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allwinner_a64/android/art/runtime/openjdkjvmti/ti_stack.cc
August b9e30e05b1 upload android base code part3
2018-08-08 16:48:17 +08:00

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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_stack.h"
#include <algorithm>
#include <list>
#include <unordered_map>
#include <vector>
#include "art_field-inl.h"
#include "art_jvmti.h"
#include "art_method-inl.h"
#include "barrier.h"
#include "base/bit_utils.h"
#include "base/enums.h"
#include "base/mutex.h"
#include "dex_file.h"
#include "dex_file_annotations.h"
#include "handle_scope-inl.h"
#include "jni_env_ext.h"
#include "jni_internal.h"
#include "mirror/class.h"
#include "mirror/dex_cache.h"
#include "nativehelper/ScopedLocalRef.h"
#include "scoped_thread_state_change-inl.h"
#include "stack.h"
#include "thread-current-inl.h"
#include "thread_list.h"
#include "thread_pool.h"
#include "well_known_classes.h"
namespace openjdkjvmti {
template <typename FrameFn>
struct GetStackTraceVisitor : public art::StackVisitor {
GetStackTraceVisitor(art::Thread* thread_in,
size_t start_,
size_t stop_,
FrameFn fn_)
: StackVisitor(thread_in, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames),
fn(fn_),
start(start_),
stop(stop_) {}
GetStackTraceVisitor(const GetStackTraceVisitor&) = default;
GetStackTraceVisitor(GetStackTraceVisitor&&) = default;
bool VisitFrame() REQUIRES_SHARED(art::Locks::mutator_lock_) {
art::ArtMethod* m = GetMethod();
if (m->IsRuntimeMethod()) {
return true;
}
if (start == 0) {
m = m->GetInterfaceMethodIfProxy(art::kRuntimePointerSize);
jmethodID id = art::jni::EncodeArtMethod(m);
uint32_t dex_pc = GetDexPc(false);
jlong dex_location = (dex_pc == art::DexFile::kDexNoIndex) ? -1 : static_cast<jlong>(dex_pc);
jvmtiFrameInfo info = { id, dex_location };
fn(info);
if (stop == 1) {
return false; // We're done.
} else if (stop > 0) {
stop--;
}
} else {
start--;
}
return true;
}
FrameFn fn;
size_t start;
size_t stop;
};
template <typename FrameFn>
GetStackTraceVisitor<FrameFn> MakeStackTraceVisitor(art::Thread* thread_in,
size_t start,
size_t stop,
FrameFn fn) {
return GetStackTraceVisitor<FrameFn>(thread_in, start, stop, fn);
}
struct GetStackTraceVectorClosure : public art::Closure {
public:
GetStackTraceVectorClosure(size_t start, size_t stop)
: start_input(start),
stop_input(stop),
start_result(0),
stop_result(0) {}
void Run(art::Thread* self) OVERRIDE REQUIRES_SHARED(art::Locks::mutator_lock_) {
auto frames_fn = [&](jvmtiFrameInfo info) {
frames.push_back(info);
};
auto visitor = MakeStackTraceVisitor(self, start_input, stop_input, frames_fn);
visitor.WalkStack(/* include_transitions */ false);
start_result = visitor.start;
stop_result = visitor.stop;
}
const size_t start_input;
const size_t stop_input;
std::vector<jvmtiFrameInfo> frames;
size_t start_result;
size_t stop_result;
};
static jvmtiError TranslateFrameVector(const std::vector<jvmtiFrameInfo>& frames,
jint start_depth,
size_t start_result,
jint max_frame_count,
jvmtiFrameInfo* frame_buffer,
jint* count_ptr) {
size_t collected_frames = frames.size();
// Assume we're here having collected something.
