git.sur5r.net Git - cc65/blob - src/ca65/symbol.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 symbol.c                                  */
   4 /*                                                                           */
   5 /*                   Parse a symbol name and search for it                   */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998-2003 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 #include <string.h>
  37
  38 /* ca65 */
  39 #include "error.h"
  40 #include "nexttok.h"
  41 #include "scanner.h"
  42 #include "symbol.h"
  43 #include "symtab.h"
  44
  45
  46
  47 /*****************************************************************************/
  48 /*                                   Data                                    */
  49 /*****************************************************************************/
  50
  51
  52
  53 /*****************************************************************************/
  54 /*                                   Code                                    */
  55 /*****************************************************************************/
  56
  57
  58
  59 SymEntry* ParseScopedSymName (int AllocNew)
  60 /* Parse a (possibly scoped) symbol name, search for it in the symbol table
  61  * and return the symbol table entry.
  62  */
  63 {
  64     /* Get the starting table */
  65     SymTable* Scope;
  66     if (Tok == TOK_NAMESPACE) {
  67         Scope = RootScope;
  68         NextTok ();
  69     } else {
  70         Scope = CurrentScope;
  71         /* ### Need to walk up the tree */
  72     }
  73
  74     /* Resolve scopes */
  75     while (1) {
  76
  77         /* An identifier must follow. Remember and skip it. */
  78         char Name[sizeof (SVal)];
  79         if (Tok != TOK_IDENT) {
  80             Error ("Identifier expected");
  81             return 0;
  82         }
  83         strcpy (Name, SVal);
  84         NextTok ();
  85
  86         /* If the next token is a namespace token, handle the name as the
  87          * name of a scope, otherwise it's the name of a symbol in that
  88          * scope.
  89          */
  90
  91         if (Tok == TOK_NAMESPACE) {
  92
  93             /* Search for the child scope */
  94             Scope = SymFindScope (Scope, Name, AllocNew);
  95
  96             /* Skip the namespace token */
  97             NextTok ();
  98
  99             /* If we didn't find the scope, bail out */
 100             if (Scope == 0) {
 101                 return 0;
 102             }
 103
 104         } else {
 105
 106             /* Search for the symbol and return it */
 107             return SymFind (Scope, Name, AllocNew);
 108
 109         }
 110     }
 111 }
 112
 113
 114
 115 SymTable* ParseScopedSymTable (int AllocNew)
 116 /* Parse a (possibly scoped) symbol table (scope) name, search for it in the
 117  * symbol space and return the symbol table struct.
 118  */
 119 {
 120     /* Get the starting table */
 121     SymTable* Scope;
 122     if (Tok == TOK_NAMESPACE) {
 123         Scope = RootScope;
 124         NextTok ();
 125     } else {
 126         Scope = CurrentScope;
 127         if (Tok != TOK_IDENT) {
 128             Error ("Identifier expected");
 129             return Scope;
 130         }
 131
 132         /* If no new scope should be allocated, the scope may specify any
 133          * scope in any of the parent scopes, so search for it.
 134          */
 135         if (!AllocNew) {
 136             Scope = SymFindAnyScope (Scope, SVal);
 137             NextTok ();
 138             if (Tok != TOK_NAMESPACE) {
 139                 return Scope;
 140             }
 141             NextTok ();
 142         }
 143     }
 144
 145     /* Resolve scopes. */
 146     while (Tok == TOK_IDENT) {
 147
 148         /* Search for the child scope if we have a valid parent */
 149         if (Scope) {
 150             Scope = SymFindScope (Scope, SVal, AllocNew);
 151         }
 152
 153         /* Skip the name token */
 154         NextTok ();
 155
 156         /* If a namespace token follows, read on, otherwise bail out */
 157         if (Tok == TOK_NAMESPACE) {
 158             NextTok ();
 159             if (Tok != TOK_IDENT) {
 160                 Error ("Identifier expected");
 161             }
 162         } else {
 163             break;
 164         }
 165     }
 166
 167     /* Return the scope we found or created */
 168     return Scope;
 169 }
 170
 171
 172