lldb/source/Commands/CommandObjectLog.cpp

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

// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "CommandObjectLog.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Host/FileSpec.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Interpreter/Options.h"
#include "lldb/Core/RegularExpression.h"
#include "lldb/Core/Stream.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Symbol/LineTable.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"

using namespace lldb;
using namespace lldb_private;

class CommandObjectLogEnable : public CommandObjectParsed
{
public:
    //------------------------------------------------------------------
    // Constructors and Destructors
    //------------------------------------------------------------------
    CommandObjectLogEnable(CommandInterpreter &interpreter) :
        CommandObjectParsed(interpreter,
                            "log enable",
                            "Enable logging for a single log channel.",
                            nullptr),
        m_options (interpreter)
    {
        CommandArgumentEntry arg1;
        CommandArgumentEntry arg2;
        CommandArgumentData channel_arg;
        CommandArgumentData category_arg;
        
        // Define the first (and only) variant of this arg.
        channel_arg.arg_type = eArgTypeLogChannel;
        channel_arg.arg_repetition = eArgRepeatPlain;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg1.push_back (channel_arg);
        
        category_arg.arg_type = eArgTypeLogCategory;
        category_arg.arg_repetition = eArgRepeatPlus;

        arg2.push_back (category_arg);

        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg1);
        m_arguments.push_back (arg2);
    }

    ~CommandObjectLogEnable() override = default;

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

//    int
//    HandleArgumentCompletion (Args &input,
//                              int &cursor_index,
//                              int &cursor_char_position,
//                              OptionElementVector &opt_element_vector,
//                              int match_start_point,
//                              int max_return_elements,
//                              bool &word_complete,
//                              StringList &matches)
//    {
//        std::string completion_str (input.GetArgumentAtIndex(cursor_index));
//        completion_str.erase (cursor_char_position);
//        
//        if (cursor_index == 1)
//        {
//            //
//            Log::AutoCompleteChannelName (completion_str.c_str(), matches);
//        }
//        return matches.GetSize();
//    }
//

    class CommandOptions : public Options
    {
    public:
        CommandOptions (CommandInterpreter &interpreter) :
            Options (interpreter),
            log_file (),
            log_options (0)
        {
        }

        ~CommandOptions () override = default;

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

            switch (short_option)
            {
            case 'f':  log_file.SetFile(option_arg, true);                    break;
            case 't':  log_options |= LLDB_LOG_OPTION_THREADSAFE;             break;
            case 'v':  log_options |= LLDB_LOG_OPTION_VERBOSE;                break;
            case 'g':  log_options |= LLDB_LOG_OPTION_DEBUG;                  break;
            case 's':  log_options |= LLDB_LOG_OPTION_PREPEND_SEQUENCE;       break;
            case 'T':  log_options |= LLDB_LOG_OPTION_PREPEND_TIMESTAMP;      break;
            case 'p':  log_options |= LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD;break;
            case 'n':  log_options |= LLDB_LOG_OPTION_PREPEND_THREAD_NAME;    break;
            case 'S':  log_options |= LLDB_LOG_OPTION_BACKTRACE;              break;
            case 'a':  log_options |= LLDB_LOG_OPTION_APPEND;                 break;
            default:
                error.SetErrorStringWithFormat ("unrecognized option '%c'", short_option);
                break;
            }

            return error;
        }

        void
        OptionParsingStarting () override
        {
            log_file.Clear();
            log_options = 0;
        }

        const OptionDefinition*
        GetDefinitions () override
        {
            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.

        FileSpec log_file;
        uint32_t log_options;
    };

protected:
    bool
    DoExecute (Args& args,
             CommandReturnObject &result) override
    {
        if (args.GetArgumentCount() < 2)
        {
            result.AppendErrorWithFormat("%s takes a log channel and one or more log types.\n", m_cmd_name.c_str());
        }
        else
        {
            std::string channel(args.GetArgumentAtIndex(0));
            args.Shift ();  // Shift off the channel
            char log_file[PATH_MAX];
            if (m_options.log_file)
                m_options.log_file.GetPath(log_file, sizeof(log_file));
            else
                log_file[0] = '\0';
            bool success = m_interpreter.GetDebugger().EnableLog (channel.c_str(), 
                                                                  args.GetConstArgumentVector(), 
                                                                  log_file, 
                                                                  m_options.log_options, 
                                                                  result.GetErrorStream());
            if (success)
                result.SetStatus (eReturnStatusSuccessFinishNoResult);
            else
                result.SetStatus (eReturnStatusFailed);
        }    
        return result.Succeeded();
    }

    CommandOptions m_options;
};

