1241 lines
46 KiB
Rust
1241 lines
46 KiB
Rust
//! AST walker. Each overridden visit method has full control over what
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//! happens with its node, it can do its own traversal of the node's children,
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//! call `visit::walk_*` to apply the default traversal algorithm, or prevent
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//! deeper traversal by doing nothing.
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//!
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//! Note: it is an important invariant that the default visitor walks the body
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//! of a function in "execution order" (more concretely, reverse post-order
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//! with respect to the CFG implied by the AST), meaning that if AST node A may
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//! execute before AST node B, then A is visited first. The borrow checker in
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//! particular relies on this property.
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//!
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//! Note: walking an AST before macro expansion is probably a bad idea. For
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//! instance, a walker looking for item names in a module will miss all of
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//! those that are created by the expansion of a macro.
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pub use rustc_ast_ir::visit::VisitorResult;
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pub use rustc_ast_ir::{try_visit, visit_opt, walk_list, walk_visitable_list};
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use rustc_span::Span;
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use rustc_span::symbol::Ident;
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use crate::ast::*;
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use crate::ptr::P;
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#[derive(Copy, Clone, Debug, PartialEq)]
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pub enum AssocCtxt {
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Trait,
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Impl,
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}
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#[derive(Copy, Clone, Debug, PartialEq)]
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pub enum FnCtxt {
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Free,
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Foreign,
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Assoc(AssocCtxt),
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}
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#[derive(Copy, Clone, Debug)]
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pub enum BoundKind {
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/// Trait bounds in generics bounds and type/trait alias.
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/// E.g., `<T: Bound>`, `type A: Bound`, or `where T: Bound`.
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Bound,
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/// Trait bounds in `impl` type.
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/// E.g., `type Foo = impl Bound1 + Bound2 + Bound3`.
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Impl,
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/// Trait bounds in trait object type.
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/// E.g., `dyn Bound1 + Bound2 + Bound3`.
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TraitObject,
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/// Super traits of a trait.
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/// E.g., `trait A: B`
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SuperTraits,
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}
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impl BoundKind {
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pub fn descr(self) -> &'static str {
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match self {
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BoundKind::Bound => "bounds",
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BoundKind::Impl => "`impl Trait`",
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BoundKind::TraitObject => "`dyn` trait object bounds",
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BoundKind::SuperTraits => "supertrait bounds",
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}
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}
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}
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#[derive(Copy, Clone, Debug)]
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pub enum FnKind<'a> {
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/// E.g., `fn foo()`, `fn foo(&self)`, or `extern "Abi" fn foo()`.
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Fn(FnCtxt, Ident, &'a FnSig, &'a Visibility, &'a Generics, Option<&'a Block>),
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/// E.g., `|x, y| body`.
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Closure(&'a ClosureBinder, &'a Option<CoroutineKind>, &'a FnDecl, &'a Expr),
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}
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impl<'a> FnKind<'a> {
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pub fn header(&self) -> Option<&'a FnHeader> {
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match *self {
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FnKind::Fn(_, _, sig, _, _, _) => Some(&sig.header),
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FnKind::Closure(..) => None,
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}
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}
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pub fn ident(&self) -> Option<&Ident> {
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match self {
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FnKind::Fn(_, ident, ..) => Some(ident),
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_ => None,
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}
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}
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pub fn decl(&self) -> &'a FnDecl {
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match self {
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FnKind::Fn(_, _, sig, _, _, _) => &sig.decl,
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FnKind::Closure(_, _, decl, _) => decl,
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}
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}
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pub fn ctxt(&self) -> Option<FnCtxt> {
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match self {
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FnKind::Fn(ctxt, ..) => Some(*ctxt),
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FnKind::Closure(..) => None,
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}
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}
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}
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#[derive(Copy, Clone, Debug)]
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pub enum LifetimeCtxt {
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/// Appears in a reference type.
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Ref,
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/// Appears as a bound on a type or another lifetime.
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Bound,
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/// Appears as a generic argument.
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GenericArg,
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}
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pub trait WalkItemKind: Sized {
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fn walk<'a, V: Visitor<'a>>(
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&'a self,
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item: &'a Item<Self>,
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ctxt: AssocCtxt,
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visitor: &mut V,
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) -> V::Result;
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}
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/// Each method of the `Visitor` trait is a hook to be potentially
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/// overridden. Each method's default implementation recursively visits
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/// the substructure of the input via the corresponding `walk` method;
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/// e.g., the `visit_item` method by default calls `visit::walk_item`.
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///
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/// If you want to ensure that your code handles every variant
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/// explicitly, you need to override each method. (And you also need
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/// to monitor future changes to `Visitor` in case a new method with a
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/// new default implementation gets introduced.)
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pub trait Visitor<'ast>: Sized {
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/// The result type of the `visit_*` methods. Can be either `()`,
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/// or `ControlFlow<T>`.
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type Result: VisitorResult = ();
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fn visit_ident(&mut self, _ident: &'ast Ident) -> Self::Result {
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Self::Result::output()
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}
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fn visit_foreign_item(&mut self, i: &'ast ForeignItem) -> Self::Result {
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walk_item(self, i)
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}
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fn visit_item(&mut self, i: &'ast Item) -> Self::Result {
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walk_item(self, i)
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}
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fn visit_local(&mut self, l: &'ast Local) -> Self::Result {
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walk_local(self, l)
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}
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fn visit_block(&mut self, b: &'ast Block) -> Self::Result {
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walk_block(self, b)
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}
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fn visit_stmt(&mut self, s: &'ast Stmt) -> Self::Result {
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walk_stmt(self, s)
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}
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fn visit_param(&mut self, param: &'ast Param) -> Self::Result {
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walk_param(self, param)
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}
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fn visit_arm(&mut self, a: &'ast Arm) -> Self::Result {
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walk_arm(self, a)
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}
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fn visit_pat(&mut self, p: &'ast Pat) -> Self::Result {
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walk_pat(self, p)
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}
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fn visit_anon_const(&mut self, c: &'ast AnonConst) -> Self::Result {
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walk_anon_const(self, c)
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}
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fn visit_expr(&mut self, ex: &'ast Expr) -> Self::Result {
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walk_expr(self, ex)
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}
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/// This method is a hack to workaround unstable of `stmt_expr_attributes`.
