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@ -1,12 +1,13 @@
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#[repr(u8)]
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#[repr(u8)]
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pub enum OpCode {
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pub enum OpCode {
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Constant,
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Return,
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Return,
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}
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}
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type Value = f32;
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type Value = f32;
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pub struct Chunk {
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pub struct Chunk {
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code: Vec<OpCode>,
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code: Vec<u8>,
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constants: Vec<Value>,
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constants: Vec<Value>,
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}
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}
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@ -19,13 +20,16 @@ impl Chunk {
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}
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}
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// https://doc.rust-lang.org/nomicon/vec/vec-push-pop.html
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// https://doc.rust-lang.org/nomicon/vec/vec-push-pop.html
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pub fn write(&mut self, op_code: OpCode) {
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pub fn write(&mut self, byte: u8) {
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self.code.push(op_code);
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self.code.push(byte);
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}
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}
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pub fn add_constant(&mut self, value: Value) -> usize{
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pub fn add_constant(&mut self, value: Value) -> u8 {
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self.constants.push(value);
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self.constants.push(value);
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self.constants.len() - 1
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assert!(self.constants.len() <= u8::MAX.into(), "Too many constants");
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(self.constants.len() - 1) as u8
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}
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}
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pub fn disassemble(&self, name: &str) {
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pub fn disassemble(&self, name: &str) {
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@ -41,7 +45,9 @@ impl Chunk {
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print!("{:04} ", offset);
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print!("{:04} ", offset);
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match self.code[offset] {
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match self.code[offset] {
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OpCode::Return => self.simple_instruction("OP_RETURN", offset),
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0 => self.constant_instruction("OP_CONSTANT", offset),
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1 => self.simple_instruction("OP_RETURN", offset),
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_ => unreachable!(),
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}
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}
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}
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}
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@ -49,6 +55,13 @@ impl Chunk {
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println!("{}", name);
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println!("{}", name);
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offset + 1
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offset + 1
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}
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}
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fn constant_instruction(&self, name: &str, offset: usize) -> usize {
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let constant_index = self.code[offset+1];
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let value = self.constants[constant_index as usize];
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println!("{:<16} {:04} '{}'", name, constant_index, value);
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offset + 2
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}
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}
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}
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impl Default for Chunk {
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impl Default for Chunk {
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