jni_table.cc revision 4665167ddc34008dfa78a2873685fe7a98772eab 
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
29namespace art {
30namespace Test927JNITable {
31
32// This test is equivalent to the jni_internal_test JNIEnvExtTableOverride.
33
34static size_t gGlobalRefCount = 0;
35static JNINativeInterface* gOriginalEnv = nullptr;
36
37static jobject CountNewGlobalRef(JNIEnv* env, jobject o) {
38  ++gGlobalRefCount;
39  return gOriginalEnv->NewGlobalRef(env, o);
40}
41
42extern "C" JNIEXPORT void JNICALL Java_art_Test928_doJNITableTest(
43    JNIEnv* env, jclass klass) {
44  // Get the current table, as the delegate.
45  jvmtiError getorig_result = jvmti_env->GetJNIFunctionTable(&gOriginalEnv);
46  if (JvmtiErrorToException(env, jvmti_env, getorig_result)) {
47    return;
48  }
49
50  // Get the current table, as the override we'll install.
51  JNINativeInterface* env_override;
52  jvmtiError getoverride_result = jvmti_env->GetJNIFunctionTable(&env_override);
53  if (JvmtiErrorToException(env, jvmti_env, getoverride_result)) {
54    return;
55  }
56
57  env_override->NewGlobalRef = CountNewGlobalRef;
58  gGlobalRefCount = 0;
59
60  // Install the override.
61  jvmtiError setoverride_result = jvmti_env->SetJNIFunctionTable(env_override);
62  if (JvmtiErrorToException(env, jvmti_env, setoverride_result)) {
63    return;
64  }
65
66  jobject global = env->NewGlobalRef(klass);
67  CHECK_EQ(1u, gGlobalRefCount);
68  env->DeleteGlobalRef(global);
69
70  // Install the "original." There is no real reset.
71  jvmtiError setoverride2_result = jvmti_env->SetJNIFunctionTable(gOriginalEnv);
72  if (JvmtiErrorToException(env, jvmti_env, setoverride2_result)) {
73    return;
74  }
75
76  jobject global2 = env->NewGlobalRef(klass);
77  CHECK_EQ(1u, gGlobalRefCount);
78  env->DeleteGlobalRef(global2);
79
80  // Try to install null. Should return NULL_POINTER error.
81  jvmtiError setoverride3_result = jvmti_env->SetJNIFunctionTable(nullptr);
82  if (setoverride3_result != JVMTI_ERROR_NULL_POINTER) {
83    LOG(FATAL) << "Didn't receive NULL_POINTER";
84  }
85
86  jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(env_override));
87}
88
89}  // namespace Test927JNITable
90}  // namespace art
91