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use crate::ir::{
function::parser::ParserContext,
module::name,
types::{self, Type, Types, I1, I32, I64, I8},
util::{spaces, string_literal},
value::{
ConstantArray, ConstantData, ConstantExpr, ConstantInt, ConstantStruct, Value, ValueId,
},
};
use nom::{
branch::alt,
bytes::complete::tag,
character::complete::{char, digit1},
combinator::{opt, recognize},
error::VerboseError,
sequence::{preceded, tuple},
IResult,
};
pub fn parse_constant<'a>(
source: &'a str,
types: &Types,
ty: Type,
) -> IResult<&'a str, ConstantData, VerboseError<&'a str>> {
if let Ok((source, _)) = preceded(spaces, tag("undef"))(source) {
return Ok((source, ConstantData::Undef));
}
if let Ok((source, _)) = preceded(spaces, tag("null"))(source) {
return Ok((source, ConstantData::Null));
}
if let Ok((source, _)) = preceded(spaces, tag("zeroinitializer"))(source) {
return Ok((source, ConstantData::AggregateZero));
}
if let Ok((source, id)) = parse_constant_int(source, ty) {
return Ok((source, id.into()));
}
if let Ok((source, id)) = parse_constant_array(source, types) {
return Ok((source, id));
}
if let Ok((source, id)) = parse_constant_global_ref(source) {
return Ok((source, id));
}
if let Ok((source, id)) = parse_constant_struct(source, types) {
return Ok((source, id));
}
parse_constant_expr(source, types)
}
pub fn parse_constant_int<'a>(
source: &'a str,
ty: Type,
) -> IResult<&'a str, ConstantInt, VerboseError<&'a str>> {
let (source, num) = preceded(
spaces,
recognize(tuple((
opt(char('-')),
alt((digit1, tag("true"), tag("false"))),
))),
)(source)?;
let val = match ty {
I1 => ConstantInt::Int1(num == "true"),
I8 => ConstantInt::Int8(num.parse::<i8>().unwrap()),
I32 => ConstantInt::Int32(num.parse::<i32>().unwrap()),
I64 => ConstantInt::Int64(num.parse::<i64>().unwrap()),
_ => todo!(),
};
Ok((source, val))
}
pub fn parse_constant_array<'a>(
source: &'a str,
_types: &Types,
) -> IResult<&'a str, ConstantData, VerboseError<&'a str>> {
let (source, _) = preceded(spaces, char('c'))(source)?;
let (source, s) = preceded(spaces, string_literal)(source)?;
let val = ConstantData::Array(ConstantArray {
elem_ty: I8,
elems: s
.as_bytes()
.iter()
.map(|c| ConstantData::Int(ConstantInt::Int8(*c as i8)))
.collect(),
is_string: true,
});
Ok((source, val))
}
pub fn parse_constant_expr<'a>(
source: &'a str,
types: &Types,
) -> IResult<&'a str, ConstantData, VerboseError<&'a str>> {
if let Ok((source, konst)) = parse_constant_getelementptr(source, types) {
return Ok((source, konst));
}
parse_constant_bitcast(source, types)
}
pub fn parse_constant_getelementptr<'a>(
source: &'a str,
types: &Types,
) -> IResult<&'a str, ConstantData, VerboseError<&'a str>> {
let (source, _) = preceded(spaces, tag("getelementptr"))(source)?;
let (source, inbounds) = opt(preceded(spaces, tag("inbounds")))(source)?;
let (source, _) = preceded(spaces, char('('))(source)?;
let (source, ty) = types::parse(source, types)?;
let (mut source, _) = preceded(spaces, char(','))(source)?;
let mut args = vec![];
let mut tys = vec![ty];
loop {
let (source_, ty) = types::parse(source, types)?;
let (source_, arg) = parse_constant(source_, types, ty)?;
tys.push(ty);
args.push(arg);
if let Ok((source_, _)) = preceded(spaces, char(','))(source_) {
source = source_;
continue;
}
if let Ok((source, _)) = preceded(spaces, char(')'))(source_) {
return Ok((
source,
ConstantData::Expr(ConstantExpr::GetElementPtr {
inbounds: inbounds.is_some(),
tys,
args,
}),
));
}
}
}
pub fn parse_constant_bitcast<'a>(
source: &'a str,
types: &Types,
) -> IResult<&'a str, ConstantData, VerboseError<&'a str>> {
let (source, _) = preceded(spaces, tag("bitcast"))(source)?;
let (source, _) = preceded(spaces, char('('))(source)?;
let (source, from) = types::parse(source, types)?;
let (source, arg) = parse_constant(source, types, from)?;
let (source, _) = preceded(spaces, tag("to"))(source)?;
let (source, to) = types::parse(source, types)?;
let (source, _) = preceded(spaces, char(')'))(source)?;
Ok((
source,
ConstantData::Expr(ConstantExpr::Bitcast {
tys: [from, to],
arg: Box::new(arg),
}),
))
}
pub fn parse_constant_global_ref(source: &str) -> IResult<&str, ConstantData, VerboseError<&str>> {
let (source, name) = preceded(spaces, preceded(char('@'), name::parse))(source)?;
Ok((source, ConstantData::GlobalRef(name)))
}
pub fn parse_constant_struct<'a>(
source: &'a str,
types: &Types,
) -> IResult<&'a str, ConstantData, VerboseError<&'a str>> {
let (mut source, is_packed) = preceded(spaces, alt((tag("{"), tag("<{"))))(source)?;
let is_packed = is_packed == "<{";
let mut elems = vec![];
let mut elems_ty = vec![];
loop {
let (source_, t) = types::parse(source, types)?;
let (source_, konst) = parse_constant(source_, types, t)?;
elems.push(konst);
elems_ty.push(t);
if let Ok((source_, _)) = preceded(spaces, char(','))(source_) {
source = source_;
continue;
}
let (source_, _) = preceded(spaces, tag(if is_packed { "}>" } else { "}" }))(source_)?;
return Ok((
source_,
ConstantData::Struct(ConstantStruct {
elems_ty,
elems,
is_packed,
}),
));
}
}
pub fn parse_local<'a, 'b>(
source: &'a str,
ctx: &mut ParserContext<'b>,
_ty: Type,
) -> IResult<&'a str, ValueId, VerboseError<&'a str>> {
let (source, name) = preceded(spaces, preceded(char('%'), name::parse))(source)?;
Ok((source, ctx.get_or_create_named_value(name)))
}
pub fn parse<'a, 'b>(
source: &'a str,
ctx: &mut ParserContext<'b>,
ty: Type,
) -> IResult<&'a str, ValueId, VerboseError<&'a str>> {
if let Ok((source, konst)) = parse_constant(source, ctx.types, ty) {
let id = ctx.data.create_value(Value::Constant(konst));
return Ok((source, id));
}
parse_local(source, ctx, ty)
}
