jdk

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/*
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 * Copyright (c) 2012, 2023 SAP SE. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include <stdio.h>
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#include <string.h>
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#include <sys/ldr.h>
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#include <errno.h>
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#include "porting_aix.h"
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static unsigned char dladdr_buffer[0x8000];
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static void fill_dll_info(void) {
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  int rc = loadquery(L_GETINFO,dladdr_buffer, sizeof(dladdr_buffer));
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  if (rc == -1) {
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    fprintf(stderr, "loadquery failed (%d %s)", errno, strerror(errno));
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    fflush(stderr);
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  }
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}
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static int dladdr_dont_reload(void* addr, Dl_info* info) {
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  const struct ld_info* p = (struct ld_info*) dladdr_buffer;
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  memset((void *)info, 0, sizeof(Dl_info));
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  for (;;) {
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    if (addr >= p->ldinfo_textorg &&
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        (char*)addr < (char*)(p->ldinfo_textorg) + p->ldinfo_textsize) {
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      info->dli_fname = p->ldinfo_filename;
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      info->dli_fbase = p->ldinfo_textorg;
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      return 1; /* [sic] */
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    }
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    if (!p->ldinfo_next) {
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      break;
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    }
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    p = (struct ld_info*)(((char*)p) + p->ldinfo_next);
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  }
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  return 0; /* [sic] */
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}
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#ifdef __cplusplus
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extern "C"
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#endif
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int dladdr(void *addr, Dl_info *info) {
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  static int loaded = 0;
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  if (!loaded) {
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    fill_dll_info();
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    loaded = 1;
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  }
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  if (!addr) {
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    return 0;  /* [sic] */
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  }
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  /* Address could be AIX function descriptor? */
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  void* const addr0 = *( (void**) addr );
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  int rc = dladdr_dont_reload(addr, info);
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  if (rc == 0) {
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    rc = dladdr_dont_reload(addr0, info);
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    if (rc == 0) { /* [sic] */
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      fill_dll_info(); /* refill, maybe loadquery info is outdated */
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      rc = dladdr_dont_reload(addr, info);
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      if (rc == 0) {
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        rc = dladdr_dont_reload(addr0, info);
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      }
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    }
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  }
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  return rc;
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}
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