lldb/source/Commands/CommandObjectThread.cpp

//===-- CommandObjectThread.cpp ---------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/lldb-python.h"

#include "CommandObjectThread.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/lldb-private.h"
#include "lldb/Core/State.h"
#include "lldb/Core/SourceManager.h"
#include "lldb/Host/Host.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/Options.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/LineTable.h"
#include "lldb/Symbol/LineEntry.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/SystemRuntime.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/ThreadPlanStepInstruction.h"
#include "lldb/Target/ThreadPlanStepOut.h"
#include "lldb/Target/ThreadPlanStepRange.h"
#include "lldb/Target/ThreadPlanStepInRange.h"


using namespace lldb;
using namespace lldb_private;


//-------------------------------------------------------------------------
// CommandObjectThreadBacktrace
//-------------------------------------------------------------------------

class CommandObjectThreadBacktrace : public CommandObjectParsed
{
public:

    class CommandOptions : public Options
    {
    public:

        CommandOptions (CommandInterpreter &interpreter) :
            Options(interpreter)
        {
            // Keep default values of all options in one place: OptionParsingStarting ()
            OptionParsingStarting ();
        }

        virtual
        ~CommandOptions ()
        {
        }

        virtual Error
        SetOptionValue (uint32_t option_idx, const char *option_arg)
        {
            Error error;
            const int short_option = m_getopt_table[option_idx].val;

            switch (short_option)
            {
                case 'c':
                {
                    bool success;
                    int32_t input_count =  Args::StringToSInt32 (option_arg, -1, 0, &success);
                    if (!success)
                        error.SetErrorStringWithFormat("invalid integer value for option '%c'", short_option);
                    if (input_count < -1)
                        m_count = UINT32_MAX;
                    else
                        m_count = input_count;
                }
                break;
                case 's':
                {
                    bool success;
                    m_start =  Args::StringToUInt32 (option_arg, 0, 0, &success);
                    if (!success)
                        error.SetErrorStringWithFormat("invalid integer value for option '%c'", short_option);
                }
                case 'e':
                {
                    bool success;
                    m_extended_backtrace =  Args::StringToBoolean (option_arg, false, &success);
                    if (!success)
                        error.SetErrorStringWithFormat("invalid boolean value for option '%c'", short_option);
                }
                break;
                default:
                    error.SetErrorStringWithFormat("invalid short option character '%c'", short_option);
                    break;

            }
            return error;
        }

        void
        OptionParsingStarting ()
        {
            m_count = UINT32_MAX;
            m_start = 0;
            m_extended_backtrace = false;
        }

        const OptionDefinition*
        GetDefinitions ()
        {
            return g_option_table;
        }

        // Options table: Required for subclasses of Options.

        static OptionDefinition g_option_table[];

        // Instance variables to hold the values for command options.
        uint32_t m_count;
        uint32_t m_start;
        bool     m_extended_backtrace;
    };

    CommandObjectThreadBacktrace (CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter,
                             "thread backtrace",
                             "Show the stack for one or more threads.  If no threads are specified, show the currently selected thread.  Use the thread-index \"all\" to see all threads.",
                             NULL,
                             eFlagRequiresProcess       |
                             eFlagRequiresThread        |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused   ),
        m_options(interpreter)
    {
        CommandArgumentEntry arg;
        CommandArgumentData thread_idx_arg;
        
        // Define the first (and only) variant of this arg.
        thread_idx_arg.arg_type = eArgTypeThreadIndex;
        thread_idx_arg.arg_repetition = eArgRepeatStar;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (thread_idx_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }

    ~CommandObjectThreadBacktrace()
    {
    }

    virtual Options *
    GetOptions ()
    {
        return &m_options;
    }

protected:
    void
    DoExtendedBacktrace (Thread *thread, CommandReturnObject &result)
    {
        SystemRuntime *runtime = thread->GetProcess()->GetSystemRuntime();
        if (runtime)
        {
            Stream &strm = result.GetOutputStream();
            const std::vector<ConstString> &types = runtime->GetExtendedBacktraceTypes();
            for (auto type : types)
            {
                ThreadSP ext_thread_sp = runtime->GetExtendedBacktraceThread (thread->shared_from_this(), type);
                if (ext_thread_sp && ext_thread_sp->IsValid ())
                {
                    const uint32_t num_frames_with_source = 0;
                    if (ext_thread_sp->GetStatus (strm, 
                        m_options.m_start, 
                        m_options.m_count, 
                        num_frames_with_source))
                    {
                        DoExtendedBacktrace (ext_thread_sp.get(), result);
                    }
                }
            }
        }
    }

    virtual bool
    DoExecute (Args& command, CommandReturnObject &result)
    {        
        result.SetStatus (eReturnStatusSuccessFinishResult);
        Stream &strm = result.GetOutputStream();

        // Don't show source context when doing backtraces.
        const uint32_t num_frames_with_source = 0;
        if (command.GetArgumentCount() == 0)
        {
            Thread *thread = m_exe_ctx.GetThreadPtr();
            // Thread::GetStatus() returns the number of frames shown.
            if (thread->GetStatus (strm,
                                   m_options.m_start,
                                   m_options.m_count,
                                   num_frames_with_source))
            {
                result.SetStatus (eReturnStatusSuccessFinishResult);
                if (m_options.m_extended_backtrace)
                {
                    DoExtendedBacktrace (thread, result);
                }
            }
        }
        else if (command.GetArgumentCount() == 1 && ::strcmp (command.GetArgumentAtIndex(0), "all") == 0)
        {
            Process *process = m_exe_ctx.GetProcessPtr();
            uint32_t idx = 0;
            for (ThreadSP thread_sp : process->Threads())
            {
                if (idx != 0)
                    result.AppendMessage("");

                if (!thread_sp->GetStatus (strm,
                                           m_options.m_start,
                                           m_options.m_count,
                                           num_frames_with_source))
                {
                    result.AppendErrorWithFormat ("error displaying backtrace for thread: \"0x%4.4x\"\n", idx);
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                if (m_options.m_extended_backtrace)
                {
                    DoExtendedBacktrace (thread_sp.get(), result);
                }
                
                ++idx;
            }
        }
        else
        {
            const size_t num_args = command.GetArgumentCount();
            Process *process = m_exe_ctx.GetProcessPtr();
            Mutex::Locker locker (process->GetThreadList().GetMutex());
            std::vector<ThreadSP> thread_sps;

            for (size_t i = 0; i < num_args; i++)
            {
                bool success;
                
                uint32_t thread_idx = Args::StringToUInt32(command.GetArgumentAtIndex(i), 0, 0, &success);
                if (!success)
                {
                    result.AppendErrorWithFormat ("invalid thread specification: \"%s\"\n", command.GetArgumentAtIndex(i));
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                
                thread_sps.push_back(process->GetThreadList().FindThreadByIndexID(thread_idx));
                
                if (!thread_sps[i])
                {
                    result.AppendErrorWithFormat ("no thread with index: \"%s\"\n", command.GetArgumentAtIndex(i));
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                
            }
            
            for (uint32_t i = 0; i < num_args; i++)
            {
                if (!thread_sps[i]->GetStatus (strm,
                                               m_options.m_start,
                                               m_options.m_count,
                                               num_frames_with_source))
                {
                    result.AppendErrorWithFormat ("error displaying backtrace for thread: \"%s\"\n", command.GetArgumentAtIndex(i));
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                if (m_options.m_extended_backtrace)
                {
                    DoExtendedBacktrace (thread_sps[i].get(), result);
                }
                
                if (i < num_args - 1)
                    result.AppendMessage("");
            }
        }
        return result.Succeeded();
    }

