| /* Copyright (C) 2017 The Android Open Source Project |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This file implements interfaces from the file jvmti.h. This implementation |
| * is licensed under the same terms as the file jvmti.h. The |
| * copyright and license information for the file jvmti.h follows. |
| * |
| * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include <vector> |
| |
| #include "jvmti.h" |
| #include "ti_extension.h" |
| |
| #include "art_jvmti.h" |
| #include "events.h" |
| #include "jni_id_type.h" |
| #include "runtime-inl.h" |
| #include "ti_allocator.h" |
| #include "ti_class.h" |
| #include "ti_ddms.h" |
| #include "ti_dump.h" |
| #include "ti_heap.h" |
| #include "ti_logging.h" |
| #include "ti_monitor.h" |
| #include "ti_redefine.h" |
| #include "ti_search.h" |
| #include "transform.h" |
| |
| #include "thread-inl.h" |
| |
| namespace openjdkjvmti { |
| |
| struct CParamInfo { |
| const char* name; |
| jvmtiParamKind kind; |
| jvmtiParamTypes base_type; |
| jboolean null_ok; |
| |
| jvmtiParamInfo ToParamInfo(jvmtiEnv* env, |
| /*out*/std::vector<JvmtiUniquePtr<char[]>>* char_buffers, |
| /*out*/jvmtiError* err) const { |
| JvmtiUniquePtr<char[]> param_name = CopyString(env, name, err); |
| char* name_ptr = param_name.get(); |
| char_buffers->push_back(std::move(param_name)); |
| return jvmtiParamInfo{ name_ptr, kind, base_type, null_ok }; |
| } |
| }; |
| |
| jvmtiError ExtensionUtil::GetExtensionFunctions(jvmtiEnv* env, |
| jint* extension_count_ptr, |
| jvmtiExtensionFunctionInfo** extensions) { |
| if (extension_count_ptr == nullptr || extensions == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| std::vector<jvmtiExtensionFunctionInfo> ext_vector; |
| |
| // Holders for allocated values. |
| std::vector<JvmtiUniquePtr<char[]>> char_buffers; |
| std::vector<JvmtiUniquePtr<jvmtiParamInfo[]>> param_buffers; |
| std::vector<JvmtiUniquePtr<jvmtiError[]>> error_buffers; |
| |
| auto add_extension = [&](jvmtiExtensionFunction func, |
| const char* id, |
| const char* short_description, |
| const std::vector<CParamInfo>& params, |
| const std::vector<jvmtiError>& errors) { |
| jvmtiExtensionFunctionInfo func_info; |
| jvmtiError error; |
| |
| func_info.func = func; |
| |
| JvmtiUniquePtr<char[]> id_ptr = CopyString(env, id, &error); |
| if (id_ptr == nullptr) { |
| return error; |
| } |
| func_info.id = id_ptr.get(); |
| char_buffers.push_back(std::move(id_ptr)); |
| |
| JvmtiUniquePtr<char[]> descr = CopyString(env, short_description, &error); |
| if (descr == nullptr) { |
| return error; |
| } |
| func_info.short_description = descr.get(); |
| char_buffers.push_back(std::move(descr)); |
| |
| func_info.param_count = params.size(); |
| if (!params.empty()) { |
| JvmtiUniquePtr<jvmtiParamInfo[]> params_ptr = |
| AllocJvmtiUniquePtr<jvmtiParamInfo[]>(env, params.size(), &error); |
| if (params_ptr == nullptr) { |
| return error; |
| } |
| func_info.params = params_ptr.get(); |
| param_buffers.push_back(std::move(params_ptr)); |
| |
| for (jint i = 0; i != func_info.param_count; ++i) { |
| func_info.params[i] = params[i].ToParamInfo(env, &char_buffers, &error); |
| if (error != OK) { |
| return error; |
| } |
| } |
| } else { |
| func_info.params = nullptr; |
| } |
| |
| func_info.error_count = errors.size(); |
| if (!errors.empty()) { |
| JvmtiUniquePtr<jvmtiError[]> errors_ptr = |
| AllocJvmtiUniquePtr<jvmtiError[]>(env, errors.size(), &error); |
| if (errors_ptr == nullptr) { |
| return error; |
| } |
| func_info.errors = errors_ptr.get(); |
| error_buffers.push_back(std::move(errors_ptr)); |
| |
| for (jint i = 0; i != func_info.error_count; ++i) { |
| func_info.errors[i] = errors[i]; |
| } |
| } else { |
| func_info.errors = nullptr; |
