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

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 reginfo.h                                 */
   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 #ifndef REGINFO_H
  37 #define REGINFO_H
  38
  39
  40
  41 /* common */
  42 #include "inline.h"
  43
  44
  45
  46 /*****************************************************************************/
  47 /*                                   Data                                    */
  48 /*****************************************************************************/
  49
  50
  51
  52 /* Encoding for an unknown register value */
  53 #define UNKNOWN_REGVAL  -1
  54
  55 /* Register contents */
  56 typedef struct RegContents RegContents;
  57 struct RegContents {
  58     short       RegA;
  59     short       RegX;
  60     short       RegY;
  61     short       SRegLo;
  62     short       SRegHi;
  63     short       Tmp1;
  64 };
  65
  66 /* Register change info */
  67 typedef struct RegInfo RegInfo;
  68 struct RegInfo {
  69     RegContents In;             /* Incoming register values */
  70     RegContents Out;            /* Outgoing register values */
  71     RegContents Out2;           /* Alternative outgoing reg values for branches */
  72 };
  73
  74
  75
  76 /*****************************************************************************/
  77 /*                                   Code                                    */
  78 /*****************************************************************************/
  79
  80
  81
  82 void RC_Invalidate (RegContents* C);
  83 /* Invalidate all registers */
  84
  85 void RC_InvalidateZP (RegContents* C);
  86 /* Invalidate all ZP registers */
  87
  88 #if defined(HAVE_INLINE)
  89 INLINE int RegValIsKnown (short Val)
  90 /* Return true if the register value is known */
  91 {
  92     return (Val >= 0);
  93 }
  94 #else
  95 #  define RegValIsKnown(S)      ((S) >= 0)
  96 #endif
  97
  98 #if defined(HAVE_INLINE)
  99 INLINE int RegValIsUnknown (short Val)
 100 /* Return true if the register value is not known */
 101 {
 102     return (Val < 0);
 103 }
 104 #else
 105 #  define RegValIsUnknown(S)      ((S) < 0)
 106 #endif
 107
 108 RegInfo* NewRegInfo (const RegContents* RC);
 109 /* Allocate a new register info, initialize and return it. If RC is not
 110  * a NULL pointer, it is used to initialize both, the input and output
 111  * registers. If the pointer is NULL, all registers are set to unknown.
 112  */
 113
 114 void FreeRegInfo (RegInfo* RI);
 115 /* Free a RegInfo struct */
 116
 117
 118
 119
 120
 121 /* End of reginfo.h */
 122 #endif
 123
 124
 125
 126