99 lines
2.4 KiB
C++
99 lines
2.4 KiB
C++
//===- LeaksContext.h - LeadDetector Implementation ------------*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines various helper methods and classes used by
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// LLVMContextImpl for leaks detectors.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_LEAKSCONTEXT_H
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#define LLVM_IR_LEAKSCONTEXT_H
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/IR/Value.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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template <class T>
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struct PrinterTrait {
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static void print(const T* P) { errs() << P; }
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};
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template<>
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struct PrinterTrait<Value> {
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static void print(const Value* P) { errs() << *P; }
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};
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template <typename T>
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struct LeakDetectorImpl {
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explicit LeakDetectorImpl(const char* const name = "") :
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Cache(nullptr), Name(name) { }
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void clear() {
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Cache = nullptr;
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Ts.clear();
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}
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void setName(const char* n) {
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Name = n;
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}
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// Because the most common usage pattern, by far, is to add a
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// garbage object, then remove it immediately, we optimize this
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// case. When an object is added, it is not added to the set
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// immediately, it is added to the CachedValue Value. If it is
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// immediately removed, no set search need be performed.
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void addGarbage(const T* o) {
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assert(Ts.count(o) == 0 && "Object already in set!");
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if (Cache) {
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assert(Cache != o && "Object already in set!");
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Ts.insert(Cache);
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}
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Cache = o;
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}
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void removeGarbage(const T* o) {
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if (o == Cache)
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Cache = nullptr; // Cache hit
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else
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Ts.erase(o);
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}
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bool hasGarbage(const std::string& Message) {
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addGarbage(nullptr); // Flush the Cache
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assert(!Cache && "No value should be cached anymore!");
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if (!Ts.empty()) {
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errs() << "Leaked " << Name << " objects found: " << Message << ":\n";
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for (typename SmallPtrSet<const T*, 8>::iterator I = Ts.begin(),
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E = Ts.end(); I != E; ++I) {
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errs() << '\t';
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PrinterTrait<T>::print(*I);
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errs() << '\n';
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}
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errs() << '\n';
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return true;
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}
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return false;
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}
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private:
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SmallPtrSet<const T*, 8> Ts;
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const T* Cache;
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const char* Name;
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};
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}
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#endif // LLVM_IR_LEAKSCONTEXT_H
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