| } |
| |
| ext_vector.push_back(func_info); |
| |
| return ERR(NONE); |
| }; |
| |
| jvmtiError error; |
| |
| // Heap extensions. |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(HeapExtensions::GetObjectHeapId), |
| "com.android.art.heap.get_object_heap_id", |
| "Retrieve the heap id of the the object tagged with the given argument. An " |
| "arbitrary object is chosen if multiple objects exist with the same tag.", |
| { |
| { "tag", JVMTI_KIND_IN, JVMTI_TYPE_JLONG, false}, |
| { "heap_id", JVMTI_KIND_OUT, JVMTI_TYPE_JINT, false} |
| }, |
| { JVMTI_ERROR_NOT_FOUND }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(HeapExtensions::GetHeapName), |
| "com.android.art.heap.get_heap_name", |
| "Retrieve the name of the heap with the given id.", |
| { |
| { "heap_id", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false}, |
| { "heap_name", JVMTI_KIND_ALLOC_BUF, JVMTI_TYPE_CCHAR, false} |
| }, |
| { JVMTI_ERROR_ILLEGAL_ARGUMENT }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(HeapExtensions::IterateThroughHeapExt), |
| "com.android.art.heap.iterate_through_heap_ext", |
| "Iterate through a heap. This is equivalent to the standard IterateThroughHeap function," |
| " except for additionally passing the heap id of the current object. The jvmtiHeapCallbacks" |
| " structure is reused, with the callbacks field overloaded to a signature of " |
| "jint (*)(jlong, jlong, jlong*, jint length, void*, jint).", |
| { |
| { "heap_filter", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false}, |
| { "klass", JVMTI_KIND_IN, JVMTI_TYPE_JCLASS, true}, |
| { "callbacks", JVMTI_KIND_IN_PTR, JVMTI_TYPE_CVOID, false}, |
| { "user_data", JVMTI_KIND_IN_PTR, JVMTI_TYPE_CVOID, true} |
| }, |
| { |
| ERR(MUST_POSSESS_CAPABILITY), |
| ERR(INVALID_CLASS), |
| ERR(NULL_POINTER), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(AllocUtil::GetGlobalJvmtiAllocationState), |
| "com.android.art.alloc.get_global_jvmti_allocation_state", |
| "Returns the total amount of memory currently allocated by all jvmtiEnvs through the" |
| " 'Allocate' jvmti function. This does not include any memory that has been deallocated" |
| " through the 'Deallocate' function. This number is approximate and might not correspond" |
| " exactly to the sum of the sizes of all not freed allocations.", |
| { |
| { "currently_allocated", JVMTI_KIND_OUT, JVMTI_TYPE_JLONG, false}, |
| }, |
| { ERR(NULL_POINTER) }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // DDMS extension |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(DDMSUtil::HandleChunk), |
| "com.android.art.internal.ddm.process_chunk", |
| "Handles a single ddms chunk request and returns a response. The reply data is in the ddms" |
| " chunk format. It returns the processed chunk. This is provided for backwards compatibility" |
| " reasons only. Agents should avoid making use of this extension when possible and instead" |
| " use the other JVMTI entrypoints explicitly.", |
| { |
| { "type_in", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| { "length_in", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| { "data_in", JVMTI_KIND_IN_BUF, JVMTI_TYPE_JBYTE, true }, |
| { "type_out", JVMTI_KIND_OUT, JVMTI_TYPE_JINT, false }, |
| { "data_len_out", JVMTI_KIND_OUT, JVMTI_TYPE_JINT, false }, |
| { "data_out", JVMTI_KIND_ALLOC_BUF, JVMTI_TYPE_JBYTE, false } |
| }, |
| { ERR(NULL_POINTER), ERR(ILLEGAL_ARGUMENT), ERR(OUT_OF_MEMORY) }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // GetClassLoaderClassDescriptors extension |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(ClassUtil::GetClassLoaderClassDescriptors), |
| "com.android.art.class.get_class_loader_class_descriptors", |