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/// It can be removed once that feature is stabilized.
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fn visit_method_receiver_expr(&mut self, ex: &'ast Expr) -> Self::Result {
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self.visit_expr(ex)
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}
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fn visit_ty(&mut self, t: &'ast Ty) -> Self::Result {
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walk_ty(self, t)
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}
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fn visit_generic_param(&mut self, param: &'ast GenericParam) -> Self::Result {
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walk_generic_param(self, param)
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}
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fn visit_generics(&mut self, g: &'ast Generics) -> Self::Result {
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walk_generics(self, g)
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}
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fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) -> Self::Result {
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walk_closure_binder(self, b)
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}
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fn visit_where_predicate(&mut self, p: &'ast WherePredicate) -> Self::Result {
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walk_where_predicate(self, p)
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}
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fn visit_fn(&mut self, fk: FnKind<'ast>, _: Span, _: NodeId) -> Self::Result {
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walk_fn(self, fk)
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}
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fn visit_assoc_item(&mut self, i: &'ast AssocItem, ctxt: AssocCtxt) -> Self::Result {
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walk_assoc_item(self, i, ctxt)
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}
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fn visit_trait_ref(&mut self, t: &'ast TraitRef) -> Self::Result {
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walk_trait_ref(self, t)
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}
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fn visit_param_bound(&mut self, bounds: &'ast GenericBound, _ctxt: BoundKind) -> Self::Result {
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walk_param_bound(self, bounds)
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}
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fn visit_precise_capturing_arg(&mut self, arg: &'ast PreciseCapturingArg) {
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walk_precise_capturing_arg(self, arg);
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}
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fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef) -> Self::Result {
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walk_poly_trait_ref(self, t)
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}
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fn visit_variant_data(&mut self, s: &'ast VariantData) -> Self::Result {
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walk_struct_def(self, s)
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}
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fn visit_field_def(&mut self, s: &'ast FieldDef) -> Self::Result {
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walk_field_def(self, s)
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}
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fn visit_enum_def(&mut self, enum_definition: &'ast EnumDef) -> Self::Result {
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walk_enum_def(self, enum_definition)
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}
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fn visit_variant(&mut self, v: &'ast Variant) -> Self::Result {
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walk_variant(self, v)
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}
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fn visit_variant_discr(&mut self, discr: &'ast AnonConst) -> Self::Result {
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self.visit_anon_const(discr)
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}
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fn visit_label(&mut self, label: &'ast Label) -> Self::Result {
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walk_label(self, label)
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}
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fn visit_lifetime(&mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt) -> Self::Result {
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walk_lifetime(self, lifetime)
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}
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fn visit_mac_call(&mut self, mac: &'ast MacCall) -> Self::Result {
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walk_mac(self, mac)
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}
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fn visit_mac_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) -> Self::Result {
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Self::Result::output()
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}
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fn visit_path(&mut self, path: &'ast Path, _id: NodeId) -> Self::Result {
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walk_path(self, path)
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}
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fn visit_use_tree(
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&mut self,
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use_tree: &'ast UseTree,
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id: NodeId,
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_nested: bool,
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) -> Self::Result {
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walk_use_tree(self, use_tree, id)
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}
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fn visit_path_segment(&mut self, path_segment: &'ast PathSegment) -> Self::Result {
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walk_path_segment(self, path_segment)
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}
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fn visit_generic_args(&mut self, generic_args: &'ast GenericArgs) -> Self::Result {
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walk_generic_args(self, generic_args)
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}
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fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) -> Self::Result {
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walk_generic_arg(self, generic_arg)
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}
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fn visit_assoc_item_constraint(
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&mut self,
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constraint: &'ast AssocItemConstraint,
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) -> Self::Result {
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walk_assoc_item_constraint(self, constraint)
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}
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fn visit_attribute(&mut self, attr: &'ast Attribute) -> Self::Result {
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walk_attribute(self, attr)
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}
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fn visit_vis(&mut self, vis: &'ast Visibility) -> Self::Result {
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walk_vis(self, vis)
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}
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fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) -> Self::Result {
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walk_fn_ret_ty(self, ret_ty)
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}
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fn visit_fn_header(&mut self, _header: &'ast FnHeader) -> Self::Result {
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Self::Result::output()
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}
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fn visit_expr_field(&mut self, f: &'ast ExprField) -> Self::Result {
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walk_expr_field(self, f)
