lib/VMCore/LeakDetector.cpp

   1 //===-- LeakDetector.cpp - Implement LeakDetector interface ---------------===//
   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 // This file implements the LeakDetector class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "LLVMContextImpl.h"
  15 #include "llvm/Support/LeakDetector.h"
  16 #include "llvm/ADT/SmallPtrSet.h"
  17 #include "llvm/Support/Compiler.h"
  18 #include "llvm/Support/ManagedStatic.h"
  19 #include "llvm/System/Mutex.h"
  20 #include "llvm/System/Threading.h"
  21 #include "llvm/Value.h"
  22 using namespace llvm;
  23
  24 static ManagedStatic<sys::SmartMutex<true> > ObjectsLock;
  25 static ManagedStatic<LeakDetectorImpl<void> > Objects;
  26
  27 static void clearGarbage(LLVMContext &Context) {
  28   Objects->clear();
  29   Context.pImpl->LLVMObjects.clear();
  30 }
  31
  32 void LeakDetector::addGarbageObjectImpl(void *Object) {
  33   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  34   Objects->addGarbage(Object);
  35 }
  36
  37 void LeakDetector::addGarbageObjectImpl(const Value *Object) {
  38   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  39   sys::SmartScopedLock<true> Lock(pImpl->LLVMObjectsLock);
  40   pImpl->LLVMObjects.addGarbage(Object);
  41 }
  42
  43 void LeakDetector::removeGarbageObjectImpl(void *Object) {
  44   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  45   Objects->removeGarbage(Object);
  46 }
  47
  48 void LeakDetector::removeGarbageObjectImpl(const Value *Object) {
  49   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  50   sys::SmartScopedLock<true> Lock(pImpl->LLVMObjectsLock);
  51   pImpl->LLVMObjects.removeGarbage(Object);
  52 }
  53
  54 void LeakDetector::checkForGarbageImpl(LLVMContext &Context,
  55                                        const std::string &Message) {
  56   LLVMContextImpl *pImpl = Context.pImpl;
  57   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  58   sys::SmartScopedLock<true> CLock(pImpl->LLVMObjectsLock);
  59
  60   Objects->setName("GENERIC");
  61   pImpl->LLVMObjects.setName("LLVM");
  62
  63   // use non-short-circuit version so that both checks are performed
  64   if (Objects->hasGarbage(Message) |
  65       pImpl->LLVMObjects.hasGarbage(Message))
  66     errs() << "\nThis is probably because you removed an object, but didn't "
  67            << "delete it.  Please check your code for memory leaks.\n";
  68
  69   // Clear out results so we don't get duplicate warnings on
  70   // next call...
  71   clearGarbage(Context);
  72 }