From 68d53544fd384462656e2964344a98e4dd0c506b Mon Sep 17 00:00:00 2001
From: mlokr <jdoka@crownsterling.io>
Date: Fri, 10 May 2024 21:33:42 +0200
Subject: [PATCH] compiling return stmt

---
 hblang/build.rs                               |  95 ++++
 hblang/examples/main_fn.hb                    |   4 +-
 hblang/src/codegen.rs                         | 367 ++++++++-----
 hblang/src/ident.rs                           |   0
 hblang/src/instrs.rs                          | 497 ++++++++++++++++++
 hblang/src/lexer.rs                           |   2 +-
 hblang/src/lib.rs                             |   8 +
 hblang/src/parser.rs                          |   2 +-
 .../tests/hblang::codegen::tests::example.txt |  18 +-
 ....txt => hblang::lexer::tests::example.txt} |   3 +-
 .../tests/hblang::parser::tests::example.txt  |   4 +-
 11 files changed, 854 insertions(+), 146 deletions(-)
 create mode 100644 hblang/build.rs
 create mode 100644 hblang/src/ident.rs
 create mode 100644 hblang/src/instrs.rs
 rename hblang/tests/{hblang::lexer::tests::examples.txt => hblang::lexer::tests::example.txt} (80%)

diff --git a/hblang/build.rs b/hblang/build.rs
new file mode 100644
index 00000000..9f72d180
--- /dev/null
+++ b/hblang/build.rs
@@ -0,0 +1,95 @@
+#![feature(iter_next_chunk)]
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=../hbbytecode/instructions.in");
+
+    let instructions = include_str!("../hbbytecode/instructions.in");
+
+    let mut generated = String::new();
+    use std::fmt::Write;
+
+    writeln!(&mut generated, "impl crate::codegen::Func {{")?;
+
+    for line in instructions.lines() {
+        let line = line.strip_suffix(";").unwrap();
+        let [opcode, name, ty, doc] = line.splitn(4, ',').map(str::trim).next_chunk().unwrap();
+
+        writeln!(&mut generated, "/// {}", doc.trim_matches('"'))?;
+        write!(&mut generated, "pub fn {}(&mut self", name.to_lowercase())?;
+        for (i, c) in ty.chars().enumerate() {
+            let (name, ty) = match c {
+                'N' => continue,
+                'R' => ("reg", "u8"),
+                'B' => ("imm", "u8"),
+                'H' => ("imm", "u16"),
+                'W' => ("imm", "u32"),
+                'D' => ("imm", "u64"),
+                'P' => ("offset", "u32"),
+                'O' => ("offset", "u32"),
+                'A' => ("addr", "u64"),
+                _ => panic!("unknown type: {}", c),
+            };
+            write!(&mut generated, ", {name}{i}: {ty}")?;
+        }
+        writeln!(&mut generated, ") {{")?;
+
+        let mut offset = 1;
+        for (i, c) in ty.chars().enumerate() {
+            let width = match c {
+                'N' => 0,
+                'R' => 1,
+                'B' => 1,
+                'H' => 2,
+                'W' => 4,
+                'D' => 8,
+                'A' => 8,
+                'P' => 2,
+                'O' => 4,
+                _ => panic!("unknown type: {}", c),
+            };
+
+            if matches!(c, 'P' | 'O') {
+                writeln!(
+                    &mut generated,
+                    "    self.offset(offset{i}, {offset}, {width});",
+                )?;
+            }
+
+            offset += width;
+        }
+
+        write!(
+            &mut generated,
+            "    self.extend(crate::as_bytes(&crate::Args({opcode}"
+        )?;
+        for (i, c) in ty.chars().enumerate() {
+            let name = match c {
+                'N' => continue,
+                'R' => "reg",
+                'B' | 'H' | 'W' | 'D' => "imm",
+                'P' => "0u16",
+                'O' => "0u32",
+                'A' => "addr",
+                _ => panic!("unknown type: {}", c),
+            };
+
+            if matches!(c, 'P' | 'O') {
+                write!(&mut generated, ", {name}")?;
+            } else {
+                write!(&mut generated, ", {name}{i}")?;
+            }
+        }
+        for _ in ty.len() - (ty == "N") as usize..4 {
+            write!(&mut generated, ", ()")?;
+        }
+        writeln!(&mut generated, ")));")?;
+
+        writeln!(&mut generated, "}}")?;
+    }
+
+    writeln!(&mut generated, "}}")?;
+
+    std::fs::write("src/instrs.rs", generated)?;
+
+    Ok(())
+}
diff --git a/hblang/examples/main_fn.hb b/hblang/examples/main_fn.hb
index 2a60bce3..d6d26356 100644
--- a/hblang/examples/main_fn.hb
+++ b/hblang/examples/main_fn.hb
@@ -1,3 +1,3 @@
-main := ||: void {
-	return;
+main := ||: int {
+	return 1;
 }
diff --git a/hblang/src/codegen.rs b/hblang/src/codegen.rs
index 7dd1b621..26bc312a 100644
--- a/hblang/src/codegen.rs
+++ b/hblang/src/codegen.rs
@@ -1,5 +1,9 @@
-use {crate::parser, std::fmt::Write};
+use {
+    crate::parser::{self, Expr},
+    std::rc::Rc,
+};
 
