From d80e0dbd20bb8597afe92f770e39d20440557d1f Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sat, 25 Jun 2022 10:16:12 -0700
Subject: Demo for a coroutine-based step evaluator.

---
 main.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
index 6b7b0f4..0240bb5 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,4 +1,6 @@
 #include <iostream>
+#include <map>
+#include <optional>
 
 #include "aisa/aisa.h"
 #include "git-tag.h"
@@ -6,6 +8,54 @@
 int main(int argc, const char *argv[])
 {
     std::cout << "Version " << GIT_TAG << "\n";
-    aisa::do_something();
+
+    aisa::Step step;
+    const_cast<std::optional<std::pair<aisa::regnum_t, aisa::regval_t>> &>(step.predicate) = std::optional(std::make_pair(123, 456));
+    const_cast<std::vector<aisa::regnum_t> &>(step.source_regs).emplace_back(12);
+    const_cast<std::vector<aisa::regnum_t> &>(step.source_regs).emplace_back(34);
+    const_cast<std::vector<aisa::regnum_t> &>(step.source_regs).emplace_back(56);
+
+    struct State : public aisa::EvalState<State> {
+        std::map<aisa::regnum_t, aisa::regval_t> regs;
+
+        std::optional<aisa::regval_t> load_reg(aisa::regnum_t rn)
+        {
+            std::cout << "state.load_reg(" << rn << ") = ";
+            if (auto x = regs.find(rn); x != regs.end()) {
+                std::cout << x->second << "\n";
+                return x->second;
+            }
+            std::cout << "(not available)\n";
+            return {};
+        }
+    } state;
+
+    auto t = state.async_load_reg(999);
+    t();
+    t();
+    t();
+    std::cout << "set regs[999] = 54321\n"; state.regs[999] = 54321;
+    std::optional<aisa::regval_t> result;
+    while (!result.has_value())
+        result = t();
+    std::cout << "result = " << *result << "\n";
+
+    std::cout << "\n\n\n";
+
+    auto w = step.evaluate(state);
+    w();
+    w();
+    w();
+    std::cout << "set predicate (valid)\n"; state.regs[step.predicate->first] = step.predicate->second;
+    w();
+    w();
+    w();
+    std::cout << "set regs (all)\n";
+    for (int i = 10; i < 100; ++i)
+        state.regs[i] = 1000 + i;
+    for (bool done = false; !done; done = w())
+        ;
+    std::cout << "huzzah!\n";
+
     return 0;
 }
-- 
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