771 lines
25 KiB
Rust
771 lines
25 KiB
Rust
use std::collections::HashMap;
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use std::fs::File;
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use std::io::Write;
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use std::ops::Range;
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use std::process::{Command, Stdio};
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use std::str::FromStr;
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use itertools::Itertools;
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use proc_macro2::{Group, Ident, Literal, Span, TokenStream, TokenTree};
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use quote::quote;
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use serde::{Deserialize, Deserializer};
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use syn::{LitChar, LitInt, LitStr};
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macro_rules! token_stream {
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($stream:ident) => {
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TokenStream::from_iter($stream.into_iter())
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};
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}
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fn main() {
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if let Err(err) = _main() {
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eprintln!("{}", err);
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std::process::exit(1);
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}
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}
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type Error = Box<dyn std::error::Error>;
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type Result<T> = std::result::Result<T, Error>;
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fn _main() -> Result<()> {
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let isa = load_isa()?;
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let mut unformatted_code = Vec::<u8>::new();
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writeln!(
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&mut unformatted_code,
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"{}",
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quote! {
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use crate::prelude::*;
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}
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)?;
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writeln!(&mut unformatted_code, "{}", isa.gen_opcode_enum()?)?;
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writeln!(&mut unformatted_code, "{}", isa.gen_field_enum()?)?;
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writeln!(&mut unformatted_code, "{}", isa.gen_field_impl()?)?;
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writeln!(&mut unformatted_code, "{}", isa.gen_ins_impl()?)?;
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let formatted_code = rustfmt(unformatted_code);
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File::create("./disasm/src/generated.rs")?.write_all(&formatted_code)?;
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Ok(())
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}
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fn rustfmt(code: Vec<u8>) -> Vec<u8> {
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let mut rustfmt = Command::new("rustfmt")
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.spawn()
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.expect("failed to spawn rustfmt");
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let mut stdin = rustfmt.stdin.take().unwrap();
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std::thread::spawn(move || {
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let _ = stdin.write_all(&code);
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});
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let rustfmt_res = rustfmt.wait_with_output().expect("failed to run rustfmt");
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if !rustfmt_res.status.success() {
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panic!("rustfmt failed");
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}
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rustfmt_res.stdout
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}
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#[derive(Default)]
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pub(crate) struct BitRange(Range<u8>);
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impl<'de> Deserialize<'de> for BitRange {
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fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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let range_str: String = Deserialize::deserialize(deserializer)?;
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if let Some((start_str, stop_str)) = range_str.split_once("..") {
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let start = start_str.parse::<u8>().map_err(serde::de::Error::custom)?;
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let stop = stop_str.parse::<u8>().map_err(serde::de::Error::custom)?;
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Ok(Self(start..stop))
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} else {
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let bit_idx = range_str.parse::<u8>().map_err(serde::de::Error::custom)?;
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Ok(Self(bit_idx..bit_idx))
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}
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}
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}
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#[derive(Deserialize, Default)]
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#[serde(default)]
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pub(crate) struct Field {
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name: String,
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desc: String,
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bits: BitRange,
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signed: bool,
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split: bool,
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arg: Option<String>,
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shift_left: u8,
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}
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impl Field {
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fn variant_identifier(&self) -> Option<TokenTree> {
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self.identifier("")
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}
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fn identifier(&self, prefix: &str) -> Option<TokenTree> {
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if self.name.strip_suffix(".nz").is_none() {
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Some(to_rust_ident(prefix, &self.name))
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} else {
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None
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}
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}
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fn express_value(&self, code: TokenStream) -> TokenStream {
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let mut val = quote!(#code);
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let shift = 32 - self.bits.0.end;
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if shift > 0 {
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val = quote!((#val >> #shift));
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}
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let mask = (1u32 << self.bits.0.len()) - 1;
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if mask != 0xFFFF_FFFF {
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let mask = LitInt::new(&format!("0x{:x}", mask), Span::call_site());
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val = quote!((#val & #mask));
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}
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if self.split {
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val = quote!((((#val & 0b11111_00000u32) >> 5u32) | ((#val & 0b00000_11111u32) << 5u32)) as u32);
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}
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// https://graphics.stanford.edu/~seander/bithacks.html#VariableSignExtend
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if self.signed {
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let mask2 = 1u32 << (self.bits.0.len() - 1);
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let mask2 = LitInt::new(&format!("0x{:x}", mask2), Span::call_site());
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val = quote!((((#val ^ #mask2).wrapping_sub(#mask2)) as i32))
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}
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let val_shift = self.shift_left;
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if val_shift > 0 {
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val = quote!((#val << #val_shift));
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}
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val
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}
