[feat] add arg to delete if invalid

src/args.rs

@@ -7,6 +7,18 @@ pub struct Porcel8ProgramArgs {
     pub filename: Option<String>,
     #[arg(short, long, help = "Draw scale of window", default_value_t = 8f32)]
     pub draw_scale: f32,
-    #[arg(short,long,help = "Emulate new behaviour of instructions (As seen in Chip-48 and SuperChip8)",default_value_t=true)]
+    #[arg(
-    pub new_chip8_behaviour: bool
+        short,
+        long,
+        help = "Emulate new behaviour of instructions (As seen in Chip-48 and SuperChip8)",
+        default_value_t = true
+    )]
+    pub new_chip8_behaviour: bool,
+    #[arg(
+        short='i',
+        long,
+        help = "Halt on invalid instruction",
+        default_value_t = false
+    )]
+    pub halt_on_invalid: bool,
 }

src/device/device.rs

@@ -1,10 +1,9 @@
-use std::sync::{Arc, Mutex};
+use crate::{device::instruction::Instruction, util::EmulatorError};
-use rand::random;
-use crate::device::instruction::Instruction;
 use crate::device::keyboard::Keyboard;
 use crate::device::timer::DeviceTimerManager;
 use crate::util::EmulatorResult;
-
+use rand::random;
+use std::sync::{Arc, Mutex};
 
 pub struct Device {
     pub registers: RegisterFile,
@@ -13,6 +12,7 @@ pub struct Device {
     pub stack: Vec<u16>,
     pub frame_buffer: Arc<Mutex<Box<[bool; 64 * 32]>>>,
     pub new_chip8_mode: bool,
+    pub halt_on_invalid: bool,
     pub device_keyboard: Keyboard,
 }
 
@@ -21,14 +21,24 @@ impl Device {
     pub const FRAME_BUFFER_WIDTH: usize = 64;
     pub const FRAME_BUFFER_HEIGHT: usize = 32;
     pub const FRAME_BUFFER_SIZE: usize = Self::FRAME_BUFFER_WIDTH * Self::FRAME_BUFFER_HEIGHT;
-    pub fn new(timer: DeviceTimerManager, fb: Arc<Mutex<Box<[bool; Device::FRAME_BUFFER_SIZE]>>>, device_keyboard: Keyboard, new_chip8_mode: bool) -> Device {
+    pub fn new(
-        let memory = vec![0u8; Self::DEVICE_MEMORY_SIZE].into_boxed_slice().try_into().unwrap();
+        timer: DeviceTimerManager,
+        fb: Arc<Mutex<Box<[bool; Device::FRAME_BUFFER_SIZE]>>>,
+        device_keyboard: Keyboard,
+        new_chip8_mode: bool,
+        halt_on_invalid: bool
+    ) -> Device {
+        let memory = vec![0u8; Self::DEVICE_MEMORY_SIZE]
+            .into_boxed_slice()
+            .try_into()
+            .unwrap();
         log::trace!("Successfully initiated device memory");
         Device {
             registers: RegisterFile::new(),
             memory,
             frame_buffer: fb,
             stack: Vec::with_capacity(16),
+            halt_on_invalid,
             timer,
             new_chip8_mode,
             device_keyboard,
@@ -42,8 +52,6 @@ impl Device {
     const FONT_DEFAULT_MEM_LOCATION_END: usize = 0x9F;
     const ROM_START: usize = 0x200;
 
-    
-    
     pub fn cycle(&mut self) -> EmulatorResult<()> {
         self.device_keyboard.update_keyboard()?;
 
