From 968414044e87be7399f73a01b718b4894bb65e01 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sat, 25 Jun 2022 18:56:44 -0700
Subject: Move EvalState and the eval coroutines to a separate header.

---
 aisa/eval.h | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 aisa/eval.h

(limited to 'aisa/eval.h')

diff --git a/aisa/eval.h b/aisa/eval.h
new file mode 100644
index 0000000..f97740c
--- /dev/null
+++ b/aisa/eval.h
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "aisa/aisa.h"
+
+namespace aisa {
+
+    template<typename CRTP> struct EvalState {
+        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 suspend();
+            }
+        }
+
+        task<void> async_store_reg(regnum_t rn, regval_t rv)
+        {
+            while (true) {
+                if (crtp().store_reg(rn, rv))
+                    co_return;
+                co_await suspend();
+            }
+        }
+
+        task<void> eval(const Step &step)
+        {
+            if (step.predicate.has_value()) {
+                regval_t pval = co_await async_load_reg(step.predicate->first);
+                if (pval != step.predicate->second)
+                    co_return;
+            }
+            std::vector<regval_t> source_vals;
+            source_vals.reserve(step.source_regs.size());
+            for (unsigned int i = 0; i < step.source_regs.size(); ++i)
+                source_vals.emplace_back(co_await async_load_reg(step.source_regs[i]));
+            auto destination_vals = step.compute_destinations(source_vals);
+            for (unsigned int i = 0; i < step.destination_regs.size(); ++i)
+                co_await async_store_reg(step.destination_regs[i], destination_vals[i]);
+        }
+    };
+
+}
-- 
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