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Make RefCounted work with dynamic arrays

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This commit is contained in:
Eugen Wissner 2017-04-16 20:14:04 +02:00
parent 7aa9ac9f4a
commit 628153e2e8
1 changed files with 136 additions and 97 deletions
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191
source/tanya/memory/types.d
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@ -14,34 +14,16 @@ import core.exception;
import std.algorithm.comparison;
import std.algorithm.mutation;
import std.conv;
import std.range;
import std.traits;
import tanya.memory;
/**
* Reference-counted object containing a $(D_PARAM T) value as payload.
* $(D_PSYMBOL RefCounted) keeps track of all references of an object, and
* when the reference count goes down to zero, frees the underlying store.
*
* Params:
* T = Type of the reference-counted value.
*/
struct RefCounted(T)
package(tanya) final class RefCountedStore(T)
{
static if (is(T == class) || is(T == interface))
{
private alias Payload = T;
}
else
{
private alias Payload = T*;
}
T payload;
size_t counter = 1;
private class Storage
{
private Payload payload;
private size_t counter = 1;
private final size_t opUnary(string op)() pure nothrow @safe @nogc
size_t opUnary(string op)()
if (op == "--" || op == "++")
in
{
@ -52,7 +34,7 @@ struct RefCounted(T)
mixin("return " ~ op ~ "counter;");
}
private final int opCmp(size_t counter) const pure nothrow @safe @nogc
int opCmp(size_t counter)
{
if (this.counter > counter)
{
@ -68,37 +50,55 @@ struct RefCounted(T)
}
}
private final int opEquals(size_t counter) const pure nothrow @safe @nogc
int opEquals(size_t counter)
{
return this.counter == counter;
}
}
private final class RefCountedStorage : Storage
private void separateDeleter(T)(RefCountedStore!T storage,
shared Allocator allocator)
{
private shared Allocator allocator;
this(shared Allocator allocator) pure nothrow @safe @nogc
in
{
assert(allocator !is null);
}
body
{
this.allocator = allocator;
allocator.dispose(storage.payload);
allocator.dispose(storage);
}
~this() nothrow @nogc
private void unifiedDeleter(T)(RefCountedStore!T storage,
shared Allocator allocator)
{
allocator.dispose(payload);
auto ptr1 = finalize(storage);
auto ptr2 = finalize(storage.payload);
allocator.deallocate(ptr1.ptr[0 .. ptr1.length + ptr2.length]);
}
/**
* Reference-counted object containing a $(D_PARAM T) value as payload.
* $(D_PSYMBOL RefCounted) keeps track of all references of an object, and
* when the reference count goes down to zero, frees the underlying store.
*
* Params:
* T = Type of the reference-counted value.
*/
struct RefCounted(T)
{
static if (is(T == class) || is(T == interface) || isArray!T)
{
private alias Payload = T;
}
else
{
private alias Payload = T*;
}
private alias Storage = RefCountedStore!Payload;
private Storage storage;
private void function(Storage storage,
shared Allocator allocator) @nogc deleter;
invariant
{
assert(storage is null || allocator_ !is null);
assert(storage is null || deleter !is null);
}
/**
@ -112,11 +112,13 @@ struct RefCounted(T)
*
* Precondition: $(D_INLINECODE allocator !is null)
*/
this(Payload value, shared Allocator allocator = defaultAllocator)
this()(auto ref Payload value,
shared Allocator allocator = defaultAllocator)
{
this(allocator);
storage = allocator.make!RefCountedStorage(allocator);
move(value, storage.payload);
this.storage = allocator.make!Storage();
this.deleter = &separateDeleter!Payload;
move(value, this.storage.payload);
}
/// Ditto.
@ -148,9 +150,9 @@ struct RefCounted(T)
*/
~this()
{
if (storage !is null && !(storage.counter && --storage))
if (this.storage !is null && !(this.storage.counter && --this.storage))
{
allocator_.dispose(storage);
deleter(storage, allocator);
}
}
@ -170,54 +172,48 @@ struct RefCounted(T)
* Params:
* rhs = $(D_KEYWORD this).
