| /* 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_class.h" |
| |
| #include "android-base/stringprintf.h" |
| |
| #include <mutex> |
| #include <string_view> |
| #include <unordered_set> |
| |
| #include "art_jvmti.h" |
| #include "base/array_ref.h" |
| #include "base/macros.h" |
| #include "base/utils.h" |
| #include "class_linker.h" |
| #include "class_loader_utils.h" |
| #include "class_table-inl.h" |
| #include "common_throws.h" |
| #include "dex/art_dex_file_loader.h" |
| #include "dex/dex_file_annotations.h" |
| #include "dex/dex_file_loader.h" |
| #include "dex/primitive.h" |
| #include "events-inl.h" |
| #include "fixed_up_dex_file.h" |
| #include "gc/heap-visit-objects-inl.h" |
| #include "gc/heap.h" |
| #include "gc_root.h" |
| #include "handle.h" |
| #include "jni/jni_env_ext-inl.h" |
| #include "jni/jni_internal.h" |
| #include "mirror/array-alloc-inl.h" |
| #include "mirror/array-inl.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/class_ext.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object-refvisitor-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "mirror/object_reference.h" |
| #include "mirror/reference-inl.h" |
| #include "nativehelper/scoped_local_ref.h" |
| #include "reflection.h" |
| #include "runtime.h" |
| #include "runtime_callbacks.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "thread-current-inl.h" |
| #include "thread_list.h" |
| #include "ti_class_definition.h" |
| #include "ti_class_loader-inl.h" |
| #include "ti_logging.h" |
| #include "ti_phase.h" |
| #include "ti_redefine.h" |
| #include "transform.h" |
| #include "well_known_classes.h" |
| |
| namespace openjdkjvmti { |
| |
| using android::base::StringPrintf; |
| |
| static std::unique_ptr<const art::DexFile> MakeSingleDexFile(art::Thread* self, |
| const char* descriptor, |
| const std::string& orig_location, |
| jint final_len, |
| const unsigned char* final_dex_data) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| // Make the mmap |
| std::string error_msg; |
| art::ArrayRef<const unsigned char> final_data(final_dex_data, final_len); |
| art::MemMap map = Redefiner::MoveDataToMemMap(orig_location, final_data, &error_msg); |
| if (!map.IsValid()) { |
| LOG(WARNING) << "Unable to allocate mmap for redefined dex file! Error was: " << error_msg; |
| self->ThrowOutOfMemoryError(StringPrintf( |
| "Unable to allocate dex file for transformation of %s", descriptor).c_str()); |
| return nullptr; |
| } |
| |
| // Make a dex-file |
| if (map.Size() < sizeof(art::DexFile::Header)) { |
| LOG(WARNING) << "Could not read dex file header because dex_data was too short"; |
| art::ThrowClassFormatError(nullptr, |
| "Unable to read transformed dex file of %s", |
| descriptor); |
| return nullptr; |
| } |
| uint32_t checksum = reinterpret_cast<const art::DexFile::Header*>(map.Begin())->checksum_; |
| std::string map_name = map.GetName(); |
| const art::ArtDexFileLoader dex_file_loader; |
| std::unique_ptr<const art::DexFile> dex_file(dex_file_loader.Open(map_name, |
| checksum, |
| std::move(map), |
| /*verify=*/true, |
| /*verify_checksum=*/true, |
| &error_msg)); |
| if (dex_file.get() == nullptr) { |
| LOG(WARNING) << "Unable to load modified dex file for " << descriptor << ": " << error_msg; |
| art::ThrowClassFormatError(nullptr, |
| "Unable to read transformed dex file of %s because %s", |
| descriptor, |
| error_msg.c_str()); |
| return nullptr; |
| } |
| if (dex_file->NumClassDefs() != 1) { |
| LOG(WARNING) << "Dex file contains more than 1 class_def. Ignoring."; |
| // TODO Throw some other sort of error here maybe? |
| art::ThrowClassFormatError( |
| nullptr, |
| "Unable to use transformed dex file of %s because it contained too many classes", |
| descriptor); |
| return nullptr; |
| } |
| return dex_file; |
| } |
| |
| // A deleter that acts like the jvmtiEnv->Deallocate so that asan does not get tripped up. |
| // TODO We should everything use the actual jvmtiEnv->Allocate/Deallocate functions once we can |
| // figure out which env to use. |
| template <typename T> |
| class FakeJvmtiDeleter { |
| public: |
| FakeJvmtiDeleter() {} |
| |
| FakeJvmtiDeleter(FakeJvmtiDeleter&) = default; |
| FakeJvmtiDeleter(FakeJvmtiDeleter&&) noexcept = default; |
| FakeJvmtiDeleter& operator=(const FakeJvmtiDeleter&) = default; |
| |
| template <typename U> void operator()(const U* ptr) const { |
| if (ptr != nullptr) { |
| free(const_cast<U*>(ptr)); |
| } |
| } |
| }; |
| |
| struct ClassCallback : public art::ClassLoadCallback { |
| void ClassPreDefine(const char* descriptor, |
| art::Handle<art::mirror::Class> klass, |
| art::Handle<art::mirror::ClassLoader> class_loader, |
