Browse Source

intcode: decode opcode into proper structure/enums

master
Stefan Bühler 2 years ago
parent
commit
19b70128d3
  1. 118
      Cargo.lock
  2. 1
      shared/Cargo.toml
  3. 168
      shared/src/intcode.rs

118
Cargo.lock

@ -1,5 +1,35 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "backtrace"
version = "0.3.40"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "backtrace-sys"
version = "0.1.32"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"cc 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "cc"
version = "1.0.48"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "cfg-if"
version = "0.1.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "day1"
version = "0.1.0"
@ -43,6 +73,26 @@ name = "either"
version = "1.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "failure"
version = "0.1.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"backtrace 0.3.40 (registry+https://github.com/rust-lang/crates.io-index)",
"failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "failure_derive"
version = "0.1.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
"quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
"syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
"synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "itertools"
version = "0.8.2"
@ -51,10 +101,78 @@ dependencies = [
"either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "libc"
version = "0.2.66"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "proc-macro2"
version = "1.0.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "quote"
version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "rustc-demangle"
version = "0.1.16"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "shared"
version = "0.1.0"
dependencies = [
"failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "syn"
version = "1.0.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
"quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
"unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "synstructure"
version = "0.12.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
"quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
"syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
"unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "unicode-xid"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[metadata]
"checksum backtrace 0.3.40 (registry+https://github.com/rust-lang/crates.io-index)" = "924c76597f0d9ca25d762c25a4d369d51267536465dc5064bdf0eb073ed477ea"
"checksum backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6575f128516de27e3ce99689419835fce9643a9b215a14d2b5b685be018491"
"checksum cc 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)" = "f52a465a666ca3d838ebbf08b241383421412fe7ebb463527bba275526d89f76"
"checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
"checksum either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
"checksum failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "f8273f13c977665c5db7eb2b99ae520952fe5ac831ae4cd09d80c4c7042b5ed9"
"checksum failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0bc225b78e0391e4b8683440bf2e63c2deeeb2ce5189eab46e2b68c6d3725d08"
"checksum itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f56a2d0bc861f9165be4eb3442afd3c236d8a98afd426f65d92324ae1091a484"
"checksum libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)" = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
"checksum proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "9c9e470a8dc4aeae2dee2f335e8f533e2d4b347e1434e5671afc49b054592f27"
"checksum quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
"checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
"checksum syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)" = "dff0acdb207ae2fe6d5976617f887eb1e35a2ba52c13c7234c790960cdad9238"
"checksum synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "67656ea1dc1b41b1451851562ea232ec2e5a80242139f7e679ceccfb5d61f545"
"checksum unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"

1
shared/Cargo.toml

@ -7,3 +7,4 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
failure = "0.1.6"

