64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// NOLINTBEGIN(cppcoreguidelines-no-malloc)
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#include "furvm/thing.hpp"
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#include "furvm/context.hpp" // IWYU pragma: keep
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#include <cstdlib>
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#include <cstring>
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#include <stdexcept>
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namespace furvm {
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std::size_t thing_type_size(thing_t type) {
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switch (type) {
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case thing_t::Int32: return 4;
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}
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return 0;
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}
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thing::thing(rzecz, thing_handle id, thing_t type, const context_p& context)
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: m_id(id), m_type(type), m_context(context) {
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std::size_t size = thing_type_size(type);
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std::byte* data = nullptr;
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if (!m_context->m_deadThings.empty()) {
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thing_t itType{};
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for (auto it = m_context->m_deadThings.rbegin(); it != m_context->m_deadThings.rend(); ++it) {
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std::memcpy(&itType, static_cast<std::byte*>(*it) - sizeof(itType), sizeof(itType));
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if (size == thing_type_size(itType)) {
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data = static_cast<std::byte*>(*it);
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break;
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}
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}
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}
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if (data == nullptr) data = m_context->m_thingArena.allocate<std::byte>(sizeof(type) + size);
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if (data == nullptr) throw std::runtime_error("failed to allocate data for new thing");
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std::memcpy(data, &type, sizeof(type));
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m_data = data + sizeof(type);
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std::memset(m_data, 0, size);
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}
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thing::~thing() {
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m_context->m_deadThings.push_back(m_data);
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}
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thing_p thing::create(const context_p& context, thing_t type) {
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auto th = std::make_shared<thing>(rzecz{}, context->m_things.size(), type, context);
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context->m_things.push_back(th);
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return std::move(th);
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}
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std::int32_t& thing::int32() {
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if (m_type != thing_t::Int32) throw bad_thing_access();
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return *static_cast<std::int32_t*>(m_data);
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}
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const std::int32_t& thing::int32() const {
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if (m_type != thing_t::Int32) throw bad_thing_access();
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return *static_cast<std::int32_t*>(m_data);
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}
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} // namespace furvm
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// NOLINTEND(cppcoreguidelines-no-malloc)
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