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feat: support negative const generic parameters

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* feat: support `bool` & `char` const generics
This commit is contained in:
Artur Sinila 2022-07-17 04:18:53 +03:00
parent b9b42e8670
commit a96f0aa7cd
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GPG key ID: 770E69D690735C61
15 changed files with 153 additions and 126 deletions
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2
crates/hir-def/src/body.rs
View file

@ -238,7 +238,7 @@ pub struct Mark {
}
/// The body of an item (function, const etc.).
#[derive(Debug, Eq, PartialEq)]
#[derive(Debug, Default, Eq, PartialEq)]
pub struct Body {
pub exprs: Arena<Expr>,
pub pats: Arena<Pat>,

45
crates/hir-def/src/body/lower.rs
View file

@ -1,7 +1,7 @@
//! Transforms `ast::Expr` into an equivalent `hir_def::expr::Expr`
//! representation.
use std::{mem, sync::Arc};
use std::{collections::HashMap, mem, sync::Arc};
use either::Either;
use hir_expand::{
@ -10,8 +10,6 @@ use hir_expand::{
name::{name, AsName, Name},
ExpandError, HirFileId, InFile,
};
use la_arena::Arena;
use profile::Count;
use rustc_hash::FxHashMap;
use syntax::{
ast::{
@ -28,8 +26,8 @@ use crate::{
builtin_type::{BuiltinFloat, BuiltinInt, BuiltinUint},
db::DefDatabase,
expr::{
dummy_expr_id, Array, BindingAnnotation, Expr, ExprId, FloatTypeWrapper, Label, LabelId,
Literal, MatchArm, Pat, PatId, RecordFieldPat, RecordLitField, Statement,
Array, BindingAnnotation, Expr, ExprId, FloatTypeWrapper, Label, LabelId, Literal,
MatchArm, Pat, PatId, RecordFieldPat, RecordLitField, Statement,
},
intern::Interned,
item_scope::BuiltinShadowMode,
@ -82,24 +80,8 @@ pub(super) fn lower(
params: Option<ast::ParamList>,
body: Option<ast::Expr>,
) -> (Body, BodySourceMap) {
ExprCollector {
db,
source_map: BodySourceMap::default(),
body: Body {
exprs: Arena::default(),
pats: Arena::default(),
labels: Arena::default(),
params: Vec::new(),
body_expr: dummy_expr_id(),
block_scopes: Vec::new(),
_c: Count::new(),
or_pats: Default::default(),
},
expander,
name_to_pat_grouping: Default::default(),
is_lowering_inside_or_pat: false,
}
.collect(params, body)
let collector = ExprCollector::new(db, expander);
collector.collect(params, body)
}
struct ExprCollector<'a> {
@ -112,7 +94,18 @@ struct ExprCollector<'a> {
is_lowering_inside_or_pat: bool,
}
impl ExprCollector<'_> {
impl<'a> ExprCollector<'a> {
pub(crate) fn new(db: &'a dyn DefDatabase, expander: Expander) -> Self {
Self {
db,
expander,
body: Body::default(),
source_map: BodySourceMap::default(),
name_to_pat_grouping: HashMap::default(),
is_lowering_inside_or_pat: false,
}
}
fn collect(
mut self,
param_list: Option<ast::ParamList>,
@ -197,7 +190,8 @@ impl ExprCollector<'_> {
}
fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
self.maybe_collect_expr(expr).unwrap_or_else(|| self.missing_expr())
let expr_id = self.maybe_collect_expr(expr).unwrap_or_else(|| self.missing_expr());
expr_id
}
/// Returns `None` if and only if the expression is `#[cfg]`d out.
@ -689,7 +683,6 @@ impl ExprCollector<'_> {
};
let prev_def_map = mem::replace(&mut self.expander.def_map, def_map);
let prev_local_module = mem::replace(&mut self.expander.module, module);
let mut statements: Vec<_> =
block.statements().filter_map(|s| self.collect_stmt(s)).collect();
let tail = block.tail_expr().and_then(|e| self.maybe_collect_expr(e));

5
crates/hir-def/src/expr.rs
View file

@ -13,7 +13,7 @@
//! See also a neighboring `body` module.
use hir_expand::name::Name;
use la_arena::{Idx, RawIdx};
use la_arena::Idx;
use crate::{
builtin_type::{BuiltinFloat, BuiltinInt, BuiltinUint},
@ -26,9 +26,6 @@ use crate::{
pub use syntax::ast::{ArithOp, BinaryOp, CmpOp, LogicOp, Ordering, RangeOp, UnaryOp};
pub type ExprId = Idx<Expr>;
pub(crate) fn dummy_expr_id() -> ExprId {
ExprId::from_raw(RawIdx::from(!0))
}
pub type PatId = Idx<Pat>;

10
crates/hir-def/src/path/lower.rs
View file

@ -1,6 +1,9 @@
//! Transforms syntax into `Path` objects, ideally with accounting for hygiene
use crate::{intern::Interned, type_ref::ConstScalarOrPath};
use crate::{
intern::Interned,
type_ref::{ConstScalar, ConstScalarOrPath},
};
use either::Either;
use hir_expand::name::{name, AsName};
@ -181,7 +184,10 @@ pub(super) fn lower_generic_args(
}
}
ast::GenericArg::ConstArg(arg) => {
let arg = ConstScalarOrPath::from_expr_opt(arg.expr());
let arg = arg.expr().map_or(
ConstScalarOrPath::Scalar(ConstScalar::Unknown),
ConstScalarOrPath::from_expr,
);
args.push(GenericArg::Const(arg))
}
}

