1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* 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_definition.h"
#include "base/array_slice.h"
#include "class_linker-inl.h"
#include "dex_file.h"
#include "fixed_up_dex_file.h"
#include "handle.h"
#include "handle_scope-inl.h"
#include "mirror/class-inl.h"
#include "mirror/class_ext.h"
#include "mirror/object-inl.h"
#include "reflection.h"
#include "thread.h"
namespace openjdkjvmti {
bool ArtClassDefinition::IsModified() const {
// RedefineClasses calls always are 'modified' since they need to change the original_dex_file of
// the class.
if (redefined_) {
return true;
}
// Check if the dex file we want to set is the same as the current one.
// Unfortunately we need to do this check even if no modifications have been done since it could
// be that agents were removed in the mean-time so we still have a different dex file. The dex
// checksum means this is likely to be fairly fast.
return static_cast<jint>(original_dex_file_.size()) != dex_len_ ||
memcmp(original_dex_file_.data(), dex_data_.get(), dex_len_) != 0;
}
jvmtiError ArtClassDefinition::InitCommon(ArtJvmTiEnv* env, jclass klass) {
JNIEnv* jni_env = GetJniEnv(env);
if (jni_env == nullptr) {
return ERR(INTERNAL);
}
art::ScopedObjectAccess soa(jni_env);
art::ObjPtr<art::mirror::Class> m_klass(soa.Decode<art::mirror::Class>(klass));
if (m_klass.IsNull()) {
return ERR(INVALID_CLASS);
}
klass_ = klass;
loader_ = soa.AddLocalReference<jobject>(m_klass->GetClassLoader());
std::string descriptor_store;
std::string descriptor(m_klass->GetDescriptor(&descriptor_store));
name_ = descriptor.substr(1, descriptor.size() - 2);
// Android doesn't really have protection domains.
protection_domain_ = nullptr;
return OK;
}
// Gets the data surrounding the given class.
static jvmtiError GetDexDataForRetransformation(ArtJvmTiEnv* env,
art::Handle<art::mirror::Class> klass,
/*out*/jint* dex_data_len,
/*out*/unsigned char** dex_data)
REQUIRES_SHARED(art::Locks::mutator_lock_) {
art::StackHandleScope<3> hs(art::Thread::Current());
art::Handle<art::mirror::ClassExt> ext(hs.NewHandle(klass->GetExtData()));
const art::DexFile* dex_file = nullptr;
if (!ext.IsNull()) {
art::Handle<art::mirror::Object> orig_dex(hs.NewHandle(ext->GetOriginalDexFile()));
if (!orig_dex.IsNull()) {
if (orig_dex->IsArrayInstance()) {
DCHECK(orig_dex->GetClass()->GetComponentType()->IsPrimitiveByte());
art::Handle<art::mirror::ByteArray> orig_dex_bytes(
hs.NewHandle(art::down_cast<art::mirror::ByteArray*>(orig_dex->AsArray())));
*dex_data_len = static_cast<jint>(orig_dex_bytes->GetLength());
return CopyDataIntoJvmtiBuffer(
env,
reinterpret_cast<const unsigned char*>(orig_dex_bytes->GetData()),
*dex_data_len,
/*out*/dex_data);
} else if (orig_dex->IsDexCache()) {
dex_file = orig_dex->AsDexCache()->GetDexFile();
} else {
DCHECK(orig_dex->GetClass()->DescriptorEquals("Ljava/lang/Long;"))
<< "Expected java/lang/Long but found object of type "
<< orig_dex->GetClass()->PrettyClass();
art::ObjPtr<art::mirror::Class> prim_long_class(
art::Runtime::Current()->GetClassLinker()->GetClassRoot(
art::ClassLinker::kPrimitiveLong));
art::JValue val;
if (!art::UnboxPrimitiveForResult(orig_dex.Get(), prim_long_class, &val)) {
// This should never happen.
return ERR(INTERNAL);
}
dex_file = reinterpret_cast<const art::DexFile*>(static_cast<uintptr_t>(val.GetJ()));
}
}
}
if (dex_file == nullptr) {
dex_file = &klass->GetDexFile();
}
std::unique_ptr<FixedUpDexFile> fixed_dex_file(FixedUpDexFile::Create(*dex_file));
*dex_data_len = static_cast<jint>(fixed_dex_file->Size());
return CopyDataIntoJvmtiBuffer(env,
fixed_dex_file->Begin(),
fixed_dex_file->Size(),
/*out*/dex_data);
}
jvmtiError ArtClassDefinition::Init(ArtJvmTiEnv* env, jclass klass) {
jvmtiError res = InitCommon(env, klass);
if (res != OK) {
return res;
}
unsigned char* new_data = nullptr;
art::Thread* self = art::Thread::Current();
art::ScopedObjectAccess soa(self);
art::StackHandleScope<1> hs(self);
art::Handle<art::mirror::Class> m_klass(hs.NewHandle(self->DecodeJObject(klass)->AsClass()));
res = GetDexDataForRetransformation(env, m_klass, &dex_len_, &new_data);
if (res != OK) {
return res;
}
dex_data_ = MakeJvmtiUniquePtr(env, new_data);
if (m_klass->GetExtData() == nullptr || m_klass->GetExtData()->GetOriginalDexFile() == nullptr) {
// We have never redefined class this yet. Keep track of what the (de-quickened) dex file looks
// like so we can tell if anything has changed. Really we would like to just always do the
// 'else' block but the fact that we de-quickened stuff screws us over.
unsigned char* original_data_memory = nullptr;
res = CopyDataIntoJvmtiBuffer(env, dex_data_.get(), dex_len_, &original_data_memory);
original_dex_file_memory_ = MakeJvmtiUniquePtr(env, original_data_memory);
original_dex_file_ = art::ArrayRef<const unsigned char>(original_data_memory, dex_len_);
} else {
// We know that we have been redefined at least once (there is an original_dex_file set in
// the class) so we can just use the current dex file directly.
const art::DexFile& dex_file = m_klass->GetDexFile();
original_dex_file_ = art::ArrayRef<const unsigned char>(dex_file.Begin(), dex_file.Size());
}
return res;
}
jvmtiError ArtClassDefinition::Init(ArtJvmTiEnv* env, const jvmtiClassDefinition& def) {
jvmtiError res = InitCommon(env, def.klass);
if (res != OK) {
return res;
}
unsigned char* new_data = nullptr;
original_dex_file_ = art::ArrayRef<const unsigned char>(def.class_bytes, def.class_byte_count);
redefined_ = true;
dex_len_ = def.class_byte_count;
res = CopyDataIntoJvmtiBuffer(env, def.class_bytes, def.class_byte_count, /*out*/ &new_data);
dex_data_ = MakeJvmtiUniquePtr(env, new_data);
return res;
}
} // namespace openjdkjvmti
|
