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blt-gp
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stack is still broken

thread
Brett 2024-08-17 00:06:28 -04:00
parent ac3bc8d10b
commit 96f9ded1c5
2 changed files with 141 additions and 32 deletions
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2
CMakeLists.txt
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@ -1,5 +1,5 @@
cmake_minimum_required(VERSION 3.25)
project(blt-gp VERSION 0.1.0)
project(blt-gp VERSION 0.1.1)
include(CTest)

171
include/blt/gp/stack.h
View File

@ -49,17 +49,70 @@ namespace blt::gp
template<typename T>
using NO_REF_T = std::remove_cv_t<std::remove_reference_t<T>>;
public:
struct size_data_t
{
blt::size_t total_size_bytes = 0;
blt::size_t total_used_bytes = 0;
blt::size_t total_remaining_bytes = 0;
blt::size_t total_no_meta_bytes = 0;
blt::size_t total_dealloc = 0;
blt::size_t total_dealloc_used = 0;
blt::size_t total_dealloc_remaining = 0;
blt::size_t total_dealloc_no_meta = 0;
blt::size_t blocks = 0;
friend std::ostream& operator<<(std::ostream& stream, const size_data_t& data)
{
stream << "[";
stream << data.total_used_bytes << "/";
stream << data.total_size_bytes << "(";
stream << (static_cast<double>(data.total_used_bytes) / static_cast<double>(data.total_size_bytes) * 100) << "%), ";
stream << data.total_used_bytes << "/";
stream << data.total_no_meta_bytes << "(";
stream << (static_cast<double>(data.total_used_bytes) / static_cast<double>(data.total_no_meta_bytes) * 100)
<< "%), (empty space: ";
stream << data.total_remaining_bytes << ") blocks: " << data.blocks << " || unallocated space: ";
stream << data.total_dealloc_used << "/";
stream << data.total_dealloc;
if (static_cast<double>(data.total_dealloc) > 0)
stream << "(" << (static_cast<double>(data.total_dealloc_used) / static_cast<double>(data.total_dealloc) * 100) << "%)";
stream << ", ";
stream << data.total_dealloc_used << "/";
stream << data.total_dealloc_no_meta;
if (data.total_dealloc_no_meta > 0)
stream << "(" << (static_cast<double>(data.total_dealloc_used) / static_cast<double>(data.total_dealloc_no_meta * 100))
<< "%)";
stream << ", (empty space: " << data.total_dealloc_remaining << ")]";
return stream;
}
};
template<typename T>
static inline constexpr blt::size_t aligned_size() noexcept
{
return aligned_size(sizeof(NO_REF_T<T>));
}
static inline constexpr blt::size_t aligned_size(blt::size_t size) noexcept
{
return (size + (MAX_ALIGNMENT - 1)) & ~(MAX_ALIGNMENT - 1);
}
stack_allocator() = default;
stack_allocator(const stack_allocator& copy)
{
if (copy.data_ == nullptr || copy.bytes_stored == 0)
return;
expand(copy.size_);
std::memcpy(data_, copy.data_, copy.used_index);
used_index = copy.used_index;
std::memcpy(data_, copy.data_, copy.bytes_stored);
bytes_stored = copy.bytes_stored;
}
stack_allocator(stack_allocator&& move) noexcept:
data_(std::exchange(move.data_, nullptr)), used_index(move.used_index), size_(move.size_)
data_(std::exchange(move.data_, nullptr)), bytes_stored(move.bytes_stored), size_(move.size_)
{}
stack_allocator& operator=(const stack_allocator& copy) = delete;
@ -68,7 +121,7 @@ namespace blt::gp
{
data_ = std::exchange(move.data_, data_);
size_ = std::exchange(move.size_, size_);
used_index = std::exchange(move.used_index, used_index);
bytes_stored = std::exchange(move.bytes_stored, bytes_stored);
return *this;
}
@ -79,31 +132,32 @@ namespace blt::gp
void insert(const stack_allocator& stack)
{
if (size_ < stack.used_index + used_index)
expand(stack.used_index + used_index);
std::memcpy(data_ + used_index, stack.data_, stack.used_index);
used_index += stack.used_index;
if (size_ < stack.bytes_stored + bytes_stored)
expand(stack.bytes_stored + bytes_stored);
std::memcpy(data_ + bytes_stored, stack.data_, stack.bytes_stored);
bytes_stored += stack.bytes_stored;
}
void copy_from(const stack_allocator& stack, blt::size_t bytes)
{
if (size_ < bytes + used_index)
expand(bytes + used_index);
std::memcpy(data_ + used_index, stack.data_ + (stack.used_index - bytes), bytes);
used_index += bytes;
BLT_ASSERT(stack.data_ != nullptr);
if (size_ < bytes + bytes_stored)
expand(bytes + bytes_stored);
std::memcpy(data_ + bytes_stored, stack.data_ + (stack.bytes_stored - bytes), bytes);
bytes_stored += bytes;
}
void copy_from(blt::u8* data, blt::size_t bytes)