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fn express_value_self(&self) -> TokenStream {
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self.express_value(quote!(self.code))
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}
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fn enum_variant_definition(&self) -> Option<TokenStream> {
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let ident = self.variant_identifier()?;
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Some(if let Some(arg) = &self.arg {
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let arg = TokenTree::Ident(Ident::new(arg, Span::call_site()));
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quote! {
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#ident(#arg),
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}
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} else {
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quote! {
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#ident,
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}
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})
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}
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pub(crate) fn construct_variant(&self, code: TokenStream) -> TokenStream {
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let field_variant = self.variant_identifier();
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if let Some(arg) = &self.arg {
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let field_arg = TokenTree::Ident(Ident::new(arg, Span::call_site()));
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let value = self.express_value(code);
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quote! {
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Field::#field_variant(#field_arg(#value as _))
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}
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} else {
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quote! {
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Field::#field_variant
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}
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}
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}
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fn construct_variant_self(&self) -> TokenStream {
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self.construct_variant(quote!(self.code))
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}
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fn construct_accessor(&self) -> TokenStream {
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let field_variant = match self.identifier("field_") {
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Some(v) => v,
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None => return TokenStream::new(),
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};
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if self.arg.is_none() {
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return TokenStream::new();
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}
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let value = self.express_value_self();
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let ret_type = if self.signed {
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quote!(isize)
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} else {
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quote!(usize)
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};
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quote! {
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#[inline(always)]
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pub fn #field_variant(&self) -> #ret_type {
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#value as _
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}
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}
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}
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}
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#[derive(Deserialize, Default)]
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#[serde(default)]
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pub(crate) struct Opcode {
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name: String,
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desc: String,
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bitmask: u32,
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pattern: u32,
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modifiers: Vec<String>,
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side_effects: Vec<String>,
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args: Vec<String>,
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defs: Vec<String>,
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uses: Vec<String>,
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}
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impl Opcode {
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fn variant_identifier(&self) -> Result<TokenTree> {
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to_rust_variant(&self.name)
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}
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}
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#[derive(Deserialize, Default)]
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#[serde(default)]
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pub(crate) struct Mnemonic {
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name: String,
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opcode: String,
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// Overrides modifier list from opcode
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modifiers: Option<Vec<String>>,
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args: Vec<String>,
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condition: String,
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}
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#[derive(Deserialize, Default)]
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#[serde(default)]
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pub(crate) struct Modifier {
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name: String,
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suffix: char,
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bit: u8,
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condition: String,
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}
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impl Modifier {
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fn express_value_self(&self, field_by_name: &HashMap<String, &Field>) -> Result<TokenStream> {
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if self.condition.is_empty() {
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let modifier_bit = self.bit as usize;
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Ok(quote!(self.bit(#modifier_bit)))
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} else {
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compile_mnemonic_condition(
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field_by_name,
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&self.condition,
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)
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}
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}
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fn construct_accessor(&self, field_by_name: &HashMap<String, &Field>) -> Result<TokenStream> {
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let field_variant = to_rust_ident("field_", &self.name);
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let value = self.express_value_self(field_by_name)?;
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Ok(quote! {
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#[inline(always)]
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pub fn #field_variant(&self) -> bool {
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#value
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}
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})
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}
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}
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#[derive(Deserialize, Default)]
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#[serde(default)]
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pub(crate) struct Isa {
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fields: Vec<Field>,
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modifiers: Vec<Modifier>,
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opcodes: Vec<Opcode>,
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mnemonics: Vec<Mnemonic>,
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}
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fn load_isa() -> Result<Isa> {
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let yaml_file = File::open("isa.yaml")?;
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let isa: Isa = serde_yaml::from_reader(yaml_file)?;
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Ok(isa)
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}
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impl Isa {
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fn gen_opcode_enum(&self) -> Result<TokenStream> {
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// Create enum variants.
