Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 1 | /* Copyright (C) 2016 The Android Open Source Project |
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3 | * |
| 4 | * This file implements interfaces from the file jvmti.h. This implementation |
| 5 | * is licensed under the same terms as the file jvmti.h. The |
| 6 | * copyright and license information for the file jvmti.h follows. |
| 7 | * |
| 8 | * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| 9 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 10 | * |
| 11 | * This code is free software; you can redistribute it and/or modify it |
| 12 | * under the terms of the GNU General Public License version 2 only, as |
| 13 | * published by the Free Software Foundation. Oracle designates this |
| 14 | * particular file as subject to the "Classpath" exception as provided |
| 15 | * by Oracle in the LICENSE file that accompanied this code. |
| 16 | * |
| 17 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 20 | * version 2 for more details (a copy is included in the LICENSE file that |
| 21 | * accompanied this code). |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License version |
| 24 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 25 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 26 | * |
| 27 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 28 | * or visit www.oracle.com if you need additional information or have any |
| 29 | * questions. |
| 30 | */ |
| 31 | |
| 32 | #include "ti_class_definition.h" |
| 33 | |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 34 | #include "base/array_slice.h" |
Andreas Gampe | c6ea7d0 | 2017-02-01 16:46:28 -0800 | [diff] [blame] | 35 | #include "class_linker-inl.h" |
Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 36 | #include "dex_file.h" |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 37 | #include "fixed_up_dex_file.h" |
Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 38 | #include "handle_scope-inl.h" |
| 39 | #include "handle.h" |
Andreas Gampe | c6ea7d0 | 2017-02-01 16:46:28 -0800 | [diff] [blame] | 40 | #include "mirror/class_ext.h" |
Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 41 | #include "mirror/class-inl.h" |
| 42 | #include "mirror/object-inl.h" |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 43 | #include "reflection.h" |
Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 44 | #include "thread.h" |
| 45 | |
| 46 | namespace openjdkjvmti { |
| 47 | |
Alex Light | 4052847 | 2017-03-28 09:07:36 -0700 | [diff] [blame] | 48 | bool ArtClassDefinition::IsModified() const { |
| 49 | // RedefineClasses calls always are 'modified' since they need to change the original_dex_file of |
| 50 | // the class. |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 51 | if (redefined_) { |
Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 52 | return true; |
| 53 | } |
| 54 | // Check if the dex file we want to set is the same as the current one. |
Alex Light | 4052847 | 2017-03-28 09:07:36 -0700 | [diff] [blame] | 55 | // Unfortunately we need to do this check even if no modifications have been done since it could |
| 56 | // be that agents were removed in the mean-time so we still have a different dex file. The dex |
| 57 | // checksum means this is likely to be fairly fast. |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 58 | return static_cast<jint>(original_dex_file_.size()) != dex_len_ || |
Vladimir Marko | e1993c7 | 2017-06-14 17:01:38 +0100 | [diff] [blame^] | 59 | memcmp(original_dex_file_.data(), dex_data_.get(), dex_len_) != 0; |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | jvmtiError ArtClassDefinition::InitCommon(ArtJvmTiEnv* env, jclass klass) { |
| 63 | JNIEnv* jni_env = GetJniEnv(env); |
| 64 | if (jni_env == nullptr) { |
| 65 | return ERR(INTERNAL); |
| 66 | } |
| 67 | art::ScopedObjectAccess soa(jni_env); |
| 68 | art::ObjPtr<art::mirror::Class> m_klass(soa.Decode<art::mirror::Class>(klass)); |
| 69 | if (m_klass.IsNull()) { |
| 70 | return ERR(INVALID_CLASS); |
| 71 | } |
| 72 | klass_ = klass; |
| 73 | loader_ = soa.AddLocalReference<jobject>(m_klass->GetClassLoader()); |
| 74 | std::string descriptor_store; |
| 75 | std::string descriptor(m_klass->GetDescriptor(&descriptor_store)); |
| 76 | name_ = descriptor.substr(1, descriptor.size() - 2); |
| 77 | // Android doesn't really have protection domains. |
| 78 | protection_domain_ = nullptr; |
| 79 | return OK; |
| 80 | } |
| 81 | |
| 82 | // Gets the data surrounding the given class. |
| 83 | static jvmtiError GetDexDataForRetransformation(ArtJvmTiEnv* env, |
| 84 | art::Handle<art::mirror::Class> klass, |
| 85 | /*out*/jint* dex_data_len, |
| 86 | /*out*/unsigned char** dex_data) |
| 87 | REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| 88 | art::StackHandleScope<3> hs(art::Thread::Current()); |
| 89 | art::Handle<art::mirror::ClassExt> ext(hs.NewHandle(klass->GetExtData())); |
| 90 | const art::DexFile* dex_file = nullptr; |
