1//===-- Valgrind.cpp - Implement Valgrind communication ---------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  Defines Valgrind communication methods, if HAVE_VALGRIND_VALGRIND_H is
10//  defined.  If we have valgrind.h but valgrind isn't running, its macros are
11//  no-ops.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/Support/Valgrind.h"
16#include "llvm/Config/config.h"
17#include <cstddef>
18
19#if HAVE_VALGRIND_VALGRIND_H
20#include <valgrind/valgrind.h>
21
22static bool InitNotUnderValgrind() {
23  return !RUNNING_ON_VALGRIND;
24}
25
26// This bool is negated from what we'd expect because code may run before it
27// gets initialized.  If that happens, it will appear to be 0 (false), and we
28// want that to cause the rest of the code in this file to run the
29// Valgrind-provided macros.
30static const bool NotUnderValgrind = InitNotUnderValgrind();
31
32bool llvm::sys::RunningOnValgrind() {
33  if (NotUnderValgrind)
34    return false;
35  return RUNNING_ON_VALGRIND;
36}
37
38void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
39  if (NotUnderValgrind)
40    return;
41
42  VALGRIND_DISCARD_TRANSLATIONS(Addr, Len);
43}
44
45#else  // !HAVE_VALGRIND_VALGRIND_H
46
47bool llvm::sys::RunningOnValgrind() {
48  return false;
49}
50
51void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
52}
53
54#endif  // !HAVE_VALGRIND_VALGRIND_H
55