git.sur5r.net Git - cc65/blob - src/ca65/ulabel.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 ulabel.h                                  */
   4 /*                                                                           */
   5 /*                Unnamed labels for the ca65 macroassembler                 */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2000-2011, Ullrich von Bassewitz                                      */
  10 /*                Roemerstrasse 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 #ifndef ULABEL_H
  37 #define ULABEL_H
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Code                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 ExprNode* ULabRef (int Which);
  48 /* Get an unnamed label. If Which is negative, it is a backreference (a
  49  * reference to an already defined label), and the function will return a
  50  * segment relative expression. If Which is positive, it is a forward ref,
  51  * and the function will return a expression node for an unnamed label that
  52  * must be resolved later.
  53  */
  54
  55 void ULabDef (void);
  56 /* Define an unnamed label at the current PC */
  57
  58 int ULabCanResolve (void);
  59 /* Return true if we can resolve arbitrary ULabels. */
  60
  61 ExprNode* ULabResolve (unsigned Index);
  62 /* Return a valid expression for the unnamed label with the given index. This
  63  * is used to resolve unnamed labels when assembly is done, so it is an error
  64  * if a label is still undefined in this phase.
  65  */
  66
  67 void ULabDone (void);
  68 /* Run through all unnamed labels, check for anomalies and errors and do
  69  * necessary cleanups.
  70  */
  71
  72
  73
  74 /* End of ulabel.h */
  75
  76 #endif
  77
  78
  79