168
shared/src/intcode.rs

@ -1,15 +1,80 @@
const OP_ADD: CELL = 1;
const OP_MUL: CELL = 2;
const OP_INPUT: CELL = 3;
const OP_OUTPUT: CELL = 4;
const OP_JUMP_IF_TRUE: CELL = 5;
const OP_JUMP_IF_FALSE: CELL = 6;
const OP_LESS_THAN: CELL = 7;
const OP_EQUAL: CELL = 8;
const OP_HALT: CELL = 99;
use failure::Error;
#[repr(u8)]
#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Debug)]
pub enum ParameterMode {
Position = 0,
Immediate = 1,
}
impl ParameterMode {
pub fn decode(code: CELL) -> Result<(Self, CELL), Error> {
let rem = code / 10;
let mode = match code % 10 {
0 => Self::Position,
1 => Self::Immediate,
m => failure::bail!("Unknown parameter mode: {}", m),
};
Ok((mode, rem))
}
}
#[repr(u8)]
#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Debug)]
pub enum Instruction {
Add = 1,
Mul = 2,
In = 3,
Out = 4,
JumpIfTrue = 5,
JumpIfFalse = 6,
LessThan = 7,
Equal = 8,
Halt = 99,
}
impl Instruction {
pub fn decode(opcode: CELL) -> Result<(Self, CELL), Error> {
let rem = opcode / 100;
let instr = match opcode % 100 {
1 => Self::Add,
2 => Self::Mul,
3 => Self::In,
4 => Self::Out,
5 => Self::JumpIfTrue,
6 => Self::JumpIfFalse,
7 => Self::LessThan,
8 => Self::Equal,
99 => Self::Halt,
n => failure::bail!("Unknown instruction code {}", n),
};
Ok((instr, rem))
}
}
#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Debug)]
pub struct OpCode {
pub instruction: Instruction,
pub modes: [ParameterMode; 3],
}
impl OpCode {
pub fn decode(opcode: CELL) -> Result<OpCode, Error> {
let (instruction, code) = Instruction::decode(opcode)?;
let (mode0, code) = ParameterMode::decode(code)?;
let (mode1, code) = ParameterMode::decode(code)?;
let (mode2, code) = ParameterMode::decode(code)?;
failure::ensure!(code == 0);
let modes = [mode0, mode1, mode2];
Ok(OpCode {
instruction,
modes,
})
}
}
pub type CELL = i64;
type Mode = u8;
#[derive(PartialEq, Eq, Clone, Debug)]
pub enum SimulateStep {
@ -39,97 +104,102 @@ impl SimulateStep {
#[derive(PartialEq, Eq, Clone, Debug)]
pub struct IntCode {
/// instruction pointer
pub ip: usize,
/// next value to use for an "IN" (3) instruction (which will clear it)
pub next_input: Option<CELL>,
/// memory of machine (both code and data)
pub data: Vec<CELL>,
}
impl IntCode {
#[inline(always)]
fn fetch(&mut self, mode: Mode) -> CELL {
fn fetch(&mut self, modes: &mut &[ParameterMode]) -> CELL {
let mode = modes[0];
*modes = &modes[1..];
let imm = self.data[self.ip];
self.ip += 1;
match mode {
1 => imm,
_ => self.data[imm as usize],
ParameterMode::Position => self.data[imm as usize],
ParameterMode::Immediate => imm,
}
}
#[inline(always)]
fn store(&mut self, mode: Mode, value: CELL) {
fn store(&mut self, modes: &mut &[ParameterMode], value: CELL) {
let mode = modes[0];
*modes = &modes[1..];
let addr = self.ip;
self.ip += 1;
match mode {
1 => self.data[addr] = value,
_ => {
ParameterMode::Immediate => self.data[addr] = value,
ParameterMode::Position => {
let addr = self.data[addr] as usize;
self.data[addr] = value;
},
}
}
fn binop<F>(&mut self, op: F, modes: [Mode; 3])
fn binop<F>(&mut self, op: F, modes: &mut &[ParameterMode])
where
F: FnOnce(CELL, CELL) -> CELL,
{
let src1 = self.fetch(modes[0]);
let src2 = self.fetch(modes[1]);
self.store(modes[2], op(src1, src2));
let src1 = self.fetch(modes);
let src2 = self.fetch(modes);
self.store(modes, op(src1, src2));
}
/// run simple machine without I/O to completion
pub fn simulate(&mut self) {
assert_eq!(self.ip, 0);
assert!(self.next_input.is_none());
self.simulate_step().expect_finished();
}
/// run a machine until:
/// - it needs input, but `next_input` is `None`
/// - it outputs a value
/// - it finishes
pub fn simulate_step(&mut self) -> SimulateStep {
loop {
let modes = self.data[self.ip];
let opcode = OpCode::decode(self.data[self.ip]).unwrap();
let modes = &mut &opcode.modes[..];
self.ip += 1;
let op = modes % 100;
let modes = modes / 100;
let mode1 = (modes % 10) as Mode;
let modes = modes / 10;
let mode2 = (modes % 10) as Mode;
let modes = modes / 10;
let mode3 = (modes % 10) as Mode;
let modes = [mode1, mode2, mode3];
match op {
OP_ADD => self.binop(|a, b| a + b, modes),
OP_MUL => self.binop(|a, b| a * b, modes),
OP_LESS_THAN => self.binop(|a, b| if a < b { 1 } else { 0 }, modes),
OP_EQUAL => self.binop(|a, b| if a == b { 1 } else { 0 }, modes),
OP_INPUT => {
match opcode.instruction {
Instruction::Add => self.binop(|a, b| a + b, modes),
Instruction::Mul => self.binop(|a, b| a * b, modes),
Instruction::LessThan => self.binop(|a, b| if a < b { 1 } else { 0 }, modes),
Instruction::Equal => self.binop(|a, b| if a == b { 1 } else { 0 }, modes),
Instruction::In => {
if let Some(v) = self.next_input.take() {
self.store(mode1, v);
self.store(modes, v);
} else {
self.ip -= 1; // go back to opcode
return SimulateStep::WaitForInput;
}
},
OP_OUTPUT => {
return SimulateStep::Output(self.fetch(mode1));
Instruction::Out => {
return SimulateStep::Output(self.fetch(modes));
},
OP_HALT => {
Instruction::Halt => {
self.ip -= 1; // make re-running this step end up here again
return SimulateStep::Finished;
},
OP_JUMP_IF_TRUE => {
if self.fetch(mode1) != 0 {
self.ip = self.fetch(mode2) as usize;
Instruction::JumpIfTrue => {
if self.fetch(modes) != 0 {
self.ip = self.fetch(modes) as usize;
} else {
self.ip += 1; // skip target
self.ip += 1; // skip parameter for target
}
},
OP_JUMP_IF_FALSE => {
if self.fetch(mode1) == 0 {
self.ip = self.fetch(mode2) as usize;
Instruction::JumpIfFalse => {
if self.fetch(modes) == 0 {
self.ip = self.fetch(modes) as usize;
} else {
self.ip += 1; // skip target
self.ip += 1; // skip parameter for target
}
},
_ => panic!("invalid opcode: {}", op),
}
}
}

Loading…
Cancel
Save