| const art::DexFile& initial_dex_file, |
| const art::dex::ClassDef& initial_class_def ATTRIBUTE_UNUSED, |
| /*out*/art::DexFile const** final_dex_file, |
| /*out*/art::dex::ClassDef const** final_class_def) |
| override REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| bool is_enabled = |
| event_handler->IsEventEnabledAnywhere(ArtJvmtiEvent::kClassFileLoadHookRetransformable) || |
| event_handler->IsEventEnabledAnywhere(ArtJvmtiEvent::kClassFileLoadHookNonRetransformable); |
| if (!is_enabled) { |
| return; |
| } |
| if (descriptor[0] != 'L') { |
| // It is a primitive or array. Just return |
| return; |
| } |
| jvmtiPhase phase = PhaseUtil::GetPhaseUnchecked(); |
| if (UNLIKELY(phase != JVMTI_PHASE_START && phase != JVMTI_PHASE_LIVE)) { |
| // We want to wait until we are at least in the START phase so that all WellKnownClasses and |
| // mirror classes have been initialized and loaded. The runtime relies on these classes having |
| // specific fields and methods present. Since PreDefine hooks don't need to abide by this |
| // restriction we will simply not send the event for these classes. |
| LOG(WARNING) << "Ignoring load of class <" << descriptor << "> as it is being loaded during " |
| << "runtime initialization."; |
| return; |
| } |
| |
| art::Thread* self = art::Thread::Current(); |
| ArtClassDefinition def; |
| def.InitFirstLoad(descriptor, class_loader, initial_dex_file); |
| |
| // Call all non-retransformable agents. |
| Transformer::TransformSingleClassDirect<ArtJvmtiEvent::kClassFileLoadHookNonRetransformable>( |
| event_handler, self, &def); |
| |
| std::vector<unsigned char> post_non_retransform; |
| if (def.IsModified()) { |
| // Copy the dex data after the non-retransformable events. |
| post_non_retransform.resize(def.GetDexData().size()); |
| memcpy(post_non_retransform.data(), def.GetDexData().data(), post_non_retransform.size()); |
| } |
| |
| // Call all retransformable agents. |
| Transformer::TransformSingleClassDirect<ArtJvmtiEvent::kClassFileLoadHookRetransformable>( |
| event_handler, self, &def); |
| |
| if (def.IsModified()) { |
| LOG(WARNING) << "Changing class " << descriptor; |
| art::StackHandleScope<2> hs(self); |
| // Save the results of all the non-retransformable agents. |
| // First allocate the ClassExt |
| art::Handle<art::mirror::ClassExt> ext(hs.NewHandle(klass->EnsureExtDataPresent(self))); |
| // Make sure we have a ClassExt. This is fine even though we are a temporary since it will |
| // get copied. |
| if (ext.IsNull()) { |
| // We will just return failure if we fail to allocate |
| LOG(WARNING) << "Could not allocate ext-data for class '" << descriptor << "'. " |
| << "Aborting transformation since we will be unable to store it."; |
| self->AssertPendingOOMException(); |
| return; |
| } |
| |
| // Allocate the byte array to store the dex file bytes in. |
| art::MutableHandle<art::mirror::Object> arr(hs.NewHandle<art::mirror::Object>(nullptr)); |
| if (post_non_retransform.empty() && strcmp(descriptor, "Ljava/lang/Long;") != 0) { |
| // we didn't have any non-retransformable agents. We can just cache a pointer to the |
| // initial_dex_file. It will be kept live by the class_loader. |
| jlong dex_ptr = reinterpret_cast<uintptr_t>(&initial_dex_file); |
| art::JValue val; |
| val.SetJ(dex_ptr); |
| arr.Assign(art::BoxPrimitive(art::Primitive::kPrimLong, val)); |
| } else { |
| arr.Assign(art::mirror::ByteArray::AllocateAndFill( |
| self, |
| reinterpret_cast<const signed char*>(post_non_retransform.data()), |
| post_non_retransform.size())); |
| } |
| if (arr.IsNull()) { |
| LOG(WARNING) << "Unable to allocate memory for initial dex-file. Aborting transformation"; |
| self->AssertPendingOOMException(); |
| return; |
| } |
| |
| std::unique_ptr<const art::DexFile> dex_file(MakeSingleDexFile(self, |
| descriptor, |
| initial_dex_file.GetLocation(), |
| def.GetDexData().size(), |
| def.GetDexData().data())); |
| if (dex_file.get() == nullptr) { |
| return; |
| } |
| |
| // TODO Check Redefined dex file for all invariants. |
| LOG(WARNING) << "Dex file created by class-definition time transformation of " |
| << descriptor << " is not checked for all retransformation invariants."; |
| |
| if (!ClassLoaderHelper::AddToClassLoader(self, class_loader, dex_file.get())) { |
| LOG(ERROR) << "Unable to add " << descriptor << " to class loader!"; |
| return; |
| } |
| |
| // Actually set the ClassExt's original bytes once we have actually succeeded. |
| ext->SetOriginalDexFile(arr.Get()); |
| // Set the return values |
| *final_class_def = &dex_file->GetClassDef(0); |
| *final_dex_file = dex_file.release(); |
| } |
