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//===- LeaksContext.h - LeadDetector Implementation ------------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines various helper methods and classes used by
// LLVMContextImpl for leaks detectors.
//
//===----------------------------------------------------------------------===//
#include "llvm/Value.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
template <class T>
struct PrinterTrait {
static void print(const T* P) { errs() << P; }
};
template<>
struct PrinterTrait<Value> {
static void print(const Value* P) { errs() << *P; }
};
template <typename T>
struct 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) {
assert(Ts.count(o) == 0 && "Object already in set!");
if (Cache) {
assert(Cache != o && "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()) {
errs() << "Leaked " << Name << " objects found: " << Message << ":\n";
for (typename SmallPtrSet<const T*, 8>::iterator I = Ts.begin(),
E = Ts.end(); I != E; ++I) {
errs() << '\t';
PrinterTrait<T>::print(*I);
errs() << '\n';
}
errs() << '\n';
return true;
}
return false;
}
private:
SmallPtrSet<const T*, 8> Ts;
const T* Cache;
const char* Name;
};
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