+type LabelId = u32;
 type Reg = u8;
 type MaskElem = u64;
 
@@ -8,25 +12,102 @@ const ZERO: Reg = 0;
 const RET_ADDR: Reg = 31;
 const ELEM_WIDTH: usize = std::mem::size_of::<MaskElem>() * 8;
 
+struct Frame {
+    label:       LabelId,
+    prev_relocs: usize,
+    offset:      u32,
+}
+
+struct Reloc {
+    id:     LabelId,
+    offset: u32,
+    size:   u16,
+}
+
+#[derive(Default)]
+pub struct Func {
+    code:   Vec<u8>,
+    relocs: Vec<Reloc>,
+}
+
+impl Func {
+    pub fn extend(&mut self, bytes: &[u8]) {
+        self.code.extend_from_slice(bytes);
+    }
+
+    pub fn offset(&mut self, id: LabelId, offset: u32, size: u16) {
+        self.relocs.push(Reloc {
+            id,
+            offset: self.code.len() as u32 + offset,
+            size,
+        });
+    }
+
+    fn push(&mut self, value: Reg, size: usize) {
+        self.st(value, STACK_PTR, 0, size as _);
+        self.addi64(STACK_PTR, STACK_PTR, size as _);
+    }
+
+    fn pop(&mut self, value: Reg, size: usize) {
+        self.addi64(STACK_PTR, STACK_PTR, (size as u64).wrapping_neg());
+        self.ld(value, STACK_PTR, 0, size as _);
+    }
+
+    fn call(&mut self, func: LabelId) {
+        self.jal(RET_ADDR, ZERO, func);
+    }
+
+    fn ret(&mut self) {
+        self.jala(ZERO, RET_ADDR, 0);
+    }
+
+    fn prelude(&mut self, entry: LabelId) {
+        self.call(entry);
+        self.tx();
+    }
+
+    fn relocate(&mut self, labels: &[Label], shift: i64) {
+        for reloc in self.relocs.drain(..) {
+            let label = &labels[reloc.id as usize];
+            let offset = if reloc.size == 8 {
+                reloc.offset as i64
+            } else {
+                label.offset as i64 - reloc.offset as i64
+            } + shift;
+
+            let dest = &mut self.code[reloc.offset as usize..][..reloc.size as usize];
+            match reloc.size {
+                2 => dest.copy_from_slice(&(offset as i16).to_le_bytes()),
+                4 => dest.copy_from_slice(&(offset as i32).to_le_bytes()),
+                8 => dest.copy_from_slice(&(offset as i64).to_le_bytes()),
+                _ => unreachable!(),
+            };
+        }
+    }
+}
+
 #[derive(Default)]
 pub struct RegAlloc {
     free: Vec<Reg>,
     // TODO:use 256 bit mask instead
-    used: Vec<std::cmp::Reverse<Reg>>,
+    used: Vec<Reg>,
 }
 
 impl RegAlloc {
-    fn callee_general_purpose() -> Self {
-        Self {
-            free: (32..=253).collect(),
-            used: Vec::new(),
-        }
+    fn init_caller(&mut self) {
+        self.clear();
+        self.free.extend(1..=31);
+    }
+
+    fn clear(&mut self) {
+        self.free.clear();
+        self.used.clear();
     }
 
     fn allocate(&mut self) -> Reg {
         let reg = self.free.pop().expect("TODO: we need to spill");
-        if self.used.binary_search(&std::cmp::Reverse(reg)).is_err() {
-            self.used.push(std::cmp::Reverse(reg));
+        if self.used.binary_search_by_key(&!reg, |&r| !r).is_err() {
+            self.used.push(reg);
         }
         reg
     }
@@ -36,129 +117,171 @@ impl RegAlloc {
     }
 }
 
+struct Label {
+    offset: u32,
+    // TODO: use different stile of identifier that does not allocate, eg. index + length into a
+    // file
+    name:   Rc<str>,
+}
+
 pub struct Codegen<'a> {
-    path:        &'a std::path::Path,
-    gpa:         RegAlloc,
-    code:        String,
-    data:        String,
-    prelude_buf: String,
+    path:   &'a std::path::Path,
+    ret:    Expr<'a>,
+    gpa:    RegAlloc,
+    code:   Func,
+    temp:   Func,
+    labels: Vec<Label>,
 }
 
 impl<'a> Codegen<'a> {
     pub fn new() -> Self {
         Self {
-            path:        std::path::Path::new(""),
-            gpa:         RegAlloc::callee_general_purpose(),
-            code:        String::new(),
-            data:        String::new(),
-            prelude_buf: String::new(),
+            path:   std::path::Path::new(""),
+            ret:    Expr::Return { val: None },
+            gpa:    Default::default(),
+            code:   Default::default(),
+            temp:   Default::default(),
+            labels: Default::default(),
         }
     }
 