| } |
| |
| void ClassLoad(art::Handle<art::mirror::Class> klass) override |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| if (event_handler->IsEventEnabledAnywhere(ArtJvmtiEvent::kClassLoad)) { |
| art::Thread* thread = art::Thread::Current(); |
| ScopedLocalRef<jclass> jklass(thread->GetJniEnv(), |
| thread->GetJniEnv()->AddLocalReference<jclass>(klass.Get())); |
| art::ObjPtr<art::mirror::Object> peer(thread->GetPeer()); |
| ScopedLocalRef<jthread> thread_jni( |
| thread->GetJniEnv(), |
| peer.IsNull() ? nullptr : thread->GetJniEnv()->AddLocalReference<jthread>(peer)); |
| event_handler->DispatchEvent<ArtJvmtiEvent::kClassLoad>( |
| thread, |
| static_cast<JNIEnv*>(thread->GetJniEnv()), |
| thread_jni.get(), |
| jklass.get()); |
| if (klass->IsTemp()) { |
| AddTempClass(thread, jklass.get()); |
| } |
| } |
| } |
| |
| void ClassPrepare(art::Handle<art::mirror::Class> temp_klass, |
| art::Handle<art::mirror::Class> klass) |
| override REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| if (event_handler->IsEventEnabledAnywhere(ArtJvmtiEvent::kClassPrepare)) { |
| art::Thread* thread = art::Thread::Current(); |
| if (temp_klass.Get() != klass.Get()) { |
| DCHECK(temp_klass->IsTemp()); |
| DCHECK(temp_klass->IsRetired()); |
| HandleTempClass(thread, temp_klass, klass); |
| } |
| ScopedLocalRef<jclass> jklass(thread->GetJniEnv(), |
| thread->GetJniEnv()->AddLocalReference<jclass>(klass.Get())); |
| art::ObjPtr<art::mirror::Object> peer(thread->GetPeer()); |
| ScopedLocalRef<jthread> thread_jni( |
| thread->GetJniEnv(), |
| peer.IsNull() ? nullptr : thread->GetJniEnv()->AddLocalReference<jthread>(peer)); |
| event_handler->DispatchEvent<ArtJvmtiEvent::kClassPrepare>( |
| thread, |
| static_cast<JNIEnv*>(thread->GetJniEnv()), |
| thread_jni.get(), |
| jklass.get()); |
| } |
| } |
| |
| // To support parallel class-loading, we need to perform some locking dances here. Namely, |
| // the fixup stage must not be holding the temp_classes lock when it fixes up the system |
| // (as that requires suspending all mutators). |
| |
| void AddTempClass(art::Thread* self, jclass klass) { |
| std::unique_lock<std::mutex> mu(temp_classes_lock); |
| jclass global_klass = reinterpret_cast<jclass>(self->GetJniEnv()->NewGlobalRef(klass)); |
| temp_classes.push_back(global_klass); |
| } |
| |
| void HandleTempClass(art::Thread* self, |
| art::Handle<art::mirror::Class> temp_klass, |
| art::Handle<art::mirror::Class> klass) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| bool requires_fixup = false; |
| { |
| std::unique_lock<std::mutex> mu(temp_classes_lock); |
| if (temp_classes.empty()) { |
| return; |
| } |
| |
| for (auto it = temp_classes.begin(); it != temp_classes.end(); ++it) { |
| if (temp_klass.Get() == art::ObjPtr<art::mirror::Class>::DownCast(self->DecodeJObject(*it))) { |
| self->GetJniEnv()->DeleteGlobalRef(*it); |
| temp_classes.erase(it); |
| requires_fixup = true; |
| break; |
| } |
| } |
| } |
| if (requires_fixup) { |
| FixupTempClass(self, temp_klass, klass); |
| } |
| } |
| |
| void FixupTempClass(art::Thread* self, |
| art::Handle<art::mirror::Class> temp_klass, |
| art::Handle<art::mirror::Class> klass) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| // Suspend everything. |
| art::gc::Heap* heap = art::Runtime::Current()->GetHeap(); |
| if (heap->IsGcConcurrentAndMoving()) { |
| // Need to take a heap dump while GC isn't running. See the |
| // comment in Heap::VisitObjects(). |
| heap->IncrementDisableMovingGC(self); |
| } |
| { |
| art::ScopedThreadSuspension sts(self, art::kWaitingForVisitObjects); |
| art::ScopedSuspendAll ssa("FixupTempClass"); |
| |
| art::mirror::Class* input = temp_klass.Get(); |
| art::mirror::Class* output = klass.Get(); |
| |
| FixupGlobalReferenceTables(input, output); |
| FixupLocalReferenceTables(self, input, output); |
| FixupHeap(input, output); |
| } |
| if (heap->IsGcConcurrentAndMoving()) { |
| heap->DecrementDisableMovingGC(self); |
| } |
| } |
| |
| class RootUpdater : public art::RootVisitor { |
| public: |
| RootUpdater(const art::mirror::Class* input, art::mirror::Class* output) |
| : input_(input), output_(output) {} |
| |
| void VisitRoots(art::mirror::Object*** roots, |
| size_t count, |
| const art::RootInfo& info ATTRIBUTE_UNUSED) |
| override { |
| for (size_t i = 0; i != count; ++i) { |
| if (*roots[i] == input_) { |
| *roots[i] = output_; |
| } |
| } |
| } |
| |
| void VisitRoots(art::mirror::CompressedReference<art::mirror::Object>** roots, |
| size_t count, |
| const art::RootInfo& info ATTRIBUTE_UNUSED) |
| override REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| for (size_t i = 0; i != count; ++i) { |