    CommandOptions m_options;
};

OptionDefinition
CommandObjectThreadBacktrace::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_1, false, "count", 'c', OptionParser::eRequiredArgument, NULL, NULL, 0, eArgTypeCount, "How many frames to display (-1 for all)"},
{ LLDB_OPT_SET_1, false, "start", 's', OptionParser::eRequiredArgument, NULL, NULL, 0, eArgTypeFrameIndex, "Frame in which to start the backtrace"},
{ LLDB_OPT_SET_1, false, "extended", 'e', OptionParser::eRequiredArgument, NULL, NULL, 0, eArgTypeBoolean, "Show the extended backtrace, if available"},
{ 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};

enum StepScope
{
    eStepScopeSource,
    eStepScopeInstruction
};

class CommandObjectThreadStepWithTypeAndScope : public CommandObjectParsed
{
public:

    class CommandOptions : public Options
    {
    public:

        CommandOptions (CommandInterpreter &interpreter) :
            Options (interpreter)
        {
            // Keep default values of all options in one place: OptionParsingStarting ()
            OptionParsingStarting ();
        }

        virtual
        ~CommandOptions ()
        {
        }

        virtual Error
        SetOptionValue (uint32_t option_idx, const char *option_arg)
        {
            Error error;
            const int short_option = m_getopt_table[option_idx].val;

            switch (short_option)
            {
            case 'a':
                {
                    bool success;
                    bool avoid_no_debug =  Args::StringToBoolean (option_arg, true, &success);
                    if (!success)
                        error.SetErrorStringWithFormat("invalid boolean value for option '%c'", short_option);
                    else
                    {
                        m_step_in_avoid_no_debug = avoid_no_debug ? eLazyBoolYes : eLazyBoolNo;
                    }
                }
                break;
            
            case 'A':
                {
                    bool success;
                    bool avoid_no_debug =  Args::StringToBoolean (option_arg, true, &success);
                    if (!success)
                        error.SetErrorStringWithFormat("invalid boolean value for option '%c'", short_option);
                    else
                    {
                        m_step_out_avoid_no_debug = avoid_no_debug ? eLazyBoolYes : eLazyBoolNo;
                    }
                }
                break;
            
            case 'c':
                {
                    m_step_count = Args::StringToUInt32(option_arg, UINT32_MAX, 0);
                    if (m_step_count == UINT32_MAX)
                       error.SetErrorStringWithFormat ("invalid ignore count '%s'", option_arg);
                    break;
                }
                break;
            case 'm':
                {
                    OptionEnumValueElement *enum_values = g_option_table[option_idx].enum_values; 
                    m_run_mode = (lldb::RunMode) Args::StringToOptionEnum(option_arg, enum_values, eOnlyDuringStepping, error);
                }
                break;
            
            case 'r':
                {
                    m_avoid_regexp.clear();
                    m_avoid_regexp.assign(option_arg);
                }
                break;

            case 't':
                {
                    m_step_in_target.clear();
                    m_step_in_target.assign(option_arg);

                }
                break;
            default:
                error.SetErrorStringWithFormat("invalid short option character '%c'", short_option);
                break;

            }
            return error;
        }

        void
        OptionParsingStarting ()
        {
            m_step_in_avoid_no_debug = eLazyBoolCalculate;
            m_step_out_avoid_no_debug = eLazyBoolCalculate;
            m_run_mode = eOnlyDuringStepping;
            m_avoid_regexp.clear();
            m_step_in_target.clear();
            m_step_count = 1;
        }

        const OptionDefinition*
        GetDefinitions ()
        {
            return g_option_table;
        }

        // Options table: Required for subclasses of Options.

        static OptionDefinition g_option_table[];

        // Instance variables to hold the values for command options.
        LazyBool m_step_in_avoid_no_debug;
        LazyBool m_step_out_avoid_no_debug;
        RunMode m_run_mode;
        std::string m_avoid_regexp;
        std::string m_step_in_target;
        int32_t m_step_count;
    };

    CommandObjectThreadStepWithTypeAndScope (CommandInterpreter &interpreter,
                                             const char *name,
                                             const char *help,
                                             const char *syntax,
                                             StepType step_type,
                                             StepScope step_scope) :
        CommandObjectParsed (interpreter, name, help, syntax,
                             eFlagRequiresProcess       |
                             eFlagRequiresThread        |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused   ),
        m_step_type (step_type),
        m_step_scope (step_scope),
        m_options (interpreter)
    {
        CommandArgumentEntry arg;
        CommandArgumentData thread_id_arg;
        
        // Define the first (and only) variant of this arg.
        thread_id_arg.arg_type = eArgTypeThreadID;
        thread_id_arg.arg_repetition = eArgRepeatOptional;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (thread_id_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }

    virtual
    ~CommandObjectThreadStepWithTypeAndScope ()
    {
    }

    virtual
    Options *
    GetOptions ()
    {
        return &m_options;
    }

protected:
    virtual bool
    DoExecute (Args& command, CommandReturnObject &result)
    {
        Process *process = m_exe_ctx.GetProcessPtr();
        bool synchronous_execution = m_interpreter.GetSynchronous();

        const uint32_t num_threads = process->GetThreadList().GetSize();
        Thread *thread = NULL;

        if (command.GetArgumentCount() == 0)
        {
            thread = process->GetThreadList().GetSelectedThread().get();
            if (thread == NULL)
            {
                result.AppendError ("no selected thread in process");
                result.SetStatus (eReturnStatusFailed);
                return false;
            }
        }
        else
        {
            const char *thread_idx_cstr = command.GetArgumentAtIndex(0);
            uint32_t step_thread_idx = Args::StringToUInt32 (thread_idx_cstr, LLDB_INVALID_INDEX32);
            if (step_thread_idx == LLDB_INVALID_INDEX32)
            {
                result.AppendErrorWithFormat ("invalid thread index '%s'.\n", thread_idx_cstr);
                result.SetStatus (eReturnStatusFailed);
                return false;
            }
            thread = process->GetThreadList().FindThreadByIndexID(step_thread_idx).get();
            if (thread == NULL)
            {
                result.AppendErrorWithFormat ("Thread index %u is out of range (valid values are 0 - %u).\n", 
                                              step_thread_idx, num_threads);
                result.SetStatus (eReturnStatusFailed);
                return false;
            }
        }

        const bool abort_other_plans = false;
        const lldb::RunMode stop_other_threads = m_options.m_run_mode;
        
        // This is a bit unfortunate, but not all the commands in this command object support
        // only while stepping, so I use the bool for them.
        bool bool_stop_other_threads;
        if (m_options.m_run_mode == eAllThreads)
            bool_stop_other_threads = false;
        else if (m_options.m_run_mode == eOnlyDuringStepping)
        {
            if (m_step_type == eStepTypeOut)
                bool_stop_other_threads = false;
            else
                bool_stop_other_threads = true;
        }
        else
            bool_stop_other_threads = true;