-    pub fn file(&mut self, path: &'a std::path::Path, exprs: &[parser::Expr]) -> std::fmt::Result {
+    pub fn file(
+        &mut self,
+        path: &'a std::path::Path,
+        exprs: &'a [parser::Expr<'a>],
+    ) -> std::fmt::Result {
         self.path = path;
         for expr in exprs {
-            self.expr(expr)?;
+            self.expr(expr, None);
         }
         Ok(())
     }
 
-    fn expr(&mut self, expr: &parser::Expr) -> std::fmt::Result {
+    fn expr(&mut self, expr: &'a parser::Expr<'a>, expeted: Option<Expr<'a>>) -> Option<Value<'a>> {
         use parser::Expr as E;
         match *expr {
             E::Decl {
                 name,
-                val:
-                    E::Closure {
-                        ret: E::Ident { name: "void" },
-                        body,
-                    },
+                val: E::Closure { ret, body },
             } => {
-                writeln!(self.code, "{name}:")?;
-                let fn_start = self.code.len();
-                self.expr(body)?;
-                self.write_fn_prelude(fn_start)
+                let frame = self.add_label(name);
+                self.ret = **ret;
+                self.expr(body, None);
+                self.write_fn_prelude(frame);
+                None
+            }
+            E::Return { val } => {
+                if let Some(val) = val {
+                    let val = self.expr(val, Some(self.ret)).unwrap();
+                    if val.ty != self.ret {
+                        panic!("expected {:?}, got {:?}", self.ret, val.ty);
+                    }
+                    match val.loc {
+                        Loc::Reg(reg) => self.code.cp(1, reg),
+                        Loc::Imm(imm) => self.code.li64(1, imm),
+                    }
+                }
+                self.ret();
+                None
             }
-            E::Return { val: None } => self.ret(),
             E::Block { stmts } => {
                 for stmt in stmts {
-                    self.expr(stmt)?;
+                    self.expr(stmt, None);
                 }
-                Ok(())
+                None
             }
+            E::Number { value } => Some(Value {
+                ty:  expeted.unwrap_or(Expr::Ident { name: "int" }),
+                loc: Loc::Imm(value),
+            }),
             ast => unimplemented!("{:?}", ast),
         }
     }
 
-    fn write_fn_prelude(&mut self, fn_start: usize) -> std::fmt::Result {
-        self.prelude_buf.clear();
-        // TODO: avoid clone here
-        for reg in self.gpa.used.clone().iter() {
-            stack_push(&mut self.prelude_buf, reg.0, 8)?;
+    fn get_or_reserve_label(&mut self, name: &str) -> LabelId {
+        if let Some(label) = self.labels.iter().position(|l| l.name.as_ref() == name) {
+            label as u32
+        } else {
+            self.labels.push(Label {
+                offset: 0,
+                name:   name.into(),
+            });
+            self.labels.len() as u32 - 1
         }
-
-        self.code.insert_str(fn_start, &self.prelude_buf);
-        self.gpa = RegAlloc::callee_general_purpose();
-
-        Ok(())
     }
 
-    fn ret(&mut self) -> std::fmt::Result {
+    fn add_label(&mut self, name: &str) -> Frame {
+        let offset = self.code.code.len() as u32;
+        let label = if let Some(label) = self.labels.iter().position(|l| l.name.as_ref() == name) {
+            self.labels[label].offset = offset;
+            label as u32
+        } else {
+            self.labels.push(Label {
+                offset,
+                name: name.into(),
+            });
+            self.labels.len() as u32 - 1
+        };
+
+        Frame {
+            label,
+            prev_relocs: self.code.relocs.len(),
+            offset,
+        }
+    }
+
+    fn get_label(&self, name: &str) -> LabelId {
+        self.labels
+            .iter()
+            .position(|l| l.name.as_ref() == name)
+            .unwrap() as _
+    }
+
+    fn write_fn_prelude(&mut self, frame: Frame) {
+        for &reg in self.gpa.used.clone().iter() {
+            self.temp.push(reg, 8);
+        }
+
+        for reloc in &mut self.code.relocs[frame.prev_relocs..] {
+            reloc.offset += self.temp.code.len() as u32;
+        }
+
+        self.code.code.splice(
+            frame.offset as usize..frame.offset as usize,
+            self.temp.code.drain(..),
+        );
+    }
+
+    fn ret(&mut self) {
         for reg in self.gpa.used.clone().iter().rev() {
-            stack_pop(&mut self.code, reg.0, 8)?;
+            self.code.pop(*reg, 8);
         }
-        ret(&mut self.code)
+        self.code.ret();
     }
 
-    pub fn dump(self, mut out: impl std::fmt::Write) -> std::fmt::Result {
-        prelude(&mut out)?;
-        writeln!(out, "{}", self.code)?;
-        writeln!(out, "{}", self.data)
+    pub fn dump(mut self, out: &mut impl std::io::Write) -> std::io::Result<()> {
+        self.temp.prelude(self.get_label("main"));
+        self.temp
+            .relocate(&self.labels, self.temp.code.len() as i64);
+
+        self.code.relocate(&self.labels, 0);
+        out.write_all(&self.temp.code)?;
+        out.write_all(&self.code.code)
     }
 }
 