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let enum_variants = self
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.opcodes
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.iter()
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.map(|opcode| -> Result<TokenStream> {
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let ident = opcode.variant_identifier()?;
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Ok(quote! {
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#ident,
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})
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})
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.try_collect::<TokenStream, Vec<TokenStream>, Error>()?;
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let enum_variants = token_stream!(enum_variants);
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// Create functions.
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let mnemonic_fn = self.gen_mnemonic_fn()?;
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let detect_fn = self.gen_opcode_detect()?;
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// Create final enum.
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let opcode_enum = quote! {
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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pub enum Opcode {
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Illegal = -1,
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#enum_variants
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}
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#[allow(clippy::all)]
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impl Opcode {
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#mnemonic_fn
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#detect_fn
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}
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};
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Ok(opcode_enum)
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}
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fn gen_mnemonic_fn(&self) -> Result<TokenStream> {
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// Create match arms.
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let match_arms = self
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.opcodes
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.iter()
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.map(|opcode| {
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let variant = opcode.variant_identifier()?;
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let literal = Literal::string(&opcode.name);
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Ok(quote! {
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Opcode::#variant => #literal,
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})
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})
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.try_collect::<TokenStream, Vec<TokenStream>, Error>()?;
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let match_arms = token_stream!(match_arms);
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// Create final function.
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let mnemonic_fn = quote! {
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pub(crate) fn _mnemonic(self) -> &'static str {
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match self {
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Opcode::Illegal => "<illegal>",
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#match_arms
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}
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}
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};
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Ok(mnemonic_fn)
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}
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fn gen_opcode_detect(&self) -> Result<TokenStream> {
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// Generate if chain.
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let if_chain = self
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.opcodes
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.iter()
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.map(|opcode| {
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let bitmask_str = format!("{:>#8x}", opcode.bitmask);
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let bitmask = LitInt::new(&bitmask_str, Span::call_site());
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let pattern_str = format!("{:>#8x}", opcode.pattern);
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let pattern = LitInt::new(&pattern_str, Span::call_site());
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let identifier = opcode.variant_identifier()?;
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Ok(quote! {
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if code & #bitmask == #pattern {
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return Opcode::#identifier;
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}
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})
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})
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.try_collect::<TokenStream, Vec<TokenStream>, Error>()?;
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let if_chain = token_stream!(if_chain);
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// Generate function.
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let func = quote! {
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pub(crate) fn _detect(code: u32) -> Self {
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#if_chain
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Opcode::Illegal
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}
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};
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Ok(func)
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}
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fn gen_field_enum(&self) -> Result<TokenStream> {
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// Create enum variants.
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let mut enum_variants = Vec::new();
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for field in &self.fields {
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if let Some(field) = field.enum_variant_definition() {
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enum_variants.push(field);
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}
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}
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let enum_variants = token_stream!(enum_variants);
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// Create final enum.
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let field_enum = quote! {
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#[allow(non_camel_case_types)]
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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pub enum Field {
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#enum_variants
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}
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};
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Ok(field_enum)
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}
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fn gen_field_argument(&self) -> Result<TokenStream> {
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let mut match_arms = Vec::new();
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for field in &self.fields {
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if let Some(variant) = field.variant_identifier() {
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if let Some(arg_str) = field.arg.as_ref() {
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let arg = Ident::new(arg_str, Span::call_site());
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match_arms.push(quote! { Field::#variant(x) => Some(Argument::#arg(*x)), });
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}
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}
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}
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let match_arms = token_stream!(match_arms);
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Ok(quote! {
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pub fn argument(&self) -> Option<Argument> {
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match self {
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#match_arms
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_ => None,
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}
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}
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})
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}
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fn gen_field_name(&self) -> Result<TokenStream> {
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let mut match_arms = Vec::new();
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for field in &self.fields {
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if let Some(variant) = field.variant_identifier() {
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let name = LitStr::new(&variant.to_string(), Span::call_site());
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let arg = field.arg.as_ref().map(|_| quote!((_)));
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match_arms.push(quote! { Field::#variant #arg => #name, });
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}
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}
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let match_arms = token_stream!(match_arms);
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Ok(quote! {
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pub fn name(&self) -> &'static str {
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match self {
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#match_arms
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}
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}
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})
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}
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fn gen_field_impl(&self) -> Result<TokenStream> {
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let field_argument = self.gen_field_argument()?;
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let field_name = self.gen_field_name()?;
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Ok(quote! {
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impl Field {
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#field_argument
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#field_name
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}
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})
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}
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fn gen_ins_impl(&self) -> Result<TokenStream> {
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// Map fields by name.
