Quelle profile.c Sprache: C

/****************************************************************************
**
**  This file is part of GAP, a system for computational discrete algebra.
**
**  Copyright of GAP belongs to its developers, whose names are too numerous
**  to list here. Please refer to the COPYRIGHT file for details.
**
**  SPDX-License-Identifier: GPL-2.0-or-later
**
**  This file contains profile related functionality.
**
*/

#include "profile.h"

#include "bool.h"
#include "calls.h"
#include "code.h"
#include "error.h"
#include "funcs.h"
#include "gaptime.h"
#include "hookintrprtr.h"
#include "io.h"
#include "lists.h"
#include "modules.h"
#include "plist.h"
#include "stringobj.h"
#include "sysfiles.h"
#include "sysstr.h"
#include "trycatch.h"
#include "vars.h"

#include "hpc/thread.h"

#include "config.h"

#include <stdio.h>                      // for fprintf, fflush, popen, pclose, fopen, fclose
#include <sys/time.h>                   // for gettimeofday
#include <sys/types.h>                  // for pid_t
#include <unistd.h>                     // for getpid
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>               // definition of 'struct rusage'
#endif

/****************************************************************************
**
** Overview of GAP profiling
**
** The basic idea behind profiling comes in two parts:
**
** 1) In each stat and expr, we store at creation time a filenameid and a
**    line number. This is always done (as it isn't very expensive)
**
** 2) When we want to profile, we wrap each of
**      - ExecStatFuncs
**      - ExecExprFuncs
**      - EvalBoolFuncs
**    and output the line number of filename we stored in the stat or expr.
**    We also use 1 bit to mark that we have executed this statement, so
**    we can (if we want to) only output each executed statement once.
**
**  We use this information to output a straight list of every executed statement.
**
**  There are not that many tricky cases here. We have to be careful that
**  some Expr are integers or local variables, and not touch those.
**
**  Limitations (and how we overcome them):
**
**  There are three main limitations to this approach (2 of which we handle)
**
**  1) From our initial trace, we don't know if a line has a statement on
**     it to be executed! Therefore we also provide the ability to store the
**     line of each created statement, so we can check which lines have code
**     on them.
**
**  2) If we wait until the user can run HookedLine, they have missed
**     the reading and execution of lots of the standard library. Therefore
**     we provide -P (profiling) and -c (code coverage) options to the GAP
**     executable so the user can start before code loading starts
**
**  3) Operating at just a line basis can sometimes be too coarse. However,
**     without some serious additional overheads, I can't see how to provide this
**     functionality in output (basically we would have to store
**     line and character positions for the start and end of every expression).
**
**
**  Achieving 100% code coverage is a little tricky. Here is a list of
**  the special cases which had to be considered (so far)
**
**  GAP special cases for-loops of the form 'for i in [a..b]', by digging
**  into the range to extract 'a' and 'b'. Therefore nothing on the line is
**  ever evaluated and it appears to never be executed. We special case this
**  if ForRange, by marking the range as evaluated.
**
**  We purposefully ignore EXPR_TRUE and EXPR_FALSE, which represent the
**  constants 'true' and 'false', as they are often read but not 'executed'.
**  We already ignored all integer and float constants anyway.
**  However, the main reason this was added is that GAP represents 'else'
**  as 'elif true then', and this was leading to 'else' statements being
**  never marked as executed.
*/

/****************************************************************************
**
** Store the current state of the profiler
*/

static Obj OutputtedFilenameList;

struct StatementLocation
{
    int fileid;
    int line;
};

typedef enum { Tick_WallTime, Tick_CPUTime, Tick_Mem } TickMethod;

typedef enum { Profile_Disabled = 0, Profile_Active = 1, Profile_Paused = 2} ProfileActiveEnum;

static struct ProfileState
{
  // Is profiling currently active
  ProfileActiveEnum status;
  // C steam we are writing to
  FILE* Stream;
  // Filename we are writing to
  char filename[GAP_PATH_MAX];
  // Did we use 'popen' to open the stream (matters when closing)
  int StreamWasPopened;
  // Are we currently outputting repeats (false=code coverage)
  int OutputRepeats;

