116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
// 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 <android-base/logging.h>
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#include <jni.h>
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#include <jvmti.h>
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namespace dumpjvmti {
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namespace {
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// Special art ti-version number. We will use this as a fallback if we cannot get a regular JVMTI
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// env.
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static constexpr jint kArtTiVersion = JVMTI_VERSION_1_2 | 0x40000000;
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template <typename T> static void Dealloc(jvmtiEnv* env, T* t) {
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env->Deallocate(reinterpret_cast<unsigned char*>(t));
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}
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template <typename T, typename... Rest> static void Dealloc(jvmtiEnv* env, T* t, Rest... rs) {
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Dealloc(env, t);
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Dealloc(env, rs...);
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}
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static void DeallocParams(jvmtiEnv* env, jvmtiParamInfo* params, jint n_params) {
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for (jint i = 0; i < n_params; i++) {
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Dealloc(env, params[i].name);
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}
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}
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// The extension function to get the internal data
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static jvmtiError (*GetInternalData)(jvmtiEnv* env, unsigned char** data) = nullptr;
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static jint SetupJvmtiEnv(JavaVM* vm, jvmtiEnv** jvmti) {
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jint res = 0;
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res = vm->GetEnv(reinterpret_cast<void**>(jvmti), JVMTI_VERSION_1_1);
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if (res != JNI_OK || *jvmti == nullptr) {
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LOG(ERROR) << "Unable to access JVMTI, error code " << res;
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res = vm->GetEnv(reinterpret_cast<void**>(jvmti), kArtTiVersion);
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if (res != JNI_OK) {
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return res;
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}
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}
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jvmtiEnv* env = *jvmti;
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// Get the extensions.
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jint n_ext = 0;
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jvmtiExtensionFunctionInfo* infos = nullptr;
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if (env->GetExtensionFunctions(&n_ext, &infos) != JVMTI_ERROR_NONE) {
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return JNI_ERR;
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}
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for (jint i = 0; i < n_ext; i++) {
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jvmtiExtensionFunctionInfo* cur_info = &infos[i];
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if (strcmp("com.android.art.misc.get_plugin_internal_state", cur_info->id) == 0) {
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GetInternalData = reinterpret_cast<decltype(GetInternalData)>(cur_info->func);
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}
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// Cleanup the cur_info
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DeallocParams(env, cur_info->params, cur_info->param_count);
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Dealloc(env, cur_info->id, cur_info->short_description, cur_info->params, cur_info->errors);
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}
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// Cleanup the array.
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Dealloc(env, infos);
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return GetInternalData != nullptr ? JNI_OK : JNI_ERR;
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}
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static void CbDataDump(jvmtiEnv* jvmti) {
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unsigned char* data = nullptr;
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if (JVMTI_ERROR_NONE == GetInternalData(jvmti, &data)) {
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LOG(INFO) << data;
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Dealloc(jvmti, data);
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}
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}
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} // namespace
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static jint AgentStart(JavaVM* vm, char* options ATTRIBUTE_UNUSED, void* reserved ATTRIBUTE_UNUSED) {
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jvmtiEnv* jvmti = nullptr;
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if (SetupJvmtiEnv(vm, &jvmti) != JNI_OK) {
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LOG(ERROR) << "Could not get JVMTI env or ArtTiEnv!";
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return JNI_ERR;
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}
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jvmtiEventCallbacks cb{
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.DataDumpRequest = CbDataDump,
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};
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jvmti->SetEventCallbacks(&cb, sizeof(cb));
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jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_DATA_DUMP_REQUEST, nullptr);
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return JNI_OK;
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}
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// Late attachment (e.g. 'am attach-agent').
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extern "C" JNIEXPORT jint JNICALL Agent_OnAttach(JavaVM* vm, char* options, void* reserved) {
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return AgentStart(vm, options, reserved);
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}
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// Early attachment
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extern "C" JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM* jvm, char* options, void* reserved) {
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return AgentStart(jvm, options, reserved);
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}
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} // namespace dumpjvmti
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