| if (roots[i]->AsMirrorPtr() == input_) { |
| roots[i]->Assign(output_); |
| } |
| } |
| } |
| |
| private: |
| const art::mirror::Class* input_; |
| art::mirror::Class* output_; |
| }; |
| |
| void FixupGlobalReferenceTables(art::mirror::Class* input, art::mirror::Class* output) |
| REQUIRES(art::Locks::mutator_lock_) { |
| art::JavaVMExt* java_vm = art::Runtime::Current()->GetJavaVM(); |
| |
| // Fix up the global table with a root visitor. |
| RootUpdater global_update(input, output); |
| java_vm->VisitRoots(&global_update); |
| |
| class WeakGlobalUpdate : public art::IsMarkedVisitor { |
| public: |
| WeakGlobalUpdate(art::mirror::Class* root_input, art::mirror::Class* root_output) |
| : input_(root_input), output_(root_output) {} |
| |
| art::mirror::Object* IsMarked(art::mirror::Object* obj) override { |
| if (obj == input_) { |
| return output_; |
| } |
| return obj; |
| } |
| |
| private: |
| const art::mirror::Class* input_; |
| art::mirror::Class* output_; |
| }; |
| WeakGlobalUpdate weak_global_update(input, output); |
| java_vm->SweepJniWeakGlobals(&weak_global_update); |
| } |
| |
| void FixupLocalReferenceTables(art::Thread* self, |
| art::mirror::Class* input, |
| art::mirror::Class* output) |
| REQUIRES(art::Locks::mutator_lock_) { |
| class LocalUpdate { |
| public: |
| LocalUpdate(const art::mirror::Class* root_input, art::mirror::Class* root_output) |
| : input_(root_input), output_(root_output) {} |
| |
| static void Callback(art::Thread* t, void* arg) REQUIRES(art::Locks::mutator_lock_) { |
| LocalUpdate* local = reinterpret_cast<LocalUpdate*>(arg); |
| |
| // Fix up the local table with a root visitor. |
| RootUpdater local_update(local->input_, local->output_); |
| t->GetJniEnv()->VisitJniLocalRoots( |
| &local_update, art::RootInfo(art::kRootJNILocal, t->GetThreadId())); |
| } |
| |
| private: |
| const art::mirror::Class* input_; |
| art::mirror::Class* output_; |
| }; |
| LocalUpdate local_upd(input, output); |
| art::MutexLock mu(self, *art::Locks::thread_list_lock_); |
| art::Runtime::Current()->GetThreadList()->ForEach(LocalUpdate::Callback, &local_upd); |
| } |
| |
| void FixupHeap(art::mirror::Class* input, art::mirror::Class* output) |
| REQUIRES(art::Locks::mutator_lock_) { |
| class HeapFixupVisitor { |
| public: |
| HeapFixupVisitor(const art::mirror::Class* root_input, art::mirror::Class* root_output) |
| : input_(root_input), output_(root_output) {} |
| |
| void operator()(art::mirror::Object* src, |
| art::MemberOffset field_offset, |
| bool is_static ATTRIBUTE_UNUSED) const |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| art::mirror::HeapReference<art::mirror::Object>* trg = |
| src->GetFieldObjectReferenceAddr(field_offset); |
| if (trg->AsMirrorPtr() == input_) { |
| DCHECK_NE(field_offset.Uint32Value(), 0u); // This shouldn't be the class field of |
| // an object. |
| trg->Assign(output_); |
| } |
| } |
| |
| void operator()(art::ObjPtr<art::mirror::Class> klass ATTRIBUTE_UNUSED, |
| art::ObjPtr<art::mirror::Reference> reference) const |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| art::mirror::Object* val = reference->GetReferent(); |
| if (val == input_) { |
| reference->SetReferent<false>(output_); |
| } |
| } |
| |
| void VisitRoot(art::mirror::CompressedReference<art::mirror::Object>* root ATTRIBUTE_UNUSED) |
| const { |
| LOG(FATAL) << "Unreachable"; |
| } |
| |
| void VisitRootIfNonNull( |
| art::mirror::CompressedReference<art::mirror::Object>* root ATTRIBUTE_UNUSED) const { |
| LOG(FATAL) << "Unreachable"; |
| } |
| |
| private: |
| const art::mirror::Class* input_; |
| art::mirror::Class* output_; |
| }; |
| HeapFixupVisitor hfv(input, output); |
| auto object_visitor = [&](art::mirror::Object* obj) { |
| obj->VisitReferences<false>(hfv, hfv); // Visit references, not native roots. |
| }; |
| art::Runtime::Current()->GetHeap()->VisitObjectsPaused(object_visitor); |
| } |
| |
| // A set of all the temp classes we have handed out. We have to fix up references to these. |
| // For simplicity, we store the temp classes as JNI global references in a vector. Normally a |
| // Prepare event will closely follow, so the vector should be small. |
| std::mutex temp_classes_lock; |
| std::vector<jclass> temp_classes; |
| |
| EventHandler* event_handler = nullptr; |
| }; |
| |
| ClassCallback gClassCallback; |
| |
| void ClassUtil::Register(EventHandler* handler) { |
| gClassCallback.event_handler = handler; |
| art::ScopedThreadStateChange stsc(art::Thread::Current(), |
| art::ThreadState::kWaitingForDebuggerToAttach); |
| art::ScopedSuspendAll ssa("Add load callback"); |