@@ -62,11 +70,17 @@ impl Device {
         // thread::sleep(Duration::from_millis(250));
         log::trace!("Executing {:?}, {:?}", &instruction, &self.registers);
         match instruction {
-            Instruction::PassThrough => {
+            Instruction::InvalidInstruction => {
                 log::info!("Executing passthrough");
+                if self.halt_on_invalid {
+                    return Err(EmulatorError::IOError("Caught Invalid Instruction".to_string()));
                 }
+            },
             Instruction::ClearScreen => {
-                let mut frame_buffer = self.frame_buffer.lock().expect("Failed to grab framebuffer for drawing");
+                let mut frame_buffer = self
+                    .frame_buffer
+                    .lock()
+                    .expect("Failed to grab framebuffer for drawing");
                 for pixel in frame_buffer.iter_mut() {
                     *pixel = false;
                 }
@@ -154,7 +168,8 @@ impl Device {
             }
             Instruction::Add(x, y) => {
                 let left = self.registers.v[x];
-                let (wrapped_addition_result, is_overflow) = left.overflowing_add(self.registers.v[y]);
+                let (wrapped_addition_result, is_overflow) =
+                    left.overflowing_add(self.registers.v[y]);
                 self.registers.v[x] = wrapped_addition_result;
                 self.set_flag_register(is_overflow);
             }
@@ -167,7 +182,8 @@ impl Device {
             }
             Instruction::RSub(x, y) => {
                 let left = self.registers.v[y];
-                let (wrapped_subtraction_result, is_overflow) = left.overflowing_sub(self.registers.v[x]);
+                let (wrapped_subtraction_result, is_overflow) =
+                    left.overflowing_sub(self.registers.v[x]);
                 self.registers.v[x] = wrapped_subtraction_result;
                 self.set_flag_register(!is_overflow);
             }
@@ -223,7 +239,8 @@ impl Device {
             }
             Instruction::SetIndexToFontCharacter(x) => {
                 let requested_char = self.registers.v[x];
-                let font_address = Self::FONT_DEFAULT_MEM_LOCATION_START as u16 + Self::FONT_HEIGHT * requested_char as u16;
+                let font_address = Self::FONT_DEFAULT_MEM_LOCATION_START as u16
+                    + Self::FONT_HEIGHT * requested_char as u16;
                 self.registers.i = font_address;
             }
             Instruction::DoBCDConversion(x) => {
@@ -267,7 +284,10 @@ impl Device {
     /// Draw a sprite at location at (x,y) for n pixels long and 8 pixels wide.
     /// Returns whether any pixel was toggled
     fn draw_sprite_at_location(&mut self, x: usize, y: usize, n: u8) -> bool {
-        let mut frame_buffer = self.frame_buffer.lock().expect("Failed to grab framebuffer for drawing");
+        let mut frame_buffer = self
+            .frame_buffer
+            .lock()
+            .expect("Failed to grab framebuffer for drawing");
 
         let mut is_pixel_toggled_off = false;
         for i in 0..n as usize {
@@ -286,8 +306,11 @@ impl Device {
                 let bit_is_true = (slice_from_memory & (1 << bit_index)) == (1 << bit_index);
 
                 // if the pixel is going to be toggled false, set this flag bit to true
-                if frame_buffer[index + (7 - bit_index)] && (bit_is_true) { is_pixel_toggled_off = true; }
+                if frame_buffer[index + (7 - bit_index)] && (bit_is_true) {
-                frame_buffer[index + (7 - bit_index)] = frame_buffer[index + (7 - bit_index)] ^ (bit_is_true);
+                    is_pixel_toggled_off = true;
+                }
+                frame_buffer[index + (7 - bit_index)] =
+                    frame_buffer[index + (7 - bit_index)] ^ (bit_is_true);
             }
         }
         is_pixel_toggled_off
@@ -313,10 +336,11 @@ impl Device {
             0xF0, 0x80, 0x80, 0x80, 0xF0, // C
             0xE0, 0x90, 0x90, 0x90, 0xE0, // D
             0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
-            0xF0, 0x80, 0xF0, 0x80, 0x80  // F
+            0xF0, 0x80, 0xF0, 0x80, 0x80, // F
         ];
         log::info!("Loaded default font from memory");
-        self.memory[Self::FONT_DEFAULT_MEM_LOCATION_START..=Self::FONT_DEFAULT_MEM_LOCATION_END].copy_from_slice(&DEFAULT_FONT);
+        self.memory[Self::FONT_DEFAULT_MEM_LOCATION_START..=Self::FONT_DEFAULT_MEM_LOCATION_END]
+            .copy_from_slice(&DEFAULT_FONT);
     }
     /// load a rom from bytes
     pub fn load_rom(&mut self, rom: &[u8]) {

src/device/instruction.rs

@@ -2,8 +2,8 @@ use byteorder::{BigEndian, ByteOrder};
 