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}
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fn visit_pat_field(&mut self, fp: &'ast PatField) -> Self::Result {
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walk_pat_field(self, fp)
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}
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fn visit_crate(&mut self, krate: &'ast Crate) -> Self::Result {
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walk_crate(self, krate)
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}
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fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) -> Self::Result {
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walk_inline_asm(self, asm)
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}
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fn visit_format_args(&mut self, fmt: &'ast FormatArgs) -> Self::Result {
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walk_format_args(self, fmt)
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}
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fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) -> Self::Result {
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walk_inline_asm_sym(self, sym)
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}
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fn visit_capture_by(&mut self, _capture_by: &'ast CaptureBy) -> Self::Result {
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Self::Result::output()
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}
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}
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pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) -> V::Result {
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let Crate { attrs, items, spans: _, id: _, is_placeholder: _ } = krate;
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walk_list!(visitor, visit_attribute, attrs);
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walk_list!(visitor, visit_item, items);
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V::Result::output()
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}
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pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) -> V::Result {
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let Local { id: _, pat, ty, kind, span: _, colon_sp: _, attrs, tokens: _ } = local;
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walk_list!(visitor, visit_attribute, attrs);
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try_visit!(visitor.visit_pat(pat));
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visit_opt!(visitor, visit_ty, ty);
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if let Some((init, els)) = kind.init_else_opt() {
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try_visit!(visitor.visit_expr(init));
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visit_opt!(visitor, visit_block, els);
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}
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V::Result::output()
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}
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pub fn walk_label<'a, V: Visitor<'a>>(visitor: &mut V, Label { ident }: &'a Label) -> V::Result {
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visitor.visit_ident(ident)
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}
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pub fn walk_lifetime<'a, V: Visitor<'a>>(visitor: &mut V, lifetime: &'a Lifetime) -> V::Result {
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let Lifetime { id: _, ident } = lifetime;
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visitor.visit_ident(ident)
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}
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pub fn walk_poly_trait_ref<'a, V>(visitor: &mut V, trait_ref: &'a PolyTraitRef) -> V::Result
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where
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V: Visitor<'a>,
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{
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let PolyTraitRef { bound_generic_params, modifiers: _, trait_ref, span: _ } = trait_ref;
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walk_list!(visitor, visit_generic_param, bound_generic_params);
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visitor.visit_trait_ref(trait_ref)
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}
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pub fn walk_trait_ref<'a, V: Visitor<'a>>(visitor: &mut V, trait_ref: &'a TraitRef) -> V::Result {
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let TraitRef { path, ref_id } = trait_ref;
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visitor.visit_path(path, *ref_id)
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}
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impl WalkItemKind for ItemKind {
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fn walk<'a, V: Visitor<'a>>(
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&'a self,
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item: &'a Item<Self>,
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_ctxt: AssocCtxt,
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visitor: &mut V,
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) -> V::Result {
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let Item { id, span, vis, ident, .. } = item;
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match self {
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ItemKind::ExternCrate(_rename) => {}
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ItemKind::Use(use_tree) => try_visit!(visitor.visit_use_tree(use_tree, *id, false)),
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ItemKind::Static(box StaticItem { ty, safety: _, mutability: _, expr }) => {
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try_visit!(visitor.visit_ty(ty));
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visit_opt!(visitor, visit_expr, expr);
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}
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ItemKind::Const(box ConstItem { defaultness: _, generics, ty, expr }) => {
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try_visit!(visitor.visit_generics(generics));
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try_visit!(visitor.visit_ty(ty));
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visit_opt!(visitor, visit_expr, expr);
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}
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ItemKind::Fn(box Fn { defaultness: _, generics, sig, body }) => {
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let kind = FnKind::Fn(FnCtxt::Free, *ident, sig, vis, generics, body.as_deref());
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try_visit!(visitor.visit_fn(kind, *span, *id));
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}
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ItemKind::Mod(_unsafety, mod_kind) => match mod_kind {
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ModKind::Loaded(items, _inline, _inner_span) => {
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walk_list!(visitor, visit_item, items);
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}
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ModKind::Unloaded => {}
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},
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ItemKind::ForeignMod(ForeignMod { extern_span: _, safety: _, abi: _, items }) => {
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walk_list!(visitor, visit_foreign_item, items);
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}
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ItemKind::GlobalAsm(asm) => try_visit!(visitor.visit_inline_asm(asm)),
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ItemKind::TyAlias(box TyAlias {
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generics,
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bounds,
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|
ty,
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defaultness: _,
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|
where_clauses: _,
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}) => {
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try_visit!(visitor.visit_generics(generics));
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walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
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|
visit_opt!(visitor, visit_ty, ty);
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}