  // Used to generate 'X' statements, to make sure we correctly
  // attach each function call to the line it was executed on
  struct StatementLocation lastNotOutputted;

  // Record last executed statement, to avoid repeats
  struct StatementLocation lastOutputted;
  int lastOutputtedExec;

  Int8 lastOutputtedTime;

  TickMethod tickMethod;

  int minimumProfileTick;
#ifdef HPCGAP
  int profiledThread;
#endif

  // Have we previously profiled this execution of GAP? We need this because
  // code coverage doesn't work more than once, as we use a bit in each Stat
  // to mark if we previously executed this statement, which we can't
  // clear
  UInt profiledPreviously;

  Int LongJmpOccurred;

  // We store the value of RecursionDepth each time we enter a function.
  // This is the only way to detect if GAP has left a function by performing
  // a longjmp.
  // We need to store the actual values, as RecursionDepth can increase
  // by more than one when a GAP function is called
  Obj visitedDepths;
} profileState;

// Some GAP functionality (such as syntaxtree) evaluates expressions, which makes
// them appear executed in profiles. The functions pauseProfiling and unpauseProfiling
// temporarily enable and disable profiling to avoid this problem.
void pauseProfiling(void)
{
    if (profileState.status == Profile_Active) {
        profileState.status = Profile_Paused;
    }
}

void unpauseProfiling(void)
{
    if (profileState.status == Profile_Paused) {
        profileState.status = Profile_Active;
    }
}

// Output information about how this profile was configured
static void outputVersionInfo(void)
{
    const char timeTypeNames[3][10] = { "WallTime", "CPUTime", "Memory" };
    fprintf(profileState.Stream,
            "{ \"Type\": \"_\", \"Version\":1, \"IsCover\": %s, "
            " \"TimeType\": \"%s\"}\n",
            profileState.OutputRepeats ? "false" : "true",
            timeTypeNames[profileState.tickMethod]);
    // Explicitly flush, so this information is in the file
    // even if GAP crashes
    fflush(profileState.Stream);
}

static void ProfileRegisterLongJmpOccurred(int depth)
{
    profileState.LongJmpOccurred = 1;
}

// This function is called when we detect a longjmp occurred, and
// outputs a 'return' into the profile for any function which was
// jumped over.
// It is fine for this function to be called when a longjmp has not
// occurred, or when no function was longjmped over.
static void CheckLeaveFunctionsAfterLongjmp(void)
{
    if (!profileState.LongJmpOccurred)
        return;

#ifdef HPCGAP
    if (profileState.profiledThread != TLS(threadID))
        return;
#endif

    profileState.LongJmpOccurred = 0;

    Int pos = LEN_PLIST(profileState.visitedDepths);
    Int depth = GetRecursionDepth();

    while (pos > 0 && INT_INTOBJ(ELM_PLIST(profileState.visitedDepths, pos)) > depth) {
        // Give dummy values if we do not know
        fprintf(profileState.Stream,
                "{\"Type\":\"O\",\"Fun\":\"nameless\",\"Line\":-1,"
                "\"EndLine\":-1,\"File\":\"<missing filename>\","
                "\"FileId\":-1}\n");
        PopPlist(profileState.visitedDepths);
        pos--;
    }
}

// Escape a string for serialization in a JSON file, following the
// escaping rules laid out at json.org.
static Obj JsonEscapeString(Obj param)
{
    Int lenString = LEN_LIST(param);

    // Allocate an output string with twice the size of the input
    // string, as in the worst case every single has to be escaped.
    Obj     copy = NEW_STRING(lenString * 2);
    UChar * in = CHARS_STRING(param);
    UChar * base = CHARS_STRING(copy);
    UChar * out = base;

    for (Int i = 0; i < lenString; ++i) {
        UChar u = in[i];
        switch (u) {
        case '\\':
        case '"':
        case '/':
            out[0] = '\\';
            out[1] = u;
            out += 2;
            break;
#define ESCAPE_CASE(x, y)                                                    \
    case x:                                                                  \
        out[0] = '\\';                                                       \
        out[1] = y;                                                          \
        out += 2;                                                            \
        break;
            ESCAPE_CASE('\b', 'b');
            ESCAPE_CASE('\t', 't');
            ESCAPE_CASE('\n', 'n');
            ESCAPE_CASE('\f', 'f');
            ESCAPE_CASE('\r', 'r');
#undef ESCAPE_CASE
        default:
            *(out++) = u;
        }
    }

