304 lines
11 KiB
C++
304 lines
11 KiB
C++
#include "furvm/executor.hpp"
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#include "furvm/context.hpp" // IWYU pragma: keep
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#include "furvm/exceptions.hpp"
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#include "furvm/function.hpp" // IWYU pragma: keep
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#include "furvm/fwd.hpp"
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#include "furvm/instruction.hpp"
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#include "furvm/thing.hpp"
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#include <cassert>
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#include <cstdint>
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#include <stdexcept>
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#include <vector>
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namespace furvm {
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thing_type executor::thing_type_impl(mod_h mod, mod_type type) const {
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while (type.type == mod_type::Import) {
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auto imprt = std::move(type.value.imprt);
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mod = m_context->at(imprt.modId);
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type = *mod->type_at(imprt.typeId);
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}
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switch (static_cast<enum thing_type::type>(type.type)) {
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case thing_type::S8:
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case thing_type::S16:
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case thing_type::S32:
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case thing_type::S64:
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case thing_type::U8:
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case thing_type::U16:
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case thing_type::U32:
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case thing_type::U64: return { static_cast<enum thing_type::type>(type.type) };
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case thing_type::Ptr: return { thing_type::Ptr, thing_type(mod, *mod->type_at(type.value.typeRef)) };
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case thing_type::Array: {
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return { static_cast<enum thing_type::type>(type.type),
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{ thing_type(mod, *mod->type_at(type.value.array.typeId)), type.value.array.size } };
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}
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default: throw std::runtime_error("invalid thing type");
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}
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}
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thing_type* executor::thing_type(const mod_h& mod, const mod_type& type) const {
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struct thing_type thingType = thing_type_impl(mod, type);
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return m_context->thing_type_store().insert(thingType);
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}
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void executor::push_frame(const mod_h& mod, function function) {
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mod_h modInst = mod;
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while (function.type() == function_t::Import) {
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modInst = m_context->at(function.imp().mod);
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function = *modInst->function_at(function.imp().function);
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}
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auto signature = function.signature();
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std::vector<thing_h> args;
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args.reserve(signature.params.size());
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for (const auto& param : signature.params) {
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auto arg = pop_thing();
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if (arg->type() != *thing_type(mod, *param)) throw std::runtime_error("function argument type mismatch");
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args.push_back(std::move(arg));
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}
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switch (function.type()) {
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case function_t::Normal: {
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m_frames.emplace((struct executor::frame){ mod, function.position(), m_stack.size(), std::move(args) });
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} break;
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case function_t::Native: {
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m_frames.emplace((struct executor::frame){ mod, 0, m_stack.size(), std::move(args) });
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modInst->get_native_function(function.native())(*this);
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m_frames.pop();
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} break;
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default: throw std::runtime_error("unexpected function type");
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}
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}
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struct executor::frame executor::pop_frame() {
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if (m_frames.empty()) throw stack_underflow();
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struct executor::frame frame = m_frames.top();
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m_frames.pop();
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return frame;
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}
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struct executor::frame executor::frame() const {
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return m_frames.top();
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}
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thing_h executor::push_thing(::furvm::thing<>&& thing) {
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return m_stack.emplace(m_context->emplace_thing(std::move(thing)));
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}
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thing_h executor::pop_thing() {
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if (m_frames.top().stackBase >= m_stack.size()) throw stack_underflow();
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thing_h top = std::move(m_stack.top());
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m_stack.pop();
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return top;
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}
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thing_h executor::thing() const {
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if (m_frames.top().stackBase >= m_stack.size()) throw stack_underflow();
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return m_stack.top();
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}
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void executor::store_thing(variable_t variable, const thing_h& thing) {
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auto& frame = m_frames.top();
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if (frame.variables.size() <= variable) frame.variables.resize(variable + 1);
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frame.variables[variable] = thing;
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}
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void executor::store_thing(variable_t variable, thing_h&& thing) {
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auto& frame = m_frames.top();
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if (frame.variables.size() <= variable) frame.variables.resize(variable + 1);
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frame.variables[variable] = std::move(thing);
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}
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thing_h executor::load_thing(variable_t variable) const {
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const auto& frame = m_frames.top();
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return frame.variables[variable];
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}
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void executor::step() {
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if ((m_flags & executor_flags::Suspended) == executor_flags::Suspended) return;
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struct frame& frame = m_frames.top();
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instruction_t instr = static_cast<instruction_t>((*frame.mod).byte(frame.position++));
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switch (instr) {
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case instruction_t::NoOperation: break;
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case instruction_t::PushB2I: {
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push_thing({ (struct thing_type){ thing_type::S32 }, m_context->thing_alloc() })->get<int>() =
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frame.mod->byte(frame.position++);
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} break;
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case instruction_t::Array: {
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mod_type_id typeId = static_cast<mod_type_id>(frame.mod->byte(frame.position)) |
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(static_cast<mod_type_id>(frame.mod->byte(frame.position + 1)) << 8) |
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(static_cast<mod_type_id>(frame.mod->byte(frame.position + 2)) << 16) |
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(static_cast<mod_type_id>(frame.mod->byte(frame.position + 3)) << 24);
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frame.position += 4;
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const auto& type = *thing_type(frame.mod, *frame.mod->type_at(typeId));
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if (type.type != thing_type::Array || type.value.array.type == nullptr || type.value.array.type == &type)
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throw std::runtime_error("invalid array type");
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auto array = push_thing({ type, m_context->thing_alloc() });
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if (type.value.array.size == 0) {
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auto sizeThing = pop_thing();
