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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "debugger.h"
#include <sys/uio.h>
#include <set>
#include "arch/context.h"
#include "class_linker.h"
#include "class_linker-inl.h"
#include "dex_file-inl.h"
#include "dex_instruction.h"
#include "gc/accounting/card_table-inl.h"
#include "gc/space/large_object_space.h"
#include "gc/space/space-inl.h"
#include "handle_scope.h"
#include "jdwp/object_registry.h"
#include "mirror/art_field-inl.h"
#include "mirror/art_method-inl.h"
#include "mirror/class.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-inl.h"
#include "mirror/string-inl.h"
#include "mirror/throwable.h"
#include "object_utils.h"
#include "quick/inline_method_analyser.h"
#include "reflection.h"
#include "safe_map.h"
#include "scoped_thread_state_change.h"
#include "ScopedLocalRef.h"
#include "ScopedPrimitiveArray.h"
#include "handle_scope-inl.h"
#include "thread_list.h"
#include "throw_location.h"
#include "utf.h"
#include "verifier/method_verifier-inl.h"
#include "well_known_classes.h"
#ifdef HAVE_ANDROID_OS
#include "cutils/properties.h"
#endif
namespace art {
static const size_t kMaxAllocRecordStackDepth = 16; // Max 255.
static const size_t kDefaultNumAllocRecords = 64*1024; // Must be a power of 2.
struct AllocRecordStackTraceElement {
mirror::ArtMethod* method;
uint32_t dex_pc;
AllocRecordStackTraceElement() : method(nullptr), dex_pc(0) {
}
int32_t LineNumber() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
return MethodHelper(method).GetLineNumFromDexPC(dex_pc);
}
};
struct AllocRecord {
mirror::Class* type;
size_t byte_count;
uint16_t thin_lock_id;
AllocRecordStackTraceElement stack[kMaxAllocRecordStackDepth]; // Unused entries have NULL method.
size_t GetDepth() {
size_t depth = 0;
while (depth < kMaxAllocRecordStackDepth && stack[depth].method != NULL) {
++depth;
}
return depth;
}
void UpdateObjectPointers(IsMarkedCallback* callback, void* arg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (type != nullptr) {
type = down_cast<mirror::Class*>(callback(type, arg));
}
for (size_t stack_frame = 0; stack_frame < kMaxAllocRecordStackDepth; ++stack_frame) {
mirror::ArtMethod*& m = stack[stack_frame].method;
if (m == nullptr) {
break;
}
m = down_cast<mirror::ArtMethod*>(callback(m, arg));
}
}
};
struct Breakpoint {
// The location of this breakpoint.
mirror::ArtMethod* method;
uint32_t dex_pc;
// Indicates whether breakpoint needs full deoptimization or selective deoptimization.
bool need_full_deoptimization;
Breakpoint(mirror::ArtMethod* method, uint32_t dex_pc, bool need_full_deoptimization)
: method(method), dex_pc(dex_pc), need_full_deoptimization(need_full_deoptimization) {}
void VisitRoots(RootCallback* callback, void* arg) {
if (method != nullptr) {
callback(reinterpret_cast<mirror::Object**>(&method), arg, 0, kRootDebugger);
}
}
};
static std::ostream& operator<<(std::ostream& os, const Breakpoint& rhs)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
os << StringPrintf("Breakpoint[%s @%#x]", PrettyMethod(rhs.method).c_str(), rhs.dex_pc);
return os;
}
class DebugInstrumentationListener FINAL : public instrumentation::InstrumentationListener {
public:
DebugInstrumentationListener() {}
virtual ~DebugInstrumentationListener() {}
void MethodEntered(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method,
uint32_t dex_pc)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (method->IsNative()) {
// TODO: post location events is a suspension point and native method entry stubs aren't.
return;
}
Dbg::UpdateDebugger(thread, this_object, method, 0, Dbg::kMethodEntry, nullptr);
}
void MethodExited(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method,
uint32_t dex_pc, const JValue& return_value)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (method->IsNative()) {
// TODO: post location events is a suspension point and native method entry stubs aren't.
return;
}
Dbg::UpdateDebugger(thread, this_object, method, dex_pc, Dbg::kMethodExit, &return_value);
}
void MethodUnwind(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method,
uint32_t dex_pc)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// We're not recorded to listen to this kind of event, so complain.
LOG(ERROR) << "Unexpected method unwind event in debugger " << PrettyMethod(method)
<< " " << dex_pc;
}
void DexPcMoved(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method,
uint32_t new_dex_pc)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Dbg::UpdateDebugger(thread, this_object, method, new_dex_pc, 0, nullptr);
}
void FieldRead(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method,
uint32_t dex_pc, mirror::ArtField* field)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Dbg::PostFieldAccessEvent(method, dex_pc, this_object, field);
}
void FieldWritten(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method,
uint32_t dex_pc, mirror::ArtField* field, const JValue& field_value)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Dbg::PostFieldModificationEvent(method, dex_pc, this_object, field, &field_value);
}
void ExceptionCaught(Thread* thread, const ThrowLocation& throw_location,
mirror::ArtMethod* catch_method, uint32_t catch_dex_pc,
mirror::Throwable* exception_object)
OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Dbg::PostException(throw_location, catch_method, catch_dex_pc, exception_object);
}
private:
DISALLOW_COPY_AND_ASSIGN(DebugInstrumentationListener);
} gDebugInstrumentationListener;
// JDWP is allowed unless the Zygote forbids it.
static bool gJdwpAllowed = true;
// Was there a -Xrunjdwp or -agentlib:jdwp= argument on the command line?
static bool gJdwpConfigured = false;
// Broken-down JDWP options. (Only valid if IsJdwpConfigured() is true.)
static JDWP::JdwpOptions gJdwpOptions;
// Runtime JDWP state.
static JDWP::JdwpState* gJdwpState = NULL;
static bool gDebuggerConnected; // debugger or DDMS is connected.
static bool gDebuggerActive; // debugger is making requests.
static bool gDisposed; // debugger called VirtualMachine.Dispose, so we should drop the connection.
static bool gDdmThreadNotification = false;
// DDMS GC-related settings.
static Dbg::HpifWhen gDdmHpifWhen = Dbg::HPIF_WHEN_NEVER;
static Dbg::HpsgWhen gDdmHpsgWhen = Dbg::HPSG_WHEN_NEVER;
static Dbg::HpsgWhat gDdmHpsgWhat;
static Dbg::HpsgWhen gDdmNhsgWhen = Dbg::HPSG_WHEN_NEVER;
static Dbg::HpsgWhat gDdmNhsgWhat;
static ObjectRegistry* gRegistry = nullptr;
// Recent allocation tracking.
Mutex* Dbg::alloc_tracker_lock_ = nullptr;
AllocRecord* Dbg::recent_allocation_records_ = nullptr; // TODO: CircularBuffer<AllocRecord>
size_t Dbg::alloc_record_max_ = 0;
size_t Dbg::alloc_record_head_ = 0;
size_t Dbg::alloc_record_count_ = 0;
// Deoptimization support.
Mutex* Dbg::deoptimization_lock_ = nullptr;
std::vector<DeoptimizationRequest> Dbg::deoptimization_requests_;
size_t Dbg::full_deoptimization_event_count_ = 0;
size_t Dbg::delayed_full_undeoptimization_count_ = 0;
// Instrumentation event reference counters.
size_t Dbg::dex_pc_change_event_ref_count_ = 0;
size_t Dbg::method_enter_event_ref_count_ = 0;
size_t Dbg::method_exit_event_ref_count_ = 0;
size_t Dbg::field_read_event_ref_count_ = 0;
size_t Dbg::field_write_event_ref_count_ = 0;
size_t Dbg::exception_catch_event_ref_count_ = 0;
uint32_t Dbg::instrumentation_events_ = 0;
// Breakpoints.
static std::vector<Breakpoint> gBreakpoints GUARDED_BY(Locks::breakpoint_lock_);
void DebugInvokeReq::VisitRoots(RootCallback* callback, void* arg, uint32_t tid,
RootType root_type) {
if (receiver != nullptr) {
callback(&receiver, arg, tid, root_type);
}
if (thread != nullptr) {
callback(&thread, arg, tid, root_type);
}
if (klass != nullptr) {
callback(reinterpret_cast<mirror::Object**>(&klass), arg, tid, root_type);
}
if (method != nullptr) {
callback(reinterpret_cast<mirror::Object**>(&method), arg, tid, root_type);
}
}
void DebugInvokeReq::Clear() {
invoke_needed = false;
receiver = nullptr;
thread = nullptr;
klass = nullptr;
method = nullptr;
}
void SingleStepControl::VisitRoots(RootCallback* callback, void* arg, uint32_t tid,
RootType root_type) {
if (method != nullptr) {
callback(reinterpret_cast<mirror::Object**>(&method), arg, tid, root_type);
}
}
bool SingleStepControl::ContainsDexPc(uint32_t dex_pc) const {
return dex_pcs.find(dex_pc) == dex_pcs.end();
}
void SingleStepControl::Clear() {
is_active = false;
method = nullptr;
dex_pcs.clear();
}
void DeoptimizationRequest::VisitRoots(RootCallback* callback, void* arg) {
if (method != nullptr) {
callback(reinterpret_cast<mirror::Object**>(&method), arg, 0, kRootDebugger);
}
}
static bool IsBreakpoint(const mirror::ArtMethod* m, uint32_t dex_pc)
LOCKS_EXCLUDED(Locks::breakpoint_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
MutexLock mu(Thread::Current(), *Locks::breakpoint_lock_);
for (size_t i = 0, e = gBreakpoints.size(); i < e; ++i) {
if (gBreakpoints[i].method == m && gBreakpoints[i].dex_pc == dex_pc) {
VLOG(jdwp) << "Hit breakpoint #" << i << ": " << gBreakpoints[i];
return true;
}
}
return false;
}
static bool IsSuspendedForDebugger(ScopedObjectAccessUnchecked& soa, Thread* thread)
LOCKS_EXCLUDED(Locks::thread_suspend_count_lock_) {
MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_);
// A thread may be suspended for GC; in this code, we really want to know whether
// there's a debugger suspension active.
