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use super::analyze::*;
use super::region::*;
use crate::ast::*;
use crate::data::*;
use std::sync::Arc;
// Represent a resolved name which can be either a
// 1. NonObject such as a library or design unit
// 2. Object such a direct reference to an object or some kind of index, slice or selected name
pub enum ResolvedName {
NonObject(Arc<NamedEntity>),
Overloaded(OverloadedName),
ObjectSelection {
base_object: ObjectEnt,
type_mark: Arc<NamedEntity>,
},
ExternalName {
class: ExternalObjectClass,
type_mark: Arc<NamedEntity>,
},
}
impl ResolvedName {
fn new(ent: Arc<NamedEntity>) -> Self {
match ent.kind() {
NamedEntityKind::Object(object) => {
let type_mark = object.subtype.type_mark().clone();
Self::ObjectSelection {
base_object: ObjectEnt::new(ent),
type_mark,
}
}
NamedEntityKind::ObjectAlias {
base_object,
type_mark,
} => Self::ObjectSelection {
base_object: base_object.clone(),
type_mark: type_mark.clone(),
},
_ => Self::NonObject(ent),
}
}
fn with_suffix(self, ent: Arc<NamedEntity>) -> Self {
match ent.kind() {
NamedEntityKind::Object(..) => {
debug_assert!(matches!(self, Self::NonObject(_)));
Self::new(ent)
}
NamedEntityKind::ObjectAlias { .. } => {
debug_assert!(matches!(self, Self::NonObject(_)));
Self::new(ent)
}
_ => {
match self {
Self::NonObject(_) => Self::NonObject(ent),
Self::ObjectSelection { base_object, .. } => match ent.actual_kind() {
NamedEntityKind::ElementDeclaration(subtype) => Self::ObjectSelection {
base_object,
type_mark: subtype.type_mark().clone(),
},
_ => Self::NonObject(ent),
},
Self::ExternalName { class, .. } => match ent.actual_kind() {
NamedEntityKind::ElementDeclaration(subtype) => Self::ExternalName {
class,
type_mark: subtype.type_mark().clone(),
},
// @TODO this is probably an error
_ => Self::NonObject(ent),
},
Self::Overloaded(..) => {
unreachable!("Overloaded suffix of overloaded name");
}
}
}
}
}
}
impl<'a> AnalyzeContext<'a> {
// Helper function:
// Resolve a name that must be some kind of object selection, index or slice
// Such names occur as assignment targets and aliases
// Takes an error message as an argument to be re-usable
pub fn resolve_object_prefix(
&self,
region: &Region<'_>,
name_pos: &SrcPos,
name: &mut Name,
err_msg: &'static str,
diagnostics: &mut dyn DiagnosticHandler,
) -> AnalysisResult<ResolvedName> {
match name {
Name::Selected(prefix, suffix) => {
suffix.clear_reference();
let resolved = self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
)?;
match resolved {
ResolvedName::NonObject(ref ent) => {
match self.lookup_selected(&prefix.pos, ent, suffix)? {
NamedEntities::Single(named_entity) => {
suffix.set_unique_reference(&named_entity);
Ok(resolved.with_suffix(named_entity))
}
NamedEntities::Overloaded(overloaded) => {
// Could be used for an alias of a subprogram
Ok(ResolvedName::Overloaded(overloaded))
}
}
}
ResolvedName::ObjectSelection { ref type_mark, .. } => {
match self.lookup_type_selected(&prefix.pos, type_mark, suffix)? {
NamedEntities::Single(named_entity) => {
suffix.set_unique_reference(&named_entity);
Ok(resolved.with_suffix(named_entity))
}
NamedEntities::Overloaded(..) => {
// Probably a protected type method, this can never be aliased or a target
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
}
ResolvedName::ExternalName { ref type_mark, .. } => {
match self.lookup_type_selected(&prefix.pos, type_mark, suffix)? {
NamedEntities::Single(named_entity) => {
suffix.set_unique_reference(&named_entity);
Ok(resolved.with_suffix(named_entity))
}
NamedEntities::Overloaded(..) => {
// Probably a protected type method, this can never be aliased or a target
// Likely a user error
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
}
ResolvedName::Overloaded(..) => {
// Overloaded suffix of overloaded name is not possible
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
}
Name::SelectedAll(prefix) => self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
),
Name::Designator(designator) => {
designator.clear_reference();
match region.lookup_within(name_pos, designator.designator())? {
NamedEntities::Single(named_entity) => {
designator.set_unique_reference(&named_entity);
Ok(ResolvedName::new(named_entity))
}
NamedEntities::Overloaded(overloaded) => {
// Could be used for an alias of a subprogram
Ok(ResolvedName::Overloaded(overloaded))
}
}
}
Name::Indexed(ref mut prefix, ref mut indexes) => {
let resolved = self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
);
if let Ok(ResolvedName::ObjectSelection {
base_object,
type_mark,
}) = resolved
{
let elem_type = self.analyze_indexed_name(
region,
name_pos,
prefix.suffix_pos(),
&type_mark,
indexes,
diagnostics,
)?;
Ok(ResolvedName::ObjectSelection {
base_object,
type_mark: elem_type,
})
} else {
for expr in indexes.iter_mut() {
self.analyze_expression(region, expr, diagnostics)?;
}
Err(Diagnostic::error(&prefix.pos, err_msg).into())
}
}
Name::Slice(ref mut prefix, ref mut drange) => {
let res = self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
);
if let Ok(ResolvedName::ObjectSelection { ref type_mark, .. }) = res {
self.analyze_sliced_name(prefix.suffix_pos(), type_mark, diagnostics)?;
}
self.analyze_discrete_range(region, drange.as_mut(), diagnostics)?;
res
}
Name::Attribute(..) => Err(Diagnostic::error(name_pos, err_msg).into()),
Name::FunctionCall(ref mut fcall) => {
if let Some(indexed_name) = fcall.to_indexed() {
*name = indexed_name;
self.resolve_object_prefix(region, name_pos, name, err_msg, diagnostics)
} else {
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
Name::External(ref mut ename) => {
let ExternalName { subtype, class, .. } = ename.as_mut();
let subtype = self.resolve_subtype_indication(region, subtype, diagnostics)?;
Ok(ResolvedName::ExternalName {
class: *class,
type_mark: subtype.type_mark().clone(),
})
}
}
}
}