| "Retrieves a list of all the classes (as class descriptors) that the given class loader is" |
| " capable of being the defining class loader for. The return format is a list of" |
| " null-terminated descriptor strings of the form \"L/java/lang/Object;\". Each descriptor" |
| " will be in the list at most once. If the class_loader is null the bootclassloader will be" |
| " used. If the class_loader is not null it must either be a java.lang.BootClassLoader, a" |
| " dalvik.system.BaseDexClassLoader or a derived type. The data_out list and all elements" |
| " must be deallocated by the caller.", |
| { |
| { "class_loader", JVMTI_KIND_IN, JVMTI_TYPE_JOBJECT, true }, |
| { "class_descriptor_count_out", JVMTI_KIND_OUT, JVMTI_TYPE_JINT, false }, |
| { "data_out", JVMTI_KIND_ALLOC_ALLOC_BUF, JVMTI_TYPE_CCHAR, false }, |
| }, |
| { |
| ERR(NULL_POINTER), |
| ERR(ILLEGAL_ARGUMENT), |
| ERR(OUT_OF_MEMORY), |
| ERR(NOT_IMPLEMENTED), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // Raw monitors no suspend |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(MonitorUtil::RawMonitorEnterNoSuspend), |
| "com.android.art.concurrent.raw_monitor_enter_no_suspend", |
| "Normally entering a monitor will not return until both the monitor is locked and the" |
| " current thread is not suspended. This method will return once the monitor is locked" |
| " even if the thread is suspended. Note that using rawMonitorWait will wait until the" |
| " thread is not suspended again on wakeup and so should be avoided.", |
| { |
| { "raw_monitor", JVMTI_KIND_IN_PTR, JVMTI_TYPE_CVOID, false }, |
| }, |
| { |
| ERR(NULL_POINTER), |
| ERR(INVALID_MONITOR), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // GetLastError extension |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(LogUtil::GetLastError), |
| "com.android.art.misc.get_last_error_message", |
| "In some cases the jvmti plugin will log data about errors to the android logcat. These can" |
| " be useful to tools so we make (some) of the messages available here as well. This will" |
| " fill the given 'msg' buffer with the last non-fatal message associated with this" |
| " jvmti-env. Note this is best-effort only, not all log messages will be accessible through" |
| " this API. This will return the last error-message from all threads. Care should be taken" |
| " interpreting the return value when used with a multi-threaded program. The error message" |
| " will only be cleared by a call to 'com.android.art.misc.clear_last_error_message' and will" |
| " not be cleared by intervening successful calls. If no (tracked) error message has been" |
| " sent since the last call to clear_last_error_message this API will return" |
| " JVMTI_ERROR_ABSENT_INFORMATION. Not all failures will cause an error message to be" |
| " recorded.", |
| { |
| { "msg", JVMTI_KIND_ALLOC_BUF, JVMTI_TYPE_CCHAR, false }, |
| }, |
| { |
| ERR(NULL_POINTER), |
| ERR(ABSENT_INFORMATION), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // ClearLastError extension |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(LogUtil::ClearLastError), |
| "com.android.art.misc.clear_last_error_message", |
| "Clears the error message returned by 'com.android.art.misc.get_last_error_message'.", |
| { }, |
| { }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // DumpInternalState |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(DumpUtil::DumpInternalState), |
| "com.android.art.misc.get_plugin_internal_state", |
| "Gets internal state about the plugin and serializes it to the given msg. " |
| "There is no particular format to this message beyond being human readable.", |
| { |
| { "msg", JVMTI_KIND_ALLOC_BUF, JVMTI_TYPE_CCHAR, false }, |
| }, |