    SET_LEN_STRING(copy, out - base);
    ResizeBag(copy, SIZEBAG_STRINGLEN(out - base));
    return copy;
}

static inline void outputFilenameIdIfRequired(UInt id)
{
    if (id == 0) {
        return;
    }
    if (LEN_PLIST(OutputtedFilenameList) < id ||
        ELM_PLIST(OutputtedFilenameList, id) != True) {
        AssPlist(OutputtedFilenameList, id, True);
        fprintf(profileState.Stream,
                "{\"Type\":\"S\",\"File\":\"%s\",\"FileId\":%d}\n",
                CONST_CSTR_STRING(JsonEscapeString(GetCachedFilename(id))),
                (int)id);
    }
}

// This function checks gets the filenameId of the current function.
static inline UInt getFilenameIdOfCurrentFunction(void)
{
    Obj func = CURR_FUNC();
    Obj body = BODY_FUNC(func);
    return GET_GAPNAMEID_BODY(body);
}

static void HookedLineOutput(Obj func, char type)
{
  HashLock(&profileState);
  if (profileState.status == Profile_Active && profileState.OutputRepeats)
  {
    Obj body = BODY_FUNC(func);
    UInt startline = GET_STARTLINE_BODY(body);
    UInt endline = GET_ENDLINE_BODY(body);

    Obj name = NAME_FUNC(func);
    if (name) {
        name = JsonEscapeString(name);
    }

    Obj         filename = GET_FILENAME_BODY(body);
    UInt        fileid = GET_GAPNAMEID_BODY(body);
    outputFilenameIdIfRequired(fileid);
    const Char *filename_c = "";
    if(filename != Fail && filename != NULL)
        filename_c = CONST_CSTR_STRING(JsonEscapeString(filename));

    // Do this here to avoid GCs before string is used
    const Char * name_c = name ? CONST_CSTR_STRING(name) : "nameless";

    if(type == 'I' && profileState.lastNotOutputted.line != -1)
    {
      fprintf(profileState.Stream, "{\"Type\":\"X\",\"Line\":%d,\"FileId\":%d}\n",
              (int)profileState.lastNotOutputted.line,
              (int)profileState.lastNotOutputted.fileid);
    }

    // We output 'File' here for compatibility with
    // profiling v1.3.0 and earlier, FileId provides the same information
    // in a more useful and compact form.
    fprintf(profileState.Stream, "{\"Type\":\"%c\",\"Fun\":\"%s\",\"Line\":%"
                                 "d,\"EndLine\":%d,\"File\":\"%s\","
                                 "\"FileId\":%d}\n",
            type, name_c, (int)startline, (int)endline, filename_c,
            (int)fileid);
  }
  HashUnlock(&profileState);
}

static void enterFunction(Obj func)
{
#ifdef HPCGAP
    if (profileState.profiledThread != TLS(threadID))
      return;
#endif
    CheckLeaveFunctionsAfterLongjmp();
    PushPlist(profileState.visitedDepths, INTOBJ_INT(GetRecursionDepth()));
    HookedLineOutput(func, 'I');
}

static void leaveFunction(Obj func)
{
#ifdef HPCGAP
    if (profileState.profiledThread != TLS(threadID))
      return;
#endif
    // Do not crash if we exit the function in which
    // Profile was originally called. The profiling
    // package can handle such profiles.
    if (LEN_PLIST(profileState.visitedDepths) > 0) {
        PopPlist(profileState.visitedDepths);
    }
    CheckLeaveFunctionsAfterLongjmp();