-fn stack_push(out: &mut impl std::fmt::Write, value: Reg, size: usize) -> std::fmt::Result {
-    writeln!(out, "    st r{value}, r{STACK_PTR}, r{ZERO}, {size}")?;
-    writeln!(
-        out,
-        "    addi{} r{STACK_PTR}, r{STACK_PTR}, {size}",
-        size * 8
-    )
+pub struct Value<'a> {
+    ty:  Expr<'a>,
+    loc: Loc,
 }
 
-fn stack_pop(out: &mut impl std::fmt::Write, value: Reg, size: usize) -> std::fmt::Result {
-    writeln!(
-        out,
-        "    subi{} r{STACK_PTR}, r{STACK_PTR}, {size}",
-        size * 8
-    )?;
-    writeln!(out, "    ld r{value}, r{STACK_PTR}, r{ZERO}, {size}")
-}
-
-fn call(out: &mut impl std::fmt::Write, func: &str) -> std::fmt::Result {
-    stack_push(out, RET_ADDR, 8)?;
-    jump_label(out, func)?;
-    stack_pop(out, RET_ADDR, 8)
-}
-
-fn ret(out: &mut impl std::fmt::Write) -> std::fmt::Result {
-    writeln!(out, "    jala r{ZERO}, r{RET_ADDR}, 0")
-}
-
-fn jump_label(out: &mut impl std::fmt::Write, label: &str) -> std::fmt::Result {
-    writeln!(out, "    jal r{RET_ADDR}, r{ZERO}, {label}")
-}
-
-fn prelude(out: &mut impl std::fmt::Write) -> std::fmt::Result {
-    writeln!(out, "start:")?;
-    writeln!(out, "    jal r{RET_ADDR}, r{ZERO}, main")?;
-    writeln!(out, "    tx")
+pub enum Loc {
+    Reg(Reg),
+    Imm(u64),
 }
 
 #[cfg(test)]
 mod tests {
-    use std::io::Write;
-
     struct TestMem;
 
     impl hbvm::mem::Memory for TestMem {
@@ -198,55 +321,37 @@ mod tests {
         let exprs = parser.file();
         let mut codegen = super::Codegen::new();
         codegen.file(path, &exprs).unwrap();
-        codegen.dump(&mut *output).unwrap();
+        let mut out = Vec::new();
+        codegen.dump(&mut out).unwrap();
 
-        let mut proc = std::process::Command::new("/usr/bin/hbas")
-            .stdin(std::process::Stdio::piped())
-            .stdout(std::process::Stdio::piped())
-            .spawn()
-            .unwrap();
-        proc.stdin
-            .as_mut()
-            .unwrap()
-            .write_all(output.as_bytes())
-            .unwrap();
-        let out = proc.wait_with_output().unwrap();
+        use std::fmt::Write;
 
-        if !out.status.success() {
-            panic!(
-                "hbas failed with status: {}\n{}",
-                out.status,
-                String::from_utf8_lossy(&out.stderr)
-            );
-        } else {
-            use std::fmt::Write;
+        let mut stack = [0_u64; 1024];
 
-            let mut stack = [0_u64; 1024];
-
-            for b in &out.stdout {
-                writeln!(output, "{:02x}", b).unwrap();
+        for (i, b) in out.iter().enumerate() {
+            write!(output, "{:02x}", b).unwrap();
+            if (i + 1) % 4 == 0 {
+                writeln!(output).unwrap();
             }
-
-            let mut vm = unsafe {
-                hbvm::Vm::<TestMem, 0>::new(
-                    TestMem,
-                    hbvm::mem::Address::new(out.stdout.as_ptr() as u64),
-                )
-            };
-
-            vm.write_reg(super::STACK_PTR, stack.as_mut_ptr() as u64);
-
-            let stat = loop {
-                match vm.run() {
-                    Ok(hbvm::VmRunOk::End) => break Ok(()),
-                    Ok(ev) => writeln!(output, "ev: {:?}", ev).unwrap(),
-                    Err(e) => break Err(e),
-                }
-            };
-
-            writeln!(output, "ret: {:?}", vm.read_reg(0)).unwrap();
-            writeln!(output, "status: {:?}", stat).unwrap();
         }
+        writeln!(output).unwrap();
+
+        let mut vm = unsafe {
+            hbvm::Vm::<TestMem, 0>::new(TestMem, hbvm::mem::Address::new(out.as_ptr() as u64))
+        };
+
+        vm.write_reg(super::STACK_PTR, stack.as_mut_ptr() as u64);
+
+        let stat = loop {
+            match vm.run() {
+                Ok(hbvm::VmRunOk::End) => break Ok(()),
+                Ok(ev) => writeln!(output, "ev: {:?}", ev).unwrap(),
+                Err(e) => break Err(e),
+            }
+        };
+
+        writeln!(output, "ret: {:?}", vm.read_reg(1)).unwrap();
+        writeln!(output, "status: {:?}", stat).unwrap();
     }
 