return thread->IsSuspended() && thread->GetDebugSuspendCount() > 0;
}
static mirror::Array* DecodeArray(JDWP::RefTypeId id, JDWP::JdwpError& status)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
status = JDWP::ERR_INVALID_OBJECT;
return NULL;
}
if (!o->IsArrayInstance()) {
status = JDWP::ERR_INVALID_ARRAY;
return NULL;
}
status = JDWP::ERR_NONE;
return o->AsArray();
}
static mirror::Class* DecodeClass(JDWP::RefTypeId id, JDWP::JdwpError& status)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
status = JDWP::ERR_INVALID_OBJECT;
return NULL;
}
if (!o->IsClass()) {
status = JDWP::ERR_INVALID_CLASS;
return NULL;
}
status = JDWP::ERR_NONE;
return o->AsClass();
}
static JDWP::JdwpError DecodeThread(ScopedObjectAccessUnchecked& soa, JDWP::ObjectId thread_id, Thread*& thread)
EXCLUSIVE_LOCKS_REQUIRED(Locks::thread_list_lock_)
LOCKS_EXCLUDED(Locks::thread_suspend_count_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* thread_peer = gRegistry->Get<mirror::Object*>(thread_id);
if (thread_peer == NULL || thread_peer == ObjectRegistry::kInvalidObject) {
// This isn't even an object.
return JDWP::ERR_INVALID_OBJECT;
}
mirror::Class* java_lang_Thread = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread);
if (!java_lang_Thread->IsAssignableFrom(thread_peer->GetClass())) {
// This isn't a thread.
return JDWP::ERR_INVALID_THREAD;
}
thread = Thread::FromManagedThread(soa, thread_peer);
if (thread == NULL) {
// This is a java.lang.Thread without a Thread*. Must be a zombie.
return JDWP::ERR_THREAD_NOT_ALIVE;
}
return JDWP::ERR_NONE;
}
static JDWP::JdwpTag BasicTagFromDescriptor(const char* descriptor) {
// JDWP deliberately uses the descriptor characters' ASCII values for its enum.
// Note that by "basic" we mean that we don't get more specific than JT_OBJECT.
return static_cast<JDWP::JdwpTag>(descriptor[0]);
}
static JDWP::JdwpTag TagFromClass(const ScopedObjectAccessUnchecked& soa, mirror::Class* c)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
CHECK(c != NULL);
if (c->IsArrayClass()) {
return JDWP::JT_ARRAY;
}
if (c->IsStringClass()) {
return JDWP::JT_STRING;
}
if (c->IsClassClass()) {
return JDWP::JT_CLASS_OBJECT;
}
{
mirror::Class* thread_class = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread);
if (thread_class->IsAssignableFrom(c)) {
return JDWP::JT_THREAD;
}
}
{
mirror::Class* thread_group_class =
soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup);
if (thread_group_class->IsAssignableFrom(c)) {
return JDWP::JT_THREAD_GROUP;
}
}
{
mirror::Class* class_loader_class =
soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ClassLoader);
if (class_loader_class->IsAssignableFrom(c)) {
return JDWP::JT_CLASS_LOADER;
}
}
return JDWP::JT_OBJECT;
}
/*
* Objects declared to hold Object might actually hold a more specific
* type. The debugger may take a special interest in these (e.g. it
* wants to display the contents of Strings), so we want to return an
* appropriate tag.
*
* Null objects are tagged JT_OBJECT.
*/
static JDWP::JdwpTag TagFromObject(const ScopedObjectAccessUnchecked& soa, mirror::Object* o)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
return (o == NULL) ? JDWP::JT_OBJECT : TagFromClass(soa, o->GetClass());
}
static bool IsPrimitiveTag(JDWP::JdwpTag tag) {
switch (tag) {
case JDWP::JT_BOOLEAN:
case JDWP::JT_BYTE:
case JDWP::JT_CHAR:
case JDWP::JT_FLOAT:
case JDWP::JT_DOUBLE:
case JDWP::JT_INT:
case JDWP::JT_LONG:
case JDWP::JT_SHORT:
case JDWP::JT_VOID:
return true;
default:
return false;
}
}
/*
* Handle one of the JDWP name/value pairs.
*
* JDWP options are:
* help: if specified, show help message and bail
* transport: may be dt_socket or dt_shmem
* address: for dt_socket, "host:port", or just "port" when listening
* server: if "y", wait for debugger to attach; if "n", attach to debugger
* timeout: how long to wait for debugger to connect / listen
*
* Useful with server=n (these aren't supported yet):
* onthrow=<exception-name>: connect to debugger when exception thrown
* onuncaught=y|n: connect to debugger when uncaught exception thrown
* launch=<command-line>: launch the debugger itself
*
* The "transport" option is required, as is "address" if server=n.
*/
static bool ParseJdwpOption(const std::string& name, const std::string& value) {
if (name == "transport") {
if (value == "dt_socket") {
gJdwpOptions.transport = JDWP::kJdwpTransportSocket;
} else if (value == "dt_android_adb") {
gJdwpOptions.transport = JDWP::kJdwpTransportAndroidAdb;
} else {
LOG(ERROR) << "JDWP transport not supported: " << value;
return false;
}
} else if (name == "server") {
if (value == "n") {
gJdwpOptions.server = false;
} else if (value == "y") {
gJdwpOptions.server = true;
} else {
LOG(ERROR) << "JDWP option 'server' must be 'y' or 'n'";
return false;
}
} else if (name == "suspend") {
if (value == "n") {
gJdwpOptions.suspend = false;
} else if (value == "y") {
gJdwpOptions.suspend = true;
} else {
LOG(ERROR) << "JDWP option 'suspend' must be 'y' or 'n'";
return false;
}
} else if (name == "address") {
/* this is either <port> or <host>:<port> */
std::string port_string;
gJdwpOptions.host.clear();
std::string::size_type colon = value.find(':');
if (colon != std::string::npos) {
gJdwpOptions.host = value.substr(0, colon);
port_string = value.substr(colon + 1);
} else {
port_string = value;
}
if (port_string.empty()) {
LOG(ERROR) << "JDWP address missing port: " << value;
return false;
}
char* end;
uint64_t port = strtoul(port_string.c_str(), &end, 10);
if (*end != '\0' || port > 0xffff) {
LOG(ERROR) << "JDWP address has junk in port field: " << value;
return false;
}
gJdwpOptions.port = port;
} else if (name == "launch" || name == "onthrow" || name == "oncaught" || name == "timeout") {
/* valid but unsupported */
LOG(INFO) << "Ignoring JDWP option '" << name << "'='" << value << "'";
} else {
LOG(INFO) << "Ignoring unrecognized JDWP option '" << name << "'='" << value << "'";
}
return true;
}
/*
* Parse the latter half of a -Xrunjdwp/-agentlib:jdwp= string, e.g.:
* "transport=dt_socket,address=8000,server=y,suspend=n"
*/
bool Dbg::ParseJdwpOptions(const std::string& options) {
VLOG(jdwp) << "ParseJdwpOptions: " << options;
std::vector<std::string> pairs;
Split(options, ',', pairs);
for (size_t i = 0; i < pairs.size(); ++i) {
std::string::size_type equals = pairs[i].find('=');
if (equals == std::string::npos) {
LOG(ERROR) << "Can't parse JDWP option '" << pairs[i] << "' in '" << options << "'";
return false;
}
ParseJdwpOption(pairs[i].substr(0, equals), pairs[i].substr(equals + 1));
}
if (gJdwpOptions.transport == JDWP::kJdwpTransportUnknown) {
LOG(ERROR) << "Must specify JDWP transport: " << options;
}
if (!gJdwpOptions.server && (gJdwpOptions.host.empty() || gJdwpOptions.port == 0)) {
LOG(ERROR) << "Must specify JDWP host and port when server=n: " << options;
return false;
}
gJdwpConfigured = true;
return true;
}
void Dbg::StartJdwp() {
if (!gJdwpAllowed || !IsJdwpConfigured()) {
// No JDWP for you!
return;
}
CHECK(gRegistry == nullptr);
gRegistry = new ObjectRegistry;
alloc_tracker_lock_ = new Mutex("AllocTracker lock");
deoptimization_lock_ = new Mutex("deoptimization lock", kDeoptimizationLock);
// Init JDWP if the debugger is enabled. This may connect out to a
// debugger, passively listen for a debugger, or block waiting for a
// debugger.
gJdwpState = JDWP::JdwpState::Create(&gJdwpOptions);
if (gJdwpState == NULL) {
// We probably failed because some other process has the port already, which means that
// if we don't abort the user is likely to think they're talking to us when they're actually
// talking to that other process.
LOG(FATAL) << "Debugger thread failed to initialize";
}
// If a debugger has already attached, send the "welcome" message.
// This may cause us to suspend all threads.
if (gJdwpState->IsActive()) {
ScopedObjectAccess soa(Thread::Current());
if (!gJdwpState->PostVMStart()) {
LOG(WARNING) << "Failed to post 'start' message to debugger";
}
}
}
void Dbg::VisitRoots(RootCallback* callback, void* arg) {
{
MutexLock mu(Thread::Current(), *Locks::breakpoint_lock_);
for (Breakpoint& bp : gBreakpoints) {
bp.VisitRoots(callback, arg);
}
}
if (deoptimization_lock_ != nullptr) { // only true if the debugger is started.
MutexLock mu(Thread::Current(), *deoptimization_lock_);
for (DeoptimizationRequest& req : deoptimization_requests_) {
req.VisitRoots(callback, arg);
}
}
}
void Dbg::StopJdwp() {
// Prevent the JDWP thread from processing JDWP incoming packets after we close the connection.