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let mut field_by_name = HashMap::<String, &Field>::new();
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for field in &self.fields {
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field_by_name.insert(field.name.clone(), field);
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}
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let mut modifier_by_name = HashMap::<String, &Modifier>::new();
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for modifier in &self.modifiers {
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modifier_by_name.insert(modifier.name.clone(), modifier);
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}
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// Map mnemonics by opcode.
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let mut mnemonics_by_opcode = HashMap::<&String, Vec<&Mnemonic>>::new();
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for simple in &self.mnemonics {
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mnemonics_by_opcode
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.entry(&simple.opcode)
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.or_insert_with(Vec::new)
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.push(simple)
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}
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// Generate match arms for each opcode.
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let mut field_match_arms = Vec::new();
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let mut def_match_arms = Vec::new();
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let mut use_match_arms = Vec::new();
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let mut suffix_match_arms = Vec::new();
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let mut simplified_ins_match_arms = Vec::new();
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for opcode in &self.opcodes {
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// Generate fields of opcode.
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let mut fields = Vec::new();
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for arg in &opcode.args {
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let field: &Field = field_by_name
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.get(arg)
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.ok_or_else(|| Error::from(format!("undefined field {}", arg)))?;
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let variant = field.construct_variant_self();
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fields.extend(quote! { #variant, })
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}
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let fields = token_stream!(fields);
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// Emit match arm.
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let ident = opcode.variant_identifier()?;
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field_match_arms.push(quote! {
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Opcode::#ident => vec![#fields],
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});
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// Generate modifiers.
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let suffix = express_suffix(&modifier_by_name, &field_by_name, &opcode.modifiers)?;
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suffix_match_arms.push(quote! {
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Opcode::#ident => #suffix,
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});
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// Generate defs.
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let mut defs = Vec::new();
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for arg in &opcode.defs {
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let field: &Field = field_by_name.get(arg).ok_or_else(|| {
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syn::Error::new(Span::call_site(), format!("undefined field {}", arg))
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})?;
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let variant = field.construct_variant_self();
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defs.extend(quote! { #variant, })
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}
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let defs = token_stream!(defs);
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let ident = opcode.variant_identifier()?;
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def_match_arms.push(quote! {
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Opcode::#ident => vec![#defs],
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});
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// Generate uses.
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let mut uses = Vec::new();
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let mut special_uses = Vec::new();
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for arg in &opcode.uses {
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// Detect non-zero modifier.
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let mut arg = arg.as_str();
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let mut non_zero = false;
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if let Some(substr) = arg.strip_suffix(".nz") {
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non_zero = true;
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arg = substr;
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}
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// Get underlying field.
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let field: &Field = field_by_name.get(arg).ok_or_else(|| {
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syn::Error::new(Span::call_site(), format!("undefined field {}", arg))
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})?;
|
|
let variant = field.construct_variant_self();
|
|
if non_zero {
|
|
let value = field.express_value_self();
|
|
special_uses.extend(quote! {
|
|
if (#value) != 0 {
|
|
uses.push(#variant);
|
|
}
|
|
})
|
|
} else {
|
|
uses.extend(quote! {
|
|
#variant,
|
|
})
|
|
}
|
|
}
|
|
let uses = token_stream!(uses);
|
|
let ident = opcode.variant_identifier()?;
|
|
let special_uses = token_stream!(special_uses);
|
|
use_match_arms.push(quote! {
|
|
Opcode::#ident => {
|
|
let mut uses = vec![#uses];
|
|
#special_uses
|
|
uses
|
|
},
|
|
});
|
|
|
|
// Generate instruction simplification.
