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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 2008-2009
*
* Support for fast binary event logging and user-space dtrace probes.
*
* ---------------------------------------------------------------------------*/

#ifndef TRACE_H
#define TRACE_H

#include "rts/EventLogFormat.h"
#include "Capability.h"

#if defined(DTRACE)
#include "RtsProbes.h"
#endif /* defined(DTRACE) */

#include "BeginPrivate.h"

// -----------------------------------------------------------------------------
// EventLog API
// -----------------------------------------------------------------------------

#if defined(TRACING)

void initTracing (void);
void endTracing (void);
void freeTracing (void);
void resetTracing (void);
void tracingAddCapapilities (nat from, nat to);

#endif /* TRACING */

typedef StgWord32 CapsetID;
typedef StgWord16 CapsetType;
enum CapsetType { CapsetTypeCustom = CAPSET_TYPE_CUSTOM,
                  CapsetTypeOsProcess = CAPSET_TYPE_OSPROCESS,
                  CapsetTypeClockdomain = CAPSET_TYPE_CLOCKDOMAIN };
#define CAPSET_OSPROCESS_DEFAULT 0
#define CAPSET_CLOCKDOMAIN_DEFAULT 1

// -----------------------------------------------------------------------------
// Message classes
// -----------------------------------------------------------------------------

// debugging flags, set with +RTS -D<something>
extern int DEBUG_sched;
extern int DEBUG_interp;
extern int DEBUG_weak;
extern int DEBUG_gccafs;
extern int DEBUG_gc;
extern int DEBUG_block_alloc;
extern int DEBUG_sanity;
extern int DEBUG_stable;
extern int DEBUG_stm;
extern int DEBUG_prof;
extern int DEBUG_gran;
extern int DEBUG_par;
extern int DEBUG_linker;
extern int DEBUG_squeeze;
extern int DEBUG_hpc;
extern int DEBUG_sparks;

// events
extern int TRACE_sched;
extern int TRACE_gc;
extern int TRACE_spark_sampled;
extern int TRACE_spark_full;
/* extern int TRACE_user; */ // only used in Trace.c

// -----------------------------------------------------------------------------
// Posting events
//
// We use macros rather than inline functions deliberately. We want
// the not-taken case to be as efficient as possible, a simple
// test-and-jump, and with inline functions gcc seemed to move some of
// the instructions from the branch up before the test.
//
// -----------------------------------------------------------------------------

#ifdef DEBUG
void traceBegin (const char *str, ...);
void traceEnd (void);
#endif

#ifdef TRACING

/*
* Record a scheduler event
*/
#define traceSchedEvent(cap, tag, tso, other) \
if (RTS_UNLIKELY(TRACE_sched)) { \
traceSchedEvent_(cap, tag, tso, other, 0); \
}

#define traceSchedEvent2(cap, tag, tso, info1, info2) \
if (RTS_UNLIKELY(TRACE_sched)) { \
traceSchedEvent_(cap, tag, tso, info1, info2); \
}

void traceSchedEvent_ (Capability *cap, EventTypeNum tag,
                       StgTSO *tso, StgWord info1, StgWord info2);

/*
* Record a GC event
*/
#define traceGcEvent(cap, tag) \
if (RTS_UNLIKELY(TRACE_gc)) { \
traceGcEvent_(cap, tag); \
}

void traceGcEvent_ (Capability *cap, EventTypeNum tag);

/*
* Record a spark event
*/
#define traceSparkEvent(cap, tag) \
if (RTS_UNLIKELY(TRACE_spark_full)) { \
traceSparkEvent_(cap, tag, 0); \
}

#define traceSparkEvent2(cap, tag, other) \
if (RTS_UNLIKELY(TRACE_spark_full)) { \
traceSparkEvent_(cap, tag, other); \
}

void traceSparkEvent_ (Capability *cap, EventTypeNum tag, StgWord info1);

// variadic macros are C99, and supported by gcc. However, the
// ##__VA_ARGS syntax is a gcc extension, which allows the variable
// argument list to be empty (see gcc docs for details).

