lib/IR/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 "llvm/IR/LeakDetector.h"
  15 #include "LLVMContextImpl.h"
  16 #include "llvm/ADT/SmallPtrSet.h"
  17 #include "llvm/IR/Value.h"
  18 #include "llvm/Support/Compiler.h"
  19 #include "llvm/Support/ManagedStatic.h"
  20 #include "llvm/Support/Mutex.h"
  21 #include "llvm/Support/Threading.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   pImpl->LLVMObjects.addGarbage(Object);
  40 }
  41
  42 void LeakDetector::removeGarbageObjectImpl(void *Object) {
  43   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  44   Objects->removeGarbage(Object);
  45 }
  46
  47 void LeakDetector::removeGarbageObjectImpl(const Value *Object) {
  48   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  49   pImpl->LLVMObjects.removeGarbage(Object);
  50 }
  51
  52 void LeakDetector::checkForGarbageImpl(LLVMContext &Context,
  53                                        const std::string &Message) {
  54   LLVMContextImpl *pImpl = Context.pImpl;
  55   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  56
  57   Objects->setName("GENERIC");
  58   pImpl->LLVMObjects.setName("LLVM");
  59
  60   // use non-short-circuit version so that both checks are performed
  61   if (Objects->hasGarbage(Message) |
  62       pImpl->LLVMObjects.hasGarbage(Message))
  63     errs() << "\nThis is probably because you removed an object, but didn't "
  64            << "delete it.  Please check your code for memory leaks.\n";
  65
  66   // Clear out results so we don't get duplicate warnings on
  67   // next call...
  68   clearGarbage(Context);
  69 }