Disposed();
delete gJdwpState;
gJdwpState = nullptr;
delete gRegistry;
gRegistry = nullptr;
delete alloc_tracker_lock_;
alloc_tracker_lock_ = nullptr;
delete deoptimization_lock_;
deoptimization_lock_ = nullptr;
}
void Dbg::GcDidFinish() {
if (gDdmHpifWhen != HPIF_WHEN_NEVER) {
ScopedObjectAccess soa(Thread::Current());
VLOG(jdwp) << "Sending heap info to DDM";
DdmSendHeapInfo(gDdmHpifWhen);
}
if (gDdmHpsgWhen != HPSG_WHEN_NEVER) {
ScopedObjectAccess soa(Thread::Current());
VLOG(jdwp) << "Dumping heap to DDM";
DdmSendHeapSegments(false);
}
if (gDdmNhsgWhen != HPSG_WHEN_NEVER) {
ScopedObjectAccess soa(Thread::Current());
VLOG(jdwp) << "Dumping native heap to DDM";
DdmSendHeapSegments(true);
}
}
void Dbg::SetJdwpAllowed(bool allowed) {
gJdwpAllowed = allowed;
}
DebugInvokeReq* Dbg::GetInvokeReq() {
return Thread::Current()->GetInvokeReq();
}
Thread* Dbg::GetDebugThread() {
return (gJdwpState != NULL) ? gJdwpState->GetDebugThread() : NULL;
}
void Dbg::ClearWaitForEventThread() {
gJdwpState->ClearWaitForEventThread();
}
void Dbg::Connected() {
CHECK(!gDebuggerConnected);
VLOG(jdwp) << "JDWP has attached";
gDebuggerConnected = true;
gDisposed = false;
}
void Dbg::Disposed() {
gDisposed = true;
}
bool Dbg::IsDisposed() {
return gDisposed;
}
void Dbg::GoActive() {
// Enable all debugging features, including scans for breakpoints.
// This is a no-op if we're already active.
// Only called from the JDWP handler thread.
if (gDebuggerActive) {
return;
}
{
// TODO: dalvik only warned if there were breakpoints left over. clear in Dbg::Disconnected?
MutexLock mu(Thread::Current(), *Locks::breakpoint_lock_);
CHECK_EQ(gBreakpoints.size(), 0U);
}
{
MutexLock mu(Thread::Current(), *deoptimization_lock_);
CHECK_EQ(deoptimization_requests_.size(), 0U);
CHECK_EQ(full_deoptimization_event_count_, 0U);
CHECK_EQ(delayed_full_undeoptimization_count_, 0U);
CHECK_EQ(dex_pc_change_event_ref_count_, 0U);
CHECK_EQ(method_enter_event_ref_count_, 0U);
CHECK_EQ(method_exit_event_ref_count_, 0U);
CHECK_EQ(field_read_event_ref_count_, 0U);
CHECK_EQ(field_write_event_ref_count_, 0U);
CHECK_EQ(exception_catch_event_ref_count_, 0U);
}
Runtime* runtime = Runtime::Current();
runtime->GetThreadList()->SuspendAll();
Thread* self = Thread::Current();
ThreadState old_state = self->SetStateUnsafe(kRunnable);
CHECK_NE(old_state, kRunnable);
runtime->GetInstrumentation()->EnableDeoptimization();
instrumentation_events_ = 0;
gDebuggerActive = true;
CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable);
runtime->GetThreadList()->ResumeAll();
LOG(INFO) << "Debugger is active";
}
void Dbg::Disconnected() {
CHECK(gDebuggerConnected);
LOG(INFO) << "Debugger is no longer active";
// Suspend all threads and exclusively acquire the mutator lock. Set the state of the thread
// to kRunnable to avoid scoped object access transitions. Remove the debugger as a listener
// and clear the object registry.
Runtime* runtime = Runtime::Current();
runtime->GetThreadList()->SuspendAll();
Thread* self = Thread::Current();
ThreadState old_state = self->SetStateUnsafe(kRunnable);
// Debugger may not be active at this point.
if (gDebuggerActive) {
{
// Since we're going to disable deoptimization, we clear the deoptimization requests queue.
// This prevents us from having any pending deoptimization request when the debugger attaches
// to us again while no event has been requested yet.
MutexLock mu(Thread::Current(), *deoptimization_lock_);
deoptimization_requests_.clear();
full_deoptimization_event_count_ = 0U;
delayed_full_undeoptimization_count_ = 0U;
}
if (instrumentation_events_ != 0) {
runtime->GetInstrumentation()->RemoveListener(&gDebugInstrumentationListener,
instrumentation_events_);
instrumentation_events_ = 0;
}
runtime->GetInstrumentation()->DisableDeoptimization();
gDebuggerActive = false;
}
gRegistry->Clear();
gDebuggerConnected = false;
CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable);
runtime->GetThreadList()->ResumeAll();
}
bool Dbg::IsDebuggerActive() {
return gDebuggerActive;
}
bool Dbg::IsJdwpConfigured() {
return gJdwpConfigured;
}
int64_t Dbg::LastDebuggerActivity() {
return gJdwpState->LastDebuggerActivity();
}
void Dbg::UndoDebuggerSuspensions() {
Runtime::Current()->GetThreadList()->UndoDebuggerSuspensions();
}
std::string Dbg::GetClassName(JDWP::RefTypeId class_id) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(class_id);
if (o == NULL) {
return "NULL";
}
if (o == ObjectRegistry::kInvalidObject) {
return StringPrintf("invalid object %p", reinterpret_cast<void*>(class_id));
}
if (!o->IsClass()) {
return StringPrintf("non-class %p", o); // This is only used for debugging output anyway.
}
return DescriptorToName(o->AsClass()->GetDescriptor().c_str());
}
JDWP::JdwpError Dbg::GetClassObject(JDWP::RefTypeId id, JDWP::ObjectId& class_object_id) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(id, status);
if (c == NULL) {
return status;
}
class_object_id = gRegistry->Add(c);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetSuperclass(JDWP::RefTypeId id, JDWP::RefTypeId& superclass_id) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(id, status);
if (c == NULL) {
return status;
}
if (c->IsInterface()) {
// http://code.google.com/p/android/issues/detail?id=20856
superclass_id = 0;
} else {
superclass_id = gRegistry->Add(c->GetSuperClass());
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetClassLoader(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
expandBufAddObjectId(pReply, gRegistry->Add(o->GetClass()->GetClassLoader()));
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetModifiers(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(id, status);
if (c == NULL) {
return status;
}
uint32_t access_flags = c->GetAccessFlags() & kAccJavaFlagsMask;
// Set ACC_SUPER. Dex files don't contain this flag but only classes are supposed to have it set,
// not interfaces.
// Class.getModifiers doesn't return it, but JDWP does, so we set it here.
if ((access_flags & kAccInterface) == 0) {
access_flags |= kAccSuper;
}
expandBufAdd4BE(pReply, access_flags);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetMonitorInfo(JDWP::ObjectId object_id, JDWP::ExpandBuf* reply)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
// Ensure all threads are suspended while we read objects' lock words.
Thread* self = Thread::Current();
CHECK_EQ(self->GetState(), kRunnable);
self->TransitionFromRunnableToSuspended(kSuspended);
Runtime::Current()->GetThreadList()->SuspendAll();
MonitorInfo monitor_info(o);
Runtime::Current()->GetThreadList()->ResumeAll();
self->TransitionFromSuspendedToRunnable();
if (monitor_info.owner_ != NULL) {
expandBufAddObjectId(reply, gRegistry->Add(monitor_info.owner_->GetPeer()));
} else {
expandBufAddObjectId(reply, gRegistry->Add(NULL));
}
expandBufAdd4BE(reply, monitor_info.entry_count_);
expandBufAdd4BE(reply, monitor_info.waiters_.size());
for (size_t i = 0; i < monitor_info.waiters_.size(); ++i) {
expandBufAddObjectId(reply, gRegistry->Add(monitor_info.waiters_[i]->GetPeer()));
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetOwnedMonitors(JDWP::ObjectId thread_id,
std::vector<JDWP::ObjectId>& monitors,
std::vector<uint32_t>& stack_depths) {
ScopedObjectAccessUnchecked soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
if (!IsSuspendedForDebugger(soa, thread)) {
return JDWP::ERR_THREAD_NOT_SUSPENDED;
}
struct OwnedMonitorVisitor : public StackVisitor {
OwnedMonitorVisitor(Thread* thread, Context* context)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: StackVisitor(thread, context), current_stack_depth(0) {}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
if (!GetMethod()->IsRuntimeMethod()) {
Monitor::VisitLocks(this, AppendOwnedMonitors, this);
++current_stack_depth;
}
return true;
}
static void AppendOwnedMonitors(mirror::Object* owned_monitor, void* arg) {
OwnedMonitorVisitor* visitor = reinterpret_cast<OwnedMonitorVisitor*>(arg);
visitor->monitors.push_back(owned_monitor);
visitor->stack_depths.push_back(visitor->current_stack_depth);
}
size_t current_stack_depth;
std::vector<mirror::Object*> monitors;
std::vector<uint32_t> stack_depths;
};
std::unique_ptr<Context> context(Context::Create());
OwnedMonitorVisitor visitor(thread, context.get());
visitor.WalkStack();
for (size_t i = 0; i < visitor.monitors.size(); ++i) {
monitors.push_back(gRegistry->Add(visitor.monitors[i]));
stack_depths.push_back(visitor.stack_depths[i]);
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetContendedMonitor(JDWP::ObjectId thread_id,
JDWP::ObjectId& contended_monitor) {
ScopedObjectAccessUnchecked soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
if (!IsSuspendedForDebugger(soa, thread)) {
return JDWP::ERR_THREAD_NOT_SUSPENDED;
}
contended_monitor = gRegistry->Add(Monitor::GetContendedMonitor(thread));
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetInstanceCounts(const std::vector<JDWP::RefTypeId>& class_ids,
std::vector<uint64_t>& counts)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
gc::Heap* heap = Runtime::Current()->GetHeap();
heap->CollectGarbage(false);
std::vector<mirror::Class*> classes;
counts.clear();
for (size_t i = 0; i < class_ids.size(); ++i) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_ids[i], status);
if (c == NULL) {
return status;
}
classes.push_back(c);
counts.push_back(0);
}
heap->CountInstances(classes, false, &counts[0]);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetInstances(JDWP::RefTypeId class_id, int32_t max_count, std::vector<JDWP::ObjectId>& instances)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
gc::Heap* heap = Runtime::Current()->GetHeap();
// We only want reachable instances, so do a GC.
heap->CollectGarbage(false);
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == nullptr) {
return status;
}
std::vector<mirror::Object*> raw_instances;
Runtime::Current()->GetHeap()->GetInstances(c, max_count, raw_instances);
for (size_t i = 0; i < raw_instances.size(); ++i) {
instances.push_back(gRegistry->Add(raw_instances[i]));
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetReferringObjects(JDWP::ObjectId object_id, int32_t max_count,
std::vector<JDWP::ObjectId>& referring_objects)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
gc::Heap* heap = Runtime::Current()->GetHeap();
heap->CollectGarbage(false);
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
std::vector<mirror::Object*> raw_instances;
heap->GetReferringObjects(o, max_count, raw_instances);
for (size_t i = 0; i < raw_instances.size(); ++i) {
referring_objects.push_back(gRegistry->Add(raw_instances[i]));
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::DisableCollection(JDWP::ObjectId object_id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
gRegistry->DisableCollection(object_id);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::EnableCollection(JDWP::ObjectId object_id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
// Unlike DisableCollection, JDWP specs do not state an invalid object causes an error. The RI
// also ignores these cases and never return an error. However it's not obvious why this command
// should behave differently from DisableCollection and IsCollected commands. So let's be more
// strict and return an error if this happens.