/*
* Emit a trace message on a particular Capability
*/
#define traceCap(class, cap, msg, ...) \
if (RTS_UNLIKELY(class)) { \
traceCap_(cap, msg, ##__VA_ARGS__); \
}

void traceCap_(Capability *cap, char *msg, ...);

/*
* Emit a trace message
*/
#define trace(class, msg, ...) \
if (RTS_UNLIKELY(class)) { \
trace_(msg, ##__VA_ARGS__); \
}

void trace_(char *msg, ...);

/*
* A message or event emitted by the program
* Used by Debug.Trace.{traceEvent, traceEventIO}
*/
void traceUserMsg(Capability *cap, char *msg);

/*
* An event to record a Haskell thread's label/name
* Used by GHC.Conc.labelThread
*/
void traceThreadLabel_(Capability *cap,
                       StgTSO *tso,
                       char *label);

/*
* Emit a debug message (only when DEBUG is defined)
*/
#ifdef DEBUG
#define debugTrace(class, msg, ...) \
if (RTS_UNLIKELY(class)) { \
trace_(msg, ##__VA_ARGS__); \
}
#else
#define debugTrace(class, str, ...) /* nothing */
#endif

#ifdef DEBUG
#define debugTraceCap(class, cap, msg, ...) \
if (RTS_UNLIKELY(class)) { \
traceCap_(cap, msg, ##__VA_ARGS__); \
}
#else
#define debugTraceCap(class, cap, str, ...) /* nothing */
#endif

/*
* Emit a message/event describing the state of a thread
*/
#define traceThreadStatus(class, tso) \
if (RTS_UNLIKELY(class)) { \
traceThreadStatus_(tso); \
}

void traceThreadStatus_ (StgTSO *tso);

void traceEventStartup_ (int n_caps);

/*
* Events for describing capability sets in the eventlog
*
* Note: unlike other events, these are not conditional on TRACE_sched or
* similar because they are not "real" events themselves but provide
* information and context for other "real" events. Other events depend on
* the capset info events so for simplicity, rather than working out if
* they're necessary we always emit them. They should be very low volume.
*/
void traceCapsetEvent_ (EventTypeNum tag,
                        CapsetID capset,
                        StgWord info);

void traceWallClockTime_(void);

void traceOSProcessInfo_ (void);

void traceSparkCounters_ (Capability *cap,
                          SparkCounters counters,
                          StgWord remaining);

#else /* !TRACING */

#define traceSchedEvent(cap, tag, tso, other) /* nothing */
#define traceSchedEvent2(cap, tag, tso, other, info) /* nothing */
#define traceGcEvent(cap, tag) /* nothing */
#define traceSparkEvent(cap, tag) /* nothing */
#define traceSparkEvent2(cap, tag, other) /* nothing */
#define traceCap(class, cap, msg, ...) /* nothing */
#define trace(class, msg, ...) /* nothing */
#define debugTrace(class, str, ...) /* nothing */
#define debugTraceCap(class, cap, str, ...) /* nothing */
#define traceThreadStatus(class, tso) /* nothing */
#define traceThreadLabel_(cap, tso, label) /* nothing */
INLINE_HEADER void traceEventStartup_ (int n_caps STG_UNUSED) {};
#define traceCapsetEvent_(tag, capset, info) /* nothing */
#define traceWallClockTime_() /* nothing */
#define traceOSProcessInfo_() /* nothing */
#define traceSparkCounters_(cap, counters, remaining) /* nothing */

#endif /* TRACING */

// If DTRACE is enabled, but neither DEBUG nor TRACING, we need a C land
// wrapper for the user-msg probe (as we can't expand that in PrimOps.cmm)
//
#if !defined(DEBUG) && !defined(TRACING) && defined(DTRACE)

void dtraceUserMsgWrapper(Capability *cap, char *msg);

#endif /* !defined(DEBUG) && !defined(TRACING) && defined(DTRACE) */

// -----------------------------------------------------------------------------
// Aliases for static dtrace probes if dtrace is available
// -----------------------------------------------------------------------------

#if defined(DTRACE)