        ThreadPlanSP new_plan_sp;
        
        if (m_step_type == eStepTypeInto)
        {
            StackFrame *frame = thread->GetStackFrameAtIndex(0).get();

            if (frame->HasDebugInformation ())
            {
                new_plan_sp = thread->QueueThreadPlanForStepInRange (abort_other_plans,
                                                                frame->GetSymbolContext(eSymbolContextEverything).line_entry.range, 
                                                                frame->GetSymbolContext(eSymbolContextEverything),
                                                                m_options.m_step_in_target.c_str(),
                                                                stop_other_threads,
                                                                m_options.m_step_in_avoid_no_debug,
                                                                m_options.m_step_out_avoid_no_debug);
                
                if (new_plan_sp && !m_options.m_avoid_regexp.empty())
                {
                    ThreadPlanStepInRange *step_in_range_plan = static_cast<ThreadPlanStepInRange *> (new_plan_sp.get());
                    step_in_range_plan->SetAvoidRegexp(m_options.m_avoid_regexp.c_str());
                }
            }
            else
                new_plan_sp = thread->QueueThreadPlanForStepSingleInstruction (false, abort_other_plans, bool_stop_other_threads);
                
        }
        else if (m_step_type == eStepTypeOver)
        {
            StackFrame *frame = thread->GetStackFrameAtIndex(0).get();

            if (frame->HasDebugInformation())
                new_plan_sp = thread->QueueThreadPlanForStepOverRange (abort_other_plans,
                                                                    frame->GetSymbolContext(eSymbolContextEverything).line_entry.range, 
                                                                    frame->GetSymbolContext(eSymbolContextEverything), 
                                                                    stop_other_threads,
                                                                    m_options.m_step_out_avoid_no_debug);
            else
                new_plan_sp = thread->QueueThreadPlanForStepSingleInstruction (true,
                                                                            abort_other_plans, 
                                                                            bool_stop_other_threads);

        }
        else if (m_step_type == eStepTypeTrace)
        {
            new_plan_sp = thread->QueueThreadPlanForStepSingleInstruction (false, abort_other_plans, bool_stop_other_threads);
        }
        else if (m_step_type == eStepTypeTraceOver)
        {
            new_plan_sp = thread->QueueThreadPlanForStepSingleInstruction (true, abort_other_plans, bool_stop_other_threads);
        }
        else if (m_step_type == eStepTypeOut)
        {
            new_plan_sp = thread->QueueThreadPlanForStepOut (abort_other_plans,
                                                          NULL, 
                                                          false, 
                                                          bool_stop_other_threads, 
                                                          eVoteYes, 
                                                          eVoteNoOpinion, 
                                                          thread->GetSelectedFrameIndex(),
                                                          m_options.m_step_out_avoid_no_debug);
        }
        else
        {
            result.AppendError ("step type is not supported");
            result.SetStatus (eReturnStatusFailed);
            return false;
        }
        
        // If we got a new plan, then set it to be a master plan (User level Plans should be master plans
        // so that they can be interruptible).  Then resume the process.
        
        if (new_plan_sp)
        {
            new_plan_sp->SetIsMasterPlan (true);
            new_plan_sp->SetOkayToDiscard (false);
            
            if (m_options.m_step_count > 1)
            {
                if (new_plan_sp->SetIterationCount(m_options.m_step_count) != m_options.m_step_count)
                {
                    result.AppendWarning ("step operation does not support iteration count.");
                }
            }

            process->GetThreadList().SetSelectedThreadByID (thread->GetID());
            process->Resume ();
        

            if (synchronous_execution)
            {
                StateType state = process->WaitForProcessToStop (NULL);
                
                //EventSP event_sp;
                //StateType state = process->WaitForStateChangedEvents (NULL, event_sp);
                //while (! StateIsStoppedState (state))
                //  {
                //    state = process->WaitForStateChangedEvents (NULL, event_sp);
                //  }
                process->GetThreadList().SetSelectedThreadByID (thread->GetID());
                result.SetDidChangeProcessState (true);
                result.AppendMessageWithFormat ("Process %" PRIu64 " %s\n", process->GetID(), StateAsCString (state));
                result.SetStatus (eReturnStatusSuccessFinishNoResult);
            }
            else
            {
                result.SetStatus (eReturnStatusSuccessContinuingNoResult);
            }
        }
        else
        {
            result.AppendError ("Couldn't find thread plan to implement step type.");
            result.SetStatus (eReturnStatusFailed);
        }
        return result.Succeeded();
    }

protected:
    StepType m_step_type;
    StepScope m_step_scope;
    CommandOptions m_options;
};

static OptionEnumValueElement
g_tri_running_mode[] =
{
{ eOnlyThisThread,     "this-thread",    "Run only this thread"},
{ eAllThreads,         "all-threads",    "Run all threads"},
{ eOnlyDuringStepping, "while-stepping", "Run only this thread while stepping"},
{ 0, NULL, NULL }
};

static OptionEnumValueElement
g_duo_running_mode[] =
{
{ eOnlyThisThread,     "this-thread",    "Run only this thread"},
{ eAllThreads,         "all-threads",    "Run all threads"},
{ 0, NULL, NULL }
};

OptionDefinition
CommandObjectThreadStepWithTypeAndScope::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_1, false, "step-in-avoids-no-debug",   'a', OptionParser::eRequiredArgument, NULL, NULL,               0, eArgTypeBoolean,     "A boolean value that sets whether stepping into functions will step over functions with no debug information."},
{ LLDB_OPT_SET_1, false, "step-out-avoids-no-debug",  'A', OptionParser::eRequiredArgument, NULL, NULL,               0, eArgTypeBoolean,     "A boolean value, if true stepping out of functions will continue to step out till it hits a function with debug information."},
{ LLDB_OPT_SET_1, false, "count",           'c', OptionParser::eRequiredArgument, NULL, NULL,               1, eArgTypeCount,     "How many times to perform the stepping operation - currently only supported for step-inst and next-inst."},
{ LLDB_OPT_SET_1, false, "run-mode",        'm', OptionParser::eRequiredArgument, NULL, g_tri_running_mode, 0, eArgTypeRunMode, "Determine how to run other threads while stepping the current thread."},
{ LLDB_OPT_SET_1, false, "step-over-regexp",'r', OptionParser::eRequiredArgument, NULL, NULL,               0, eArgTypeRegularExpression,   "A regular expression that defines function names to not to stop at when stepping in."},
{ LLDB_OPT_SET_1, false, "step-in-target",  't', OptionParser::eRequiredArgument, NULL, NULL,               0, eArgTypeFunctionName,   "The name of the directly called function step in should stop at when stepping into."},
{ 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};


//-------------------------------------------------------------------------
// CommandObjectThreadContinue
//-------------------------------------------------------------------------

class CommandObjectThreadContinue : public CommandObjectParsed
{
public:

    CommandObjectThreadContinue (CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter, 
                             "thread continue",
                             "Continue execution of one or more threads in an active process.",
                             NULL,
                             eFlagRequiresThread        |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused)
    {
        CommandArgumentEntry arg;
        CommandArgumentData thread_idx_arg;
        
        // Define the first (and only) variant of this arg.
        thread_idx_arg.arg_type = eArgTypeThreadIndex;
        thread_idx_arg.arg_repetition = eArgRepeatPlus;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (thread_idx_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }


    virtual
    ~CommandObjectThreadContinue ()
    {
    }

    virtual bool
    DoExecute (Args& command, CommandReturnObject &result)
    {
        bool synchronous_execution = m_interpreter.GetSynchronous ();

        if (!m_interpreter.GetDebugger().GetSelectedTarget().get())
        {
            result.AppendError ("invalid target, create a debug target using the 'target create' command");
            result.SetStatus (eReturnStatusFailed);
            return false;
        }

        Process *process = m_exe_ctx.GetProcessPtr();
        if (process == NULL)
        {
            result.AppendError ("no process exists. Cannot continue");
            result.SetStatus (eReturnStatusFailed);
            return false;
        }