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
gRegistry->EnableCollection(object_id);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::IsCollected(JDWP::ObjectId object_id, bool& is_collected)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (object_id == 0) {
// Null object id is invalid.
return JDWP::ERR_INVALID_OBJECT;
}
// JDWP specs state an INVALID_OBJECT error is returned if the object ID is not valid. However
// the RI seems to ignore this and assume object has been collected.
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
is_collected = true;
} else {
is_collected = gRegistry->IsCollected(object_id);
}
return JDWP::ERR_NONE;
}
void Dbg::DisposeObject(JDWP::ObjectId object_id, uint32_t reference_count)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
gRegistry->DisposeObject(object_id, reference_count);
}
static JDWP::JdwpTypeTag GetTypeTag(mirror::Class* klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(klass != nullptr);
if (klass->IsArrayClass()) {
return JDWP::TT_ARRAY;
} else if (klass->IsInterface()) {
return JDWP::TT_INTERFACE;
} else {
return JDWP::TT_CLASS;
}
}
JDWP::JdwpError Dbg::GetReflectedType(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
JDWP::JdwpTypeTag type_tag = GetTypeTag(c);
expandBufAdd1(pReply, type_tag);
expandBufAddRefTypeId(pReply, class_id);
return JDWP::ERR_NONE;
}
void Dbg::GetClassList(std::vector<JDWP::RefTypeId>& classes) {
// Get the complete list of reference classes (i.e. all classes except
// the primitive types).
// Returns a newly-allocated buffer full of RefTypeId values.
struct ClassListCreator {
explicit ClassListCreator(std::vector<JDWP::RefTypeId>& classes) : classes(classes) {
}
static bool Visit(mirror::Class* c, void* arg) {
return reinterpret_cast<ClassListCreator*>(arg)->Visit(c);
}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
bool Visit(mirror::Class* c) NO_THREAD_SAFETY_ANALYSIS {
if (!c->IsPrimitive()) {
classes.push_back(gRegistry->AddRefType(c));
}
return true;
}
std::vector<JDWP::RefTypeId>& classes;
};
ClassListCreator clc(classes);
Runtime::Current()->GetClassLinker()->VisitClasses(ClassListCreator::Visit, &clc);
}
JDWP::JdwpError Dbg::GetClassInfo(JDWP::RefTypeId class_id, JDWP::JdwpTypeTag* pTypeTag, uint32_t* pStatus, std::string* pDescriptor) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
if (c->IsArrayClass()) {
*pStatus = JDWP::CS_VERIFIED | JDWP::CS_PREPARED;
*pTypeTag = JDWP::TT_ARRAY;
} else {
if (c->IsErroneous()) {
*pStatus = JDWP::CS_ERROR;
} else {
*pStatus = JDWP::CS_VERIFIED | JDWP::CS_PREPARED | JDWP::CS_INITIALIZED;
}
*pTypeTag = c->IsInterface() ? JDWP::TT_INTERFACE : JDWP::TT_CLASS;
}
if (pDescriptor != NULL) {
*pDescriptor = c->GetDescriptor();
}
return JDWP::ERR_NONE;
}
void Dbg::FindLoadedClassBySignature(const char* descriptor, std::vector<JDWP::RefTypeId>& ids) {
std::vector<mirror::Class*> classes;
Runtime::Current()->GetClassLinker()->LookupClasses(descriptor, classes);
ids.clear();
for (size_t i = 0; i < classes.size(); ++i) {
ids.push_back(gRegistry->Add(classes[i]));
}
}
JDWP::JdwpError Dbg::GetReferenceType(JDWP::ObjectId object_id, JDWP::ExpandBuf* pReply)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if (o == NULL || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
JDWP::JdwpTypeTag type_tag = GetTypeTag(o->GetClass());
JDWP::RefTypeId type_id = gRegistry->AddRefType(o->GetClass());
expandBufAdd1(pReply, type_tag);
expandBufAddRefTypeId(pReply, type_id);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetSignature(JDWP::RefTypeId class_id, std::string* signature) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
*signature = c->GetDescriptor();
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetSourceFile(JDWP::RefTypeId class_id, std::string& result) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
if (c->IsProxyClass()) {
return JDWP::ERR_ABSENT_INFORMATION;
}
result = c->GetSourceFile();
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetObjectTag(JDWP::ObjectId object_id, uint8_t& tag) {
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if (o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
tag = TagFromObject(soa, o);
return JDWP::ERR_NONE;
}
size_t Dbg::GetTagWidth(JDWP::JdwpTag tag) {
switch (tag) {
case JDWP::JT_VOID:
return 0;
case JDWP::JT_BYTE:
case JDWP::JT_BOOLEAN:
return 1;
case JDWP::JT_CHAR:
case JDWP::JT_SHORT:
return 2;
case JDWP::JT_FLOAT:
case JDWP::JT_INT:
return 4;
case JDWP::JT_ARRAY:
case JDWP::JT_OBJECT:
case JDWP::JT_STRING:
case JDWP::JT_THREAD:
case JDWP::JT_THREAD_GROUP:
case JDWP::JT_CLASS_LOADER:
case JDWP::JT_CLASS_OBJECT:
return sizeof(JDWP::ObjectId);
case JDWP::JT_DOUBLE:
case JDWP::JT_LONG:
return 8;
default:
LOG(FATAL) << "Unknown tag " << tag;
return -1;
}
}
JDWP::JdwpError Dbg::GetArrayLength(JDWP::ObjectId array_id, int& length) {
JDWP::JdwpError status;
mirror::Array* a = DecodeArray(array_id, status);
if (a == NULL) {
return status;
}
length = a->GetLength();
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::OutputArray(JDWP::ObjectId array_id, int offset, int count, JDWP::ExpandBuf* pReply) {
JDWP::JdwpError status;
mirror::Array* a = DecodeArray(array_id, status);
if (a == nullptr) {
return status;
}
if (offset < 0 || count < 0 || offset > a->GetLength() || a->GetLength() - offset < count) {
LOG(WARNING) << __FUNCTION__ << " access out of bounds: offset=" << offset << "; count=" << count;
return JDWP::ERR_INVALID_LENGTH;
}
std::string descriptor(a->GetClass()->GetDescriptor());
JDWP::JdwpTag tag = BasicTagFromDescriptor(descriptor.c_str() + 1);
expandBufAdd1(pReply, tag);
expandBufAdd4BE(pReply, count);
if (IsPrimitiveTag(tag)) {
size_t width = GetTagWidth(tag);
uint8_t* dst = expandBufAddSpace(pReply, count * width);
if (width == 8) {
const uint64_t* src8 = reinterpret_cast<uint64_t*>(a->GetRawData(sizeof(uint64_t), 0));
for (int i = 0; i < count; ++i) JDWP::Write8BE(&dst, src8[offset + i]);
} else if (width == 4) {
const uint32_t* src4 = reinterpret_cast<uint32_t*>(a->GetRawData(sizeof(uint32_t), 0));
for (int i = 0; i < count; ++i) JDWP::Write4BE(&dst, src4[offset + i]);
} else if (width == 2) {
const uint16_t* src2 = reinterpret_cast<uint16_t*>(a->GetRawData(sizeof(uint16_t), 0));
for (int i = 0; i < count; ++i) JDWP::Write2BE(&dst, src2[offset + i]);
} else {
const uint8_t* src = reinterpret_cast<uint8_t*>(a->GetRawData(sizeof(uint8_t), 0));
memcpy(dst, &src[offset * width], count * width);
}
} else {
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::ObjectArray<mirror::Object>* oa = a->AsObjectArray<mirror::Object>();
for (int i = 0; i < count; ++i) {
mirror::Object* element = oa->Get(offset + i);
JDWP::JdwpTag specific_tag = (element != nullptr) ? TagFromObject(soa, element)
: tag;
expandBufAdd1(pReply, specific_tag);
expandBufAddObjectId(pReply, gRegistry->Add(element));
}
}
return JDWP::ERR_NONE;
}
template <typename T>
static void CopyArrayData(mirror::Array* a, JDWP::Request& src, int offset, int count)
NO_THREAD_SAFETY_ANALYSIS {
// TODO: fix when annotalysis correctly handles non-member functions.