OptionDefinition
CommandObjectLogEnable::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_1, false, "file",       'f', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeFilename,   "Set the destination file to log to."},
{ LLDB_OPT_SET_1, false, "threadsafe", 't', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,        "Enable thread safe logging to avoid interweaved log lines." },
{ LLDB_OPT_SET_1, false, "verbose",    'v', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Enable verbose logging." },
{ LLDB_OPT_SET_1, false, "debug",      'g', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Enable debug logging." },
{ LLDB_OPT_SET_1, false, "sequence",   's', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Prepend all log lines with an increasing integer sequence id." },
{ LLDB_OPT_SET_1, false, "timestamp",  'T', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Prepend all log lines with a timestamp." },
{ LLDB_OPT_SET_1, false, "pid-tid",    'p', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Prepend all log lines with the process and thread ID that generates the log line." },
{ LLDB_OPT_SET_1, false, "thread-name",'n', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Prepend all log lines with the thread name for the thread that generates the log line." },
{ LLDB_OPT_SET_1, false, "stack",      'S', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Append a stack backtrace to each log line." },
{ LLDB_OPT_SET_1, false, "append",     'a', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,       "Append to the log file instead of overwriting." },
{ 0, false, nullptr,                       0,  0,                 nullptr, nullptr, 0, eArgTypeNone,       nullptr }
};

class CommandObjectLogDisable : public CommandObjectParsed
{
public:
    //------------------------------------------------------------------
    // Constructors and Destructors
    //------------------------------------------------------------------
    CommandObjectLogDisable(CommandInterpreter &interpreter) :
        CommandObjectParsed(interpreter,
                            "log disable",
                            "Disable one or more log channel categories.",
                            nullptr)
    {
        CommandArgumentEntry arg1;
        CommandArgumentEntry arg2;
        CommandArgumentData channel_arg;
        CommandArgumentData category_arg;
        
        // Define the first (and only) variant of this arg.
        channel_arg.arg_type = eArgTypeLogChannel;
        channel_arg.arg_repetition = eArgRepeatPlain;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg1.push_back (channel_arg);
        
        category_arg.arg_type = eArgTypeLogCategory;
        category_arg.arg_repetition = eArgRepeatPlus;

        arg2.push_back (category_arg);

        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg1);
        m_arguments.push_back (arg2);
    }

    ~CommandObjectLogDisable() override = default;

protected:
    bool
    DoExecute (Args& args,
             CommandReturnObject &result) override
    {
        const size_t argc = args.GetArgumentCount();
        if (argc == 0)
        {
            result.AppendErrorWithFormat("%s takes a log channel and one or more log types.\n", m_cmd_name.c_str());
        }
        else
        {
            Log::Callbacks log_callbacks;

            std::string channel(args.GetArgumentAtIndex(0));
            args.Shift ();  // Shift off the channel
            if (Log::GetLogChannelCallbacks (ConstString(channel.c_str()), log_callbacks))
            {
                log_callbacks.disable (args.GetConstArgumentVector(), &result.GetErrorStream());
                result.SetStatus(eReturnStatusSuccessFinishNoResult);
            }
            else if (channel == "all")
            {
                Log::DisableAllLogChannels(&result.GetErrorStream());
            }
            else
            {
                LogChannelSP log_channel_sp (LogChannel::FindPlugin(channel.c_str()));
                if (log_channel_sp)
                {
                    log_channel_sp->Disable(args.GetConstArgumentVector(), &result.GetErrorStream());
                    result.SetStatus(eReturnStatusSuccessFinishNoResult);
                }
                else
                    result.AppendErrorWithFormat("Invalid log channel '%s'.\n", args.GetArgumentAtIndex(0));
            }
        }
        return result.Succeeded();
    }
};

class CommandObjectLogList : public CommandObjectParsed
{
public:
    //------------------------------------------------------------------
    // Constructors and Destructors
    //------------------------------------------------------------------
    CommandObjectLogList(CommandInterpreter &interpreter) :
        CommandObjectParsed(interpreter,
                            "log list",
                            "List the log categories for one or more log channels.  If none specified, lists them all.",
                            nullptr)
    {
        CommandArgumentEntry arg;
        CommandArgumentData channel_arg;
        
        // Define the first (and only) variant of this arg.
        channel_arg.arg_type = eArgTypeLogChannel;
        channel_arg.arg_repetition = eArgRepeatStar;
        
        // There is only one variant this argument could be; put it into the argument entry.
        arg.push_back (channel_arg);
        
        // Push the data for the first argument into the m_arguments vector.
        m_arguments.push_back (arg);
    }

