Merge pull request 'Merge compiler and emulator progress from last few months into main.' (#11) from compiler into main

Reviewed-on: #11

.cargo/config.toml

@@ -5,3 +5,7 @@ rustc-wrapper = "sccache"
 
 [future-incompat-report]
 frequency = "always"
+
+[profile.profiling]
+inherits = "release"
+debug = true

.vscode/settings.json

@@ -8,4 +8,8 @@
   "files.trimTrailingWhitespace": true,
   "gitea.owner": "LowLevelDevs",
   "gitea.repo": "damn_simple_architecture",
+  "[markdown]": {
+    "editor.formatOnSave": true,
+    "editor.formatOnPaste": true
+  }
 }

.zed/tasks.json

@@ -0,0 +1,37 @@
+[
+  {
+    "label": "Run Emulator",
+    "command": "cargo run --bin emulator",
+    "use_new_terminal": true,
+  },
+  {
+    "label": "Run Compiler",
+    "command": "cargo run --bin compiler",
+    "use_new_terminal": true,
+  },
+  {
+    "label": "Run Assembler",
+    "command": "cargo run --bin assembler",
+    "use_new_terminal": true,
+  },
+  {
+    "label": "Run Build System (dsx-build)",
+    "command": "cargo run --bin dsx-build",
+    "use_new_terminal": true,
+  },
+  {
+    "label": "Build All (Release)",
+    "command": "cargo build --release",
+    "use_new_terminal": false,
+  },
+  {
+    "label": "Run Tests",
+    "command": "cargo test",
+    "use_new_terminal": true,
+  },
+  {
+    "label": "Profile Emulator with perf",
+    "command": "cargo build --profile profiling; perf record -g -F 999 target/profiling/emulator; perf script -F +pid | save test.perf",
+    "use_new_terminal": true,
+  },
+]

Cargo.toml

@@ -15,3 +15,7 @@ panic = "abort" # Cranelift does not support stack unwinds.
 lto = false
 debug = true
 incremental = false           # sccache does not support caching incremental crates.
+
+[profile.release]
+debug = true
+lto = "fat"

assembler/src/assembler/macros.rs

@@ -4,7 +4,8 @@ use crate::assembler::model::{Node, Opcode, Symbol, Token};
 /// Parse DSA assembly code with optional formatting
 ///
 /// # Examples
-/// ```
+/// ```rs
+/// use assembler::macros::dsa;
 /// // With formatting:
 /// let nodes = dsa!(hash, "mov r1, {}", 42)?;
 ///

clippy.toml

@@ -0,0 +1 @@
+disallowed-types = ["std::collections::HashMap", "std::collections::HashSet"]

emulator/Cargo.toml

@@ -20,10 +20,11 @@ compiler = { path = "../compiler" }
 dsa_editor = { path = "../dsa_editor" }
 egui = "0.31.1"
 dirs = "6.0.0"
-discord-presence = { version = "1.6.0", optional = true }
+discord-presence = { version = "2.0.0", optional = true }
 toml = { version = "0.8.23", optional = true }
 serde = { version = "1.0.219", features = ["derive"], optional = true }
 egui_file = "0.22.1"
+rustc-hash = "2.1.1"
 
 [features]
 default = ["config"]

emulator/src/emulator/system/cache.rs

@@ -0,0 +1,53 @@
+use common::prelude::Instruction;
+use rustc_hash::FxHashMap;
+
+#[derive(Debug)]
+pub struct Cache {
+    addr: u32,
+    instruction_block: Option<[u8; 256]>,
+    instruction_lookup: FxHashMap<u32, Instruction>,
+}
+
+impl Cache {
+    #[must_use]
+    pub fn new() -> Self {
+        Self {
+            addr: 0,
+            instruction_block: None,
+            instruction_lookup: FxHashMap::default(),
+        }
+    }
+
+    pub fn lookup_value(&mut self, addr: u32) -> Option<u32> {
+        if addr < self.addr || addr >= self.addr + 256 || self.instruction_block.is_none()
+        {
+            return None;
+        }
+
+        Some(u32::from_be_bytes(
+            self.instruction_block.expect("this should not be none!")
+                [(addr - self.addr) as usize..(addr - self.addr + 4) as usize]
+                .try_into()
+                .expect("Failed to convert bytes to u32"),
+        ))
+    }
+
+    pub const fn set(&mut self, addr: u32, block: &[u8; 256]) {
+        self.addr = addr - addr % 256;
+        self.instruction_block = Some(*block);
+    }
+
+    pub fn lookup_instruction(&mut self, instruction: u32) -> Option<Instruction> {
+        self.instruction_lookup.get(&instruction).copied()
+    }
+
+    pub fn insert(&mut self, value: u32, instruction: Instruction) {
+        self.instruction_lookup.insert(value, instruction);
+    }
+}
+
+impl Default for Cache {
+    fn default() -> Self {
+        Self::new()
+    }
+}