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|
ItemKind::Enum(enum_definition, generics) => {
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|
try_visit!(visitor.visit_generics(generics));
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|
try_visit!(visitor.visit_enum_def(enum_definition));
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|
}
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|
ItemKind::Impl(box Impl {
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|
defaultness: _,
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|
safety: _,
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|
generics,
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|
constness: _,
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|
polarity: _,
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|
of_trait,
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|
self_ty,
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|
items,
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|
}) => {
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|
try_visit!(visitor.visit_generics(generics));
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|
visit_opt!(visitor, visit_trait_ref, of_trait);
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|
try_visit!(visitor.visit_ty(self_ty));
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|
walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Impl);
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|
}
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|
ItemKind::Struct(struct_definition, generics)
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|
| ItemKind::Union(struct_definition, generics) => {
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|
try_visit!(visitor.visit_generics(generics));
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|
try_visit!(visitor.visit_variant_data(struct_definition));
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|
}
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|
ItemKind::Trait(box Trait { safety: _, is_auto: _, generics, bounds, items }) => {
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|
try_visit!(visitor.visit_generics(generics));
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|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::SuperTraits);
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|
walk_list!(visitor, visit_assoc_item, items, AssocCtxt::Trait);
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|
}
|
|
ItemKind::TraitAlias(generics, bounds) => {
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|
try_visit!(visitor.visit_generics(generics));
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|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
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|
}
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|
ItemKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
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|
ItemKind::MacroDef(ts) => try_visit!(visitor.visit_mac_def(ts, *id)),
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|
ItemKind::Delegation(box Delegation {
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|
id,
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|
qself,
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|
path,
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|
rename,
|
|
body,
|
|
from_glob: _,
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|
}) => {
|
|
try_visit!(walk_qself(visitor, qself));
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|
try_visit!(visitor.visit_path(path, *id));
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|
visit_opt!(visitor, visit_ident, rename);
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|
visit_opt!(visitor, visit_block, body);
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|
}
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|
ItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => {
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|
try_visit!(walk_qself(visitor, qself));
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|
try_visit!(visitor.visit_path(prefix, *id));
|
|
if let Some(suffixes) = suffixes {
|
|
for (ident, rename) in suffixes {
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|
visitor.visit_ident(ident);
|
|
if let Some(rename) = rename {
|
|
visitor.visit_ident(rename);
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|
}
|
|
}
|
|
}
|
|
visit_opt!(visitor, visit_block, body);
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|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
}
|
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|
|
pub fn walk_item<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
item: &'a Item<impl WalkItemKind>,
|
|
) -> V::Result {
|
|
walk_assoc_item(visitor, item, AssocCtxt::Trait /*ignored*/)
|
|
}
|
|
|
|
pub fn walk_enum_def<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
EnumDef { variants }: &'a EnumDef,
|
|
) -> V::Result {
|
|
walk_list!(visitor, visit_variant, variants);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_variant<'a, V: Visitor<'a>>(visitor: &mut V, variant: &'a Variant) -> V::Result
|
|
where
|
|
V: Visitor<'a>,
|
|
{
|
|
let Variant { attrs, id: _, span: _, vis, ident, data, disr_expr, is_placeholder: _ } = variant;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_vis(vis));
|
|
try_visit!(visitor.visit_ident(ident));
|
|
try_visit!(visitor.visit_variant_data(data));
|
|
visit_opt!(visitor, visit_variant_discr, disr_expr);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_expr_field<'a, V: Visitor<'a>>(visitor: &mut V, f: &'a ExprField) -> V::Result {
|
|
let ExprField { attrs, id: _, span: _, ident, expr, is_shorthand: _, is_placeholder: _ } = f;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_ident(ident));
|
|
try_visit!(visitor.visit_expr(expr));
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_pat_field<'a, V: Visitor<'a>>(visitor: &mut V, fp: &'a PatField) -> V::Result {
|
|
let PatField { ident, pat, is_shorthand: _, attrs, id: _, span: _, is_placeholder: _ } = fp;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_ident(ident));
|
|
try_visit!(visitor.visit_pat(pat));
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) -> V::Result {
|
|
let Ty { id, kind, span: _, tokens: _ } = typ;
|
|
match kind {
|
|
TyKind::Slice(ty) | TyKind::Paren(ty) => try_visit!(visitor.visit_ty(ty)),
|
|
TyKind::Ptr(MutTy { ty, mutbl: _ }) => try_visit!(visitor.visit_ty(ty)),
|
|
TyKind::Ref(opt_lifetime, MutTy { ty, mutbl: _ })
|
|
| TyKind::PinnedRef(opt_lifetime, MutTy { ty, mutbl: _ }) => {
|
|
visit_opt!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Ref);
|
|
try_visit!(visitor.visit_ty(ty));
|
|
}
|
|
TyKind::Tup(tuple_element_types) => {
|
|
walk_list!(visitor, visit_ty, tuple_element_types);
|
|
}
|
|
TyKind::BareFn(function_declaration) => {
|
|
let BareFnTy { safety: _, ext: _, generic_params, decl, decl_span: _ } =
|
|
&**function_declaration;
|
|
walk_list!(visitor, visit_generic_param, generic_params);
|
|
try_visit!(walk_fn_decl(visitor, decl));
|
|
}
|
|
TyKind::Path(maybe_qself, path) => {
|
|
try_visit!(walk_qself(visitor, maybe_qself));
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
}
|
|
TyKind::Pat(ty, pat) => {
|
|
try_visit!(visitor.visit_ty(ty));
|
|
try_visit!(visitor.visit_pat(pat));
|
|
}
|
|
TyKind::Array(ty, length) => {
|
|
try_visit!(visitor.visit_ty(ty));
|
|
try_visit!(visitor.visit_anon_const(length));
|
|
}
|
|
TyKind::TraitObject(bounds, _syntax) => {
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::TraitObject);
|
|
}
|
|
TyKind::ImplTrait(_id, bounds) => {
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Impl);
|
|
}
|
|
TyKind::Typeof(expression) => try_visit!(visitor.visit_anon_const(expression)),
|
|
TyKind::Infer | TyKind::ImplicitSelf | TyKind::Dummy => {}
|
|
TyKind::Err(_guar) => {}
|
|
TyKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
|
|
TyKind::Never | TyKind::CVarArgs => {}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
fn walk_qself<'a, V: Visitor<'a>>(visitor: &mut V, qself: &'a Option<P<QSelf>>) -> V::Result {
|
|
if let Some(qself) = qself {
|
|
let QSelf { ty, path_span: _, position: _ } = &**qself;
|
|
try_visit!(visitor.visit_ty(ty));
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_path<'a, V: Visitor<'a>>(visitor: &mut V, path: &'a Path) -> V::Result {
|
|
let Path { span: _, segments, tokens: _ } = path;
|
|
walk_list!(visitor, visit_path_segment, segments);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_use_tree<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
use_tree: &'a UseTree,
|
|
id: NodeId,
|
|
) -> V::Result {
|
|
let UseTree { prefix, kind, span: _ } = use_tree;
|
|
try_visit!(visitor.visit_path(prefix, id));
|
|
match kind {
|
|
UseTreeKind::Simple(rename) => {
|
|
