1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18
19 #include <vector>
20
21 #include "android-base/logging.h"
22 #include "android-base/macros.h"
23 #include "jni.h"
24 #include "jvmti.h"
25
26 // Test infrastructure
27 #include "jvmti_helper.h"
28 #include "scoped_local_ref.h"
29 #include "test_env.h"
30
31 namespace art {
32 namespace Test2005PauseAllRedefineMultithreaded {
33
34 static constexpr jlong kRedefinedObjectTag = 0xDEADBEEF;
35
36 extern "C" JNIEXPORT void JNICALL
Java_art_Test2005_UpdateFieldValuesAndResumeThreads(JNIEnv * env,jclass klass ATTRIBUTE_UNUSED,jobjectArray threads_arr,jclass redefined_class,jobjectArray new_fields,jstring default_val)37 Java_art_Test2005_UpdateFieldValuesAndResumeThreads(JNIEnv* env,
38 jclass klass ATTRIBUTE_UNUSED,
39 jobjectArray threads_arr,
40 jclass redefined_class,
41 jobjectArray new_fields,
42 jstring default_val) {
43 std::vector<jthread> threads;
44 for (jint i = 0; i < env->GetArrayLength(threads_arr); i++) {
45 threads.push_back(env->GetObjectArrayElement(threads_arr, i));
46 }
47 std::vector<jfieldID> fields;
48 for (jint i = 0; i < env->GetArrayLength(new_fields); i++) {
49 fields.push_back(env->FromReflectedField(env->GetObjectArrayElement(new_fields, i)));
50 }
51 // Tag every instance of the redefined class with kRedefinedObjectTag
52 CHECK_EQ(jvmti_env->IterateOverInstancesOfClass(
53 redefined_class,
54 JVMTI_HEAP_OBJECT_EITHER,
55 [](jlong class_tag ATTRIBUTE_UNUSED,
56 jlong size ATTRIBUTE_UNUSED,
57 jlong* tag_ptr,
58 void* user_data ATTRIBUTE_UNUSED) -> jvmtiIterationControl {
59 *tag_ptr = kRedefinedObjectTag;
60 return JVMTI_ITERATION_CONTINUE;
61 },
62 nullptr),
63 JVMTI_ERROR_NONE);
64 jobject* objs;
65 jint cnt;
66 // Get the objects.
67 CHECK_EQ(jvmti_env->GetObjectsWithTags(1, &kRedefinedObjectTag, &cnt, &objs, nullptr),
68 JVMTI_ERROR_NONE);
69 // Set every field that's null
70 for (jint i = 0; i < cnt; i++) {
71 jobject obj = objs[i];
72 for (jfieldID field : fields) {
73 if (ScopedLocalRef<jobject>(env, env->GetObjectField(obj, field)).get() == nullptr) {
74 env->SetObjectField(obj, field, default_val);
75 }
76 }
77 }
78 LOG(INFO) << "Setting " << cnt << " objects with default values";
79 if (!threads.empty()) {
80 std::vector<jvmtiError> errs(threads.size(), JVMTI_ERROR_NONE);
81 CHECK_EQ(jvmti_env->ResumeThreadList(threads.size(), threads.data(), errs.data()),
82 JVMTI_ERROR_NONE);
83 }
84 jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(objs));
85 }
86
87 } // namespace Test2005PauseAllRedefineMultithreaded
88 } // namespace art
89