emulator/src/emulator/system/emulator.rs

@@ -25,9 +25,11 @@ pub fn run_emulator(
     let mut running = Running::Paused;
     let mut step = 0;
     let mut addr;
-    let mut history = Vec::<(u32, Instruction)>::new();
+    let mut history = Vec::<(u32, u32)>::with_capacity(32768);
     let size = 256;
 
+    let record_history = true;
+
     state_tx
         .send(StateUpdate::Running(Running::Paused))
         .expect("Failed to send initial state!");
@@ -36,7 +38,9 @@ pub fn run_emulator(
     let mut update = false;
 
     loop {
-        let cmd = if running == Running::Running || step > 0 {
+        let cmd = if step > 0 {
+            None
+        } else if running == Running::Running && step == 0 {
             match cmd_rx.try_recv() {
                 Ok(cmd) => Some(cmd),
                 Err(mpsc::TryRecvError::Empty) => {
@@ -52,10 +56,15 @@ pub fn run_emulator(
             }
         };
 
+        if running == Running::Running && step == 0 {
+            step = 32768;
+        }
+
         if let Some(cmd) = cmd {
             match cmd {
                 Command::Start => {
                     running = Running::Running;
+                    step = 32768;
 
                     // Update RPC with current state. TODO: Make this only occur on state
                     // changes.
@@ -71,9 +80,11 @@ pub fn run_emulator(
                 }
                 Command::Stop => {
                     running = Running::Paused;
+                    step = 0;
                 }
                 Command::Reset(x) => {
                     running = Running::Paused;
+                    step = 0;
 
                     match x {
                         0 => {
@@ -95,20 +106,12 @@ pub fn run_emulator(
                 }
                 Command::Step(x) => {
                     step = x;
+                    running = Running::Paused;
                 }
                 Command::Write(offset, data) => {
                     update = true;
 
-                    processor
+                    processor.memory.write_range(offset, data);
-                        .memory
-                        .write_range(offset, data)
-                        .unwrap_or_else(|_| {
-                            report_err(
-                                state_tx,
-                                "Failed to write memory range!",
-                                &mut processor,
-                            );
-                        });
                 }
                 Command::Interrupt(_interrupt) => {
                     update = true;
@@ -118,14 +121,7 @@ pub fn run_emulator(
                 Command::MemRequest(new, size) if update => {
                     addr = new;
                     let _ = state_tx.send(StateUpdate::MemoryView(
-                        processor.memory.read_range(addr, size).unwrap_or_else(|_| {
+                        processor.memory.read_range(addr, size),
-                            report_err(
-                                state_tx,
-                                "Failed to read memory range!",
-                                &mut processor,
-                            );
-                            Vec::new()
-                        }),
                     ));
                 }
                 Command::DisplayRequest if update => {
@@ -163,51 +159,20 @@ pub fn run_emulator(
                     let _ = state_tx.send(StateUpdate::Instructions(instruction_count));
                 }
                 Command::WriteBlock(addr, block) => {
-                    processor
+                    processor.memory.write_range(addr, block.to_vec());
-                        .memory
-                        .write_range(addr, block.to_vec())
-                        .unwrap_or_else(|_| {
-                            report_err(
-                                state_tx,
-                                "Failed to write memory block!",
-                                &mut processor,
-                            );
-                        });
                 }
 
                 _ => {}
             }
         }
 
+        if running == Running::Running {
+            step += 1;
+        }
+
         if step > 0 {
             step -= 1;
             update = true;
-            running = Running::Paused;
-
-            // Execute one cycle.
-            match processor.cycle() {
-                Ok((addr, instruction)) => {
-                    history.push((addr, instruction));
-                }
-                Err(why) => {
-                    let pcx = processor
-                        .get(Register::Pcx)
-                        .expect("SPR should never be invalid");
-                    report_err(
-                        state_tx,
-                        &format!(
-                            "Could not decode instruction at {pcx:x}. Reason: {why}"
-                        ),
-                        &mut processor,
-                    );
-                }
-            }
-            instruction_count += 1;
-            continue;
-        }
-
-        if running == Running::Running {
-            update = true;
 
