Eclipse通过JDWP调试Dalvik

Eclipse发送各种JDWP命令包,DalvikVM收到命令包(command package),响应并发送回复包(reply package),通过缓冲区交换数据

JDWP:调试协议

(一)Android Dalvik实现的JDWP响应:

static const JdwpHandlerMap gHandlerMap[] = {
    /* VirtualMachine command set (1) */
    { 1,    1, handleVM_Version,       "VirtualMachine.Version" },
    { 1,    2, handleVM_ClassesBySignature,
                                        "VirtualMachine.ClassesBySignature" },
    //1,    3, VirtualMachine.AllClasses
    { 1,    4, handleVM_AllThreads,    "VirtualMachine.AllThreads" },
    { 1,    5, handleVM_TopLevelThreadGroups,
                                        "VirtualMachine.TopLevelThreadGroups" },
    { 1,    6, handleVM_Dispose,       "VirtualMachine.Dispose" },
    { 1,    7, handleVM_IDSizes,       "VirtualMachine.IDSizes" },
    { 1,    8, handleVM_Suspend,       "VirtualMachine.Suspend" },
    { 1,    9, handleVM_Resume,        "VirtualMachine.Resume" },
    { 1,    10, handleVM_Exit,          "VirtualMachine.Exit" },
    { 1,    11, handleVM_CreateString, "VirtualMachine.CreateString" },
    { 1,    12, handleVM_Capabilities, "VirtualMachine.Capabilities" },
    { 1,    13, handleVM_ClassPaths,    "VirtualMachine.ClassPaths" },
    { 1,    14, HandleVM_DisposeObjects, "VirtualMachine.DisposeObjects" },
    //1,    15, HoldEvents
    //1,    16, ReleaseEvents
    { 1,    17, handleVM_CapabilitiesNew,
                                        "VirtualMachine.CapabilitiesNew" },
    //1,    18, RedefineClasses
    //1,    19, SetDefaultStratum
    { 1,    20, handleVM_AllClassesWithGeneric,
                                        "VirtualMachine.AllClassesWithGeneric"},
    //1,    21, InstanceCounts

/* ReferenceType command set (2) */
    { 2,    1, handleRT_Signature,     "ReferenceType.Signature" },
    { 2,    2, handleRT_ClassLoader,   "ReferenceType.ClassLoader" },
    { 2,    3, handleRT_Modifiers,     "ReferenceType.Modifiers" },
    //2,    4, Fields
    //2,    5, Methods
    { 2,    6, handleRT_GetValues,     "ReferenceType.GetValues" },
    { 2,    7, handleRT_SourceFile,    "ReferenceType.SourceFile" },
    //2,    8, NestedTypes
    { 2,    9, handleRT_Status,        "ReferenceType.Status" },
    { 2,    10, handleRT_Interfaces,    "ReferenceType.Interfaces" },
    //2,    11, ClassObject
    { 2,    12, handleRT_SourceDebugExtension,
                                        "ReferenceType.SourceDebugExtension" },
    { 2,    13, handleRT_SignatureWithGeneric,
                                        "ReferenceType.SignatureWithGeneric" },
    { 2,    14, handleRT_FieldsWithGeneric,
                                        "ReferenceType.FieldsWithGeneric" },
    { 2,    15, handleRT_MethodsWithGeneric,
                                        "ReferenceType.MethodsWithGeneric" },
    //2,    16, Instances
    //2,    17, ClassFileVersion
    //2,    18, ConstantPool

/* ClassType command set (3) */
    { 3,    1, handleCT_Superclass,    "ClassType.Superclass" },
    { 3,    2, handleCT_SetValues,     "ClassType.SetValues" },
    { 3,    3, handleCT_InvokeMethod, "ClassType.InvokeMethod" },
    //3,    4, NewInstance

/* ArrayType command set (4) */
//4, 1, NewInstance

/* InterfaceType command set (5) */

/* Method command set (6) */
    { 6,    1, handleM_LineTable,      "Method.LineTable" },
    //6,    2, VariableTable
    //6,    3, Bytecodes
    //6,    4, IsObsolete
    { 6,    5, handleM_VariableTableWithGeneric,
                                        "Method.VariableTableWithGeneric" },