*/
ref typeof(this) opAssign(Payload rhs)
ref typeof(this) opAssign()(auto ref Payload rhs)
{
if (storage is null)
if (this.storage is null)
{
storage = allocator.make!RefCountedStorage(allocator);
this.storage = allocator.make!Storage();
this.deleter = &separateDeleter!Payload;
}
else if (storage > 1)
else if (this.storage > 1)
{
--storage;
storage = allocator.make!RefCountedStorage(allocator);
}
else if (cast(RefCountedStorage) storage is null)
{
// Created with refCounted. Always destroyed togethter with the pointer.
assert(storage.counter != 0);
allocator.dispose(storage);
storage = allocator.make!RefCountedStorage(allocator);
--this.storage;
this.storage = allocator.make!Storage();
this.deleter = &separateDeleter!Payload;
}
else
{
allocator.dispose(storage.payload);
// Created with refCounted. Always destroyed togethter with the pointer.
assert(this.storage.counter != 0);
finalize(this.storage.payload);
this.storage.payload = Payload.init;
}
move(rhs, storage.payload);
move(rhs, this.storage.payload);
return this;
}
/// Ditto.
ref typeof(this) opAssign(typeof(null))
{
if (storage is null)
if (this.storage is null)
{
return this;
}
else if (storage > 1)
else if (this.storage > 1)
{
--storage;
storage = null;
}
else if (cast(RefCountedStorage) storage is null)
{
// Created with refCounted. Always destroyed togethter with the pointer.
assert(storage.counter != 0);
allocator.dispose(storage);
return this;
--this.storage;
this.storage = null;
}
else
{
allocator.dispose(storage.payload);
// Created with refCounted. Always destroyed togethter with the pointer.
assert(this.storage.counter != 0);
finalize(this.storage.payload);
this.storage.payload = Payload.init;
}
return this;
}
@ -225,8 +221,9 @@ struct RefCounted(T)
/// Ditto.
ref typeof(this) opAssign(typeof(this) rhs)
{
swap(allocator_, rhs.allocator_);
swap(storage, rhs.storage);
swap(this.allocator_, rhs.allocator_);
swap(this.storage, rhs.storage);
swap(this.deleter, rhs.deleter);
return this;
}
@ -380,15 +377,22 @@ private unittest
* args = Constructor arguments of $(D_PARAM T).
*
* Returns: Newly created $(D_PSYMBOL RefCounted!T).
*
* Precondition: $(D_INLINECODE allocator !is null)
*/
RefCounted!T refCounted(T, A...)(shared Allocator allocator, auto ref A args)
if (!is(T == interface) && !isAbstractClass!T
&& !isArray!T && !isAssociativeArray!T)
&& !isAssociativeArray!T && !isArray!T)
in
{
assert(allocator !is null);
}
body
{
auto rc = typeof(return)(allocator);
immutable storageSize = alignedSize(stateSize!(RefCounted!T.Storage));
immutable size = alignedSize(stateSize!T + storageSize);
const storageSize = alignedSize(stateSize!(RefCounted!T.Storage));
const size = alignedSize(stateSize!T + storageSize);
auto mem = (() @trusted => allocator.allocate(size))();
if (mem is null)
@ -399,7 +403,7 @@ RefCounted!T refCounted(T, A...)(shared Allocator allocator, auto ref A args)
{
() @trusted { allocator.deallocate(mem); }();
}
rc.storage = emplace!(RefCounted!T.Storage)(mem[0 .. storageSize]);
rc.storage = emplace!((RefCounted!T.Storage))(mem[0 .. storageSize]);
static if (is(T == class))
{
@ -410,9 +414,38 @@ RefCounted!T refCounted(T, A...)(shared Allocator allocator, auto ref A args)
auto ptr = (() @trusted => (cast(T*) mem[storageSize .. $].ptr))();
rc.storage.payload = emplace!T(ptr, args);
}
rc.deleter = &unifiedDeleter!(RefCounted!T.Payload);
return rc;
}
/**
* Constructs a new array with $(D_PARAM size) elements and wraps it in a
* $(D_PSYMBOL RefCounted) using.
*
* Params:
* T = Array type.
* size = Array size.
* allocator = Allocator.
*
* Returns: Newly created $(D_PSYMBOL RefCounted!T).
*
* Precondition: $(D_INLINECODE allocator !is null
* && size <= size_t.max / ElementType!T.sizeof)
*/
RefCounted!T refCounted(T)(shared Allocator allocator, const size_t size)
if (isArray!T)
in
{
assert(allocator !is null);
assert(size <= size_t.max / ElementType!T.sizeof);
}
body
{
auto payload = cast(T) allocator.allocate(ElementType!T.sizeof * size);
initializeAll(payload);
return RefCounted!T(payload, allocator);
}
///
unittest
{
@ -456,3 +489,9 @@ private @nogc unittest
assert(rc.count);
}
}
private @nogc unittest
{
auto rc = defaultAllocator.refCounted!(int[])(5);
assert(rc.length == 5);
}