1 /*
2 * Copyright (C) 2013 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 "jni.h"
20 #include "jvmti.h"
21
22 #include "android-base/logging.h"
23 #include "android-base/macros.h"
24
25 // Test infrastructure
26 #include "jvmti_helper.h"
27 #include "test_env.h"
28
29 namespace art {
30 namespace Test927JNITable {
31
32 // This test is equivalent to the jni_internal_test JNIEnvExtTableOverride.
33
34 static size_t gGlobalRefCount = 0;
35 static JNINativeInterface* gOriginalEnv = nullptr;
36
CountNewGlobalRef(JNIEnv * env,jobject o)37 static jobject CountNewGlobalRef(JNIEnv* env, jobject o) {
38 ++gGlobalRefCount;
39 return gOriginalEnv->NewGlobalRef(env, o);
40 }
41
DoDeleteGlobalRef(JNIEnv * env,jobject o)42 static void DoDeleteGlobalRef(JNIEnv* env, jobject o) {
43 jclass thr = env->FindClass("java/lang/Thread");
44 CHECK(thr != nullptr);
45 if (env->IsInstanceOf(o, thr)) {
46 jvmtiThreadInfo jti;
47 // b/146170834: This could cause DCHECK failures.
48 CHECK_EQ(jvmti_env->GetThreadInfo(reinterpret_cast<jthread>(o), &jti), JVMTI_ERROR_NONE);
49 }
50 gOriginalEnv->DeleteGlobalRef(env, o);
51 }
52
Java_art_Test928_doOtherThreadTest(JNIEnv * env,jclass klass)53 extern "C" JNIEXPORT void JNICALL Java_art_Test928_doOtherThreadTest(JNIEnv* env, jclass klass) {
54 size_t start_other_thread_count = gGlobalRefCount;
55 // Make sure it still works even on another thread.
56 jobject global = env->NewGlobalRef(klass);
57 CHECK_EQ(start_other_thread_count + 1, gGlobalRefCount);
58 env->DeleteGlobalRef(global);
59 }
60
Java_art_Test928_doJNITableTest(JNIEnv * env,jclass klass)61 extern "C" JNIEXPORT void JNICALL Java_art_Test928_doJNITableTest(
62 JNIEnv* env, jclass klass) {
63 // Get the current table, as the delegate.
64 jvmtiError getorig_result = jvmti_env->GetJNIFunctionTable(&gOriginalEnv);
65 if (JvmtiErrorToException(env, jvmti_env, getorig_result)) {
66 return;
67 }
68
69 // Get the current table, as the override we'll install.
70 JNINativeInterface* env_override;
71 jvmtiError getoverride_result = jvmti_env->GetJNIFunctionTable(&env_override);
72 if (JvmtiErrorToException(env, jvmti_env, getoverride_result)) {
73 return;
74 }
75
76 env_override->NewGlobalRef = CountNewGlobalRef;
77 env_override->DeleteGlobalRef = DoDeleteGlobalRef;
78 gGlobalRefCount = 0;
79
80 // Install the override.
81 jvmtiError setoverride_result = jvmti_env->SetJNIFunctionTable(env_override);
82 if (JvmtiErrorToException(env, jvmti_env, setoverride_result)) {
83 return;
84 }
85
86 jobject global = env->NewGlobalRef(klass);
87 CHECK_EQ(1u, gGlobalRefCount);
88 env->DeleteGlobalRef(global);
89
90 // Try and create and destroy a thread.
91 env->CallStaticVoidMethod(klass, env->GetStaticMethodID(klass, "runThreadTest", "()V"));
92 // Make sure something got ref'd, in the other thread we make and then clear a global ref so that
93 // should at least be present.
94 CHECK_LT(1u, gGlobalRefCount);
95
96 // Install the "original." There is no real reset.
97 size_t final_global_ref_count = gGlobalRefCount;
98 jvmtiError setoverride2_result = jvmti_env->SetJNIFunctionTable(gOriginalEnv);
99 if (JvmtiErrorToException(env, jvmti_env, setoverride2_result)) {
100 return;
101 }
102
103 jobject global2 = env->NewGlobalRef(klass);
104 CHECK_EQ(final_global_ref_count, gGlobalRefCount);
105 env->DeleteGlobalRef(global2);
106
107 // Try to install null. Should return NULL_POINTER error.
108 jvmtiError setoverride3_result = jvmti_env->SetJNIFunctionTable(nullptr);
109 if (setoverride3_result != JVMTI_ERROR_NULL_POINTER) {
110 LOG(FATAL) << "Didn't receive NULL_POINTER";
111 }
112
113 jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(env_override));
114 }
115
116 } // namespace Test927JNITable
117 } // namespace art
118