/*
* 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.
*/
/*
* Dalvik-specific side of debugger support. (The JDWP code is intended to
* be relatively generic.)
*/
#ifndef ART_RUNTIME_DEBUGGER_H_
#define ART_RUNTIME_DEBUGGER_H_
#include <pthread.h>
#include <set>
#include <string>
#include <vector>
#include "base/array_ref.h"
#include "class_linker.h"
#include "gc_root.h"
#include "handle.h"
#include "jdwp/jdwp.h"
#include "jni.h"
#include "jvalue.h"
#include "obj_ptr.h"
#include "runtime_callbacks.h"
#include "thread.h"
#include "thread_state.h"
namespace art {
namespace mirror {
class Class;
class Object;
class Throwable;
} // namespace mirror
class ArtField;
class ArtMethod;
class ObjectRegistry;
class ScopedObjectAccess;
class ScopedObjectAccessUnchecked;
class StackVisitor;
class Thread;
struct DebuggerActiveMethodInspectionCallback : public MethodInspectionCallback {
bool IsMethodBeingInspected(ArtMethod* method) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
bool IsMethodSafeToJit(ArtMethod* method) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
bool MethodNeedsDebugVersion(ArtMethod* method) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
};
struct DebuggerDdmCallback : public DdmCallback {
void DdmPublishChunk(uint32_t type, const ArrayRef<const uint8_t>& data)
OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
};
struct InternalDebuggerControlCallback : public DebuggerControlCallback {
void StartDebugger() OVERRIDE;
void StopDebugger() OVERRIDE;
bool IsDebuggerConfigured() OVERRIDE;
};
/*
* Invoke-during-breakpoint support.
*/
struct DebugInvokeReq {
DebugInvokeReq(uint32_t invoke_request_id, JDWP::ObjectId invoke_thread_id,
mirror::Object* invoke_receiver, mirror::Class* invoke_class,
ArtMethod* invoke_method, uint32_t invoke_options,
uint64_t args[], uint32_t args_count)
: request_id(invoke_request_id), thread_id(invoke_thread_id), receiver(invoke_receiver),
klass(invoke_class), method(invoke_method), arg_count(args_count), arg_values(args),
options(invoke_options), reply(JDWP::expandBufAlloc()) {
}
~DebugInvokeReq() {
JDWP::expandBufFree(reply);
}
// Request
const uint32_t request_id;
const JDWP::ObjectId thread_id;
GcRoot<mirror::Object> receiver; // not used for ClassType.InvokeMethod.
GcRoot<mirror::Class> klass;
ArtMethod* const method;
const uint32_t arg_count;
std::unique_ptr<uint64_t[]> arg_values; // will be null if arg_count_ == 0. We take ownership
// of this array so we must delete it upon destruction.
const uint32_t options;
// Reply
JDWP::ExpandBuf* const reply;
void VisitRoots(RootVisitor* visitor, const RootInfo& root_info)
REQUIRES_SHARED(Locks::mutator_lock_);
private:
DISALLOW_COPY_AND_ASSIGN(DebugInvokeReq);
};
// Thread local data-structure that holds fields for controlling single-stepping.
class SingleStepControl {
public:
SingleStepControl(JDWP::JdwpStepSize step_size, JDWP::JdwpStepDepth step_depth,
int stack_depth, ArtMethod* method)
: step_size_(step_size), step_depth_(step_depth),
stack_depth_(stack_depth), method_(method) {
}
JDWP::JdwpStepSize GetStepSize() const {
return step_size_;
}
JDWP::JdwpStepDepth GetStepDepth() const {
return step_depth_;
}
int GetStackDepth() const {
return stack_depth_;
}
ArtMethod* GetMethod() const {
return method_;
}
const std::set<uint32_t>& GetDexPcs() const {
return dex_pcs_;
}
void AddDexPc(uint32_t dex_pc);
bool ContainsDexPc(uint32_t dex_pc) const;
private:
// See JdwpStepSize and JdwpStepDepth for details.
const JDWP::JdwpStepSize step_size_;
const JDWP::JdwpStepDepth step_depth_;
// The stack depth when this single-step was initiated. This is used to support SD_OVER and SD_OUT
// single-step depth.
const int stack_depth_;
// The location this single-step was initiated from.