        StateType state = process->GetState();
        if ((state == eStateCrashed) || (state == eStateStopped) || (state == eStateSuspended))
        {
            const size_t argc = command.GetArgumentCount();
            if (argc > 0)
            {
                // These two lines appear at the beginning of both blocks in
                // this if..else, but that is because we need to release the
                // lock before calling process->Resume below.
                Mutex::Locker locker (process->GetThreadList().GetMutex());
                const uint32_t num_threads = process->GetThreadList().GetSize();
                std::vector<Thread *> resume_threads;
                for (uint32_t i=0; i<argc; ++i)
                {
                    bool success;
                    const int base = 0;
                    uint32_t thread_idx = Args::StringToUInt32 (command.GetArgumentAtIndex(i), LLDB_INVALID_INDEX32, base, &success);
                    if (success)
                    {
                        Thread *thread = process->GetThreadList().FindThreadByIndexID(thread_idx).get();

                        if (thread)
                        {
                            resume_threads.push_back(thread);
                        }
                        else
                        {
                            result.AppendErrorWithFormat("invalid thread index %u.\n", thread_idx);
                            result.SetStatus (eReturnStatusFailed);
                            return false;
                        }
                    }
                    else
                    {
                        result.AppendErrorWithFormat ("invalid thread index argument: \"%s\".\n", command.GetArgumentAtIndex(i));
                        result.SetStatus (eReturnStatusFailed);
                        return false;
                    }
                }

                if (resume_threads.empty())
                {
                    result.AppendError ("no valid thread indexes were specified");
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                else
                {
                    if (resume_threads.size() == 1)
                        result.AppendMessageWithFormat ("Resuming thread: ");
                    else
                        result.AppendMessageWithFormat ("Resuming threads: ");

                    for (uint32_t idx=0; idx<num_threads; ++idx)
                    {
                        Thread *thread = process->GetThreadList().GetThreadAtIndex(idx).get();
                        std::vector<Thread *>::iterator this_thread_pos = find(resume_threads.begin(), resume_threads.end(), thread);

                        if (this_thread_pos != resume_threads.end())
                        {
                            resume_threads.erase(this_thread_pos);
                            if (resume_threads.size() > 0)
                                result.AppendMessageWithFormat ("%u, ", thread->GetIndexID());
                            else
                                result.AppendMessageWithFormat ("%u ", thread->GetIndexID());
                            
                            const bool override_suspend = true;
                            thread->SetResumeState (eStateRunning, override_suspend);
                        }
                        else
                        {
                            thread->SetResumeState (eStateSuspended);
                        }
                    }
                    result.AppendMessageWithFormat ("in process %" PRIu64 "\n", process->GetID());
                }
            }
            else
            {
                // These two lines appear at the beginning of both blocks in
                // this if..else, but that is because we need to release the
                // lock before calling process->Resume below.
                Mutex::Locker locker (process->GetThreadList().GetMutex());
                const uint32_t num_threads = process->GetThreadList().GetSize();
                Thread *current_thread = process->GetThreadList().GetSelectedThread().get();
                if (current_thread == NULL)
                {
                    result.AppendError ("the process doesn't have a current thread");
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                // Set the actions that the threads should each take when resuming
                for (uint32_t idx=0; idx<num_threads; ++idx)
                {
                    Thread *thread = process->GetThreadList().GetThreadAtIndex(idx).get();
                    if (thread == current_thread)
                    {
                        result.AppendMessageWithFormat ("Resuming thread 0x%4.4" PRIx64 " in process %" PRIu64 "\n", thread->GetID(), process->GetID());
                        const bool override_suspend = true;
                        thread->SetResumeState (eStateRunning, override_suspend);
                    }
                    else
                    {
                        thread->SetResumeState (eStateSuspended);
                    }
                }
            }

            // We should not be holding the thread list lock when we do this.
            Error error (process->Resume());
            if (error.Success())
            {
                result.AppendMessageWithFormat ("Process %" PRIu64 " resuming\n", process->GetID());
                if (synchronous_execution)
                {
                    state = process->WaitForProcessToStop (NULL);

                    result.SetDidChangeProcessState (true);
                    result.AppendMessageWithFormat ("Process %" PRIu64 " %s\n", process->GetID(), StateAsCString (state));
                    result.SetStatus (eReturnStatusSuccessFinishNoResult);
                }
                else
                {
                    result.SetStatus (eReturnStatusSuccessContinuingNoResult);
                }
            }
            else
            {
                result.AppendErrorWithFormat("Failed to resume process: %s\n", error.AsCString());
                result.SetStatus (eReturnStatusFailed);
            }
        }
        else
        {
            result.AppendErrorWithFormat ("Process cannot be continued from its current state (%s).\n",
                                          StateAsCString(state));
            result.SetStatus (eReturnStatusFailed);
        }

        return result.Succeeded();
    }

};

//-------------------------------------------------------------------------
// CommandObjectThreadUntil
//-------------------------------------------------------------------------

class CommandObjectThreadUntil : public CommandObjectParsed
{
public:

    class CommandOptions : public Options
    {
    public:
        uint32_t m_thread_idx;
        uint32_t m_frame_idx;

        CommandOptions (CommandInterpreter &interpreter) :
            Options (interpreter),
            m_thread_idx(LLDB_INVALID_THREAD_ID),
            m_frame_idx(LLDB_INVALID_FRAME_ID)
        {
            // Keep default values of all options in one place: OptionParsingStarting ()
            OptionParsingStarting ();
        }

        virtual
        ~CommandOptions ()
        {
        }

        virtual Error
        SetOptionValue (uint32_t option_idx, const char *option_arg)
        {
            Error error;
            const int short_option = m_getopt_table[option_idx].val;

            switch (short_option)
            {
                case 't':
                {
                    m_thread_idx = Args::StringToUInt32 (option_arg, LLDB_INVALID_INDEX32);
                    if (m_thread_idx == LLDB_INVALID_INDEX32)
                    {
                        error.SetErrorStringWithFormat ("invalid thread index '%s'", option_arg);
                    }
                }
                break;
                case 'f':
                {
                    m_frame_idx = Args::StringToUInt32 (option_arg, LLDB_INVALID_FRAME_ID);
                    if (m_frame_idx == LLDB_INVALID_FRAME_ID)
                    {
                        error.SetErrorStringWithFormat ("invalid frame index '%s'", option_arg);
                    }
                }
                break;
                case 'm':
                {
                    OptionEnumValueElement *enum_values = g_option_table[option_idx].enum_values; 
                    lldb::RunMode run_mode = (lldb::RunMode) Args::StringToOptionEnum(option_arg, enum_values, eOnlyDuringStepping, error);

                    if (error.Success())
                    {
                        if (run_mode == eAllThreads)
                            m_stop_others = false;
                        else
                            m_stop_others = true;
                    }
                }
                break;
                default:
                    error.SetErrorStringWithFormat("invalid short option character '%c'", short_option);
                    break;

            }
            return error;
        }

        void
        OptionParsingStarting ()
        {
            m_thread_idx = LLDB_INVALID_THREAD_ID;
            m_frame_idx = 0;
            m_stop_others = false;
        }

        const OptionDefinition*
        GetDefinitions ()
        {
            return g_option_table;
        }

        uint32_t m_step_thread_idx;
        bool m_stop_others;

        // Options table: Required for subclasses of Options.

        static OptionDefinition g_option_table[];

        // Instance variables to hold the values for command options.
    };