| { ERR(NULL_POINTER) }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // AddToDexClassLoader |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(SearchUtil::AddToDexClassLoader), |
| "com.android.art.classloader.add_to_dex_class_loader", |
| "Adds a dexfile to a given dalvik.system.BaseDexClassLoader in a manner similar to" |
| " AddToSystemClassLoader.", |
| { |
| { "classloader", JVMTI_KIND_IN, JVMTI_TYPE_JOBJECT, false }, |
| { "segment", JVMTI_KIND_IN_PTR, JVMTI_TYPE_CCHAR, false }, |
| }, |
| { |
| ERR(NULL_POINTER), |
| ERR(CLASS_LOADER_UNSUPPORTED), |
| ERR(ILLEGAL_ARGUMENT), |
| ERR(WRONG_PHASE), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // AddToDexClassLoaderInMemory |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(SearchUtil::AddToDexClassLoaderInMemory), |
| "com.android.art.classloader.add_to_dex_class_loader_in_memory", |
| "Adds a dexfile buffer to a given dalvik.system.BaseDexClassLoader in a manner similar to" |
| " AddToSystemClassLoader. This may only be done during the LIVE phase. The buffer is copied" |
| " and the caller is responsible for deallocating it after this call.", |
| { |
| { "classloader", JVMTI_KIND_IN, JVMTI_TYPE_JOBJECT, false }, |
| { "dex_bytes", JVMTI_KIND_IN_BUF, JVMTI_TYPE_CCHAR, false }, |
| { "dex_bytes_len", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| }, |
| { |
| ERR(NULL_POINTER), |
| ERR(CLASS_LOADER_UNSUPPORTED), |
| ERR(ILLEGAL_ARGUMENT), |
| ERR(WRONG_PHASE), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // ChangeArraySize |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(HeapExtensions::ChangeArraySize), |
| "com.android.art.heap.change_array_size", |
| "Changes the size of a java array. As far as all JNI and java code is concerned this is" |
| " atomic. Must have can_tag_objects capability. If the new length of the array is smaller" |
| " than the original length, then the array will be truncated to the new length. Otherwise," |
| " all new slots will be filled with null, 0, or False as appropriate for the array type.", |
| { |
| { "array", JVMTI_KIND_IN, JVMTI_TYPE_JOBJECT, false }, |
| { "new_size", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| }, |
| { |
| ERR(NULL_POINTER), |
| ERR(MUST_POSSESS_CAPABILITY), |
| ERR(ILLEGAL_ARGUMENT), |
| ERR(OUT_OF_MEMORY), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // These require index-ids and debuggable to function |
| art::Runtime* runtime = art::Runtime::Current(); |
| if (runtime->GetJniIdType() == art::JniIdType::kIndices && |
| (runtime->GetInstrumentation()->IsForcedInterpretOnly() || runtime->IsJavaDebuggable())) { |
| // IsStructurallyModifiableClass |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(Redefiner::IsStructurallyModifiableClass), |
| "com.android.art.class.is_structurally_modifiable_class", |
| "Returns whether a class can potentially be 'structurally' redefined using the various" |
| " structural redefinition extensions provided.", |
| { |
| { "klass", JVMTI_KIND_IN, JVMTI_TYPE_JCLASS, false }, |
| { "result", JVMTI_KIND_OUT, JVMTI_TYPE_JBOOLEAN, false }, |
| }, |
| { |
| ERR(INVALID_CLASS), |
| ERR(NULL_POINTER), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // StructurallyRedefineClasses |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(Redefiner::StructurallyRedefineClasses), |
| "com.android.art.class.structurally_redefine_classes", |
| "Entrypoint for structural class redefinition. Has the same signature as RedefineClasses." |
| " Currently does not support redefining a class and any of its supertypes at the same time." |
| " Only supports additive changes, methods and fields may not be removed. Supertypes and" |
| " implemented interfaces may not be changed. After calling this" |
