[dbg] Add results

src/emu/iomem.rs

@@ -1,11 +1,12 @@
-
 use crate::emu::mmu::Memory;
+use crate::misc::emulator_error::EmulatorError;
 use crate::misc::endian::MemoryOperations;
+use crate::misc::result::EmulatorResult;
 
 #[derive(Debug, Copy, Clone)]
 pub struct MemoryMappedIO {
     //FIXME use a keyboard
-    keyboard_bytes: [u8;2],
+    keyboard_bytes: [u8; 2],
     program_counter: [u8; 3],
     //FIXME use a device
     pixel_reg: u8,
@@ -16,7 +17,7 @@ pub struct MemoryMappedIO {
 impl MemoryMappedIO {
     pub fn new() -> MemoryMappedIO {
         MemoryMappedIO {
-            keyboard_bytes: [0,0],
+            keyboard_bytes: [0, 0],
             program_counter: [0, 0, 0],
             pixel_reg: 0,
             audio_sample_address_base: [0, 0],
@@ -42,31 +43,32 @@ const AUDIO_SAMPLE_BASE_LEN: u32 = 2;
 const AUDIO_SAMPLE_BASE_END: u32 = AUDIO_SAMPLE_BASE_START + AUDIO_SAMPLE_BASE_LEN - 1;
 
 impl Memory for MemoryMappedIO {
-    fn get_byte(&self, address: u32) -> u8 {
-        match address {
+    fn try_get_byte(&self, address: u32) -> EmulatorResult<u8> {
+        let byte = match address {
             KEYBOARD_BIT_START..=KEYBOARD_BIT_END => {
                 let addr_usize = address as usize;
                 let keyboard_byte = self.keyboard_bytes[addr_usize];
                 log::trace!("Fetching keyboard({}) byte segment {} -> {}",MemoryOperations::read_big_endian_u16(&self.keyboard_bytes),address,keyboard_byte);
                 keyboard_byte
-            },
+            }
             PC_START_ADDR..=PC_END_ADDR => {
                 let pc_index = (address - PC_START_ADDR) as usize;
                 let pc_byte = self.program_counter[pc_index];
                 log::trace!("Fetching PC({}) byte segment {} -> {}",MemoryOperations::read_big_endian_u24(&self.program_counter),pc_index,pc_byte);
                 pc_byte
-            },
+            }
             PIXEL_BASE => {
                 log::trace!("Fetching pixel base reg {}",self.pixel_reg);
                 self.pixel_reg
-            },
+            }
             AUDIO_SAMPLE_BASE_START => self.audio_sample_address_base[0],
             AUDIO_SAMPLE_BASE_END => self.audio_sample_address_base[1],
             _ => { panic!("Unreachable code") }
-        }
+        };
+        Ok(byte)
     }
 
-    fn set_byte(&mut self, address: u32, val: u8) {
+    fn try_set_byte(&mut self, address: u32, val: u8) -> EmulatorResult<()> {
         todo!()
     }
 }

src/emu/mem.rs

@@ -1,4 +1,8 @@
+use std::ops::Index;
 use crate::emu::mmu::Memory;
+use crate::misc::emulator_error::DeviceType::RAM;
+use crate::misc::emulator_error::EmulatorError;
+use crate::misc::result::EmulatorResult;
 
 const MEM_LENGTH: usize = 2 << 24;
 
@@ -8,21 +12,30 @@ pub struct RamMemory {
 }
 
 impl RamMemory {
-    pub fn new() -> RamMemory {
-        RamMemory {
-            data: vec![0; MEM_LENGTH].into_boxed_slice().try_into().expect("Incorrect ram allocation")
-        }
+    pub fn try_new() -> EmulatorResult<RamMemory> {
+        let alloc_result = vec![0; MEM_LENGTH].into_boxed_slice();
+        let data = alloc_result.try_into().map_err(|err|{
+            EmulatorError::AllocationError(RAM,"Allocation failed")
+        })?;
+        Ok(RamMemory {
+            data
+        })
     }
 }
 
+
 impl Memory for RamMemory {
-    fn get_byte(&self, address: u32) -> u8 {
+    fn try_get_byte(&self, address: u32) -> EmulatorResult<u8> {
         log::trace!("Fetch RAM memory at address {}",address);
-        let x = *self.data.get(address as usize).expect("Unchecked address fetch");
-        x
+        let x = *self.data.get(address as usize).ok_or(EmulatorError::UnreachableMemoryError(RAM,address))?;
+        Ok(x)
     }
 