DCHECK_GT(max_frame_count, 0);
// Frames from the top.
if (start_depth >= 0) {
if (start_result != 0) {
// Not enough frames.
return ERR(ILLEGAL_ARGUMENT);
}
DCHECK_LE(collected_frames, static_cast<size_t>(max_frame_count));
if (frames.size() > 0) {
memcpy(frame_buffer, frames.data(), collected_frames * sizeof(jvmtiFrameInfo));
}
*count_ptr = static_cast<jint>(frames.size());
return ERR(NONE);
}
// Frames from the bottom.
if (collected_frames < static_cast<size_t>(-start_depth)) {
return ERR(ILLEGAL_ARGUMENT);
}
size_t count = std::min(static_cast<size_t>(-start_depth), static_cast<size_t>(max_frame_count));
memcpy(frame_buffer,
&frames.data()[collected_frames + start_depth],
count * sizeof(jvmtiFrameInfo));
*count_ptr = static_cast<jint>(count);
return ERR(NONE);
}
struct GetStackTraceDirectClosure : public art::Closure {
public:
GetStackTraceDirectClosure(jvmtiFrameInfo* frame_buffer_, size_t start, size_t stop)
: frame_buffer(frame_buffer_),
start_input(start),
stop_input(stop),
index(0) {
DCHECK_GE(start_input, 0u);
}
void Run(art::Thread* self) OVERRIDE REQUIRES_SHARED(art::Locks::mutator_lock_) {
auto frames_fn = [&](jvmtiFrameInfo info) {
frame_buffer[index] = info;
++index;
};
auto visitor = MakeStackTraceVisitor(self, start_input, stop_input, frames_fn);
visitor.WalkStack(/* include_transitions */ false);
}
jvmtiFrameInfo* frame_buffer;
const size_t start_input;
const size_t stop_input;
size_t index = 0;
};
static jvmtiError GetThread(JNIEnv* env,
art::ScopedObjectAccessAlreadyRunnable& soa,
jthread java_thread,
art::Thread** thread)
REQUIRES_SHARED(art::Locks::mutator_lock_) // Needed for FromManagedThread.
REQUIRES(art::Locks::thread_list_lock_) { // Needed for FromManagedThread.
if (java_thread == nullptr) {
*thread = art::Thread::Current();
if (*thread == nullptr) {
// GetStackTrace can only be run during the live phase, so the current thread should be
// attached and thus available. Getting a null for current means we're starting up or
// dying.
return ERR(WRONG_PHASE);
}
} else {
if (!env->IsInstanceOf(java_thread, art::WellKnownClasses::java_lang_Thread)) {
return ERR(INVALID_THREAD);
}
// TODO: Need non-aborting call here, to return JVMTI_ERROR_INVALID_THREAD.
*thread = art::Thread::FromManagedThread(soa, java_thread);
if (*thread == nullptr) {
return ERR(THREAD_NOT_ALIVE);
}
}
return ERR(NONE);
}
jvmtiError StackUtil::GetStackTrace(jvmtiEnv* jvmti_env ATTRIBUTE_UNUSED,
jthread java_thread,
jint start_depth,
jint max_frame_count,
jvmtiFrameInfo* frame_buffer,
jint* count_ptr) {
// It is not great that we have to hold these locks for so long, but it is necessary to ensure
// that the thread isn't dying on us.
art::ScopedObjectAccess soa(art::Thread::Current());
art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
art::Thread* thread;
jvmtiError thread_error = GetThread(art::Thread::Current()->GetJniEnv(),
soa,
java_thread,
&thread);
if (thread_error != ERR(NONE)) {
return thread_error;
}
DCHECK(thread != nullptr);
art::ThreadState state = thread->GetState();
if (state == art::ThreadState::kStarting ||
state == art::ThreadState::kTerminated ||
thread->IsStillStarting()) {
return ERR(THREAD_NOT_ALIVE);
}
if (max_frame_count < 0) {
return ERR(ILLEGAL_ARGUMENT);
}
if (frame_buffer == nullptr || count_ptr == nullptr) {
return ERR(NULL_POINTER);
}
if (max_frame_count == 0) {
*count_ptr = 0;
return ERR(NONE);
}
if (start_depth >= 0) {
// Fast path: Regular order of stack trace. Fill into the frame_buffer directly.