             // Execute one cycle.
             let instruction = match processor.cycle() {
@@ -227,9 +192,18 @@ pub fn run_emulator(
                 }
             };
 
-            history.push(instruction);
+            if record_history {
-            if matches!(instruction.1, Instruction::Halt) {
+                history.push((
+                    instruction.0,
+                    processor
+                        .get(Register::Cir)
+                        .expect("CIR should never be invalid"),
+                ));
+            }
+
+            if matches!(instruction, (_, Instruction::Halt)) {
                 running = Running::Halted;
+                step = 0;
             }
 
             instruction_count += 1;

emulator/src/emulator/system/memory.rs

@@ -1,52 +1,42 @@
-use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 
 use crate::emulator::system::model::ProcessorError;
 
 pub trait MemoryUnit: Send + Sync {
     fn reset(&mut self);
-    fn read_byte(&mut self, addr: u32) -> Result<u8, ProcessorError>;
+    fn read_byte(&mut self, addr: u32) -> u8;
-    fn write_byte(&mut self, addr: u32, value: u8) -> Result<(), ProcessorError>;
+    fn write_byte(&mut self, addr: u32, value: u8);
     fn read_word(&mut self, addr: u32) -> Result<u32, ProcessorError>;
     fn write_word(&mut self, addr: u32, value: u32) -> Result<(), ProcessorError>;
 
-    fn read_range(&mut self, addr: u32, size: u32) -> Result<Vec<u8>, ProcessorError> {
+    fn read_range(&mut self, addr: u32, size: u32) -> Vec<u8> {
         let mut data = Vec::with_capacity(size as usize);
         for i in 0..size {
-            data.push(self.read_byte(addr + i)?);
+            data.push(self.read_byte(addr + i));
         }
-        Ok(data)
+        data
     }
 
-    fn write_range(&mut self, addr: u32, value: Vec<u8>) -> Result<(), ProcessorError> {
+    fn write_range(&mut self, addr: u32, value: Vec<u8>) {
         for (i, byte) in value.into_iter().enumerate() {
-            self.write_byte(addr + i as u32, byte)?;
+            self.write_byte(addr + i as u32, byte);
         }
-        Ok(())
     }
 
-    fn read_block(&mut self, addr: u32) -> Result<[u8; 256], ProcessorError> {
+    fn read_block(&mut self, addr: u32) -> &[u8; 256];
-        let mut data = [0; 256];
-        for (i, byte) in data.iter_mut().enumerate() {
-            *byte = self.read_byte(addr + i as u32)?;
-        }
-        Ok(data)
-    }
 
-    fn write_block(&mut self, addr: u32, data: [u8; 256]) -> Result<(), ProcessorError> {
+    fn write_block(&mut self, addr: u32, data: &[u8; 256]) {
         for (i, byte) in data.iter().enumerate() {
-            self.write_byte(addr + i as u32, *byte)?;
+            self.write_byte(addr + i as u32, *byte);
         }
-        Ok(())
     }
 }
 
 pub struct MainStore {
-    pub data: HashMap<u32, Block>,
+    pub data: FxHashMap<u32, Block>,
 }
 
-pub struct Block {
+pub type Block = [u8; 256];
-    data: [u8; 256],
-}
 
 impl Default for MainStore {
     fn default() -> Self {
@@ -58,113 +48,110 @@ impl MainStore {
     #[must_use]
     pub fn new() -> Self {
         Self {
-            data: HashMap::new(),
+            data: FxHashMap::default(),
         }
     }
 
+    #[inline]
     const fn segment_addr(addr: u32) -> (u32, u8) {
         (addr / 256, (addr % 256) as u8)
     }
 
+    #[inline]
     fn mut_block(&mut self, addr: u32) -> &mut Block {
-        self.data
+        self.data.entry(addr).or_insert([0; 256])
-            .entry(addr)
-            .or_insert_with(|| Block { data: [0; 256] });
-
-        self.data.get_mut(&addr).map_or_else(
-            || panic!("Could not fetch block with address {addr:x?}"),
-            |block| block,
-        )
     }
 