    CommandObjectThreadUntil (CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter, 
                             "thread until",
                             "Run the current or specified thread until it reaches a given line number or leaves the current function.",
                             NULL,
                             eFlagRequiresThread        |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused   ),
        m_options (interpreter)
    {
        CommandArgumentEntry arg;
        CommandArgumentData line_num_arg;
        
        // Define the first (and only) variant of this arg.
        line_num_arg.arg_type = eArgTypeLineNum;
        line_num_arg.arg_repetition = eArgRepeatPlain;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (line_num_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }


    virtual
    ~CommandObjectThreadUntil ()
    {
    }

    virtual
    Options *
    GetOptions ()
    {
        return &m_options;
    }

protected:
    virtual bool
    DoExecute (Args& command, CommandReturnObject &result)
    {
        bool synchronous_execution = m_interpreter.GetSynchronous ();

        Target *target = m_interpreter.GetDebugger().GetSelectedTarget().get();
        if (target == NULL)
        {
            result.AppendError ("invalid target, create a debug target using the 'target create' command");
            result.SetStatus (eReturnStatusFailed);
            return false;
        }

        Process *process = m_exe_ctx.GetProcessPtr();
        if (process == NULL)
        {
            result.AppendError ("need a valid process to step");
            result.SetStatus (eReturnStatusFailed);

        }
        else
        {
            Thread *thread = NULL;
            uint32_t line_number;

            if (command.GetArgumentCount() != 1)
            {
                result.AppendErrorWithFormat ("No line number provided:\n%s", GetSyntax());
                result.SetStatus (eReturnStatusFailed);
                return false;
            }

            line_number = Args::StringToUInt32 (command.GetArgumentAtIndex(0), UINT32_MAX);
            if (line_number == UINT32_MAX)
            {
                result.AppendErrorWithFormat ("invalid line number: '%s'.\n", command.GetArgumentAtIndex(0));
                result.SetStatus (eReturnStatusFailed);
                return false;
            }

            if (m_options.m_thread_idx == LLDB_INVALID_THREAD_ID)
            {
                thread = process->GetThreadList().GetSelectedThread().get();
            }
            else
            {
                thread = process->GetThreadList().FindThreadByIndexID(m_options.m_thread_idx).get();
            }

            if (thread == NULL)
            {
                const uint32_t num_threads = process->GetThreadList().GetSize();
                result.AppendErrorWithFormat ("Thread index %u is out of range (valid values are 0 - %u).\n", 
                                              m_options.m_thread_idx, 
                                              num_threads);
                result.SetStatus (eReturnStatusFailed);
                return false;
            }

            const bool abort_other_plans = false;

            StackFrame *frame = thread->GetStackFrameAtIndex(m_options.m_frame_idx).get();
            if (frame == NULL)
            {

                result.AppendErrorWithFormat ("Frame index %u is out of range for thread %u.\n", 
                                              m_options.m_frame_idx, 
                                              m_options.m_thread_idx);
                result.SetStatus (eReturnStatusFailed);
                return false;
            }

            ThreadPlanSP new_plan_sp;

            if (frame->HasDebugInformation ())
            {
                // Finally we got here...  Translate the given line number to a bunch of addresses:
                SymbolContext sc(frame->GetSymbolContext (eSymbolContextCompUnit));
                LineTable *line_table = NULL;
                if (sc.comp_unit)
                    line_table = sc.comp_unit->GetLineTable();

                if (line_table == NULL)
                {
                    result.AppendErrorWithFormat ("Failed to resolve the line table for frame %u of thread index %u.\n",
                                                 m_options.m_frame_idx, m_options.m_thread_idx);
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }

                LineEntry function_start;
                uint32_t index_ptr = 0, end_ptr;
                std::vector<addr_t> address_list;

                // Find the beginning & end index of the
                AddressRange fun_addr_range = sc.function->GetAddressRange();
                Address fun_start_addr = fun_addr_range.GetBaseAddress();
                line_table->FindLineEntryByAddress (fun_start_addr, function_start, &index_ptr);

                Address fun_end_addr(fun_start_addr.GetSection(), 
                                     fun_start_addr.GetOffset() + fun_addr_range.GetByteSize());
                line_table->FindLineEntryByAddress (fun_end_addr, function_start, &end_ptr);

                bool all_in_function = true;
                
                while (index_ptr <= end_ptr)
                {
                    LineEntry line_entry;
                    const bool exact = false;
                    index_ptr = sc.comp_unit->FindLineEntry(index_ptr, line_number, sc.comp_unit, exact, &line_entry);
                    if (index_ptr == UINT32_MAX)
                        break;

                    addr_t address = line_entry.range.GetBaseAddress().GetLoadAddress(target);
                    if (address != LLDB_INVALID_ADDRESS)
                    {
                        if (fun_addr_range.ContainsLoadAddress (address, target))
                            address_list.push_back (address);
                        else
                            all_in_function = false;
                    }
                    index_ptr++;
                }

                if (address_list.size() == 0)
                {
                    if (all_in_function)
                        result.AppendErrorWithFormat ("No line entries matching until target.\n");
                    else
                        result.AppendErrorWithFormat ("Until target outside of the current function.\n");
                        
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                
                new_plan_sp = thread->QueueThreadPlanForStepUntil (abort_other_plans,
                                                                &address_list.front(), 
                                                                address_list.size(), 
                                                                m_options.m_stop_others, 
                                                                m_options.m_frame_idx);
                // User level plans should be master plans so they can be interrupted (e.g. by hitting a breakpoint)
                // and other plans executed by the user (stepping around the breakpoint) and then a "continue"
                // will resume the original plan.
                new_plan_sp->SetIsMasterPlan (true);
                new_plan_sp->SetOkayToDiscard(false);
            }
            else
            {
                result.AppendErrorWithFormat ("Frame index %u of thread %u has no debug information.\n", 
                                              m_options.m_frame_idx, 
                                              m_options.m_thread_idx);
                result.SetStatus (eReturnStatusFailed);
                return false;

            }

            process->GetThreadList().SetSelectedThreadByID (m_options.m_thread_idx);
            Error error (process->Resume ());
            if (error.Success())
            {
                result.AppendMessageWithFormat ("Process %" PRIu64 " resuming\n", process->GetID());
                if (synchronous_execution)
                {
                    StateType state = process->WaitForProcessToStop (NULL);

                    result.SetDidChangeProcessState (true);
                    result.AppendMessageWithFormat ("Process %" PRIu64 " %s\n", process->GetID(), StateAsCString (state));
                    result.SetStatus (eReturnStatusSuccessFinishNoResult);
                }
                else
                {
                    result.SetStatus (eReturnStatusSuccessContinuingNoResult);
                }
            }
            else
            {
                result.AppendErrorWithFormat("Failed to resume process: %s.\n", error.AsCString());
                result.SetStatus (eReturnStatusFailed);
            }

        }
        return result.Succeeded();
    }

    CommandOptions m_options;

};

OptionDefinition
CommandObjectThreadUntil::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_1, false, "frame",   'f', OptionParser::eRequiredArgument, NULL, NULL,               0, eArgTypeFrameIndex,   "Frame index for until operation - defaults to 0"},
{ LLDB_OPT_SET_1, false, "thread",  't', OptionParser::eRequiredArgument, NULL, NULL,               0, eArgTypeThreadIndex,  "Thread index for the thread for until operation"},
{ LLDB_OPT_SET_1, false, "run-mode",'m', OptionParser::eRequiredArgument, NULL, g_duo_running_mode, 0, eArgTypeRunMode,"Determine how to run other threads while stepping this one"},
{ 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};


//-------------------------------------------------------------------------
// CommandObjectThreadSelect
//-------------------------------------------------------------------------

class CommandObjectThreadSelect : public CommandObjectParsed
{
public:

