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#include "memorystore.hpp"
#include "concept.hpp"
#include "errors.hpp"
#include "ref.hpp"
#include <memory>
#include <unordered_map>
namespace intellect {
namespace level0 {
static auto & index()
{
static std::unordered_map<ref, std::unique_ptr<concept>, std::hash<concept*>> index;
return index;
}
namespace concepts {
ref allocator() { static ref ret = basic_alloc(); return ret; };
ref allocates() { static ref ret = basic_alloc(); return ret; };
ref allocations() { static ref ret = basic_alloc(); return ret; };
ref level0allocations() { static ref ret = basic_alloc(); return ret; };
}
struct init { init()
{
concepts::allocator().link(concepts::allocator(), concepts::level0allocations());
concepts::level0allocations().link(concepts::allocates(), concepts::allocator());
concepts::allocates().link(concepts::allocator(), concepts::level0allocations());
concepts::level0allocations().link(concepts::allocates(), concepts::allocates());
concepts::allocations().link(concepts::allocator(), concepts::level0allocations());
concepts::level0allocations().link(concepts::allocates(), concepts::allocations());
concepts::level0allocations().link(concepts::allocator(), concepts::level0allocations());
concepts::level0allocations().link(concepts::allocates(), concepts::level0allocations());
} } _init;
ref basic_alloc(std::any data)
{
ref r = new concept();
r.ptr()->data = data;
index().emplace(r, r.ptr());
return r;
}
ref alloc(ref source, std::any data)
{
ref r = basic_alloc(data);
alloc(r, source);
return r;
}
void alloc(ref r, ref source)
{
r.link(concepts::allocator(), source);
source.link(concepts::allocates(), r);
}
void realloc(ref r, ref newsource)
{
ref oldsource = r.get(concepts::allocator());
alloc(r, newsource);
dealloc(r, oldsource);
}
static concept* referenced(ref r, concept* source = 0) {
for (auto & r2pair : index()) {
ref r2 = r2pair.first;
if (r2.ptr() == source) {
continue;
}
if (r2 == r) {
continue;
}
for (auto & l : r2.links()) {
if (ref(l.first) == r) {
return r2;
}
if (ref(l.second) == r) {
return r2;
}
}
}
return 0;
}
void basic_dealloc(ref r)
{
auto it = index().find(r);
if (it == index().end()) { throw no_such_concept(r); }
concept * referenced = intellect::level0::referenced(r);
if (referenced) {
throw still_referenced_by(r, referenced);
}
index().erase(it);
}
void dealloc_from(ref source)
{
std::remove_reference<decltype(index())>::type forgotten;
auto ours = source.getAll(concepts::allocates());
for (auto allocation : ours) {
source.unlink(concepts::allocates(), allocation);
allocation.unlink(concepts::allocator(), source);
if (allocation.linked(concepts::allocator())) { continue; }
auto it = index().find(allocation);
if (it != index().end()) {
forgotten.insert(index().extract(it));
}
}
try {
for (auto allocation : ours ) {
if (allocation.linked(concepts::allocates())) {
dealloc_from(allocation);
}
}
for (auto ghost : ours) {
concept * referenced = intellect::level0::referenced(ghost, source);
if (referenced) {
throw still_referenced_by(ghost, referenced);
}
}
} catch(...) {
// NOTE: this doesn't rebuild deallocated subgroups, but that could be done
// by returning them.
index().merge(forgotten);
for (auto allocation : ours) {
source.link(concepts::allocates(), allocation);
allocation.link(concepts::allocator(), source);
}
throw;
}
// concepts in forgotten will be deallocated when they leave scope
// note: scoped allocation is just a plan to forget (at the end of a { } block)
}
void dealloc(ref r, ref source)
{
auto it = index().find(r);
if (it == index().end()) { throw no_such_concept(r); }
source.unlink(concepts::allocates(), r);
r.unlink(concepts::allocator(), source);
if (r.linked(concepts::allocator())) { return; }
try {
dealloc_from(r);
concept * referenced = intellect::level0::referenced(r, source);
if (referenced) {
throw still_referenced_by(r, referenced);
}
index().erase(it);
} catch(...) {
source.link(concepts::allocates(), r);
r.link(concepts::allocator(), source);
}
}
std::size_t allocated()
{
return index().size();
}
}
}
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