DCHECK(a->GetClass()->IsPrimitiveArray());
T* dst = reinterpret_cast<T*>(a->GetRawData(sizeof(T), offset));
for (int i = 0; i < count; ++i) {
*dst++ = src.ReadValue(sizeof(T));
}
}
JDWP::JdwpError Dbg::SetArrayElements(JDWP::ObjectId array_id, int offset, int count,
JDWP::Request& request)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
JDWP::JdwpError status;
mirror::Array* dst = DecodeArray(array_id, status);
if (dst == NULL) {
return status;
}
if (offset < 0 || count < 0 || offset > dst->GetLength() || dst->GetLength() - offset < count) {
LOG(WARNING) << __FUNCTION__ << " access out of bounds: offset=" << offset << "; count=" << count;
return JDWP::ERR_INVALID_LENGTH;
}
std::string descriptor = dst->GetClass()->GetDescriptor();
JDWP::JdwpTag tag = BasicTagFromDescriptor(descriptor.c_str() + 1);
if (IsPrimitiveTag(tag)) {
size_t width = GetTagWidth(tag);
if (width == 8) {
CopyArrayData<uint64_t>(dst, request, offset, count);
} else if (width == 4) {
CopyArrayData<uint32_t>(dst, request, offset, count);
} else if (width == 2) {
CopyArrayData<uint16_t>(dst, request, offset, count);
} else {
CopyArrayData<uint8_t>(dst, request, offset, count);
}
} else {
mirror::ObjectArray<mirror::Object>* oa = dst->AsObjectArray<mirror::Object>();
for (int i = 0; i < count; ++i) {
JDWP::ObjectId id = request.ReadObjectId();
mirror::Object* o = gRegistry->Get<mirror::Object*>(id);
if (o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
oa->Set<false>(offset + i, o);
}
}
return JDWP::ERR_NONE;
}
JDWP::ObjectId Dbg::CreateString(const std::string& str) {
return gRegistry->Add(mirror::String::AllocFromModifiedUtf8(Thread::Current(), str.c_str()));
}
JDWP::JdwpError Dbg::CreateObject(JDWP::RefTypeId class_id, JDWP::ObjectId& new_object) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
new_object = gRegistry->Add(c->AllocObject(Thread::Current()));
return JDWP::ERR_NONE;
}
/*
* Used by Eclipse's "Display" view to evaluate "new byte[5]" to get "(byte[]) [0, 0, 0, 0, 0]".
*/
JDWP::JdwpError Dbg::CreateArrayObject(JDWP::RefTypeId array_class_id, uint32_t length,
JDWP::ObjectId& new_array) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(array_class_id, status);
if (c == NULL) {
return status;
}
new_array = gRegistry->Add(mirror::Array::Alloc<true>(Thread::Current(), c, length,
c->GetComponentSize(),
Runtime::Current()->GetHeap()->GetCurrentAllocator()));
return JDWP::ERR_NONE;
}
bool Dbg::MatchType(JDWP::RefTypeId instance_class_id, JDWP::RefTypeId class_id) {
JDWP::JdwpError status;
mirror::Class* c1 = DecodeClass(instance_class_id, status);
CHECK(c1 != NULL);
mirror::Class* c2 = DecodeClass(class_id, status);
CHECK(c2 != NULL);
return c2->IsAssignableFrom(c1);
}
static JDWP::FieldId ToFieldId(const mirror::ArtField* f)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
CHECK(!kMovingFields);
return static_cast<JDWP::FieldId>(reinterpret_cast<uintptr_t>(f));
}
static JDWP::MethodId ToMethodId(const mirror::ArtMethod* m)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
CHECK(!kMovingMethods);
return static_cast<JDWP::MethodId>(reinterpret_cast<uintptr_t>(m));
}
static mirror::ArtField* FromFieldId(JDWP::FieldId fid)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
CHECK(!kMovingFields);
return reinterpret_cast<mirror::ArtField*>(static_cast<uintptr_t>(fid));
}
static mirror::ArtMethod* FromMethodId(JDWP::MethodId mid)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
CHECK(!kMovingMethods);
return reinterpret_cast<mirror::ArtMethod*>(static_cast<uintptr_t>(mid));
}
static void SetLocation(JDWP::JdwpLocation& location, mirror::ArtMethod* m, uint32_t dex_pc)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (m == NULL) {
memset(&location, 0, sizeof(location));
} else {
mirror::Class* c = m->GetDeclaringClass();
location.type_tag = GetTypeTag(c);
location.class_id = gRegistry->AddRefType(c);
location.method_id = ToMethodId(m);
location.dex_pc = (m->IsNative() || m->IsProxyMethod()) ? static_cast<uint64_t>(-1) : dex_pc;
}
}
std::string Dbg::GetMethodName(JDWP::MethodId method_id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::ArtMethod* m = FromMethodId(method_id);
return MethodHelper(m).GetName();
}
std::string Dbg::GetFieldName(JDWP::FieldId field_id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::ArtField* f = FromFieldId(field_id);
return FieldHelper(f).GetName();
}
/*
* Augment the access flags for synthetic methods and fields by setting
* the (as described by the spec) "0xf0000000 bit". Also, strip out any
* flags not specified by the Java programming language.
*/
static uint32_t MangleAccessFlags(uint32_t accessFlags) {
accessFlags &= kAccJavaFlagsMask;
if ((accessFlags & kAccSynthetic) != 0) {
accessFlags |= 0xf0000000;
}
return accessFlags;
}
/*
* Circularly shifts registers so that arguments come first. Debuggers
* expect slots to begin with arguments, but dex code places them at
* the end.
*/
static uint16_t MangleSlot(uint16_t slot, mirror::ArtMethod* m)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
const DexFile::CodeItem* code_item = MethodHelper(m).GetCodeItem();
if (code_item == nullptr) {
// We should not get here for a method without code (native, proxy or abstract). Log it and
// return the slot as is since all registers are arguments.
LOG(WARNING) << "Trying to mangle slot for method without code " << PrettyMethod(m);
return slot;
}
uint16_t ins_size = code_item->ins_size_;
uint16_t locals_size = code_item->registers_size_ - ins_size;
if (slot >= locals_size) {
return slot - locals_size;
} else {
return slot + ins_size;
}
}
/*
* Circularly shifts registers so that arguments come last. Reverts
* slots to dex style argument placement.
*/
static uint16_t DemangleSlot(uint16_t slot, mirror::ArtMethod* m)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
const DexFile::CodeItem* code_item = MethodHelper(m).GetCodeItem();
if (code_item == nullptr) {
// We should not get here for a method without code (native, proxy or abstract). Log it and
// return the slot as is since all registers are arguments.
LOG(WARNING) << "Trying to demangle slot for method without code " << PrettyMethod(m);
return slot;
}
uint16_t ins_size = code_item->ins_size_;
uint16_t locals_size = code_item->registers_size_ - ins_size;
if (slot < ins_size) {
return slot + locals_size;
} else {
return slot - ins_size;
}
}
JDWP::JdwpError Dbg::OutputDeclaredFields(JDWP::RefTypeId class_id, bool with_generic, JDWP::ExpandBuf* pReply) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
size_t instance_field_count = c->NumInstanceFields();
size_t static_field_count = c->NumStaticFields();
expandBufAdd4BE(pReply, instance_field_count + static_field_count);
for (size_t i = 0; i < instance_field_count + static_field_count; ++i) {
mirror::ArtField* f = (i < instance_field_count) ? c->GetInstanceField(i) : c->GetStaticField(i - instance_field_count);
FieldHelper fh(f);
expandBufAddFieldId(pReply, ToFieldId(f));
expandBufAddUtf8String(pReply, fh.GetName());
expandBufAddUtf8String(pReply, fh.GetTypeDescriptor());
if (with_generic) {
static const char genericSignature[1] = "";
expandBufAddUtf8String(pReply, genericSignature);
}
expandBufAdd4BE(pReply, MangleAccessFlags(f->GetAccessFlags()));
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::OutputDeclaredMethods(JDWP::RefTypeId class_id, bool with_generic,
JDWP::ExpandBuf* pReply) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(class_id, status);
if (c == NULL) {
return status;
}
size_t direct_method_count = c->NumDirectMethods();
size_t virtual_method_count = c->NumVirtualMethods();
expandBufAdd4BE(pReply, direct_method_count + virtual_method_count);
for (size_t i = 0; i < direct_method_count + virtual_method_count; ++i) {
mirror::ArtMethod* m = (i < direct_method_count) ? c->GetDirectMethod(i) : c->GetVirtualMethod(i - direct_method_count);
MethodHelper mh(m);
expandBufAddMethodId(pReply, ToMethodId(m));
expandBufAddUtf8String(pReply, mh.GetName());
expandBufAddUtf8String(pReply, mh.GetSignature().ToString());
if (with_generic) {
static const char genericSignature[1] = "";
expandBufAddUtf8String(pReply, genericSignature);
}
expandBufAdd4BE(pReply, MangleAccessFlags(m->GetAccessFlags()));
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::OutputDeclaredInterfaces(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply) {
JDWP::JdwpError status;
Thread* self = Thread::Current();
StackHandleScope<1> hs(self);
Handle<mirror::Class> c(hs.NewHandle(DecodeClass(class_id, status)));
if (c.Get() == nullptr) {
return status;
}
size_t interface_count = c->NumDirectInterfaces();
expandBufAdd4BE(pReply, interface_count);
for (size_t i = 0; i < interface_count; ++i) {
expandBufAddRefTypeId(pReply,
gRegistry->AddRefType(mirror::Class::GetDirectInterface(self, c, i)));
}
return JDWP::ERR_NONE;
}
void Dbg::OutputLineTable(JDWP::RefTypeId, JDWP::MethodId method_id, JDWP::ExpandBuf* pReply)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
struct DebugCallbackContext {
int numItems;
JDWP::ExpandBuf* pReply;
static bool Callback(void* context, uint32_t address, uint32_t line_number) {
DebugCallbackContext* pContext = reinterpret_cast<DebugCallbackContext*>(context);
expandBufAdd8BE(pContext->pReply, address);
expandBufAdd4BE(pContext->pReply, line_number);
pContext->numItems++;
return false;
}
};
mirror::ArtMethod* m = FromMethodId(method_id);
MethodHelper mh(m);
const DexFile::CodeItem* code_item = mh.GetCodeItem();
uint64_t start, end;
if (code_item == nullptr) {
DCHECK(m->IsNative() || m->IsProxyMethod());
start = -1;
end = -1;
} else {
start = 0;
// Return the index of the last instruction
end = code_item->insns_size_in_code_units_ - 1;
}
expandBufAdd8BE(pReply, start);
expandBufAdd8BE(pReply, end);
// Add numLines later
size_t numLinesOffset = expandBufGetLength(pReply);
expandBufAdd4BE(pReply, 0);
DebugCallbackContext context;
context.numItems = 0;
context.pReply = pReply;
if (code_item != nullptr) {
mh.GetDexFile().DecodeDebugInfo(code_item, m->IsStatic(), m->GetDexMethodIndex(),
DebugCallbackContext::Callback, NULL, &context);
}
JDWP::Set4BE(expandBufGetBuffer(pReply) + numLinesOffset, context.numItems);
}
void Dbg::OutputVariableTable(JDWP::RefTypeId, JDWP::MethodId method_id, bool with_generic, JDWP::ExpandBuf* pReply) {
struct DebugCallbackContext {
mirror::ArtMethod* method;
JDWP::ExpandBuf* pReply;
size_t variable_count;
bool with_generic;
static void Callback(void* context, uint16_t slot, uint32_t startAddress, uint32_t endAddress, const char* name, const char* descriptor, const char* signature)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DebugCallbackContext* pContext = reinterpret_cast<DebugCallbackContext*>(context);
VLOG(jdwp) << StringPrintf(" %2zd: %d(%d) '%s' '%s' '%s' actual slot=%d mangled slot=%d", pContext->variable_count, startAddress, endAddress - startAddress, name, descriptor, signature, slot, MangleSlot(slot, pContext->method));
slot = MangleSlot(slot, pContext->method);
expandBufAdd8BE(pContext->pReply, startAddress);
expandBufAddUtf8String(pContext->pReply, name);
expandBufAddUtf8String(pContext->pReply, descriptor);
if (pContext->with_generic) {
expandBufAddUtf8String(pContext->pReply, signature);
}
expandBufAdd4BE(pContext->pReply, endAddress - startAddress);
expandBufAdd4BE(pContext->pReply, slot);
++pContext->variable_count;
}
};
mirror::ArtMethod* m = FromMethodId(method_id);
MethodHelper mh(m);
// arg_count considers doubles and longs to take 2 units.