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std::int64_t size = sizeThing->integer();
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array->resize(size);
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}
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push_thing(std::move(array));
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} break;
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case instruction_t::Get: {
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auto index = pop_thing();
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auto array = pop_thing();
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push_thing(array->at(index->integer()));
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} break;
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case instruction_t::Drop: {
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pop_thing();
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} break;
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case instruction_t::Duplicate: {
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push_thing(thing());
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} break;
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case instruction_t::Clone: {
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push_thing(std::move(thing()->clone()));
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} break;
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case instruction_t::Reference: {
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auto thing = pop_thing();
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push_thing({ (struct thing_type){ thing_type::Ref, m_context->thing_type_store().insert(thing->type()) },
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m_context->thing_alloc() })
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->reference(*thing);
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} break;
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case instruction_t::Add: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->add(*rhs));
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} break;
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case instruction_t::Sub: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->sub(*rhs));
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} break;
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case instruction_t::Mul: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->mul(*rhs));
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} break;
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case instruction_t::Div: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->div(*rhs));
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} break;
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case instruction_t::Mod: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->mod(*rhs));
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} break;
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case instruction_t::Equals: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->equals(*rhs));
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} break;
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case instruction_t::NotEquals: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->not_equals(*rhs));
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} break;
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case instruction_t::LessThan: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->less_than(*rhs));
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} break;
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case instruction_t::GreaterThan: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->greater_than(*rhs));
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} break;
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case instruction_t::LessEqual: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->less_equals(*rhs));
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} break;
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case instruction_t::GreaterEqual: {
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auto rhs = pop_thing();
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auto lhs = pop_thing();
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push_thing(lhs->greater_equals(*rhs));
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} break;
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case instruction_t::Pointerof: {
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auto thing = pop_thing();
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auto ptr =
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push_thing({ (struct thing_type){ thing_type::Ptr, m_context->thing_type_store().at(thing->type().id) },
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m_context->thing_alloc() });
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ptr->get<void*>() = thing->raw();
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} break;
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case instruction_t::Sizeof: {
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auto thing = pop_thing();
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auto size = push_thing({ (struct thing_type){ thing_type::U64 }, m_context->thing_alloc() });
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switch (thing->type().type) {
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case thing_type::S8:
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case thing_type::S16:
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case thing_type::S32:
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case thing_type::S64:
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case thing_type::U8:
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case thing_type::U16:
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case thing_type::U32:
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case thing_type::U64:
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size->get<thing_type::u64>() = static_cast<thing_type::u64>(thing_type::primitive_size(thing->type().type));
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break;
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case thing_type::Ptr: size->get<thing_type::u64>() = static_cast<thing_type::u64>(sizeof(void*)); break;
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case thing_type::Array:
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/* TODO: Return actual memory size of the array
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* By the memory size I mean the length times sizeof single element.
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*/
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size->get<thing_type::u64>() = thing->length();
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break;
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default: throw std::runtime_error("unreachable");
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}
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} break;
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case instruction_t::Lengthof: {
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auto thing = pop_thing();
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auto length = push_thing({ (struct thing_type){ thing_type::U64 }, m_context->thing_alloc() });
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length->get<thing_type::u64>() = thing->length();
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} break;
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case instruction_t::Load: {
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variable_t variable = static_cast<std::uint16_t>(frame.mod->byte(frame.position)) |
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(static_cast<std::uint16_t>(frame.mod->byte(frame.position + 1)) << 8);
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frame.position += 2;
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push_thing(load_thing(variable));
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} break;
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case instruction_t::Store: {
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variable_t variable = static_cast<std::uint16_t>(frame.mod->byte(frame.position)) |
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(static_cast<std::uint16_t>(frame.mod->byte(frame.position + 1)) << 8);
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frame.position += 2;
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store_thing(variable, std::move(pop_thing()));
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} break;
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case instruction_t::Call: {
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function_id funcId = static_cast<std::uint16_t>(frame.mod->byte(frame.position)) |
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(static_cast<std::uint16_t>(frame.mod->byte(frame.position + 1)) << 8);
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frame.position += 2;
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push_frame(frame.mod, *frame.mod->function_at(funcId));
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} break;
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case instruction_t::Jump: {
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frame.position += ((std::int8_t)frame.mod->byte(frame.position)) + 1;
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} break;
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case instruction_t::JumpNotZero: {
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byte offset = frame.mod->byte(frame.position++);
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auto cond = pop_thing();
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if (cond->integer() != 0) frame.position += (std::int8_t)offset;
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} break;
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case instruction_t::Return: {
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pop_frame();
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if (m_frames.empty()) m_flags = m_flags | executor_flags::Done;
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} break;
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case instruction_t::ReturnValue: {
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auto value = pop_thing();
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pop_frame();
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push_thing(std::move(value));
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} break;
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case instruction_t::PushConstant: throw std::runtime_error("unimplemented");
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default: throw std::runtime_error("unknown instruction");
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}
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}
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} // namespace furvm
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