GetStackTraceDirectClosure closure(frame_buffer,
static_cast<size_t>(start_depth),
static_cast<size_t>(max_frame_count));
thread->RequestSynchronousCheckpoint(&closure);
*count_ptr = static_cast<jint>(closure.index);
if (closure.index < static_cast<size_t>(start_depth)) {
return ERR(ILLEGAL_ARGUMENT);
}
return ERR(NONE);
}
GetStackTraceVectorClosure closure(0, 0);
thread->RequestSynchronousCheckpoint(&closure);
return TranslateFrameVector(closure.frames,
start_depth,
closure.start_result,
max_frame_count,
frame_buffer,
count_ptr);
}
template <typename Data>
struct GetAllStackTracesVectorClosure : public art::Closure {
GetAllStackTracesVectorClosure(size_t stop, Data* data_)
: barrier(0), stop_input(stop), data(data_) {}
void Run(art::Thread* thread) OVERRIDE
REQUIRES_SHARED(art::Locks::mutator_lock_)
REQUIRES(!data->mutex) {
art::Thread* self = art::Thread::Current();
Work(thread, self);
barrier.Pass(self);
}
void Work(art::Thread* thread, art::Thread* self)
REQUIRES_SHARED(art::Locks::mutator_lock_)
REQUIRES(!data->mutex) {
// Skip threads that are still starting.
if (thread->IsStillStarting()) {
return;
}
std::vector<jvmtiFrameInfo>* thread_frames = data->GetFrameStorageFor(self, thread);
if (thread_frames == nullptr) {
return;
}
// Now collect the data.
auto frames_fn = [&](jvmtiFrameInfo info) {
thread_frames->push_back(info);
};
auto visitor = MakeStackTraceVisitor(thread, 0u, stop_input, frames_fn);
visitor.WalkStack(/* include_transitions */ false);
}
art::Barrier barrier;
const size_t stop_input;
Data* data;
};
template <typename Data>
static void RunCheckpointAndWait(Data* data, size_t max_frame_count) {
GetAllStackTracesVectorClosure<Data> closure(max_frame_count, data);
size_t barrier_count = art::Runtime::Current()->GetThreadList()->RunCheckpoint(&closure, nullptr);
if (barrier_count == 0) {
return;
}
art::Thread* self = art::Thread::Current();
art::ScopedThreadStateChange tsc(self, art::ThreadState::kWaitingForCheckPointsToRun);
closure.barrier.Increment(self, barrier_count);
}
jvmtiError StackUtil::GetAllStackTraces(jvmtiEnv* env,
jint max_frame_count,
jvmtiStackInfo** stack_info_ptr,
jint* thread_count_ptr) {
if (max_frame_count < 0) {
return ERR(ILLEGAL_ARGUMENT);
}
if (stack_info_ptr == nullptr || thread_count_ptr == nullptr) {
return ERR(NULL_POINTER);
}
struct AllStackTracesData {
AllStackTracesData() : mutex("GetAllStackTraces", art::LockLevel::kAbortLock) {}
~AllStackTracesData() {
JNIEnv* jni_env = art::Thread::Current()->GetJniEnv();
for (jthread global_thread_ref : thread_peers) {
jni_env->DeleteGlobalRef(global_thread_ref);
}
}
std::vector<jvmtiFrameInfo>* GetFrameStorageFor(art::Thread* self, art::Thread* thread)
REQUIRES_SHARED(art::Locks::mutator_lock_)
REQUIRES(!mutex) {
art::MutexLock mu(self, mutex);
threads.push_back(thread);
jthread peer = art::Runtime::Current()->GetJavaVM()->AddGlobalRef(
self, thread->GetPeerFromOtherThread());
thread_peers.push_back(peer);
frames.emplace_back(new std::vector<jvmtiFrameInfo>());
return frames.back().get();
}
art::Mutex mutex;
// Storage. Only access directly after completion.
std::vector<art::Thread*> threads;
// "thread_peers" contains global references to their peers.
std::vector<jthread> thread_peers;
std::vector<std::unique_ptr<std::vector<jvmtiFrameInfo>>> frames;
};
AllStackTracesData data;
RunCheckpointAndWait(&data, static_cast<size_t>(max_frame_count));
art::Thread* current = art::Thread::Current();
// Convert the data into our output format.