    HookedLineOutput(func, 'O');
}

/****************************************************************************
**
** Functionality to store streams compressed.
** If we could rely on the existence of the IO package, we would use that here.
** however, we want to be able to start compressing files right at the start
** of GAP's execution, before anything else is done.
*/

static BOOL endsWithgz(const char * s)
{
  s = strrchr(s, '.');
  return s && streq(s, ".gz");
}

static void fopenMaybeCompressed(const char* name, struct ProfileState* ps)
{
#ifdef HAVE_POPEN
  char popen_buf[4096];
  // Need space for "gzip < '", ".gz'" and terminating \0.
  if(endsWithgz(name) && strlen(name) < sizeof(popen_buf) - 8 - 4 - 1)
  {
    strxcpy(popen_buf, "gzip > '", sizeof(popen_buf));
    strxcat(popen_buf, name, sizeof(popen_buf));
    strxcat(popen_buf, "'", sizeof(popen_buf));
    ps->Stream = popen(popen_buf, "w");
    ps->StreamWasPopened = 1;
    return;
  }
#endif

  ps->Stream = fopen(name, "w");
  ps->StreamWasPopened = 0;
}

static void fcloseMaybeCompressed(struct ProfileState* ps)
{
#ifdef HAVE_POPEN
  if(ps->StreamWasPopened)
  {
    pclose(ps->Stream);
    ps->Stream = 0;
    return;
  }
#endif
  fclose(ps->Stream);
  ps->Stream = 0;
}

// When a child is forked off, we force profile information to be stored
// in a new file for the child, to avoid corruption
void InformProfilingThatThisIsAForkedGAP(void)
{
    HashLock(&profileState);
    if (profileState.status == Profile_Active) {
        char filenamecpy[GAP_PATH_MAX];
        // Allow 20 characters to allow space for .%d.gz
        const int SUPPORTED_PATH_LEN = GAP_PATH_MAX - 20;
        if(strlen(profileState.filename) > SUPPORTED_PATH_LEN) {
           Panic("Filename can be at most %d character when forking", SUPPORTED_PATH_LEN);
        }
        if (endsWithgz(profileState.filename)) {
            snprintf(filenamecpy, sizeof(filenamecpy), "%.*s.%d.gz",
                     SUPPORTED_PATH_LEN, profileState.filename, getpid());
        }
        else {
            snprintf(filenamecpy, sizeof(filenamecpy), "%.*s.%d",
                     SUPPORTED_PATH_LEN, (char*)profileState.filename, getpid());
        }
        fcloseMaybeCompressed(&profileState);
        fopenMaybeCompressed(filenamecpy, &profileState);
        outputVersionInfo();
        // Need to flush list of outputted files, as we will start a fresh file
        OutputtedFilenameList = NEW_PLIST(T_PLIST, 0);
    }
    HashUnlock(&profileState);
}

static inline Int8 CPUmicroseconds(void)
{
#ifdef HAVE_GETRUSAGE
  struct rusage buf;

  getrusage( RUSAGE_SELF, &buf );

  return (Int8)buf.ru_utime.tv_sec * 1000000 + (Int8)buf.ru_utime.tv_usec;
#else
  // Should never get here!
  abort();
#endif
}

static inline Int8 getTicks(void)
{
    switch (profileState.tickMethod) {
    case Tick_CPUTime:
        return CPUmicroseconds();
    case Tick_WallTime:
        return SyNanosecondsSinceEpoch() / 1000;
    case Tick_Mem:
        return SizeAllBags;
    default:
        return 0;
    }
}

static inline void printOutput(int fileid, int line, BOOL exec, BOOL visited)
{
    if (profileState.lastOutputted.line != line ||
        profileState.lastOutputted.fileid != fileid ||
        profileState.lastOutputtedExec != exec) {

        if (profileState.OutputRepeats) {
            Int newticks = getTicks();

            Int ticks = newticks - profileState.lastOutputtedTime;