// A single-step is initiated in a suspended thread. We save here the current method and the
// set of DEX pcs associated to the source line number where the suspension occurred.
// This is used to support SD_INTO and SD_OVER single-step depths so we detect when a single-step
// causes the execution of an instruction in a different method or at a different line number.
ArtMethod* method_;
std::set<uint32_t> dex_pcs_;
DISALLOW_COPY_AND_ASSIGN(SingleStepControl);
};
// TODO rename to InstrumentationRequest.
class DeoptimizationRequest {
public:
enum Kind {
kNothing, // no action.
kRegisterForEvent, // start listening for instrumentation event.
kUnregisterForEvent, // stop listening for instrumentation event.
kFullDeoptimization, // deoptimize everything.
kFullUndeoptimization, // undeoptimize everything.
kSelectiveDeoptimization, // deoptimize one method.
kSelectiveUndeoptimization // undeoptimize one method.
};
DeoptimizationRequest() : kind_(kNothing), instrumentation_event_(0), method_(nullptr) {}
DeoptimizationRequest(const DeoptimizationRequest& other)
REQUIRES_SHARED(Locks::mutator_lock_)
: kind_(other.kind_), instrumentation_event_(other.instrumentation_event_) {
// Create a new JNI global reference for the method.
SetMethod(other.Method());
}
ArtMethod* Method() const REQUIRES_SHARED(Locks::mutator_lock_);
void SetMethod(ArtMethod* m) REQUIRES_SHARED(Locks::mutator_lock_);
// Name 'Kind()' would collide with the above enum name.
Kind GetKind() const {
return kind_;
}
void SetKind(Kind kind) {
kind_ = kind;
}
uint32_t InstrumentationEvent() const {
return instrumentation_event_;
}
void SetInstrumentationEvent(uint32_t instrumentation_event) {
instrumentation_event_ = instrumentation_event;
}
private:
Kind kind_;
// TODO we could use a union to hold the instrumentation_event and the method since they
// respectively have sense only for kRegisterForEvent/kUnregisterForEvent and
// kSelectiveDeoptimization/kSelectiveUndeoptimization.
// Event to start or stop listening to. Only for kRegisterForEvent and kUnregisterForEvent.
uint32_t instrumentation_event_;
// Method for selective deoptimization.
jmethodID method_;
};
std::ostream& operator<<(std::ostream& os, const DeoptimizationRequest::Kind& rhs);
class Dbg {
public:
static void SetJdwpAllowed(bool allowed);
static bool IsJdwpAllowed();
static void StartJdwp();
static void StopJdwp();
// Invoked by the GC in case we need to keep DDMS informed.
static void GcDidFinish() REQUIRES(!Locks::mutator_lock_);
// Return the DebugInvokeReq for the current thread.
static DebugInvokeReq* GetInvokeReq();
static Thread* GetDebugThread();
static void ClearWaitForEventThread();
/*
* Enable/disable breakpoints and step modes. Used to provide a heads-up
* when the debugger attaches.
