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#pragma once
#include <coroutine>
#include <optional>
#include <utility>
#include <memory>
#include <vector>
#include "aisa/aisa.h"
#include "aisa/coroutine.h" // IWYU pragma: export
namespace aisa {
template<typename CRTP> struct AsyncEval {
CRTP & crtp() noexcept { return static_cast<CRTP &>(*this); }
task<regval_t> async_load_reg(regnum_t rn)
{
while (true) {
if (auto rv = crtp().load_reg(rn); rv.has_value())
co_return *rv;
co_await std::suspend_always{};
}
}
task<void> async_store_reg(regnum_t rn, regval_t rv)
{
while (true) {
if (crtp().store_reg(rn, rv))
co_return;
co_await std::suspend_always{};
}
}
task<void> async_fetch_mem(byte_t *bytes, addr_t physical_addr, addr_t size)
{
while (true) {
if (crtp().fetch_mem(bytes, physical_addr, size))
co_return;
co_await std::suspend_always{};
}
}
task<void> async_store_mem(addr_t physical_addr, const byte_t *bytes, addr_t size)
{
while (true) {
if (crtp().store_mem(physical_addr, bytes, size))
co_return;
co_await std::suspend_always{};
}
}
task<bool> async_predicate(const Step &step)
{
if (step.predicate.has_value()) {
regval_t pval = co_await crtp().async_load_reg(step.predicate->first);
co_return pval == step.predicate->second;
}
co_return true;
}
task<void> async_load_source_registers(const Step &step, Wires &w)
{
w.source_vals.resize(step.source_regs.size());
for (unsigned int i = 0; i < step.source_regs.size(); ++i)
w.source_vals[i] = co_await crtp().async_load_reg(step.source_regs[i]);
}
task<void> async_load_source_memory(const Step &step, const MemInfo &mi, Wires &w)
{
w.memory_val.resize(mi.size);
co_await crtp().async_fetch_mem(w.memory_val.data(), mi.physical_addr, mi.size);
}
task<void> async_load_sources(const Step &step, Wires &w)
{
co_await crtp().async_load_source_registers(step, w);
if (step.mop == MOp::LOAD) {
auto mi = step.meminfo(w);
co_await crtp().async_load_source_memory(step, mi, w);
}
}
task<void> async_write_destination_registers(const Step &step, const Wires &w)
{
for (unsigned int i = 0; i < step.destination_regs.size(); ++i)
co_await crtp().async_store_reg(step.destination_regs[i], w.destination_vals[i]);
}
task<void> async_write_destination_memory(const Step &step, const MemInfo &mi, const Wires &w)
{
co_await crtp().async_store_mem(mi.physical_addr, w.memory_val.data(), mi.size);
}
task<void> async_write_destinations(const Step &step, const Wires &w)
{
if (w.aborted)
co_return;
co_await crtp().async_write_destination_registers(step, w);
if (step.mop == MOp::STORE) {
auto mi = step.meminfo(w);
co_await crtp().async_write_destination_memory(step, mi, w);
}
}
task<void> async_push_task(std::unique_ptr<const Task> &&task)
{
while (true) {
if (crtp().push_task(std::move(task)))
co_return;
co_await std::suspend_always{};
}
}
task<void> async_new_task(std::unique_ptr<const Task> &&task, regval_t environment_val)
{
auto rn = task->environment;
co_await crtp().async_push_task(std::move(task));
co_await crtp().async_store_reg(rn, environment_val);
}
task<Wires> async_run_step(const Step &step)
{
Wires w;
if (!co_await crtp().async_predicate(step))
co_return std::move(w);
co_await crtp().async_load_sources(step, w);
step.evaluate(w);
co_await crtp().async_write_destinations(step, w);
if (w.new_task.has_value())
co_await crtp().async_new_task(std::move(w.new_task->first), w.new_task->second);
co_return std::move(w);
}
task<const Task *> async_top_task()
{
while (true) {
if (auto rv = crtp().top_task(); rv.has_value())
co_return &**rv;
co_await std::suspend_always{};
}
}
task<void> async_pop_task()
{
while (true) {
if (crtp().pop_task())
co_return;
co_await std::suspend_always{};
}
}
task<std::optional<std::unique_ptr<const Step>>> async_fetch_step()
{
auto task = co_await crtp().async_top_task();
auto rn = task->environment;
auto rv = co_await crtp().async_load_reg(rn);
auto step = task->step(rv);
if (step.has_value()) {
co_await crtp().async_store_reg(rn, step->second);
co_return std::move(step->first);
} else {
co_await crtp().async_pop_task();
co_return {};
}
}
task<std::pair<std::unique_ptr<const Step>, Wires>> async_fetch_and_run_step()
{
while (true) {
if (auto step = co_await crtp().async_fetch_step(); step.has_value()) {
auto wires = co_await crtp().async_run_step(**step);
co_return {std::move(*step), std::move(wires)};
}
}
}
task<void> async_run_subtree()
{
while (true) {
if (auto step = co_await crtp().async_fetch_step(); step.has_value())
co_await crtp().async_run_step_and_subtree(**step);
else
break;
}
}
task<Wires> async_run_step_and_subtree(const Step &step)
{
auto w = co_await crtp().async_run_step(step);
if (w.new_task.has_value())
co_await crtp().async_run_subtree();
co_return std::move(w);
}
task<void> async_setup_initial_task(const ISA &isa)
{
auto task = isa.initial_task();
co_await crtp().async_new_task(std::move(task.first), task.second);
}
task<void> async_run(const ISA &isa)
{
co_await crtp().async_setup_initial_task(isa);
co_await crtp().async_run_subtree();
}
};
}
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