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340 lines
12 KiB
340 lines
12 KiB
/* Copyright (C) 2016 The Android Open Source Project
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This file implements interfaces from the file jvmti.h. This implementation
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* is licensed under the same terms as the file jvmti.h. The
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* copyright and license information for the file jvmti.h follows.
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*
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "ti_field.h"
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#include <unordered_map>
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#include "android-base/thread_annotations.h"
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#include "art_field-inl.h"
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#include "art_field.h"
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#include "art_jvmti.h"
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#include "base/enums.h"
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#include "base/locks.h"
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#include "dex/dex_file_annotations.h"
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#include "dex/modifiers.h"
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#include "jni/jni_internal.h"
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#include "mirror/object_array-inl.h"
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#include "reflective_value_visitor.h"
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#include "runtime.h"
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#include "runtime_callbacks.h"
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#include "scoped_thread_state_change-inl.h"
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#include "thread-current-inl.h"
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namespace openjdkjvmti {
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class JvmtiFieldReflectionSource : public art::ReflectionSourceInfo {
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public:
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JvmtiFieldReflectionSource(bool is_access, art::ArtField* f)
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: art::ReflectionSourceInfo(art::ReflectionSourceType::kSourceMiscInternal),
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is_access_(is_access),
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f_(f) {}
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void Describe(std::ostream& os) const override REQUIRES_SHARED(art::Locks::mutator_lock_) {
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art::ReflectionSourceInfo::Describe(os);
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os << " jvmti Field" << (is_access_ ? "Access" : "Modification")
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<< "Watch Target=" << f_->PrettyField();
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}
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private:
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bool is_access_;
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art::ArtField* f_;
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};
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struct FieldReflectiveValueCallback : public art::ReflectiveValueVisitCallback {
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public:
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void VisitReflectiveTargets(art::ReflectiveValueVisitor* visitor)
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REQUIRES(art::Locks::mutator_lock_) {
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art::Thread* self = art::Thread::Current();
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event_handler->ForEachEnv(self, [&](ArtJvmTiEnv* env) NO_THREAD_SAFETY_ANALYSIS {
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art::Locks::mutator_lock_->AssertExclusiveHeld(self);
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art::WriterMutexLock mu(self, env->event_info_mutex_);
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std::vector<std::pair<art::ArtField*, art::ArtField*>> updated_access_fields;
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for (auto it : env->access_watched_fields) {
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art::ArtField* af =
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visitor->VisitField(it, JvmtiFieldReflectionSource(/*is_access=*/true, it));
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if (af != it) {
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updated_access_fields.push_back({ af, it });
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}
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}
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for (auto it : updated_access_fields) {
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DCHECK(env->access_watched_fields.find(it.second) != env->access_watched_fields.end());
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env->access_watched_fields.erase(it.second);
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env->access_watched_fields.insert(it.first);
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}
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std::vector<std::pair<art::ArtField*, art::ArtField*>> updated_modify_fields;
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for (auto it : env->modify_watched_fields) {
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art::ArtField* af =
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visitor->VisitField(it, JvmtiFieldReflectionSource(/*is_access=*/false, it));
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if (af != it) {
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updated_modify_fields.push_back({ af, it });
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}
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}
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for (auto it : updated_modify_fields) {
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DCHECK(env->modify_watched_fields.find(it.second) != env->modify_watched_fields.end());
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env->modify_watched_fields.erase(it.second);
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env->modify_watched_fields.insert(it.first);
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}
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});
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}
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EventHandler* event_handler = nullptr;
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};
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static FieldReflectiveValueCallback gReflectiveValueCallback;
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void FieldUtil::Register(EventHandler* eh) {
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gReflectiveValueCallback.event_handler = eh;
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art::ScopedThreadStateChange stsc(art::Thread::Current(),
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art::ThreadState::kWaitingForDebuggerToAttach);
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art::ScopedSuspendAll ssa("Add reflective value visit callback");
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art::RuntimeCallbacks* callbacks = art::Runtime::Current()->GetRuntimeCallbacks();
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callbacks->AddReflectiveValueVisitCallback(&gReflectiveValueCallback);
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}
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void FieldUtil::Unregister() {
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art::ScopedThreadStateChange stsc(art::Thread::Current(),
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art::ThreadState::kWaitingForDebuggerToAttach);
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art::ScopedSuspendAll ssa("Remove reflective value visit callback");
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art::RuntimeCallbacks* callbacks = art::Runtime::Current()->GetRuntimeCallbacks();
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callbacks->RemoveReflectiveValueVisitCallback(&gReflectiveValueCallback);
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}
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// Note: For all these functions, we could do a check that the field actually belongs to the given
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// class. But the spec seems to assume a certain encoding of the field ID, and so doesn't
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// specify any errors.