*/
static void Connected();
static void GoActive()
REQUIRES(!Locks::breakpoint_lock_, !Locks::deoptimization_lock_, !Locks::mutator_lock_);
static void Disconnected() REQUIRES(!Locks::deoptimization_lock_, !Locks::mutator_lock_);
static void Dispose() {
gDisposed = true;
}
// Returns true if we're actually debugging with a real debugger, false if it's
// just DDMS (or nothing at all).
static bool IsDebuggerActive() {
return gDebuggerActive;
}
// Configures JDWP with parsed command-line options.
static void ConfigureJdwp(const JDWP::JdwpOptions& jdwp_options)
REQUIRES_SHARED(Locks::mutator_lock_);
// Returns true if we had -Xrunjdwp or -agentlib:jdwp= on the command line.
static bool IsJdwpConfigured();
// Returns true if a method has any breakpoints.
static bool MethodHasAnyBreakpoints(ArtMethod* method)
REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Locks::breakpoint_lock_);
static bool IsDisposed() {
return gDisposed;
}
/*
* Time, in milliseconds, since the last debugger activity. Does not
* include DDMS activity. Returns -1 if there has been no activity.
* Returns 0 if we're in the middle of handling a debugger request.
*/
static int64_t LastDebuggerActivity();
static void UndoDebuggerSuspensions()
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
/*
* Class, Object, Array
*/
static std::string GetClassName(JDWP::RefTypeId id)
REQUIRES_SHARED(Locks::mutator_lock_);
static std::string GetClassName(mirror::Class* klass)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetClassObject(JDWP::RefTypeId id, JDWP::ObjectId* class_object_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetSuperclass(JDWP::RefTypeId id, JDWP::RefTypeId* superclass_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetClassLoader(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetModifiers(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetReflectedType(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static void GetClassList(std::vector<JDWP::RefTypeId>* classes)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetClassInfo(JDWP::RefTypeId class_id, JDWP::JdwpTypeTag* pTypeTag,
uint32_t* pStatus, std::string* pDescriptor)
REQUIRES_SHARED(Locks::mutator_lock_);
static void FindLoadedClassBySignature(const char* descriptor, std::vector<JDWP::RefTypeId>* ids)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetReferenceType(JDWP::ObjectId object_id, JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetSignature(JDWP::RefTypeId ref_type_id, std::string* signature)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetSourceDebugExtension(JDWP::RefTypeId ref_type_id,
std::string* extension_data)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetSourceFile(JDWP::RefTypeId ref_type_id, std::string* source_file)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetObjectTag(JDWP::ObjectId object_id, uint8_t* tag)
REQUIRES_SHARED(Locks::mutator_lock_);
static size_t GetTagWidth(JDWP::JdwpTag tag);
static JDWP::JdwpError GetArrayLength(JDWP::ObjectId array_id, int32_t* length)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError OutputArray(JDWP::ObjectId array_id, int offset, int count,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError SetArrayElements(JDWP::ObjectId array_id, int offset, int count,
JDWP::Request* request)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError CreateString(const std::string& str, JDWP::ObjectId* new_string_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError CreateObject(JDWP::RefTypeId class_id, JDWP::ObjectId* new_object_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError CreateArrayObject(JDWP::RefTypeId array_class_id, uint32_t length,
JDWP::ObjectId* new_array_id)
REQUIRES_SHARED(Locks::mutator_lock_);
//
// Event filtering.
//
static bool MatchThread(JDWP::ObjectId expected_thread_id, Thread* event_thread)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool MatchLocation(const JDWP::JdwpLocation& expected_location,
const JDWP::EventLocation& event_location)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool MatchType(ObjPtr<mirror::Class> event_class, JDWP::RefTypeId class_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool MatchField(JDWP::RefTypeId expected_type_id, JDWP::FieldId expected_field_id,
ArtField* event_field)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool MatchInstance(JDWP::ObjectId expected_instance_id, mirror::Object* event_instance)
REQUIRES_SHARED(Locks::mutator_lock_);
//
// Monitors.
//
static JDWP::JdwpError GetMonitorInfo(JDWP::ObjectId object_id, JDWP::ExpandBuf* reply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetOwnedMonitors(JDWP::ObjectId thread_id,
std::vector<JDWP::ObjectId>* monitors,
std::vector<uint32_t>* stack_depths)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetContendedMonitor(JDWP::ObjectId thread_id,
JDWP::ObjectId* contended_monitor)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
//
// Heap.