| 91 | if (!ext.IsNull()) { |
| 92 | art::Handle<art::mirror::Object> orig_dex(hs.NewHandle(ext->GetOriginalDexFile())); |
| 93 | if (!orig_dex.IsNull()) { |
| 94 | if (orig_dex->IsArrayInstance()) { |
| 95 | DCHECK(orig_dex->GetClass()->GetComponentType()->IsPrimitiveByte()); |
| 96 | art::Handle<art::mirror::ByteArray> orig_dex_bytes( |
| 97 | hs.NewHandle(art::down_cast<art::mirror::ByteArray*>(orig_dex->AsArray()))); |
| 98 | *dex_data_len = static_cast<jint>(orig_dex_bytes->GetLength()); |
| 99 | return CopyDataIntoJvmtiBuffer( |
| 100 | env, |
| 101 | reinterpret_cast<const unsigned char*>(orig_dex_bytes->GetData()), |
| 102 | *dex_data_len, |
| 103 | /*out*/dex_data); |
| 104 | } else if (orig_dex->IsDexCache()) { |
| 105 | dex_file = orig_dex->AsDexCache()->GetDexFile(); |
| 106 | } else { |
Alex Light | 0ecb236 | 2017-04-12 09:01:47 -0700 | [diff] [blame] | 107 | DCHECK(orig_dex->GetClass()->DescriptorEquals("Ljava/lang/Long;")) |
| 108 | << "Expected java/lang/Long but found object of type " |
| 109 | << orig_dex->GetClass()->PrettyClass(); |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 110 | art::ObjPtr<art::mirror::Class> prim_long_class( |
| 111 | art::Runtime::Current()->GetClassLinker()->GetClassRoot( |
| 112 | art::ClassLinker::kPrimitiveLong)); |
| 113 | art::JValue val; |
| 114 | if (!art::UnboxPrimitiveForResult(orig_dex.Get(), prim_long_class, &val)) { |
| 115 | // This should never happen. |
| 116 | return ERR(INTERNAL); |
| 117 | } |
| 118 | dex_file = reinterpret_cast<const art::DexFile*>(static_cast<uintptr_t>(val.GetJ())); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | if (dex_file == nullptr) { |
| 123 | dex_file = &klass->GetDexFile(); |
| 124 | } |
| 125 | std::unique_ptr<FixedUpDexFile> fixed_dex_file(FixedUpDexFile::Create(*dex_file)); |
| 126 | *dex_data_len = static_cast<jint>(fixed_dex_file->Size()); |
| 127 | return CopyDataIntoJvmtiBuffer(env, |
| 128 | fixed_dex_file->Begin(), |
| 129 | fixed_dex_file->Size(), |
| 130 | /*out*/dex_data); |
| 131 | } |
| 132 | |
| 133 | jvmtiError ArtClassDefinition::Init(ArtJvmTiEnv* env, jclass klass) { |
| 134 | jvmtiError res = InitCommon(env, klass); |
| 135 | if (res != OK) { |
| 136 | return res; |
| 137 | } |
| 138 | unsigned char* new_data = nullptr; |
| 139 | art::Thread* self = art::Thread::Current(); |
| 140 | art::ScopedObjectAccess soa(self); |
| 141 | art::StackHandleScope<1> hs(self); |
| 142 | art::Handle<art::mirror::Class> m_klass(hs.NewHandle(self->DecodeJObject(klass)->AsClass())); |
| 143 | res = GetDexDataForRetransformation(env, m_klass, &dex_len_, &new_data); |
| 144 | if (res != OK) { |
| 145 | return res; |
| 146 | } |
| 147 | dex_data_ = MakeJvmtiUniquePtr(env, new_data); |
| 148 | if (m_klass->GetExtData() == nullptr || m_klass->GetExtData()->GetOriginalDexFile() == nullptr) { |
| 149 | // We have never redefined class this yet. Keep track of what the (de-quickened) dex file looks |
| 150 | // like so we can tell if anything has changed. Really we would like to just always do the |
| 151 | // 'else' block but the fact that we de-quickened stuff screws us over. |
| 152 | unsigned char* original_data_memory = nullptr; |
| 153 | res = CopyDataIntoJvmtiBuffer(env, dex_data_.get(), dex_len_, &original_data_memory); |
| 154 | original_dex_file_memory_ = MakeJvmtiUniquePtr(env, original_data_memory); |
Vladimir Marko | e1993c7 | 2017-06-14 17:01:38 +0100 | [diff] [blame^] | 155 | original_dex_file_ = art::ArrayRef<const unsigned char>(original_data_memory, dex_len_); |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 156 | } else { |
| 157 | // We know that we have been redefined at least once (there is an original_dex_file set in |
| 158 | // the class) so we can just use the current dex file directly. |
| 159 | const art::DexFile& dex_file = m_klass->GetDexFile(); |
Vladimir Marko | e1993c7 | 2017-06-14 17:01:38 +0100 | [diff] [blame^] | 160 | original_dex_file_ = art::ArrayRef<const unsigned char>(dex_file.Begin(), dex_file.Size()); |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 161 | } |
| 162 | return res; |
| 163 | } |
| 164 | |
| 165 | jvmtiError ArtClassDefinition::Init(ArtJvmTiEnv* env, const jvmtiClassDefinition& def) { |
| 166 | jvmtiError res = InitCommon(env, def.klass); |
| 167 | if (res != OK) { |
| 168 | return res; |
| 169 | } |
| 170 | unsigned char* new_data = nullptr; |
Vladimir Marko | e1993c7 | 2017-06-14 17:01:38 +0100 | [diff] [blame^] | 171 | original_dex_file_ = art::ArrayRef<const unsigned char>(def.class_bytes, def.class_byte_count); |
Alex Light | b7354d5 | 2017-03-30 15:17:01 -0700 | [diff] [blame] | 172 | redefined_ = true; |
| 173 | dex_len_ = def.class_byte_count; |
| 174 | res = CopyDataIntoJvmtiBuffer(env, def.class_bytes, def.class_byte_count, /*out*/ &new_data); |
| 175 | dex_data_ = MakeJvmtiUniquePtr(env, new_data); |
| 176 | return res; |
Alex Light | a7e38d8 | 2017-01-19 14:57:28 -0800 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | } // namespace openjdkjvmti |