103
crates/hir-def/src/type_ref.rs
View file

@ -5,10 +5,15 @@ use hir_expand::{
name::{AsName, Name},
AstId, InFile,
};
use std::{convert::TryInto, fmt::Write};
use syntax::ast::{self, HasName};
use crate::{body::LowerCtx, intern::Interned, path::Path};
use crate::{
body::LowerCtx,
builtin_type::{BuiltinInt, BuiltinType, BuiltinUint},
expr::Literal,
intern::Interned,
path::Path,
};
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub enum Mutability {
@ -177,7 +182,10 @@ impl TypeRef {
// `hir_def::body::lower` to lower this into an `Expr` and then evaluate it at the
// `hir_ty` level, which would allow knowing the type of:
// let v: [u8; 2 + 2] = [0u8; 4];
let len = ConstScalarOrPath::from_expr_opt(inner.expr());
let len = inner.expr().map_or(
ConstScalarOrPath::Scalar(ConstScalar::Unknown),
ConstScalarOrPath::from_expr,
);
TypeRef::Array(Box::new(TypeRef::from_ast_opt(ctx, inner.ty())), len)
}
@ -386,16 +394,9 @@ impl std::fmt::Display for ConstScalarOrPath {
}
impl ConstScalarOrPath {
pub(crate) fn from_expr_opt(expr: Option<ast::Expr>) -> Self {
match expr {
Some(x) => Self::from_expr(x),
None => Self::Scalar(ConstScalar::Unknown),
}
}
// FIXME: as per the comments on `TypeRef::Array`, this evaluation should not happen at this
// parse stage.
fn from_expr(expr: ast::Expr) -> Self {
pub(crate) fn from_expr(expr: ast::Expr) -> Self {
match expr {
ast::Expr::PathExpr(p) => {
match p.path().and_then(|x| x.segment()).and_then(|x| x.name_ref()) {
@ -403,22 +404,31 @@ impl ConstScalarOrPath {
None => Self::Scalar(ConstScalar::Unknown),
}
}
ast::Expr::Literal(lit) => {
let lkind = lit.kind();
match lkind {
ast::LiteralKind::IntNumber(num)
if num.suffix() == None || num.suffix() == Some("usize") =>
{
Self::Scalar(
num.value()
.and_then(|v| v.try_into().ok())
.map(ConstScalar::Usize)
.unwrap_or(ConstScalar::Unknown),
)
ast::Expr::PrefixExpr(prefix_expr) => match prefix_expr.op_kind() {
Some(ast::UnaryOp::Neg) => {
let unsigned = prefix_expr
.expr()
.map_or(Self::Scalar(ConstScalar::Unknown), Self::from_expr);
// Add sign
match unsigned {
Self::Scalar(ConstScalar::UInt(num)) => {
Self::Scalar(ConstScalar::Int(-(num as i128)))
}
other => other,
}
_ => Self::Scalar(ConstScalar::Unknown),
}
}
_ => prefix_expr.expr().map_or(Self::Scalar(ConstScalar::Unknown), Self::from_expr),
},
ast::Expr::Literal(literal) => Self::Scalar(match literal.kind() {
ast::LiteralKind::IntNumber(num) => {
num.value().map(ConstScalar::UInt).unwrap_or(ConstScalar::Unknown)
}
ast::LiteralKind::Char(c) => {
c.value().map(ConstScalar::Char).unwrap_or(ConstScalar::Unknown)
}
ast::LiteralKind::Bool(f) => ConstScalar::Bool(f),
_ => ConstScalar::Unknown,
}),
_ => Self::Scalar(ConstScalar::Unknown),
}
}
@ -427,9 +437,10 @@ impl ConstScalarOrPath {
/// A concrete constant value
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ConstScalar {
// for now, we only support the trivial case of constant evaluating the length of an array
// Note that this is u64 because the target usize may be bigger than our usize
Usize(u64),
Int(i128),
UInt(u128),
Bool(bool),
Char(char),
/// Case of an unknown value that rustc might know but we don't
// FIXME: this is a hack to get around chalk not being able to represent unevaluatable
@ -439,21 +450,37 @@ pub enum ConstScalar {
Unknown,
}
impl std::fmt::Display for ConstScalar {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
impl ConstScalar {
pub fn builtin_type(&self) -> BuiltinType {
match self {
ConstScalar::Usize(us) => us.fmt(f),
ConstScalar::Unknown => f.write_char('_'),
ConstScalar::UInt(_) | ConstScalar::Unknown => BuiltinType::Uint(BuiltinUint::U128),
ConstScalar::Int(_) => BuiltinType::Int(BuiltinInt::I128),
ConstScalar::Char(_) => BuiltinType::Char,
ConstScalar::Bool(_) => BuiltinType::Bool,
}
}
}
impl ConstScalar {
/// Gets a target usize out of the ConstScalar
pub fn as_usize(&self) -> Option<u64> {
match self {
&ConstScalar::Usize(us) => Some(us),
_ => None,
impl From<Literal> for ConstScalar {
fn from(literal: Literal) -> Self {
match literal {
Literal::Char(c) => Self::Char(c),
Literal::Bool(flag) => Self::Bool(flag),
Literal::Int(num, _) => Self::Int(num),
Literal::Uint(num, _) => Self::UInt(num),
_ => Self::Unknown,
}
}
}
impl std::fmt::Display for ConstScalar {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
match self {
ConstScalar::Int(num) => num.fmt(f),
ConstScalar::UInt(num) => num.fmt(f),
ConstScalar::Bool(flag) => flag.fmt(f),
ConstScalar::Char(c) => write!(f, "'{c}'"),
ConstScalar::Unknown => f.write_str("{unknown}"),
}
}
}