/* 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 "art_field-inl.h"
#include "art_jvmti.h"
#include "base/enums.h"
#include "dex/dex_file_annotations.h"
#include "dex/modifiers.h"
#include "jni_internal.h"
#include "mirror/object_array-inl.h"
#include "scoped_thread_state_change-inl.h"
#include "thread-current-inl.h"
namespace openjdkjvmti {
// 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::mirror::ObjectArray<art::mirror::String>* str_array =
art::annotations::GetSignatureAnnotationForField(art_field);
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.
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