/* 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_method.h"
#include "art_jvmti.h"
#include "art_method-inl.h"
#include "base/enums.h"
#include "dex_file_annotations.h"
#include "events-inl.h"
#include "jni_internal.h"
#include "mirror/object_array-inl.h"
#include "modifiers.h"
#include "runtime_callbacks.h"
#include "scoped_thread_state_change-inl.h"
#include "ScopedLocalRef.h"
#include "thread-inl.h"
#include "thread_list.h"
#include "ti_phase.h"
namespace openjdkjvmti {
struct TiMethodCallback : public art::MethodCallback {
void RegisterNativeMethod(art::ArtMethod* method,
const void* cur_method,
/*out*/void** new_method)
OVERRIDE REQUIRES_SHARED(art::Locks::mutator_lock_) {
if (event_handler->IsEventEnabledAnywhere(ArtJvmtiEvent::kNativeMethodBind)) {
art::Thread* thread = art::Thread::Current();
art::JNIEnvExt* jnienv = thread->GetJniEnv();
ScopedLocalRef<jthread> thread_jni(
jnienv, PhaseUtil::IsLivePhase() ? jnienv->AddLocalReference<jthread>(thread->GetPeer())
: nullptr);
art::ScopedThreadSuspension sts(thread, art::ThreadState::kNative);
event_handler->DispatchEvent<ArtJvmtiEvent::kNativeMethodBind>(
thread,
static_cast<JNIEnv*>(jnienv),
thread_jni.get(),
art::jni::EncodeArtMethod(method),
const_cast<void*>(cur_method),
new_method);
}
}
EventHandler* event_handler = nullptr;
};
TiMethodCallback gMethodCallback;
void MethodUtil::Register(EventHandler* handler) {
gMethodCallback.event_handler = handler;
art::ScopedThreadStateChange stsc(art::Thread::Current(),
art::ThreadState::kWaitingForDebuggerToAttach);
art::ScopedSuspendAll ssa("Add method callback");
art::Runtime::Current()->GetRuntimeCallbacks()->AddMethodCallback(&gMethodCallback);
}
void MethodUtil::Unregister() {
art::ScopedThreadStateChange stsc(art::Thread::Current(),
art::ThreadState::kWaitingForDebuggerToAttach);
art::ScopedSuspendAll ssa("Remove method callback");
art::Runtime* runtime = art::Runtime::Current();
runtime->GetRuntimeCallbacks()->RemoveMethodCallback(&gMethodCallback);
}
jvmtiError MethodUtil::GetArgumentsSize(jvmtiEnv* env ATTRIBUTE_UNUSED,
jmethodID method,
jint* size_ptr) {
if (method == nullptr) {
return ERR(INVALID_METHODID);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
if (art_method->IsNative()) {
return ERR(NATIVE_METHOD);
}
if (size_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::ScopedObjectAccess soa(art::Thread::Current());
if (art_method->IsProxyMethod() || art_method->IsAbstract()) {
// Use the shorty.
art::ArtMethod* base_method = art_method->GetInterfaceMethodIfProxy(art::kRuntimePointerSize);
size_t arg_count = art::ArtMethod::NumArgRegisters(base_method->GetShorty());
if (!base_method->IsStatic()) {
arg_count++;
}
*size_ptr = static_cast<jint>(arg_count);
return ERR(NONE);
}
DCHECK_NE(art_method->GetCodeItemOffset(), 0u);
*size_ptr = art_method->GetCodeItem()->ins_size_;
return ERR(NONE);
}
jvmtiError MethodUtil::GetMaxLocals(jvmtiEnv* env ATTRIBUTE_UNUSED,
jmethodID method,
jint* max_ptr) {
if (method == nullptr) {
return ERR(INVALID_METHODID);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
if (art_method->IsNative()) {
return ERR(NATIVE_METHOD);
}
if (max_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::ScopedObjectAccess soa(art::Thread::Current());
if (art_method->IsProxyMethod() || art_method->IsAbstract()) {
// This isn't specified as an error case, so return 0.
*max_ptr = 0;
return ERR(NONE);
}
DCHECK_NE(art_method->GetCodeItemOffset(), 0u);
*max_ptr = art_method->GetCodeItem()->registers_size_;
return ERR(NONE);
}
jvmtiError MethodUtil::GetMethodName(jvmtiEnv* env,
jmethodID method,
char** name_ptr,
char** signature_ptr,
char** generic_ptr) {
art::ScopedObjectAccess soa(art::Thread::Current());
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
art_method = art_method->GetInterfaceMethodIfProxy(art::kRuntimePointerSize);
JvmtiUniquePtr<char[]> name_copy;
if (name_ptr != nullptr) {
const char* method_name = art_method->GetName();
if (method_name == nullptr) {
method_name = "<error>";
}
jvmtiError ret;
name_copy = CopyString(env, method_name, &ret);
if (name_copy == nullptr) {
return ret;
}
*name_ptr = name_copy.get();
}
JvmtiUniquePtr<char[]> signature_copy;
if (signature_ptr != nullptr) {
const art::Signature sig = art_method->GetSignature();
std::string str = sig.ToString();
jvmtiError ret;
signature_copy = CopyString(env, str.c_str(), &ret);
if (signature_copy == nullptr) {
return ret;
}
*signature_ptr = signature_copy.get();
}
if (generic_ptr != nullptr) {
*generic_ptr = nullptr;
if (!art_method->GetDeclaringClass()->IsProxyClass()) {
art::mirror::ObjectArray<art::mirror::String>* str_array =
art::annotations::GetSignatureAnnotationForMethod(art_method);
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[]> generic_copy = CopyString(env, output_string.c_str(), &ret);
if (generic_copy == nullptr) {
return ret;
}
*generic_ptr = generic_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 MethodUtil::GetMethodDeclaringClass(jvmtiEnv* env ATTRIBUTE_UNUSED,
jmethodID method,
jclass* declaring_class_ptr) {
if (declaring_class_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
// Note: No GetInterfaceMethodIfProxy, we want to actual class.
