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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdlib.h>
#include <string.h>
#include "absl/base/dynamic_annotations.h"
#ifndef __has_feature
#define __has_feature(x) 0
#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_EXTERNAL_IMPL == 0 && !defined(__native_client__)
#if __has_feature(memory_sanitizer)
#include <sanitizer/msan_interface.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
void AnnotateRWLockCreate(const char *, int,
const volatile void *){}
void AnnotateRWLockDestroy(const char *, int,
const volatile void *){}
void AnnotateRWLockAcquired(const char *, int,
const volatile void *, long){}
void AnnotateRWLockReleased(const char *, int,
const volatile void *, long){}
void AnnotateBenignRace(const char *, int,
const volatile void *,
const char *){}
void AnnotateBenignRaceSized(const char *, int,
const volatile void *,
size_t,
const char *) {}
void AnnotateThreadName(const char *, int,
const char *){}
void AnnotateIgnoreReadsBegin(const char *, int){}
void AnnotateIgnoreReadsEnd(const char *, int){}
void AnnotateIgnoreWritesBegin(const char *, int){}
void AnnotateIgnoreWritesEnd(const char *, int){}
void AnnotateEnableRaceDetection(const char *, int, int){}
void AnnotateMemoryIsInitialized(const char *, int,
const volatile void *mem, size_t size) {
#if __has_feature(memory_sanitizer)
__msan_unpoison(mem, size);
#else
(void)mem;
(void)size;
#endif
}
void AnnotateMemoryIsUninitialized(const char *, int,
const volatile void *mem, size_t size) {
#if __has_feature(memory_sanitizer)
__msan_allocated_memory(mem, size);
#else
(void)mem;
(void)size;
#endif
}
static int GetRunningOnValgrind(void) {
#ifdef RUNNING_ON_VALGRIND
if (RUNNING_ON_VALGRIND) return 1;
#endif
char *running_on_valgrind_str = getenv("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;
}
/* 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;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif /* DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 */
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