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 "thread.h"
  19 #include "genesis/primitive-objects.h"
  20
  21 boolean search_for_type(int type, lispobj **start, int *count)
  22 {
  23     lispobj obj, *addr;
  24
  25     while ((*count == -1 || (*count > 0)) &&
  26            is_valid_lisp_addr((os_vm_address_t)*start)) {
  27         obj = **start;
  28         addr = *start;
  29         if (*count != -1)
  30             *count -= 2;
  31
  32         if (widetag_of(obj) == type)
  33             return 1;
  34
  35         (*start) += 2;
  36     }
  37     return 0;
  38 }
  39
  40 boolean search_for_symbol(char *name, lispobj **start, int *count)
  41 {
  42     struct symbol *symbol;
  43     struct vector *symbol_name;
  44
  45     while (search_for_type(SYMBOL_HEADER_WIDETAG, start, count)) {
  46         symbol = (struct symbol *)native_pointer((lispobj)*start);
  47         if (lowtag_of(symbol->name) == OTHER_POINTER_LOWTAG) {
  48             symbol_name = (struct vector *)native_pointer(symbol->name);
  49             if (is_valid_lisp_addr((os_vm_address_t)symbol_name) &&
  50                 widetag_of(symbol_name->header) == SIMPLE_STRING_WIDETAG &&
  51                 strcmp((char *)symbol_name->data, name) == 0)
  52                 return 1;
  53         }
  54         (*start) += 2;
  55     }
  56     return 0;
  57 }