    CommandObjectThreadSelect (CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter,
                             "thread select",
                             "Select a thread as the currently active thread.",
                             NULL,
                             eFlagRequiresProcess       |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused   )
    {
        CommandArgumentEntry arg;
        CommandArgumentData thread_idx_arg;
        
        // Define the first (and only) variant of this arg.
        thread_idx_arg.arg_type = eArgTypeThreadIndex;
        thread_idx_arg.arg_repetition = eArgRepeatPlain;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (thread_idx_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }


    virtual
    ~CommandObjectThreadSelect ()
    {
    }

protected:
    virtual bool
    DoExecute (Args& command, CommandReturnObject &result)
    {
        Process *process = m_exe_ctx.GetProcessPtr();
        if (process == NULL)
        {
            result.AppendError ("no process");
            result.SetStatus (eReturnStatusFailed);
            return false;
        }
        else if (command.GetArgumentCount() != 1)
        {
            result.AppendErrorWithFormat("'%s' takes exactly one thread index argument:\nUsage: %s\n", m_cmd_name.c_str(), m_cmd_syntax.c_str());
            result.SetStatus (eReturnStatusFailed);
            return false;
        }

        uint32_t index_id = Args::StringToUInt32(command.GetArgumentAtIndex(0), 0, 0);

        Thread *new_thread = process->GetThreadList().FindThreadByIndexID(index_id).get();
        if (new_thread == NULL)
        {
            result.AppendErrorWithFormat ("invalid thread #%s.\n", command.GetArgumentAtIndex(0));
            result.SetStatus (eReturnStatusFailed);
            return false;
        }

        process->GetThreadList().SetSelectedThreadByID(new_thread->GetID(), true);
        result.SetStatus (eReturnStatusSuccessFinishNoResult);
        
        return result.Succeeded();
    }

};


//-------------------------------------------------------------------------
// CommandObjectThreadList
//-------------------------------------------------------------------------

class CommandObjectThreadList : public CommandObjectParsed
{
public:


    CommandObjectThreadList (CommandInterpreter &interpreter):
        CommandObjectParsed (interpreter,
                             "thread list",
                             "Show a summary of all current threads in a process.",
                             "thread list",
                             eFlagRequiresProcess       |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused   )
    {
    }

    ~CommandObjectThreadList()
    {
    }

protected:
    bool
    DoExecute (Args& command, CommandReturnObject &result)
    {
        Stream &strm = result.GetOutputStream();
        result.SetStatus (eReturnStatusSuccessFinishNoResult);
        Process *process = m_exe_ctx.GetProcessPtr();
        const bool only_threads_with_stop_reason = false;
        const uint32_t start_frame = 0;
        const uint32_t num_frames = 0;
        const uint32_t num_frames_with_source = 0;
        process->GetStatus(strm);
        process->GetThreadStatus (strm, 
                                  only_threads_with_stop_reason, 
                                  start_frame,
                                  num_frames,
                                  num_frames_with_source);            
        return result.Succeeded();
    }
};

//-------------------------------------------------------------------------
// CommandObjectThreadInfo
//-------------------------------------------------------------------------

class CommandObjectThreadInfo : public CommandObjectParsed
{
public:

    CommandObjectThreadInfo (CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter, 
                             "thread info",
                             "Show an extended summary of information about thread(s) in a process.",
                             "thread info",
                             eFlagRequiresProcess       |
                             eFlagTryTargetAPILock      |
                             eFlagProcessMustBeLaunched |
                             eFlagProcessMustBePaused),
        m_options (interpreter)
    {
        CommandArgumentEntry arg;
        CommandArgumentData thread_idx_arg;
        
        thread_idx_arg.arg_type = eArgTypeThreadIndex;
        thread_idx_arg.arg_repetition = eArgRepeatStar;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (thread_idx_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }

    class CommandOptions : public Options
    {
    public:

        CommandOptions (CommandInterpreter &interpreter) :
            Options (interpreter)
        {
            OptionParsingStarting ();
        }

        void
        OptionParsingStarting ()
        {
            m_json = false;
        }

        virtual
        ~CommandOptions ()
        {
        }

        virtual Error
        SetOptionValue (uint32_t option_idx, const char *option_arg)
        {
            const int short_option = m_getopt_table[option_idx].val;
            Error error;

            switch (short_option)
            {
                case 'j':
                    m_json = true;
                    break;

                 default:
                    return Error("invalid short option character '%c'", short_option);

            }
            return error;
        }

        const OptionDefinition*
        GetDefinitions ()
        {
            return g_option_table;
        }

        bool m_json;

        static OptionDefinition g_option_table[];
    };

    virtual
    Options *
    GetOptions ()
    {
        return &m_options;
    }


    virtual
    ~CommandObjectThreadInfo ()
    {
    }

    virtual bool
    DoExecute (Args& command, CommandReturnObject &result)
    {
        result.SetStatus (eReturnStatusSuccessFinishResult);
        Stream &strm = result.GetOutputStream();

        if (command.GetArgumentCount() == 0)
        {
            Thread *thread = m_exe_ctx.GetThreadPtr();
            if (thread->GetDescription (strm, eDescriptionLevelFull, m_options.m_json))
            {
                result.SetStatus (eReturnStatusSuccessFinishResult);
            }
        }
        else if (command.GetArgumentCount() == 1 && ::strcmp (command.GetArgumentAtIndex(0), "all") == 0)
        {
            Process *process = m_exe_ctx.GetProcessPtr();
            uint32_t idx = 0;
            for (ThreadSP thread_sp : process->Threads())
            {
                if (idx != 0)
                    result.AppendMessage("");
                if (!thread_sp->GetDescription (strm, eDescriptionLevelFull, m_options.m_json))
                {
                    result.AppendErrorWithFormat ("error displaying info for thread: \"0x%4.4x\"\n", idx);
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                ++idx;
            }
        }
        else
        {
            const size_t num_args = command.GetArgumentCount();
            Process *process = m_exe_ctx.GetProcessPtr();
            Mutex::Locker locker (process->GetThreadList().GetMutex());
            std::vector<ThreadSP> thread_sps;

            for (size_t i = 0; i < num_args; i++)
            {
                bool success;
                
                uint32_t thread_idx = Args::StringToUInt32(command.GetArgumentAtIndex(i), 0, 0, &success);
                if (!success)
                {
                    result.AppendErrorWithFormat ("invalid thread specification: \"%s\"\n", command.GetArgumentAtIndex(i));
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                
                thread_sps.push_back(process->GetThreadList().FindThreadByIndexID(thread_idx));
                
                if (!thread_sps[i])
                {
                    result.AppendErrorWithFormat ("no thread with index: \"%s\"\n", command.GetArgumentAtIndex(i));
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                
            }
            
            for (uint32_t i = 0; i < num_args; i++)
            {
                if (!thread_sps[i]->GetDescription (strm, eDescriptionLevelFull, m_options.m_json))
                {
                    result.AppendErrorWithFormat ("error displaying info for thread: \"%s\"\n", command.GetArgumentAtIndex(i));
                    result.SetStatus (eReturnStatusFailed);
                    return false;
                }
                
                if (i < num_args - 1)
                    result.AppendMessage("");
            }

        }
        return result.Succeeded();
    }

    CommandOptions m_options;

};

OptionDefinition
CommandObjectThreadInfo::CommandOptions::g_option_table[] =
{
    { LLDB_OPT_SET_ALL, false, "json",'j', OptionParser::eNoArgument, NULL, NULL, 0, eArgTypeNone, "Display the thread info in JSON format."},

