203 lines
6.8 KiB
Rust
203 lines
6.8 KiB
Rust
use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
|
|
use std::iter::FromIterator;
|
|
use syn::parse::{Parse, ParseStream};
|
|
use syn::punctuated::Punctuated;
|
|
use syn::token::{And, EqEq};
|
|
use syn::{LitInt, LitStr, Token};
|
|
|
|
struct Opcodes {
|
|
opcodes: Punctuated<Opcode, Token![;]>,
|
|
}
|
|
|
|
impl Parse for Opcodes {
|
|
fn parse(input: ParseStream) -> syn::Result<Self> {
|
|
Ok(Self {
|
|
opcodes: Punctuated::parse_terminated(input)?,
|
|
})
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct Opcode {
|
|
name: String,
|
|
variant_name: String,
|
|
mask: u32,
|
|
bits: u32,
|
|
}
|
|
|
|
impl Parse for Opcode {
|
|
fn parse(input: ParseStream) -> syn::Result<Self> {
|
|
let name = input.parse::<LitStr>()?;
|
|
input.parse::<And>()?;
|
|
let mask = input.parse::<LitInt>()?;
|
|
input.parse::<EqEq>()?;
|
|
let bits = input.parse::<LitInt>()?;
|
|
Ok(Self {
|
|
name: name.value(),
|
|
variant_name: opcode_to_variant_name(&name)?,
|
|
mask: hex_from_lit_int(&mask)?,
|
|
bits: hex_from_lit_int(&bits)?,
|
|
})
|
|
}
|
|
}
|
|
|
|
fn hex_from_lit_int(int: &LitInt) -> syn::Result<u32> {
|
|
let str = int.to_string();
|
|
let hex = match str.strip_prefix("0x") {
|
|
None => return Err(syn::Error::new(int.span(), "not a hex integer")),
|
|
Some(x) => x,
|
|
};
|
|
u32::from_str_radix(hex, 16).map_err(|e| syn::Error::new(int.span(), e))
|
|
}
|
|
|
|
fn opcode_to_variant_name(opcode: &LitStr) -> syn::Result<String> {
|
|
let mut s = String::new();
|
|
let opcode_value = opcode.value();
|
|
let mut chars = opcode_value.chars();
|
|
loop {
|
|
// Make first char uppercase.
|
|
let c = match chars.next() {
|
|
None => return Ok(s),
|
|
Some(c) => c,
|
|
};
|
|
match c {
|
|
'a'..='z' => s.push(c.to_ascii_uppercase()),
|
|
_ => return Err(syn::Error::new(opcode.span(), "invalid opcode name")),
|
|
}
|
|
loop {
|
|
let c = match chars.next() {
|
|
None => return Ok(s),
|
|
Some(c) => c,
|
|
};
|
|
match c {
|
|
'0'..='9' | 'a'..='z' => s.push(c),
|
|
'_' => break,
|
|
'.' => {
|
|
s.push('_');
|
|
break;
|
|
}
|
|
_ => {
|
|
return Err(syn::Error::new(
|
|
opcode.span(),
|
|
"invalid character in opcode name",
|
|
))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn gen_is_valid_fn(tokens: &mut Vec<TokenTree>, opcodes: &Opcodes) {
|
|
let header: TokenStream = "pub fn is_valid(self, code: u32) -> bool".parse().unwrap();
|
|
tokens.append(&mut header.into_iter().collect());
|
|
let mut parts = Vec::<TokenTree>::new();
|
|
let match_header: TokenStream = "match self".parse().unwrap();
|
|
parts.append(&mut match_header.into_iter().collect());
|
|
let mut match_parts = Vec::<TokenTree>::new();
|
|
let illegal_match: TokenStream = "Opcode::Illegal => false,".parse().unwrap();
|
|
match_parts.append(&mut illegal_match.into_iter().collect());
|
|
for opcode in &opcodes.opcodes {
|
|
match_parts.push(TokenTree::Ident(Ident::new("Opcode", Span::call_site())));
|
|
match_parts.push(TokenTree::Punct(Punct::new(':', Spacing::Joint)));
|
|
match_parts.push(TokenTree::Punct(Punct::new(':', Spacing::Alone)));
|
|
match_parts.push(TokenTree::Ident(Ident::new(
|
|
&opcode.variant_name,
|
|
Span::call_site(),
|
|
)));
|
|
match_parts.push(TokenTree::Punct(Punct::new('=', Spacing::Joint)));