+    #[inline]
     fn block(&mut self, addr: u32) -> &Block {
-        self.data
+        self.data.entry(addr).or_insert([0; 256])
-            .entry(addr)
-            .or_insert_with(|| Block { data: [0; 256] });
-
-        self.data.get(&addr).map_or_else(
-            || panic!("Could not fetch block with address {addr:x?}"),
-            |block| block,
-        )
     }
 }
 
 impl MemoryUnit for MainStore {
+    #[inline]
     fn reset(&mut self) {
         self.data.clear();
     }
 
-    fn read_byte(&mut self, addr: u32) -> Result<u8, ProcessorError> {
+    #[inline]
+    fn read_byte(&mut self, addr: u32) -> u8 {
         let (block_addr, offset) = Self::segment_addr(addr);
         let block = self.block(block_addr);
-        Ok(block.data[offset as usize])
+        block[offset as usize]
     }
 
+    #[inline]
     fn read_word(&mut self, addr: u32) -> Result<u32, ProcessorError> {
-        if addr % 4 != 0 {
+        if !addr.is_multiple_of(4) {
             return Err(ProcessorError::BadMemoryAccess(addr));
         }
 
         let (block_addr, offset) = Self::segment_addr(addr);
-        let block = self.mut_block(block_addr);
+        let offset = offset as usize;
-        let mut bytes = [0; 4];
+        let block = self.block(block_addr);
-        bytes[0] = block.data[offset as usize];
+        Ok(u32::from_be_bytes(
-        bytes[1] = block.data[(offset + 1) as usize];
+            block[offset..=offset + 3]
-        bytes[2] = block.data[(offset + 2) as usize];
+                .try_into()
-        bytes[3] = block.data[(offset + 3) as usize];
+                .expect("Failed to read word!"),
-        Ok(u32::from_be_bytes(bytes))
+        ))
     }
 
-    fn read_range(&mut self, addr: u32, size: u32) -> Result<Vec<u8>, ProcessorError> {
+    #[inline]
+    fn read_range(&mut self, addr: u32, size: u32) -> Vec<u8> {
         let mut data = Vec::with_capacity(size as usize);
         for i in 0..size {
-            data.push(self.read_byte(addr + i)?);
+            data.push(self.read_byte(addr + i));
         }
 
-        Ok(data)
+        data
     }
 
-    fn write_byte(&mut self, addr: u32, value: u8) -> Result<(), ProcessorError> {
+    #[inline]
+    fn write_byte(&mut self, addr: u32, value: u8) {
         let (block_addr, offset) = Self::segment_addr(addr);
         let block = self.mut_block(block_addr);
-        block.data[offset as usize] = value;
+        block[offset as usize] = value;
-        Ok(())
     }
 
+    #[inline]
     fn write_word(&mut self, addr: u32, value: u32) -> Result<(), ProcessorError> {
-        if addr % 4 != 0 {
+        if !addr.is_multiple_of(4) {
             return Err(ProcessorError::BadMemoryAccess(addr));
         }
 
         let (block_addr, offset) = Self::segment_addr(addr);
         let block = self.mut_block(block_addr);
-        block.data[offset as usize] = (value >> 24) as u8;
+        block[offset as usize..=(offset + 3) as usize]
-        block.data[(offset + 1) as usize] = (value >> 16) as u8;
+            .copy_from_slice(&value.to_be_bytes());
-        block.data[(offset + 2) as usize] = (value >> 8) as u8;
-        block.data[(offset + 3) as usize] = value as u8;
         Ok(())
     }
 
-    fn write_range(&mut self, addr: u32, value: Vec<u8>) -> Result<(), ProcessorError> {
+    #[inline]
-        for (i, byte) in value.into_iter().enumerate() {
+    fn write_range(&mut self, addr: u32, value: Vec<u8>) {
-            let (block_addr, offset) = Self::segment_addr(addr + i as u32);
+        let mut current_block_addr = addr / 256;
-            let block = self.mut_block(block_addr);
+        let mut current_block = self.mut_block(current_block_addr);
-            block.data[offset as usize] = byte;
+        let mut offset = addr % 256;
+        for byte in value {
+            current_block[offset as usize] = byte;
+            offset += 1;
+            if offset >= 256 {
+                offset = 0;
+                current_block_addr += 1;
+                current_block = self.mut_block(current_block_addr);
+            }
+        }
     }
 