-    fn set_byte(&mut self, address: u32, val: u8) {
-        self.data[address as usize] = val;
+    fn try_set_byte(&mut self, address: u32, value: u8) -> EmulatorResult<()> {
+        if address>= MEM_LENGTH as u32 {
+            return Err(EmulatorError::UnreachableMemoryError(RAM,address))
+        }
+        self.data[address as usize] = value;
+        Ok(())
     }
 }

src/emu/mmu.rs

@@ -1,47 +1,55 @@
 use crate::emu::iomem::MemoryMappedIO;
 use crate::emu::mem::RamMemory;
+use crate::misc::emulator_error::DeviceType::MMU;
+
+use crate::misc::emulator_error::EmulatorError::UnreachableMemoryError;
+use crate::misc::result::EmulatorResult;
 
 // 8 bytes that are memory mapped i/o
-pub const MMAPPEDIO_END: u32 = RAM_MEM_START-1;
-pub const RAM_MEM_START:u32 = 8;
+pub const MMAPPEDIO_END: u32 = RAM_MEM_START - 1;
+pub const RAM_MEM_START: u32 = 8;
 /// Last index of ram
-pub const RAM_MEM_END: u32 = 2<<24 - 1;
+pub const RAM_MEM_END: u32 = 2 << 24 - 1;
 
 ///
 /// mapped I/O + RAM.
 pub trait Memory {
     /// Get the value (24bit) at the address(24bit)
-    fn get_byte(&self, address: u32) -> u8;
+    fn try_get_byte(&self, address: u32) -> EmulatorResult<u8>;
     /// Set the value at the 24bit address
-    fn set_byte(&mut self, address: u32, value: u8);
+    fn try_set_byte(&mut self, address: u32, value: u8) -> EmulatorResult<()>;
 }
-#[derive(Debug,Clone)]
+
+#[derive(Debug, Clone)]
 pub struct MappedMemory {
     memory_mapped_io: MemoryMappedIO,
     ram_memory: RamMemory,
 }
+
 impl MappedMemory {
-    pub fn new(memory_mapped_io: MemoryMappedIO, ram_memory: RamMemory)-> MappedMemory {
+    pub fn new(memory_mapped_io: MemoryMappedIO, ram_memory: RamMemory) -> MappedMemory {
         MappedMemory {
             memory_mapped_io,
-            ram_memory
+            ram_memory,
         }
     }
 }
 
 impl Memory for MappedMemory {
-    fn get_byte(&self, address: u32) -> u8 {
-        match address {
+    fn try_get_byte(&self, address: u32) -> EmulatorResult<u8> {
+        let byte_at_addr = match address {
             0..=MMAPPEDIO_END => {
-                self.memory_mapped_io.get_byte(address)
-            },
-            RAM_MEM_START..=RAM_MEM_END =>{
-                self.ram_memory.get_byte(address)
+                self.memory_mapped_io.try_get_byte(address)
             }
-            _ => { panic!("Invalid address") }
+            RAM_MEM_START..=RAM_MEM_END => {
+                self.ram_memory.try_get_byte(address)
             }
+            _ => { Err(UnreachableMemoryError(MMU, address)) }
+        }?;
+
+        Ok(byte_at_addr)
     }
-    fn set_byte(&mut self, address: u32, value: u8) {
+    fn try_set_byte(&mut self, address: u32, value: u8) -> EmulatorResult<()> {
         todo!()
     }
 }

src/main.rs

@@ -2,19 +2,20 @@ use simple_logger::SimpleLogger;
 use crate::emu::iomem::MemoryMappedIO;
 use crate::emu::mem::RamMemory;
 use crate::emu::mmu::{Memory, MappedMemory};
+use crate::misc::emulator_error::EmulatorError;
 
 mod emu;
 mod args;
 mod misc;
 
-fn main() {
+fn main() ->Result<(),EmulatorError> {
     SimpleLogger::new().env().init().unwrap();
 
     let mmio = MemoryMappedIO::new();
-    let ram = RamMemory::new();
+    let ram = RamMemory::try_new()?;
     let mmu = MappedMemory::new(mmio, ram);
     for i in 0..10 {
-        log::info!("Memory at {} is {}",i,mmu.get_byte(i));
+        log::info!("Memory at {} is {}",i,mmu.try_get_byte(i)?);
     }
-
+    Ok(())
 }

src/misc/emulator_error.rs

@@ -0,0 +1,21 @@
+use std::fmt::Debug;
+
+#[derive(Debug)]
+pub enum DeviceType {
+    RAM,
+    MMU,
+    KEYBOARD,
+    AUDIO,
+    GRAPHICS,
+}
+
+#[derive(Debug)]
+pub enum EmulatorError {
+    AllocationError(DeviceType, &'static str),
+    UnreachableMemoryError(DeviceType, u32),
+}
+
+
+
+
+

src/misc/mod.rs

@@ -1 +1,3 @@
 pub mod endian;
+pub mod emulator_error;
+pub mod result;

src/misc/result.rs

@@ -0,0 +1,3 @@
+use crate::misc::emulator_error::EmulatorError;
+
+pub type EmulatorResult<T> = Result<T,EmulatorError>;