|
|
if let Some(mnemonics) = mnemonics_by_opcode.get(&opcode.name) {
|
|
let mut simplified_conditions = Vec::new();
|
|
for mnemonic in mnemonics {
|
|
if mnemonic.condition.is_empty() {
|
|
continue; // TODO else branch
|
|
}
|
|
simplified_conditions.push(quote!(if));
|
|
simplified_conditions.push(compile_mnemonic_condition(
|
|
&field_by_name,
|
|
&mnemonic.condition,
|
|
)?);
|
|
// Emit branch.
|
|
let mnemonic_lit = LitStr::new(&mnemonic.name, Span::call_site());
|
|
// Emit suffix.
|
|
let modifiers = mnemonic.modifiers.as_ref().unwrap_or(&opcode.modifiers);
|
|
let suffix = express_suffix(&modifier_by_name, &field_by_name, modifiers)?;
|
|
// Extract arguments.
|
|
let mut args = Vec::new();
|
|
for arg in &mnemonic.args {
|
|
let (field_name, expression) = arg.split_once('=').unwrap_or((arg, arg));
|
|
let field = field_by_name
|
|
.get(field_name)
|
|
.unwrap_or_else(|| panic!("field not found: {}", arg));
|
|
let variant = Ident::new(field.arg.as_ref().unwrap(), Span::call_site());
|
|
let value = compile_mnemonic_condition(
|
|
&field_by_name,
|
|
expression,
|
|
)?;
|
|
args.push(quote!(Argument::#variant(#variant((#value) as _)),));
|
|
}
|
|
let args = token_stream!(args);
|
|
simplified_conditions.push(quote! {
|
|
{
|
|
return SimplifiedIns {
|
|
mnemonic: #mnemonic_lit,
|
|
suffix: #suffix,
|
|
args: vec![#args],
|
|
ins: self,
|
|
};
|
|
}
|
|
});
|
|
}
|
|
let simplified_conditions = token_stream!(simplified_conditions);
|
|
simplified_ins_match_arms.push(quote! {
|
|
Opcode::#ident => {
|
|
#simplified_conditions
|
|
},
|
|
});
|
|
}
|
|
}
|
|
let field_match_arms = token_stream!(field_match_arms);
|
|
let def_match_arms = token_stream!(def_match_arms);
|
|
let use_match_arms = token_stream!(use_match_arms);
|
|
let suffix_match_arms = token_stream!(suffix_match_arms);
|
|
let simplified_ins_match_arms = token_stream!(simplified_ins_match_arms);
|
|
let field_accessors =
|
|
TokenStream::from_iter(self.fields.iter().map(|field| field.construct_accessor()));
|
|
let modifiers: Vec<TokenStream> = self.modifiers
|
|
.iter()
|
|
.map(|modifier| modifier.construct_accessor(&field_by_name)).try_collect()?;
|
|
let modifier_accessors = TokenStream::from_iter(modifiers);
|
|
// Generate final fields function.
|
|
let ins_impl = quote! {
|
|
#[allow(clippy::all, unused_mut)]
|
|
impl Ins {
|
|
pub(crate) fn _fields(&self) -> Vec<Field> {
|
|
match self.op {
|
|
Opcode::Illegal => vec![],
|
|
#field_match_arms
|
|
}
|
|
}
|
|
|
|
pub(crate) fn _defs(&self) -> Vec<Field> {
|
|
match self.op {
|
|
Opcode::Illegal => vec![],
|
|
#def_match_arms
|
|
}
|
|
}
|
|
|
|
pub(crate) fn _uses(&self) -> Vec<Field> {
|
|
match self.op {
|
|
Opcode::Illegal => vec![],
|
|
#use_match_arms
|
|
}
|
|
}
|
|
|
|
pub(crate) fn _suffix(&self) -> String {
|
|
match self.op {
|
|
Opcode::Illegal => String::new(),
|
|
#suffix_match_arms
|
|
}
|
|
}
|
|
|
|
pub(crate) fn _simplified(self) -> SimplifiedIns {
|
|
match self.op {
|
|
#simplified_ins_match_arms
|
|
_ => {}
|
|
}
|
|
SimplifiedIns::basic_form(self)
|
|
}
|
|
}
|
|
#[allow(clippy::all, non_snake_case)]
|
|
impl Ins {
|
|
#field_accessors
|
|
#modifier_accessors
|
|
}
|
|
};
|
|
Ok(ins_impl)
|
|
}
|
|
}
|
|
|
|
/// Converts the given key into an identifier.