// Note: we use an array of jvmtiStackInfo for convenience. The spec says we need to
// allocate one big chunk for this and the actual frames, which means we need
// to either be conservative or rearrange things later (the latter is implemented).
std::unique_ptr<jvmtiStackInfo[]> stack_info_array(new jvmtiStackInfo[data.frames.size()]);
std::vector<std::unique_ptr<jvmtiFrameInfo[]>> frame_infos;
frame_infos.reserve(data.frames.size());
// Now run through and add data for each thread.
size_t sum_frames = 0;
for (size_t index = 0; index < data.frames.size(); ++index) {
jvmtiStackInfo& stack_info = stack_info_array.get()[index];
memset(&stack_info, 0, sizeof(jvmtiStackInfo));
const std::vector<jvmtiFrameInfo>& thread_frames = *data.frames[index].get();
// For the time being, set the thread to null. We'll fix it up in the second stage.
stack_info.thread = nullptr;
stack_info.state = JVMTI_THREAD_STATE_SUSPENDED;
size_t collected_frames = thread_frames.size();
if (max_frame_count == 0 || collected_frames == 0) {
stack_info.frame_count = 0;
stack_info.frame_buffer = nullptr;
continue;
}
DCHECK_LE(collected_frames, static_cast<size_t>(max_frame_count));
jvmtiFrameInfo* frame_info = new jvmtiFrameInfo[collected_frames];
frame_infos.emplace_back(frame_info);
jint count;
jvmtiError translate_result = TranslateFrameVector(thread_frames,
0,
0,
static_cast<jint>(collected_frames),
frame_info,
&count);
DCHECK(translate_result == JVMTI_ERROR_NONE);
stack_info.frame_count = static_cast<jint>(collected_frames);
stack_info.frame_buffer = frame_info;
sum_frames += static_cast<size_t>(count);
}
// No errors, yet. Now put it all into an output buffer.
size_t rounded_stack_info_size = art::RoundUp(sizeof(jvmtiStackInfo) * data.frames.size(),
alignof(jvmtiFrameInfo));
size_t chunk_size = rounded_stack_info_size + sum_frames * sizeof(jvmtiFrameInfo);
unsigned char* chunk_data;
jvmtiError alloc_result = env->Allocate(chunk_size, &chunk_data);
if (alloc_result != ERR(NONE)) {
return alloc_result;
}
jvmtiStackInfo* stack_info = reinterpret_cast<jvmtiStackInfo*>(chunk_data);
// First copy in all the basic data.
memcpy(stack_info, stack_info_array.get(), sizeof(jvmtiStackInfo) * data.frames.size());
// Now copy the frames and fix up the pointers.
jvmtiFrameInfo* frame_info = reinterpret_cast<jvmtiFrameInfo*>(
chunk_data + rounded_stack_info_size);
for (size_t i = 0; i < data.frames.size(); ++i) {
jvmtiStackInfo& old_stack_info = stack_info_array.get()[i];
jvmtiStackInfo& new_stack_info = stack_info[i];
// Translate the global ref into a local ref.
new_stack_info.thread =
static_cast<JNIEnv*>(current->GetJniEnv())->NewLocalRef(data.thread_peers[i]);
if (old_stack_info.frame_count > 0) {
// Only copy when there's data - leave the nullptr alone.
size_t frames_size = static_cast<size_t>(old_stack_info.frame_count) * sizeof(jvmtiFrameInfo);
memcpy(frame_info, old_stack_info.frame_buffer, frames_size);
new_stack_info.frame_buffer = frame_info;
frame_info += old_stack_info.frame_count;
}
}
*stack_info_ptr = stack_info;
*thread_count_ptr = static_cast<jint>(data.frames.size());
return ERR(NONE);
}
jvmtiError StackUtil::GetThreadListStackTraces(jvmtiEnv* env,
jint thread_count,
const jthread* thread_list,
jint max_frame_count,
jvmtiStackInfo** stack_info_ptr) {
if (max_frame_count < 0) {
return ERR(ILLEGAL_ARGUMENT);
}
if (thread_count < 0) {
return ERR(ILLEGAL_ARGUMENT);
}
if (thread_count == 0) {
*stack_info_ptr = nullptr;
return ERR(NONE);
}
if (stack_info_ptr == nullptr || stack_info_ptr == nullptr) {
return ERR(NULL_POINTER);
}
art::Thread* current = art::Thread::Current();
art::ScopedObjectAccess soa(current); // Now we know we have the shared lock.
