forked from AbleOS/holey-bytes
96 lines
2.9 KiB
Rust
96 lines
2.9 KiB
Rust
#![feature(iter_next_chunk)]
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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println!("cargo:rerun-if-changed=build.rs");
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println!("cargo:rerun-if-changed=../hbbytecode/instructions.in");
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let instructions = include_str!("../hbbytecode/instructions.in");
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let mut generated = String::new();
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use std::fmt::Write;
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writeln!(&mut generated, "impl crate::codegen::Func {{")?;
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for line in instructions.lines() {
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let line = line.strip_suffix(";").unwrap();
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let [opcode, name, ty, doc] = line.splitn(4, ',').map(str::trim).next_chunk().unwrap();
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writeln!(&mut generated, "/// {}", doc.trim_matches('"'))?;
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write!(&mut generated, "pub fn {}(&mut self", name.to_lowercase())?;
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for (i, c) in ty.chars().enumerate() {
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let (name, ty) = match c {
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'N' => continue,
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'R' => ("reg", "u8"),
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'B' => ("imm", "u8"),
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'H' => ("imm", "u16"),
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'W' => ("imm", "u32"),
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'D' => ("imm", "u64"),
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'P' => ("offset", "u32"),
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'O' => ("offset", "u32"),
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'A' => ("addr", "u64"),
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_ => panic!("unknown type: {}", c),
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};
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write!(&mut generated, ", {name}{i}: {ty}")?;
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}
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writeln!(&mut generated, ") {{")?;
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let mut offset = 1;
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for (i, c) in ty.chars().enumerate() {
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let width = match c {
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'N' => 0,
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'R' => 1,
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'B' => 1,
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'H' => 2,
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'W' => 4,
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'D' => 8,
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'A' => 8,
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'P' => 2,
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'O' => 4,
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_ => panic!("unknown type: {}", c),
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};
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if matches!(c, 'P' | 'O') {
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writeln!(
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&mut generated,
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" self.offset(offset{i}, {offset}, {width});",
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)?;
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}
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offset += width;
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}
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write!(
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&mut generated,
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" self.extend(crate::as_bytes(&crate::Args({opcode}"
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)?;
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for (i, c) in ty.chars().enumerate() {
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let name = match c {
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'N' => continue,
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'R' => "reg",
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'B' | 'H' | 'W' | 'D' => "imm",
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'P' => "0u16",
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'O' => "0u32",
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'A' => "addr",
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_ => panic!("unknown type: {}", c),
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};
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if matches!(c, 'P' | 'O') {
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write!(&mut generated, ", {name}")?;
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} else {
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write!(&mut generated, ", {name}{i}")?;
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}
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}
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for _ in ty.len() - (ty == "N") as usize..4 {
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write!(&mut generated, ", ()")?;
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}
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writeln!(&mut generated, ")));")?;
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writeln!(&mut generated, "}}")?;
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}
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writeln!(&mut generated, "}}")?;
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std::fs::write("src/instrs.rs", generated)?;
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Ok(())
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}
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