| " com.android.art.structural_dex_file_load_hook events will be triggered, followed by" |
| " re-transformable ClassFileLoadHook events. After this method completes subsequent" |
| " RetransformClasses calls will use the input to this function as the initial class" |
| " definition.", |
| { |
| { "num_classes", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| { "class_definitions", JVMTI_KIND_IN_BUF, JVMTI_TYPE_CVOID, false }, |
| }, |
| { |
| ERR(CLASS_LOADER_UNSUPPORTED), |
| ERR(FAILS_VERIFICATION), |
| ERR(ILLEGAL_ARGUMENT), |
| ERR(INVALID_CLASS), |
| ERR(MUST_POSSESS_CAPABILITY), |
| ERR(MUST_POSSESS_CAPABILITY), |
| ERR(NULL_POINTER), |
| ERR(OUT_OF_MEMORY), |
| ERR(UNMODIFIABLE_CLASS), |
| ERR(UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED), |
| ERR(UNSUPPORTED_REDEFINITION_METHOD_ADDED), |
| ERR(UNSUPPORTED_REDEFINITION_METHOD_DELETED), |
| ERR(UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| |
| // StructurallyRedefineClassDirect |
| error = add_extension( |
| reinterpret_cast<jvmtiExtensionFunction>(Redefiner::StructurallyRedefineClassDirect), |
| "com.android.art.UNSAFE.class.structurally_redefine_class_direct", |
| "Temporary prototype entrypoint for redefining a single class structurally. Currently this" |
| " only supports adding new static fields to a class without any instances." |
| " ClassFileLoadHook events will NOT be triggered. This does not currently support creating" |
| " obsolete methods. This function only has rudimentary error checking. This should not be" |
| " used except for testing.", |
| { |
| { "klass", JVMTI_KIND_IN, JVMTI_TYPE_JCLASS, false }, |
| { "new_def", JVMTI_KIND_IN_BUF, JVMTI_TYPE_CCHAR, false }, |
| { "new_def_len", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| }, |
| { |
| ERR(CLASS_LOADER_UNSUPPORTED), |
| ERR(FAILS_VERIFICATION), |
| ERR(ILLEGAL_ARGUMENT), |
| ERR(INVALID_CLASS), |
| ERR(MUST_POSSESS_CAPABILITY), |
| ERR(MUST_POSSESS_CAPABILITY), |
| ERR(NULL_POINTER), |
| ERR(OUT_OF_MEMORY), |
| ERR(UNMODIFIABLE_CLASS), |
| ERR(UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED), |
| ERR(UNSUPPORTED_REDEFINITION_METHOD_ADDED), |
| ERR(UNSUPPORTED_REDEFINITION_METHOD_DELETED), |
| ERR(UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED), |
| }); |
| if (error != ERR(NONE)) { |
| return error; |
| } |
| } else { |
| LOG(INFO) << "debuggable & jni-type indices are required to implement structural " |
| << "class redefinition extensions."; |
| } |
| |
| // Copy into output buffer. |
| |
| *extension_count_ptr = ext_vector.size(); |
| JvmtiUniquePtr<jvmtiExtensionFunctionInfo[]> out_data = |
| AllocJvmtiUniquePtr<jvmtiExtensionFunctionInfo[]>(env, ext_vector.size(), &error); |
| if (out_data == nullptr) { |
| return error; |
| } |
| memcpy(out_data.get(), |
| ext_vector.data(), |
| ext_vector.size() * sizeof(jvmtiExtensionFunctionInfo)); |
| *extensions = out_data.release(); |
| |
| // Release all the buffer holders, we're OK now. |
| for (auto& holder : char_buffers) { |
| holder.release(); |
| } |
| for (auto& holder : param_buffers) { |
| holder.release(); |
| } |
| for (auto& holder : error_buffers) { |
| holder.release(); |
| } |
| |
| return OK; |
| } |
| |
| |
| jvmtiError ExtensionUtil::GetExtensionEvents(jvmtiEnv* env, |
| jint* extension_count_ptr, |
| jvmtiExtensionEventInfo** extensions) { |
| std::vector<jvmtiExtensionEventInfo> ext_vector; |
| |
| // Holders for allocated values. |
| std::vector<JvmtiUniquePtr<char[]>> char_buffers; |
| std::vector<JvmtiUniquePtr<jvmtiParamInfo[]>> param_buffers; |
| |
| auto add_extension = [&](ArtJvmtiEvent extension_event_index, |
| const char* id, |
| const char* short_description, |
| const std::vector<CParamInfo>& params) { |
| DCHECK(IsExtensionEvent(extension_event_index)) << static_cast<jint>(extension_event_index); |
