Removed rust version from master

Fortune for libcow's current commit: Future small blessing − 末小吉

.gitignore

@@ -4,3 +4,5 @@ cow-*
 obj/
 *~
 vgcore.*
+target/
+!cowslice/*.a

Makefile

@@ -5,7 +5,7 @@ PROJECT=cow
 AUTHOR=Avril (Flanchan) <flanchan@cumallover.me>
 
 VERSION_MAJOR=0
-VERSION_MINOR=2.0
+VERSION_MINOR=3.0
 VERSION=$(VERSION_MAJOR).$(VERSION_MINOR)
 
 ifeq ($(PREFIX),)

include/cow.h

@@ -35,6 +35,13 @@ typedef struct cow_mapped_slice cow_t;
 /// Writes to this instance pointer (`cow_ptr()`) are written to the allocated memory.
 /// Writes to any cloned instances do not propagate to this instance.
 cow_t* cow_create(size_t size);
+/// Create a new copy-on-write area of `size` bytes from file `fd`. 
+/// Writes to this instance pointer (`cow_ptr()`) are written to the allocated memory.
+/// Writes to any cloned instances do not propagate to this instance.
+///
+/// The resulting object does not own `fd`, but does own a duplicate of it.
+cow_t* cow_create_fd(int fd, size_t size);
+
 /// Free a cow area. This should be called on all clones before the parent of those clones is freed.
 void cow_free(cow_t* restrict cow);
 /// Create a clone of this instance. Any writes to the returned pointer will not be propagated to the input one.

include/cow.hpp

@@ -21,7 +21,9 @@ struct Cow : public _cow_util::Span<unsigned char> {
 	struct Fake;
 	Cow() = delete;
 
+	Cow(int fd, size_t size);
 	explicit Cow(size_t size);
+
 	Cow(Cow&& m);
 	virtual ~Cow();
 

include/cow/typed.hpp

@@ -3,10 +3,68 @@
 #include <cow.hpp>
 #include <utility>
 
-XXX: Fuck this. Rewrite to use composition. Inheritance is a comlpete joke.
+template<typename T>
+struct TypedCow : public _cow_util::Span<T> {
+	struct Fake;
+
+	template<typename... Args>
+	inline TypedCow(size_t sz, Args&&... args) : real(Cow(sz * sizeof(T))) { init_copy( T(std::forward<Args>(args)...) ); }
+	inline TypedCow(size_t sz, const T& copy) : real(Cow(sz * sizeof(T))) { init_copy(copy); }
+	inline TypedCow(size_t sz) : TypedCow(sz, T()){}
+
+	inline virtual ~TypedCow() { uninit(); }
+
+	inline virtual Fake clone() const { return Fake(*this); }
+
+	inline virtual cow_t* raw() const { return real.raw(); }
+
+	inline size_t size() const { return real.size() / sizeof(T); }
+	protected:
+	//inline explicit TypedCow(const TypedCow<T>& unsafeCopy) : real(Cow(unsafeCopy.real)){}
+
+	inline virtual void* area() override { return reinterpret_cast<void*>( real.ptr() ); }
+	inline virtual const void* area() const override { return reinterpret_cast<const void*>( real.ptr() ); }
+
+	inline void init_copy(const T& copy_from) {
+		T* ptr = this->ptr();
+		for(size_t i=0;i<size();i++)
+			new ((void*)(ptr+i)) T(copy_from);
+
+	}
+	// UNSAFE: Explicitly calls destructors of each element in this instance.
+	inline void uninit() {
+		T* ptr = this->ptr();
+		if(!ptr) return;
 
+		for(size_t i=0;i<size();i++)
+			(ptr+i)->~T();
+	}
+	private:
+	Cow real;
+};
 template<typename T>
-struct TypedCow : private Cow, public _cow_util::Span<T> {
+struct TypedCow<T>::Fake : public TypedCow<T>  {
+//XXX: How THE FUCK do we initialise base's `real` here?????
+	Fake() = delete;
+
+	inline Fake(const Fake& copy) : fake(cow_clone(copy.fake)){}
+	inline Fake(Fake&& move) : fake(move.fake) { *const_cast<cow_t**>(&move.fake) = nullptr; }
+	inline Fake(const TypedCow<T>& clone) : fake(cow_clone(clone.raw())){}
+
+	inline cow_t* raw() const override { return fake; }
+	inline Fake clone() const override { return Fake(*this); }
+
+	inline ~Fake(){}
+
+	inline size_t size() const override { return fake ? cow_size(fake) : 0; }
+	protected:
+	inline void* area() override { return fake ? cow_ptr(fake) : nullptr; }
+	inline const void* area() const override { return fake ? cow_ptr_of(const void, fake) : nullptr; }
+	
+	private:
+	cow_t* const fake;
+};
+#if 0
 	struct Fake;
 	friend class Fake;
 