// variable_count considers everything to take 1 unit.
std::string shorty(mh.GetShorty());
expandBufAdd4BE(pReply, mirror::ArtMethod::NumArgRegisters(shorty));
// We don't know the total number of variables yet, so leave a blank and update it later.
size_t variable_count_offset = expandBufGetLength(pReply);
expandBufAdd4BE(pReply, 0);
DebugCallbackContext context;
context.method = m;
context.pReply = pReply;
context.variable_count = 0;
context.with_generic = with_generic;
const DexFile::CodeItem* code_item = mh.GetCodeItem();
if (code_item != nullptr) {
mh.GetDexFile().DecodeDebugInfo(code_item, m->IsStatic(), m->GetDexMethodIndex(), NULL,
DebugCallbackContext::Callback, &context);
}
JDWP::Set4BE(expandBufGetBuffer(pReply) + variable_count_offset, context.variable_count);
}
void Dbg::OutputMethodReturnValue(JDWP::MethodId method_id, const JValue* return_value,
JDWP::ExpandBuf* pReply) {
mirror::ArtMethod* m = FromMethodId(method_id);
JDWP::JdwpTag tag = BasicTagFromDescriptor(MethodHelper(m).GetShorty());
OutputJValue(tag, return_value, pReply);
}
void Dbg::OutputFieldValue(JDWP::FieldId field_id, const JValue* field_value,
JDWP::ExpandBuf* pReply) {
mirror::ArtField* f = FromFieldId(field_id);
JDWP::JdwpTag tag = BasicTagFromDescriptor(FieldHelper(f).GetTypeDescriptor());
OutputJValue(tag, field_value, pReply);
}
JDWP::JdwpError Dbg::GetBytecodes(JDWP::RefTypeId, JDWP::MethodId method_id,
std::vector<uint8_t>& bytecodes)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::ArtMethod* m = FromMethodId(method_id);
if (m == NULL) {
return JDWP::ERR_INVALID_METHODID;
}
MethodHelper mh(m);
const DexFile::CodeItem* code_item = mh.GetCodeItem();
size_t byte_count = code_item->insns_size_in_code_units_ * 2;
const uint8_t* begin = reinterpret_cast<const uint8_t*>(code_item->insns_);
const uint8_t* end = begin + byte_count;
for (const uint8_t* p = begin; p != end; ++p) {
bytecodes.push_back(*p);
}
return JDWP::ERR_NONE;
}
JDWP::JdwpTag Dbg::GetFieldBasicTag(JDWP::FieldId field_id) {
return BasicTagFromDescriptor(FieldHelper(FromFieldId(field_id)).GetTypeDescriptor());
}
JDWP::JdwpTag Dbg::GetStaticFieldBasicTag(JDWP::FieldId field_id) {
return BasicTagFromDescriptor(FieldHelper(FromFieldId(field_id)).GetTypeDescriptor());
}
static JDWP::JdwpError GetFieldValueImpl(JDWP::RefTypeId ref_type_id, JDWP::ObjectId object_id,
JDWP::FieldId field_id, JDWP::ExpandBuf* pReply,
bool is_static)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
JDWP::JdwpError status;
mirror::Class* c = DecodeClass(ref_type_id, status);
if (ref_type_id != 0 && c == NULL) {
return status;
}
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if ((!is_static && o == NULL) || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
mirror::ArtField* f = FromFieldId(field_id);
mirror::Class* receiver_class = c;
if (receiver_class == NULL && o != NULL) {
receiver_class = o->GetClass();
}
// TODO: should we give up now if receiver_class is NULL?
if (receiver_class != NULL && !f->GetDeclaringClass()->IsAssignableFrom(receiver_class)) {
LOG(INFO) << "ERR_INVALID_FIELDID: " << PrettyField(f) << " " << PrettyClass(receiver_class);
return JDWP::ERR_INVALID_FIELDID;
}
// The RI only enforces the static/non-static mismatch in one direction.
// TODO: should we change the tests and check both?
if (is_static) {
if (!f->IsStatic()) {
return JDWP::ERR_INVALID_FIELDID;
}
} else {
if (f->IsStatic()) {
LOG(WARNING) << "Ignoring non-NULL receiver for ObjectReference.SetValues on static field " << PrettyField(f);
}
}
if (f->IsStatic()) {
o = f->GetDeclaringClass();
}
JDWP::JdwpTag tag = BasicTagFromDescriptor(FieldHelper(f).GetTypeDescriptor());
JValue field_value;
if (tag == JDWP::JT_VOID) {
LOG(FATAL) << "Unknown tag: " << tag;
} else if (!IsPrimitiveTag(tag)) {
field_value.SetL(f->GetObject(o));
} else if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) {
field_value.SetJ(f->Get64(o));
} else {
field_value.SetI(f->Get32(o));
}
Dbg::OutputJValue(tag, &field_value, pReply);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id,
JDWP::ExpandBuf* pReply) {
return GetFieldValueImpl(0, object_id, field_id, pReply, false);
}
JDWP::JdwpError Dbg::GetStaticFieldValue(JDWP::RefTypeId ref_type_id, JDWP::FieldId field_id, JDWP::ExpandBuf* pReply) {
return GetFieldValueImpl(ref_type_id, 0, field_id, pReply, true);
}
static JDWP::JdwpError SetFieldValueImpl(JDWP::ObjectId object_id, JDWP::FieldId field_id,
uint64_t value, int width, bool is_static)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id);
if ((!is_static && o == NULL) || o == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
mirror::ArtField* f = FromFieldId(field_id);
// The RI only enforces the static/non-static mismatch in one direction.
// TODO: should we change the tests and check both?
if (is_static) {
if (!f->IsStatic()) {
return JDWP::ERR_INVALID_FIELDID;
}
} else {
if (f->IsStatic()) {
LOG(WARNING) << "Ignoring non-NULL receiver for ObjectReference.SetValues on static field " << PrettyField(f);
}
}
if (f->IsStatic()) {
o = f->GetDeclaringClass();
}
JDWP::JdwpTag tag = BasicTagFromDescriptor(FieldHelper(f).GetTypeDescriptor());
if (IsPrimitiveTag(tag)) {
if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) {
CHECK_EQ(width, 8);
// Debugging can't use transactional mode (runtime only).
f->Set64<false>(o, value);
} else {
CHECK_LE(width, 4);
// Debugging can't use transactional mode (runtime only).
f->Set32<false>(o, value);
}
} else {
mirror::Object* v = gRegistry->Get<mirror::Object*>(value);
if (v == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
if (v != NULL) {
mirror::Class* field_type = FieldHelper(f).GetType();
if (!field_type->IsAssignableFrom(v->GetClass())) {
return JDWP::ERR_INVALID_OBJECT;
}
}
// Debugging can't use transactional mode (runtime only).
f->SetObject<false>(o, v);
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::SetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id, uint64_t value,
int width) {
return SetFieldValueImpl(object_id, field_id, value, width, false);
}
JDWP::JdwpError Dbg::SetStaticFieldValue(JDWP::FieldId field_id, uint64_t value, int width) {
return SetFieldValueImpl(0, field_id, value, width, true);
}
std::string Dbg::StringToUtf8(JDWP::ObjectId string_id) {
mirror::String* s = gRegistry->Get<mirror::String*>(string_id);
return s->ToModifiedUtf8();
}
void Dbg::OutputJValue(JDWP::JdwpTag tag, const JValue* return_value, JDWP::ExpandBuf* pReply) {
if (IsPrimitiveTag(tag)) {
expandBufAdd1(pReply, tag);
if (tag == JDWP::JT_BOOLEAN || tag == JDWP::JT_BYTE) {
expandBufAdd1(pReply, return_value->GetI());
} else if (tag == JDWP::JT_CHAR || tag == JDWP::JT_SHORT) {
expandBufAdd2BE(pReply, return_value->GetI());
} else if (tag == JDWP::JT_FLOAT || tag == JDWP::JT_INT) {
expandBufAdd4BE(pReply, return_value->GetI());
} else if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) {
expandBufAdd8BE(pReply, return_value->GetJ());
} else {
CHECK_EQ(tag, JDWP::JT_VOID);
}
} else {
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::Object* value = return_value->GetL();
expandBufAdd1(pReply, TagFromObject(soa, value));
expandBufAddObjectId(pReply, gRegistry->Add(value));
}
}
JDWP::JdwpError Dbg::GetThreadName(JDWP::ObjectId thread_id, std::string& name) {
ScopedObjectAccessUnchecked soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE && error != JDWP::ERR_THREAD_NOT_ALIVE) {
return error;
}
// We still need to report the zombie threads' names, so we can't just call Thread::GetThreadName.
mirror::Object* thread_object = gRegistry->Get<mirror::Object*>(thread_id);
mirror::ArtField* java_lang_Thread_name_field =
soa.DecodeField(WellKnownClasses::java_lang_Thread_name);
mirror::String* s =
reinterpret_cast<mirror::String*>(java_lang_Thread_name_field->GetObject(thread_object));
if (s != NULL) {
name = s->ToModifiedUtf8();
}
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetThreadGroup(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply) {
ScopedObjectAccess soa(Thread::Current());
mirror::Object* thread_object = gRegistry->Get<mirror::Object*>(thread_id);
if (thread_object == ObjectRegistry::kInvalidObject) {
return JDWP::ERR_INVALID_OBJECT;
}
const char* old_cause = soa.Self()->StartAssertNoThreadSuspension("Debugger: GetThreadGroup");
// Okay, so it's an object, but is it actually a thread?
