hotspot/src/share/vm/classfile/sharedPathsMiscInfo.cpp
author jiangli
Wed, 05 Apr 2017 18:15:09 -0400
changeset 46365 d79745f72ae6
parent 42876 ff8ff9dcccec
child 46701 f559541c0daa
permissions -rw-r--r--
8171042: The 'REQUIRED' type in sharedPathsMiscInfo.hpp is not used and should be removed. Summary: Remove unused REQUIRED type. Reviewed-by: dholmes, iklam
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/*
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 * Copyright (c) 2014, 2017, Oracle and/or its affiliates. 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.
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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 "precompiled.hpp"
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#include "classfile/classLoader.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/sharedPathsMiscInfo.hpp"
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#include "logging/log.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/metaspaceShared.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/arguments.hpp"
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#include "utilities/ostream.hpp"
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void SharedPathsMiscInfo::add_path(const char* path, int type) {
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  log_info(class, path)("type=%s ", type_name(type));
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  ClassLoader::trace_class_path("add misc shared path ", path);
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  write(path, strlen(path) + 1);
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  write_jint(jint(type));
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}
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void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {
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  assert(_allocated, "cannot modify buffer during validation.");
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  int used = get_used_bytes();
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  int target = used + int(needed_bytes);
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  if (target > _buf_size) {
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    _buf_size = _buf_size * 2 + (int)needed_bytes;
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    _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);
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    _cur_ptr = _buf_start + used;
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    _end_ptr = _buf_start + _buf_size;
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  }
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}
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void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
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  ensure_size(size);
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  memcpy(_cur_ptr, ptr, size);
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  _cur_ptr += size;
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}
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bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
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  if (_cur_ptr + size <= _end_ptr) {
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    memcpy(ptr, _cur_ptr, size);
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    _cur_ptr += size;
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    return true;
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  }
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  return false;
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}
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bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
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  ClassLoader::trace_class_path(msg, name);
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  MetaspaceShared::set_archive_loading_failed();
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  return false;
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}
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void SharedPathsMiscInfo::print_path(int type, const char* path) {
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  ResourceMark rm;
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  outputStream* out = Log(class, path)::info_stream();
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  switch (type) {
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  case BOOT:
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    out->print("Expecting BOOT path=%s", path);
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    break;
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  case NON_EXIST:
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    out->print("Expecting that %s does not exist", path);
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    break;
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  default:
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    ShouldNotReachHere();
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  }
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}
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bool SharedPathsMiscInfo::check() {
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  // The whole buffer must be 0 terminated so that we can use strlen and strcmp
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  // without fear.
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  _end_ptr -= sizeof(jint);
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  if (_cur_ptr >= _end_ptr) {
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    return fail("Truncated archive file header");
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  }
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  if (*_end_ptr != 0) {
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    return fail("Corrupted archive file header");
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  }
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  while (_cur_ptr < _end_ptr) {
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    jint type;
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    const char* path = _cur_ptr;
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    _cur_ptr += strlen(path) + 1;
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    if (!read_jint(&type)) {
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      return fail("Corrupted archive file header");
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    }
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    log_info(class, path)("type=%s ", type_name(type));
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    print_path(type, path);
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    if (!check(type, path)) {
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      if (!PrintSharedArchiveAndExit) {
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        return false;
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      }
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    } else {
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      ClassLoader::trace_class_path("ok");
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    }
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  }
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  return true;
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}
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bool SharedPathsMiscInfo::check(jint type, const char* path) {
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  switch (type) {
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  case BOOT:
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    if (os::file_name_strcmp(path, Arguments::get_sysclasspath()) != 0) {
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      return fail("[BOOT classpath mismatch, actual =", Arguments::get_sysclasspath());
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    }
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    break;
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  case NON_EXIST:
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    {
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      struct stat st;
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      if (os::stat(path, &st) == 0) {
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        // The file actually exists
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        // But we want it to not exist -> fail
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        return fail("File must not exist");
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      }
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    }
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    break;
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  default:
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    return fail("Corrupted archive file header");
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  }
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  return true;
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}