//
static JDWP::JdwpError GetInstanceCounts(const std::vector<JDWP::RefTypeId>& class_ids,
std::vector<uint64_t>* counts)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetInstances(JDWP::RefTypeId class_id, int32_t max_count,
std::vector<JDWP::ObjectId>* instances)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetReferringObjects(JDWP::ObjectId object_id, int32_t max_count,
std::vector<JDWP::ObjectId>* referring_objects)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError DisableCollection(JDWP::ObjectId object_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError EnableCollection(JDWP::ObjectId object_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError IsCollected(JDWP::ObjectId object_id, bool* is_collected)
REQUIRES_SHARED(Locks::mutator_lock_);
static void DisposeObject(JDWP::ObjectId object_id, uint32_t reference_count)
REQUIRES_SHARED(Locks::mutator_lock_);
//
// Methods and fields.
//
static std::string GetMethodName(JDWP::MethodId method_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool IsMethodObsolete(JDWP::MethodId method_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError OutputDeclaredFields(JDWP::RefTypeId ref_type_id, bool with_generic,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError OutputDeclaredMethods(JDWP::RefTypeId ref_type_id, bool with_generic,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError OutputDeclaredInterfaces(JDWP::RefTypeId ref_type_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static void OutputLineTable(JDWP::RefTypeId ref_type_id, JDWP::MethodId method_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static void OutputVariableTable(JDWP::RefTypeId ref_type_id, JDWP::MethodId id, bool with_generic,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static void OutputMethodReturnValue(JDWP::MethodId method_id, const JValue* return_value,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static void OutputFieldValue(JDWP::FieldId field_id, const JValue* field_value,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetBytecodes(JDWP::RefTypeId class_id, JDWP::MethodId method_id,
std::vector<uint8_t>* bytecodes)
REQUIRES_SHARED(Locks::mutator_lock_);
static std::string GetFieldName(JDWP::FieldId field_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpTag GetFieldBasicTag(JDWP::FieldId field_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpTag GetStaticFieldBasicTag(JDWP::FieldId field_id)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError SetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id,
uint64_t value, int width)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetStaticFieldValue(JDWP::RefTypeId ref_type_id, JDWP::FieldId field_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError SetStaticFieldValue(JDWP::FieldId field_id, uint64_t value, int width)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError StringToUtf8(JDWP::ObjectId string_id, std::string* str)
REQUIRES_SHARED(Locks::mutator_lock_);
static void OutputJValue(JDWP::JdwpTag tag, const JValue* return_value, JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
/*
* Thread, ThreadGroup, Frame
*/
static JDWP::JdwpError GetThreadName(JDWP::ObjectId thread_id, std::string* name)
REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Locks::thread_list_lock_);
static JDWP::JdwpError GetThreadGroup(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Locks::thread_list_lock_);
static JDWP::JdwpError GetThreadGroupName(JDWP::ObjectId thread_group_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetThreadGroupParent(JDWP::ObjectId thread_group_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetThreadGroupChildren(JDWP::ObjectId thread_group_id,
JDWP::ExpandBuf* pReply)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::ObjectId GetSystemThreadGroupId()
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpThreadStatus ToJdwpThreadStatus(ThreadState state);
static JDWP::JdwpError GetThreadStatus(JDWP::ObjectId thread_id,
JDWP::JdwpThreadStatus* pThreadStatus,
JDWP::JdwpSuspendStatus* pSuspendStatus)
REQUIRES(!Locks::thread_list_lock_);
static JDWP::JdwpError GetThreadDebugSuspendCount(JDWP::ObjectId thread_id,
JDWP::ExpandBuf* pReply)
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
// static void WaitForSuspend(JDWP::ObjectId thread_id);
// Fills 'thread_ids' with the threads in the given thread group. If thread_group_id == 0,
// returns all threads.