 #[derive(Eq, PartialEq, Debug)]
 pub enum Instruction {
-    /// Blanket instruction that does nothing
+    /// Invalid instruction that may be skipped or raise error
-    PassThrough,
+    InvalidInstruction,
     /// 00E0 - Clear the screen
     ClearScreen,
     /// 00EE - Return from procedure
@@ -83,22 +83,14 @@ impl Instruction {
         let instruction = BigEndian::read_u16(location);
         let outer_instruction_nibble = (instruction & 0xF000) >> 12;
         match outer_instruction_nibble {
-            0x0 if instruction == 0xe0 => {
+            0x0 if instruction == 0xe0 => Instruction::ClearScreen,
-                Instruction::ClearScreen
+            0x0 if instruction == 0xee => Instruction::ReturnFromProcedure,
-            }
-            0x0 if instruction == 0xee => {
-                Instruction::ReturnFromProcedure
-            }
             0x0 => {
                 log::warn!("Ignoring unsupported instruction {}", instruction);
-                Instruction::PassThrough
+                Instruction::InvalidInstruction
-            }
-            0x1 => {
-                Instruction::JumpTo(instruction & 0xfff)
-            }
-            0x2 => {
-                Instruction::JumpAndLink(instruction & 0xfff)
             }
+            0x1 => Instruction::JumpTo(instruction & 0xfff),
+            0x2 => Instruction::JumpAndLink(instruction & 0xfff),
             0x3 => {
                 let register = (instruction & 0xf00) >> 8;
                 let val = instruction & 0xff;
@@ -115,24 +107,25 @@ impl Instruction {
 
                 Instruction::ConditionalEqRegisterSkipNext(register_x as usize, register_y as usize)
             }
-            0x6 => {
+            0x6 => Instruction::SetRegister(
-                Instruction::SetRegister(((instruction & 0x0f00) >> 8) as usize, (instruction & 0xff) as u8)
+                ((instruction & 0x0f00) >> 8) as usize,
-            }
+                (instruction & 0xff) as u8,
-            0x7 => {
+            ),
-                Instruction::AddValueToRegister(((instruction & 0x0f00) >> 8) as usize, (instruction & 0xff) as u8)
+            0x7 => Instruction::AddValueToRegister(
-            }
+                ((instruction & 0x0f00) >> 8) as usize,
-            0x8 => {
+                (instruction & 0xff) as u8,
-                Self::decode_arithmetic_instruction(instruction)
+            ),
-            }
+            0x8 => Self::decode_arithmetic_instruction(instruction),
             0x9 => {
                 let register_x = (instruction & 0xf00) >> 8;
                 let register_y = (instruction & 0xf0) >> 4;
 