| art::Runtime::Current()->GetRuntimeCallbacks()->AddClassLoadCallback(&gClassCallback); |
| } |
| |
| void ClassUtil::Unregister() { |
| art::ScopedThreadStateChange stsc(art::Thread::Current(), |
| art::ThreadState::kWaitingForDebuggerToAttach); |
| art::ScopedSuspendAll ssa("Remove thread callback"); |
| art::Runtime* runtime = art::Runtime::Current(); |
| runtime->GetRuntimeCallbacks()->RemoveClassLoadCallback(&gClassCallback); |
| } |
| |
| jvmtiError ClassUtil::GetClassFields(jvmtiEnv* env, |
| jclass jklass, |
| jint* field_count_ptr, |
| jfieldID** fields_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| // Check if this class is a temporary class object used for loading. Since we are seeing it the |
| // class must not have been prepared yet since otherwise the fixup would have gotten the jobject |
| // to point to the final class object. |
| if (klass->IsTemp() || klass->IsRetired()) { |
| return ERR(CLASS_NOT_PREPARED); |
| } |
| |
| if (field_count_ptr == nullptr || fields_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| art::IterationRange<art::StrideIterator<art::ArtField>> ifields = klass->GetIFields(); |
| art::IterationRange<art::StrideIterator<art::ArtField>> sfields = klass->GetSFields(); |
| size_t array_size = klass->NumInstanceFields() + klass->NumStaticFields(); |
| |
| unsigned char* out_ptr; |
| jvmtiError allocError = env->Allocate(array_size * sizeof(jfieldID), &out_ptr); |
| if (allocError != ERR(NONE)) { |
| return allocError; |
| } |
| jfieldID* field_array = reinterpret_cast<jfieldID*>(out_ptr); |
| |
| size_t array_idx = 0; |
| for (art::ArtField& field : sfields) { |
| field_array[array_idx] = art::jni::EncodeArtField(&field); |
| ++array_idx; |
| } |
| for (art::ArtField& field : ifields) { |
| field_array[array_idx] = art::jni::EncodeArtField(&field); |
| ++array_idx; |
| } |
| |
| *field_count_ptr = static_cast<jint>(array_size); |
| *fields_ptr = field_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassMethods(jvmtiEnv* env, |
| jclass jklass, |
| jint* method_count_ptr, |
| jmethodID** methods_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| // Check if this class is a temporary class object used for loading. Since we are seeing it the |
| // class must not have been prepared yet since otherwise the fixup would have gotten the jobject |
| // to point to the final class object. |
| if (klass->IsTemp() || klass->IsRetired()) { |
| return ERR(CLASS_NOT_PREPARED); |
| } |
| |
| if (method_count_ptr == nullptr || methods_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| size_t array_size = klass->NumDeclaredVirtualMethods() + klass->NumDirectMethods(); |
| unsigned char* out_ptr; |
| jvmtiError allocError = env->Allocate(array_size * sizeof(jmethodID), &out_ptr); |
| if (allocError != ERR(NONE)) { |
| return allocError; |
| } |
| jmethodID* method_array = reinterpret_cast<jmethodID*>(out_ptr); |
| |
| if (art::kIsDebugBuild) { |
| size_t count = 0; |
| for (auto& m ATTRIBUTE_UNUSED : klass->GetDeclaredMethods(art::kRuntimePointerSize)) { |
| count++; |
| } |
| CHECK_EQ(count, klass->NumDirectMethods() + klass->NumDeclaredVirtualMethods()); |
| } |
| |
| size_t array_idx = 0; |
| for (auto& m : klass->GetDeclaredMethods(art::kRuntimePointerSize)) { |
| method_array[array_idx] = art::jni::EncodeArtMethod(&m); |
| ++array_idx; |
| } |
| |
| *method_count_ptr = static_cast<jint>(array_size); |
| *methods_ptr = method_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetImplementedInterfaces(jvmtiEnv* env, |
| jclass jklass, |
| jint* interface_count_ptr, |
| jclass** interfaces_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (interface_count_ptr == nullptr || interfaces_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| // Need to handle array specifically. Arrays implement Serializable and Cloneable, but the |
| // spec says these should not be reported. |
| if (klass->IsArrayClass()) { |
| *interface_count_ptr = 0; |
| *interfaces_ptr = nullptr; // TODO: Should we allocate a dummy here? |
| return ERR(NONE); |
| } |
| |
| size_t array_size = klass->NumDirectInterfaces(); |
| unsigned char* out_ptr; |
| jvmtiError allocError = env->Allocate(array_size * sizeof(jclass), &out_ptr); |
| if (allocError != ERR(NONE)) { |
| return allocError; |
| } |
| jclass* interface_array = reinterpret_cast<jclass*>(out_ptr); |
| |
| art::StackHandleScope<1> hs(soa.Self()); |
| art::Handle<art::mirror::Class> h_klass(hs.NewHandle(klass)); |
| |
| for (uint32_t idx = 0; idx != array_size; ++idx) { |
| art::ObjPtr<art::mirror::Class> inf_klass = |
| art::mirror::Class::ResolveDirectInterface(soa.Self(), h_klass, idx); |
| if (inf_klass == nullptr) { |