     crate::run_tests! { generate:
diff --git a/hblang/src/ident.rs b/hblang/src/ident.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/hblang/src/instrs.rs b/hblang/src/instrs.rs
new file mode 100644
index 00000000..f45fdf6b
--- /dev/null
+++ b/hblang/src/instrs.rs
@@ -0,0 +1,497 @@
+impl crate::codegen::Func {
+/// Cause an unreachable code trap
+pub fn un(&mut self) {
+    self.extend(crate::as_bytes(&crate::Args(0x00, (), (), (), ())));
+}
+/// Termiante execution
+pub fn tx(&mut self) {
+    self.extend(crate::as_bytes(&crate::Args(0x01, (), (), (), ())));
+}
+/// Do nothing
+pub fn nop(&mut self) {
+    self.extend(crate::as_bytes(&crate::Args(0x02, (), (), (), ())));
+}
+/// Addition (8b)
+pub fn add8(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x03, reg0, reg1, reg2, ())));
+}
+/// Addition (16b)
+pub fn add16(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x04, reg0, reg1, reg2, ())));
+}
+/// Addition (32b)
+pub fn add32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x05, reg0, reg1, reg2, ())));
+}
+/// Addition (64b)
+pub fn add64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x06, reg0, reg1, reg2, ())));
+}
+/// Subtraction (8b)
+pub fn sub8(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x07, reg0, reg1, reg2, ())));
+}
+/// Subtraction (16b)
+pub fn sub16(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x08, reg0, reg1, reg2, ())));
+}
+/// Subtraction (32b)
+pub fn sub32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x09, reg0, reg1, reg2, ())));
+}
+/// Subtraction (64b)
+pub fn sub64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x0A, reg0, reg1, reg2, ())));
+}
+/// Multiplication (8b)
+pub fn mul8(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x0B, reg0, reg1, reg2, ())));
+}
+/// Multiplication (16b)
+pub fn mul16(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x0C, reg0, reg1, reg2, ())));
+}
+/// Multiplication (32b)
+pub fn mul32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x0D, reg0, reg1, reg2, ())));
+}
+/// Multiplication (64b)
+pub fn mul64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x0E, reg0, reg1, reg2, ())));
+}
+/// Bitand
+pub fn and(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x0F, reg0, reg1, reg2, ())));
+}
+/// Bitor
+pub fn or(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x10, reg0, reg1, reg2, ())));
+}
+/// Bitxor
+pub fn xor(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x11, reg0, reg1, reg2, ())));
+}
+/// Unsigned left bitshift (8b)
+pub fn slu8(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x12, reg0, reg1, reg2, ())));
+}
+/// Unsigned left bitshift (16b)
+pub fn slu16(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x13, reg0, reg1, reg2, ())));
+}
+/// Unsigned left bitshift (32b)
+pub fn slu32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x14, reg0, reg1, reg2, ())));
+}
+/// Unsigned left bitshift (64b)
+pub fn slu64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x15, reg0, reg1, reg2, ())));
+}
+/// Unsigned right bitshift (8b)
+pub fn sru8(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x16, reg0, reg1, reg2, ())));
+}
+/// Unsigned right bitshift (16b)
+pub fn sru16(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x17, reg0, reg1, reg2, ())));
+}
+/// Unsigned right bitshift (32b)
+pub fn sru32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x18, reg0, reg1, reg2, ())));
+}
+/// Unsigned right bitshift (64b)
+pub fn sru64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x19, reg0, reg1, reg2, ())));
+}
+/// Signed right bitshift (8b)
+pub fn srs8(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x1A, reg0, reg1, reg2, ())));
+}
+/// Signed right bitshift (16b)
+pub fn srs16(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x1B, reg0, reg1, reg2, ())));
+}
+/// Signed right bitshift (32b)
+pub fn srs32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x1C, reg0, reg1, reg2, ())));
+}
+/// Signed right bitshift (64b)
+pub fn srs64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x1D, reg0, reg1, reg2, ())));
+}
+/// Unsigned comparsion
+pub fn cmpu(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x1E, reg0, reg1, reg2, ())));
+}
+/// Signed comparsion
+pub fn cmps(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x1F, reg0, reg1, reg2, ())));
+}
+/// Merged divide-remainder (unsigned 8b)
+pub fn diru8(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x20, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (unsigned 16b)
+pub fn diru16(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x21, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (unsigned 32b)
+pub fn diru32(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x22, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (unsigned 64b)
+pub fn diru64(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x23, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (signed 8b)
+pub fn dirs8(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x24, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (signed 16b)
+pub fn dirs16(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x25, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (signed 32b)
+pub fn dirs32(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x26, reg0, reg1, reg2, reg3)));
+}
+/// Merged divide-remainder (signed 64b)
+pub fn dirs64(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x27, reg0, reg1, reg2, reg3)));
+}
+/// Bit negation
+pub fn neg(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x28, reg0, reg1, (), ())));
+}
+/// Logical negation
+pub fn not(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x29, reg0, reg1, (), ())));
+}
+/// Sign extend 8b to 64b
+pub fn sxt8(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x2A, reg0, reg1, (), ())));
+}
+/// Sign extend 16b to 64b
+pub fn sxt16(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x2B, reg0, reg1, (), ())));
+}