// The extra IDs are handled during AST lowering.
|
|
visit_opt!(visitor, visit_ident, rename);
|
|
}
|
|
UseTreeKind::Glob => {}
|
|
UseTreeKind::Nested { ref items, span: _ } => {
|
|
for &(ref nested_tree, nested_id) in items {
|
|
try_visit!(visitor.visit_use_tree(nested_tree, nested_id, true));
|
|
}
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_path_segment<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
segment: &'a PathSegment,
|
|
) -> V::Result {
|
|
let PathSegment { ident, id: _, args } = segment;
|
|
try_visit!(visitor.visit_ident(ident));
|
|
visit_opt!(visitor, visit_generic_args, args);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_generic_args<'a, V>(visitor: &mut V, generic_args: &'a GenericArgs) -> V::Result
|
|
where
|
|
V: Visitor<'a>,
|
|
{
|
|
match generic_args {
|
|
GenericArgs::AngleBracketed(AngleBracketedArgs { span: _, args }) => {
|
|
for arg in args {
|
|
match arg {
|
|
AngleBracketedArg::Arg(a) => try_visit!(visitor.visit_generic_arg(a)),
|
|
AngleBracketedArg::Constraint(c) => {
|
|
try_visit!(visitor.visit_assoc_item_constraint(c))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
GenericArgs::Parenthesized(data) => {
|
|
let ParenthesizedArgs { span: _, inputs, inputs_span: _, output } = data;
|
|
walk_list!(visitor, visit_ty, inputs);
|
|
try_visit!(visitor.visit_fn_ret_ty(output));
|
|
}
|
|
GenericArgs::ParenthesizedElided(_span) => {}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_generic_arg<'a, V>(visitor: &mut V, generic_arg: &'a GenericArg) -> V::Result
|
|
where
|
|
V: Visitor<'a>,
|
|
{
|
|
match generic_arg {
|
|
GenericArg::Lifetime(lt) => visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg),
|
|
GenericArg::Type(ty) => visitor.visit_ty(ty),
|
|
GenericArg::Const(ct) => visitor.visit_anon_const(ct),
|
|
}
|
|
}
|
|
|
|
pub fn walk_assoc_item_constraint<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
constraint: &'a AssocItemConstraint,
|
|
) -> V::Result {
|
|
let AssocItemConstraint { id: _, ident, gen_args, kind, span: _ } = constraint;
|
|
try_visit!(visitor.visit_ident(ident));
|
|
visit_opt!(visitor, visit_generic_args, gen_args);
|
|
match kind {
|
|
AssocItemConstraintKind::Equality { term } => match term {
|
|
Term::Ty(ty) => try_visit!(visitor.visit_ty(ty)),
|
|
Term::Const(c) => try_visit!(visitor.visit_anon_const(c)),
|
|
},
|
|
AssocItemConstraintKind::Bound { bounds } => {
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) -> V::Result {
|
|
let Pat { id, kind, span: _, tokens: _ } = pattern;
|
|
match kind {
|
|
PatKind::TupleStruct(opt_qself, path, elems) => {
|
|
try_visit!(walk_qself(visitor, opt_qself));
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
walk_list!(visitor, visit_pat, elems);
|
|
}
|
|
PatKind::Path(opt_qself, path) => {
|
|
try_visit!(walk_qself(visitor, opt_qself));
|
|
try_visit!(visitor.visit_path(path, *id))
|
|
}
|
|
PatKind::Struct(opt_qself, path, fields, _rest) => {
|
|
try_visit!(walk_qself(visitor, opt_qself));
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
walk_list!(visitor, visit_pat_field, fields);
|
|
}
|
|
PatKind::Box(subpattern) | PatKind::Deref(subpattern) | PatKind::Paren(subpattern) => {
|
|
try_visit!(visitor.visit_pat(subpattern));
|
|
}
|
|
PatKind::Ref(subpattern, _ /*mutbl*/) => {
|
|
try_visit!(visitor.visit_pat(subpattern));
|
|
}
|
|
PatKind::Ident(_bmode, ident, optional_subpattern) => {
|
|
try_visit!(visitor.visit_ident(ident));
|
|
visit_opt!(visitor, visit_pat, optional_subpattern);
|
|
}
|
|
PatKind::Lit(expression) => try_visit!(visitor.visit_expr(expression)),
|
|
PatKind::Range(lower_bound, upper_bound, _end) => {
|
|
visit_opt!(visitor, visit_expr, lower_bound);
|
|
visit_opt!(visitor, visit_expr, upper_bound);
|
|
}
|
|
PatKind::Wild | PatKind::Rest | PatKind::Never => {}
|
|
PatKind::Err(_guar) => {}
|
|
PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => {
|
|
walk_list!(visitor, visit_pat, elems);
|
|
}
|
|
PatKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
impl WalkItemKind for ForeignItemKind {
|
|
fn walk<'a, V: Visitor<'a>>(
|
|
&'a self,
|
|
item: &'a Item<Self>,
|
|
_ctxt: AssocCtxt,
|
|
visitor: &mut V,
|
|
) -> V::Result {
|
|
let &Item { id, span, ident, ref vis, .. } = item;
|
|
match self {
|
|
ForeignItemKind::Static(box StaticItem { ty, mutability: _, expr, safety: _ }) => {
|
|
try_visit!(visitor.visit_ty(ty));
|
|
visit_opt!(visitor, visit_expr, expr);
|
|
}
|
|
ForeignItemKind::Fn(box Fn { defaultness: _, generics, sig, body }) => {
|
|
let kind = FnKind::Fn(FnCtxt::Foreign, ident, sig, vis, generics, body.as_deref());
|
|
try_visit!(visitor.visit_fn(kind, span, id));
|
|
}
|
|
ForeignItemKind::TyAlias(box TyAlias {
|
|
generics,
|
|
bounds,
|
|
ty,
|
|
defaultness: _,
|
|
where_clauses: _,
|
|
}) => {
|
|
try_visit!(visitor.visit_generics(generics));
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
|
|
visit_opt!(visitor, visit_ty, ty);
|
|
}
|
|
ForeignItemKind::MacCall(mac) => {
|
|
try_visit!(visitor.visit_mac_call(mac));
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
}
|
|
|
|
pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) -> V::Result {
|
|
match bound {
|
|
GenericBound::Trait(trait_ref) => visitor.visit_poly_trait_ref(trait_ref),
|
|
GenericBound::Outlives(lifetime) => visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound),
|
|
GenericBound::Use(args, _span) => {
|
|
walk_list!(visitor, visit_precise_capturing_arg, args);
|
|
V::Result::output()
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn walk_precise_capturing_arg<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
arg: &'a PreciseCapturingArg,
|
|
) {
|
|
match arg {
|
|
PreciseCapturingArg::Lifetime(lt) => {
|
|
visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg);
|
|
}
|
|
PreciseCapturingArg::Arg(path, id) => {
|
|
visitor.visit_path(path, *id);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn walk_generic_param<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
param: &'a GenericParam,
|
|
) -> V::Result {
|
|
let GenericParam { id: _, ident, attrs, bounds, is_placeholder: _, kind, colon_span: _ } =
|
|
param;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_ident(ident));
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
|
|
match kind {
|
|
GenericParamKind::Lifetime => (),
|
|
GenericParamKind::Type { default } => visit_opt!(visitor, visit_ty, default),
|
|
GenericParamKind::Const { ty, default, kw_span: _ } => {
|
|
try_visit!(visitor.visit_ty(ty));
|
|
visit_opt!(visitor, visit_anon_const, default);
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_generics<'a, V: Visitor<'a>>(visitor: &mut V, generics: &'a Generics) -> V::Result {
|
|
let Generics { params, where_clause, span: _ } = generics;
|
|
let WhereClause { has_where_token: _, predicates, span: _ } = where_clause;
|
|
walk_list!(visitor, visit_generic_param, params);
|
|
walk_list!(visitor, visit_where_predicate, predicates);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_closure_binder<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
binder: &'a ClosureBinder,
|
|
) -> V::Result {
|
|
match binder {
|
|
ClosureBinder::NotPresent => {}
|
|
ClosureBinder::For { generic_params, span: _ } => {
|
|
walk_list!(visitor, visit_generic_param, generic_params)
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_where_predicate<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
predicate: &'a WherePredicate,
|
|
) -> V::Result {
|
|
match predicate {
|
|
WherePredicate::BoundPredicate(WhereBoundPredicate {
|
|
bounded_ty,
|
|
bounds,
|
|
bound_generic_params,
|
|
span: _,
|
|
}) => {
|
|
walk_list!(visitor, visit_generic_param, bound_generic_params);
|
|
try_visit!(visitor.visit_ty(bounded_ty));
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
|
|
}
|
|
WherePredicate::RegionPredicate(WhereRegionPredicate { lifetime, bounds, span: _ }) => {
|
|
try_visit!(visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound));
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
|
|
}
|
|
WherePredicate::EqPredicate(WhereEqPredicate { lhs_ty, rhs_ty, span: _ }) => {
|
|
try_visit!(visitor.visit_ty(lhs_ty));
|
|
try_visit!(visitor.visit_ty(rhs_ty));
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FnRetTy) -> V::Result {
|
|
match ret_ty {
|
|
FnRetTy::Default(_span) => {}
|
|
FnRetTy::Ty(output_ty) => try_visit!(visitor.visit_ty(output_ty)),
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_fn_decl<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
FnDecl { inputs, output }: &'a FnDecl,
|
|
) -> V::Result {
|
|
walk_list!(visitor, visit_param, inputs);
|
|
visitor.visit_fn_ret_ty(output)
|
|
}
|
|
|
|
pub fn walk_fn<'a, V: Visitor<'a>>(visitor: &mut V, kind: FnKind<'a>) -> V::Result {
|
|
match kind {
|
|
FnKind::Fn(_ctxt, _ident, FnSig { header, decl, span: _ }, _vis, generics, body) => {
|
|
// Identifier and visibility are visited as a part of the item.