struct SelectStackTracesData {
SelectStackTracesData() : mutex("GetSelectStackTraces", art::LockLevel::kAbortLock) {}
std::vector<jvmtiFrameInfo>* GetFrameStorageFor(art::Thread* self, art::Thread* thread)
REQUIRES_SHARED(art::Locks::mutator_lock_)
REQUIRES(!mutex) {
art::ObjPtr<art::mirror::Object> peer = thread->GetPeerFromOtherThread();
for (size_t index = 0; index != handles.size(); ++index) {
if (peer == handles[index].Get()) {
// Found the thread.
art::MutexLock mu(self, mutex);
threads.push_back(thread);
thread_list_indices.push_back(index);
frames.emplace_back(new std::vector<jvmtiFrameInfo>());
return frames.back().get();
}
}
return nullptr;
}
art::Mutex mutex;
// Selection data.
std::vector<art::Handle<art::mirror::Object>> handles;
// Storage. Only access directly after completion.
std::vector<art::Thread*> threads;
std::vector<size_t> thread_list_indices;
std::vector<std::unique_ptr<std::vector<jvmtiFrameInfo>>> frames;
};
SelectStackTracesData data;
// Decode all threads to raw pointers. Put them into a handle scope to avoid any moving GC bugs.
art::VariableSizedHandleScope hs(current);
for (jint i = 0; i != thread_count; ++i) {
if (thread_list[i] == nullptr) {
return ERR(INVALID_THREAD);
}
if (!soa.Env()->IsInstanceOf(thread_list[i], art::WellKnownClasses::java_lang_Thread)) {
return ERR(INVALID_THREAD);
}
data.handles.push_back(hs.NewHandle(soa.Decode<art::mirror::Object>(thread_list[i])));
}
RunCheckpointAndWait(&data, static_cast<size_t>(max_frame_count));
// Convert the data into our output format.
// Note: we use an array of jvmtiStackInfo for convenience. The spec says we need to
// allocate one big chunk for this and the actual frames, which means we need
// to either be conservative or rearrange things later (the latter is implemented).
std::unique_ptr<jvmtiStackInfo[]> stack_info_array(new jvmtiStackInfo[data.frames.size()]);
std::vector<std::unique_ptr<jvmtiFrameInfo[]>> frame_infos;
frame_infos.reserve(data.frames.size());
// Now run through and add data for each thread.
size_t sum_frames = 0;
for (size_t index = 0; index < data.frames.size(); ++index) {
jvmtiStackInfo& stack_info = stack_info_array.get()[index];
memset(&stack_info, 0, sizeof(jvmtiStackInfo));
art::Thread* self = data.threads[index];
const std::vector<jvmtiFrameInfo>& thread_frames = *data.frames[index].get();
// For the time being, set the thread to null. We don't have good ScopedLocalRef
// infrastructure.
DCHECK(self->GetPeerFromOtherThread() != nullptr);
stack_info.thread = nullptr;
stack_info.state = JVMTI_THREAD_STATE_SUSPENDED;
size_t collected_frames = thread_frames.size();
if (max_frame_count == 0 || collected_frames == 0) {
stack_info.frame_count = 0;
stack_info.frame_buffer = nullptr;
continue;
}
DCHECK_LE(collected_frames, static_cast<size_t>(max_frame_count));
jvmtiFrameInfo* frame_info = new jvmtiFrameInfo[collected_frames];
frame_infos.emplace_back(frame_info);
jint count;
jvmtiError translate_result = TranslateFrameVector(thread_frames,
0,
0,
static_cast<jint>(collected_frames),
frame_info,
&count);
DCHECK(translate_result == JVMTI_ERROR_NONE);
stack_info.frame_count = static_cast<jint>(collected_frames);
stack_info.frame_buffer = frame_info;
sum_frames += static_cast<size_t>(count);
}
// No errors, yet. Now put it all into an output buffer. Note that this is not frames.size(),
// potentially.
