src/runtime/search.c

   1 /*
   2  * This software is part of the SBCL system. See the README file for
   3  * more information.
   4  *
   5  * This software is derived from the CMU CL system, which was
   6  * written at Carnegie Mellon University and released into the
   7  * public domain. The software is in the public domain and is
   8  * provided with absolutely no warranty. See the COPYING and CREDITS
   9  * files for more information.
  10  */
  11
  12 #include <string.h>
  13
  14 #include "runtime.h"
  15 #include "sbcl.h"
  16 #include "os.h"
  17 #include "search.h"
  18 #include "primitive-objects.h"
  19
  20 boolean search_for_type(int type, lispobj **start, int *count)
  21 {
  22     lispobj obj, *addr;
  23
  24     while ((*count == -1 || (*count > 0)) &&
  25            is_valid_lisp_addr((os_vm_address_t)*start)) {
  26         obj = **start;
  27         addr = *start;
  28         if (*count != -1)
  29             *count -= 2;
  30
  31         if (widetag_of(obj) == type)
  32             return 1;
  33
  34         (*start) += 2;
  35     }
  36     return 0;
  37 }
  38
  39 boolean search_for_symbol(char *name, lispobj **start, int *count)
  40 {
  41     struct symbol *symbol;
  42     struct vector *symbol_name;
  43
  44     while (search_for_type(SYMBOL_HEADER_WIDETAG, start, count)) {
  45         symbol = (struct symbol *)native_pointer((lispobj)*start);
  46         if (lowtag_of(symbol->name) == OTHER_POINTER_LOWTAG) {
  47             symbol_name = (struct vector *)native_pointer(symbol->name);
  48             if (is_valid_lisp_addr((os_vm_address_t)symbol_name) &&
  49                 widetag_of(symbol_name->header) == SIMPLE_STRING_WIDETAG &&
  50                 strcmp((char *)symbol_name->data, name) == 0)
  51                 return 1;
  52         }
  53         (*start) += 2;
  54     }
  55     return 0;
  56 }