+/// Sign extend 32b to 64b
+pub fn sxt32(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x2C, reg0, reg1, (), ())));
+}
+/// Addition with immediate (8b)
+pub fn addi8(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x2D, reg0, reg1, imm2, ())));
+}
+/// Addition with immediate (16b)
+pub fn addi16(&mut self, reg0: u8, reg1: u8, imm2: u16) {
+    self.extend(crate::as_bytes(&crate::Args(0x2E, reg0, reg1, imm2, ())));
+}
+/// Addition with immediate (32b)
+pub fn addi32(&mut self, reg0: u8, reg1: u8, imm2: u32) {
+    self.extend(crate::as_bytes(&crate::Args(0x2F, reg0, reg1, imm2, ())));
+}
+/// Addition with immediate (64b)
+pub fn addi64(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x30, reg0, reg1, imm2, ())));
+}
+/// Multiplication with immediate (8b)
+pub fn muli8(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x31, reg0, reg1, imm2, ())));
+}
+/// Multiplication with immediate (16b)
+pub fn muli16(&mut self, reg0: u8, reg1: u8, imm2: u16) {
+    self.extend(crate::as_bytes(&crate::Args(0x32, reg0, reg1, imm2, ())));
+}
+/// Multiplication with immediate (32b)
+pub fn muli32(&mut self, reg0: u8, reg1: u8, imm2: u32) {
+    self.extend(crate::as_bytes(&crate::Args(0x33, reg0, reg1, imm2, ())));
+}
+/// Multiplication with immediate (64b)
+pub fn muli64(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x34, reg0, reg1, imm2, ())));
+}
+/// Bitand with immediate
+pub fn andi(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x35, reg0, reg1, imm2, ())));
+}
+/// Bitor with immediate
+pub fn ori(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x36, reg0, reg1, imm2, ())));
+}
+/// Bitxor with immediate
+pub fn xori(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x37, reg0, reg1, imm2, ())));
+}
+/// Unsigned left bitshift with immedidate (8b)
+pub fn slui8(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x38, reg0, reg1, imm2, ())));
+}
+/// Unsigned left bitshift with immedidate (16b)
+pub fn slui16(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x39, reg0, reg1, imm2, ())));
+}
+/// Unsigned left bitshift with immedidate (32b)
+pub fn slui32(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x3A, reg0, reg1, imm2, ())));
+}
+/// Unsigned left bitshift with immedidate (64b)
+pub fn slui64(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x3B, reg0, reg1, imm2, ())));
+}
+/// Unsigned right bitshift with immediate (8b)
+pub fn srui8(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x3C, reg0, reg1, imm2, ())));
+}
+/// Unsigned right bitshift with immediate (16b)
+pub fn srui16(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x3D, reg0, reg1, imm2, ())));
+}
+/// Unsigned right bitshift with immediate (32b)
+pub fn srui32(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x3E, reg0, reg1, imm2, ())));
+}
+/// Unsigned right bitshift with immediate (64b)
+pub fn srui64(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x3F, reg0, reg1, imm2, ())));
+}
+/// Signed right bitshift with immediate
+pub fn srsi8(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x40, reg0, reg1, imm2, ())));
+}
+/// Signed right bitshift with immediate
+pub fn srsi16(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x41, reg0, reg1, imm2, ())));
+}
+/// Signed right bitshift with immediate
+pub fn srsi32(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x42, reg0, reg1, imm2, ())));
+}
+/// Signed right bitshift with immediate
+pub fn srsi64(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x43, reg0, reg1, imm2, ())));
+}
+/// Unsigned compare with immediate
+pub fn cmpui(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x44, reg0, reg1, imm2, ())));
+}
+/// Signed compare with immediate
+pub fn cmpsi(&mut self, reg0: u8, reg1: u8, imm2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x45, reg0, reg1, imm2, ())));
+}
+/// Copy register
+pub fn cp(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x46, reg0, reg1, (), ())));
+}
+/// Swap registers
+pub fn swa(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x47, reg0, reg1, (), ())));
+}
+/// Load immediate (8b)
+pub fn li8(&mut self, reg0: u8, imm1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x48, reg0, imm1, (), ())));
+}
+/// Load immediate (16b)
+pub fn li16(&mut self, reg0: u8, imm1: u16) {
+    self.extend(crate::as_bytes(&crate::Args(0x49, reg0, imm1, (), ())));
+}
+/// Load immediate (32b)
+pub fn li32(&mut self, reg0: u8, imm1: u32) {
+    self.extend(crate::as_bytes(&crate::Args(0x4A, reg0, imm1, (), ())));
+}
+/// Load immediate (64b)
+pub fn li64(&mut self, reg0: u8, imm1: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x4B, reg0, imm1, (), ())));
+}
+/// Load relative address
+pub fn lra(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 4);
+    self.extend(crate::as_bytes(&crate::Args(0x4C, reg0, reg1, 0u32, ())));
+}
+/// Load from absolute address
+pub fn ld(&mut self, reg0: u8, reg1: u8, addr2: u64, imm3: u16) {
+    self.extend(crate::as_bytes(&crate::Args(0x4D, reg0, reg1, addr2, imm3)));
+}
+/// Store to absolute address
+pub fn st(&mut self, reg0: u8, reg1: u8, addr2: u64, imm3: u16) {
+    self.extend(crate::as_bytes(&crate::Args(0x4E, reg0, reg1, addr2, imm3)));
+}
+/// Load from relative address
+pub fn ldr(&mut self, reg0: u8, reg1: u8, offset2: u32, imm3: u16) {
+    self.offset(offset2, 3, 4);
+    self.extend(crate::as_bytes(&crate::Args(0x4F, reg0, reg1, 0u32, imm3)));
+}
+/// Store to relative address
+pub fn str(&mut self, reg0: u8, reg1: u8, offset2: u32, imm3: u16) {
+    self.offset(offset2, 3, 4);
+    self.extend(crate::as_bytes(&crate::Args(0x50, reg0, reg1, 0u32, imm3)));
+}
+/// Copy block of memory
+pub fn bmc(&mut self, reg0: u8, reg1: u8, imm2: u16) {
+    self.extend(crate::as_bytes(&crate::Args(0x51, reg0, reg1, imm2, ())));
+}
+/// Copy register block
+pub fn brc(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x52, reg0, reg1, imm2, ())));
+}
+/// Relative jump