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error == JDWP::ERR_THREAD_NOT_ALIVE) {
// Zombie threads are in the null group.
expandBufAddObjectId(pReply, JDWP::ObjectId(0));
error = JDWP::ERR_NONE;
} else if (error == JDWP::ERR_NONE) {
mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread);
CHECK(c != nullptr);
mirror::ArtField* f = c->FindInstanceField("group", "Ljava/lang/ThreadGroup;");
CHECK(f != NULL);
mirror::Object* group = f->GetObject(thread_object);
CHECK(group != NULL);
JDWP::ObjectId thread_group_id = gRegistry->Add(group);
expandBufAddObjectId(pReply, thread_group_id);
}
soa.Self()->EndAssertNoThreadSuspension(old_cause);
return error;
}
std::string Dbg::GetThreadGroupName(JDWP::ObjectId thread_group_id) {
ScopedObjectAccess soa(Thread::Current());
mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id);
CHECK(thread_group != nullptr);
const char* old_cause = soa.Self()->StartAssertNoThreadSuspension("Debugger: GetThreadGroupName");
mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup);
CHECK(c != nullptr);
mirror::ArtField* f = c->FindInstanceField("name", "Ljava/lang/String;");
CHECK(f != NULL);
mirror::String* s = reinterpret_cast<mirror::String*>(f->GetObject(thread_group));
soa.Self()->EndAssertNoThreadSuspension(old_cause);
return s->ToModifiedUtf8();
}
JDWP::ObjectId Dbg::GetThreadGroupParent(JDWP::ObjectId thread_group_id) {
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id);
CHECK(thread_group != nullptr);
const char* old_cause = soa.Self()->StartAssertNoThreadSuspension("Debugger: GetThreadGroupParent");
mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup);
CHECK(c != nullptr);
mirror::ArtField* f = c->FindInstanceField("parent", "Ljava/lang/ThreadGroup;");
CHECK(f != NULL);
mirror::Object* parent = f->GetObject(thread_group);
soa.Self()->EndAssertNoThreadSuspension(old_cause);
return gRegistry->Add(parent);
}
JDWP::ObjectId Dbg::GetSystemThreadGroupId() {
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_systemThreadGroup);
mirror::Object* group = f->GetObject(f->GetDeclaringClass());
return gRegistry->Add(group);
}
JDWP::ObjectId Dbg::GetMainThreadGroupId() {
ScopedObjectAccess soa(Thread::Current());
mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_mainThreadGroup);
mirror::Object* group = f->GetObject(f->GetDeclaringClass());
return gRegistry->Add(group);
}
JDWP::JdwpThreadStatus Dbg::ToJdwpThreadStatus(ThreadState state) {
switch (state) {
case kBlocked:
return JDWP::TS_MONITOR;
case kNative:
case kRunnable:
case kSuspended:
return JDWP::TS_RUNNING;
case kSleeping:
return JDWP::TS_SLEEPING;
case kStarting:
case kTerminated:
return JDWP::TS_ZOMBIE;
case kTimedWaiting:
case kWaitingForDebuggerSend:
case kWaitingForDebuggerSuspension:
case kWaitingForDebuggerToAttach:
case kWaitingForDeoptimization:
case kWaitingForGcToComplete:
case kWaitingForCheckPointsToRun:
case kWaitingForJniOnLoad:
case kWaitingForSignalCatcherOutput:
case kWaitingInMainDebuggerLoop:
case kWaitingInMainSignalCatcherLoop:
case kWaitingPerformingGc:
case kWaiting:
return JDWP::TS_WAIT;
// Don't add a 'default' here so the compiler can spot incompatible enum changes.
}
LOG(FATAL) << "Unknown thread state: " << state;
return JDWP::TS_ZOMBIE;
}
JDWP::JdwpError Dbg::GetThreadStatus(JDWP::ObjectId thread_id, JDWP::JdwpThreadStatus* pThreadStatus,
JDWP::JdwpSuspendStatus* pSuspendStatus) {
ScopedObjectAccess soa(Thread::Current());
*pSuspendStatus = JDWP::SUSPEND_STATUS_NOT_SUSPENDED;
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
if (error == JDWP::ERR_THREAD_NOT_ALIVE) {
*pThreadStatus = JDWP::TS_ZOMBIE;
return JDWP::ERR_NONE;
}
return error;
}
if (IsSuspendedForDebugger(soa, thread)) {
*pSuspendStatus = JDWP::SUSPEND_STATUS_SUSPENDED;
}
*pThreadStatus = ToJdwpThreadStatus(thread->GetState());
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetThreadDebugSuspendCount(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply) {
ScopedObjectAccess soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_);
expandBufAdd4BE(pReply, thread->GetDebugSuspendCount());
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::Interrupt(JDWP::ObjectId thread_id) {
ScopedObjectAccess soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
thread->Interrupt(soa.Self());
return JDWP::ERR_NONE;
}
void Dbg::GetThreads(JDWP::ObjectId thread_group_id, std::vector<JDWP::ObjectId>& thread_ids) {
class ThreadListVisitor {
public:
ThreadListVisitor(const ScopedObjectAccessUnchecked& soa, mirror::Object* desired_thread_group,
std::vector<JDWP::ObjectId>& thread_ids)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: soa_(soa), desired_thread_group_(desired_thread_group), thread_ids_(thread_ids) {}
static void Visit(Thread* t, void* arg) {
reinterpret_cast<ThreadListVisitor*>(arg)->Visit(t);
}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
void Visit(Thread* t) NO_THREAD_SAFETY_ANALYSIS {
if (t == Dbg::GetDebugThread()) {
// Skip the JDWP thread. Some debuggers get bent out of shape when they can't suspend and
// query all threads, so it's easier if we just don't tell them about this thread.
return;
}
mirror::Object* peer = t->GetPeer();
if (IsInDesiredThreadGroup(peer)) {
thread_ids_.push_back(gRegistry->Add(peer));
}
}
private:
bool IsInDesiredThreadGroup(mirror::Object* peer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// peer might be NULL if the thread is still starting up.
if (peer == NULL) {
// We can't tell the debugger about this thread yet.
// TODO: if we identified threads to the debugger by their Thread*
// rather than their peer's mirror::Object*, we could fix this.
// Doing so might help us report ZOMBIE threads too.
return false;
}
// Do we want threads from all thread groups?
if (desired_thread_group_ == NULL) {
return true;
}
mirror::Object* group = soa_.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(peer);
return (group == desired_thread_group_);
}
const ScopedObjectAccessUnchecked& soa_;
mirror::Object* const desired_thread_group_;
std::vector<JDWP::ObjectId>& thread_ids_;
};
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id);
ThreadListVisitor tlv(soa, thread_group, thread_ids);
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Runtime::Current()->GetThreadList()->ForEach(ThreadListVisitor::Visit, &tlv);
}
void Dbg::GetChildThreadGroups(JDWP::ObjectId thread_group_id, std::vector<JDWP::ObjectId>& child_thread_group_ids) {
ScopedObjectAccess soa(Thread::Current());
mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id);
// Get the ArrayList<ThreadGroup> "groups" out of this thread group...
mirror::ArtField* groups_field = thread_group->GetClass()->FindInstanceField("groups", "Ljava/util/List;");
mirror::Object* groups_array_list = groups_field->GetObject(thread_group);
// Get the array and size out of the ArrayList<ThreadGroup>...
mirror::ArtField* array_field = groups_array_list->GetClass()->FindInstanceField("array", "[Ljava/lang/Object;");
mirror::ArtField* size_field = groups_array_list->GetClass()->FindInstanceField("size", "I");
mirror::ObjectArray<mirror::Object>* groups_array =
array_field->GetObject(groups_array_list)->AsObjectArray<mirror::Object>();
const int32_t size = size_field->GetInt(groups_array_list);
// Copy the first 'size' elements out of the array into the result.
for (int32_t i = 0; i < size; ++i) {
child_thread_group_ids.push_back(gRegistry->Add(groups_array->Get(i)));
}
}
static int GetStackDepth(Thread* thread)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
struct CountStackDepthVisitor : public StackVisitor {
explicit CountStackDepthVisitor(Thread* thread)
: StackVisitor(thread, NULL), depth(0) {}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
if (!GetMethod()->IsRuntimeMethod()) {
++depth;
}
return true;
}
size_t depth;
};
CountStackDepthVisitor visitor(thread);
visitor.WalkStack();
return visitor.depth;
}
JDWP::JdwpError Dbg::GetThreadFrameCount(JDWP::ObjectId thread_id, size_t& result) {
ScopedObjectAccess soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
if (!IsSuspendedForDebugger(soa, thread)) {
return JDWP::ERR_THREAD_NOT_SUSPENDED;
}
result = GetStackDepth(thread);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetThreadFrames(JDWP::ObjectId thread_id, size_t start_frame,
size_t frame_count, JDWP::ExpandBuf* buf) {
class GetFrameVisitor : public StackVisitor {
public:
GetFrameVisitor(Thread* thread, size_t start_frame, size_t frame_count, JDWP::ExpandBuf* buf)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: StackVisitor(thread, NULL), depth_(0),
start_frame_(start_frame), frame_count_(frame_count), buf_(buf) {
expandBufAdd4BE(buf_, frame_count_);
}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
virtual bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
if (GetMethod()->IsRuntimeMethod()) {
return true; // The debugger can't do anything useful with a frame that has no Method*.