    { 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};


//-------------------------------------------------------------------------
// CommandObjectThreadReturn
//-------------------------------------------------------------------------

class CommandObjectThreadReturn : public CommandObjectRaw
{
public:
    class CommandOptions : public Options
    {
    public:

        CommandOptions (CommandInterpreter &interpreter) :
            Options (interpreter),
            m_from_expression (false)
        {
            // Keep default values of all options in one place: OptionParsingStarting ()
            OptionParsingStarting ();
        }

        virtual
        ~CommandOptions ()
        {
        }

        virtual Error
        SetOptionValue (uint32_t option_idx, const char *option_arg)
        {
            Error error;
            const int short_option = m_getopt_table[option_idx].val;

            switch (short_option)
            {
                case 'x':
                {
                    bool success;
                    bool tmp_value = Args::StringToBoolean (option_arg, false, &success);
                    if (success)
                        m_from_expression = tmp_value;
                    else
                    {
                        error.SetErrorStringWithFormat ("invalid boolean value '%s' for 'x' option", option_arg);
                    }
                }
                break;
                default:
                    error.SetErrorStringWithFormat("invalid short option character '%c'", short_option);
                    break;

            }
            return error;
        }

        void
        OptionParsingStarting ()
        {
            m_from_expression = false;
        }

        const OptionDefinition*
        GetDefinitions ()
        {
            return g_option_table;
        }

        bool m_from_expression;

        // Options table: Required for subclasses of Options.

        static OptionDefinition g_option_table[];

        // Instance variables to hold the values for command options.
    };

    virtual
    Options *
    GetOptions ()
    {
        return &m_options;
    }

    CommandObjectThreadReturn (CommandInterpreter &interpreter) :
        CommandObjectRaw (interpreter,
                          "thread return",
                          "Return from the currently selected frame, short-circuiting execution of the frames below it, with an optional return value,"
                          " or with the -x option from the innermost function evaluation.",
                          "thread return",
                          eFlagRequiresFrame         |
                          eFlagTryTargetAPILock      |
                          eFlagProcessMustBeLaunched |
                          eFlagProcessMustBePaused   ),
        m_options (interpreter)
    {
        CommandArgumentEntry arg;
        CommandArgumentData expression_arg;

        // Define the first (and only) variant of this arg.
        expression_arg.arg_type = eArgTypeExpression;
        expression_arg.arg_repetition = eArgRepeatOptional;

        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (expression_arg);

        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
        
        
    }
    
    ~CommandObjectThreadReturn()
    {
    }
    
protected:

    bool DoExecute
    (
        const char *command,
        CommandReturnObject &result
    )
    {
        // I am going to handle this by hand, because I don't want you to have to say:
        // "thread return -- -5".
        if (command[0] == '-' && command[1] == 'x')
        {
            if (command && command[2] != '\0')
                result.AppendWarning("Return values ignored when returning from user called expressions");
            
            Thread *thread = m_exe_ctx.GetThreadPtr();
            Error error;
            error = thread->UnwindInnermostExpression();
            if (!error.Success())
            {
                result.AppendErrorWithFormat ("Unwinding expression failed - %s.", error.AsCString());
                result.SetStatus (eReturnStatusFailed);
            }
            else
            {
                bool success = thread->SetSelectedFrameByIndexNoisily (0, result.GetOutputStream());
                if (success)
                {
                    m_exe_ctx.SetFrameSP(thread->GetSelectedFrame ());
                    result.SetStatus (eReturnStatusSuccessFinishResult);
                }
                else
                {
                    result.AppendErrorWithFormat ("Could not select 0th frame after unwinding expression.");
                    result.SetStatus (eReturnStatusFailed);
                }
            }
            return result.Succeeded();
        }
        
        ValueObjectSP return_valobj_sp;
        
        StackFrameSP frame_sp = m_exe_ctx.GetFrameSP();
        uint32_t frame_idx = frame_sp->GetFrameIndex();
        
        if (frame_sp->IsInlined())
        {
            result.AppendError("Don't know how to return from inlined frames.");
            result.SetStatus (eReturnStatusFailed);
            return false;
        }
        
        if (command && command[0] != '\0')
        {
            Target *target = m_exe_ctx.GetTargetPtr();
            EvaluateExpressionOptions options;

            options.SetUnwindOnError(true);
            options.SetUseDynamic(eNoDynamicValues);
            
            ExpressionResults exe_results = eExpressionSetupError;
            exe_results = target->EvaluateExpression (command,
                                                      frame_sp.get(),
                                                      return_valobj_sp,
                                                      options);
            if (exe_results != eExpressionCompleted)
            {
                if (return_valobj_sp)
                    result.AppendErrorWithFormat("Error evaluating result expression: %s", return_valobj_sp->GetError().AsCString());
                else
                    result.AppendErrorWithFormat("Unknown error evaluating result expression.");
                result.SetStatus (eReturnStatusFailed);
                return false;
            
            }
        }
                
        Error error;
        ThreadSP thread_sp = m_exe_ctx.GetThreadSP();
        const bool broadcast = true;
        error = thread_sp->ReturnFromFrame (frame_sp, return_valobj_sp, broadcast);
        if (!error.Success())
        {
            result.AppendErrorWithFormat("Error returning from frame %d of thread %d: %s.", frame_idx, thread_sp->GetIndexID(), error.AsCString());
            result.SetStatus (eReturnStatusFailed);
            return false;
        }

        result.SetStatus (eReturnStatusSuccessFinishResult);
        return true;
    }
    
    CommandOptions m_options;

};
OptionDefinition
CommandObjectThreadReturn::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_ALL, false, "from-expression",  'x', OptionParser::eNoArgument, NULL, NULL,               0, eArgTypeNone,     "Return from the innermost expression evaluation."},
{ 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};

//-------------------------------------------------------------------------
// CommandObjectThreadJump
//-------------------------------------------------------------------------

class CommandObjectThreadJump : public CommandObjectParsed
{
public:
    class CommandOptions : public Options
    {
    public:

        CommandOptions (CommandInterpreter &interpreter) :
            Options (interpreter)
        {
            OptionParsingStarting ();
        }

        void
        OptionParsingStarting ()
        {
            m_filenames.Clear();
            m_line_num = 0;
            m_line_offset = 0;
            m_load_addr = LLDB_INVALID_ADDRESS;
            m_force = false;
        }

        virtual
        ~CommandOptions ()
        {
        }

        virtual Error
        SetOptionValue (uint32_t option_idx, const char *option_arg)
        {
            bool success;
            const int short_option = m_getopt_table[option_idx].val;
            Error error;

            switch (short_option)
            {
                case 'f':
                    m_filenames.AppendIfUnique (FileSpec(option_arg, false));
                    if (m_filenames.GetSize() > 1)
                        return Error("only one source file expected.");
                    break;
                case 'l':
                    m_line_num = Args::StringToUInt32 (option_arg, 0, 0, &success);
                    if (!success || m_line_num == 0)
                        return Error("invalid line number: '%s'.", option_arg);
                    break;
                case 'b':
                    m_line_offset = Args::StringToSInt32 (option_arg, 0, 0, &success);
                    if (!success)
                        return Error("invalid line offset: '%s'.", option_arg);
                    break;
                case 'a':
                    {
                        ExecutionContext exe_ctx (m_interpreter.GetExecutionContext());
                        m_load_addr = Args::StringToAddress(&exe_ctx, option_arg, LLDB_INVALID_ADDRESS, &error);
                    }
                    break;
                case 'r':
                    m_force = true;
                    break;

                 default:
                    return Error("invalid short option character '%c'", short_option);