@@ -16,8 +74,8 @@ struct TypedCow : private Cow, public _cow_util::Span<T> {
 	
 	inline TypedCow(size_t sz) : Cow(sz * sizeof(T)) { init_copy(T()); }
 	inline TypedCow(size_t sz, const T& copy_from) : TypedCow(sz) { init_copy(copy_from); }
-	template<typename... Args>
+	//template<typename... Args>
-	inline TypedCow(size_t sz, Args&&... args) : TypedCow(sz) { init_copy( T(std::forward<Args>(args)...) ); }
+	//inline TypedCow(size_t sz, Args&&... args) : TypedCow(sz) { init_copy( T(std::forward<Args>(args)...) ); }
 
 	virtual inline ~TypedCow() { uninit(); }
 
@@ -60,3 +118,4 @@ struct TypedCow<T>::Fake : private Cow::Fake, public _cow_util::Span<T> {
 	inline const void* area() const override { return Cow::Fake::area(); }
 	inline void* area() override { return Cow::Fake::area(); }
 };
+#endif

src/cow.c

@@ -76,13 +76,13 @@ size_t cow_size(const cow_t* cow)
 	return cow->size;
 }
 
-inline internal cow_t _cow_create_unboxed(size_t size)
+inline internal cow_t _cow_create_unboxed(int _fd, size_t size)
 {
 	cow_t ret;
 
 	ret.size = size;
 	if( (ret.poisoned = 
-		((ret.fd = shm_fd(size)) == -1))
+		((ret.fd = _fd < 0 ? shm_fd(size) : _fd) == -1))
 	) {
 		ret.origin = NULL;
 		return ret;
@@ -96,7 +96,14 @@ inline internal cow_t _cow_create_unboxed(size_t size)
 }
 cow_t* cow_create(size_t size)
 {	
-	return box_value(_cow_create_unboxed(size));
+	return box_value(_cow_create_unboxed(-1, size));
+}
+
+cow_t* cow_create_fd(int fd, size_t size)
+{
+	fd = dup(fd);
+	if(__builtin_expect(fd < 0, false)) return NULL;
+	return box_value(_cow_create_unboxed(fd, size));
 }
 
 inline internal void _cow_free_unboxed(const cow_t* cow)

src/cow.cpp

@@ -15,6 +15,7 @@ struct Cow::_inner {
 
 	~_inner();
 	_inner(size_t sz);
+	_inner(int fd, size_t sz);
 	_inner(cow_t* ptr);
 
 	_inner(const _inner& copy) = delete;
@@ -27,10 +28,12 @@ Cow::_inner::~_inner() {
 	_cow_free_unboxed(ptr());
 	cow.poisoned=true;
 }
-Cow::_inner::_inner(size_t sz) : cow(_cow_create_unboxed(sz)){
+Cow::_inner::_inner(int fd, size_t sz) : cow(_cow_create_unboxed(fd, sz)){
 	
 	if(UNLIKELY(cow.poisoned)) throw CowException(cow_err());
 }
+Cow::_inner::_inner(size_t sz) : _inner(-1, sz) {}
+
 Cow::_inner::_inner(cow_t* ptr) : cow(*ptr)
 {
 	free(ptr);
@@ -38,6 +41,7 @@ Cow::_inner::_inner(cow_t* ptr) : cow(*ptr)
 }
 
 Cow::Cow(size_t size) : super(std::make_shared<_inner>(size)){}
+Cow::Cow(int fd, size_t size) : super(std::make_shared<_inner>(fd, size)){}
 Cow::Cow(cow_t* raw) : super(std::make_shared<_inner>(raw)){}
 
 Cow::Cow(Cow&& m) : super(std::move(*const_cast<std::shared_ptr<_inner>*>(&m.super))){}

src/cow_t.h

@@ -44,7 +44,7 @@ _Static_assert
 		(offsetof(cow_t, size) == sizeof(void*), "`cow_t.size` should have an offset equal to `sizeof(void*)` or cow_size_unsafe() becomes UB.");
 #endif
 
-cow_t _cow_create_unboxed(size_t size) internal;
+cow_t _cow_create_unboxed(int rfd, size_t size) internal;
 void _cow_free_unboxed(const cow_t* cow) internal;
 
 #ifdef __cplusplus