| jvmtiExtensionEventInfo event_info; |
| jvmtiError error; |
| |
| event_info.extension_event_index = static_cast<jint>(extension_event_index); |
| |
| JvmtiUniquePtr<char[]> id_ptr = CopyString(env, id, &error); |
| if (id_ptr == nullptr) { |
| return error; |
| } |
| event_info.id = id_ptr.get(); |
| char_buffers.push_back(std::move(id_ptr)); |
| |
| JvmtiUniquePtr<char[]> descr = CopyString(env, short_description, &error); |
| if (descr == nullptr) { |
| return error; |
| } |
| event_info.short_description = descr.get(); |
| char_buffers.push_back(std::move(descr)); |
| |
| event_info.param_count = params.size(); |
| if (!params.empty()) { |
| JvmtiUniquePtr<jvmtiParamInfo[]> params_ptr = |
| AllocJvmtiUniquePtr<jvmtiParamInfo[]>(env, params.size(), &error); |
| if (params_ptr == nullptr) { |
| return error; |
| } |
| event_info.params = params_ptr.get(); |
| param_buffers.push_back(std::move(params_ptr)); |
| |
| for (jint i = 0; i != event_info.param_count; ++i) { |
| event_info.params[i] = params[i].ToParamInfo(env, &char_buffers, &error); |
| if (error != OK) { |
| return error; |
| } |
| } |
| } else { |
| event_info.params = nullptr; |
| } |
| |
| ext_vector.push_back(event_info); |
| |
| return ERR(NONE); |
| }; |
| |
| jvmtiError error; |
| error = add_extension( |
| ArtJvmtiEvent::kDdmPublishChunk, |
| "com.android.art.internal.ddm.publish_chunk", |
| "Called when there is new ddms information that the agent or other clients can use. The" |
| " agent is given the 'type' of the ddms chunk and a 'data_size' byte-buffer in 'data'." |
| " The 'data' pointer is only valid for the duration of the publish_chunk event. The agent" |
| " is responsible for interpreting the information present in the 'data' buffer. This is" |
| " provided for backwards-compatibility support only. Agents should prefer to use relevant" |
| " JVMTI events and functions above listening for this event.", |
| { |
| { "jni_env", JVMTI_KIND_IN_PTR, JVMTI_TYPE_JNIENV, false }, |
| { "type", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| { "data_size", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| { "data", JVMTI_KIND_IN_BUF, JVMTI_TYPE_JBYTE, false }, |
| }); |
| if (error != OK) { |
| return error; |
| } |
| error = add_extension( |
| ArtJvmtiEvent::kObsoleteObjectCreated, |
| "com.android.art.heap.obsolete_object_created", |
| "Called when an obsolete object is created.\n" |
| "An object becomes obsolete when, due to some jvmti function call all references to the" |
| " object are replaced with a reference to a different object. After this call finishes there" |
| " will be no strong references to the obsolete object anywere. If the object is retrieved" |
| " using GetObjectsWithTags its type (class) may have changed and any data it contains may" |
| " have been deleted. This is primarily designed to support memory tracking agents which make" |
| " use of the ObjectFree and VMObjectAlloc events for tracking. To support this use-case if" |
| " this event is not being handled it will by default act as though the following code was" |
| " registered as a handler:\n" |
| "\n" |
| " void HandleObsoleteObjectCreated(jvmtiEnv* env, jlong* obsolete_tag, jlong* new_tag) {\n" |
| " jlong temp = *obsolete_tag;\n" |
| " *obsolete_tag = *new_tag;\n" |
| " *new_tag = temp;\n" |
| " }\n" |
| "\n" |
| "Note that this event does not support filtering based on thread. This event has the same" |
| " restrictions on JNI and JVMTI function calls as the ObjectFree event.\n" |
| "\n" |
| "Arguments:\n" |
| " obsolete_tag: Pointer to the tag the old object (now obsolete) has. Setting the pointer" |
| " will update the tag value.\n" |