static void GetThreads(mirror::Object* thread_group, std::vector<JDWP::ObjectId>* thread_ids)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetThreadFrameCount(JDWP::ObjectId thread_id, size_t* result)
REQUIRES(!Locks::thread_list_lock_);
static JDWP::JdwpError GetThreadFrames(JDWP::ObjectId thread_id, size_t start_frame,
size_t frame_count, JDWP::ExpandBuf* buf)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::ObjectId GetThreadSelfId() REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::ObjectId GetThreadId(Thread* thread) REQUIRES_SHARED(Locks::mutator_lock_);
static void SuspendVM()
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
static void ResumeVM()
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
static JDWP::JdwpError SuspendThread(JDWP::ObjectId thread_id, bool request_suspension = true)
REQUIRES(!Locks::mutator_lock_, !Locks::thread_list_lock_,
!Locks::thread_suspend_count_lock_);
static void ResumeThread(JDWP::ObjectId thread_id)
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
static void SuspendSelf();
static JDWP::JdwpError GetThisObject(JDWP::ObjectId thread_id, JDWP::FrameId frame_id,
JDWP::ObjectId* result)
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetLocalValues(JDWP::Request* request, JDWP::ExpandBuf* pReply)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError SetLocalValues(JDWP::Request* request)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError Interrupt(JDWP::ObjectId thread_id)
REQUIRES(!Locks::thread_list_lock_);
/*
* Debugger notification
*/
enum EventFlag {
kBreakpoint = 0x01,
kSingleStep = 0x02,
kMethodEntry = 0x04,
kMethodExit = 0x08,
};
static void PostFieldAccessEvent(ArtMethod* m, int dex_pc, mirror::Object* this_object,
ArtField* f)
REQUIRES_SHARED(Locks::mutator_lock_);
static void PostFieldModificationEvent(ArtMethod* m, int dex_pc,
mirror::Object* this_object, ArtField* f,
const JValue* field_value)
REQUIRES_SHARED(Locks::mutator_lock_);
static void PostException(mirror::Throwable* exception)
REQUIRES_SHARED(Locks::mutator_lock_);
static void UpdateDebugger(Thread* thread, mirror::Object* this_object,
ArtMethod* method, uint32_t new_dex_pc,
int event_flags, const JValue* return_value)
REQUIRES(!Locks::breakpoint_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
// Indicates whether we need deoptimization for debugging.
static bool RequiresDeoptimization();
// Records deoptimization request in the queue.
static void RequestDeoptimization(const DeoptimizationRequest& req)
REQUIRES(!Locks::deoptimization_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
// Manage deoptimization after updating JDWP events list. Suspends all threads, processes each
// request and finally resumes all threads.
static void ManageDeoptimization()
REQUIRES(!Locks::deoptimization_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
// Breakpoints.
static void WatchLocation(const JDWP::JdwpLocation* pLoc, DeoptimizationRequest* req)
REQUIRES(!Locks::breakpoint_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static void UnwatchLocation(const JDWP::JdwpLocation* pLoc, DeoptimizationRequest* req)
REQUIRES(!Locks::breakpoint_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
/*
* Forced interpreter checkers for single-step and continue support.
*/
// Indicates whether we need to force the use of interpreter to invoke a method.
// This allows to single-step or continue into the called method.
static bool IsForcedInterpreterNeededForCalling(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!IsDebuggerActive()) {
return false;
}
return IsForcedInterpreterNeededForCallingImpl(thread, m);
}
// Indicates whether we need to force the use of interpreter entrypoint when calling a
// method through the resolution trampoline. This allows to single-step or continue into
// the called method.
static bool IsForcedInterpreterNeededForResolution(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!IsDebuggerActive()) {
return false;
}
return IsForcedInterpreterNeededForResolutionImpl(thread, m);
}
// Indicates whether we need to force the use of instrumentation entrypoint when calling
// a method through the resolution trampoline. This allows to deoptimize the stack for
// debugging when we returned from the called method.
