109 lines
4.3 KiB
C++
109 lines
4.3 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <vector>
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#include "android-base/logging.h"
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#include "android-base/macros.h"
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#include "jni.h"
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#include "jvmti.h"
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// Test infrastructure
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#include "jvmti_helper.h"
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#include "scoped_local_ref.h"
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#include "test_env.h"
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namespace art {
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namespace Test2005PauseAllRedefineMultithreaded {
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static constexpr jlong kRedefinedObjectTag = 0xDEADBEEF;
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extern "C" JNIEXPORT void JNICALL
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Java_art_Test2005_UpdateFieldValuesAndResumeThreads(JNIEnv* env,
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jclass klass ATTRIBUTE_UNUSED,
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jobjectArray threads_arr,
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jclass redefined_class,
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jobjectArray new_fields,
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jstring default_val) {
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std::vector<jthread> threads;
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for (jint i = 0; i < env->GetArrayLength(threads_arr); i++) {
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threads.push_back(env->GetObjectArrayElement(threads_arr, i));
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}
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std::vector<jfieldID> fields;
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for (jint i = 0; i < env->GetArrayLength(new_fields); i++) {
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fields.push_back(env->FromReflectedField(env->GetObjectArrayElement(new_fields, i)));
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}
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// Tag every instance of the redefined class with kRedefinedObjectTag
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CHECK_EQ(jvmti_env->IterateOverInstancesOfClass(
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redefined_class,
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JVMTI_HEAP_OBJECT_EITHER,
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[](jlong class_tag ATTRIBUTE_UNUSED,
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jlong size ATTRIBUTE_UNUSED,
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jlong* tag_ptr,
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void* user_data ATTRIBUTE_UNUSED) -> jvmtiIterationControl {
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*tag_ptr = kRedefinedObjectTag;
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return JVMTI_ITERATION_CONTINUE;
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},
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nullptr),
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JVMTI_ERROR_NONE);
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jobject* objs;
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jint cnt;
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// Get the objects.
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CHECK_EQ(jvmti_env->GetObjectsWithTags(1, &kRedefinedObjectTag, &cnt, &objs, nullptr),
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JVMTI_ERROR_NONE);
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// Set every field that's null
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for (jint i = 0; i < cnt; i++) {
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jobject obj = objs[i];
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for (jfieldID field : fields) {
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if (ScopedLocalRef<jobject>(env, env->GetObjectField(obj, field)).get() == nullptr) {
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env->SetObjectField(obj, field, default_val);
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}
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}
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}
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LOG(INFO) << "Setting " << cnt << " objects with default values";
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if (!threads.empty()) {
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std::vector<jvmtiError> errs(threads.size(), JVMTI_ERROR_NONE);
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CHECK_EQ(jvmti_env->ResumeThreadList(threads.size(), threads.data(), errs.data()),
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JVMTI_ERROR_NONE);
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}
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jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(objs));
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}
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extern "C" JNIEXPORT jobject JNICALL
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Java_Main_fastNativeSleepAndReturnInteger42(JNIEnv* env, jclass klass ATTRIBUTE_UNUSED) {
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jclass integer_class = env->FindClass("java/lang/Integer");
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CHECK(integer_class != nullptr);
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jmethodID integer_value_of =
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env->GetStaticMethodID(integer_class, "valueOf", "(I)Ljava/lang/Integer;");
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CHECK(integer_value_of != nullptr);
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jobject value = env->CallStaticObjectMethod(integer_class, integer_value_of, 42);
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CHECK(value != nullptr);
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// Sleep for 500ms, blocking thread suspension (this method is @FastNative).
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// Except for some odd thread timing, this should ensure that the suspend
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// request from the redefinition thread is seen by the suspend check in the
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// JNI stub when we exit this function and then processed with the JNI stub
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// still on the stack. The instrumentation previously erroneously
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// intercepted returning to the JNI stub and the "instrumentation exit"
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// handler treated the return value `jobject` as `mirror::Object*`.
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usleep(500000);
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return value;
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}
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} // namespace Test2005PauseAllRedefineMultithreaded
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} // namespace art
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