            // Basic sanity check
            if (ticks < 0)
                ticks = 0;
            if ((profileState.minimumProfileTick == 0) ||
                (ticks > profileState.minimumProfileTick) || (!visited)) {
                int ticksDone;
                if (profileState.minimumProfileTick == 0) {
                    ticksDone = ticks;
                }
                else {
                    ticksDone = (ticks / profileState.minimumProfileTick) *
                                profileState.minimumProfileTick;
                }
                outputFilenameIdIfRequired(fileid);
                fprintf(profileState.Stream,
                        "{\"Type\":\"%c\",\"Ticks\":%d,\"Line\":%d,"
                        "\"FileId\":%d}\n",
                        exec ? 'E' : 'R', ticksDone, (int)line, (int)fileid);
                profileState.lastOutputtedTime = newticks;
                profileState.lastNotOutputted.line = -1;
                profileState.lastOutputted.line = line;
                profileState.lastOutputted.fileid = fileid;
                profileState.lastOutputtedExec = exec;
            }
            else {
                profileState.lastNotOutputted.line = line;
                profileState.lastNotOutputted.fileid = fileid;
            }
        }
        else {
            outputFilenameIdIfRequired(fileid);
            fprintf(profileState.Stream,
                    "{\"Type\":\"%c\",\"Line\":%d,\"FileId\":%d}\n",
                    exec ? 'E' : 'R', (int)line, (int)fileid);
            profileState.lastOutputted.line = line;
            profileState.lastOutputted.fileid = fileid;
            profileState.lastOutputtedExec = exec;
            profileState.lastNotOutputted.line = -1;
        }
    }
}

// type : the type of the statement
// exec : are we executing this statement
// visit: Was this statement previously visited (that is, executed)
static inline void
outputStat(Int fileid, int line, int type, BOOL exec, BOOL visited)
{
    // Explicitly skip these two cases, as they are often specially handled
    // and also aren't really interesting statements (something else will
    // be executed whenever they are).
    if (type == EXPR_TRUE || type == EXPR_FALSE) {
        return;
    }

    CheckLeaveFunctionsAfterLongjmp();

    // Catch the case we arrive here and profiling is already disabled
    if (profileState.status != Profile_Active) {
        return;
    }

    outputFilenameIdIfRequired(fileid);

    // Statement not attached to a file
    if (fileid == 0) {
        return;
    }

    printOutput(fileid, line, exec, visited);
}

static inline void outputInterpretedStat(int fileid, int line, BOOL exec)
{
    CheckLeaveFunctionsAfterLongjmp();

    // Catch the case we arrive here and profiling is already disabled
    if (profileState.status != Profile_Active) {
        return;
    }

    outputFilenameIdIfRequired(fileid);

    // Statement not attached to a file
    if (fileid == 0) {
        return;
    }

    printOutput(fileid, line, exec, 0);
}

static void visitStat(Stat stat)
{
#ifdef HPCGAP
  if (profileState.profiledThread != TLS(threadID))
    return;
#endif

  BOOL visited = VISITED_STAT(stat);

  if (!visited) {
    SET_VISITED_STAT(stat);
  }

  if (profileState.OutputRepeats || !visited) {
    HashLock(&profileState);
    outputStat(getFilenameIdOfCurrentFunction(), LINE_STAT(stat),
               TNUM_STAT(stat), TRUE, visited);
    HashUnlock(&profileState);
  }
}

static void visitInterpretedStat(int fileid, int line)
{
#ifdef HPCGAP
    if (profileState.profiledThread != TLS(threadID))
        return;
#endif

    HashLock(&profileState);
    outputInterpretedStat(fileid, line, TRUE);
    HashUnlock(&profileState);
}

/****************************************************************************
**
** This function exists to help with code coverage -- this outputs which
** lines have statements on expressions on them, so later we can
** check we executed something on those lines!
**/

static void registerStat(int fileid, int line, int type)
{
    HashLock(&profileState);
    if (profileState.status == Profile_Active) {
        outputStat(fileid, line, type, FALSE, FALSE);
    }
    HashUnlock(&profileState);
}

static void registerInterpretedStat(int fileid, int line)
{
    HashLock(&profileState);
    if (profileState.status == Profile_Active) {
        outputInterpretedStat(fileid, line, FALSE);
    }
    HashUnlock(&profileState);
}

