From 62517a8004419591dd031faebb7a9a4827bc002a Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Tue, 1 Nov 2022 10:08:59 -0700
Subject: Support writing a trace at the end of execution.

---
 io/model.cpp | 17 +++++++++++++++++
 io/model.h   |  3 +++
 main.cpp     |  3 +++
 3 files changed, 23 insertions(+)

diff --git a/io/model.cpp b/io/model.cpp
index 79bc511..81cf318 100644
--- a/io/model.cpp
+++ b/io/model.cpp
@@ -1,6 +1,7 @@
 #include <array>
 #include <cassert>
 #include <cstdint>
+#include <fmt/format.h>
 #include <iostream>
 #include <utility>
 
@@ -85,3 +86,19 @@ void iomodel::load_evt(std::istream &fh) {
         }
     }
 }
+
+std::ostream & iomodel::write_evt(std::ostream &fh) {
+    std::uint64_t time = 0;
+    for (const auto &e : log) {
+        if (e.first != time) {
+            fh << fmt::format("+{}\n", e.first - time);
+            time = e.first;
+        }
+        if (e.second.mask == ~(std::uint_fast32_t)0) {
+            fh << fmt::format("{}=0x{:x}\n", ctlreg_names[e.second.reg], e.second.value);
+        } else {
+            fh << fmt::format("{}=0x{:x}/0x{:x}\n", ctlreg_names[e.second.reg], e.second.value, e.second.mask);
+        }
+    }
+    return fh;
+}
diff --git a/io/model.h b/io/model.h
index 2826170..f8a852b 100644
--- a/io/model.h
+++ b/io/model.h
@@ -3,6 +3,7 @@
 #include <array>
 #include <cstdint>
 #include <istream>
+#include <ostream>
 
 #include "io/event.h"
 #include "isa/isa.h"
@@ -19,4 +20,6 @@ struct iomodel {
 
     std::uint64_t load_time = 0;
     void load_evt(std::istream &fh);
+
+    std::ostream & write_evt(std::ostream &fh);
 };
diff --git a/main.cpp b/main.cpp
index 62926a5..1f1b6de 100644
--- a/main.cpp
+++ b/main.cpp
@@ -76,5 +76,8 @@ int main(int argc, const char *argv[]) {
         checker.execute();
     }
 
+    std::ofstream fh("trace.evt");
+    system.write_evt(fh);
+
     return 0;
 }
-- 
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