo), CompareFuncInfo);
 124
 125     /* Do we know the function? */
 126     if (Info) {
 127         /* Use the information we have */
 128         *Use |= Info->Use;
 129         *Chg |= Info->Chg;
 130     } else {
 131         *Use |= REG_AXY;
 132         *Chg |= REG_AXY;
 133     }
 134 }
 135
 136
 137
 138