remove impl_opcode macro since repeation in metavariable expr is unstable

rust_issue: rust-lang/rust#83527

Author: junaadh

Cargo.lock

@@ -1,3 +1,3 @@
 [workspace]
-members = [ "asm","jnd", "vm"]
+members = [ "asm","jnd", "utils/jop", "vm"]
 resolver = "2"

Cargo.toml

@@ -0,0 +1,41 @@
+use core::fmt;
+
+use super::Erroring;
+
+#[derive(Debug)]
+pub enum AsmErr {
+    ReadFile,
+    OpenFile,
+    Parse,
+    Write,
+}
+
+impl Erroring for AsmErr {
+    fn err(&self) -> &str {
+        match self {
+            Self::ReadFile => "failed to read file to buffer",
+            Self::OpenFile => "failed to open file",
+            Self::Parse => "failed to parse token",
+            Self::Write => "failed to write binary to stdout",
+        }
+    }
+}
+
+impl fmt::Display for AsmErr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.err())
+    }
+}
+
+#[macro_export]
+macro_rules! asme {
+    ($err: expr, $kind: ident, $($args:tt)*) => {{
+        use $crate::errors::Erroring;
+        $err.vme(format!("{}: {}", $crate::errors::vme::AsmErr::$kind.err(), format_args!($($args)*)).as_str())
+    }};
+
+    ($kind:ident, $($args:tt)*) => {{
+        use $crate::errors::Erroring;
+        $crate::errors::Jerror::Vme(format!("{}: {}", $crate::errors::vme::AsmErr::$kind.err(), format_args!($($args)*)))
+    }};
+}

jnd/src/errors/asme.rs

@@ -1,6 +1,7 @@
 pub mod disassembler;
 pub mod errors;
 pub mod interrupts;
+pub mod macros;
 pub mod mem;
 pub mod op;
 pub mod reg;

jnd/src/lib.rs

@@ -0,0 +1 @@
+

jnd/src/macros.rs

@@ -2,14 +2,14 @@ use crate::{reg::Register, vme, Res};
 
 /// return-eq
 macro_rules! retq {
-    ($name: ident, $x: expr) => {
-        $x == $crate::op::Op::$name.as_u8()
-    };
+     ($name: ident, $x: expr) => {
+         $x == $crate::op::Op::$name.as_u8()
+     };
 
-    ($name:ident($($args:tt)*), $x: expr) => {
-        $x == $crate::op::Op::$name($($args)*).as_u8()
-    };
-}
+     ($name:ident($($args:tt)*), $x: expr) => {
+         $x == $crate::op::Op::$name($($args)*).as_u8()
+     };
+ }
 
 #[derive(Debug, PartialEq, PartialOrd)]
 #[repr(u8)]
@@ -66,3 +66,15 @@ impl Op {
         })
     }
 }
+
+// impl FromStr for Op {
+//     type Err = errors::Jerror;
+
+//     fn from_str(s: &str) -> Result<Self, Self::Err> {
+//         let byte = (match s.to_lowercase().as_str() {
+//             "nop" => Op::Nop,
+//             ""
+//             _ => return Err(vme!(UnknownInstruction, "instruction: {s}")),
+//         })
+//     }
+// }

jnd/src/op.rs

@@ -1,4 +1,4 @@
-use crate::{errors, vme};
+use crate::{errors, op::Op, vme};
 
 #[derive(Debug, PartialEq, PartialOrd)]
 pub enum Register {
@@ -17,14 +17,14 @@ impl TryFrom<u8> for Register {
 
     fn try_from(value: u8) -> Result<Self, Self::Error> {
         Ok(match value {
-            x if x == Register::A as u8 => Register::A,
-            x if x == Register::B as u8 => Register::B,
-            x if x == Register::C as u8 => Register::C,
-            x if x == Register::M as u8 => Register::M,
-            x if x == Register::SP as u8 => Register::SP,
-            x if x == Register::PC as u8 => Register::PC,
-            x if x == Register::BP as u8 => Register::BP,
-            x if x == Register::Flags as u8 => Register::Flags,
+            0 => Register::A,
+            1 => Register::B,
+            2 => Register::C,
+            3 => Register::M,
+            4 => Register::SP,
+            5 => Register::PC,
+            6 => Register::BP,
+            7 => Register::Flags,
             _ => return Err(vme!(InvalidRegister, "{}", value)),
         })
     }
@@ -34,6 +34,18 @@ impl TryFrom<u16> for Register {
     type Error = errors::Jerror;
 
     fn try_from(value: u16) -> Result<Self, Self::Error> {
-        (value as u8).try_into()
+        ((value & 0xff) as u8).try_into()
     }
 }
+
+#[macro_export]
+macro_rules! reg {
+    ($kind: ident) => {{
+        $crate::reg::Register::$kind as u8
+    }};
+}
+
+pub trait Parser {
+    fn encode(&self) -> u16;
+    fn decode(&self) -> Op;
+}

jnd/src/reg.rs

@@ -0,0 +1,9 @@
+[package]
+name = "jop"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]

utils/jop/Cargo.toml

@@ -0,0 +1,7 @@
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+#[proc_macro_derive(AnswerFn)]
+pub fn derive_answer_fn(_item: TokenStream) -> TokenStream {
+    "fn answer() -> u32 { 42 }".parse().unwrap()
+}