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//===-- LeakDetector.cpp - Implement LeakDetector interface ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the LeakDetector class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/LeakDetector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/RWMutex.h"
#include "llvm/System/Threading.h"
#include "llvm/Value.h"
using namespace llvm;
namespace {
template <class T>
struct VISIBILITY_HIDDEN PrinterTrait {
static void print(const T* P) { cerr << P; }
};
template<>
struct VISIBILITY_HIDDEN PrinterTrait<Value> {
static void print(const Value* P) { cerr << *P; }
};
ManagedStatic<sys::RWMutex> LeakDetectorLock;
template <typename T>
struct VISIBILITY_HIDDEN LeakDetectorImpl {
explicit LeakDetectorImpl(const char* const name = "") :
Cache(0), Name(name) { }
void clear() {
Cache = 0;
Ts.clear();
}
void setName(const char* n) {
Name = n;
}
// Because the most common usage pattern, by far, is to add a
// garbage object, then remove it immediately, we optimize this
// case. When an object is added, it is not added to the set
// immediately, it is added to the CachedValue Value. If it is
// immediately removed, no set search need be performed.
void addGarbage(const T* o) {
if (llvm_is_multithreaded()) {
sys::ScopedWriter Writer(&*LeakDetectorLock);
if (Cache) {
assert(Ts.count(Cache) == 0 && "Object already in set!");
Ts.insert(Cache);
}
Cache = o;
} else {
if (Cache) {
assert(Ts.count(Cache) == 0 && "Object already in set!");
Ts.insert(Cache);
}
Cache = o;
}
}
void removeGarbage(const T* o) {
if (llvm_is_multithreaded()) {
sys::ScopedWriter Writer(&*LeakDetectorLock);
if (o == Cache)
Cache = 0; // Cache hit
else
Ts.erase(o);
} else {
if (o == Cache)
Cache = 0; // Cache hit
else
Ts.erase(o);
}
}
bool hasGarbage(const std::string& Message) {
addGarbage(0); // Flush the Cache
if (llvm_is_multithreaded()) LeakDetectorLock->reader_acquire();
assert(Cache == 0 && "No value should be cached anymore!");
if (!Ts.empty()) {
cerr << "Leaked " << Name << " objects found: " << Message << ":\n";
for (typename SmallPtrSet<const T*, 8>::iterator I = Ts.begin(),
E = Ts.end(); I != E; ++I) {
cerr << "\t";
PrinterTrait<T>::print(*I);
cerr << "\n";
}
cerr << '\n';
if (llvm_is_multithreaded()) LeakDetectorLock->reader_release();
return true;
}
if (llvm_is_multithreaded()) LeakDetectorLock->reader_release();
return false;
}
private:
SmallPtrSet<const T*, 8> Ts;
const T* Cache;
const char* Name;
};
static ManagedStatic<LeakDetectorImpl<void> > Objects;
static ManagedStatic<LeakDetectorImpl<Value> > LLVMObjects;
static void clearGarbage() {
Objects->clear();
LLVMObjects->clear();
}
}
void LeakDetector::addGarbageObjectImpl(void *Object) {
Objects->addGarbage(Object);
}
void LeakDetector::addGarbageObjectImpl(const Value *Object) {
LLVMObjects->addGarbage(Object);
}
void LeakDetector::removeGarbageObjectImpl(void *Object) {
Objects->removeGarbage(Object);
}
void LeakDetector::removeGarbageObjectImpl(const Value *Object) {
LLVMObjects->removeGarbage(Object);
}
void LeakDetector::checkForGarbageImpl(const std::string &Message) {
Objects->setName("GENERIC");
LLVMObjects->setName("LLVM");
// use non-short-circuit version so that both checks are performed
if (Objects->hasGarbage(Message) |
LLVMObjects->hasGarbage(Message))
cerr << "\nThis is probably because you removed an object, but didn't "
<< "delete it. Please check your code for memory leaks.\n";
// Clear out results so we don't get duplicate warnings on
// next call...
clearGarbage();
}
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