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use fnv::FnvHashSet;
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
//
// Copyright (c) 2023, Olof Kraigher olof.kraigher@gmail.com
use super::analyze::*;
use super::scope::*;
use crate::analysis::static_expression::{bit_string_to_string, BitStringConversionError};
use crate::ast::*;
use crate::data::error_codes::ErrorCode;
use crate::data::*;
use crate::named_entity::*;
use crate::TokenSpan;
impl<'a> AnalyzeContext<'a, '_> {
/// Analyze a string literal or expanded bit-string literal for type-matching
fn analyze_string_literal(
&self,
span: TokenSpan,
string_lit: Latin1String,
target_base: TypeEnt<'_>,
target_type: TypeEnt<'_>,
diagnostics: &mut dyn DiagnosticHandler,
) {
if let Some((elem_type, literals)) = as_single_index_enum_array(target_base) {
for chr in string_lit.chars() {
let chr = Designator::Character(*chr);
if !literals.contains(&chr) {
diagnostics.add(
span.pos(self.ctx),
format!("{} does not define character {}", elem_type.describe(), chr),
ErrorCode::InvalidLiteral,
);
break;
}
}
} else {
diagnostics.add(
span.pos(self.ctx),
format!("string literal does not match {}", target_type.describe()),
ErrorCode::TypeMismatch,
);
}
}
/// Returns true if the name actually matches the target type
/// None if it was uncertain
pub fn analyze_literal_with_target_type(
&self,
scope: &Scope<'a>,
target_type: TypeEnt<'a>,
span: TokenSpan,
literal: &mut Literal,
diagnostics: &mut dyn DiagnosticHandler,
) -> FatalResult {
let target_base = target_type.base_type();
match literal {
Literal::AbstractLiteral(abst) => match abst {
AbstractLiteral::Integer(_) => {
if !self.can_be_target_type(self.universal_integer().into(), target_type.base())
{
diagnostics.add(
span.pos(self.ctx),
format!("integer literal does not match {}", target_type.describe()),
ErrorCode::TypeMismatch,
);
}
}
AbstractLiteral::Real(_) => {
if !self.can_be_target_type(self.universal_real().into(), target_type.base()) {
diagnostics.add(
span.pos(self.ctx),
format!("real literal does not match {}", target_type.describe()),
ErrorCode::TypeMismatch,
);
}
}
},
Literal::Character(char) => match target_base.kind() {
Type::Enum(literals) => {
if !literals.contains(&Designator::Character(*char)) {
diagnostics.add(
span.pos(self.ctx),
format!(
"character literal does not match {}",
target_type.describe()
),
ErrorCode::TypeMismatch,
);
}
}
_ => {
diagnostics.add(
span.pos(self.ctx),
format!(
"character literal does not match {}",
target_type.describe()
),
ErrorCode::TypeMismatch,
);
}
},
Literal::String(string_lit) => {
self.analyze_string_literal(
span,
string_lit.to_owned(),
target_base,
target_type,
diagnostics,
);
}
Literal::BitString(bit_string) => {
match bit_string_to_string(bit_string) {
Ok(string_lit) => self.analyze_string_literal(
span,
string_lit,
target_base,
target_type,
diagnostics,
),
Err(err) => {
match err {
BitStringConversionError::IllegalDecimalCharacter(rel_pos) => {
diagnostics.add(
span.pos(self.ctx),
format!(
"Illegal digit '{}' for base 10",
bit_string.value.bytes[rel_pos] as char,
),
ErrorCode::InvalidLiteral,
)
}
BitStringConversionError::IllegalTruncate(_, _) => {
diagnostics.add(
span.pos(self.ctx),
format!(
"Truncating vector to length {} would lose information",
bit_string.length.unwrap() // Safe as this error can only happen when there is a length
),
ErrorCode::InvalidLiteral,
);
}
BitStringConversionError::EmptySignedExpansion => {
diagnostics.add(
span.pos(self.ctx),
"Cannot expand an empty signed bit string",
ErrorCode::InvalidLiteral,
);
}
}
}
}
}
Literal::Physical(PhysicalLiteral { ref mut unit, .. }) => {
match self.resolve_physical_unit(scope, unit) {
Ok(physical_type) => {
if physical_type.base_type() != target_base {
diagnostics.push(Diagnostic::type_mismatch(
&span.pos(self.ctx),
&physical_type.describe(),
target_type,
))
}
}
Err(diagnostic) => {
diagnostics.push(diagnostic);
}
}
}
Literal::Null => {
if !matches!(target_base.kind(), Type::Access(_)) {
diagnostics.add(
span.pos(self.ctx),
format!("null literal does not match {}", target_base.describe()),
ErrorCode::TypeMismatch,
);
}
}
};
Ok(())
}
pub fn resolve_physical_unit(
&self,
scope: &Scope<'a>,
unit: &mut WithRef<Ident>,
) -> Result<TypeEnt<'a>, Diagnostic> {
match scope
.lookup(&Designator::Identifier(unit.item.item.clone()))
.map_err(|err| err.into_diagnostic(self.ctx, unit.item.token))?
{
NamedEntities::Single(unit_ent) => {
unit.set_unique_reference(unit_ent);
if let AnyEntKind::PhysicalLiteral(physical_ent) = unit_ent.actual_kind() {
Ok(*physical_ent)
} else {
Err(Diagnostic::new(
unit.item.pos(self.ctx),
format!("{} is not a physical unit", unit_ent.describe()),
ErrorCode::InvalidLiteral,
))
}
}
NamedEntities::Overloaded(_) => Err(Diagnostic::mismatched_kinds(
unit.item.pos(self.ctx),
"Overloaded name may not be physical unit",
)),
}
}
}
/// Must be an array type with a single index of enum type
fn as_single_index_enum_array(typ: TypeEnt<'_>) -> Option<(TypeEnt<'_>, &FnvHashSet<Designator>)> {
if let Type::Array {
indexes, elem_type, ..
} = typ.kind()
{
if indexes.len() == 1 {
if let Type::Enum(literals) = elem_type.base_type().kind() {
return Some((*elem_type, literals));
}
}
}
None
}