1 /*
   2  * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_CLASSFILE_CLASSLOADEREXT_HPP
  26 #define SHARE_CLASSFILE_CLASSLOADEREXT_HPP
  27 
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/moduleEntry.hpp"
  30 #include "utilities/macros.hpp"
  31 
  32 class ClassListParser;
  33 
  34 class ClassLoaderExt: public ClassLoader { // AllStatic
  35 public:
  36   static bool should_verify(int classpath_index) {
  37     CDS_ONLY(return (classpath_index >= _app_class_paths_start_index);)
  38     NOT_CDS(return false;)
  39   }
  40 
  41 #if INCLUDE_CDS
  42 private:
  43   enum SomeConstants {
  44     max_classpath_index = 0x7fff
  45   };
  46 
  47   static char* get_class_path_attr(const char* jar_path, char* manifest, jint manifest_size);
  48   static void setup_app_search_path(); // Only when -Xshare:dump
  49   static void process_module_table(ModuleEntryTable* met, TRAPS);
  50   static SharedPathsMiscInfo* shared_paths_misc_info() {
  51     return (SharedPathsMiscInfo*)_shared_paths_misc_info;
  52   }
  53   // index of first app JAR in shared classpath entry table
  54   static jshort _app_class_paths_start_index;
  55   // index of first modular JAR in shared modulepath entry table
  56   static jshort _app_module_paths_start_index;
  57   // the largest path index being used during CDS dump time
  58   static jshort _max_used_path_index;
  59 
  60   static bool _has_app_classes;
  61   static bool _has_platform_classes;
  62 
  63   static char* read_manifest(ClassPathEntry* entry, jint *manifest_size, bool clean_text, TRAPS);
  64   static ClassPathEntry* find_classpath_entry_from_cache(const char* path, TRAPS);
  65 
  66 public:
  67   static void process_jar_manifest(ClassPathEntry* entry, bool check_for_duplicates);
  68 
  69   // Called by JVMTI code to add boot classpath
  70   static void append_boot_classpath(ClassPathEntry* new_entry);
  71 
  72   static void setup_search_paths();
  73   static void setup_module_paths(TRAPS);
  74 
  75   static char* read_manifest(ClassPathEntry* entry, jint *manifest_size, TRAPS) {
  76     // Remove all the new-line continuations (which wrap long lines at 72 characters, see
  77     // http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest), so
  78     // that the manifest is easier to parse.
  79     return read_manifest(entry, manifest_size, true, THREAD);
  80   }
  81   static char* read_raw_manifest(ClassPathEntry* entry, jint *manifest_size, TRAPS) {
  82     // Do not remove new-line continuations, so we can easily pass it as an argument to
  83     // java.util.jar.Manifest.getManifest() at run-time.
  84     return read_manifest(entry, manifest_size, false, THREAD);
  85   }
  86 
  87   static void finalize_shared_paths_misc_info();
  88 
  89   static jshort app_class_paths_start_index() { return _app_class_paths_start_index; }
  90 
  91   static jshort app_module_paths_start_index() { return _app_module_paths_start_index; }
  92 
  93   static jshort max_used_path_index() { return _max_used_path_index; }
  94 
  95   static void set_max_used_path_index(jshort used_index) {
  96     _max_used_path_index = used_index;
  97   }
  98 
  99   static void init_paths_start_index(jshort app_start) {
 100     _app_class_paths_start_index = app_start;
 101   }
 102 
 103   static void init_app_module_paths_start_index(jshort module_start) {
 104     _app_module_paths_start_index = module_start;
 105   }
 106 
 107   static bool is_boot_classpath(int classpath_index) {
 108     return classpath_index < _app_class_paths_start_index;
 109   }
 110 
 111   static bool has_platform_or_app_classes() {
 112     return _has_app_classes || _has_platform_classes;
 113   }
 114 
 115   static void record_result(const s2 classpath_index,
 116                             InstanceKlass* result, TRAPS);
 117   static InstanceKlass* load_class(Symbol* h_name, const char* path, TRAPS);
 118   static void set_has_app_classes() {
 119     _has_app_classes = true;
 120   }
 121   static void set_has_platform_classes() {
 122     _has_platform_classes = true;
 123   }
 124 #endif
 125 };
 126 
 127 #endif // SHARE_CLASSFILE_CLASSLOADEREXT_HPP