From c73688fbb03085eec48f0e47fae75debf76fe6b8 Mon Sep 17 00:00:00 2001
From: Cassie Jones <code@witchoflight.com>
Date: Fri, 10 Jan 2020 22:25:15 -0500
Subject: [PATCH] Start adding framework for encoding and decoding

---
 toolchain/src/cpu.rs         | 3 +++
 toolchain/src/inst.rs        | 3 +++
 toolchain/src/inst/decode.rs | 6 ++++++
 toolchain/src/inst/encode.rs | 6 ++++++
 4 files changed, 18 insertions(+)
 create mode 100644 toolchain/src/inst/decode.rs
 create mode 100644 toolchain/src/inst/encode.rs

diff --git a/toolchain/src/cpu.rs b/toolchain/src/cpu.rs
index 42be7ad..bca67d6 100644
--- a/toolchain/src/cpu.rs
+++ b/toolchain/src/cpu.rs
@@ -29,6 +29,7 @@ impl IndexMut<Reg> for RegFile {
 }
 
 pub struct Cpu {
+    init: bool,
     pc: u16,
     reg: RegFile,
     memory: Vec<u8>,
@@ -37,6 +38,8 @@ pub struct Cpu {
 impl Cpu {
     pub fn new() -> Self {
         Cpu {
+            init: false,
+            pc: 0,
             reg: RegFile { values: [0; 4] },
             memory: vec![0; 1 << 16],
         }
diff --git a/toolchain/src/inst.rs b/toolchain/src/inst.rs
index 2075230..8792781 100644
--- a/toolchain/src/inst.rs
+++ b/toolchain/src/inst.rs
@@ -1,3 +1,6 @@
+mod encode;
+mod decode;
+
 pub enum Reg {
     R0,
     R1,
diff --git a/toolchain/src/inst/decode.rs b/toolchain/src/inst/decode.rs
new file mode 100644
index 0000000..f85cbba
--- /dev/null
+++ b/toolchain/src/inst/decode.rs
@@ -0,0 +1,6 @@
+use std::io::{self, Read};
+use crate::inst::Inst;
+
+pub trait Decode {
+    fn decode(code: &mut impl Read) -> io::Result<Option<Inst>>;
+}
diff --git a/toolchain/src/inst/encode.rs b/toolchain/src/inst/encode.rs
new file mode 100644
index 0000000..6a50b07
--- /dev/null
+++ b/toolchain/src/inst/encode.rs
@@ -0,0 +1,6 @@
+use std::io::{self, Write};
+use crate::inst::Inst;
+
+pub trait Encode {
+    fn encode(&self, out: &mut impl Write) -> io::Result<()>;
+}
-- 
2.43.2