#define dtraceCreateThread(cap, tid) \
HASKELLEVENT_CREATE_THREAD(cap, tid)
#define dtraceRunThread(cap, tid) \
HASKELLEVENT_RUN_THREAD(cap, tid)
#define dtraceStopThread(cap, tid, status, info) \
HASKELLEVENT_STOP_THREAD(cap, tid, status, info)
#define dtraceThreadRunnable(cap, tid) \
HASKELLEVENT_THREAD_RUNNABLE(cap, tid)
#define dtraceMigrateThread(cap, tid, new_cap) \
HASKELLEVENT_MIGRATE_THREAD(cap, tid, new_cap)
#define dtraceShutdown(cap) \
HASKELLEVENT_SHUTDOWN(cap)
#define dtraceThreadWakeup(cap, tid, other_cap) \
HASKELLEVENT_THREAD_WAKEUP(cap, tid, other_cap)
#define dtraceGcStart(cap) \
HASKELLEVENT_GC_START(cap)
#define dtraceGcEnd(cap) \
HASKELLEVENT_GC_END(cap)
#define dtraceRequestSeqGc(cap) \
HASKELLEVENT_REQUEST_SEQ_GC(cap)
#define dtraceRequestParGc(cap) \
HASKELLEVENT_REQUEST_PAR_GC(cap)
#define dtraceCreateSparkThread(cap, spark_tid) \
HASKELLEVENT_CREATE_SPARK_THREAD(cap, spark_tid)
#define dtraceThreadLabel(cap, tso, label) \
HASKELLEVENT_THREAD_LABEL(cap, tso, label)
INLINE_HEADER void dtraceStartup (int num_caps) {
    HASKELLEVENT_STARTUP(num_caps);
}
#define dtraceUserMsg(cap, msg) \
HASKELLEVENT_USER_MSG(cap, msg)
#define dtraceGcIdle(cap) \
HASKELLEVENT_GC_IDLE(cap)
#define dtraceGcWork(cap) \
HASKELLEVENT_GC_WORK(cap)
#define dtraceGcDone(cap) \
HASKELLEVENT_GC_DONE(cap)
#define dtraceCapsetCreate(capset, capset_type) \
HASKELLEVENT_CAPSET_CREATE(capset, capset_type)
#define dtraceCapsetDelete(capset) \
HASKELLEVENT_CAPSET_DELETE(capset)
#define dtraceCapsetAssignCap(capset, capno) \
HASKELLEVENT_CAPSET_ASSIGN_CAP(capset, capno)
#define dtraceCapsetRemoveCap(capset, capno) \
HASKELLEVENT_CAPSET_REMOVE_CAP(capset, capno)
#define dtraceSparkCounters(cap, a, b, c, d, e, f, g) \
HASKELLEVENT_SPARK_COUNTERS(cap, a, b, c, d, e, f, g)
#define dtraceSparkCreate(cap) \
HASKELLEVENT_SPARK_CREATE(cap)
#define dtraceSparkDud(cap) \
HASKELLEVENT_SPARK_DUD(cap)
#define dtraceSparkOverflow(cap) \
HASKELLEVENT_SPARK_OVERFLOW(cap)
#define dtraceSparkRun(cap) \
HASKELLEVENT_SPARK_RUN(cap)
#define dtraceSparkSteal(cap, victim_cap) \
HASKELLEVENT_SPARK_STEAL(cap, victim_cap)
#define dtraceSparkFizzle(cap) \
HASKELLEVENT_SPARK_FIZZLE(cap)
#define dtraceSparkGc(cap) \
HASKELLEVENT_SPARK_GC(cap)

#else /* !defined(DTRACE) */

#define dtraceCreateThread(cap, tid) /* nothing */
#define dtraceRunThread(cap, tid) /* nothing */
#define dtraceStopThread(cap, tid, status, info) /* nothing */
#define dtraceThreadRunnable(cap, tid) /* nothing */
#define dtraceMigrateThread(cap, tid, new_cap) /* nothing */
#define dtraceShutdown(cap) /* nothing */
#define dtraceThreadWakeup(cap, tid, other_cap) /* nothing */
#define dtraceGcStart(cap) /* nothing */
#define dtraceGcEnd(cap) /* nothing */
#define dtraceRequestSeqGc(cap) /* nothing */
#define dtraceRequestParGc(cap) /* nothing */
#define dtraceCreateSparkThread(cap, spark_tid) /* nothing */
#define dtraceThreadLabel(cap, tso, label) /* nothing */
INLINE_HEADER void dtraceStartup (int num_caps STG_UNUSED) {};
#define dtraceUserMsg(cap, msg) /* nothing */
#define dtraceGcIdle(cap) /* nothing */
#define dtraceGcWork(cap) /* nothing */
#define dtraceGcDone(cap) /* nothing */
#define dtraceCapsetCreate(capset, capset_type) /* nothing */
#define dtraceCapsetDelete(capset) /* nothing */
#define dtraceCapsetAssignCap(capset, capno) /* nothing */
#define dtraceCapsetRemoveCap(capset, capno) /* nothing */
#define dtraceSparkCounters(cap, a, b, c, d, e, f, g) /* nothing */
#define dtraceSparkCreate(cap) /* nothing */
#define dtraceSparkDud(cap) /* nothing */
#define dtraceSparkOverflow(cap) /* nothing */
#define dtraceSparkRun(cap) /* nothing */
#define dtraceSparkSteal(cap, victim_cap) /* nothing */
#define dtraceSparkFizzle(cap) /* nothing */
#define dtraceSparkGc(cap) /* nothing */

