os::find(address addr, outputStream* st)

openjdk7-hotspot os.hpp

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//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)
bool os::find(address addr, outputStream* st) {
  Dl_info dlinfo;
  memset(&dlinfo, 0, sizeof(dlinfo));
  if (dladdr(addr, &dlinfo)) {
    st->print(PTR_FORMAT ": ", addr);
    if (dlinfo.dli_sname != NULL) {
      st->print("%s+%#x", dlinfo.dli_sname,
                 addr - (intptr_t)dlinfo.dli_saddr);
    } else if (dlinfo.dli_fname) {
      st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
    } else {
      st->print("<absolute address>");
    }
    if (dlinfo.dli_fname) {
      st->print(" in %s", dlinfo.dli_fname);
    }
    if (dlinfo.dli_fbase) {
      st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
    }
    st->cr();

    if (Verbose) {
      // decode some bytes around the PC
      address begin = same_page(addr-40, addr);
      address end   = same_page(addr+40, addr);
      address       lowest = (address) dlinfo.dli_sname;
      if (!lowest)  lowest = (address) dlinfo.dli_fbase;
      if (begin < lowest)  begin = lowest;
      Dl_info dlinfo2;
      if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
          && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
        end = (address) dlinfo2.dli_saddr;
      Disassembler::decode(begin, end, st);
    }
    return true;
  }
  return false;
}