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103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
#ifndef safe_ptr_hh_INCLUDED
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#define safe_ptr_hh_INCLUDED
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// #define SAFE_PTR_TRACK_CALLSTACKS
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#include "assert.hh"
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#include "ref_ptr.hh"
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#include <type_traits>
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#include <utility>
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#ifdef SAFE_PTR_TRACK_CALLSTACKS
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#include "backtrace.hh"
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#include "vector.hh"
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#include <algorithm>
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#endif
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namespace Kakoune
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{
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// *** SafePtr: objects that assert nobody references them when they die ***
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class SafeCountable
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{
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public:
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#ifdef KAK_DEBUG
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SafeCountable() {}
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~SafeCountable()
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{
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kak_assert(m_count == 0);
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#ifdef SAFE_PTR_TRACK_CALLSTACKS
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kak_assert(m_callstacks.empty());
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#endif
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}
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SafeCountable(const SafeCountable&) {}
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SafeCountable(SafeCountable&&) {}
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SafeCountable& operator=(const SafeCountable& other) { return *this; }
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SafeCountable& operator=(SafeCountable&& other) { return *this; }
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private:
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friend struct SafeCountablePolicy;
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#ifdef SAFE_PTR_TRACK_CALLSTACKS
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struct Callstack
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{
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Callstack(void* p) : ptr(p) {}
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void* ptr;
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Backtrace bt;
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};
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mutable Vector<Callstack> m_callstacks;
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#endif
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mutable int m_count = 0;
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#endif
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};
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struct SafeCountablePolicy
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{
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#ifdef KAK_DEBUG
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static void inc_ref(const SafeCountable* sc, void* ptr) noexcept
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{
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++sc->m_count;
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#ifdef SAFE_PTR_TRACK_CALLSTACKS
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sc->m_callstacks.emplace_back(ptr);
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#endif
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}
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static void dec_ref(const SafeCountable* sc, void* ptr) noexcept
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{
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--sc->m_count;
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kak_assert(sc->m_count >= 0);
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#ifdef SAFE_PTR_TRACK_CALLSTACKS
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auto it = std::find_if(sc->m_callstacks.begin(), sc->m_callstacks.end(),
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[=](const SafeCountable::Callstack& cs) { return cs.ptr == ptr; });
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kak_assert(it != sc->m_callstacks.end());
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sc->m_callstacks.erase(it);
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#endif
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}
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static void ptr_moved(const SafeCountable* sc, void* from, void* to) noexcept
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{
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#ifdef SAFE_PTR_TRACK_CALLSTACKS
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auto it = std::find_if(sc->m_callstacks.begin(), sc->m_callstacks.end(),
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[=](const SafeCountable::Callstack& cs) { return cs.ptr == from; });
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kak_assert(it != sc->m_callstacks.end());
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it->ptr = to;
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#endif
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}
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#else
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static void inc_ref(const SafeCountable*, void* ptr) noexcept {}
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static void dec_ref(const SafeCountable*, void* ptr) noexcept {}
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static void ptr_moved(const SafeCountable*, void*, void*) noexcept {}
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#endif
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};
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template<typename T>
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using SafePtr = RefPtr<T, SafeCountablePolicy>;
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}
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#endif // safe_ptr_hh_INCLUDED
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