| soa.Self()->ClearException(); |
| env->Deallocate(out_ptr); |
| // TODO: What is the right error code here? |
| return ERR(INTERNAL); |
| } |
| interface_array[idx] = soa.AddLocalReference<jclass>(inf_klass); |
| } |
| |
| *interface_count_ptr = static_cast<jint>(array_size); |
| *interfaces_ptr = interface_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassSignature(jvmtiEnv* env, |
| jclass jklass, |
| char** signature_ptr, |
| char** generic_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| JvmtiUniquePtr<char[]> sig_copy; |
| if (signature_ptr != nullptr) { |
| std::string storage; |
| const char* descriptor = klass->GetDescriptor(&storage); |
| |
| jvmtiError ret; |
| sig_copy = CopyString(env, descriptor, &ret); |
| if (sig_copy == nullptr) { |
| return ret; |
| } |
| *signature_ptr = sig_copy.get(); |
| } |
| |
| if (generic_ptr != nullptr) { |
| *generic_ptr = nullptr; |
| if (!klass->IsProxyClass() && klass->GetDexCache() != nullptr) { |
| art::StackHandleScope<1> hs(soa.Self()); |
| art::Handle<art::mirror::Class> h_klass = hs.NewHandle(klass); |
| art::ObjPtr<art::mirror::ObjectArray<art::mirror::String>> str_array = |
| art::annotations::GetSignatureAnnotationForClass(h_klass); |
| if (str_array != nullptr) { |
| std::ostringstream oss; |
| for (int32_t i = 0; i != str_array->GetLength(); ++i) { |
| oss << str_array->Get(i)->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. |
| sig_copy.release(); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassStatus(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jint* status_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (status_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| if (klass->IsArrayClass()) { |
| *status_ptr = JVMTI_CLASS_STATUS_ARRAY; |
| } else if (klass->IsPrimitive()) { |
| *status_ptr = JVMTI_CLASS_STATUS_PRIMITIVE; |
| } else { |
| *status_ptr = JVMTI_CLASS_STATUS_VERIFIED; // All loaded classes are structurally verified. |
| // This is finicky. If there's an error, we'll say it wasn't prepared. |
| if (klass->IsResolved()) { |
| *status_ptr |= JVMTI_CLASS_STATUS_PREPARED; |
| } |
| if (klass->IsInitialized()) { |
| *status_ptr |= JVMTI_CLASS_STATUS_INITIALIZED; |
| } |
| // Technically the class may be erroneous for other reasons, but we do not have enough info. |
| if (klass->IsErroneous()) { |
| *status_ptr |= JVMTI_CLASS_STATUS_ERROR; |
| } |
| } |
| |
| return ERR(NONE); |
| } |
| |
| template <typename T> |
| static jvmtiError ClassIsT(jclass jklass, T test, jboolean* is_t_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (is_t_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| *is_t_ptr = test(klass) ? JNI_TRUE : JNI_FALSE; |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::IsInterface(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jboolean* is_interface_ptr) { |
| auto test = [](art::ObjPtr<art::mirror::Class> klass) REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| return klass->IsInterface(); |
| }; |
| return ClassIsT(jklass, test, is_interface_ptr); |
| } |
| |
| jvmtiError ClassUtil::IsArrayClass(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jboolean* is_array_class_ptr) { |
| auto test = [](art::ObjPtr<art::mirror::Class> klass) REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| return klass->IsArrayClass(); |
| }; |
| return ClassIsT(jklass, test, is_array_class_ptr); |
| } |
| |
| // Keep this in sync with Class.getModifiers(). |
| static uint32_t ClassGetModifiers(art::Thread* self, art::ObjPtr<art::mirror::Class> klass) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| if (klass->IsArrayClass()) { |
| uint32_t component_modifiers = ClassGetModifiers(self, klass->GetComponentType()); |
| if ((component_modifiers & art::kAccInterface) != 0) { |
| component_modifiers &= ~(art::kAccInterface | art::kAccStatic); |
| } |
| return art::kAccAbstract | art::kAccFinal | component_modifiers; |
| } |
| |
| uint32_t modifiers = klass->GetAccessFlags() & art::kAccJavaFlagsMask; |
| |
| art::StackHandleScope<1> hs(self); |
| art::Handle<art::mirror::Class> h_klass(hs.NewHandle(klass)); |
| return art::mirror::Class::GetInnerClassFlags(h_klass, modifiers); |
| } |
| |
| jvmtiError ClassUtil::GetClassModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jint* modifiers_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (modifiers_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| *modifiers_ptr = ClassGetModifiers(soa.Self(), klass); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassLoader(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jobject* classloader_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (classloader_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| *classloader_ptr = soa.AddLocalReference<jobject>(klass->GetClassLoader()); |