|
|
try_visit!(visitor.visit_fn_header(header));
|
|
try_visit!(visitor.visit_generics(generics));
|
|
try_visit!(walk_fn_decl(visitor, decl));
|
|
visit_opt!(visitor, visit_block, body);
|
|
}
|
|
FnKind::Closure(binder, _coroutine_kind, decl, body) => {
|
|
try_visit!(visitor.visit_closure_binder(binder));
|
|
try_visit!(walk_fn_decl(visitor, decl));
|
|
try_visit!(visitor.visit_expr(body));
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
impl WalkItemKind for AssocItemKind {
|
|
fn walk<'a, V: Visitor<'a>>(
|
|
&'a self,
|
|
item: &'a Item<Self>,
|
|
ctxt: AssocCtxt,
|
|
visitor: &mut V,
|
|
) -> V::Result {
|
|
let &Item { id, span, ident, ref vis, .. } = item;
|
|
match self {
|
|
AssocItemKind::Const(box ConstItem { defaultness: _, generics, ty, expr }) => {
|
|
try_visit!(visitor.visit_generics(generics));
|
|
try_visit!(visitor.visit_ty(ty));
|
|
visit_opt!(visitor, visit_expr, expr);
|
|
}
|
|
AssocItemKind::Fn(box Fn { defaultness: _, generics, sig, body }) => {
|
|
let kind =
|
|
FnKind::Fn(FnCtxt::Assoc(ctxt), ident, sig, vis, generics, body.as_deref());
|
|
try_visit!(visitor.visit_fn(kind, span, id));
|
|
}
|
|
AssocItemKind::Type(box TyAlias {
|
|
generics,
|
|
bounds,
|
|
ty,
|
|
defaultness: _,
|
|
where_clauses: _,
|
|
}) => {
|
|
try_visit!(visitor.visit_generics(generics));
|
|
walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
|
|
visit_opt!(visitor, visit_ty, ty);
|
|
}
|
|
AssocItemKind::MacCall(mac) => {
|
|
try_visit!(visitor.visit_mac_call(mac));
|
|
}
|
|
AssocItemKind::Delegation(box Delegation {
|
|
id,
|
|
qself,
|
|
path,
|
|
rename,
|
|
body,
|
|
from_glob: _,
|
|
}) => {
|
|
try_visit!(walk_qself(visitor, qself));
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
visit_opt!(visitor, visit_ident, rename);
|
|
visit_opt!(visitor, visit_block, body);
|
|
}
|
|
AssocItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => {
|
|
try_visit!(walk_qself(visitor, qself));
|
|
try_visit!(visitor.visit_path(prefix, id));
|
|
if let Some(suffixes) = suffixes {
|
|
for (ident, rename) in suffixes {
|
|
visitor.visit_ident(ident);
|
|
if let Some(rename) = rename {
|
|
visitor.visit_ident(rename);
|
|
}
|
|
}
|
|
}
|
|
visit_opt!(visitor, visit_block, body);
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
}
|
|
|
|
pub fn walk_assoc_item<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
item: &'a Item<impl WalkItemKind>,
|
|
ctxt: AssocCtxt,
|
|
) -> V::Result {
|
|
let Item { id: _, span: _, ident, vis, attrs, kind, tokens: _ } = item;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_vis(vis));
|
|
try_visit!(visitor.visit_ident(ident));
|
|
try_visit!(kind.walk(item, ctxt, visitor));
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_struct_def<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
struct_definition: &'a VariantData,
|
|
) -> V::Result {
|
|
walk_list!(visitor, visit_field_def, struct_definition.fields());
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_field_def<'a, V: Visitor<'a>>(visitor: &mut V, field: &'a FieldDef) -> V::Result {
|
|
let FieldDef { attrs, id: _, span: _, vis, ident, ty, is_placeholder: _ } = field;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_vis(vis));
|
|
visit_opt!(visitor, visit_ident, ident);
|
|
try_visit!(visitor.visit_ty(ty));
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_block<'a, V: Visitor<'a>>(visitor: &mut V, block: &'a Block) -> V::Result {
|
|
let Block { stmts, id: _, rules: _, span: _, tokens: _, could_be_bare_literal: _ } = block;
|
|
walk_list!(visitor, visit_stmt, stmts);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_stmt<'a, V: Visitor<'a>>(visitor: &mut V, statement: &'a Stmt) -> V::Result {
|
|
let Stmt { id: _, kind, span: _ } = statement;
|
|
match kind {
|
|
StmtKind::Let(local) => try_visit!(visitor.visit_local(local)),
|
|
StmtKind::Item(item) => try_visit!(visitor.visit_item(item)),
|
|
StmtKind::Expr(expr) | StmtKind::Semi(expr) => try_visit!(visitor.visit_expr(expr)),
|
|
StmtKind::Empty => {}
|
|
StmtKind::MacCall(mac) => {
|
|
let MacCallStmt { mac, attrs, style: _, tokens: _ } = &**mac;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_mac_call(mac));
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_mac<'a, V: Visitor<'a>>(visitor: &mut V, mac: &'a MacCall) -> V::Result {
|
|
let MacCall { path, args: _ } = mac;
|
|
visitor.visit_path(path, DUMMY_NODE_ID)
|
|
}
|
|
|
|
pub fn walk_anon_const<'a, V: Visitor<'a>>(visitor: &mut V, constant: &'a AnonConst) -> V::Result {
