jdk8-mips64-public/hotspot: src/share/vm/classfile/sharedPathsMiscInfo.hpp@ac27a9c85bea (annotated)

src/share/vm/classfile/sharedPathsMiscInfo.hpp@ac27a9c85bea (annotated)

src/share/vm/classfile/sharedPathsMiscInfo.hpp

Thu, 24 May 2018 18:41:44 +0800

author: aoqi
date: Thu, 24 May 2018 18:41:44 +0800
changeset 8856: ac27a9c85bea
parent 8184: f46ffa934a46
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
 #define SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
 #include "runtime/os.hpp"
 // During dumping time, when processing class paths, we build up the dump-time
 // classpath. The JAR files that exist are stored in the list ClassLoader::_first_entry.
 // However, we need to store other "misc" information for run-time checking, such as
 //
 // + The values of Arguments::get_sysclasspath() used during dumping.
 //
 // + The meta-index file(s) used during dumping (incl modification time and size)
 //
 // + The class path elements specified during dumping but did not exist --
 //   these elements must also be specified at run time, and they also must not
 //   exist at run time.
 //
 // These misc items are stored in a linear buffer in SharedPathsMiscInfo.
 // The storage format is stream oriented to minimize its size.
 //
 // When writing the information to the archive file, SharedPathsMiscInfo is stored in
 // the archive file header. At run-time, this information is used only during initialization
 // (accessed using read() instead of mmap()), and is deallocated afterwards to save space.
 //
 // The SharedPathsMiscInfo class is used for both creating the the information (during
 // dumping time) and validation (at run time). Different constructors are used in the
 // two situations. See below.
 class SharedPathsMiscInfo : public CHeapObj<mtClass> {
 protected:
   char* _buf_start;
   char* _cur_ptr;
   char* _end_ptr;
   int   _buf_size;
   bool  _allocated;   // was _buf_start allocated by me?
   void ensure_size(size_t needed_bytes);
   void add_path(const char* path, int type);
   void write(const void* ptr, size_t size);
   bool read(void* ptr, size_t size);
   static void trace_class_path(const char* msg, const char* name = NULL) {
     ClassLoader::trace_class_path(tty, msg, name);
   }
 protected:
   static bool fail(const char* msg, const char* name = NULL);
   virtual bool check(jint type, const char* path);
 public:
   enum {
     INITIAL_BUF_SIZE = 128
   };
   // This constructor is used when creating the misc information (during dump)
   SharedPathsMiscInfo() {
     _buf_size = INITIAL_BUF_SIZE;
     _cur_ptr = _buf_start = NEW_C_HEAP_ARRAY(char, _buf_size, mtClass);
     _allocated = true;
   }
   // This constructor is used when validating the misc info (during run time)
   SharedPathsMiscInfo(char *buff, int size) {
     _cur_ptr = _buf_start = buff;
     _end_ptr = _buf_start + size;
     _buf_size = size;
     _allocated = false;
   }
   ~SharedPathsMiscInfo() {
     if (_allocated) {
       FREE_C_HEAP_ARRAY(char, _buf_start, mtClass);
     }
   }
   int get_used_bytes() {
     return _cur_ptr - _buf_start;
   }
   void* buffer() {
     return _buf_start;
   }
   // writing --
   // The path must not exist at run-time
   void add_nonexist_path(const char* path) {
     add_path(path, NON_EXIST);
   }
   // The path must exist and have required size and modification time
   void add_required_file(const char* path) {
     add_path(path, REQUIRED);
     struct stat st;
     if (os::stat(path, &st) != 0) {
       assert(0, "sanity");
       ClassLoader::exit_with_path_failure("failed to os::stat(%s)", path); // should not happen
     }
     write_time(st.st_mtime);
     write_long(st.st_size);
   }
   // The path must exist, and must contain exactly <num_entries> files/dirs
   void add_boot_classpath(const char* path) {
     add_path(path, BOOT);
   }
   int write_jint(jint num) {
     write(&num, sizeof(num));
     return 0;
   }
   void write_time(time_t t) {
     write(&t, sizeof(t));
   }
   void write_long(long l) {
     write(&l, sizeof(l));
   }
   bool dump_to_file(int fd) {
     int n = get_used_bytes();
     return (os::write(fd, _buf_start, n) == (size_t)n);
   }
   // reading --
   enum {
     BOOT      = 1,
     NON_EXIST = 2,
     REQUIRED  = 3
   };
   virtual const char* type_name(int type) {
     switch (type) {
     case BOOT:      return "BOOT";
     case NON_EXIST: return "NON_EXIST";
     case REQUIRED:  return "REQUIRED";
     default:        ShouldNotReachHere(); return "?";
     }
   }
   virtual void print_path(outputStream* out, int type, const char* path) {
     switch (type) {
     case BOOT:
       out->print("Expecting -Dsun.boot.class.path=%s", path);
       break;
     case NON_EXIST:
       out->print("Expecting that %s does not exist", path);
       break;
     case REQUIRED:
       out->print("Expecting that file %s must exist and is not altered", path);
       break;
     default:
       ShouldNotReachHere();
     }
   }
   bool check();
   bool read_jint(jint *ptr) {
     return read(ptr, sizeof(jint));
   }
   bool read_long(long *ptr) {
     return read(ptr, sizeof(long));
   }
   bool read_time(time_t *ptr) {
     return read(ptr, sizeof(time_t));
   }
 };
 #endif // SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/sharedPathsMiscInfo.hpp@ac27a9c85bea (annotated)

src/share/vm/classfile/sharedPathsMiscInfo.hpp