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

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 reginfo.c                                 */
   4 /*                                                                           */
   5 /*                        6502 register tracking info                        */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2001-2002 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 /* common */
  37 #include "xmalloc.h"
  38
  39 /* cc65 */
  40 #include "reginfo.h"
  41
  42
  43
  44 /*****************************************************************************/
  45 /*                                   Code                                    */
  46 /*****************************************************************************/
  47
  48
  49
  50 void RC_Invalidate (RegContents* C)
  51 /* Invalidate all registers */
  52 {
  53     C->RegA   = UNKNOWN_REGVAL;
  54     C->RegX   = UNKNOWN_REGVAL;
  55     C->RegY   = UNKNOWN_REGVAL;
  56     C->SRegLo = UNKNOWN_REGVAL;
  57     C->SRegHi = UNKNOWN_REGVAL;
  58     C->Tmp1   = UNKNOWN_REGVAL;
  59 }
  60
  61
  62
  63 void RC_InvalidateZP (RegContents* C)
  64 /* Invalidate all ZP registers */
  65 {
  66     C->SRegLo = UNKNOWN_REGVAL;
  67     C->SRegHi = UNKNOWN_REGVAL;
  68     C->Tmp1   = UNKNOWN_REGVAL;
  69 }
  70
  71
  72
  73 RegInfo* NewRegInfo (const RegContents* RC)
  74 /* Allocate a new register info, initialize and return it. If RC is not
  75  * a NULL pointer, it is used to initialize both, the input and output
  76  * registers. If the pointer is NULL, all registers are set to unknown.
  77  */
  78 {
  79     /* Allocate memory */
  80     RegInfo* RI = xmalloc (sizeof (RegInfo));
  81
  82     /* Initialize the registers */
  83     if (RC) {
  84         RI->In   = *RC;
  85         RI->Out  = *RC;
  86         RI->Out2 = *RC;
  87     } else {
  88         RC_Invalidate (&RI->In);
  89         RC_Invalidate (&RI->Out);
  90         RC_Invalidate (&RI->Out2);
  91     }
  92
  93     /* Return the new struct */
  94     return RI;
  95 }
  96
  97
  98
  99 void FreeRegInfo (RegInfo* RI)
 100 /* Free a RegInfo struct */
 101 {
 102     xfree (RI);
 103 }
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