/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is SpiderMonkey JavaScript engine.
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 * The Initial Developer of the Original Code is
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 *
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#ifndef jsgc_statistics_h___
#define jsgc_statistics_h___

#include <string.h>

#include "jsfriendapi.h"
#include "jspubtd.h"
#include "jsutil.h"

struct JSCompartment;

namespace js {
namespace gcstats {

enum Phase {
    PHASE_MARK,
    PHASE_MARK_ROOTS,
    PHASE_MARK_DELAYED,
    PHASE_MARK_OTHER,
    PHASE_SWEEP,
    PHASE_SWEEP_OBJECT,
    PHASE_SWEEP_STRING,
    PHASE_SWEEP_SCRIPT,
    PHASE_SWEEP_SHAPE,
    PHASE_DISCARD_CODE,
    PHASE_DISCARD_ANALYSIS,
    PHASE_XPCONNECT,
    PHASE_DESTROY,

    PHASE_LIMIT
};

enum Stat {
    STAT_NEW_CHUNK,
    STAT_DESTROY_CHUNK,

    STAT_LIMIT
};

static const size_t BUFFER_SIZE = 8192;

struct Statistics {
    Statistics(JSRuntime *rt);
    ~Statistics();

    void beginPhase(Phase phase);
    void endPhase(Phase phase);

    void beginSlice(JSCompartment *comp, gcreason::Reason reason);
    void endSlice();

    void reset(const char *reason) { slices.back().resetReason = reason; }
    void nonincremental(const char *reason) { nonincrementalReason = reason; }

    void count(Stat s) {
        JS_ASSERT(s < STAT_LIMIT);
        counts[s]++;
    }

  private:
    JSRuntime *runtime;

    int64_t startupTime;

    FILE *fp;
    bool fullFormat;

    JSCompartment *compartment;
    const char *nonincrementalReason;

    struct SliceData {
        SliceData(gcreason::Reason reason, int64_t start)
          : reason(reason), resetReason(NULL), start(start)
        {
            PodArrayZero(phaseTimes);
        }

        gcreason::Reason reason;
        const char *resetReason;
        int64_t start, end;
        int64_t phaseTimes[PHASE_LIMIT];

        int64_t duration() const { return end - start; }
    };

    Vector<SliceData, 8, SystemAllocPolicy> slices;

    /* Most recent time when the given phase started. */
    int64_t phaseStarts[PHASE_LIMIT];

    /* Total time in a given phase for this GC. */
    int64_t phaseTimes[PHASE_LIMIT];

    /* Total time in a given phase over all GCs. */
    int64_t phaseTotals[PHASE_LIMIT];

    /* Number of events of this type for this GC. */
    unsigned int counts[STAT_LIMIT];

    char buffer[BUFFER_SIZE];
    bool needComma;

    void beginGC();
    void endGC();

    int64_t gcDuration();
    double t(int64_t t);
    void printStats();
    void fmt(const char *f, ...);
    void fmtIfNonzero(const char *name, double t);
    void formatPhases(int64_t *times);
    const char *formatData();

    double computeMMU(int64_t resolution);
};

struct AutoGCSlice {
    AutoGCSlice(Statistics &stats, JSCompartment *comp, gcreason::Reason reason
                JS_GUARD_OBJECT_NOTIFIER_PARAM)
      : stats(stats) { JS_GUARD_OBJECT_NOTIFIER_INIT; stats.beginSlice(comp, reason); }
    ~AutoGCSlice() { stats.endSlice(); }

    Statistics &stats;
    JS_DECL_USE_GUARD_OBJECT_NOTIFIER
};

struct AutoPhase {
    AutoPhase(Statistics &stats, Phase phase JS_GUARD_OBJECT_NOTIFIER_PARAM)
      : stats(stats), phase(phase) { JS_GUARD_OBJECT_NOTIFIER_INIT; stats.beginPhase(phase); }
    ~AutoPhase() { stats.endPhase(phase); }

    Statistics &stats;
    Phase phase;
    JS_DECL_USE_GUARD_OBJECT_NOTIFIER
};

} /* namespace gcstats */
} /* namespace js */

#endif /* jsgc_statistics_h___ */