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
19 #if HAVE_VALGRIND_VALGRIND_H
20 #include <valgrind/valgrind.h>
21
InitNotUnderValgrind()22 static 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.
30 static const bool NotUnderValgrind = InitNotUnderValgrind();
31
RunningOnValgrind()32 bool llvm::sys::RunningOnValgrind() {
33 if (NotUnderValgrind)
34 return false;
35 return RUNNING_ON_VALGRIND;
36 }
37
ValgrindDiscardTranslations(const void * Addr,size_t Len)38 void 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
RunningOnValgrind()47 bool llvm::sys::RunningOnValgrind() {
48 return false;
49 }
50
ValgrindDiscardTranslations(const void * Addr,size_t Len)51 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
52 }
53
54 #endif // !HAVE_VALGRIND_VALGRIND_H
55
56 #if LLVM_ENABLE_THREADS != 0 && !defined(NDEBUG)
57 // These functions require no implementation, tsan just looks at the arguments
58 // they're called with. However, they are required to be weak as some other
59 // application or library may already be providing these definitions for the
60 // same reason we are.
61 extern "C" {
62 LLVM_ATTRIBUTE_WEAK void AnnotateHappensAfter(const char *file, int line,
63 const volatile void *cv);
AnnotateHappensAfter(const char * file,int line,const volatile void * cv)64 void AnnotateHappensAfter(const char *file, int line, const volatile void *cv) {
65 }
66 LLVM_ATTRIBUTE_WEAK void AnnotateHappensBefore(const char *file, int line,
67 const volatile void *cv);
AnnotateHappensBefore(const char * file,int line,const volatile void * cv)68 void AnnotateHappensBefore(const char *file, int line,
69 const volatile void *cv) {}
70 LLVM_ATTRIBUTE_WEAK void AnnotateIgnoreWritesBegin(const char *file, int line);
AnnotateIgnoreWritesBegin(const char * file,int line)71 void AnnotateIgnoreWritesBegin(const char *file, int line) {}
72 LLVM_ATTRIBUTE_WEAK void AnnotateIgnoreWritesEnd(const char *file, int line);
AnnotateIgnoreWritesEnd(const char * file,int line)73 void AnnotateIgnoreWritesEnd(const char *file, int line) {}
74 }
75 #endif
76