1 //===-- Valgrind.cpp - Implement Valgrind communication ---------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  Defines Valgrind communication methods, if HAVE_VALGRIND_VALGRIND_H is
11 //  defined.  If we have valgrind.h but valgrind isn't running, its macros are
12 //  no-ops.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #include "llvm/Support/Valgrind.h"
17 #include "llvm/Config/config.h"
18 #include <cstddef>
19 
20 #if HAVE_VALGRIND_VALGRIND_H
21 #include <valgrind/valgrind.h>
22 
InitNotUnderValgrind()23 static bool InitNotUnderValgrind() {
24   return !RUNNING_ON_VALGRIND;
25 }
26 
27 // This bool is negated from what we'd expect because code may run before it
28 // gets initialized.  If that happens, it will appear to be 0 (false), and we
29 // want that to cause the rest of the code in this file to run the
30 // Valgrind-provided macros.
31 static const bool NotUnderValgrind = InitNotUnderValgrind();
32 
RunningOnValgrind()33 bool llvm::sys::RunningOnValgrind() {
34   if (NotUnderValgrind)
35     return false;
36   return RUNNING_ON_VALGRIND;
37 }
38 
ValgrindDiscardTranslations(const void * Addr,size_t Len)39 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
40   if (NotUnderValgrind)
41     return;
42 
43   VALGRIND_DISCARD_TRANSLATIONS(Addr, Len);
44 }
45 
46 #else  // !HAVE_VALGRIND_VALGRIND_H
47 
RunningOnValgrind()48 bool llvm::sys::RunningOnValgrind() {
49   return false;
50 }
51 
ValgrindDiscardTranslations(const void * Addr,size_t Len)52 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
53 }
54 
55 #endif  // !HAVE_VALGRIND_VALGRIND_H
56