gem5/src/base/trace.hh

/*
 * Copyright (c) 2014, 2019, 2021 Arm Limited
 * All rights reserved
 *
 * Copyright (c) 2001-2006 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __BASE_TRACE_HH__
#define __BASE_TRACE_HH__

#include <ostream>
#include <string>
#include <sstream>

#include "base/compiler.hh"
#include "base/cprintf.hh"
#include "base/debug.hh"
#include "base/match.hh"
#include "base/types.hh"
#include "sim/cur_tick.hh"

// Return the global context name "global".  This function gets called when
// the DPRINTF macros are used in a context without a visible name() function
// @todo This should be moved to the gem5 namespace
const std::string &name();

namespace gem5
{

namespace Trace {

/** Debug logging base class.  Handles formatting and outputting
 *  time/name/message messages */
class Logger
{
  protected:
    /** Name match for objects to ignore */
    ObjectMatch ignore;

  public:
    /** Log a single message */
    template <typename ...Args>
    void dprintf(Tick when, const std::string &name, const char *fmt,
                 const Args &...args)
    {
        dprintf_flag(when, name, "", fmt, args...);
    }

    /** Log a single message with a flag prefix. */
    template <typename ...Args>
    void dprintf_flag(Tick when, const std::string &name,
            const std::string &flag,
            const char *fmt, const Args &...args)
    {
        if (!name.empty() && ignore.match(name))
            return;
        std::ostringstream line;
        ccprintf(line, fmt, args...);
        logMessage(when, name, flag, line.str());
    }

    /** Dump a block of data of length len */
    void dump(Tick when, const std::string &name,
            const void *d, int len, const std::string &flag);

    /** Log formatted message */
    virtual void logMessage(Tick when, const std::string &name,
            const std::string &flag, const std::string &message) = 0;

    /** Return an ostream that can be used to send messages to
     *  the 'same place' as formatted logMessage messages.  This
     *  can be implemented to use a logger's underlying ostream,
     *  to provide an ostream which formats the output in some
     *  way, or just set to one of std::cout, std::cerr */
    virtual std::ostream &getOstream() = 0;

    /** Set objects to ignore */
    void setIgnore(ObjectMatch &ignore_) { ignore = ignore_; }

    /** Add objects to ignore */
    void addIgnore(const ObjectMatch &ignore_) { ignore.add(ignore_); }

    virtual ~Logger() { }
};

/** Logging wrapper for ostreams with the format:
 *  <when>: <name>: <message-body> */
class OstreamLogger : public Logger
{
  protected:
    std::ostream &stream;

  public:
    OstreamLogger(std::ostream &stream_) : stream(stream_)
    { }

    void logMessage(Tick when, const std::string &name,
            const std::string &flag, const std::string &message) override;

    std::ostream &getOstream() override { return stream; }
};

/** Get the current global debug logger.  This takes ownership of the given
 *  logger which should be allocated using 'new' */
Logger *getDebugLogger();

/** Get the ostream from the current global logger */
std::ostream &output();

/** Delete the current global logger and assign a new one */
void setDebugLogger(Logger *logger);

/** Enable/disable debug logging */
void enable();
void disable();

} // namespace Trace

// This silly little class allows us to wrap a string in a functor
// object so that we can give a name() that DPRINTF will like
struct StringWrap
{
    std::string str;
    StringWrap(const std::string &s) : str(s) {}
    const std::string &operator()() const { return str; }
};

/**
 * DPRINTF is a debugging trace facility that allows one to
 * selectively enable tracing statements.  To use DPRINTF, there must
 * be a function or functor called name() that returns a const
 * std::string & in the current scope.
 *
 * If you desire that the automatic printing not occur, use DPRINTFR
 * (R for raw)
 *
 * With DPRINTFV it is possible to pass a debug::SimpleFlag variable
 * as first argument. Example:
 *
 * debug::Flag some_flag = debug::DMA;
 * DPRINTFV(some_flag, ...);
 *
 * \def DDUMP(x, data, count)
 * \def DPRINTF(x, ...)
 * \def DPRINTFS(x, s, ...)
 * \def DPRINTFR(x, ...)
 * \def DPRINTFV(x, ...)
 * \def DPRINTFN(...)
 * \def DPRINTFNR(...)
 * \def DPRINTF_UNCONDITIONAL(x, ...) (deprecated)
 *
 * @ingroup api_trace
 * @{
 */

#define DDUMP(x, data, count) do {               \
    if (GEM5_UNLIKELY(TRACING_ON && ::gem5::debug::x))     \
        ::gem5::Trace::getDebugLogger()->dump(           \
            ::gem5::curTick(), name(), data, count, #x); \
} while (0)

#define DPRINTF(x, ...) do {                     \
    if (GEM5_UNLIKELY(TRACING_ON && ::gem5::debug::x)) {   \
        ::gem5::Trace::getDebugLogger()->dprintf_flag(   \
            ::gem5::curTick(), name(), #x, __VA_ARGS__); \
    }                                            \
} while (0)

#define DPRINTFS(x, s, ...) do {                        \
    if (GEM5_UNLIKELY(TRACING_ON && ::gem5::debug::x)) {          \
        ::gem5::Trace::getDebugLogger()->dprintf_flag(          \
                ::gem5::curTick(), (s)->name(), #x, __VA_ARGS__); \
    }                                                   \
} while (0)

#define DPRINTFR(x, ...) do {                          \
    if (GEM5_UNLIKELY(TRACING_ON && ::gem5::debug::x)) {         \
        ::gem5::Trace::getDebugLogger()->dprintf_flag(         \
            (::gem5::Tick)-1, std::string(), #x, __VA_ARGS__); \
    }                                                  \
} while (0)

#define DPRINTFV(x, ...) do {                          \
    if (GEM5_UNLIKELY(TRACING_ON && (x))) {              \
        ::gem5::Trace::getDebugLogger()->dprintf_flag(         \
            ::gem5::curTick(), name(), x.name(), __VA_ARGS__); \
    }                                                  \
} while (0)

#define DPRINTFN(...) do {                                                \
    if (TRACING_ON) {                                                     \
        ::gem5::Trace::getDebugLogger()->dprintf( \
            ::gem5::curTick(), name(), __VA_ARGS__); \
    }                                                                     \
} while (0)

#define DPRINTFNR(...) do {                                          \
    if (TRACING_ON) {                                                \
        ::gem5::Trace::getDebugLogger()->dprintf( \
            (::gem5::Tick)-1, "", __VA_ARGS__); \
    }                                                                \
} while (0)

#define DPRINTF_UNCONDITIONAL(x, ...)                      \
    GEM5_DEPRECATED_MACRO_STMT(DPRINTF_UNCONDITIONAL,      \
    do {                                                   \
        if (TRACING_ON) {                                  \
            ::gem5::Trace::getDebugLogger()->dprintf_flag(         \
                ::gem5::curTick(), name(), #x, __VA_ARGS__);       \
        }                                                  \
    } while (0),                                           \
    "Use DPRINTFN or DPRINTF with a debug flag instead.")

/** @} */ // end of api_trace

} // namespace gem5

#endif // __BASE_TRACE_HH__