size_t rounded_stack_info_size = art::RoundUp(sizeof(jvmtiStackInfo) * thread_count,
alignof(jvmtiFrameInfo));
size_t chunk_size = rounded_stack_info_size + sum_frames * sizeof(jvmtiFrameInfo);
unsigned char* chunk_data;
jvmtiError alloc_result = env->Allocate(chunk_size, &chunk_data);
if (alloc_result != ERR(NONE)) {
return alloc_result;
}
jvmtiStackInfo* stack_info = reinterpret_cast<jvmtiStackInfo*>(chunk_data);
jvmtiFrameInfo* frame_info = reinterpret_cast<jvmtiFrameInfo*>(
chunk_data + rounded_stack_info_size);
for (size_t i = 0; i < static_cast<size_t>(thread_count); ++i) {
// Check whether we found a running thread for this.
// Note: For simplicity, and with the expectation that the list is usually small, use a simple
// search. (The list is *not* sorted!)
auto it = std::find(data.thread_list_indices.begin(), data.thread_list_indices.end(), i);
if (it == data.thread_list_indices.end()) {
// No native thread. Must be new or dead. We need to fill out the stack info now.
// (Need to read the Java "started" field to know whether this is starting or terminated.)
art::ObjPtr<art::mirror::Object> peer = soa.Decode<art::mirror::Object>(thread_list[i]);
art::ObjPtr<art::mirror::Class> klass = peer->GetClass();
art::ArtField* started_field = klass->FindDeclaredInstanceField("started", "Z");
CHECK(started_field != nullptr);
bool started = started_field->GetBoolean(peer) != 0;
constexpr jint kStartedState = JVMTI_JAVA_LANG_THREAD_STATE_NEW;
constexpr jint kTerminatedState = JVMTI_THREAD_STATE_TERMINATED |
JVMTI_JAVA_LANG_THREAD_STATE_TERMINATED;
stack_info[i].thread = reinterpret_cast<JNIEnv*>(soa.Env())->NewLocalRef(thread_list[i]);
stack_info[i].state = started ? kTerminatedState : kStartedState;
stack_info[i].frame_count = 0;
stack_info[i].frame_buffer = nullptr;
} else {
// Had a native thread and frames.
size_t f_index = it - data.thread_list_indices.begin();
jvmtiStackInfo& old_stack_info = stack_info_array.get()[f_index];
jvmtiStackInfo& new_stack_info = stack_info[i];
memcpy(&new_stack_info, &old_stack_info, sizeof(jvmtiStackInfo));
new_stack_info.thread = reinterpret_cast<JNIEnv*>(soa.Env())->NewLocalRef(thread_list[i]);
if (old_stack_info.frame_count > 0) {
// Only copy when there's data - leave the nullptr alone.
size_t frames_size =
static_cast<size_t>(old_stack_info.frame_count) * sizeof(jvmtiFrameInfo);
memcpy(frame_info, old_stack_info.frame_buffer, frames_size);
new_stack_info.frame_buffer = frame_info;
frame_info += old_stack_info.frame_count;
}
}
}
*stack_info_ptr = stack_info;
return ERR(NONE);
}
// Walks up the stack counting Java frames. This is not StackVisitor::ComputeNumFrames, as
// runtime methods and transitions must not be counted.