|
|
fn to_rust_ident(prefix: &str, key: &str) -> TokenTree {
|
|
TokenTree::Ident(Ident::new(
|
|
&(prefix.to_owned() + &key.replace('.', "_")),
|
|
Span::call_site(),
|
|
))
|
|
}
|
|
|
|
/// Converts the given key into an enum variant key.
|
|
fn to_rust_variant(key: &str) -> Result<TokenTree> {
|
|
Ok(TokenTree::Ident(Ident::new(
|
|
&to_rust_variant_str(key)?,
|
|
Span::call_site(),
|
|
)))
|
|
}
|
|
|
|
fn to_rust_variant_str(key: &str) -> Result<String> {
|
|
let mut s = String::new();
|
|
let mut chars = key.chars();
|
|
loop {
|
|
// Make first char uppercase.
|
|
let c = match chars.next() {
|
|
None => return Ok(s),
|
|
Some(c) => c,
|
|
};
|
|
s.push(match c {
|
|
'a'..='z' => c.to_ascii_uppercase(),
|
|
'A'..='Z' => c,
|
|
_ => return Err(format!("invalid identifier: {}", key).into()),
|
|
});
|
|
loop {
|
|
let c = match chars.next() {
|
|
None => return Ok(s),
|
|
Some(c) => c,
|
|
};
|
|
match c.to_ascii_lowercase() {
|
|
'0'..='9' | 'a'..='z' => s.push(c),
|
|
'_' => break,
|
|
'.' => {
|
|
s.push('_');
|
|
break;
|
|
}
|
|
_ => return Err(format!("invalid character in opcode name: {}", key).into()),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Compiles conditions such as `S == B` into valid Rust expressions on a PowerPC instruction.
|
|
fn compile_mnemonic_condition(
|
|
field_by_name: &HashMap<String, &Field>,
|
|
code: &str,
|
|
) -> Result<TokenStream> {
|
|
let src_stream = TokenStream::from_str(code)?;
|
|
fn map_ident(field_by_name: &HashMap<String, &Field>, token: TokenTree) -> TokenStream {
|
|
match token {
|
|
TokenTree::Ident(ref ident) => {
|
|
if let Some(field) = field_by_name.get(&ident.to_string()) {
|
|
return field.express_value_self();
|
|
}
|
|
}
|
|
TokenTree::Group(ref group) => {
|
|
let iter = group.stream().into_iter().flat_map(|token| map_ident(field_by_name, token));
|
|
let stream = TokenStream::from_iter(iter);
|
|
return TokenStream::from(TokenTree::Group(Group::new(group.delimiter(), stream)));
|
|
}
|
|
_ => {}
|
|
}
|
|
token.into()
|
|
}
|
|
let token_iter = src_stream.into_iter().flat_map(|token| map_ident(field_by_name, token));
|
|
Ok(TokenStream::from_iter(token_iter))
|
|
}
|
|
|
|
fn express_suffix(
|
|
modifier_by_name: &HashMap<String, &Modifier>,
|
|
field_by_name: &HashMap<String, &Field>,
|
|
modifiers: &[String],
|
|
) -> Result<TokenStream> {
|
|
Ok(if modifiers.is_empty() {
|
|
quote!(String::new())
|
|
} else {
|
|
let mut chars = Vec::new();
|
|
for mod_name in modifiers {
|
|
let modifier: &Modifier = modifier_by_name
|
|
.get(mod_name)
|
|
.ok_or_else(|| Error::from(format!("undefined modifier {}", mod_name)))?;
|
|
let lit_char = LitChar::new(modifier.suffix, Span::call_site());
|
|
let modifier_bit = modifier.express_value_self(field_by_name)?;
|
|
chars.push(quote! {
|
|
if #modifier_bit {
|
|
s.push(#lit_char);
|
|
}
|
|
});
|
|
}
|
|
let chars = token_stream!(chars);
|
|
quote!({
|
|
{
|
|
let mut s = String::with_capacity(4);
|
|
#chars
|
|
s
|
|
}
|
|
})
|
|
})
|
|
}
|