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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/Streams.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; }
};
template <typename T>
struct VISIBILITY_HIDDEN LeakDetectorImpl {
explicit LeakDetectorImpl(const char* const name) : Cache(0), Name(name) { }
// 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 (Cache) {
assert(Ts.count(Cache) == 0 && "Object already in set!");
Ts.insert(Cache);
}
Cache = o;
}
void removeGarbage(const T* o) {
if (o == Cache)
Cache = 0; // Cache hit
else
Ts.erase(o);
}
bool hasGarbage(const std::string& Message) {
addGarbage(0); // Flush the Cache
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';
return true;
}
return false;
}
private:
SmallPtrSet<const T*, 8> Ts;
const T* Cache;
const char* const Name;
};
static LeakDetectorImpl<void> *Objects;
static LeakDetectorImpl<Value> *LLVMObjects;
static LeakDetectorImpl<void> &getObjects() {
if (Objects == 0)
Objects = new LeakDetectorImpl<void>("GENERIC");
return *Objects;
}
static LeakDetectorImpl<Value> &getLLVMObjects() {
if (LLVMObjects == 0)
LLVMObjects = new LeakDetectorImpl<Value>("LLVM");
return *LLVMObjects;
}
static void clearGarbage() {
delete Objects;
delete LLVMObjects;
Objects = 0;
LLVMObjects = 0;
}
}
void LeakDetector::addGarbageObjectImpl(void *Object) {
getObjects().addGarbage(Object);
}
void LeakDetector::addGarbageObjectImpl(const Value *Object) {
getLLVMObjects().addGarbage(Object);
}
void LeakDetector::removeGarbageObjectImpl(void *Object) {
getObjects().removeGarbage(Object);
}
void LeakDetector::removeGarbageObjectImpl(const Value *Object) {
getLLVMObjects().removeGarbage(Object);
}
void LeakDetector::checkForGarbageImpl(const std::string &Message) {
// use non-short-circuit version so that both checks are performed
if (getObjects().hasGarbage(Message) |
getLLVMObjects().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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