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feat(tazjin/rlox): Bootstrap VM for Lox bytecode

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Change-Id: I479e20bf2087e5c4aa20e31b364c57ed0d961bcf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2416
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
This commit is contained in:
Vincent Ambo 2021-01-17 23:03:41 +03:00 • committed by tazjin
parent b1d0e22b1f
commit 7fb93fb490
7 changed files with 89 additions and 25 deletions
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27
users/tazjin/rlox/src/bytecode/chunk.rs
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@ -10,7 +10,7 @@ use super::value;
// problem.
#[derive(Debug, Default)]
pub struct Chunk {
code: Vec<OpCode>,
pub code: Vec<OpCode>,
lines: Vec<Span>,
constants: Vec<value::Value>,
}
@ -38,6 +38,10 @@ impl Chunk {
idx
}
pub fn constant(&self, idx: usize) -> &value::Value {
self.constants.index(idx)
}
fn add_line(&mut self, line: usize) {
match self.lines.last_mut() {
Some(span) if span.line == line => span.count += 1,
@ -58,26 +62,11 @@ impl Chunk {
}
}
impl Index<usize> for Chunk {
type Output = OpCode;
fn index(&self, offset: usize) -> &Self::Output {
self.code.index(offset)
}
}
// Disassembler
pub fn disassemble(chunk: &Chunk, name: &str) {
println!("== {} ==", name);
for (idx, _) in chunk.code.iter().enumerate() {
disassemble_instruction(chunk, idx);
}
}
/// Print a single disassembled instruction at the specified offset.
/// Some instructions are printed "raw", others have special handling.
fn disassemble_instruction(chunk: &Chunk, offset: usize) {
pub fn disassemble_instruction(chunk: &Chunk, offset: usize) {
print!("{:04} ", offset);
let line = chunk.get_line(offset);
@ -87,8 +76,8 @@ fn disassemble_instruction(chunk: &Chunk, offset: usize) {
print!("{:4} ", line);
}
match &chunk[offset] {
OpCode::OpConstant(idx) => println!("OpConstant idx '{:?}'", chunk.constants[*idx]),
match chunk.code.index(offset) {
OpCode::OpConstant(idx) => println!("OpConstant({}) '{:?}'", *idx, chunk.constant(*idx)),
op => println!("{:?}", op),
}
}