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

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                  goto.c                                   */
   4 /*                                                                           */
   5 /*              Goto and label handling for the cc65 C compiler              */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2000     Ullrich von Bassewitz                                        */
  10 /*              Wacholderweg 14                                              */
  11 /*              D-70597 Stuttgart                                            */
  12 /* EMail:       uz@musoftware.de                                             */
  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 #include "codegen.h"
  37 #include "error.h"
  38 #include "scanner.h"
  39 #include "symtab.h"
  40 #include "goto.h"
  41
  42
  43
  44 /*****************************************************************************/
  45 /*                                   Code                                    */
  46 /*****************************************************************************/
  47
  48
  49
  50 void GotoStatement (void)
  51 /* Process a goto statement. */
  52 {
  53     /* Eat the "goto" */
  54     NextToken ();
  55
  56     /* Label name must follow */
  57     if (CurTok.Tok != TOK_IDENT) {
  58
  59         Error ("Label name expected");
  60
  61     } else {
  62
  63         /* Add a new label symbol if we don't have one until now */
  64         SymEntry* Entry = AddLabelSym (CurTok.Ident, SC_REF | SC_GOTO);
  65
  66         /* Jump to the label */
  67         g_jump (Entry->V.L.Label);
  68     }
  69
  70     /* Eat the label name */
  71     NextToken ();
  72 }
  73
  74
  75
  76 void DoLabel (void)
  77 /* Define a label. */
  78 {
  79     /* Add a label symbol */
  80     SymEntry* Entry = AddLabelSym (CurTok.Ident, SC_DEF);
  81
  82     /* Emit the jump label */
  83     g_defcodelabel (Entry->V.L.Label);
  84
  85     /* Eat the ident and colon */
  86     NextToken ();
  87     NextToken ();
  88 }