static bool IsForcedInstrumentationNeededForResolution(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!IsDebuggerActive()) {
return false;
}
return IsForcedInstrumentationNeededForResolutionImpl(thread, m);
}
// Indicates whether we need to force the use of interpreter when returning from the
// interpreter into the runtime. This allows to deoptimize the stack and continue
// execution with interpreter for debugging.
static bool IsForcedInterpreterNeededForUpcall(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!IsDebuggerActive() && !thread->HasDebuggerShadowFrames()) {
return false;
}
return IsForcedInterpreterNeededForUpcallImpl(thread, m);
}
// Indicates whether we need to force the use of interpreter when handling an
// exception. This allows to deoptimize the stack and continue execution with
// the interpreter.
// Note: the interpreter will start by handling the exception when executing
// the deoptimized frames.
static bool IsForcedInterpreterNeededForException(Thread* thread)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!IsDebuggerActive() && !thread->HasDebuggerShadowFrames()) {
return false;
}
return IsForcedInterpreterNeededForExceptionImpl(thread);
}
// Single-stepping.
static JDWP::JdwpError ConfigureStep(JDWP::ObjectId thread_id, JDWP::JdwpStepSize size,
JDWP::JdwpStepDepth depth)
REQUIRES_SHARED(Locks::mutator_lock_);
static void UnconfigureStep(JDWP::ObjectId thread_id)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
/*
* Invoke support
*/
// Called by the JDWP thread to prepare invocation in the event thread (suspended on an event).
// If the information sent by the debugger is incorrect, it will send a reply with the
// appropriate error code. Otherwise, it will attach a DebugInvokeReq object to the event thread
// and resume it (and possibly other threads depending on the invoke options).
// Unlike other commands, the JDWP thread will not send the reply to the debugger (see
// JdwpState::ProcessRequest). The reply will be sent by the event thread itself after method
// invocation completes (see FinishInvokeMethod). This is required to allow the JDWP thread to
// process incoming commands from the debugger while the invocation is still in progress in the
// event thread, especially if it gets suspended by a debug event occurring in another thread.
static JDWP::JdwpError PrepareInvokeMethod(uint32_t request_id, JDWP::ObjectId thread_id,
JDWP::ObjectId object_id, JDWP::RefTypeId class_id,
JDWP::MethodId method_id, uint32_t arg_count,
uint64_t arg_values[], JDWP::JdwpTag* arg_types,
uint32_t options)
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Called by the event thread to execute a method prepared by the JDWP thread in the given
// DebugInvokeReq object. Once the invocation completes, the event thread attaches a reply
// to that DebugInvokeReq object so it can be sent to the debugger only when the event thread
// is ready to suspend (see FinishInvokeMethod).
static void ExecuteMethod(DebugInvokeReq* pReq);
// Called by the event thread to send the reply of the invoke (created in ExecuteMethod)
// before suspending itself. This is to ensure the thread is ready to suspend before the
// debugger receives the reply.
static void FinishInvokeMethod(DebugInvokeReq* pReq);
/*
* DDM support.
*/
static void DdmSendThreadNotification(Thread* t, uint32_t type)
REQUIRES_SHARED(Locks::mutator_lock_);
static void DdmSetThreadNotification(bool enable)
REQUIRES(!Locks::thread_list_lock_);
static bool DdmHandleChunk(
JNIEnv* env,
uint32_t type,
const ArrayRef<const jbyte>& data,
/*out*/uint32_t* out_type,
/*out*/std::vector<uint8_t>* out_data);
static bool DdmHandlePacket(JDWP::Request* request, uint8_t** pReplyBuf, int* pReplyLen);
static void DdmConnected() REQUIRES_SHARED(Locks::mutator_lock_);
static void DdmDisconnected() REQUIRES_SHARED(Locks::mutator_lock_);
// Visit breakpoint roots, used to prevent unloading of methods with breakpoints.
static void VisitRoots(RootVisitor* visitor)
REQUIRES_SHARED(Locks::mutator_lock_);
/*
* Allocation tracking support.