static struct InterpreterHooks profileHooks = { visitStat,
                                         visitInterpretedStat,
                                         enterFunction,
                                         leaveFunction,
                                         registerStat,
                                         registerInterpretedStat,
                                         "line-by-line profiling" };

static void
enableAtStartup(const char * filename, Int repeats, TickMethod tickMethod)
{
    if (profileState.status == Profile_Active) {
        Panic("-P or -C can only be passed once\n");
    }

    profileState.OutputRepeats = repeats;

    fopenMaybeCompressed(filename, &profileState);
    if(!profileState.Stream) {
        Panic("Failed to open '%s' for profiling output.\n", filename);
    }

    gap_strlcpy(profileState.filename, filename, GAP_PATH_MAX);

    ActivateHooks(&profileHooks);

    profileState.status = Profile_Active;
    RegisterThrowObserver(ProfileRegisterLongJmpOccurred);
    profileState.profiledPreviously = 1;
#ifdef HPCGAP
    profileState.profiledThread = TLS(threadID);
#endif
    profileState.tickMethod = tickMethod;
    profileState.lastNotOutputted.line = -1;
    profileState.lastOutputtedTime = getTicks();

    outputVersionInfo();
}

// This function is for when GAP is started with -c, and
// enables profiling at startup. If anything goes wrong,
// we quit straight away.
int enableCodeCoverageAtStartup(const char * argv[], void * dummy)
{
    enableAtStartup(argv[0], 0, Tick_Mem);
    return 1;
}

// This function is for when GAP is started with -P, and
// enables profiling at startup. If anything goes wrong,
// we quit straight away.
int enableProfilingAtStartup(const char * argv[], void * dummy)
{
    TickMethod tickMethod = Tick_WallTime;
#ifdef HAVE_GETTIMEOFDAY
    tickMethod = Tick_WallTime;
#else
#ifdef HAVE_GETRUSAGE
    tickMethod = Tick_CPUTime;
#endif
#endif
    enableAtStartup(argv[0], 1, tickMethod);
    return 1;
}

int enableMemoryProfilingAtStartup(const char * argv[], void * dummy)
{
    enableAtStartup(argv[0], 1, Tick_Mem);
    return 1;
}

static Obj FuncACTIVATE_PROFILING(Obj self,
                                  Obj filename, // filename to write to
                                  Obj coverage,
                                  Obj wallTime,
                                  Obj recordMem,
                                  Obj resolution)
{
    if (profileState.status != Profile_Disabled) {
      return Fail;
    }

    if(profileState.profiledPreviously &&
       coverage == True) {
        ErrorMayQuit("Code coverage can only be started once per"
                     " GAP session. Please exit GAP and restart. Sorry.",0,0);
    }

    memset(&profileState, 0, sizeof(profileState));

    OutputtedFilenameList = NEW_PLIST(T_PLIST, 0);
    profileState.visitedDepths = NEW_PLIST(T_PLIST, 0);

    RequireStringRep(SELF_NAME, filename);

    if(coverage != True && coverage != False) {
      ErrorMayQuit(" must be a boolean",0,0);
    }

    if(wallTime != True && wallTime != False) {
      ErrorMayQuit(" must be a boolean",0,0);
    }

#ifndef HAVE_GETTIMEOFDAY
    if(wallTime == True) {
        ErrorMayQuit("This OS does not support wall-clock based timing",0,0);
    }
#endif
#ifndef HAVE_GETRUSAGE
    if(wallTime == False) {
        ErrorMayQuit("This OS does not support CPU based timing",0,0);
    }
#endif

    if (recordMem == True) {
        profileState.tickMethod = Tick_Mem;
    }
    else {
        profileState.tickMethod =
            (wallTime == True) ? Tick_WallTime : Tick_CPUTime;
    }

    profileState.lastOutputtedTime = getTicks();

    RequireNonnegativeSmallInt(SELF_NAME, resolution);

    HashLock(&profileState);