+pub fn jmp(&mut self, offset0: u32) {
+    self.offset(offset0, 1, 4);
+    self.extend(crate::as_bytes(&crate::Args(0x53, 0u32, (), (), ())));
+}
+/// Linking relative jump
+pub fn jal(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 4);
+    self.extend(crate::as_bytes(&crate::Args(0x54, reg0, reg1, 0u32, ())));
+}
+/// Linking absolute jump
+pub fn jala(&mut self, reg0: u8, reg1: u8, addr2: u64) {
+    self.extend(crate::as_bytes(&crate::Args(0x55, reg0, reg1, addr2, ())));
+}
+/// Branch on equal
+pub fn jeq(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x56, reg0, reg1, 0u16, ())));
+}
+/// Branch on nonequal
+pub fn jne(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x57, reg0, reg1, 0u16, ())));
+}
+/// Branch on lesser-than (unsigned)
+pub fn jltu(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x58, reg0, reg1, 0u16, ())));
+}
+/// Branch on greater-than (unsigned)
+pub fn jgtu(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x59, reg0, reg1, 0u16, ())));
+}
+/// Branch on lesser-than (signed)
+pub fn jlts(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x5A, reg0, reg1, 0u16, ())));
+}
+/// Branch on greater-than (signed)
+pub fn jgts(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x5B, reg0, reg1, 0u16, ())));
+}
+/// Environment call trap
+pub fn eca(&mut self) {
+    self.extend(crate::as_bytes(&crate::Args(0x5C, (), (), (), ())));
+}
+/// Environment breakpoint
+pub fn ebp(&mut self) {
+    self.extend(crate::as_bytes(&crate::Args(0x5D, (), (), (), ())));
+}
+/// Floating point addition (32b)
+pub fn fadd32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x5E, reg0, reg1, reg2, ())));
+}
+/// Floating point addition (64b)
+pub fn fadd64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x5F, reg0, reg1, reg2, ())));
+}
+/// Floating point subtraction (32b)
+pub fn fsub32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x60, reg0, reg1, reg2, ())));
+}
+/// Floating point subtraction (64b)
+pub fn fsub64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x61, reg0, reg1, reg2, ())));
+}
+/// Floating point multiply (32b)
+pub fn fmul32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x62, reg0, reg1, reg2, ())));
+}
+/// Floating point multiply (64b)
+pub fn fmul64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x63, reg0, reg1, reg2, ())));
+}
+/// Floating point division (32b)
+pub fn fdiv32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x64, reg0, reg1, reg2, ())));
+}
+/// Floating point division (64b)
+pub fn fdiv64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x65, reg0, reg1, reg2, ())));
+}
+/// Float fused multiply-add (32b)
+pub fn fma32(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x66, reg0, reg1, reg2, reg3)));
+}
+/// Float fused multiply-add (64b)
+pub fn fma64(&mut self, reg0: u8, reg1: u8, reg2: u8, reg3: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x67, reg0, reg1, reg2, reg3)));
+}
+/// Float reciprocal (32b)
+pub fn finv32(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x68, reg0, reg1, (), ())));
+}
+/// Float reciprocal (64b)
+pub fn finv64(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x69, reg0, reg1, (), ())));
+}
+/// Flaot compare less than (32b)
+pub fn fcmplt32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x6A, reg0, reg1, reg2, ())));
+}
+/// Flaot compare less than (64b)
+pub fn fcmplt64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x6B, reg0, reg1, reg2, ())));
+}
+/// Flaot compare greater than (32b)
+pub fn fcmpgt32(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x6C, reg0, reg1, reg2, ())));
+}
+/// Flaot compare greater than (64b)
+pub fn fcmpgt64(&mut self, reg0: u8, reg1: u8, reg2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x6D, reg0, reg1, reg2, ())));
+}
+/// Int to 32 bit float
+pub fn itf32(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x6E, reg0, reg1, (), ())));
+}
+/// Int to 64 bit float
+pub fn itf64(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x6F, reg0, reg1, (), ())));
+}
+/// Float 32 to int
+pub fn fti32(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x70, reg0, reg1, imm2, ())));
+}
+/// Float 64 to int
+pub fn fti64(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x71, reg0, reg1, imm2, ())));
+}
+/// Float 64 to Float 32
+pub fn fc32t64(&mut self, reg0: u8, reg1: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x72, reg0, reg1, (), ())));
+}
+/// Float 32 to Float 64
+pub fn fc64t32(&mut self, reg0: u8, reg1: u8, imm2: u8) {
+    self.extend(crate::as_bytes(&crate::Args(0x73, reg0, reg1, imm2, ())));
+}
+/// Load relative immediate (16 bit)
+pub fn lra16(&mut self, reg0: u8, reg1: u8, offset2: u32) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x74, reg0, reg1, 0u16, ())));
+}
+/// Load from relative address (16 bit)
+pub fn ldr16(&mut self, reg0: u8, reg1: u8, offset2: u32, imm3: u16) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x75, reg0, reg1, 0u16, imm3)));
+}
+/// Store to relative address (16 bit)
+pub fn str16(&mut self, reg0: u8, reg1: u8, offset2: u32, imm3: u16) {
+    self.offset(offset2, 3, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x76, reg0, reg1, 0u16, imm3)));
+}
+/// Relative jump (16 bit)
+pub fn jmp16(&mut self, offset0: u32) {
+    self.offset(offset0, 1, 2);
+    self.extend(crate::as_bytes(&crate::Args(0x77, 0u16, (), (), ())));
+}
+}
diff --git a/hblang/src/lexer.rs b/hblang/src/lexer.rs
index 1bf68dc9..54f41707 100644
--- a/hblang/src/lexer.rs
+++ b/hblang/src/lexer.rs
@@ -162,6 +162,6 @@ mod tests {
     crate::run_tests! { lex:
         empty => "";
         whitespace => " \t\n\r";
-        examples => include_str!("../examples/main_fn.hb");
+        example => include_str!("../examples/main_fn.hb");
     }
 }
diff --git a/hblang/src/lib.rs b/hblang/src/lib.rs
index cdf49574..3036a949 100644
--- a/hblang/src/lib.rs
+++ b/hblang/src/lib.rs
@@ -14,11 +14,19 @@ macro_rules! run_tests {
 }
 
