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||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
8
Cargo.toml
Normal file
8
Cargo.toml
Normal file
@ -0,0 +1,8 @@
|
||||
[package]
|
||||
name = "footvm"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
byteorder = "1"
|
||||
customasm = "0.13.9"
|
||||
42
src/foot.asm
Normal file
42
src/foot.asm
Normal file
@ -0,0 +1,42 @@
|
||||
#subruledef operand
|
||||
{
|
||||
#{immediate: s5} => 0b000 @ immediate
|
||||
r{register: u5} => 0b001 @ register
|
||||
[r{register: u5}++] => 0b010 @ register
|
||||
[r{register: u5}--] => 0b011 @ register
|
||||
[r{register: u5}] => 0b100 @ register
|
||||
[r{register: u5} + {offset: u2} => 0b1 @ offset @ register
|
||||
}
|
||||
|
||||
#subruledef crflags
|
||||
{
|
||||
. => 0b0000
|
||||
.l => 0b0010
|
||||
.le => 0b0100
|
||||
.e => 0b0110
|
||||
.ge => 0b1000
|
||||
.g => 0b1010
|
||||
.ne => 0b1100
|
||||
.r => 0b0001
|
||||
.rl => 0b0011
|
||||
.rle => 0b0101
|
||||
.re => 0b0111
|
||||
.rge => 0b1001
|
||||
.re => 0b1011
|
||||
.rne => 0b1101
|
||||
}
|
||||
|
||||
#ruledef
|
||||
{
|
||||
CNST{flags: crflags} {dst: operand}, {imm: i16} => imm @ 0b0000 @ flags @ dst
|
||||
}
|
||||
|
||||
#bankdef mem
|
||||
{
|
||||
#bits 16
|
||||
#addr 0
|
||||
#size 0x10000
|
||||
#outp 0
|
||||
}
|
||||
|
||||
#bank mem
|
||||
18
src/main.rs
Normal file
18
src/main.rs
Normal file
@ -0,0 +1,18 @@
|
||||
mod vm;
|
||||
|
||||
use vm::{FootVM};
|
||||
|
||||
fn main()
|
||||
{
|
||||
let mut vm = FootVM::new();
|
||||
vm[0] = 0xFEED;
|
||||
vm[1] = 0b0000_0000_001_00000;
|
||||
|
||||
let result = vm.load("CNST. r0, 0xBEEF", Some(&mut std::io::stderr()));
|
||||
if result.is_ok()
|
||||
{
|
||||
vm.cycle();
|
||||
|
||||
println!("{}", vm.registers[0]);
|
||||
}
|
||||
}
|
||||
574
src/vm.rs
Normal file
574
src/vm.rs
Normal file
@ -0,0 +1,574 @@
|
||||
use std::io::{Cursor};
|
||||
use std::ops::{Index, IndexMut};
|
||||
use AddressingMode::*;
|
||||
use ConditionalExecutionFlag::*;
|
||||
use Instruction::*;
|
||||
use byteorder::{BigEndian, ReadBytesExt};
|
||||
|
||||
const ASM_PREFIX: &str = include_str!("foot.asm");
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
enum ConditionalExecutionFlag
|
||||
{
|
||||
Always,
|
||||
LessThan,
|
||||
LessThanOrEqual,
|
||||
Equal,
|
||||
GreaterThanOrEqual,
|
||||
GreaterThan,
|
||||
NotEqual
|
||||
}
|
||||
|
||||
impl TryFrom<u32> for ConditionalExecutionFlag
|
||||
{
|
||||
type Error = ();
|
||||
|
||||
fn try_from(value: u32) -> Result<Self, Self::Error>
|
||||
{
|
||||
match value
|
||||
{
|
||||
0 => Ok(Always),
|
||||
1 => Ok(LessThan),
|
||||
2 => Ok(LessThanOrEqual),
|
||||
3 => Ok(Equal),
|
||||
4 => Ok(GreaterThanOrEqual),
|
||||
5 => Ok(GreaterThan),
|
||||
6 => Ok(NotEqual),
|
||||
_ => Err(())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
enum AddressingMode
|
||||
{
|
||||
Immediate,
|
||||
Direct,
|
||||
Indirect(u8),
|
||||
IndirectAutoIncrement,
|
||||
IndirectAutoDecrement
|
||||
}
|
||||
|
||||
impl TryFrom<u32> for AddressingMode
|
||||
{
|
||||
type Error = ();
|
||||
|
||||
fn try_from(value: u32) -> Result<Self, Self::Error>
|
||||
{
|
||||
match value
|
||||
{
|
||||
0 => Ok(Immediate),
|
||||
1 => Ok(Direct),
|
||||
2 => Ok(IndirectAutoIncrement),
|
||||
3 => Ok(IndirectAutoDecrement),
