Esempio n. 1
0
constMethodOop constMethodKlass::allocate(int byte_code_size,
                                          int compressed_line_number_size,
                                          int localvariable_table_length,
                                          int checked_exceptions_length,
                                          bool is_conc_safe,
                                          TRAPS) {

  int size = constMethodOopDesc::object_size(byte_code_size,
                                             compressed_line_number_size,
                                             localvariable_table_length,
                                             checked_exceptions_length);
  KlassHandle h_k(THREAD, as_klassOop());
  constMethodOop cm = (constMethodOop)
    CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
  assert(!cm->is_parsable(), "Not yet safely parsable");
  No_Safepoint_Verifier no_safepoint;
  cm->set_interpreter_kind(Interpreter::invalid);
  cm->init_fingerprint();
  cm->set_method(NULL);
  cm->set_stackmap_data(NULL);
  cm->set_exception_table(NULL);
  cm->set_code_size(byte_code_size);
  cm->set_constMethod_size(size);
  cm->set_inlined_tables_length(checked_exceptions_length,
                                compressed_line_number_size,
                                localvariable_table_length);
  assert(cm->size() == size, "wrong size for object");
  cm->set_is_conc_safe(is_conc_safe);
  cm->set_partially_loaded();
  assert(cm->is_parsable(), "Is safely parsable by gc");
  return cm;
}
Esempio n. 2
0
void constMethodKlass::oop_verify_on(oop obj, outputStream* st) {
  Klass::oop_verify_on(obj, st);
  guarantee(obj->is_constMethod(), "object must be constMethod");
  constMethodOop m = constMethodOop(obj);
  guarantee(m->is_perm(),                            "should be in permspace");

  // Verification can occur during oop construction before the method or
  // other fields have been initialized.
  if (!obj->partially_loaded()) {
    guarantee(m->method()->is_perm(), "should be in permspace");
    guarantee(m->method()->is_method(), "should be method");
    typeArrayOop stackmap_data = m->stackmap_data();
    guarantee(stackmap_data == NULL ||
              stackmap_data->is_perm(),  "should be in permspace");
    guarantee(m->exception_table()->is_perm(), "should be in permspace");
    guarantee(m->exception_table()->is_typeArray(), "should be type array");

    address m_end = (address)((oop*) m + m->size());
    address compressed_table_start = m->code_end();
    guarantee(compressed_table_start <= m_end, "invalid method layout");
    address compressed_table_end = compressed_table_start;
    // Verify line number table
    if (m->has_linenumber_table()) {
      CompressedLineNumberReadStream stream(m->compressed_linenumber_table());
      while (stream.read_pair()) {
        guarantee(stream.bci() >= 0 && stream.bci() <= m->code_size(), "invalid bci in line number table");
      }
      compressed_table_end += stream.position();
    }
    guarantee(compressed_table_end <= m_end, "invalid method layout");
    // Verify checked exceptions and local variable tables
    if (m->has_checked_exceptions()) {
      u2* addr = m->checked_exceptions_length_addr();
      guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
    }
    if (m->has_localvariable_table()) {
      u2* addr = m->localvariable_table_length_addr();
      guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
    }
    // Check compressed_table_end relative to uncompressed_table_start
    u2* uncompressed_table_start;
    if (m->has_localvariable_table()) {
      uncompressed_table_start = (u2*) m->localvariable_table_start();
    } else {
      if (m->has_checked_exceptions()) {
        uncompressed_table_start = (u2*) m->checked_exceptions_start();
      } else {
        uncompressed_table_start = (u2*) m_end;
      }
    }
    int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
    int max_gap = align_object_size(1)*BytesPerWord;
    guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
  }
}