struct GetFrameCountVisitor : public art::StackVisitor {
explicit GetFrameCountVisitor(art::Thread* thread)
: art::StackVisitor(thread, nullptr, art::StackVisitor::StackWalkKind::kIncludeInlinedFrames),
count(0) {}
bool VisitFrame() REQUIRES_SHARED(art::Locks::mutator_lock_) {
art::ArtMethod* m = GetMethod();
const bool do_count = !(m == nullptr || m->IsRuntimeMethod());
if (do_count) {
count++;
}
return true;
}
size_t count;
};
struct GetFrameCountClosure : public art::Closure {
public:
GetFrameCountClosure() : count(0) {}
void Run(art::Thread* self) OVERRIDE REQUIRES_SHARED(art::Locks::mutator_lock_) {
GetFrameCountVisitor visitor(self);
visitor.WalkStack(false);
count = visitor.count;
}
size_t count;
};
jvmtiError StackUtil::GetFrameCount(jvmtiEnv* env ATTRIBUTE_UNUSED,
jthread java_thread,
jint* count_ptr) {
// It is not great that we have to hold these locks for so long, but it is necessary to ensure
// that the thread isn't dying on us.
art::ScopedObjectAccess soa(art::Thread::Current());
art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
art::Thread* thread;
jvmtiError thread_error = GetThread(art::Thread::Current()->GetJniEnv(),
soa,
java_thread,
&thread);
if (thread_error != ERR(NONE)) {
return thread_error;
}
DCHECK(thread != nullptr);
if (count_ptr == nullptr) {
return ERR(NULL_POINTER);
}
GetFrameCountClosure closure;
thread->RequestSynchronousCheckpoint(&closure);
*count_ptr = closure.count;
return ERR(NONE);
}
// Walks up the stack 'n' callers, when used with Thread::WalkStack.
struct GetLocationVisitor : public art::StackVisitor {
GetLocationVisitor(art::Thread* thread, size_t n_in)
: art::StackVisitor(thread, nullptr, art::StackVisitor::StackWalkKind::kIncludeInlinedFrames),
n(n_in),
count(0),
caller(nullptr),
caller_dex_pc(0) {}
bool VisitFrame() REQUIRES_SHARED(art::Locks::mutator_lock_) {
art::ArtMethod* m = GetMethod();
const bool do_count = !(m == nullptr || m->IsRuntimeMethod());
if (do_count) {
DCHECK(caller == nullptr);
if (count == n) {
caller = m;
caller_dex_pc = GetDexPc(false);
return false;
}
count++;
}
return true;
}
const size_t n;
size_t count;
art::ArtMethod* caller;
uint32_t caller_dex_pc;
};
struct GetLocationClosure : public art::Closure {
public:
explicit GetLocationClosure(size_t n_in) : n(n_in), method(nullptr), dex_pc(0) {}
void Run(art::Thread* self) OVERRIDE REQUIRES_SHARED(art::Locks::mutator_lock_) {
GetLocationVisitor visitor(self, n);
visitor.WalkStack(false);
method = visitor.caller;
dex_pc = visitor.caller_dex_pc;
}
const size_t n;
art::ArtMethod* method;
uint32_t dex_pc;
};
jvmtiError StackUtil::GetFrameLocation(jvmtiEnv* env ATTRIBUTE_UNUSED,
jthread java_thread,
jint depth,
jmethodID* method_ptr,
jlocation* location_ptr) {
// It is not great that we have to hold these locks for so long, but it is necessary to ensure
// that the thread isn't dying on us.
art::ScopedObjectAccess soa(art::Thread::Current());
art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
art::Thread* thread;
jvmtiError thread_error = GetThread(art::Thread::Current()->GetJniEnv(),
soa,
java_thread,
&thread);
if (thread_error != ERR(NONE)) {
return thread_error;
}
DCHECK(thread != nullptr);
if (depth < 0) {
return ERR(ILLEGAL_ARGUMENT);
}
if (method_ptr == nullptr || location_ptr == nullptr) {
return ERR(NULL_POINTER);
}
GetLocationClosure closure(static_cast<size_t>(depth));
thread->RequestSynchronousCheckpoint(&closure);
if (closure.method == nullptr) {
return ERR(NO_MORE_FRAMES);
}
*method_ptr = art::jni::EncodeArtMethod(closure.method);
if (closure.method->IsNative()) {
*location_ptr = -1;
} else {
if (closure.dex_pc == art::DexFile::kDexNoIndex) {
return ERR(INTERNAL);
}
*location_ptr = static_cast<jlocation>(closure.dex_pc);
}
return ERR(NONE);
}
} // namespace openjdkjvmti
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