#endif

// -----------------------------------------------------------------------------
// Trace probes dispatching to various tracing frameworks
//
// In order to avoid accumulating multiple calls to tracing calls at trace
// points, we define inline probe functions that contain the various
// invocations.
//
// Dtrace - dtrace probes are unconditionally added as probe activation is
// handled by the dtrace component of the kernel, and inactive probes are
// very cheap — usually, one no-op. Consequently, dtrace can be used with
// all flavours of the RTS. In addition, we still support logging events to
// a file, even in the presence of dtrace. This is, eg, useful when tracing
// on a server, but browsing trace information with ThreadScope on a local
// client.
//
// -----------------------------------------------------------------------------

INLINE_HEADER void traceEventCreateThread(Capability *cap STG_UNUSED,
                                          StgTSO *tso STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_CREATE_THREAD, tso, tso->stackobj->stack_size);
    dtraceCreateThread((EventCapNo)cap->no, (EventThreadID)tso->id);
}

INLINE_HEADER void traceEventRunThread(Capability *cap STG_UNUSED,
                                       StgTSO *tso STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_RUN_THREAD, tso, tso->what_next);
    dtraceRunThread((EventCapNo)cap->no, (EventThreadID)tso->id);
}

INLINE_HEADER void traceEventStopThread(Capability *cap STG_UNUSED,
                                        StgTSO *tso STG_UNUSED,
                                        StgThreadReturnCode status STG_UNUSED,
                                        StgWord32 info STG_UNUSED)
{
    traceSchedEvent2(cap, EVENT_STOP_THREAD, tso, status, info);
    dtraceStopThread((EventCapNo)cap->no, (EventThreadID)tso->id,
                     (EventThreadStatus)status, (EventThreadID)info);
}

// needs to be EXTERN_INLINE as it is used in another EXTERN_INLINE function
EXTERN_INLINE void traceEventThreadRunnable(Capability *cap STG_UNUSED,
                                            StgTSO *tso STG_UNUSED);

EXTERN_INLINE void traceEventThreadRunnable(Capability *cap STG_UNUSED,
                                            StgTSO *tso STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_THREAD_RUNNABLE, tso, 0);
    dtraceThreadRunnable((EventCapNo)cap->no, (EventThreadID)tso->id);
}

INLINE_HEADER void traceEventMigrateThread(Capability *cap STG_UNUSED,
                                           StgTSO *tso STG_UNUSED,
                                           nat new_cap STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_MIGRATE_THREAD, tso, new_cap);
    dtraceMigrateThread((EventCapNo)cap->no, (EventThreadID)tso->id,
                        (EventCapNo)new_cap);
}

INLINE_HEADER void traceEventShutdown(Capability *cap STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_SHUTDOWN, 0, 0);
    dtraceShutdown((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventThreadWakeup(Capability *cap STG_UNUSED,
                                          StgTSO *tso STG_UNUSED,
                                          nat other_cap STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_THREAD_WAKEUP, tso, other_cap);
    dtraceThreadWakeup((EventCapNo)cap->no, (EventThreadID)tso->id,
                       (EventCapNo)other_cap);
}

INLINE_HEADER void traceThreadLabel(Capability *cap STG_UNUSED,
                                    StgTSO *tso STG_UNUSED,
                                    char *label STG_UNUSED)
{
    if (RTS_UNLIKELY(TRACE_sched)) {
        traceThreadLabel_(cap, tso, label);
    }
    dtraceThreadLabel((EventCapNo)cap->no, (EventThreadID)tso->id, label);
}