*/
static void SetAllocTrackingEnabled(bool enabled) REQUIRES(!Locks::alloc_tracker_lock_);
static jbyteArray GetRecentAllocations()
REQUIRES(!Locks::alloc_tracker_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static void DumpRecentAllocations() REQUIRES(!Locks::alloc_tracker_lock_);
enum HpifWhen {
HPIF_WHEN_NEVER = 0,
HPIF_WHEN_NOW = 1,
HPIF_WHEN_NEXT_GC = 2,
HPIF_WHEN_EVERY_GC = 3
};
static int DdmHandleHpifChunk(HpifWhen when)
REQUIRES_SHARED(Locks::mutator_lock_);
enum HpsgWhen {
HPSG_WHEN_NEVER = 0,
HPSG_WHEN_EVERY_GC = 1,
};
enum HpsgWhat {
HPSG_WHAT_MERGED_OBJECTS = 0,
HPSG_WHAT_DISTINCT_OBJECTS = 1,
};
static bool DdmHandleHpsgNhsgChunk(HpsgWhen when, HpsgWhat what, bool native);
static void DdmSendHeapInfo(HpifWhen reason)
REQUIRES_SHARED(Locks::mutator_lock_);
static void DdmSendHeapSegments(bool native)
REQUIRES_SHARED(Locks::mutator_lock_);
static ObjectRegistry* GetObjectRegistry() {
return gRegistry;
}
static JDWP::JdwpTag TagFromObject(const ScopedObjectAccessUnchecked& soa, mirror::Object* o)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpTypeTag GetTypeTag(ObjPtr<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::FieldId ToFieldId(const ArtField* f)
REQUIRES_SHARED(Locks::mutator_lock_);
static void SetJdwpLocation(JDWP::JdwpLocation* location, ArtMethod* m, uint32_t dex_pc)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
static JDWP::JdwpState* GetJdwpState();
static uint32_t GetInstrumentationEvents() REQUIRES_SHARED(Locks::mutator_lock_) {
return instrumentation_events_;
}
static ThreadLifecycleCallback* GetThreadLifecycleCallback() {
return &thread_lifecycle_callback_;
}
static ClassLoadCallback* GetClassLoadCallback() {
return &class_load_callback_;
}
private:
static void ExecuteMethodWithoutPendingException(ScopedObjectAccess& soa, DebugInvokeReq* pReq)
REQUIRES_SHARED(Locks::mutator_lock_);
static void BuildInvokeReply(JDWP::ExpandBuf* pReply, uint32_t request_id,
JDWP::JdwpTag result_tag, uint64_t result_value,
JDWP::ObjectId exception)
REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError GetLocalValue(const StackVisitor& visitor,
ScopedObjectAccessUnchecked& soa, int slot,
JDWP::JdwpTag tag, uint8_t* buf, size_t width)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static JDWP::JdwpError SetLocalValue(Thread* thread, StackVisitor& visitor, int slot,
JDWP::JdwpTag tag, uint64_t value, size_t width)
REQUIRES(!Locks::thread_list_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static void DdmBroadcast(bool connect) REQUIRES_SHARED(Locks::mutator_lock_);
static void PostThreadStart(Thread* t)
REQUIRES_SHARED(Locks::mutator_lock_);
static void PostThreadDeath(Thread* t)
REQUIRES_SHARED(Locks::mutator_lock_);
static void PostThreadStartOrStop(Thread*, uint32_t)
REQUIRES_SHARED(Locks::mutator_lock_);
static void PostClassPrepare(mirror::Class* c)
REQUIRES_SHARED(Locks::mutator_lock_);
static void PostLocationEvent(ArtMethod* method, int pcOffset,
mirror::Object* thisPtr, int eventFlags,
const JValue* return_value)
REQUIRES_SHARED(Locks::mutator_lock_);
static void ProcessDeoptimizationRequest(const DeoptimizationRequest& request)
REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_);
static void RequestDeoptimizationLocked(const DeoptimizationRequest& req)
REQUIRES(Locks::deoptimization_lock_) REQUIRES_SHARED(Locks::mutator_lock_);
static bool IsForcedInterpreterNeededForCallingImpl(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool IsForcedInterpreterNeededForResolutionImpl(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool IsForcedInstrumentationNeededForResolutionImpl(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool IsForcedInterpreterNeededForUpcallImpl(Thread* thread, ArtMethod* m)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool IsForcedInterpreterNeededForExceptionImpl(Thread* thread)
REQUIRES_SHARED(Locks::mutator_lock_);
// Indicates whether the debugger is making requests.
