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

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                stackptr.c                                 */
   4 /*                                                                           */
   5 /*                    Manage the parameter stack pointer                     */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2004-2006 Ullrich von Bassewitz                                       */
  10 /*               Römerstraße 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 /* cc65 */
  37 #include "stackptr.h"
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Data                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 /* Compiler relative stackpointer */
  48 int StackPtr = 0;
  49
  50
  51
  52 /*****************************************************************************/
  53 /*                                   Code                                    */
  54 /*****************************************************************************/
  55
  56
  57
  58 void SP_Push (const Type* T)
  59 /* Adjust the stackpointer for a push of an argument of the given type */
  60 {
  61     StackPtr -= SizeOf (T);
  62 }
  63
  64
  65
  66 void SP_Pop (const Type* T)
  67 /* Adjust the stackpointer for a pop of an argument of the given type */
  68 {
  69     StackPtr += SizeOf (T);
  70 }