INLINE_HEADER void traceEventGcStart(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_START);
    dtraceGcStart((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcEnd(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_END);
    dtraceGcEnd((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventRequestSeqGc(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_REQUEST_SEQ_GC);
    dtraceRequestSeqGc((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventRequestParGc(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_REQUEST_PAR_GC);
    dtraceRequestParGc((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcIdle(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_IDLE);
    dtraceGcIdle((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcWork(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_WORK);
    dtraceGcWork((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcDone(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_DONE);
    dtraceGcDone((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventStartup(void)
{
    int n_caps;
#ifdef THREADED_RTS
    // XXX n_capabilities hasn't been initialised yet
    n_caps = RtsFlags.ParFlags.nNodes;
#else
    n_caps = 1;
#endif

    traceEventStartup_(n_caps);
    dtraceStartup(n_caps);
}

INLINE_HEADER void traceCapsetCreate(CapsetID capset STG_UNUSED,
                                     CapsetType capset_type STG_UNUSED)
{
    traceCapsetEvent_(EVENT_CAPSET_CREATE, capset, capset_type);
    dtraceCapsetCreate(capset, capset_type);
}

INLINE_HEADER void traceCapsetDelete(CapsetID capset STG_UNUSED)
{
    traceCapsetEvent_(EVENT_CAPSET_DELETE, capset, 0);
    dtraceCapsetDelete(capset);
}

INLINE_HEADER void traceCapsetAssignCap(CapsetID capset STG_UNUSED,
                                        nat capno STG_UNUSED)
{
    traceCapsetEvent_(EVENT_CAPSET_ASSIGN_CAP, capset, capno);
    dtraceCapsetAssignCap(capset, capno);
}

INLINE_HEADER void traceCapsetRemoveCap(CapsetID capset STG_UNUSED,
                                        nat capno STG_UNUSED)
{
    traceCapsetEvent_(EVENT_CAPSET_REMOVE_CAP, capset, capno);
    dtraceCapsetRemoveCap(capset, capno);
}

INLINE_HEADER void traceWallClockTime(void)
{
    traceWallClockTime_();
    /* Note: no DTrace equivalent because it is available to DTrace directly */
}

INLINE_HEADER void traceOSProcessInfo(void)
{
    traceOSProcessInfo_();
    /* Note: no DTrace equivalent because all this OS process info
* is available to DTrace directly */
}

INLINE_HEADER void traceEventCreateSparkThread(Capability *cap STG_UNUSED,
                                               StgThreadID spark_tid STG_UNUSED)
{
    traceSparkEvent2(cap, EVENT_CREATE_SPARK_THREAD, spark_tid);
    dtraceCreateSparkThread((EventCapNo)cap->no, (EventThreadID)spark_tid);
}

INLINE_HEADER void traceSparkCounters(Capability *cap STG_UNUSED)
{
#ifdef THREADED_RTS
    if (RTS_UNLIKELY(TRACE_spark_sampled)) {
        traceSparkCounters_(cap, cap->spark_stats, sparkPoolSize(cap->sparks));
    }
    dtraceSparkCounters((EventCapNo)cap->no,
                        cap->spark_stats.created,
                        cap->spark_stats.dud,
                        cap->spark_stats.overflowed,
                        cap->spark_stats.converted,
                        cap->spark_stats.gcd,
                        cap->spark_stats.fizzled,
                        sparkPoolSize(cap->sparks));
#endif
}

INLINE_HEADER void traceEventSparkCreate(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_CREATE);
    dtraceSparkCreate((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkDud(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_DUD);
    dtraceSparkDud((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkOverflow(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_OVERFLOW);
    dtraceSparkOverflow((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkRun(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_RUN);
    dtraceSparkRun((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkSteal(Capability *cap STG_UNUSED,
                                        nat victim_cap STG_UNUSED)
{
    traceSparkEvent2(cap, EVENT_SPARK_STEAL, victim_cap);
    dtraceSparkSteal((EventCapNo)cap->no, (EventCapNo)victim_cap);
}

INLINE_HEADER void traceEventSparkFizzle(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_FIZZLE);
    dtraceSparkFizzle((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkGC(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_GC);
    dtraceSparkGc((EventCapNo)cap->no);
}

#include "EndPrivate.h"

#endif /* TRACE_H */
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