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Allow static initializers to be const evaluated

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This commit is contained in:
Lukas Wirth 2024-11-02 12:43:11 +01:00
parent d1fbfc676b
commit 94c35f6138
7 changed files with 87 additions and 28 deletions
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41
crates/hir/src/lib.rs
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@ -2600,7 +2600,7 @@ impl Const {
}
}
}
if let Ok(s) = mir::render_const_using_debug_impl(db, self.id, &c) {
if let Ok(s) = mir::render_const_using_debug_impl(db, self.id.into(), &c) {
Ok(s)
} else {
Ok(format!("{}", c.display(db, edition)))
@ -2639,6 +2639,45 @@ impl Static {
pub fn ty(self, db: &dyn HirDatabase) -> Type {
Type::from_value_def(db, self.id)
}
/// Evaluate the constant and return the result as a string, with more detailed information.
///
/// This function is intended for user-facing display.
pub fn render_eval(
self,
db: &dyn HirDatabase,
edition: Edition,
) -> Result<String, ConstEvalError> {
let c = db.const_eval(self.id.into(), Substitution::empty(Interner), None)?;
let data = &c.data(Interner);
if let TyKind::Scalar(s) = data.ty.kind(Interner) {
if matches!(s, Scalar::Int(_) | Scalar::Uint(_)) {
if let hir_ty::ConstValue::Concrete(c) = &data.value {
if let hir_ty::ConstScalar::Bytes(b, _) = &c.interned {
let value = u128::from_le_bytes(mir::pad16(b, false));
let value_signed =
i128::from_le_bytes(mir::pad16(b, matches!(s, Scalar::Int(_))));
let mut result = if let Scalar::Int(_) = s {
value_signed.to_string()
} else {
value.to_string()
};
if value >= 10 {
format_to!(result, " ({value:#X})");
return Ok(result);
} else {
return Ok(result);
}
}
}
}
}
if let Ok(s) = mir::render_const_using_debug_impl(db, self.id.into(), &c) {
Ok(s)
} else {
Ok(format!("{}", c.display(db, edition)))
}
}
}
impl HasVisibility for Static {