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/// Dead-code detector (M18).
///
/// After body analysis has recorded all method/property/function references into the
/// codebase, this analyzer walks every class and reports:
///
/// - `UnusedMethod` — private method that is never called
/// - `UnusedProperty` — private property that is never read
/// - `UnusedFunction` — non-public free function that is never called
///
/// Magic methods (`__construct`, `__destruct`, `__toString`, etc.) and
/// constructors are excluded because they are called implicitly.
use std::sync::Arc;
use mir_codebase::storage::Visibility;
use mir_issues::{Issue, IssueKind, Location, Severity};
use crate::db::MirDatabase;
use crate::stubs::StubVfs;
// Magic PHP methods that are invoked implicitly — never flag these as unused.
const MAGIC_METHODS: &[&str] = &[
"__construct",
"__destruct",
"__call",
"__callstatic",
"__get",
"__set",
"__isset",
"__unset",
"__sleep",
"__wakeup",
"__serialize",
"__unserialize",
"__tostring",
"__invoke",
"__set_state",
"__clone",
"__debuginfo",
];
pub struct DeadCodeAnalyzer<'a> {
db: &'a dyn MirDatabase,
}
impl<'a> DeadCodeAnalyzer<'a> {
pub fn new(db: &'a dyn MirDatabase) -> Self {
Self { db }
}
pub fn analyze(&self) -> Vec<Issue> {
let mut issues = Vec::new();
// Walk only plain classes (not interfaces/traits/enums); private
// members on the other kinds aren't subject to dead-code reporting.
let class_fqcns: Vec<Arc<str>> = crate::db::workspace_classes(self.db)
.iter()
.cloned()
.collect();
for fqcn in &class_fqcns {
let here = crate::db::Fqcn::from_str(self.db, fqcn.as_ref());
let pulled = crate::db::find_class_like(self.db, here);
let is_class = pulled.as_ref().map(|c| c.is_class()).unwrap_or(false);
if !is_class {
continue;
}
let fqcn_str = fqcn.as_ref();
// Methods.
if let Some(class) = pulled.as_ref() {
for (name, method) in class.own_methods().iter() {
if method.visibility != Visibility::Private {
continue;
}
let name_lower = name.to_ascii_lowercase();
if MAGIC_METHODS.contains(&name_lower.as_str()) {
continue;
}
if !self.db.has_reference(&format!(
"{}::{}",
fqcn_str,
name.to_ascii_lowercase()
)) {
let location = location_from_storage(&method.location);
issues.push(Issue::new(
IssueKind::UnusedMethod {
class: fqcn_str.to_string(),
method: name.to_string(),
},
location,
));
}
}
}
// Properties.
if let Some(class) = pulled.as_ref() {
if let Some(props) = class.own_properties() {
for (name, prop) in props.iter() {
if prop.visibility != Visibility::Private {
continue;
}
if !self
.db
.has_reference(&format!("{}::{}", fqcn_str, name.as_ref()))
{
let location = location_from_storage(&prop.location);
issues.push(Issue::new(
IssueKind::UnusedProperty {
class: fqcn_str.to_string(),
property: name.to_string(),
},
location,
));
}
}
}
}
}
// --- Non-referenced free functions ---
let stub_vfs = StubVfs::new();
let fqns: Vec<Arc<str>> = crate::db::workspace_functions(self.db)
.iter()
.cloned()
.collect();
for fqn in fqns {
let here = crate::db::Fqcn::from_str(self.db, fqn.as_ref());
let pulled = crate::db::find_function(self.db, here);
let Some(f) = pulled.as_ref() else {
continue;
};
let (location, short_name) = (f.location.clone(), f.short_name.to_string());
// Skip PHP built-in and extension functions loaded from stubs —
// they are not user-defined dead code.
if let Some(loc) = &location {
if stub_vfs.is_stub_file(loc.file.as_ref()) {
continue;
}
}
if !self.db.has_reference(fqn.as_ref()) {
let location = location_from_storage(&location);
issues.push(Issue::new(
IssueKind::UnusedFunction { name: short_name },
location,
));
}
}
// Downgrade all dead-code issues to Info
for issue in &mut issues {
issue.severity = Severity::Info;
}
issues
}
}
fn location_from_storage(loc: &Option<mir_types::Location>) -> Location {
match loc {
Some(l) => Location {
file: l.file.clone(),
line: l.line,
line_end: l.line_end,
col_start: l.col_start,
col_end: l.col_end,
},
None => Location {
file: std::sync::Arc::from("<unknown>"),
line: 1,
line_end: 1,
col_start: 0,
col_end: 0,
},
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::session::AnalysisSession;
use crate::PhpVersion;
#[test]
fn builtin_functions_not_flagged_as_unused() {
// The dead-code pass must not produce UnusedFunction for PHP built-ins
// (strlen, array_map, etc.) even when they are never called in user code.
// This test bypasses the fixture runner's file-path filter to verify the
// fix directly on the DeadCodeAnalyzer output.
let session = AnalysisSession::new(PhpVersion::LATEST);
session.ensure_all_stubs();
let db = session.snapshot_db();
let issues = DeadCodeAnalyzer::new(&db).analyze();
let builtin_false_positives: Vec<_> = issues
.iter()
.filter(|i| {
matches!(&i.kind, IssueKind::UnusedFunction { name } if
matches!(name.as_str(), "strlen" | "array_map" | "json_encode" | "preg_match")
)
})
.collect();
assert!(
builtin_false_positives.is_empty(),
"Expected no UnusedFunction for PHP builtins, got: {:?}",
builtin_false_positives
.iter()
.map(|i| i.kind.message())
.collect::<Vec<_>>()
);
}
}