| " new_tag: Pointer to the tag the new object (replacing the obsolete one) has. Setting the" |
| " pointer will update the tag value.", |
| { |
| { "obsolete_tag", JVMTI_KIND_IN_PTR, JVMTI_TYPE_JLONG, false }, |
| { "new_tag", JVMTI_KIND_IN_PTR, JVMTI_TYPE_JLONG, false }, |
| }); |
| if (error != OK) { |
| return error; |
| } |
| art::Runtime* runtime = art::Runtime::Current(); |
| if (runtime->GetJniIdType() == art::JniIdType::kIndices && |
| (runtime->GetInstrumentation()->IsForcedInterpretOnly() || runtime->IsJavaDebuggable())) { |
| error = add_extension( |
| ArtJvmtiEvent::kStructuralDexFileLoadHook, |
| "com.android.art.class.structural_dex_file_load_hook", |
| "Called during class load, after a 'RetransformClasses' call, or after a 'RedefineClasses'" |
| " call in order to allow the agent to modify the class. This event is called after any" |
| " non-can_retransform_classes ClassFileLoadHookEvents and before any" |
| " can_retransform_classes ClassFileLoadHookEvents. The transformations applied are" |
| " restricted in the same way that transformations applied via the " |
| " 'com.android.art.class.structurally_redefine_classes' extension function. The arguments" |
| " to the event are identical to the ones in the ClassFileLoadHook and have the same" |
| " semantics.", |
| { |
| { "jni_env", JVMTI_KIND_IN, JVMTI_TYPE_JNIENV, false }, |
| { "class_being_redefined", JVMTI_KIND_IN, JVMTI_TYPE_JCLASS, true }, |
| { "loader", JVMTI_KIND_IN, JVMTI_TYPE_JOBJECT, false }, |
| { "name", JVMTI_KIND_IN_PTR, JVMTI_TYPE_CCHAR, false }, |
| { "protection_domain", JVMTI_KIND_IN, JVMTI_TYPE_JOBJECT, true }, |
| { "dex_data_len", JVMTI_KIND_IN, JVMTI_TYPE_JINT, false }, |
| { "dex_data", JVMTI_KIND_IN_BUF, JVMTI_TYPE_CCHAR, false }, |
| { "new_dex_data_len", JVMTI_KIND_OUT, JVMTI_TYPE_JINT, false }, |
| { "new_dex_data", JVMTI_KIND_ALLOC_BUF, JVMTI_TYPE_CCHAR, true }, |
| }); |
| } else { |
| LOG(INFO) << "debuggable & jni-type indices are required to implement structural " |
| << "class redefinition extensions."; |
| } |
| // Copy into output buffer. |
| |
| *extension_count_ptr = ext_vector.size(); |
| JvmtiUniquePtr<jvmtiExtensionEventInfo[]> out_data = |
| AllocJvmtiUniquePtr<jvmtiExtensionEventInfo[]>(env, ext_vector.size(), &error); |
| if (out_data == nullptr) { |
| return error; |
| } |
| memcpy(out_data.get(), |
| ext_vector.data(), |
| ext_vector.size() * sizeof(jvmtiExtensionEventInfo)); |
| *extensions = out_data.release(); |
| |
| // Release all the buffer holders, we're OK now. |
| for (auto& holder : char_buffers) { |
| holder.release(); |
| } |
| for (auto& holder : param_buffers) { |
| holder.release(); |
| } |
| |
| return OK; |
| } |
| |
| jvmtiError ExtensionUtil::SetExtensionEventCallback(jvmtiEnv* env, |
| jint extension_event_index, |
| jvmtiExtensionEvent callback, |
| EventHandler* event_handler) { |
| if (!IsExtensionEvent(extension_event_index)) { |
| return ERR(ILLEGAL_ARGUMENT); |
| } |
| ArtJvmTiEnv* art_env = ArtJvmTiEnv::AsArtJvmTiEnv(env); |
| jvmtiEventMode mode = callback == nullptr ? JVMTI_DISABLE : JVMTI_ENABLE; |
| // Lock the event_info_mutex_ while we set the event to make sure it isn't lost by a concurrent |
| // change to the normal callbacks. |
| { |
| art::WriterMutexLock lk(art::Thread::Current(), art_env->event_info_mutex_); |
| if (art_env->event_callbacks.get() == nullptr) { |
| art_env->event_callbacks.reset(new ArtJvmtiEventCallbacks()); |
| } |
| jvmtiError err = art_env->event_callbacks->Set(extension_event_index, callback); |
| if (err != OK) { |
| return err; |
| } |
| } |
| return event_handler->SetEvent(art_env, |
| /*thread=*/nullptr, |
| static_cast<ArtJvmtiEvent>(extension_event_index), |
| mode); |
| } |
| |
| } // namespace openjdkjvmti |