-        Ok(())
+    #[inline]
-    }
+    fn read_block(&mut self, addr: u32) -> &[u8; 256] {
-
-    fn read_block(&mut self, addr: u32) -> Result<[u8; 256], ProcessorError> {
         let (block_addr, _) = Self::segment_addr(addr);
-        let block = self.block(block_addr);
+        self.block(block_addr)
-        Ok(block.data)
     }
 
-    fn write_block(&mut self, addr: u32, data: [u8; 256]) -> Result<(), ProcessorError> {
+    #[inline]
+    fn write_block(&mut self, addr: u32, data: &[u8; 256]) {
         let (block_addr, _) = Self::segment_addr(addr);
-        let block = self.mut_block(block_addr);
+        let _ = self.data.insert(block_addr, *data);
-        block.data = data;
-        Ok(())
     }
 }

emulator/src/emulator/system/mod.rs

@@ -1,3 +1,4 @@
+pub mod cache;
 pub mod emulator;
 pub mod memory;
 pub mod model;

emulator/src/emulator/system/model.rs

@@ -78,7 +78,7 @@ pub struct State {
 
     pub error_log: Vec<String>,
 
-    pub instruction_history: Vec<(u32, Instruction)>,
+    pub instruction_history: Vec<(u32, u32)>,
 }
 
 impl State {
@@ -154,7 +154,7 @@ pub enum StateUpdate {
     MemoryView(Vec<u8>),
     DisplayView(Vec<u8>),
     Error(String),
-    InstructionHistory(Vec<(u32, Instruction)>),
+    InstructionHistory(Vec<(u32, u32)>),
 }
 
 #[derive(Default, Debug, Clone, Copy, PartialEq, Eq)]
@@ -290,7 +290,6 @@ impl RegFile {
         })
     }
 
-    #[must_use]
     pub const fn get(&self, reg: Register) -> Result<u32, ProcessorError> {
         Ok(match reg {
             Register::Rg0 => self.rg0,

emulator/src/emulator/system/processor/mod.rs

@@ -4,6 +4,7 @@ use std::{
 };
 
 use crate::emulator::system::{
+    cache::Cache,
     memory::MemoryUnit,
     model::{IODevice, ProcessorError, RegFile},
 };
@@ -17,10 +18,7 @@ pub struct Processor {
     pub io_devices: Vec<Arc<dyn IODevice>>,
 
     pub void: u32,
-}
+    pub cache: Cache,
-
-fn log(message: &str) {
-    println!("\x1b[32mINFO:\x1b[0m {message}");
 }
 
 impl Processor {
@@ -32,6 +30,7 @@ impl Processor {
             halted: false,
             io_devices,
             void: 0,
+            cache: Cache::new(),
         }
     }
 
@@ -51,21 +50,35 @@ impl Processor {
         // Get value from PCX.
         let addr = self.fetch()?;
         // Increment PCX.
-        self.advance();
+        self.advance()?;
 
         // Set MAR to the previous value of PCX.
         *self.reg(Register::Mar)? = addr;
-        let val = self.memory.read_word(addr)?;
+
+        let encoded = if let Some(val) = self.cache.lookup_value(addr) {
+            val
+        } else {
+            let block = self.memory.read_block(addr);
+            self.cache.set(addr, block);
+            self.cache
+                .lookup_value(addr)
+                .expect("Failed to lookup value!")
+        };
 
         // Set CIR to the value of RAM[MAR].
-        *self.reg(Register::Mar)? = val;
+        *self.reg(Register::Cir)? = encoded;
 
-        // Decode and execute the instruction.
+        let decoded = if let Some(val) = self.cache.lookup_instruction(addr) {
-        let instruction = Instruction::decode(val)
+            val
-            .map_err(|_| ProcessorError::InvalidInstruction(val))?;
+        } else {
+            let decoded = Instruction::decode(encoded)
+                .map_err(|_| ProcessorError::InvalidInstruction(encoded))?;
+            self.cache.insert(addr, decoded);
+            decoded
+        };
 