/* Field command set (8) */

/* ObjectReference command set (9) */
    { 9,    1, handleOR_ReferenceType, "ObjectReference.ReferenceType" },
    { 9,    2, handleOR_GetValues,     "ObjectReference.GetValues" },
    { 9,    3, handleOR_SetValues,     "ObjectReference.SetValues" },
    //9,    4, (not defined)
    //9,    5, MonitorInfo
    { 9,    6, handleOR_InvokeMethod, "ObjectReference.InvokeMethod" },
    { 9,    7, handleOR_DisableCollection,
                                        "ObjectReference.DisableCollection" },
    { 9,    8, handleOR_EnableCollection,
                                        "ObjectReference.EnableCollection" },
    { 9,    9, handleOR_IsCollected,   "ObjectReference.IsCollected" },
    //9,    10, ReferringObjects

/* StringReference command set (10) */
{ 10, 1, handleSR_Value, "StringReference.Value" },

/* ThreadReference command set (11) */
    { 11,   1, handleTR_Name,          "ThreadReference.Name" },
    { 11,   2, handleTR_Suspend,       "ThreadReference.Suspend" },
    { 11,   3, handleTR_Resume,        "ThreadReference.Resume" },
    { 11,   4, handleTR_Status,        "ThreadReference.Status" },
    { 11,   5, handleTR_ThreadGroup,   "ThreadReference.ThreadGroup" },
    { 11,   6, handleTR_Frames,        "ThreadReference.Frames" },
    { 11,   7, handleTR_FrameCount,    "ThreadReference.FrameCount" },
    //11,   8, OwnedMonitors
    { 11,   9, handleTR_CurrentContendedMonitor,
                                    "ThreadReference.CurrentContendedMonitor" },
    //11,   10, Stop
    //11,   11, Interrupt
    { 11,   12, handleTR_SuspendCount, "ThreadReference.SuspendCount" },
    //11,   13, OwnedMonitorsStackDepthInfo
    //11,   14, ForceEarlyReturn

/* ThreadGroupReference command set (12) */
    { 12,   1, handleTGR_Name,         "ThreadGroupReference.Name" },
    { 12,   2, handleTGR_Parent,       "ThreadGroupReference.Parent" },
    { 12,   3, handleTGR_Children,     "ThreadGroupReference.Children" },

/* ArrayReference command set (13) */
    { 13,   1, handleAR_Length,        "ArrayReference.Length" },
    { 13,   2, handleAR_GetValues,     "ArrayReference.GetValues" },
    { 13,   3, handleAR_SetValues,     "ArrayReference.SetValues" },

/* ClassLoaderReference command set (14) */
{ 14, 1, handleCLR_VisibleClasses,
"ClassLoaderReference.VisibleClasses" },

/* EventRequest command set (15) */
    { 15,   1, handleER_Set,           "EventRequest.Set" },
    { 15,   2, handleER_Clear,         "EventRequest.Clear" },
    //15,   3, ClearAllBreakpoints

/* StackFrame command set (16) */
    { 16,   1, handleSF_GetValues,     "StackFrame.GetValues" },
    { 16,   2, handleSF_SetValues,     "StackFrame.SetValues" },
    { 16,   3, handleSF_ThisObject,    "StackFrame.ThisObject" },
    //16,   4, PopFrames

/* ClassObjectReference command set (17) */
{ 17, 1, handleCOR_ReflectedType,"ClassObjectReference.ReflectedType" },

/* Event command set (64) */
//64, 100, Composite <-- sent from VM to debugger, never received by VM

{ 199, 1, handleDDM_Chunk, "DDM.Chunk" },
};

(二)具体的请求和响应:

Eclipse进入debug状态

(1)发送JDWP的ReferenceType.FieldsWithGeneric命令包, dalvik响应调用handleRT_FieldsWithGeneric->dvmDbgOutputAllFields将某个类的所有域信息放入缓冲,Eclipse读取以显示

(2)发送JDWP的ObjectReference.GetValues命令包,dalvik响应调用handleOR_GetValues->dvmDbgGetFieldValue将域值放入缓冲区

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