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

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                  loop.c                                   */
   4 /*                                                                           */
   5 /*                              Loop management                              */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998-2004 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 /* common */
  37 #include "check.h"
  38 #include "xmalloc.h"
  39
  40 /* cc65 */
  41 #include "error.h"
  42 #include "loop.h"
  43 #include "stackptr.h"
  44
  45
  46
  47 /*****************************************************************************/
  48 /*                                   Data                                    */
  49 /*****************************************************************************/
  50
  51
  52
  53 /* The root */
  54 static LoopDesc* LoopStack = 0;
  55
  56
  57
  58 /*****************************************************************************/
  59 /*                                   Code                                    */
  60 /*****************************************************************************/
  61
  62
  63
  64 LoopDesc* AddLoop (unsigned BreakLabel, unsigned ContinueLabel)
  65 /* Create and add a new loop descriptor. */
  66 {
  67     /* Allocate a new struct */
  68     LoopDesc* L = xmalloc (sizeof (LoopDesc));
  69
  70     /* Fill in the data */
  71     L->StackPtr         = StackPtr;
  72     L->BreakLabel       = BreakLabel;
  73     L->ContinueLabel    = ContinueLabel;
  74
  75     /* Insert it into the list */
  76     L->Next = LoopStack;
  77     LoopStack = L;
  78
  79     /* Return a pointer to the struct */
  80     return L;
  81 }
  82
  83
  84
  85 LoopDesc* CurrentLoop (void)
  86 /* Return a pointer to the descriptor of the current loop */
  87 {
  88     return LoopStack;
  89 }
  90
  91
  92
  93 void DelLoop (void)
  94 /* Remove the current loop */
  95 {
  96     LoopDesc* L = LoopStack;
  97     CHECK (L != 0);
  98     LoopStack = LoopStack->Next;
  99     xfree (L);
 100 }