-        instruction.execute(self)?;
+        decoded.execute(self)?;
-        Ok((addr, instruction))
+        Ok((addr, decoded))
     }
 
     const fn fetch(&self) -> Result<u32, ProcessorError> {
@@ -84,7 +97,7 @@ impl Processor {
     }
 
     pub fn display(&mut self) -> Result<Vec<u8>, ProcessorError> {
-        self.memory.read_range(0x20000, 2000)
+        Ok(self.memory.read_range(0x20000, 2000))
     }
 
     pub fn cmp(&mut self, a: u32, b: u32) {
@@ -163,10 +176,10 @@ impl Processor {
         let addr = self.get(Register::Spr)?;
         let size = n * 4;
         // returns the stack
-        self.memory.read_range(
+        Ok(self.memory.read_range(
             max(addr, 0),    // ensures that we cannot read from a negative address
             min(size, addr), // ensures we don't read above the top of the stack
-        )
+        ))
     }
 }
 
@@ -209,7 +222,7 @@ impl Executable for Instruction {
             Self::LoadByte(a) => {
                 *cpu.reg(a.r2)? = u32::from(
                     cpu.memory
-                        .read_byte(cpu.get(a.r1)? + u32::from(a.immediate))?,
+                        .read_byte(cpu.get(a.r1)? + u32::from(a.immediate)),
                 );
             }
 
@@ -218,7 +231,7 @@ impl Executable for Instruction {
             Self::LoadByteSigned(a) => {
                 *cpu.reg(a.r2)? = sign_extend(u32::from(
                     cpu.memory
-                        .read_byte(cpu.get(a.r1)? + u32::from(a.immediate))?,
+                        .read_byte(cpu.get(a.r1)? + u32::from(a.immediate)),
                 ));
             }
 
@@ -257,7 +270,7 @@ impl Executable for Instruction {
                 cpu.memory.write_byte(
                     cpu.get(a.r2)? + u32::from(a.immediate),
                     cpu.get(a.r1)? as u8,
-                )?;
+                );
             }
 
             // Stores a half-word from SrcReg in memory address (base + offset) The
@@ -266,9 +279,9 @@ impl Executable for Instruction {
                 // split the value into bytes and then write two bytes
                 let bytes = (cpu.get(a.r1)? as u16).to_le_bytes();
                 cpu.memory
-                    .write_byte(cpu.get(a.r2)? + u32::from(a.immediate), bytes[0])?;
+                    .write_byte(cpu.get(a.r2)? + u32::from(a.immediate), bytes[0]);
                 cpu.memory
-                    .write_byte(cpu.get(a.r2)? + u32::from(a.immediate) + 1, bytes[1])?;
+                    .write_byte(cpu.get(a.r2)? + u32::from(a.immediate) + 1, bytes[1]);
             }
 
             // Stores a word from SrcReg in memory address (base + offset) The effective

emulator/src/emulator/system/processor/tests.rs

@@ -81,9 +81,7 @@ fn test_mov_signed_instruction() {
 fn test_load_byte_instruction() {
     let mut cpu = create_test_processor();
     let addr = 0x100;
-    cpu.memory
+    cpu.memory.write_byte(addr, 0xAB);
-        .write_byte(addr, 0xAB)
-        .expect("Failed to write byte to memory");
     *cpu.reg(Register::Rg1).expect("Failed to get register Rg1") = addr - 4;
 
     let load_byte_instr = Instruction::LoadByte(ITypeArgs::new(
@@ -105,9 +103,7 @@ fn test_load_byte_instruction() {
 fn test_load_byte_signed_instruction() {
     let mut cpu = create_test_processor();
     let addr = 0x100;
-    cpu.memory
+    cpu.memory.write_byte(addr, 0xFF);
-        .write_byte(addr, 0xFF)
-        .expect("Failed to write byte to memory");
     *cpu.reg(Register::Rg1).expect("Failed to get register Rg1") = addr;
 
     let load_byte_signed_instr = Instruction::LoadByteSigned(ITypeArgs::new(
@@ -189,7 +185,7 @@ fn test_store_byte_instruction() {
     store_byte_instr.execute(&mut cpu).expect(
         "Emulator was slain by losing the game while attempting to execute instruction",
     );
-    assert_eq!(cpu.memory.read_byte(addr).expect("Emulator was slain by losing the game while attempting to execute instruction"), 0xAB);
+    assert_eq!(cpu.memory.read_byte(addr), 0xAB);
 }
 