{
if (size_ < bytes + used_index)
expand(bytes + used_index);
std::memcpy(data_ + used_index, data, bytes);
used_index += bytes;
if (size_ < bytes + bytes_stored)
expand(bytes + bytes_stored);
std::memcpy(data_ + bytes_stored, data, bytes);
bytes_stored += bytes;
}
void copy_to(blt::u8* data, blt::size_t bytes)
{
std::memcpy(data, data_ + (used_index - bytes), bytes);
std::memcpy(data, data_ + (bytes_stored - bytes), bytes);
}
template<typename T, typename NO_REF = NO_REF_T<T>>
@ -122,8 +176,8 @@ namespace blt::gp
static_assert(alignof(NO_REF) <= MAX_ALIGNMENT && "Type alignment must not be greater than the max alignment!");
constexpr auto size = aligned_size(sizeof(NO_REF));
T t;
std::memcpy(&t, data_ + used_index - size, size);
used_index -= size;
std::memcpy(&t, data_ + bytes_stored - size, size);
bytes_stored -= size;
}
template<typename T, typename NO_REF = NO_REF_T<T>>
@ -131,25 +185,65 @@ namespace blt::gp
{
static_assert(std::is_trivially_copyable_v<NO_REF> && "Type must be bitwise copyable!");
static_assert(alignof(NO_REF) <= MAX_ALIGNMENT && "Type alignment must not be greater than the max alignment!");
constexpr auto size = aligned_size(sizeof(NO_REF)) + bytes;
return *reinterpret_cast<NO_REF*>(data_ + used_index - size);
auto size = aligned_size(sizeof(NO_REF)) + bytes;
return *reinterpret_cast<NO_REF*>(data_ + bytes_stored - size);
}
void pop_bytes(blt::size_t bytes)
{
bytes_stored -= bytes;
}
void transfer_bytes(stack_allocator& to, blt::size_t bytes)
{
to.copy_from(*this, bytes);
pop_bytes(bytes);
}
template<typename... Args>
void call_destructors(detail::bitmask_t* mask)
{
if constexpr (sizeof...(Args) > 0)
{
blt::size_t offset = (stack_allocator::aligned_size(sizeof(NO_REF_T<Args>)) + ...) -
stack_allocator::aligned_size(sizeof(NO_REF_T<typename blt::meta::arg_helper<Args...>::First>));
blt::size_t index = 0;
if (mask != nullptr)
index = mask->size() - sizeof...(Args);
((call_drop<Args>(offset, index, mask), offset -= stack_allocator::aligned_size(sizeof(NO_REF_T<Args>)), ++index), ...);
if (mask != nullptr)
{
auto& mask_r = *mask;
for (blt::size_t i = 0; i < sizeof...(Args); i++)
mask_r.pop_back();
}
}
}
[[nodiscard]] bool empty() const noexcept
{
return used_index == 0;
return bytes_stored == 0;
}
[[nodiscard]] blt::size_t remaining_bytes_in_block() const noexcept
[[nodiscard]] blt::ptrdiff_t remaining_bytes_in_block() const noexcept
{
return size_ - used_index;
return static_cast<blt::ptrdiff_t>(size_ - bytes_stored);
}
static inline constexpr blt::size_t aligned_size(blt::size_t size) noexcept
[[nodiscard]] blt::ptrdiff_t bytes_in_head() const noexcept
{
return (size + (MAX_ALIGNMENT - 1)) & ~(MAX_ALIGNMENT - 1);
return static_cast<blt::ptrdiff_t>(bytes_stored);
}
[[nodiscard]] size_data_t size() const noexcept
{
size_data_t data;
data.total_used_bytes = bytes_stored;
data.total_size_bytes = size_;
data.total_remaining_bytes = remaining_bytes_in_block();
return data;
}
private:
@ -157,8 +251,8 @@ namespace blt::gp
{
bytes = to_nearest_page_size(bytes);
auto new_data = static_cast<blt::u8*>(std::malloc(bytes));
if (used_index > 0)
std::memcpy(new_data, data_, used_index);
if (bytes_stored > 0)
std::memcpy(new_data, data_, bytes_stored);
std::free(data_);
data_ = new_data;
size_ = bytes;
@ -175,7 +269,7 @@ namespace blt::gp
if (data_ == nullptr)
return nullptr;
blt::size_t remaining_bytes = remaining_bytes_in_block();
auto* pointer = static_cast<void*>(data_ + used_index);
auto* pointer = static_cast<void*>(data_ + bytes_stored);
return std::align(MAX_ALIGNMENT, bytes, pointer, remaining_bytes);
}
@ -191,13 +285,28 @@ namespace blt::gp
throw std::bad_alloc();
// TODO: this whole process could be better
auto used_bytes = static_cast<blt::size_t>(std::abs(data_ - static_cast<blt::u8*>(aligned_ptr)));
used_index += used_bytes;
bytes_stored += used_bytes;
return aligned_ptr;
}
template<typename T>
inline void call_drop(blt::size_t offset, blt::size_t index, detail::bitmask_t* mask)
{
if constexpr (detail::has_func_drop_v<T>)
{
if (mask != nullptr)
{
auto& mask_r = *mask;
if (!mask_r[index])
return;
}
from<NO_REF_T<T>>(offset).drop();
}
}
blt::u8* data_ = nullptr;
// place in the data_ array which has a free spot.
blt::size_t used_index = 0;
blt::size_t bytes_stored = 0;
blt::size_t size_ = 0;
};