| |
| return ERR(NONE); |
| } |
| |
| // Copies unique class descriptors into the classes list from dex_files. |
| static jvmtiError CopyClassDescriptors(jvmtiEnv* env, |
| const std::vector<const art::DexFile*>& dex_files, |
| /*out*/jint* count_ptr, |
| /*out*/char*** classes) { |
| jvmtiError res = OK; |
| std::set<std::string_view> unique_descriptors; |
| std::vector<const char*> descriptors; |
| auto add_descriptor = [&](const char* desc) { |
| // Don't add duplicates. |
| if (res == OK && unique_descriptors.find(desc) == unique_descriptors.end()) { |
| // The desc will remain valid since we hold a ref to the class_loader. |
| unique_descriptors.insert(desc); |
| descriptors.push_back(CopyString(env, desc, &res).release()); |
| } |
| }; |
| for (const art::DexFile* dex_file : dex_files) { |
| uint32_t num_defs = dex_file->NumClassDefs(); |
| for (uint32_t i = 0; i < num_defs; i++) { |
| add_descriptor(dex_file->GetClassDescriptor(dex_file->GetClassDef(i))); |
| } |
| } |
| char** out_data = nullptr; |
| if (res == OK) { |
| res = env->Allocate(sizeof(char*) * descriptors.size(), |
| reinterpret_cast<unsigned char**>(&out_data)); |
| } |
| if (res != OK) { |
| env->Deallocate(reinterpret_cast<unsigned char*>(out_data)); |
| // Failed to allocate. Cleanup everything. |
| for (const char* data : descriptors) { |
| env->Deallocate(reinterpret_cast<unsigned char*>(const_cast<char*>(data))); |
| } |
| descriptors.clear(); |
| return res; |
| } |
| // Everything is good. |
| memcpy(out_data, descriptors.data(), sizeof(char*) * descriptors.size()); |
| *count_ptr = static_cast<jint>(descriptors.size()); |
| *classes = out_data; |
| return OK; |
| } |
| |
| jvmtiError ClassUtil::GetClassLoaderClassDescriptors(jvmtiEnv* env, |
| jobject loader, |
| /*out*/jint* count_ptr, |
| /*out*/char*** classes) { |
| art::Thread* self = art::Thread::Current(); |
| if (env == nullptr) { |
| return ERR(INVALID_ENVIRONMENT); |
| } else if (self == nullptr) { |
| return ERR(UNATTACHED_THREAD); |
| } else if (count_ptr == nullptr || classes == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| art::JNIEnvExt* jnienv = self->GetJniEnv(); |
| if (loader == nullptr || |
| jnienv->IsInstanceOf(loader, art::WellKnownClasses::java_lang_BootClassLoader)) { |
| // We can just get the dex files directly for the boot class path. |
| return CopyClassDescriptors(env, |
| art::Runtime::Current()->GetClassLinker()->GetBootClassPath(), |
| count_ptr, |
| classes); |
| } |
| if (!jnienv->IsInstanceOf(loader, art::WellKnownClasses::java_lang_ClassLoader)) { |
| return ERR(ILLEGAL_ARGUMENT); |
| } else if (!jnienv->IsInstanceOf(loader, |
| art::WellKnownClasses::dalvik_system_BaseDexClassLoader)) { |
| JVMTI_LOG(ERROR, env) << "GetClassLoaderClassDescriptors is only implemented for " |
| << "BootClassPath and dalvik.system.BaseDexClassLoader class loaders"; |
| // TODO Possibly return OK With no classes would be better since these ones cannot have any |
| // real classes associated with them. |
| return ERR(NOT_IMPLEMENTED); |
| } |
| |
| art::ScopedObjectAccess soa(self); |
| art::StackHandleScope<1> hs(self); |
| art::Handle<art::mirror::ClassLoader> class_loader( |
| hs.NewHandle(soa.Decode<art::mirror::ClassLoader>(loader))); |
| std::vector<const art::DexFile*> dex_files; |
| art::VisitClassLoaderDexFiles( |
| soa, |
| class_loader, |
| [&](const art::DexFile* dex_file) { |
| dex_files.push_back(dex_file); |
| return true; // Continue with other dex files. |
| }); |
| // We hold the loader so the dex files won't go away until after this call at worst. |
| return CopyClassDescriptors(env, dex_files, count_ptr, classes); |
| } |
| |
| jvmtiError ClassUtil::GetClassLoaderClasses(jvmtiEnv* env, |
| jobject initiating_loader, |
| jint* class_count_ptr, |
| jclass** classes_ptr) { |
| UNUSED(env, initiating_loader, class_count_ptr, classes_ptr); |
| |
| if (class_count_ptr == nullptr || classes_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| art::Thread* self = art::Thread::Current(); |
| if (!self->GetJniEnv()->IsInstanceOf(initiating_loader, |
| art::WellKnownClasses::java_lang_ClassLoader)) { |
| return ERR(ILLEGAL_ARGUMENT); |
| } |
| if (self->GetJniEnv()->IsInstanceOf(initiating_loader, |
| art::WellKnownClasses::java_lang_BootClassLoader)) { |
| // Need to use null for the BootClassLoader. |
| initiating_loader = nullptr; |
| } |
| |
| art::ScopedObjectAccess soa(self); |
| art::ObjPtr<art::mirror::ClassLoader> class_loader = |