|
||||
4..8 => Ok(Indirect((value - 4) as u8)),
|
||||
_ => Err(())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
struct Operand
|
||||
{
|
||||
pub addressing_mode: AddressingMode,
|
||||
pub value: u8
|
||||
}
|
||||
|
||||
impl TryFrom<u32> for Operand
|
||||
{
|
||||
type Error = ();
|
||||
|
||||
fn try_from(value: u32) -> Result<Self, Self::Error>
|
||||
{
|
||||
match (value >> 5).try_into()
|
||||
{
|
||||
Ok(addressing_mode) => Ok(
|
||||
Operand
|
||||
{
|
||||
addressing_mode,
|
||||
value: (value as u8) & 0b00011111
|
||||
},
|
||||
),
|
||||
Err(_) => Err(())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
enum Instruction
|
||||
{
|
||||
CNST(ConditionalExecutionFlag, bool, Operand, u16),
|
||||
CMPR(ConditionalExecutionFlag, bool, Operand, Operand),
|
||||
BWNG(ConditionalExecutionFlag, bool, Operand, Operand),
|
||||
ARNG(ConditionalExecutionFlag, bool, Operand, Operand),
|
||||
LONG(ConditionalExecutionFlag, bool, Operand, Operand),
|
||||
BWOR(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
BAND(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
BXOR(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
URSH(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
SRSH(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
ZLSH(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
CLSH(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
ADDI(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
SUBT(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
MULT(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
DIVI(ConditionalExecutionFlag, bool, Operand, Operand, Operand),
|
||||
MODU(ConditionalExecutionFlag, bool, Operand, Operand, Operand)
|
||||
}
|
||||
|
||||
impl TryFrom<u32> for Instruction
|
||||
{
|
||||
type Error = ();
|
||||
|
||||
fn try_from(value: u32) -> Result<Self, Self::Error>
|
||||
{
|
||||
let ceflag: ConditionalExecutionFlag = (value >> 29).try_into()?;
|
||||
let rflag: bool = (value >> 28 & 1) == 1;
|
||||
let dst: Operand = (value >> 16).try_into()?;
|
||||
match value >> 24
|
||||
{
|
||||
0 => Ok(CNST(ceflag, rflag, dst, (value & 0xFFFF) as u16)),
|
||||
1 =>
|
||||
{
|
||||
let a: Operand = (value & 0xFF).try_into()?;
|
||||
match (value >> 8) & 0xFF
|
||||
{
|
||||
0 => Ok(CMPR(ceflag, rflag, dst, a)),
|
||||
1 => Ok(BWNG(ceflag, rflag, dst, a)),
|
||||
2 => Ok(ARNG(ceflag, rflag, dst, a)),
|
||||
3 => Ok(LONG(ceflag, rflag, dst, a)),
|
||||
_ => Err(())
|
||||
}
|
||||
}
|
||||
2..14 =>
|
||||
{
|
||||
let a: Operand = (value & 0xFF).try_into()?;
|
||||
let b: Operand = ((value >> 8) & 0xFF).try_into()?;
|
||||
match value >> 24
|
||||
{
|
||||
2 => Ok(BWOR(ceflag, rflag, dst, b, a)),
|
||||
3 => Ok(BAND(ceflag, rflag, dst, b, a)),
|
||||
4 => Ok(BXOR(ceflag, rflag, dst, b, a)),
|
||||
5 => Ok(URSH(ceflag, rflag, dst, b, a)),
|
||||
6 => Ok(SRSH(ceflag, rflag, dst, b, a)),
|
||||
7 => Ok(ZLSH(ceflag, rflag, dst, b, a)),
|
||||
8 => Ok(CLSH(ceflag, rflag, dst, b, a)),
|
||||
9 => Ok(ADDI(ceflag, rflag, dst, b, a)),
|
||||
10 => Ok(SUBT(ceflag, rflag, dst, b, a)),
|
||||
11 => Ok(MULT(ceflag, rflag, dst, b, a)),
|
||||
12 => Ok(DIVI(ceflag, rflag, dst, b, a)),
|
||||
13 => Ok(MODU(ceflag, rflag, dst, b, a)),
|
||||
_ => Err(())
|
||||
}
|
||||
},
|
||||