|
|
let AnonConst { id: _, value } = constant;
|
|
visitor.visit_expr(value)
|
|
}
|
|
|
|
pub fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) -> V::Result {
|
|
let InlineAsm {
|
|
asm_macro: _,
|
|
template: _,
|
|
template_strs: _,
|
|
operands,
|
|
clobber_abis: _,
|
|
options: _,
|
|
line_spans: _,
|
|
} = asm;
|
|
for (op, _span) in operands {
|
|
match op {
|
|
InlineAsmOperand::In { expr, reg: _ }
|
|
| InlineAsmOperand::Out { expr: Some(expr), reg: _, late: _ }
|
|
| InlineAsmOperand::InOut { expr, reg: _, late: _ } => {
|
|
try_visit!(visitor.visit_expr(expr))
|
|
}
|
|
InlineAsmOperand::Out { expr: None, reg: _, late: _ } => {}
|
|
InlineAsmOperand::SplitInOut { in_expr, out_expr, reg: _, late: _ } => {
|
|
try_visit!(visitor.visit_expr(in_expr));
|
|
visit_opt!(visitor, visit_expr, out_expr);
|
|
}
|
|
InlineAsmOperand::Const { anon_const } => {
|
|
try_visit!(visitor.visit_anon_const(anon_const))
|
|
}
|
|
InlineAsmOperand::Sym { sym } => try_visit!(visitor.visit_inline_asm_sym(sym)),
|
|
InlineAsmOperand::Label { block } => try_visit!(visitor.visit_block(block)),
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_inline_asm_sym<'a, V: Visitor<'a>>(
|
|
visitor: &mut V,
|
|
InlineAsmSym { id, qself, path }: &'a InlineAsmSym,
|
|
) -> V::Result {
|
|
try_visit!(walk_qself(visitor, qself));
|
|
visitor.visit_path(path, *id)
|
|
}
|
|
|
|
pub fn walk_format_args<'a, V: Visitor<'a>>(visitor: &mut V, fmt: &'a FormatArgs) -> V::Result {
|
|
let FormatArgs { span: _, template: _, arguments } = fmt;
|
|
for FormatArgument { kind, expr } in arguments.all_args() {
|
|
match kind {
|
|
FormatArgumentKind::Named(ident) | FormatArgumentKind::Captured(ident) => {
|
|
try_visit!(visitor.visit_ident(ident))
|
|
}
|
|
FormatArgumentKind::Normal => {}
|
|
}
|
|
try_visit!(visitor.visit_expr(expr));
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) -> V::Result {
|
|
let Expr { id, kind, span, attrs, tokens: _ } = expression;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
match kind {
|
|
ExprKind::Array(subexpressions) => {
|
|
walk_list!(visitor, visit_expr, subexpressions);
|
|
}
|
|
ExprKind::ConstBlock(anon_const) => try_visit!(visitor.visit_anon_const(anon_const)),
|
|
ExprKind::Repeat(element, count) => {
|
|
try_visit!(visitor.visit_expr(element));
|
|
try_visit!(visitor.visit_anon_const(count));
|
|
}
|
|
ExprKind::Struct(se) => {
|
|
let StructExpr { qself, path, fields, rest } = &**se;
|
|
try_visit!(walk_qself(visitor, qself));
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
walk_list!(visitor, visit_expr_field, fields);
|
|
match rest {
|
|
StructRest::Base(expr) => try_visit!(visitor.visit_expr(expr)),
|
|
StructRest::Rest(_span) => {}
|
|
StructRest::None => {}
|
|
}
|
|
}
|
|
ExprKind::Tup(subexpressions) => {
|
|
walk_list!(visitor, visit_expr, subexpressions);
|
|
}
|
|
ExprKind::Call(callee_expression, arguments) => {
|
|
try_visit!(visitor.visit_expr(callee_expression));
|
|
walk_list!(visitor, visit_expr, arguments);
|
|
}
|
|
ExprKind::MethodCall(box MethodCall { seg, receiver, args, span: _ }) => {
|
|
try_visit!(visitor.visit_expr(receiver));
|
|
try_visit!(visitor.visit_path_segment(seg));
|
|
walk_list!(visitor, visit_expr, args);
|
|
}
|
|
ExprKind::Binary(_op, left_expression, right_expression) => {
|
|
try_visit!(visitor.visit_expr(left_expression));
|
|
try_visit!(visitor.visit_expr(right_expression));
|
|
}
|
|
ExprKind::AddrOf(_kind, _mutbl, subexpression) => {
|
|
try_visit!(visitor.visit_expr(subexpression));
|
|
}
|
|
ExprKind::Unary(_op, subexpression) => {
|
|
try_visit!(visitor.visit_expr(subexpression));
|
|
}
|
|
ExprKind::Cast(subexpression, typ) | ExprKind::Type(subexpression, typ) => {
|
|
try_visit!(visitor.visit_expr(subexpression));
|
|
try_visit!(visitor.visit_ty(typ));
|
|
}
|
|
ExprKind::Let(pat, expr, _span, _recovered) => {
|
|
try_visit!(visitor.visit_pat(pat));
|
|
try_visit!(visitor.visit_expr(expr));
|
|
}
|
|
ExprKind::If(head_expression, if_block, optional_else) => {
|
|
try_visit!(visitor.visit_expr(head_expression));
|
|
try_visit!(visitor.visit_block(if_block));
|
|
visit_opt!(visitor, visit_expr, optional_else);
|
|
}
|
|
ExprKind::While(subexpression, block, opt_label) => {
|
|
visit_opt!(visitor, visit_label, opt_label);
|
|
try_visit!(visitor.visit_expr(subexpression));
|
|
try_visit!(visitor.visit_block(block));
|
|
}
|
|