static bool gDebuggerActive;
static DebuggerActiveMethodInspectionCallback gDebugActiveCallback;
static DebuggerDdmCallback gDebugDdmCallback;
static InternalDebuggerControlCallback gDebuggerControlCallback;
// Indicates whether we should drop the JDWP connection because the runtime stops or the
// debugger called VirtualMachine.Dispose.
static bool gDisposed;
// The registry mapping objects to JDWP ids.
static ObjectRegistry* gRegistry;
// Deoptimization requests to be processed each time the event list is updated. This is used when
// registering and unregistering events so we do not deoptimize while holding the event list
// lock.
// TODO rename to instrumentation_requests.
static std::vector<DeoptimizationRequest> deoptimization_requests_ GUARDED_BY(Locks::deoptimization_lock_);
// Count the number of events requiring full deoptimization. When the counter is > 0, everything
// is deoptimized, otherwise everything is undeoptimized.
// Note: we fully deoptimize on the first event only (when the counter is set to 1). We fully
// undeoptimize when the last event is unregistered (when the counter is set to 0).
static size_t full_deoptimization_event_count_ GUARDED_BY(Locks::deoptimization_lock_);
static size_t* GetReferenceCounterForEvent(uint32_t instrumentation_event);
// Instrumentation event reference counters.
// TODO we could use an array instead of having all these dedicated counters. Instrumentation
// events are bits of a mask so we could convert them to array index.
static size_t dex_pc_change_event_ref_count_ GUARDED_BY(Locks::deoptimization_lock_);
static size_t method_enter_event_ref_count_ GUARDED_BY(Locks::deoptimization_lock_);
static size_t method_exit_event_ref_count_ GUARDED_BY(Locks::deoptimization_lock_);
static size_t field_read_event_ref_count_ GUARDED_BY(Locks::deoptimization_lock_);
static size_t field_write_event_ref_count_ GUARDED_BY(Locks::deoptimization_lock_);
static size_t exception_catch_event_ref_count_ GUARDED_BY(Locks::deoptimization_lock_);
static uint32_t instrumentation_events_ GUARDED_BY(Locks::mutator_lock_);
class DbgThreadLifecycleCallback : public ThreadLifecycleCallback {
public:
void ThreadStart(Thread* self) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
void ThreadDeath(Thread* self) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
};
class DbgClassLoadCallback : public ClassLoadCallback {
public:
void ClassLoad(Handle<mirror::Class> klass) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
void ClassPrepare(Handle<mirror::Class> temp_klass,
Handle<mirror::Class> klass) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_);
};
static DbgThreadLifecycleCallback thread_lifecycle_callback_;
static DbgClassLoadCallback class_load_callback_;
DISALLOW_COPY_AND_ASSIGN(Dbg);
};
#define CHUNK_TYPE(_name) \
static_cast<uint32_t>((_name)[0] << 24 | (_name)[1] << 16 | (_name)[2] << 8 | (_name)[3])
} // namespace art
#endif // ART_RUNTIME_DEBUGGER_H_