-                Instruction::ConditionalInEqRegisterSkipNext(register_x as usize, register_y as usize)
+                Instruction::ConditionalInEqRegisterSkipNext(
-            }
+                    register_x as usize,
-            0xA => {
+                    register_y as usize,
-                Instruction::SetIndex(instruction & 0xfff)
+                )
             }
+            0xA => Instruction::SetIndex(instruction & 0xfff),
             0xB => {
                 let register_x = (instruction & 0xf00) >> 8;
                 let jump_address_base = instruction & 0xfff;
@@ -152,7 +145,7 @@ impl Instruction {
             0xE if (instruction & 0xff) == 0x9e => {
                 let x = (instruction & 0xf00) >> 8;
                 Instruction::SkipIfKeyPressed(x as usize)
-            },
+            }
             0xE if (instruction & 0xff) == 0xa1 => {
                 let x = (instruction & 0xf00) >> 8;
                 Instruction::SkipIfKeyNotPressed(x as usize)
@@ -206,36 +199,18 @@ impl Instruction {
         let reg_y = ((instruction & 0xf0) >> 4) as usize;
         let operation = instruction & 0xf;
         match operation {
-            0 => {
+            0 => Instruction::Set(reg_x, reg_y),
-                Instruction::Set(reg_x, reg_y)
+            1 => Instruction::Or(reg_x, reg_y),
-            }
+            2 => Instruction::And(reg_x, reg_y),
-            1 => {
+            3 => Instruction::Xor(reg_x, reg_y),
-                Instruction::Or(reg_x, reg_y)
+            4 => Instruction::Add(reg_x, reg_y),
-            }
+            5 => Instruction::Sub(reg_x, reg_y),
-            2 => {
+            6 => Instruction::RShift(reg_x, reg_y),
-                Instruction::And(reg_x, reg_y)
+            7 => Instruction::RSub(reg_x, reg_y),
-            }
+            0xe => Instruction::LShift(reg_x, reg_y),
-            3 => {
-                Instruction::Xor(reg_x, reg_y)
-            }
-            4 => {
-                Instruction::Add(reg_x, reg_y)
-            }
-            5 => {
-                Instruction::Sub(reg_x, reg_y)
-            }
-            6 => {
-                Instruction::RShift(reg_x, reg_y)
-            }
-            7 => {
-                Instruction::RSub(reg_x, reg_y)
-            }
-            0xe => {
-                Instruction::LShift(reg_x, reg_y)
-            }
             _ => {
                 log::error!("Encountered unexpected alu instruction {}", instruction);
-                Instruction::PassThrough
+                Instruction::InvalidInstruction
             }
         }
     }
@@ -265,11 +240,10 @@ mod tests {
         for instruction_hex in [0xf0u16, 0x0, 0x1, 0x10] {
             let instruction_bytes = instruction_hex.to_be_bytes();
             let instruction = Instruction::decode_instruction(&instruction_bytes);
-            assert_eq!(instruction, PassThrough)
+            assert_eq!(instruction, InvalidInstruction)
         }
     }
 
-
     #[test]
     fn test_jump_to_instruction_1() {
         let instruction_bytes = 0x1123_u16.to_be_bytes();
@@ -361,7 +335,6 @@ mod tests {
         assert_eq!(ins, RandomAnd(0xa, 0xbd));
     }
 
-
     #[test]
     fn test_draw() {
         let instruction_bytes = 0xdfab_u16.to_be_bytes();
@@ -498,5 +471,4 @@ mod tests {
         let ins = Instruction::decode_instruction(&instruction_bytes);
         assert_eq!(ins, LoadRegistersFromMemory(0b1001))
     }
-    
 }

src/main.rs

@@ -33,7 +33,7 @@ mod rom;
 
 fn main() -> EmulatorResult<()> {
     SimpleLogger::new().with_level(LevelFilter::Info).env().init().unwrap();
-    let Porcel8ProgramArgs { filename, new_chip8_behaviour, draw_scale } = Porcel8ProgramArgs::parse();
+    let Porcel8ProgramArgs { filename, new_chip8_behaviour, draw_scale, halt_on_invalid } = Porcel8ProgramArgs::parse();
 
     log::info!("Started emulator");
 
@@ -46,7 +46,7 @@ fn main() -> EmulatorResult<()> {
 
     timer.start();
 
-    let device = Device::new(timer, frame_buffer_for_device, device_keyboard, new_chip8_behaviour);
+    let device = Device::new(timer, frame_buffer_for_device, device_keyboard, new_chip8_behaviour, halt_on_invalid);
 
     let (device_termination_signal_sender, compute_handle) = start_compute_thread(filename, device)?;
 
@@ -163,6 +163,3 @@ fn try_initiate_sdl(draw_scale: f32) -> EmulatorResult<(WindowCanvas, EventPump,
     let event_pump = sdl_context.event_pump()?;
     Ok((canvas, event_pump, audio_queue))
 }
-
-
-