art::ScopedObjectAccess soa(art::Thread::Current());
art::mirror::Class* klass = art_method->GetDeclaringClass();
*declaring_class_ptr = soa.AddLocalReference<jclass>(klass);
return ERR(NONE);
}
jvmtiError MethodUtil::GetMethodLocation(jvmtiEnv* env ATTRIBUTE_UNUSED,
jmethodID method,
jlocation* start_location_ptr,
jlocation* end_location_ptr) {
if (method == nullptr) {
return ERR(INVALID_METHODID);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
if (art_method->IsNative()) {
return ERR(NATIVE_METHOD);
}
if (start_location_ptr == nullptr || end_location_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::ScopedObjectAccess soa(art::Thread::Current());
if (art_method->IsProxyMethod() || art_method->IsAbstract()) {
// This isn't specified as an error case, so return -1/-1 as the RI does.
*start_location_ptr = -1;
*end_location_ptr = -1;
return ERR(NONE);
}
DCHECK_NE(art_method->GetCodeItemOffset(), 0u);
*start_location_ptr = 0;
*end_location_ptr = art_method->GetCodeItem()->insns_size_in_code_units_ - 1;
return ERR(NONE);
}
jvmtiError MethodUtil::GetMethodModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED,
jmethodID method,
jint* modifiers_ptr) {
if (modifiers_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
uint32_t modifiers = art_method->GetAccessFlags();
// Note: Keep this code in sync with Executable.fixMethodFlags.
if ((modifiers & art::kAccAbstract) != 0) {
modifiers &= ~art::kAccNative;
}
modifiers &= ~art::kAccSynchronized;
if ((modifiers & art::kAccDeclaredSynchronized) != 0) {
modifiers |= art::kAccSynchronized;
}
modifiers &= art::kAccJavaFlagsMask;
*modifiers_ptr = modifiers;
return ERR(NONE);
}
using LineNumberContext = std::vector<jvmtiLineNumberEntry>;
static bool CollectLineNumbers(void* void_context, const art::DexFile::PositionInfo& entry) {
LineNumberContext* context = reinterpret_cast<LineNumberContext*>(void_context);
jvmtiLineNumberEntry jvmti_entry = { static_cast<jlocation>(entry.address_),
static_cast<jint>(entry.line_) };
context->push_back(jvmti_entry);
return false; // Collect all, no early exit.
}
jvmtiError MethodUtil::GetLineNumberTable(jvmtiEnv* env,
jmethodID method,
jint* entry_count_ptr,
jvmtiLineNumberEntry** table_ptr) {
if (method == nullptr) {
return ERR(NULL_POINTER);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
DCHECK(!art_method->IsRuntimeMethod());
const art::DexFile::CodeItem* code_item;
const art::DexFile* dex_file;
{
art::ScopedObjectAccess soa(art::Thread::Current());
if (art_method->IsProxyMethod()) {
return ERR(ABSENT_INFORMATION);
}
if (art_method->IsNative()) {
return ERR(NATIVE_METHOD);
}
if (entry_count_ptr == nullptr || table_ptr == nullptr) {
return ERR(NULL_POINTER);
}
code_item = art_method->GetCodeItem();
dex_file = art_method->GetDexFile();
DCHECK(code_item != nullptr) << art_method->PrettyMethod() << " " << dex_file->GetLocation();
}
LineNumberContext context;
bool success = dex_file->DecodeDebugPositionInfo(code_item, CollectLineNumbers, &context);
if (!success) {
return ERR(ABSENT_INFORMATION);
}
unsigned char* data;
jlong mem_size = context.size() * sizeof(jvmtiLineNumberEntry);
jvmtiError alloc_error = env->Allocate(mem_size, &data);
if (alloc_error != ERR(NONE)) {
return alloc_error;
}
*table_ptr = reinterpret_cast<jvmtiLineNumberEntry*>(data);
memcpy(*table_ptr, context.data(), mem_size);
*entry_count_ptr = static_cast<jint>(context.size());
return ERR(NONE);
}
template <typename T>
static jvmtiError IsMethodT(jvmtiEnv* env ATTRIBUTE_UNUSED,
jmethodID method,
T test,
jboolean* is_t_ptr) {
if (method == nullptr) {
return ERR(INVALID_METHODID);
}
if (is_t_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::ArtMethod* art_method = art::jni::DecodeArtMethod(method);
*is_t_ptr = test(art_method) ? JNI_TRUE : JNI_FALSE;
return ERR(NONE);
}
jvmtiError MethodUtil::IsMethodNative(jvmtiEnv* env, jmethodID m, jboolean* is_native_ptr) {
auto test = [](art::ArtMethod* method) {
return method->IsNative();
};
return IsMethodT(env, m, test, is_native_ptr);
}
jvmtiError MethodUtil::IsMethodObsolete(jvmtiEnv* env, jmethodID m, jboolean* is_obsolete_ptr) {
auto test = [](art::ArtMethod* method) {
return method->IsObsolete();
};
return IsMethodT(env, m, test, is_obsolete_ptr);
}
jvmtiError MethodUtil::IsMethodSynthetic(jvmtiEnv* env, jmethodID m, jboolean* is_synthetic_ptr) {
auto test = [](art::ArtMethod* method) {
return method->IsSynthetic();
};
return IsMethodT(env, m, test, is_synthetic_ptr);
}
} // namespace openjdkjvmti