}
if (depth_ >= start_frame_ + frame_count_) {
return false;
}
if (depth_ >= start_frame_) {
JDWP::FrameId frame_id(GetFrameId());
JDWP::JdwpLocation location;
SetLocation(location, GetMethod(), GetDexPc());
VLOG(jdwp) << StringPrintf(" Frame %3zd: id=%3" PRIu64 " ", depth_, frame_id) << location;
expandBufAdd8BE(buf_, frame_id);
expandBufAddLocation(buf_, location);
}
++depth_;
return true;
}
private:
size_t depth_;
const size_t start_frame_;
const size_t frame_count_;
JDWP::ExpandBuf* buf_;
};
ScopedObjectAccessUnchecked soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
Thread* thread;
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
if (!IsSuspendedForDebugger(soa, thread)) {
return JDWP::ERR_THREAD_NOT_SUSPENDED;
}
GetFrameVisitor visitor(thread, start_frame, frame_count, buf);
visitor.WalkStack();
return JDWP::ERR_NONE;
}
JDWP::ObjectId Dbg::GetThreadSelfId() {
ScopedObjectAccessUnchecked soa(Thread::Current());
return gRegistry->Add(soa.Self()->GetPeer());
}
void Dbg::SuspendVM() {
Runtime::Current()->GetThreadList()->SuspendAllForDebugger();
}
void Dbg::ResumeVM() {
Runtime::Current()->GetThreadList()->UndoDebuggerSuspensions();
}
JDWP::JdwpError Dbg::SuspendThread(JDWP::ObjectId thread_id, bool request_suspension) {
ScopedLocalRef<jobject> peer(Thread::Current()->GetJniEnv(), NULL);
{
ScopedObjectAccess soa(Thread::Current());
peer.reset(soa.AddLocalReference<jobject>(gRegistry->Get<mirror::Object*>(thread_id)));
}
if (peer.get() == NULL) {
return JDWP::ERR_THREAD_NOT_ALIVE;
}
// Suspend thread to build stack trace.
bool timed_out;
Thread* thread = ThreadList::SuspendThreadByPeer(peer.get(), request_suspension, true,
&timed_out);
if (thread != NULL) {
return JDWP::ERR_NONE;
} else if (timed_out) {
return JDWP::ERR_INTERNAL;
} else {
return JDWP::ERR_THREAD_NOT_ALIVE;
}
}
void Dbg::ResumeThread(JDWP::ObjectId thread_id) {
ScopedObjectAccessUnchecked soa(Thread::Current());
mirror::Object* peer = gRegistry->Get<mirror::Object*>(thread_id);
Thread* thread;
{
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
thread = Thread::FromManagedThread(soa, peer);
}
if (thread == NULL) {
LOG(WARNING) << "No such thread for resume: " << peer;
return;
}
bool needs_resume;
{
MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_);
needs_resume = thread->GetSuspendCount() > 0;
}
if (needs_resume) {
Runtime::Current()->GetThreadList()->Resume(thread, true);
}
}
void Dbg::SuspendSelf() {
Runtime::Current()->GetThreadList()->SuspendSelfForDebugger();
}
struct GetThisVisitor : public StackVisitor {
GetThisVisitor(Thread* thread, Context* context, JDWP::FrameId frame_id)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: StackVisitor(thread, context), this_object(NULL), frame_id(frame_id) {}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
virtual bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
if (frame_id != GetFrameId()) {
return true; // continue
} else {
this_object = GetThisObject();
return false;
}
}
mirror::Object* this_object;
JDWP::FrameId frame_id;
};
JDWP::JdwpError Dbg::GetThisObject(JDWP::ObjectId thread_id, JDWP::FrameId frame_id,
JDWP::ObjectId* result) {
ScopedObjectAccessUnchecked soa(Thread::Current());
Thread* thread;
{
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
JDWP::JdwpError error = DecodeThread(soa, thread_id, thread);
if (error != JDWP::ERR_NONE) {
return error;
}
if (!IsSuspendedForDebugger(soa, thread)) {
return JDWP::ERR_THREAD_NOT_SUSPENDED;
}
}
std::unique_ptr<Context> context(Context::Create());
GetThisVisitor visitor(thread, context.get(), frame_id);
visitor.WalkStack();
*result = gRegistry->Add(visitor.this_object);
return JDWP::ERR_NONE;
}
JDWP::JdwpError Dbg::GetLocalValue(JDWP::ObjectId thread_id, JDWP::FrameId frame_id, int slot,
JDWP::JdwpTag tag, uint8_t* buf, size_t width) {
struct GetLocalVisitor : public StackVisitor {
GetLocalVisitor(const ScopedObjectAccessUnchecked& soa, Thread* thread, Context* context,
JDWP::FrameId frame_id, int slot, JDWP::JdwpTag tag, uint8_t* buf, size_t width)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: StackVisitor(thread, context), soa_(soa), frame_id_(frame_id), slot_(slot), tag_(tag),
buf_(buf), width_(width), error_(JDWP::ERR_NONE) {}
// TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses
// annotalysis.
bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
if (GetFrameId() != frame_id_) {
return true; // Not our frame, carry on.
}
// TODO: check that the tag is compatible with the actual type of the slot!
// TODO: check slot is valid for this method or return INVALID_SLOT error.
mirror::ArtMethod* m = GetMethod();
if (m->IsNative()) {
// We can't read local value from native method.
error_ = JDWP::ERR_OPAQUE_FRAME;
return false;
}
uint16_t reg = DemangleSlot(slot_, m);
switch (tag_) {
case JDWP::JT_BOOLEAN:
{
CHECK_EQ(width_, 1U);
uint32_t intVal = GetVReg(m, reg, kIntVReg);
VLOG(jdwp) << "get boolean local " << reg << " = " << intVal;
JDWP::Set1(buf_+1, intVal != 0);
}
break;
case JDWP::JT_BYTE:
{
CHECK_EQ(width_, 1U);
uint32_t intVal = GetVReg(m, reg, kIntVReg);
VLOG(jdwp) << "get byte local " << reg << " = " << intVal;
JDWP::Set1(buf_+1, intVal);
}
break;
case JDWP::JT_SHORT:
case JDWP::JT_CHAR:
{
CHECK_EQ(width_, 2U);
uint32_t intVal = GetVReg(m, reg, kIntVReg);
VLOG(jdwp) << "get short/char local " << reg << " = " << intVal;
JDWP::Set2BE(buf_+1, intVal);
}
break;
case JDWP::JT_INT:
{
CHECK_EQ(width_, 4U);
uint32_t intVal = GetVReg(m, reg, kIntVReg);
VLOG(jdwp) << "get int local " << reg << " = " << intVal;
JDWP::Set4BE(buf_+1, intVal);
}
break;
case JDWP::JT_FLOAT:
{
CHECK_EQ(width_, 4U);
uint32_t intVal = GetVReg(m, reg, kFloatVReg);
VLOG(jdwp) << "get int/float local " << reg << " = " << intVal;
JDWP::Set4BE(buf_+1, intVal);
}
break;
case JDWP::JT_ARRAY:
{
CHECK_EQ(width_, sizeof(JDWP::ObjectId));
mirror::Object* o = reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kReferenceVReg));
VLOG(jdwp) << "get array local " << reg << " = " << o;
if (!Runtime::Current()->GetHeap()->IsValidObjectAddress(o)) {
LOG(FATAL) << "Register " << reg << " expected to hold array: " << o;
}
JDWP::SetObjectId(buf_+1, gRegistry->Add(o));
}
break;
case JDWP::JT_CLASS_LOADER:
case JDWP::JT_CLASS_OBJECT:
case JDWP::JT_OBJECT:
case JDWP::JT_STRING:
case JDWP::JT_THREAD:
case JDWP::JT_THREAD_GROUP:
{
CHECK_EQ(width_, sizeof(JDWP::ObjectId));
mirror::Object* o = reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kReferenceVReg));
VLOG(jdwp) << "get object local " << reg << " = " << o;
if (!Runtime::Current()->GetHeap()->IsValidObjectAddress(o)) {
LOG(FATAL) << "Register " << reg << " expected to hold object: " << o;
}
tag_ = TagFromObject(soa_, o);
JDWP::SetObjectId(buf_+1, gRegistry->Add(o));
}
break;
case JDWP::JT_DOUBLE:
{
CHECK_EQ(width_, 8U);
uint32_t lo = GetVReg(m, reg, kDoubleLoVReg);
uint64_t hi = GetVReg(m, reg + 1, kDoubleHiVReg);
uint64_t longVal = (hi << 32) | lo;
VLOG(jdwp) << "get double/long local " << hi << ":" << lo << " = " << longVal;
JDWP::Set8BE(buf_+1, longVal);
}
break;
case JDWP::JT_LONG:
{
CHECK_EQ(width_, 8U);
uint32_t lo = GetVReg(m, reg, kLongLoVReg);
uint64_t hi = GetVReg(m, reg + 1, kLongHiVReg);
uint64_t longVal = (hi << 32) | lo;
VLOG(jdwp) << "get double/long local " << hi << ":" << lo << " = " << longVal;
JDWP::Set8BE(buf_+1, longVal);
}
break;
default:
LOG(FATAL) << "Unknown tag " << tag_;
break;
}
// Prepend tag, which may have been updated.
JDWP::Set1(buf_, tag_);
return false;
}
const ScopedObjectAccessUnchecked& soa_;
const JDWP::FrameId frame_id_;
const int slot_;
JDWP::JdwpTag tag_;
uint8_t* const buf_;
const size_t width_;
JDWP::JdwpError error_;
};
ScopedObjectAccessUnchecked soa(Thread::Current());
MutexLock mu(soa.Self(), *Locks::thread_list_lock_);