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/* 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 "art_jvmti.h"
#include "class_table-inl.h"
#include "class_linker.h"
#include "jni_internal.h"
#include "runtime.h"
#include "scoped_thread_state_change-inl.h"
#include "thread-inl.h"
namespace openjdkjvmti {
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);
}
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);
}
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 sig_copy;
if (signature_ptr != nullptr) {
std::string storage;
const char* descriptor = klass->GetDescriptor(&storage);
unsigned char* tmp;
jvmtiError ret = CopyString(env, descriptor, &tmp);
if (ret != ERR(NONE)) {
return ret;
}
sig_copy = MakeJvmtiUniquePtr(env, tmp);
*signature_ptr = reinterpret_cast<char*>(tmp);
}
// TODO: Support generic signature.
*generic_ptr = nullptr;
// 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);
}
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);
}
} // namespace openjdkjvmti