    ~CommandObjectLogList() override = default;

protected:
    bool
    DoExecute (Args& args,
             CommandReturnObject &result) override
    {
        const size_t argc = args.GetArgumentCount();
        if (argc == 0)
        {
            Log::ListAllLogChannels (&result.GetOutputStream());
            result.SetStatus(eReturnStatusSuccessFinishResult);
        }
        else
        {
            for (size_t i=0; i<argc; ++i)
            {
                Log::Callbacks log_callbacks;

                std::string channel(args.GetArgumentAtIndex(i));
                if (Log::GetLogChannelCallbacks (ConstString(channel.c_str()), log_callbacks))
                {
                    log_callbacks.list_categories (&result.GetOutputStream());
                    result.SetStatus(eReturnStatusSuccessFinishResult);
                }
                else if (channel == "all")
                {
                    Log::ListAllLogChannels (&result.GetOutputStream());
                    result.SetStatus(eReturnStatusSuccessFinishResult);
                }
                else
                {
                    LogChannelSP log_channel_sp (LogChannel::FindPlugin(channel.c_str()));
                    if (log_channel_sp)
                    {
                        log_channel_sp->ListCategories(&result.GetOutputStream());
                        result.SetStatus(eReturnStatusSuccessFinishNoResult);
                    }
                    else
                        result.AppendErrorWithFormat("Invalid log channel '%s'.\n", args.GetArgumentAtIndex(0));
                }
            }
        }
        return result.Succeeded();
    }
};

class CommandObjectLogTimer : public CommandObjectParsed
{
public:
    //------------------------------------------------------------------
    // Constructors and Destructors
    //------------------------------------------------------------------
    CommandObjectLogTimer(CommandInterpreter &interpreter) :
        CommandObjectParsed (interpreter,
                           "log timers",
                           "Enable, disable, dump, and reset LLDB internal performance timers.",
                           "log timers < enable <depth> | disable | dump | increment <bool> | reset >")
    {
    }

    ~CommandObjectLogTimer() override = default;

protected:
    bool
    DoExecute (Args& args,
             CommandReturnObject &result) override
    {
        const size_t argc = args.GetArgumentCount();
        result.SetStatus(eReturnStatusFailed);

        if (argc == 1)
        {
            const char *sub_command = args.GetArgumentAtIndex(0);

            if (strcasecmp(sub_command, "enable") == 0)
            {
                Timer::SetDisplayDepth (UINT32_MAX);
                result.SetStatus(eReturnStatusSuccessFinishNoResult);
            }
            else if (strcasecmp(sub_command, "disable") == 0)
            {
                Timer::DumpCategoryTimes (&result.GetOutputStream());
                Timer::SetDisplayDepth (0);
                result.SetStatus(eReturnStatusSuccessFinishResult);
            }
            else if (strcasecmp(sub_command, "dump") == 0)
            {
                Timer::DumpCategoryTimes (&result.GetOutputStream());
                result.SetStatus(eReturnStatusSuccessFinishResult);
            }
            else if (strcasecmp(sub_command, "reset") == 0)
            {
                Timer::ResetCategoryTimes ();
                result.SetStatus(eReturnStatusSuccessFinishResult);
            }
        }
        else if (argc == 2)
        {
            const char *sub_command = args.GetArgumentAtIndex(0);

            if (strcasecmp(sub_command, "enable") == 0)
            {
                bool success;
                uint32_t depth = StringConvert::ToUInt32(args.GetArgumentAtIndex(1), 0, 0, &success);
                if (success)
                {
                    Timer::SetDisplayDepth (depth);
                    result.SetStatus(eReturnStatusSuccessFinishNoResult);
                }
                else
                    result.AppendError("Could not convert enable depth to an unsigned integer.");
            }
            if (strcasecmp(sub_command, "increment") == 0)
            {
                bool success;
                bool increment = Args::StringToBoolean(args.GetArgumentAtIndex(1), false, &success);
                if (success)
                {
                    Timer::SetQuiet (!increment);
                    result.SetStatus(eReturnStatusSuccessFinishNoResult);
                }
                else
                    result.AppendError("Could not convert increment value to boolean.");
            }
        }
        
        if (!result.Succeeded())
        {
            result.AppendError("Missing subcommand");
            result.AppendErrorWithFormat("Usage: %s\n", m_cmd_syntax.c_str());
        }
        return result.Succeeded();
    }
};

CommandObjectLog::CommandObjectLog(CommandInterpreter &interpreter)
    : CommandObjectMultiword(interpreter, "log", "Commands controlling LLDB internal logging.",
                             "log <subcommand> [<command-options>]")
{
    LoadSubCommand ("enable",  CommandObjectSP (new CommandObjectLogEnable (interpreter)));
    LoadSubCommand ("disable", CommandObjectSP (new CommandObjectLogDisable (interpreter)));
    LoadSubCommand ("list",    CommandObjectSP (new CommandObjectLogList (interpreter)));
    LoadSubCommand ("timers",  CommandObjectSP (new CommandObjectLogTimer (interpreter)));
}

CommandObjectLog::~CommandObjectLog() = default;