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/Metadata.h"
  18 #include "llvm/IR/Value.h"
  19 #include "llvm/Support/Compiler.h"
  20 #include "llvm/Support/ManagedStatic.h"
  21 #include "llvm/Support/Mutex.h"
  22 #include "llvm/Support/Threading.h"
  23 using namespace llvm;
  24
  25 static ManagedStatic<sys::SmartMutex<true> > ObjectsLock;
  26 static ManagedStatic<LeakDetectorImpl<void> > Objects;
  27
  28 static void clearGarbage(LLVMContext &Context) {
  29   Objects->clear();
  30   Context.pImpl->LLVMObjects.clear();
  31 }
  32
  33 void LeakDetector::addGarbageObjectImpl(void *Object) {
  34   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  35   Objects->addGarbage(Object);
  36 }
  37
  38 void LeakDetector::addGarbageObjectImpl(const Value *Object) {
  39   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  40   pImpl->LLVMObjects.addGarbage(Object);
  41 }
  42
  43 void LeakDetector::addGarbageObjectImpl(const MDNode *Object) {
  44   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  45   pImpl->LLVMMDObjects.addGarbage(Object);
  46 }
  47
  48 void LeakDetector::removeGarbageObjectImpl(void *Object) {
  49   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  50   Objects->removeGarbage(Object);
  51 }
  52
  53 void LeakDetector::removeGarbageObjectImpl(const Value *Object) {
  54   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  55   pImpl->LLVMObjects.removeGarbage(Object);
  56 }
  57
  58 void LeakDetector::removeGarbageObjectImpl(const MDNode *Object) {
  59   LLVMContextImpl *pImpl = Object->getContext().pImpl;
  60   pImpl->LLVMMDObjects.removeGarbage(Object);
  61 }
  62
  63 void LeakDetector::checkForGarbageImpl(LLVMContext &Context,
  64                                        const std::string &Message) {
  65   LLVMContextImpl *pImpl = Context.pImpl;
  66   sys::SmartScopedLock<true> Lock(*ObjectsLock);
  67
  68   Objects->setName("GENERIC");
  69   pImpl->LLVMObjects.setName("LLVM");
  70   pImpl->LLVMMDObjects.setName("LLVM-MD");
  71
  72   // use non-short-circuit version so that both checks are performed
  73   if (Objects->hasGarbage(Message) |
  74       pImpl->LLVMObjects.hasGarbage(Message) |
  75       pImpl->LLVMMDObjects.hasGarbage(Message))
  76     errs() << "\nThis is probably because you removed an object, but didn't "
  77            << "delete it.  Please check your code for memory leaks.\n";
  78
  79   // Clear out results so we don't get duplicate warnings on
  80   // next call...
  81   clearGarbage(Context);
  82 }