| /* Copyright (C) 2016 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, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * 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 "ti_field.h" |
| #include <unordered_map> |
| |
| #include "android-base/thread_annotations.h" |
| #include "art_field-inl.h" |
| #include "art_field.h" |
| #include "art_jvmti.h" |
| #include "base/enums.h" |
| #include "base/locks.h" |
| #include "dex/dex_file_annotations.h" |
| #include "dex/modifiers.h" |
| #include "jni/jni_internal.h" |
| #include "mirror/object_array-inl.h" |
| #include "reflective_value_visitor.h" |
| #include "runtime.h" |
| #include "runtime_callbacks.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "thread-current-inl.h" |
| |
| namespace openjdkjvmti { |
| |
| class JvmtiFieldReflectionSource : public art::ReflectionSourceInfo { |
| public: |
| JvmtiFieldReflectionSource(bool is_access, art::ArtField* f) |
| : art::ReflectionSourceInfo(art::ReflectionSourceType::kSourceMiscInternal), |
| is_access_(is_access), |
| f_(f) {} |
| void Describe(std::ostream& os) const override REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| art::ReflectionSourceInfo::Describe(os); |
| os << " jvmti Field" << (is_access_ ? "Access" : "Modification") |
| << "Watch Target=" << f_->PrettyField(); |
| } |
| |
| private: |
| bool is_access_; |
| art::ArtField* f_; |
| }; |
| struct FieldReflectiveValueCallback : public art::ReflectiveValueVisitCallback { |
| public: |
| void VisitReflectiveTargets(art::ReflectiveValueVisitor* visitor) |
| REQUIRES(art::Locks::mutator_lock_) { |
| art::Thread* self = art::Thread::Current(); |
| event_handler->ForEachEnv(self, [&](ArtJvmTiEnv* env) NO_THREAD_SAFETY_ANALYSIS { |
| art::Locks::mutator_lock_->AssertExclusiveHeld(self); |
| art::WriterMutexLock mu(self, env->event_info_mutex_); |
| std::vector<std::pair<art::ArtField*, art::ArtField*>> updated_access_fields; |
| for (auto it : env->access_watched_fields) { |
| art::ArtField* af = |
| visitor->VisitField(it, JvmtiFieldReflectionSource(/*is_access=*/true, it)); |
| if (af != it) { |
| updated_access_fields.push_back({ af, it }); |
| } |
| } |
| for (auto it : updated_access_fields) { |
| DCHECK(env->access_watched_fields.find(it.second) != env->access_watched_fields.end()); |
| env->access_watched_fields.erase(it.second); |
| env->access_watched_fields.insert(it.first); |
| } |
| std::vector<std::pair<art::ArtField*, art::ArtField*>> updated_modify_fields; |
| for (auto it : env->modify_watched_fields) { |
| art::ArtField* af = |
| visitor->VisitField(it, JvmtiFieldReflectionSource(/*is_access=*/false, it)); |
| if (af != it) { |
| updated_modify_fields.push_back({ af, it }); |
| } |
| } |
| for (auto it : updated_modify_fields) { |
| DCHECK(env->modify_watched_fields.find(it.second) != env->modify_watched_fields.end()); |
| env->modify_watched_fields.erase(it.second); |
| env->modify_watched_fields.insert(it.first); |
| } |
| }); |
| } |
| |
| EventHandler* event_handler = nullptr; |
| }; |
| |
| static FieldReflectiveValueCallback gReflectiveValueCallback; |
| |
| void FieldUtil::Register(EventHandler* eh) { |
| gReflectiveValueCallback.event_handler = eh; |
| art::ScopedThreadStateChange stsc(art::Thread::Current(), |
| art::ThreadState::kWaitingForDebuggerToAttach); |
| art::ScopedSuspendAll ssa("Add reflective value visit callback"); |
| art::RuntimeCallbacks* callbacks = art::Runtime::Current()->GetRuntimeCallbacks(); |
| callbacks->AddReflectiveValueVisitCallback(&gReflectiveValueCallback); |
| } |
| |
| void FieldUtil::Unregister() { |
| art::ScopedThreadStateChange stsc(art::Thread::Current(), |
| art::ThreadState::kWaitingForDebuggerToAttach); |
| art::ScopedSuspendAll ssa("Remove reflective value visit callback"); |
| art::RuntimeCallbacks* callbacks = art::Runtime::Current()->GetRuntimeCallbacks(); |
| callbacks->RemoveReflectiveValueVisitCallback(&gReflectiveValueCallback); |
| } |
| // Note: For all these functions, we could do a check that the field actually belongs to the given |
| // class. But the spec seems to assume a certain encoding of the field ID, and so doesn't |
| // specify any errors. |
| |
| jvmtiError FieldUtil::GetFieldName(jvmtiEnv* env, |
| jclass klass, |
| jfieldID field, |
| char** name_ptr, |
| char** signature_ptr, |
| char** generic_ptr) { |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ArtField* art_field = art::jni::DecodeArtField(field); |
| |
| JvmtiUniquePtr<char[]> name_copy; |
| if (name_ptr != nullptr) { |
| const char* field_name = art_field->GetName(); |
| if (field_name == nullptr) { |
| field_name = "<error>"; |
| } |
| jvmtiError ret; |
| name_copy = CopyString(env, field_name, &ret); |
| if (name_copy == nullptr) { |
| return ret; |
| } |
