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      1 /*
      2  * Copyright (C) 2017 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 "jni.h"
     18 
     19 #include "android-base/logging.h"
     20 #include "android-base/macros.h"
     21 #include "jni_helper.h"
     22 #include "jvmti_helper.h"
     23 #include "jvmti.h"
     24 #include "scoped_primitive_array.h"
     25 #include "test_env.h"
     26 
     27 namespace art {
     28 
     29 extern "C" JNIEXPORT void JNICALL Java_android_jvmti_cts_JniBindings_setTag(
     30     JNIEnv* env, jclass klass ATTRIBUTE_UNUSED, jobject obj, jlong tag) {
     31   jvmtiError ret = jvmti_env->SetTag(obj, tag);
     32   JvmtiErrorToException(env, jvmti_env, ret);
     33 }
     34 
     35 extern "C" JNIEXPORT jlong JNICALL Java_android_jvmti_cts_JniBindings_getTag(
     36     JNIEnv* env, jclass klass ATTRIBUTE_UNUSED, jobject obj) {
     37   jlong tag = 0;
     38   jvmtiError ret = jvmti_env->GetTag(obj, &tag);
     39   if (JvmtiErrorToException(env, jvmti_env, ret)) {
     40     return 0;
     41   }
     42   return tag;
     43 }
     44 
     45 extern "C" JNIEXPORT jobjectArray JNICALL Java_android_jvmti_cts_JvmtiTaggingTest_getTaggedObjects(
     46     JNIEnv* env,
     47     jclass klass ATTRIBUTE_UNUSED,
     48     jlongArray searchTags,
     49     jboolean returnObjects,
     50     jboolean returnTags) {
     51   ScopedLongArrayRO scoped_array(env);
     52   if (searchTags != nullptr) {
     53     scoped_array.reset(searchTags);
     54   }
     55   const jlong* tag_ptr = scoped_array.get();
     56   if (tag_ptr == nullptr) {
     57     // Can never pass null.
     58     tag_ptr = reinterpret_cast<const jlong*>(1);
     59   }
     60 
     61   jint result_count = -1;
     62   jobject* result_object_array = nullptr;
     63   jobject** result_object_array_ptr = returnObjects == JNI_TRUE ? &result_object_array : nullptr;
     64   jlong* result_tag_array = nullptr;
     65   jlong** result_tag_array_ptr = returnTags == JNI_TRUE ? &result_tag_array : nullptr;
     66 
     67   jvmtiError ret = jvmti_env->GetObjectsWithTags(scoped_array.size(),
     68                                                  tag_ptr,
     69                                                  &result_count,
     70                                                  result_object_array_ptr,
     71                                                  result_tag_array_ptr);
     72   if (JvmtiErrorToException(env, jvmti_env, ret)) {
     73     return nullptr;
     74   }
     75 
     76   CHECK_GE(result_count, 0);
     77 
     78   jobjectArray resultObjectArray = nullptr;
     79   if (returnObjects == JNI_TRUE) {
     80     auto callback = [&](jint i) {
     81       return result_object_array[i];
     82     };
     83     resultObjectArray = CreateObjectArray(env, result_count, "java/lang/Object", callback);
     84     if (resultObjectArray == nullptr) {
     85       return nullptr;
     86     }
     87   }
     88   if (result_object_array != nullptr) {
     89     CheckJvmtiError(jvmti_env, Deallocate(jvmti_env, result_object_array));
     90   }
     91 
     92   jlongArray resultTagArray = nullptr;
     93   if (returnTags == JNI_TRUE) {
     94     resultTagArray = env->NewLongArray(result_count);
     95     if (resultTagArray == nullptr) {
     96       return nullptr;
     97     }
     98     env->SetLongArrayRegion(resultTagArray, 0, result_count, result_tag_array);
     99   }
    100   if (result_tag_array != nullptr) {
    101     CheckJvmtiError(jvmti_env, Deallocate(jvmti_env, result_tag_array));
    102   }
    103 
    104   jobject count_integer;
    105   {
    106     ScopedLocalRef<jclass> integer_class(env, env->FindClass("java/lang/Integer"));
    107     jmethodID methodID = env->GetMethodID(integer_class.get(), "<init>", "(I)V");
    108     count_integer = env->NewObject(integer_class.get(), methodID, result_count);
    109     if (count_integer == nullptr) {
    110       return nullptr;
    111     }
    112   }
    113 
    114   auto callback = [&](jint i) -> jobject {
    115     switch(i) {
    116       case 0:
    117         return resultObjectArray;
    118       case 1:
    119         return resultTagArray;
    120       case 2:
    121         return count_integer;
    122       default:
    123         LOG(FATAL) << "Unexpected";
    124         return nullptr;
    125     }
    126   };
    127   return CreateObjectArray(env, 3, "java/lang/Object", callback);
    128 }
    129 
    130 }  // namespace art
    131 
    132