_ => Err(())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(PartialEq, Eq)]
|
||||
enum Status
|
||||
{
|
||||
Less,
|
||||
Equal,
|
||||
Greater
|
||||
}
|
||||
|
||||
const MEMORY_SIZE: usize = 1 << 16;
|
||||
|
||||
pub struct FootVM
|
||||
{
|
||||
memory: [u16; MEMORY_SIZE],
|
||||
pub registers: [u16; 32],
|
||||
status: Status
|
||||
}
|
||||
|
||||
macro_rules! run_instruction
|
||||
{
|
||||
($self:ident, $cef:ident, $rep:ident, $name:ident, $d:ident, $a:ident) =>
|
||||
{
|
||||
if $rep
|
||||
{
|
||||
while $self.should_repeat()
|
||||
{
|
||||
if $self.check($cef)
|
||||
{
|
||||
$self.$name($d, $a)
|
||||
}
|
||||
}
|
||||
}
|
||||
else if $self.check($cef)
|
||||
{
|
||||
$self.$name($d, $a)
|
||||
}
|
||||
};
|
||||
($self:ident, $cef:ident, $rep:ident, $name:ident, $d:ident, $a:ident, $b:ident) =>
|
||||
{
|
||||
if $rep
|
||||
{
|
||||
while $self.should_repeat()
|
||||
{
|
||||
if $self.check($cef)
|
||||
{
|
||||
$self.$name($d, $a, $b)
|
||||
}
|
||||
}
|
||||
}
|
||||
else if $self.check($cef)
|
||||
{
|
||||
$self.$name($d, $a, $b)
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
impl FootVM
|
||||
{
|
||||
pub fn new() -> FootVM
|
||||
{
|
||||
FootVM
|
||||
{
|
||||
memory: [0; MEMORY_SIZE],
|
||||
registers: [0; 32],
|
||||
status: Status::Equal
|
||||
}
|
||||
}
|
||||
|
||||
pub fn load(&mut self, asm_src: &str, write: Option<&mut dyn std::io::Write>) -> Result<(), ()>
|
||||
{
|
||||
let mut asm_src = asm_src.to_owned();
|
||||
asm_src.insert_str(0, ASM_PREFIX);
|
||||
let asm_src = asm_src;
|
||||
|
||||
let virtual_filename = "loaded";
|
||||
let mut report = customasm::diagn::Report::new();
|
||||
let mut fileserver = customasm::util::FileServerMock::new();
|
||||
fileserver.add(virtual_filename, asm_src);
|
||||
|
||||
let opts = customasm::asm::AssemblyOptions::new();
|
||||
|
||||
let assembly = customasm::asm::assemble(
|
||||
&mut report,
|
||||
&opts,
|
||||
&mut fileserver,
|
||||
&[virtual_filename]
|
||||
);
|
||||
|
||||
let binary = assembly.output.map(|o| o.format_binary()).ok_or_else(
|
||||
|| {
|
||||
match write
|
||||
{
|
||||
Some(w) => report.print_all(w, &mut fileserver, true),
|
||||
None => ()
|
||||
}
|
||||
}
|
||||
)?;
|
||||
|
||||
let mut cursor = Cursor::new(binary);
|
||||
let mut index = 0;
|
||||
|
||||
loop
|
||||
{
|
||||
match cursor.read_u16::<BigEndian>()
|
||||
{
|
||||
Ok(value) =>
|
||||
{
|
||||
self[index] = value;
|
||||
index += 1;
|
||||
},
|
||||
Err(_) => break
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn cycle(&mut self)
|
||||
{
|
||||
let first_word = self[self.program_counter()];
|
||||
let second_word = self[self.program_counter() + 1];
|
||||
match ((second_word as u32) << 16 | first_word as u32).try_into()
|
||||
{
|
||||
Ok(CNST(cef, rep, dst, imm)) =>
|
||||
run_instruction!(self, cef, rep, cnst, dst, imm),
|
||||
Ok(CMPR(cef, rep, a, b)) =>
|
||||
run_instruction!(self, cef, rep, cmpr, a, b),
|
||||
Ok(BWNG(cef, rep, dst, src)) =>
|
||||
run_instruction!(self, cef, rep, bwng, dst, src),
|
||||
Ok(ARNG(cef, rep, dst, src)) =>
|
||||
run_instruction!(self, cef, rep, arng, dst, src),
|
||||
Ok(LONG(cef, rep, dst, src)) =>
|
||||
run_instruction!(self, cef, rep, long, dst, src),
|
||||
Ok(BWOR(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, bwor, dst, a, b),