 mod codegen;
+mod ident;
+mod instrs;
 mod lexer;
 mod parser;
 mod tests;
 mod typechk;
 
+#[repr(packed)]
+struct Args<A, B, C, D>(u8, A, B, C, D);
+fn as_bytes<T>(args: &T) -> &[u8] {
+    unsafe { core::slice::from_raw_parts(args as *const _ as *const u8, core::mem::size_of::<T>()) }
+}
+
 pub fn try_block<R>(f: impl FnOnce() -> R) -> R {
     f()
 }
diff --git a/hblang/src/parser.rs b/hblang/src/parser.rs
index de0b35e4..e2b2cf25 100644
--- a/hblang/src/parser.rs
+++ b/hblang/src/parser.rs
@@ -118,7 +118,7 @@ impl<'a, 'b> Parser<'a, 'b> {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Expr<'a> {
     Decl {
         name: Ptr<'a, str>,
diff --git a/hblang/tests/hblang::codegen::tests::example.txt b/hblang/tests/hblang::codegen::tests::example.txt
index def855cf..eed3d92d 100644
--- a/hblang/tests/hblang::codegen::tests::example.txt
+++ b/hblang/tests/hblang::codegen::tests::example.txt
@@ -1,8 +1,10 @@
-start:
-    addi64 r254, r254, 8
-    jal r0, r0, main
-    tx
-main:
-    jala r0, r31, 0
-
-
+541f0005
+00000001
+4b010100
+00000000
+00005500
+1f000000
+00000000
+00
+ret: 1
+status: Ok(())
diff --git a/hblang/tests/hblang::lexer::tests::examples.txt b/hblang/tests/hblang::lexer::tests::example.txt
similarity index 80%
rename from hblang/tests/hblang::lexer::tests::examples.txt
rename to hblang/tests/hblang::lexer::tests::example.txt
index d06509f9..0d80f72c 100644
--- a/hblang/tests/hblang::lexer::tests::examples.txt
+++ b/hblang/tests/hblang::lexer::tests::example.txt
@@ -2,9 +2,10 @@ Ident "main"
 Decl ":="
 Or "||"
 Colon ":"
-Ident "void"
+Ident "int"
 LBrace "{"
 Return "return"
+Number "1"
 Semi ";"
 RBrace "}"
 Eof ""
diff --git a/hblang/tests/hblang::parser::tests::example.txt b/hblang/tests/hblang::parser::tests::example.txt
index 4e57f17d..3b672315 100644
--- a/hblang/tests/hblang::parser::tests::example.txt
+++ b/hblang/tests/hblang::parser::tests::example.txt
@@ -1,3 +1,3 @@
-main := ||: void {
-    return;
+main := ||: int {
+    return 1;
 }