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jvmtiError FieldUtil::GetFieldName(jvmtiEnv* env,
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jclass klass,
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jfieldID field,
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char** name_ptr,
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char** signature_ptr,
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char** generic_ptr) {
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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art::ScopedObjectAccess soa(art::Thread::Current());
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art::ArtField* art_field = art::jni::DecodeArtField(field);
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JvmtiUniquePtr<char[]> name_copy;
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if (name_ptr != nullptr) {
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const char* field_name = art_field->GetName();
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if (field_name == nullptr) {
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field_name = "<error>";
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}
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jvmtiError ret;
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name_copy = CopyString(env, field_name, &ret);
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if (name_copy == nullptr) {
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return ret;
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}
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*name_ptr = name_copy.get();
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}
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JvmtiUniquePtr<char[]> signature_copy;
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if (signature_ptr != nullptr) {
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const char* sig = art_field->GetTypeDescriptor();
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jvmtiError ret;
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signature_copy = CopyString(env, sig, &ret);
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if (signature_copy == nullptr) {
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return ret;
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}
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*signature_ptr = signature_copy.get();
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}
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if (generic_ptr != nullptr) {
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*generic_ptr = nullptr;
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if (!art_field->GetDeclaringClass()->IsProxyClass()) {
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art::ObjPtr<art::mirror::ObjectArray<art::mirror::String>> str_array =
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art::annotations::GetSignatureAnnotationForField(art_field);
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if (str_array != nullptr) {
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std::ostringstream oss;
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for (auto str : str_array->Iterate()) {
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oss << str->ToModifiedUtf8();
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}
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std::string output_string = oss.str();
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jvmtiError ret;
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JvmtiUniquePtr<char[]> copy = CopyString(env, output_string.c_str(), &ret);
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if (copy == nullptr) {
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return ret;
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}
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*generic_ptr = copy.release();
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} else if (soa.Self()->IsExceptionPending()) {
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// TODO: Should we report an error here?
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soa.Self()->ClearException();
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}
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}
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}
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// Everything is fine, release the buffers.
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name_copy.release();
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signature_copy.release();
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return ERR(NONE);
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}
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jvmtiError FieldUtil::GetFieldDeclaringClass(jvmtiEnv* env ATTRIBUTE_UNUSED,
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jclass klass,
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jfieldID field,
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jclass* declaring_class_ptr) {
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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if (declaring_class_ptr == nullptr) {
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return ERR(NULL_POINTER);
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}
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art::ScopedObjectAccess soa(art::Thread::Current());
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art::ArtField* art_field = art::jni::DecodeArtField(field);
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art::ObjPtr<art::mirror::Class> field_klass = art_field->GetDeclaringClass();
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*declaring_class_ptr = soa.AddLocalReference<jclass>(field_klass);
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return ERR(NONE);
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}
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jvmtiError FieldUtil::GetFieldModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED,
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jclass klass,
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jfieldID field,
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jint* modifiers_ptr) {
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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if (modifiers_ptr == nullptr) {
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return ERR(NULL_POINTER);
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}
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art::ScopedObjectAccess soa(art::Thread::Current());
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art::ArtField* art_field = art::jni::DecodeArtField(field);
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// Note: Keep this code in sync with Field.getModifiers.
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uint32_t modifiers = art_field->GetAccessFlags() & 0xFFFF;
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*modifiers_ptr = modifiers;
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return ERR(NONE);
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}
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jvmtiError FieldUtil::IsFieldSynthetic(jvmtiEnv* env ATTRIBUTE_UNUSED,
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jclass klass,
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jfieldID field,
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jboolean* is_synthetic_ptr) {
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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if (is_synthetic_ptr == nullptr) {
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return ERR(NULL_POINTER);
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}
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art::ScopedObjectAccess soa(art::Thread::Current());
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art::ArtField* art_field = art::jni::DecodeArtField(field);
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uint32_t modifiers = art_field->GetAccessFlags();
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*is_synthetic_ptr = ((modifiers & art::kAccSynthetic) != 0) ? JNI_TRUE : JNI_FALSE;
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return ERR(NONE);
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}
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jvmtiError FieldUtil::SetFieldModificationWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) {
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ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv);
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art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_);
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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auto res_pair = env->modify_watched_fields.insert(art::jni::DecodeArtField(field));
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if (!res_pair.second) {
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// Didn't get inserted because it's already present!
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return ERR(DUPLICATE);
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}
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return OK;
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}
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jvmtiError FieldUtil::ClearFieldModificationWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) {
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ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv);
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art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_);
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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auto pos = env->modify_watched_fields.find(art::jni::DecodeArtField(field));
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if (pos == env->modify_watched_fields.end()) {
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return ERR(NOT_FOUND);
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}
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env->modify_watched_fields.erase(pos);
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return OK;
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}
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jvmtiError FieldUtil::SetFieldAccessWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) {
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ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv);
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art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_);
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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auto res_pair = env->access_watched_fields.insert(art::jni::DecodeArtField(field));
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if (!res_pair.second) {
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// Didn't get inserted because it's already present!
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return ERR(DUPLICATE);
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}
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return OK;
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}
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jvmtiError FieldUtil::ClearFieldAccessWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) {
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ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv);
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art::WriterMutexLock lk(art::Thread::Current(), env->event_info_mutex_);
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if (klass == nullptr) {
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return ERR(INVALID_CLASS);
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}
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if (field == nullptr) {
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return ERR(INVALID_FIELDID);
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}
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auto pos = env->access_watched_fields.find(art::jni::DecodeArtField(field));
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if (pos == env->access_watched_fields.end()) {
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return ERR(NOT_FOUND);
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}
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env->access_watched_fields.erase(pos);
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return OK;
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}
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} // namespace openjdkjvmti
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