1 /*
2 * Copyright (c) 2016, 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 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "jfr/jni/jfrJavaSupport.hpp"
30 #include "jfr/jni/jfrUpcalls.hpp"
31 #include "jfr/recorder/access/jfrEventClass.hpp"
32 #include "logging/log.hpp"
33 #include "memory/oopFactory.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "oops/typeArrayKlass.hpp"
36 #include "oops/typeArrayOop.inline.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/os.hpp"
39 #include "runtime/thread.inline.hpp"
40 #include "utilities/exceptions.hpp"
41
42 static Symbol* jvm_upcalls_class_sym = NULL;
43 static Symbol* on_retransform_method_sym = NULL;
44 static Symbol* on_retransform_signature_sym = NULL;
45 static Symbol* bytes_for_eager_instrumentation_sym = NULL;
46 static Symbol* bytes_for_eager_instrumentation_sig_sym = NULL;
47
48 static bool initialize(TRAPS) {
49 static bool initialized = false;
50 if (!initialized) {
51 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
52 jvm_upcalls_class_sym = SymbolTable::new_permanent_symbol("jdk/jfr/internal/JVMUpcalls", CHECK_false);
53 on_retransform_method_sym = SymbolTable::new_permanent_symbol("onRetransform", CHECK_false);
54 on_retransform_signature_sym = SymbolTable::new_permanent_symbol("(JZLjava/lang/Class;[B)[B", CHECK_false);
55 bytes_for_eager_instrumentation_sym = SymbolTable::new_permanent_symbol("bytesForEagerInstrumentation", CHECK_false);
56 bytes_for_eager_instrumentation_sig_sym = SymbolTable::new_permanent_symbol("(JZLjava/lang/Class;[B)[B", THREAD);
57 initialized = bytes_for_eager_instrumentation_sig_sym != NULL;
58 }
59 return initialized;
60 }
61
62 static const typeArrayOop invoke(jlong trace_id,
63 jboolean force_instrumentation,
64 jclass class_being_redefined,
65 jint class_data_len,
66 const unsigned char* class_data,
67 Symbol* method_sym,
68 Symbol* signature_sym,
69 jint& new_bytes_length,
70 TRAPS) {
71 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
72 const Klass* klass = SystemDictionary::resolve_or_fail(jvm_upcalls_class_sym, true, CHECK_NULL);
73 assert(klass != NULL, "invariant");
74 typeArrayOop old_byte_array = oopFactory::new_byteArray(class_data_len, CHECK_NULL);
75 memcpy(old_byte_array->byte_at_addr(0), class_data, class_data_len);
76 JavaValue result(T_OBJECT);
77 JfrJavaArguments args(&result, klass, method_sym, signature_sym);
78 args.push_long(trace_id);
79 args.push_int(force_instrumentation);
80 args.push_jobject(class_being_redefined);
81 args.push_oop(old_byte_array);
82 JfrJavaSupport::call_static(&args, THREAD);
83 if (HAS_PENDING_EXCEPTION) {
84 log_error(jfr, system)("JfrUpcall failed");
85 return NULL;
86 }
87 // The result should be a [B
88 const oop res = (oop)result.get_jobject();
89 assert(res != NULL, "invariant");
90 assert(res->is_typeArray(), "invariant");
91 assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "invariant");
92 const typeArrayOop new_byte_array = typeArrayOop(res);
93 new_bytes_length = (jint)new_byte_array->length();
94 return new_byte_array;
95 }
96
97 static const size_t ERROR_MSG_BUFFER_SIZE = 256;
98 static void log_error_and_throw_oom(jint new_bytes_length, TRAPS) {
99 char error_buffer[ERROR_MSG_BUFFER_SIZE];
100 jio_snprintf(error_buffer, ERROR_MSG_BUFFER_SIZE,
101 "Thread local allocation (native) for " SIZE_FORMAT " bytes failed in JfrUpcalls", (size_t)new_bytes_length);
102 log_error(jfr, system)("%s", error_buffer);
103 JfrJavaSupport::throw_out_of_memory_error(error_buffer, CHECK);
104 }
105
106 void JfrUpcalls::on_retransform(jlong trace_id,
107 jclass class_being_redefined,
108 jint class_data_len,
109 const unsigned char* class_data,
110 jint* new_class_data_len,
111 unsigned char** new_class_data,
112 TRAPS) {
113 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
114 assert(class_being_redefined != NULL, "invariant");
115 assert(class_data != NULL, "invariant");
116 assert(new_class_data_len != NULL, "invariant");
117 assert(new_class_data != NULL, "invariant");
118 if (!JdkJfrEvent::is_visible(class_being_redefined)) {
119 return;
120 }
121 jint new_bytes_length = 0;
122 initialize(THREAD);
123 const typeArrayOop new_byte_array = invoke(trace_id,
124 false,
125 class_being_redefined,
126 class_data_len,
127 class_data,
128 on_retransform_method_sym,
129 on_retransform_signature_sym,
130 new_bytes_length,
131 CHECK);
132 assert(new_byte_array != NULL, "invariant");
133 assert(new_bytes_length > 0, "invariant");
134 // memory space must be malloced as mtInternal
135 // as it will be deallocated by JVMTI routines
136 unsigned char* const new_bytes = (unsigned char* const)os::malloc(new_bytes_length, mtInternal);
137 if (new_bytes == NULL) {
138 log_error_and_throw_oom(new_bytes_length, THREAD); // unwinds
139 }
140 assert(new_bytes != NULL, "invariant");
141 memcpy(new_bytes, new_byte_array->byte_at_addr(0), (size_t)new_bytes_length);
142 *new_class_data_len = new_bytes_length;
143 *new_class_data = new_bytes;
144 }
145
146 void JfrUpcalls::new_bytes_eager_instrumentation(jlong trace_id,
147 jboolean force_instrumentation,
148 jclass super,
149 jint class_data_len,
150 const unsigned char* class_data,
151 jint* new_class_data_len,
152 unsigned char** new_class_data,
153 TRAPS) {
154 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
155 assert(super != NULL, "invariant");
156 assert(class_data != NULL, "invariant");
157 assert(new_class_data_len != NULL, "invariant");
158 assert(new_class_data != NULL, "invariant");
159 jint new_bytes_length = 0;
160 initialize(THREAD);
161 const typeArrayOop new_byte_array = invoke(trace_id,
162 force_instrumentation,
163 super,
164 class_data_len,
165 class_data,
166 bytes_for_eager_instrumentation_sym,
167 bytes_for_eager_instrumentation_sig_sym,
168 new_bytes_length,
169 CHECK);
170 assert(new_byte_array != NULL, "invariant");
171 assert(new_bytes_length > 0, "invariant");
172 unsigned char* const new_bytes = NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(THREAD, unsigned char, new_bytes_length);
173 if (new_bytes == NULL) {
174 log_error_and_throw_oom(new_bytes_length, THREAD); // this unwinds
175 }
176 assert(new_bytes != NULL, "invariant");
177 memcpy(new_bytes, new_byte_array->byte_at_addr(0), (size_t)new_bytes_length);
178 *new_class_data_len = new_bytes_length;
179 *new_class_data = new_bytes;
180 }