|
||||
Ok(BAND(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, band, dst, a, b),
|
||||
Ok(BXOR(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, bxor, dst, a, b),
|
||||
Ok(URSH(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, ursh, dst, a, b),
|
||||
Ok(SRSH(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, srsh, dst, a, b),
|
||||
Ok(ZLSH(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, zlsh, dst, a, b),
|
||||
Ok(CLSH(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, clsh, dst, a, b),
|
||||
Ok(ADDI(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, addi, dst, a, b),
|
||||
Ok(SUBT(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, subt, dst, a, b),
|
||||
Ok(MULT(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, mult, dst, a, b),
|
||||
Ok(DIVI(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, divi, dst, a, b),
|
||||
Ok(MODU(cef, rep, dst, b, a)) =>
|
||||
run_instruction!(self, cef, rep, modu, dst, a, b),
|
||||
Err(_) => ()
|
||||
}
|
||||
|
||||
*self.mut_program_counter() += 2;
|
||||
}
|
||||
|
||||
fn cnst(&mut self, dst: Operand, imm: u16)
|
||||
{
|
||||
self.store_operand(dst, imm)
|
||||
}
|
||||
|
||||
fn cmpr(&mut self, a: Operand, b: Operand)
|
||||
{
|
||||
let a = self.load_operand(a) as i16;
|
||||
let b = self.load_operand(b) as i16;
|
||||
|
||||
self.status = match a - b
|
||||
{
|
||||
..0 => Status::Less,
|
||||
0 => Status::Equal,
|
||||
1.. => Status::Greater
|
||||
}
|
||||
}
|
||||
|
||||
fn bwng(&mut self, dst: Operand, src: Operand)
|
||||
{
|
||||
let value = self.load_operand(src);
|
||||
self.store_operand(dst, !value)
|
||||
}
|
||||
|
||||
fn arng(&mut self, dst: Operand, src: Operand)
|
||||
{
|
||||
let a = self.load_operand(src);
|
||||
self.store_operand(dst, (-(a as i16)) as u16);
|
||||
}
|
||||
|
||||
fn long(&mut self, dst: Operand, src: Operand)
|
||||
{
|
||||
let a = self.load_operand(src);
|
||||
match a
|
||||
{
|
||||
0 => self.store_operand(dst, 1),
|
||||
_ => self.store_operand(dst, 0)
|
||||
}
|
||||
}
|
||||
|
||||
fn bwor(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, a | b);
|
||||
}
|
||||
|
||||
fn band(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, a & b);
|
||||
}
|
||||
|
||||
fn bxor(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, a ^ b);
|
||||
}
|
||||
|
||||
fn ursh(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, a >> b);
|
||||
}
|
||||
|
||||
fn srsh(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, ((a as i16) >> (b as i16)) as u16);
|
||||
}
|
||||
|
||||
fn zlsh(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, a << b);
|
||||
}
|
||||
|
||||
fn clsh(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, a.rotate_left(b as u32));
|
||||
}
|
||||
|
||||
fn addi(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, ((a as i16) + (b as i16)) as u16);
|
||||
}
|
||||
|
||||
fn subt(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, ((a as i16) - (b as i16)) as u16);
|
||||
}
|
||||
|
||||
fn mult(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, ((a as i16) * (b as i16)) as u16);
|
||||
}
|
||||
|
||||
fn divi(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, ((a as i16) / (b as i16)) as u16);
|
||||
}
|
||||
|
||||
fn modu(&mut self, dst: Operand, src_a: Operand, src_b: Operand)
