DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (5b81998bb7ab)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=4 sw=4 et tw=79: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "TraceLogging.h"
#include <cstdarg>
#include <cstdio>
#include <cstdlib>
#include <unistd.h>
#include <string.h>
#include <stdint.h>

#ifndef TRACE_LOG_DIR
# if defined(_WIN32)
#  define TRACE_LOG_DIR ""
# else
#  define TRACE_LOG_DIR "/tmp/"
# endif
#endif

namespace js {

#if defined(__i386__)
static __inline__ uint64_t
rdtsc(void)
{
    uint64_t x;
    __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
    return x;
}
#elif defined(__x86_64__)
static __inline__ uint64_t
rdtsc(void)
{
    unsigned hi, lo;
    __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
    return ( (uint64_t)lo)|( ((uint64_t)hi)<<32 );
}
#elif defined(__powerpc__)
static __inline__ uint64_t
rdtsc(void)
{
    uint64_t result=0;
    uint32_t upper, lower,tmp;
    __asm__ volatile(
            "0:                  \n"
            "\tmftbu   %0           \n"
            "\tmftb    %1           \n"
            "\tmftbu   %2           \n"
            "\tcmpw    %2,%0        \n"
            "\tbne     0b         \n"
            : "=r"(upper),"=r"(lower),"=r"(tmp)
            );
    result = upper;
    result = result<<32;
    result = result|lower;

    return(result);
}
#endif

const char* TraceLogging::type_name[] = {
    "start,ion_compile",
    "stop,ion_compile",
    "start,ion_cannon",
    "stop,ion_cannon",
    "stop,ion_cannon_bailout",
    "start,ion_side_cannon",
    "stop,ion_side_cannon",
    "stop,ion_side_cannon_bailout",
    "start,yarr_jit_execute",
    "stop,yarr_jit_execute",
    "start,jm_safepoint",
    "stop,jm_safepoint",
    "start,jm_normal",
    "stop,jm_normal",
    "start,jm_compile",
    "stop,jm_compile",
    "start,gc",
    "stop,gc",
    "start,interpreter",
    "stop,interpreter"
};
TraceLogging* TraceLogging::_defaultLogger = NULL;

TraceLogging::TraceLogging()
  : loggingTime(0),
    entries(NULL),
    curEntry(0),
    numEntries(1000000),
    fileno(0),
    out(NULL)
{
}

TraceLogging::~TraceLogging()
{
    if (out != NULL) {
        fclose(out);
        out = NULL;
    }

    if (entries != NULL) {
        flush();
        free(entries);
        entries = NULL;
    }
}

void
TraceLogging::grow()
{
    Entry* nentries = (Entry*) realloc(entries, numEntries*2*sizeof(Entry));

    // Allocating a bigger array failed.
    // Keep using the current storage, but remove all entries by flushing them.
    if (nentries == NULL) {
        flush();
        return;
    }

    entries = nentries;
    numEntries *= 2;
}

void
TraceLogging::log(Type type, const char* file, unsigned int lineno)
{
    uint64_t now = rdtsc();

    // Create array containing the entries if not existing.
    if (entries == NULL) {
        entries = (Entry*) malloc(numEntries*sizeof(Entry));
        if (entries == NULL)
            return;
    }

    // Copy the logging information,
    // because original could already be freed before writing the log file.
    char *copy = NULL;
    if (file != NULL)
        copy = strdup(file);

    entries[curEntry++] = Entry(now - loggingTime, copy, lineno, type);

    // Increase length when not enough place in the array
    if (curEntry >= numEntries)
        grow();

    // Save the time spend logging the information in order to discard this time from the logged time.
    // Especially needed when increasing the array or flushing the information.
    loggingTime += rdtsc()-now;
}

void
TraceLogging::log(Type type, JSScript* script)
{
    this->log(type, script->filename, script->lineno);
}

void
TraceLogging::log(const char* log)
{
    this->log(INFO, log, 0);
}

void
TraceLogging::log(Type type)
{
    this->log(type, NULL, 0);
}

void
TraceLogging::flush()
{
    // Open the logging file, when not opened yet.
    if (out == NULL)
        out = fopen(TRACE_LOG_DIR "tracelogging.log", "w");

    // Print all log entries into the file
    for (unsigned int i = 0; i < curEntry; i++) {
        int written;
        if (entries[i].type() == INFO) {
            written = fprintf(out, "INFO,%s\n", entries[i].file());
        } else {
            if (entries[i].file() == NULL) {
                written = fprintf(out, "%llu,%s\n",
                                  (unsigned long long)entries[i].tick(),
                                  type_name[entries[i].type()]);
            } else {
                written = fprintf(out, "%llu,%s,%s:%d\n",
                                  (unsigned long long)entries[i].tick(),
                                  type_name[entries[i].type()],
                                  entries[i].file(),
                                  entries[i].lineno());
            }
        }

        // A logging file can only be 2GB of length (fwrite limit).
        // When we exceed this limit, the writing will fail.
        // In that case try creating a extra file to write the log entries.
        if (written < 0) {
            fclose(out);
            if (fileno >= 9999)
                exit(-1);

            char filename[21 + sizeof(TRACE_LOG_DIR)];
            sprintf (filename, TRACE_LOG_DIR "tracelogging-%d.log", ++fileno);
            out = fopen(filename, "w");
            i--; // Try to print message again
            continue;
        }

        if (entries[i].file() != NULL) {
            free(entries[i].file());
            entries[i].file_ = NULL;
        }
    }
    curEntry = 0;
}

TraceLogging*
TraceLogging::defaultLogger()
{
    if (_defaultLogger == NULL) {
        _defaultLogger = new TraceLogging();
        atexit (releaseDefaultLogger);
    }
    return _defaultLogger;
}

void
TraceLogging::releaseDefaultLogger()
{
    if (_defaultLogger != NULL) {
        delete _defaultLogger;
        _defaultLogger = NULL;
    }
}

/* Helper functions for asm calls */
void
TraceLog(TraceLogging* logger, TraceLogging::Type type, JSScript* script)
{
    logger->log(type, script);
}
void
TraceLog(TraceLogging* logger, const char* log)
{
    logger->log(log);
}
void
TraceLog(TraceLogging* logger, TraceLogging::Type type)
{
    logger->log(type);
}

}  /* namespace js */