jit/ExecutableAllocationFuzz.cpp

   1 /*
   2  * Copyright (C) 2015 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "ExecutableAllocationFuzz.h"
  28
  29 #include "TestRunnerUtils.h"
  30 #include <wtf/Atomics.h>
  31 #include <wtf/DataLog.h>
  32
  33 namespace JSC {
  34
  35 static Atomic<unsigned> s_numberOfExecutableAllocationFuzzChecks;
  36 unsigned numberOfExecutableAllocationFuzzChecks()
  37 {
  38     return s_numberOfExecutableAllocationFuzzChecks.load();
  39 }
  40
  41 ExecutableAllocationFuzzResult doExecutableAllocationFuzzing()
  42 {
  43     ASSERT(Options::enableExecutableAllocationFuzz());
  44
  45     unsigned oldValue;
  46     unsigned newValue;
  47     do {
  48         oldValue = s_numberOfExecutableAllocationFuzzChecks.load();
  49         newValue = oldValue + 1;
  50     } while (!s_numberOfExecutableAllocationFuzzChecks.compareExchangeWeak(oldValue, newValue));
  51
  52     if (newValue == Options::fireExecutableAllocationFuzzAt()) {
  53         if (Options::verboseExecutableAllocationFuzz()) {
  54             dataLog("Will pretend to fail executable allocation.\n");
  55             WTFReportBacktrace();
  56         }
  57         return PretendToFailExecutableAllocation;
  58     }
  59
  60     if (Options::fireExecutableAllocationFuzzAtOrAfter()
  61         && newValue >= Options::fireExecutableAllocationFuzzAtOrAfter()) {
  62         if (Options::verboseExecutableAllocationFuzz()) {
  63             dataLog("Will pretend to fail executable allocation.\n");
  64             WTFReportBacktrace();
  65         }
  66         return PretendToFailExecutableAllocation;
  67     }
  68
  69     return AllowNormalExecutableAllocation;
  70 }
  71
  72 } // namespace JSC
  73