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/* Copyright (c) 2008-2009, Google Inc.
* 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 Google Inc. 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,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* 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.
*
* ---
* Author: Kostya Serebryany
*/
#ifdef __cplusplus
# error "This file should be built as pure C to avoid name mangling"
#endif
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "base/dynamic_annotations.h"
#include "getenv_safe.h" // for TCMallocGetenvSafe
#ifdef __GNUC__
/* valgrind.h uses gcc extensions so it won't build with other compilers */
# ifdef HAVE_VALGRIND_H /* prefer the user's copy if they have it */
# include <valgrind.h>
# else /* otherwise just use the copy that we have */
# include "third_party/valgrind.h"
# endif
#endif
/* Compiler-based ThreadSanitizer defines
DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL = 1
and provides its own definitions of the functions. */
#ifndef DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL
# define DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL 0
#endif
/* Each function is empty and called (via a macro) only in debug mode.
The arguments are captured by dynamic tools at runtime. */
#if DYNAMIC_ANNOTATIONS_ENABLED == 1 \
&& DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0
void AnnotateRWLockCreate(const char *file, int line,
const volatile void *lock){}
void AnnotateRWLockDestroy(const char *file, int line,
const volatile void *lock){}
void AnnotateRWLockAcquired(const char *file, int line,
const volatile void *lock, long is_w){}
void AnnotateRWLockReleased(const char *file, int line,
const volatile void *lock, long is_w){}
void AnnotateBarrierInit(const char *file, int line,
const volatile void *barrier, long count,
long reinitialization_allowed) {}
void AnnotateBarrierWaitBefore(const char *file, int line,
const volatile void *barrier) {}
void AnnotateBarrierWaitAfter(const char *file, int line,
const volatile void *barrier) {}
void AnnotateBarrierDestroy(const char *file, int line,
const volatile void *barrier) {}
void AnnotateCondVarWait(const char *file, int line,
const volatile void *cv,
const volatile void *lock){}
void AnnotateCondVarSignal(const char *file, int line,
const volatile void *cv){}
void AnnotateCondVarSignalAll(const char *file, int line,
const volatile void *cv){}
void AnnotatePublishMemoryRange(const char *file, int line,
const volatile void *address,
long size){}
void AnnotateUnpublishMemoryRange(const char *file, int line,
const volatile void *address,
long size){}
void AnnotatePCQCreate(const char *file, int line,
const volatile void *pcq){}
void AnnotatePCQDestroy(const char *file, int line,
const volatile void *pcq){}
void AnnotatePCQPut(const char *file, int line,
const volatile void *pcq){}
void AnnotatePCQGet(const char *file, int line,
const volatile void *pcq){}
void AnnotateNewMemory(const char *file, int line,
const volatile void *mem,
long size){}
void AnnotateExpectRace(const char *file, int line,
const volatile void *mem,
const char *description){}
void AnnotateBenignRace(const char *file, int line,
const volatile void *mem,
const char *description){}
void AnnotateBenignRaceSized(const char *file, int line,
const volatile void *mem,
long size,
const char *description) {}
void AnnotateMutexIsUsedAsCondVar(const char *file, int line,
const volatile void *mu){}
void AnnotateTraceMemory(const char *file, int line,
const volatile void *arg){}
void AnnotateThreadName(const char *file, int line,
const char *name){}
void AnnotateIgnoreReadsBegin(const char *file, int line){}
void AnnotateIgnoreReadsEnd(const char *file, int line){}
void AnnotateIgnoreWritesBegin(const char *file, int line){}
void AnnotateIgnoreWritesEnd(const char *file, int line){}
void AnnotateEnableRaceDetection(const char *file, int line, int enable){}
void AnnotateNoOp(const char *file, int line,
const volatile void *arg){}
void AnnotateFlushState(const char *file, int line){}
#endif /* DYNAMIC_ANNOTATIONS_ENABLED == 1
&& DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 */
#if DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0
static int GetRunningOnValgrind(void) {
#ifdef RUNNING_ON_VALGRIND
if (RUNNING_ON_VALGRIND) return 1;
#endif
const char *running_on_valgrind_str = TCMallocGetenvSafe("RUNNING_ON_VALGRIND");
if (running_on_valgrind_str) {
return strcmp(running_on_valgrind_str, "0") != 0;
}
return 0;
}
/* See the comments in dynamic_annotations.h */
int RunningOnValgrind(void) {
static volatile int running_on_valgrind = -1;
int local_running_on_valgrind = running_on_valgrind;
/* C doesn't have thread-safe initialization of statics, and we
don't want to depend on pthread_once here, so hack it. */
ANNOTATE_BENIGN_RACE(&running_on_valgrind, "safe hack");
if (local_running_on_valgrind == -1)
running_on_valgrind = local_running_on_valgrind = GetRunningOnValgrind();
return local_running_on_valgrind;
}
#endif /* DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 */
/* See the comments in dynamic_annotations.h */
double ValgrindSlowdown(void) {
/* Same initialization hack as in RunningOnValgrind(). */
static volatile double slowdown = 0.0;
double local_slowdown = slowdown;
ANNOTATE_BENIGN_RACE(&slowdown, "safe hack");
if (RunningOnValgrind() == 0) {
return 1.0;
}
if (local_slowdown == 0.0) {
char *env = getenv("VALGRIND_SLOWDOWN");
slowdown = local_slowdown = env ? atof(env) : 50.0;
}
return local_slowdown;
}
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