    // Recheck inside lock
    if (profileState.status == Profile_Active) {
      HashUnlock(&profileState);
      return Fail;
    }
    int tick = INT_INTOBJ(resolution);
    profileState.minimumProfileTick = tick;

    if(coverage == True) {
      profileState.OutputRepeats = 0;
    }
    else {
      profileState.OutputRepeats = 1;
    }

    fopenMaybeCompressed(CONST_CSTR_STRING(filename), &profileState);

    gap_strlcpy(profileState.filename, CONST_CSTR_STRING(filename), GAP_PATH_MAX);

    if(profileState.Stream == 0) {
      HashUnlock(&profileState);
      return Fail;
    }

    profileState.status = Profile_Active;
    RegisterThrowObserver(ProfileRegisterLongJmpOccurred);
    profileState.profiledPreviously = 1;
#ifdef HPCGAP
    profileState.profiledThread = TLS(threadID);
#endif
    profileState.lastNotOutputted.line = -1;

    outputVersionInfo();
    HashUnlock(&profileState);

    // This must be after the hash unlock, as it also takes a lock
    ActivateHooks(&profileHooks);

    return True;
}

static Obj FuncDEACTIVATE_PROFILING(Obj self)
{
  HashLock(&profileState);

  if (profileState.status == Profile_Disabled) {
    HashUnlock(&profileState);
    return Fail;
  }

  fcloseMaybeCompressed(&profileState);
  profileState.status = Profile_Disabled;
  HashUnlock(&profileState);

  // This must be after the hash unlock, as it also takes a lock
  DeactivateHooks(&profileHooks);

  return True;
}

static Obj FuncIsLineByLineProfileActive(Obj self)
{
  if (profileState.status == Profile_Active) {
    return True;
  } else {
    return False;
  }
}

/****************************************************************************
**
*F * * * * * * * * * * * * * initialize module * * * * * * * * * * * * * * *
*/

/****************************************************************************
**
*V  GVarFuncs . . . . . . . . . . . . . . . . . . list of functions to export
*/
static StructGVarFunc GVarFuncs[] = {

    GVAR_FUNC_5ARGS(ACTIVATE_PROFILING,
                    filename,
                    coverage,
                    wallTime,
                    recordMem,
                    resolution),
    GVAR_FUNC_0ARGS(DEACTIVATE_PROFILING),
    GVAR_FUNC_0ARGS(IsLineByLineProfileActive),
    { 0, 0, 0, 0, 0 }
};

/****************************************************************************
**
*F  InitLibrary( <module> ) . . . . . . .  initialise library data structures
*/
static Int InitLibrary (
    StructInitInfo *    module )
{
    // init filters and functions
    InitGVarFuncsFromTable( GVarFuncs );

    profileState.visitedDepths = NEW_PLIST(T_PLIST, 0);
    OutputtedFilenameList = NEW_PLIST(T_PLIST, 0);
    return 0;
}

/****************************************************************************
**
*F  InitKernel( <module> )  . . . . . . . . initialise kernel data structures
*/
static Int InitKernel (
    StructInitInfo *    module )
{
    InitHdlrFuncsFromTable( GVarFuncs );
    InitGlobalBag(&OutputtedFilenameList, "src/profile.c:OutputtedFileList");
    InitGlobalBag(&profileState.visitedDepths, "src/profile.c:visitedDepths");
    return 0;
}

static Int PostRestore ( StructInitInfo * module )
{
    /* When we restore a workspace, we start a new profile.
     * 'OutputtedFilenameList' is the only part of the profile which is
     * stored in the GAP memory space, so we need to clear it in case
     * it still has a value from a previous profile.
     */
    OutputtedFilenameList = NEW_PLIST(T_PLIST, 0);
    return 0;
}

/****************************************************************************
**
*F  InitInfoStats() . . . . . . . . . . . . . . . . . table of init functions
*/
static StructInitInfo module = {
    // init struct using C99 designated initializers; for a full list of
    // fields, please refer to the definition of StructInitInfo
    .type = MODULE_BUILTIN,
    .name = "profile",
    .initKernel = InitKernel,
    .initLibrary = InitLibrary,
    .postRestore = PostRestore
};

StructInitInfo * InitInfoProfile ( void )
{
    return &module;
}

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