151 lines
4.6 KiB
C++
151 lines
4.6 KiB
C++
/*
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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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#ifndef SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
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#define SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
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#include "classfile/classLoader.hpp"
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#include "runtime/os.hpp"
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class outputStream;
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// During dumping time, when processing class paths, we build up the dump-time
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// classpath. The JAR files that exist are stored in the list ClassLoader::_first_append_entry.
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// However, we need to store other "misc" information for run-time checking, such as
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//
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// + The values of Arguments::get_sysclasspath() used during dumping.
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//
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// + The meta-index file(s) used during dumping (incl modification time and size)
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//
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// + The class path elements specified during dumping but did not exist --
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// these elements must also be specified at run time, and they also must not
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// exist at run time.
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//
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// These misc items are stored in a linear buffer in SharedPathsMiscInfo.
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// The storage format is stream oriented to minimize its size.
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//
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// When writing the information to the archive file, SharedPathsMiscInfo is stored in
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// the archive file header. At run-time, this information is used only during initialization
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// (accessed using read() instead of mmap()), and is deallocated afterwards to save space.
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//
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// The SharedPathsMiscInfo class is used for both creating the the information (during
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// dumping time) and validation (at run time). Different constructors are used in the
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// two situations. See below.
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class SharedPathsMiscInfo : public CHeapObj<mtClass> {
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protected:
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char* _buf_start;
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char* _cur_ptr;
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char* _end_ptr;
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int _buf_size;
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bool _allocated; // was _buf_start allocated by me?
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void ensure_size(size_t needed_bytes);
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void add_path(const char* path, int type);
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void write(const void* ptr, size_t size);
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bool read(void* ptr, size_t size);
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protected:
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static bool fail(const char* msg, const char* name = NULL);
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virtual bool check(jint type, const char* path);
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public:
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enum {
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INITIAL_BUF_SIZE = 128
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};
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// This constructor is used when creating the misc information (during dump)
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SharedPathsMiscInfo();
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// This constructor is used when validating the misc info (during run time)
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SharedPathsMiscInfo(char *buff, int size) {
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_cur_ptr = _buf_start = buff;
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_end_ptr = _buf_start + size;
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_buf_size = size;
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_allocated = false;
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}
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~SharedPathsMiscInfo();
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int get_used_bytes() {
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return _cur_ptr - _buf_start;
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}
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void* buffer() {
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return _buf_start;
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}
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// writing --
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// The path must not exist at run-time
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void add_nonexist_path(const char* path) {
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add_path(path, NON_EXIST);
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}
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// The path must exist, and must contain exactly <num_entries> files/dirs
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void add_boot_classpath(const char* path) {
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add_path(path, BOOT);
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}
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int write_jint(jint num) {
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write(&num, sizeof(num));
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return 0;
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}
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void write_time(time_t t) {
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write(&t, sizeof(t));
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}
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void write_long(long l) {
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write(&l, sizeof(l));
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}
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bool dump_to_file(int fd) {
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int n = get_used_bytes();
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return (os::write(fd, _buf_start, n) == (size_t)n);
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}
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// reading --
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enum {
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BOOT = 1,
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NON_EXIST = 2
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};
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virtual const char* type_name(int type) {
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switch (type) {
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case BOOT: return "BOOT";
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case NON_EXIST: return "NON_EXIST";
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default: ShouldNotReachHere(); return "?";
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}
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}
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virtual void print_path(outputStream* os, int type, const char* path);
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bool check();
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bool read_jint(jint *ptr) {
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return read(ptr, sizeof(jint));
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}
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bool read_long(long *ptr) {
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return read(ptr, sizeof(long));
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}
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bool read_time(time_t *ptr) {
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return read(ptr, sizeof(time_t));
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}
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};
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#endif // SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
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