|
||||
{
|
||||
let a = self.load_operand(src_a);
|
||||
let b = self.load_operand(src_b);
|
||||
self.store_operand(dst, ((a as i16) % (b as i16)) as u16);
|
||||
}
|
||||
|
||||
fn store_operand(&mut self, dst: Operand, value: u16)
|
||||
{
|
||||
match dst.addressing_mode
|
||||
{
|
||||
Immediate => (),
|
||||
Direct => self.registers[dst.value as usize] = value,
|
||||
Indirect(offset) =>
|
||||
{
|
||||
let ptr = self.registers[dst.value as usize] + offset as u16;
|
||||
self[ptr] = value
|
||||
}
|
||||
IndirectAutoIncrement =>
|
||||
{
|
||||
let ptr = self.registers[dst.value as usize];
|
||||
self[ptr] = value;
|
||||
self.registers[dst.value as usize] += 1;
|
||||
},
|
||||
IndirectAutoDecrement =>
|
||||
{
|
||||
let ptr = self.registers[dst.value as usize];
|
||||
self[ptr] = value;
|
||||
self.registers[dst.value as usize] -= 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn load_operand(&mut self, src: Operand) -> u16
|
||||
{
|
||||
match src.addressing_mode
|
||||
{
|
||||
Immediate => src.value as u16,
|
||||
Direct => self.registers[src.value as usize],
|
||||
Indirect(offset) => self[self.registers[src.value as usize] + offset as u16],
|
||||
IndirectAutoIncrement =>
|
||||
{
|
||||
let ptr = self.registers[src.value as usize];
|
||||
let retval = self[ptr];
|
||||
self.registers[src.value as usize] += 1;
|
||||
retval
|
||||
},
|
||||
IndirectAutoDecrement =>
|
||||
{
|
||||
let ptr = self.registers[src.value as usize];
|
||||
let retval = self[ptr];
|
||||
self.registers[src.value as usize] -= 1;
|
||||
retval
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn program_counter(&self) -> u16
|
||||
{
|
||||
self.registers[31]
|
||||
}
|
||||
|
||||
fn mut_program_counter(&mut self) -> &mut u16
|
||||
{
|
||||
&mut self.registers[31]
|
||||
}
|
||||
|
||||
fn stack_pointer(&self) -> u16
|
||||
{
|
||||
self.registers[30]
|
||||
}
|
||||
|
||||
fn loop_count(&self) -> u16
|
||||
{
|
||||
self.registers[29]
|
||||
}
|
||||
|
||||
fn mut_loop_count(&mut self) -> &mut u16
|
||||
{
|
||||
&mut self.registers[29]
|
||||
}
|
||||
|
||||
fn should_repeat(&mut self) -> bool
|
||||
{
|
||||
if self.loop_count() > 0
|
||||
{
|
||||
*self.mut_loop_count() -= 1;
|
||||
|
||||
true
|
||||
}
|
||||
else
|
||||
{
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
fn check(&self, cef: ConditionalExecutionFlag) -> bool
|
||||
{
|
||||
match cef
|
||||
{
|
||||
Always => true,
|
||||
LessThan => self.status == Status::Less,
|
||||
LessThanOrEqual => self.status == Status::Less || self.status == Status::Equal,
|
||||
Equal => self.status == Status::Equal,
|
||||
GreaterThanOrEqual => self.status == Status::Greater || self.status == Status::Equal,
|
||||
GreaterThan => self.status == Status::Greater,
|
||||
NotEqual => self.status != Status::Equal
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Index<u16> for FootVM
|
||||
{
|
||||
type Output = u16;
|
||||
|
||||
fn index(&self, index: u16) -> &Self::Output
|
||||
{
|
||||
&self.memory[index as usize]
|
||||
}
|
||||
}
|
||||
|
||||
impl IndexMut<u16> for FootVM
|
||||
{
|
||||
fn index_mut(&mut self, index: u16) -> &mut Self::Output
|
||||
{
|
||||
&mut self.memory[index as usize]
|
||||
}
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user