 #[test]
@@ -468,7 +464,7 @@ fn test_shift_left_with_shamt() {
     let shl_instr = Instruction::ShiftLeft(RTypeArgs::new(
         Some(Register::Rg1),
         Some(Register::Zero),
-        None,
+        Some(Register::Rg1),
         Some(2),
     ));
 
@@ -489,7 +485,7 @@ fn test_shift_right_with_shamt() {
     let shr_instr = Instruction::ShiftRight(RTypeArgs::new(
         Some(Register::Rg1),
         Some(Register::Zero),
-        None,
+        Some(Register::Rg1),
         Some(2),
     ));
 

emulator/src/emulator/ui/editor.rs

@@ -117,10 +117,7 @@ impl Editor {
                 .file_name()
                 .unwrap_or_else(|| OsStr::new("Unnamed!"))
                 .to_str()
-                .map_or_else(
+                .unwrap_or_else(|| unreachable!("File name should be valid UTF-8."));
-                    || unreachable!("File name should be valid UTF-8."),
-                    |ext| ext,
-                );
         }
         "Unnamed!"
     }
@@ -129,12 +126,9 @@ impl Editor {
         if let Some(path) = &self.path {
             return path
                 .extension()
-                .map_or_else(|| OsStr::new("Unknown!"), |ext| ext)
+                .unwrap_or_else(|| OsStr::new("Unknown!"))
                 .to_str()
-                .map_or_else(
+                .unwrap_or_else(|| unreachable!("File name should be valid UTF-8."));
-                    || unreachable!("File name should be valid UTF-8."),
-                    |ext| ext,
-                );
         }
         "Unknown!"
     }
@@ -398,7 +392,7 @@ impl Editor {
             _ => Syntax::default(),
         };
 
-        let ed = CodeEditor::default()
+        let mut editor = CodeEditor::default()
             .id_source("editor")
             .with_fontsize(12.0)
             .with_rows(0)
@@ -407,8 +401,6 @@ impl Editor {
             .with_numlines(true)
             .desired_width(available_width - 500.0);
 
-        let mut editor = ed.clone();
-
         editor.show(ui, &mut self.text);
     }
 
@@ -451,7 +443,7 @@ impl Editor {
                 Some("dsc") => {
                     let output_path = Path::new(path).with_extension("dsa");
                     if let Err(e) = compiler::compile_file(path, &output_path) {
-                        self.error = Some(format!("Compiler error: {}", e));
+                        self.error = Some(format!("Compiler error: {e}"));
                     }
 
                     let mut compiler = CompilerEngine::new();
@@ -461,7 +453,7 @@ impl Editor {
                     let instructions = match compiler.wait_for_result() {
                         Ok(instructions) => instructions,
                         Err(e) => {
-                            self.error = Some(format!("Assembler error: {}", e));
+                            self.error = Some(format!("Assembler error: {e}"));
                             return;
                         }
                     };

emulator/src/emulator/ui/history.rs

@@ -1,3 +1,4 @@
+use common::prelude::Instruction;
 use egui::{Context, Ui};
 
 use crate::emulator::{
@@ -57,8 +58,11 @@ impl Component for History {
                                     .color(egui::Color32::from_rgb(255, 200, 200)),
                             );
 
+                            let decoded = Instruction::decode(instruction.1)
+                                .unwrap_or(Instruction::Nop);
+
                             ui.label(
-                                egui::RichText::new(instruction.1.to_string())
+                                egui::RichText::new(decoded.to_string())
                                     .font(egui::FontId::monospace(12.0))
                                     .color(egui::Color32::from_rgb(200, 255, 200)),
                             );

emulator/src/emulator/ui/loader.rs

@@ -79,10 +79,7 @@ impl Loader {
                 .file_name()
                 .unwrap_or_else(|| OsStr::new("Unnamed!"))
                 .to_str()
-                .map_or_else(
+                .unwrap_or_else(|| unreachable!("File name should be valid UTF-8."));
-                    || unreachable!("File name should be valid UTF-8."),
-                    |ext| ext,
-                );
         }
         "Unnamed!"
     }

resources/dsa/main.dsa

@@ -0,0 +1,12 @@
+// program to just test compute power
+
+dw large_num: 0x333333 // 333,333 instructions
+start:
+	ldw large_num, rg0
+
+// run approx 1m instructions
+loop:
+	dec rg0
+	cmp rg0, zero
+	jgt loop
+    hlt