1 /*
2 * Copyright (c) 2015, 2018, 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 *
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/klassFactory.hpp"
32 #include "memory/filemap.hpp"
33 #include "memory/metaspaceShared.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "prims/jvmtiEnvBase.hpp"
36 #include "prims/jvmtiRedefineClasses.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "utilities/macros.hpp"
39 #if INCLUDE_JFR
40 #include "jfr/support/jfrKlassExtension.hpp"
41 #endif
42
43
44 // called during initial loading of a shared class
45 InstanceKlass* KlassFactory::check_shared_class_file_load_hook(
46 InstanceKlass* ik,
47 Symbol* class_name,
48 Handle class_loader,
49 Handle protection_domain, TRAPS) {
50 #if INCLUDE_CDS && INCLUDE_JVMTI
51 assert(ik != NULL, "sanity");
52 assert(ik->is_shared(), "expecting a shared class");
53
54 if (JvmtiExport::should_post_class_file_load_hook()) {
55 assert(THREAD->is_Java_thread(), "must be JavaThread");
56
57 // Post the CFLH
58 JvmtiCachedClassFileData* cached_class_file = NULL;
59 JvmtiCachedClassFileData* archived_class_data = ik->get_archived_class_data();
60 assert(archived_class_data != NULL, "shared class has no archived class data");
61 unsigned char* ptr =
62 VM_RedefineClasses::get_cached_class_file_bytes(archived_class_data);
63 unsigned char* end_ptr =
64 ptr + VM_RedefineClasses::get_cached_class_file_len(archived_class_data);
65 unsigned char* old_ptr = ptr;
66 JvmtiExport::post_class_file_load_hook(class_name,
67 class_loader,
68 protection_domain,
69 &ptr,
70 &end_ptr,
71 &cached_class_file);
72 if (old_ptr != ptr) {
73 // JVMTI agent has modified class file data.
74 // Set new class file stream using JVMTI agent modified class file data.
75 ClassLoaderData* loader_data =
76 ClassLoaderData::class_loader_data(class_loader());
77 int path_index = ik->shared_classpath_index();
78 const char* pathname;
79 if (path_index < 0) {
80 // shared classes loaded by user defined class loader
81 // do not have shared_classpath_index
82 ModuleEntry* mod_entry = ik->module();
83 if (mod_entry != NULL && (mod_entry->location() != NULL)) {
84 ResourceMark rm;
85 pathname = (const char*)(mod_entry->location()->as_C_string());
86 } else {
87 pathname = "";
88 }
89 } else {
90 SharedClassPathEntry* ent =
91 (SharedClassPathEntry*)FileMapInfo::shared_path(path_index);
92 pathname = ent == NULL ? NULL : ent->name();
93 }
94 ClassFileStream* stream = new ClassFileStream(ptr,
95 end_ptr - ptr,
96 pathname,
97 ClassFileStream::verify);
98 ClassFileParser parser(stream,
99 class_name,
100 loader_data,
101 protection_domain,
102 NULL,
103 NULL,
104 ClassFileParser::BROADCAST, // publicity level
105 CHECK_NULL);
106 InstanceKlass* new_ik = parser.create_instance_klass(true /* changed_by_loadhook */,
107 CHECK_NULL);
108 if (cached_class_file != NULL) {
109 new_ik->set_cached_class_file(cached_class_file);
110 }
111
112 if (class_loader.is_null()) {
113 ResourceMark rm;
114 ClassLoader::add_package(class_name->as_C_string(), path_index, THREAD);
115 }
116
219 ClassFileParser::BROADCAST, // publicity level
220 CHECK_NULL);
221
222 InstanceKlass* result = parser.create_instance_klass(old_stream != stream, CHECK_NULL);
223 assert(result == parser.create_instance_klass(old_stream != stream, THREAD), "invariant");
224
225 if (result == NULL) {
226 return NULL;
227 }
228
229 if (cached_class_file != NULL) {
230 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
231 result->set_cached_class_file(cached_class_file);
232 }
233
234 JFR_ONLY(ON_KLASS_CREATION(result, parser, THREAD);)
235
236 #if INCLUDE_CDS
237 if (DumpSharedSpaces) {
238 ClassLoader::record_result(result, stream, THREAD);
239 #if INCLUDE_JVMTI
240 assert(cached_class_file == NULL, "Sanity");