| soa.Decode<art::mirror::ClassLoader>(initiating_loader); |
| |
| art::ClassLinker* class_linker = art::Runtime::Current()->GetClassLinker(); |
| |
| art::ReaderMutexLock mu(self, *art::Locks::classlinker_classes_lock_); |
| |
| art::ClassTable* class_table = class_linker->ClassTableForClassLoader(class_loader); |
| if (class_table == nullptr) { |
| // Nothing loaded. |
| *class_count_ptr = 0; |
| *classes_ptr = nullptr; |
| return ERR(NONE); |
| } |
| |
| struct ClassTableCount { |
| bool operator()(art::ObjPtr<art::mirror::Class> klass) { |
| DCHECK(klass != nullptr); |
| ++count; |
| return true; |
| } |
| |
| size_t count = 0; |
| }; |
| ClassTableCount ctc; |
| class_table->Visit(ctc); |
| |
| if (ctc.count == 0) { |
| // Nothing loaded. |
| *class_count_ptr = 0; |
| *classes_ptr = nullptr; |
| return ERR(NONE); |
| } |
| |
| unsigned char* data; |
| jvmtiError data_result = env->Allocate(ctc.count * sizeof(jclass), &data); |
| if (data_result != ERR(NONE)) { |
| return data_result; |
| } |
| jclass* class_array = reinterpret_cast<jclass*>(data); |
| |
| struct ClassTableFill { |
| bool operator()(art::ObjPtr<art::mirror::Class> klass) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| DCHECK(klass != nullptr); |
| DCHECK_LT(count, ctc_ref.count); |
| local_class_array[count++] = soa_ptr->AddLocalReference<jclass>(klass); |
| return true; |
| } |
| |
| jclass* local_class_array; |
| const ClassTableCount& ctc_ref; |
| art::ScopedObjectAccess* soa_ptr; |
| size_t count; |
| }; |
| ClassTableFill ctf = { class_array, ctc, &soa, 0 }; |
| class_table->Visit(ctf); |
| DCHECK_EQ(ctc.count, ctf.count); |
| |
| *class_count_ptr = ctc.count; |
| *classes_ptr = class_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassVersionNumbers(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jint* minor_version_ptr, |
| jint* major_version_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| if (jklass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| art::ObjPtr<art::mirror::Object> jklass_obj = soa.Decode<art::mirror::Object>(jklass); |
| if (!jklass_obj->IsClass()) { |
| return ERR(INVALID_CLASS); |
| } |
| art::ObjPtr<art::mirror::Class> klass = jklass_obj->AsClass(); |
| if (klass->IsPrimitive() || klass->IsArrayClass()) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (minor_version_ptr == nullptr || major_version_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| // Note: proxies will show the dex file version of java.lang.reflect.Proxy, as that is |
| // what their dex cache copies from. |
| uint32_t version = klass->GetDexFile().GetHeader().GetVersion(); |
| |
| *major_version_ptr = static_cast<jint>(version); |
| *minor_version_ptr = 0; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetSourceFileName(jvmtiEnv* env, jclass jklass, char** source_name_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| if (jklass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| art::ObjPtr<art::mirror::Object> jklass_obj = soa.Decode<art::mirror::Object>(jklass); |
| if (!jklass_obj->IsClass()) { |
| return ERR(INVALID_CLASS); |
| } |
| art::ObjPtr<art::mirror::Class> klass = jklass_obj->AsClass(); |
| if (klass->IsPrimitive() || klass->IsArrayClass()) { |
| return ERR(ABSENT_INFORMATION); |
| } |
| JvmtiUniquePtr<char[]> source_copy; |
| const char* file_name = klass->GetSourceFile(); |
| if (file_name == nullptr) { |
| return ERR(ABSENT_INFORMATION); |
| } |
| jvmtiError ret; |
| source_copy = CopyString(env, file_name, &ret); |
| if (source_copy == nullptr) { |
| return ret; |
| } |
| *source_name_ptr = source_copy.release(); |
| return OK; |
| } |
| |
| jvmtiError ClassUtil::GetSourceDebugExtension(jvmtiEnv* env, |
| jclass jklass, |
| char** source_debug_extension_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| if (jklass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| art::ObjPtr<art::mirror::Object> jklass_obj = soa.Decode<art::mirror::Object>(jklass); |
| if (!jklass_obj->IsClass()) { |
| return ERR(INVALID_CLASS); |
| } |
| art::StackHandleScope<1> hs(art::Thread::Current()); |
| art::Handle<art::mirror::Class> klass(hs.NewHandle(jklass_obj->AsClass())); |
| if (klass->IsPrimitive() || klass->IsArrayClass()) { |
| return ERR(ABSENT_INFORMATION); |
| } |
| JvmtiUniquePtr<char[]> ext_copy; |
| const char* data = art::annotations::GetSourceDebugExtension(klass); |
| if (data == nullptr) { |
| return ERR(ABSENT_INFORMATION); |
| } |
| jvmtiError ret; |
| ext_copy = CopyString(env, data, &ret); |
| if (ext_copy == nullptr) { |
| return ret; |
| } |
| *source_debug_extension_ptr = ext_copy.release(); |
| return OK; |
| } |
| |
| } // namespace openjdkjvmti |