| *name_ptr = name_copy.get(); |
| } |
| |
| JvmtiUniquePtr<char[]> signature_copy; |
| if (signature_ptr != nullptr) { |
| const char* sig = art_field->GetTypeDescriptor(); |
| jvmtiError ret; |
| signature_copy = CopyString(env, sig, &ret); |
| if (signature_copy == nullptr) { |
| return ret; |
| } |
| *signature_ptr = signature_copy.get(); |
| } |
| |
| if (generic_ptr != nullptr) { |
| *generic_ptr = nullptr; |
| if (!art_field->GetDeclaringClass()->IsProxyClass()) { |
| art::ObjPtr<art::mirror::ObjectArray<art::mirror::String>> str_array = |
| art::annotations::GetSignatureAnnotationForField(art_field); |
| if (str_array != nullptr) { |
| std::ostringstream oss; |
| for (auto str : str_array->Iterate()) { |
| oss << str->ToModifiedUtf8(); |
| } |
| std::string output_string = oss.str(); |
| jvmtiError ret; |
| JvmtiUniquePtr<char[]> copy = CopyString(env, output_string.c_str(), &ret); |
| if (copy == nullptr) { |
| return ret; |
| } |
| *generic_ptr = copy.release(); |
| } else if (soa.Self()->IsExceptionPending()) { |
| // TODO: Should we report an error here? |
| soa.Self()->ClearException(); |
| } |
| } |
| } |
| |
| // Everything is fine, release the buffers. |
| name_copy.release(); |
| signature_copy.release(); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError FieldUtil::GetFieldDeclaringClass(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass klass, |
| jfieldID field, |
| jclass* declaring_class_ptr) { |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| if (declaring_class_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ArtField* art_field = art::jni::DecodeArtField(field); |
| art::ObjPtr<art::mirror::Class> field_klass = art_field->GetDeclaringClass(); |
| |
| *declaring_class_ptr = soa.AddLocalReference<jclass>(field_klass); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError FieldUtil::GetFieldModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass klass, |
| jfieldID field, |
| jint* modifiers_ptr) { |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| if (modifiers_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ArtField* art_field = art::jni::DecodeArtField(field); |
| // Note: Keep this code in sync with Field.getModifiers. |
| uint32_t modifiers = art_field->GetAccessFlags() & 0xFFFF; |
| |
| *modifiers_ptr = modifiers; |
| return ERR(NONE); |
| } |
| |
| jvmtiError FieldUtil::IsFieldSynthetic(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass klass, |
| jfieldID field, |
| jboolean* is_synthetic_ptr) { |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| if (is_synthetic_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ArtField* art_field = art::jni::DecodeArtField(field); |
| uint32_t modifiers = art_field->GetAccessFlags(); |
| |
| *is_synthetic_ptr = ((modifiers & art::kAccSynthetic) != 0) ? JNI_TRUE : JNI_FALSE; |
| return ERR(NONE); |
| } |
| |
| jvmtiError FieldUtil::SetFieldModificationWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { |
| ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); |
| art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| auto res_pair = env->modify_watched_fields.insert(art::jni::DecodeArtField(field)); |
| if (!res_pair.second) { |
| // Didn't get inserted because it's already present! |
| return ERR(DUPLICATE); |
| } |
| return OK; |
| } |
| |
| jvmtiError FieldUtil::ClearFieldModificationWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { |
| ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); |
| art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| auto pos = env->modify_watched_fields.find(art::jni::DecodeArtField(field)); |
| if (pos == env->modify_watched_fields.end()) { |
| return ERR(NOT_FOUND); |
| } |
| env->modify_watched_fields.erase(pos); |
| return OK; |
| } |
| |
| jvmtiError FieldUtil::SetFieldAccessWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { |
| ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); |
| art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| auto res_pair = env->access_watched_fields.insert(art::jni::DecodeArtField(field)); |
| if (!res_pair.second) { |
| // Didn't get inserted because it's already present! |
| return ERR(DUPLICATE); |
| } |
| return OK; |
| } |
| |
| jvmtiError FieldUtil::ClearFieldAccessWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { |
| ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); |
| art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| if (field == nullptr) { |
| return ERR(INVALID_FIELDID); |
| } |
| auto pos = env->access_watched_fields.find(art::jni::DecodeArtField(field)); |
| if (pos == env->access_watched_fields.end()) { |
| return ERR(NOT_FOUND); |
| } |
| env->access_watched_fields.erase(pos); |
| return OK; |
| } |
| |
| } // namespace openjdkjvmti |