|
|
match_parts.push(TokenTree::Punct(Punct::new('>', Spacing::Alone)));
|
|
match_parts.push(TokenTree::Ident(Ident::new("code", Span::call_site())));
|
|
match_parts.push(TokenTree::Punct(Punct::new('&', Spacing::Alone)));
|
|
match_parts.push(TokenTree::Literal(Literal::u32_suffixed(opcode.mask)));
|
|
match_parts.push(TokenTree::Punct(Punct::new('=', Spacing::Joint)));
|
|
match_parts.push(TokenTree::Punct(Punct::new('=', Spacing::Alone)));
|
|
match_parts.push(TokenTree::Literal(Literal::u32_suffixed(opcode.bits)));
|
|
match_parts.push(TokenTree::Punct(Punct::new(',', Spacing::Alone)));
|
|
}
|
|
let match_body = Group::new(Delimiter::Brace, TokenStream::from_iter(match_parts));
|
|
parts.push(TokenTree::Group(match_body));
|
|
let body = Group::new(Delimiter::Brace, TokenStream::from_iter(parts));
|
|
tokens.push(TokenTree::Group(body));
|
|
}
|
|
|
|
#[proc_macro]
|
|
pub fn isa(input: TokenStream) -> TokenStream {
|
|
let opcodes = syn::parse_macro_input!(input as Opcodes);
|
|
|
|
// Assemble root stream.
|
|
let mut root = Vec::<TokenTree>::new();
|
|
|
|
// Define enum derives and header.
|
|
let derives: TokenStream = "#[derive(Debug, Copy, Clone, Eq, PartialEq)]"
|
|
.parse()
|
|
.unwrap();
|
|
root.append(&mut derives.into_iter().collect());
|
|
let enum_header: TokenStream = "pub enum Opcode".parse().unwrap();
|
|
root.append(&mut enum_header.into_iter().collect());
|
|
|
|
// Create entries.
|
|
// First entry is going to be the illegal entry.
|
|
let mut enum_entries = Vec::<TokenTree>::new();
|
|
enum_entries.append(
|
|
&mut "Illegal = -1,"
|
|
.parse::<TokenStream>()
|
|
.unwrap()
|
|
.into_iter()
|
|
.collect(),
|
|
);
|
|
// Append the actual opcodes.
|
|
for opcode in &opcodes.opcodes {
|
|
enum_entries.push(TokenTree::Ident(Ident::new(
|
|
&opcode.variant_name,
|
|
Span::call_site(),
|
|
)));
|
|
enum_entries.push(TokenTree::Punct(Punct::new(',', Spacing::Alone)));
|
|
}
|
|
|
|
// Create body.
|
|
let enum_body = Group::new(Delimiter::Brace, TokenStream::from_iter(enum_entries));
|
|
root.push(TokenTree::Group(enum_body));
|
|
|
|
// Default implementation.
|
|
let opcode_default = "
|
|
impl Default for Opcode {
|
|
fn default() -> Self {
|
|
Opcode::Illegal
|
|
}
|
|
}";
|
|
root.append(
|
|
&mut opcode_default
|
|
.parse::<TokenStream>()
|
|
.unwrap()
|
|
.into_iter()
|
|
.collect(),
|
|
);
|
|
|
|
// impl Opcode block.
|
|
let impl_opcode_header: TokenStream = "impl Opcode".parse().unwrap();
|
|
root.append(&mut impl_opcode_header.into_iter().collect());
|
|
let mut impl_opcode_body_parts = Vec::<TokenTree>::new();
|
|
gen_is_valid_fn(&mut impl_opcode_body_parts, &opcodes);
|
|
let impl_opcode_body = Group::new(
|
|
Delimiter::Brace,
|
|
TokenStream::from_iter(impl_opcode_body_parts),
|
|
);
|
|
root.push(TokenTree::Group(impl_opcode_body));
|
|
TokenStream::from_iter(root)
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
fn _opcode_to_variant_name(input: &str) -> String {
|
|
opcode_to_variant_name(&LitStr::new(input, proc_macro2::Span::call_site())).unwrap()
|
|
}
|
|
|
|
#[test]
|
|
fn test_opcode_to_variant_name() {
|
|
assert_eq!(_opcode_to_variant_name("lol_lel."), "LolLel_");
|
|
assert_eq!(_opcode_to_variant_name("ps_nmsub"), "PsNmsub");
|
|
}
|
|
}
|