            }
            return error;
        }

        const OptionDefinition*
        GetDefinitions ()
        {
            return g_option_table;
        }

        FileSpecList m_filenames;
        uint32_t m_line_num;
        int32_t m_line_offset;
        lldb::addr_t m_load_addr;
        bool m_force;

        static OptionDefinition g_option_table[];
    };

    virtual
    Options *
    GetOptions ()
    {
        return &m_options;
    }

    CommandObjectThreadJump (CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter,
                          "thread jump",
                          "Sets the program counter to a new address.",
                          "thread jump",
                          eFlagRequiresFrame         |
                          eFlagTryTargetAPILock      |
                          eFlagProcessMustBeLaunched |
                          eFlagProcessMustBePaused   ),
        m_options (interpreter)
    {
    }

    ~CommandObjectThreadJump()
    {
    }

protected:

    bool DoExecute (Args& args, CommandReturnObject &result)
    {
        RegisterContext *reg_ctx = m_exe_ctx.GetRegisterContext();
        StackFrame *frame = m_exe_ctx.GetFramePtr();
        Thread *thread = m_exe_ctx.GetThreadPtr();
        Target *target = m_exe_ctx.GetTargetPtr();
        const SymbolContext &sym_ctx = frame->GetSymbolContext (eSymbolContextLineEntry);

        if (m_options.m_load_addr != LLDB_INVALID_ADDRESS)
        {
            // Use this address directly.
            Address dest = Address(m_options.m_load_addr);

            lldb::addr_t callAddr = dest.GetCallableLoadAddress (target);
            if (callAddr == LLDB_INVALID_ADDRESS)
            {
                result.AppendErrorWithFormat ("Invalid destination address.");
                result.SetStatus (eReturnStatusFailed);
                return false;
            }

            if (!reg_ctx->SetPC (callAddr))
            {
                result.AppendErrorWithFormat ("Error changing PC value for thread %d.", thread->GetIndexID());
                result.SetStatus (eReturnStatusFailed);
                return false;
            }
        }
        else
        {
            // Pick either the absolute line, or work out a relative one.
            int32_t line = (int32_t)m_options.m_line_num;
            if (line == 0)
                line = sym_ctx.line_entry.line + m_options.m_line_offset;

            // Try the current file, but override if asked.
            FileSpec file = sym_ctx.line_entry.file;
            if (m_options.m_filenames.GetSize() == 1)
                file = m_options.m_filenames.GetFileSpecAtIndex(0);

            if (!file)
            {
                result.AppendErrorWithFormat ("No source file available for the current location.");
                result.SetStatus (eReturnStatusFailed);
                return false;
            }

            std::string warnings;
            Error err = thread->JumpToLine (file, line, m_options.m_force, &warnings);

            if (err.Fail())
            {
                result.SetError (err);
                return false;
            }

            if (!warnings.empty())
                result.AppendWarning (warnings.c_str());
        }

        result.SetStatus (eReturnStatusSuccessFinishResult);
        return true;
    }

    CommandOptions m_options;
};
OptionDefinition
CommandObjectThreadJump::CommandOptions::g_option_table[] =
{
    { LLDB_OPT_SET_1, false, "file", 'f', OptionParser::eRequiredArgument, NULL, NULL, CommandCompletions::eSourceFileCompletion, eArgTypeFilename,
        "Specifies the source file to jump to."},

    { LLDB_OPT_SET_1, true, "line", 'l', OptionParser::eRequiredArgument, NULL, NULL, 0, eArgTypeLineNum,
        "Specifies the line number to jump to."},

    { LLDB_OPT_SET_2, true, "by", 'b', OptionParser::eRequiredArgument, NULL, NULL, 0, eArgTypeOffset,
        "Jumps by a relative line offset from the current line."},

    { LLDB_OPT_SET_3, true, "address", 'a', OptionParser::eRequiredArgument, NULL, NULL, 0, eArgTypeAddressOrExpression,
        "Jumps to a specific address."},

    { LLDB_OPT_SET_1|
      LLDB_OPT_SET_2|
      LLDB_OPT_SET_3, false, "force",'r', OptionParser::eNoArgument, NULL, NULL, 0, eArgTypeNone,"Allows the PC to leave the current function."},

    { 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};

//-------------------------------------------------------------------------
// CommandObjectMultiwordThread
//-------------------------------------------------------------------------

CommandObjectMultiwordThread::CommandObjectMultiwordThread (CommandInterpreter &interpreter) :
    CommandObjectMultiword (interpreter,
                            "thread",
                            "A set of commands for operating on one or more threads within a running process.",
                            "thread <subcommand> [<subcommand-options>]")
{
    LoadSubCommand ("backtrace",  CommandObjectSP (new CommandObjectThreadBacktrace (interpreter)));
    LoadSubCommand ("continue",   CommandObjectSP (new CommandObjectThreadContinue (interpreter)));
    LoadSubCommand ("list",       CommandObjectSP (new CommandObjectThreadList (interpreter)));
    LoadSubCommand ("return",     CommandObjectSP (new CommandObjectThreadReturn (interpreter)));
    LoadSubCommand ("jump",       CommandObjectSP (new CommandObjectThreadJump (interpreter)));
    LoadSubCommand ("select",     CommandObjectSP (new CommandObjectThreadSelect (interpreter)));
    LoadSubCommand ("until",      CommandObjectSP (new CommandObjectThreadUntil (interpreter)));
    LoadSubCommand ("info",       CommandObjectSP (new CommandObjectThreadInfo (interpreter)));
    LoadSubCommand ("step-in",    CommandObjectSP (new CommandObjectThreadStepWithTypeAndScope (
                                                    interpreter,
                                                    "thread step-in",
                                                    "Source level single step in specified thread (current thread, if none specified).",
                                                    NULL,
                                                    eStepTypeInto,
                                                    eStepScopeSource)));
    
    LoadSubCommand ("step-out",   CommandObjectSP (new CommandObjectThreadStepWithTypeAndScope (
                                                    interpreter,
                                                    "thread step-out",
                                                    "Finish executing the function of the currently selected frame and return to its call site in specified thread (current thread, if none specified).",
                                                    NULL,
                                                    eStepTypeOut,
                                                    eStepScopeSource)));

    LoadSubCommand ("step-over",   CommandObjectSP (new CommandObjectThreadStepWithTypeAndScope (
                                                    interpreter,
                                                    "thread step-over",
                                                    "Source level single step in specified thread (current thread, if none specified), stepping over calls.",
                                                    NULL,
                                                    eStepTypeOver,
                                                    eStepScopeSource)));

    LoadSubCommand ("step-inst",   CommandObjectSP (new CommandObjectThreadStepWithTypeAndScope (
                                                    interpreter,
                                                    "thread step-inst",
                                                    "Single step one instruction in specified thread (current thread, if none specified).",
                                                    NULL,
                                                    eStepTypeTrace,
                                                    eStepScopeInstruction)));

    LoadSubCommand ("step-inst-over", CommandObjectSP (new CommandObjectThreadStepWithTypeAndScope (
                                                    interpreter,
                                                    "thread step-inst-over",
                                                    "Single step one instruction in specified thread (current thread, if none specified), stepping over calls.",
                                                    NULL,
                                                    eStepTypeTraceOver,
                                                    eStepScopeInstruction)));
}

CommandObjectMultiwordThread::~CommandObjectMultiwordThread ()
{
}