241 // Archive the class stream data into the optional data section
242 JvmtiCachedClassFileData *p;
243 int len;
244 const unsigned char *bytes;
245 // event based tracing might set cached_class_file
246 if ((bytes = result->get_cached_class_file_bytes()) != NULL) {
247 len = result->get_cached_class_file_len();
248 } else {
249 len = stream->length();
250 bytes = stream->buffer();
251 }
252 p = (JvmtiCachedClassFileData*)os::malloc(offset_of(JvmtiCachedClassFileData, data) + len, mtInternal);
253 p->length = len;
254 memcpy(p->data, bytes, len);
255 result->set_archived_class_data(p);
256 #endif // INCLUDE_JVMTI
257 }
258 #endif // INCLUDE_CDS
259
260 return result;
261 }
|
1 /*
2 * Copyright (c) 2015, 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 *
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/klassFactory.hpp"
32 #include "memory/filemap.hpp"
33 #include "memory/metaspaceShared.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "prims/jvmtiEnvBase.hpp"
36 #include "prims/jvmtiRedefineClasses.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "utilities/macros.hpp"
39 #if INCLUDE_JFR
40 #include "jfr/support/jfrKlassExtension.hpp"
41 #endif
42
43
44 // called during initial loading of a shared class
45 InstanceKlass* KlassFactory::check_shared_class_file_load_hook(
46 InstanceKlass* ik,
47 Symbol* class_name,
48 Handle class_loader,
49 Handle protection_domain,
50 const ClassFileStream *cfs,
51 TRAPS) {
52 #if INCLUDE_CDS && INCLUDE_JVMTI
53 assert(ik != NULL, "sanity");
54 assert(ik->is_shared(), "expecting a shared class");
55 if (JvmtiExport::should_post_class_file_load_hook()) {
56 assert(THREAD->is_Java_thread(), "must be JavaThread");
57
58 // Post the CFLH
59 JvmtiCachedClassFileData* cached_class_file = NULL;
60 if (cfs == NULL) {
61 cfs = FileMapInfo::open_stream_for_jvmti(ik, CHECK_NULL);
62 }
63 unsigned char* ptr = (unsigned char*)cfs->buffer();
64 unsigned char* end_ptr = ptr + cfs->length();
65 unsigned char* old_ptr = ptr;
66 JvmtiExport::post_class_file_load_hook(class_name,
67 class_loader,
68 protection_domain,
69 &ptr,
70 &end_ptr,
71 &cached_class_file);
72 if (old_ptr != ptr) {
73 // JVMTI agent has modified class file data.
74 // Set new class file stream using JVMTI agent modified class file data.
75 ClassLoaderData* loader_data =
76 ClassLoaderData::class_loader_data(class_loader());
77 int path_index = ik->shared_classpath_index();
78 ClassFileStream* stream = new ClassFileStream(ptr,
79 end_ptr - ptr,
80 cfs->source(),
81 ClassFileStream::verify);
82 ClassFileParser parser(stream,
83 class_name,
84 loader_data,
85 protection_domain,
86 NULL,
87 NULL,
88 ClassFileParser::BROADCAST, // publicity level
89 CHECK_NULL);
90 InstanceKlass* new_ik = parser.create_instance_klass(true /* changed_by_loadhook */,
91 CHECK_NULL);
92 if (cached_class_file != NULL) {
93 new_ik->set_cached_class_file(cached_class_file);
94 }
95
96 if (class_loader.is_null()) {
97 ResourceMark rm;
98 ClassLoader::add_package(class_name->as_C_string(), path_index, THREAD);
99 }
100
203 ClassFileParser::BROADCAST, // publicity level
204 CHECK_NULL);
205
206 InstanceKlass* result = parser.create_instance_klass(old_stream != stream, CHECK_NULL);
207 assert(result == parser.create_instance_klass(old_stream != stream, THREAD), "invariant");
208
209 if (result == NULL) {
210 return NULL;
211 }
212
213 if (cached_class_file != NULL) {
214 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
215 result->set_cached_class_file(cached_class_file);
216 }
217
218 JFR_ONLY(ON_KLASS_CREATION(result, parser, THREAD);)
219
220 #if INCLUDE_CDS
221 if (DumpSharedSpaces) {
222 ClassLoader::record_result(result, stream, THREAD);
223 }
224 #endif // INCLUDE_CDS
225
226 return result;
227 }
|