ExprKind::ForLoop { pat, iter, body, label, kind: _ } => {
|
|
visit_opt!(visitor, visit_label, label);
|
|
try_visit!(visitor.visit_pat(pat));
|
|
try_visit!(visitor.visit_expr(iter));
|
|
try_visit!(visitor.visit_block(body));
|
|
}
|
|
ExprKind::Loop(block, opt_label, _span) => {
|
|
visit_opt!(visitor, visit_label, opt_label);
|
|
try_visit!(visitor.visit_block(block));
|
|
}
|
|
ExprKind::Match(subexpression, arms, _kind) => {
|
|
try_visit!(visitor.visit_expr(subexpression));
|
|
walk_list!(visitor, visit_arm, arms);
|
|
}
|
|
ExprKind::Closure(box Closure {
|
|
binder,
|
|
capture_clause,
|
|
coroutine_kind,
|
|
constness: _,
|
|
movability: _,
|
|
fn_decl,
|
|
body,
|
|
fn_decl_span: _,
|
|
fn_arg_span: _,
|
|
}) => {
|
|
try_visit!(visitor.visit_capture_by(capture_clause));
|
|
try_visit!(visitor.visit_fn(
|
|
FnKind::Closure(binder, coroutine_kind, fn_decl, body),
|
|
*span,
|
|
*id
|
|
))
|
|
}
|
|
ExprKind::Block(block, opt_label) => {
|
|
visit_opt!(visitor, visit_label, opt_label);
|
|
try_visit!(visitor.visit_block(block));
|
|
}
|
|
ExprKind::Gen(_capt, body, _kind, _decl_span) => try_visit!(visitor.visit_block(body)),
|
|
ExprKind::Await(expr, _span) => try_visit!(visitor.visit_expr(expr)),
|
|
ExprKind::Assign(lhs, rhs, _span) => {
|
|
try_visit!(visitor.visit_expr(lhs));
|
|
try_visit!(visitor.visit_expr(rhs));
|
|
}
|
|
ExprKind::AssignOp(_op, left_expression, right_expression) => {
|
|
try_visit!(visitor.visit_expr(left_expression));
|
|
try_visit!(visitor.visit_expr(right_expression));
|
|
}
|
|
ExprKind::Field(subexpression, ident) => {
|
|
try_visit!(visitor.visit_expr(subexpression));
|
|
try_visit!(visitor.visit_ident(ident));
|
|
}
|
|
ExprKind::Index(main_expression, index_expression, _span) => {
|
|
try_visit!(visitor.visit_expr(main_expression));
|
|
try_visit!(visitor.visit_expr(index_expression));
|
|
}
|
|
ExprKind::Range(start, end, _limit) => {
|
|
visit_opt!(visitor, visit_expr, start);
|
|
visit_opt!(visitor, visit_expr, end);
|
|
}
|
|
ExprKind::Underscore => {}
|
|
ExprKind::Path(maybe_qself, path) => {
|
|
try_visit!(walk_qself(visitor, maybe_qself));
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
}
|
|
ExprKind::Break(opt_label, opt_expr) => {
|
|
visit_opt!(visitor, visit_label, opt_label);
|
|
visit_opt!(visitor, visit_expr, opt_expr);
|
|
}
|
|
ExprKind::Continue(opt_label) => {
|
|
visit_opt!(visitor, visit_label, opt_label);
|
|
}
|
|
ExprKind::Ret(optional_expression) => {
|
|
visit_opt!(visitor, visit_expr, optional_expression);
|
|
}
|
|
ExprKind::Yeet(optional_expression) => {
|
|
visit_opt!(visitor, visit_expr, optional_expression);
|
|
}
|
|
ExprKind::Become(expr) => try_visit!(visitor.visit_expr(expr)),
|
|
ExprKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
|
|
ExprKind::Paren(subexpression) => try_visit!(visitor.visit_expr(subexpression)),
|
|
ExprKind::InlineAsm(asm) => try_visit!(visitor.visit_inline_asm(asm)),
|
|
ExprKind::FormatArgs(f) => try_visit!(visitor.visit_format_args(f)),
|
|
ExprKind::OffsetOf(container, fields) => {
|
|
try_visit!(visitor.visit_ty(container));
|
|
walk_list!(visitor, visit_ident, fields.iter());
|
|
}
|
|
ExprKind::Yield(optional_expression) => {
|
|
visit_opt!(visitor, visit_expr, optional_expression);
|
|
}
|
|
ExprKind::Try(subexpression) => try_visit!(visitor.visit_expr(subexpression)),
|
|
ExprKind::TryBlock(body) => try_visit!(visitor.visit_block(body)),
|
|
ExprKind::Lit(_token) => {}
|
|
ExprKind::IncludedBytes(_bytes) => {}
|
|
ExprKind::Err(_guar) => {}
|
|
ExprKind::Dummy => {}
|
|
}
|
|
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Param) -> V::Result {
|
|
let Param { attrs, ty, pat, id: _, span: _, is_placeholder: _ } = param;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_pat(pat));
|
|
try_visit!(visitor.visit_ty(ty));
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_arm<'a, V: Visitor<'a>>(visitor: &mut V, arm: &'a Arm) -> V::Result {
|
|
let Arm { attrs, pat, guard, body, span: _, id: _, is_placeholder: _ } = arm;
|
|
walk_list!(visitor, visit_attribute, attrs);
|
|
try_visit!(visitor.visit_pat(pat));
|
|
visit_opt!(visitor, visit_expr, guard);
|
|
visit_opt!(visitor, visit_expr, body);
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_vis<'a, V: Visitor<'a>>(visitor: &mut V, vis: &'a Visibility) -> V::Result {
|
|
let Visibility { kind, span: _, tokens: _ } = vis;
|
|
match kind {
|
|
VisibilityKind::Restricted { path, id, shorthand: _ } => {
|
|
try_visit!(visitor.visit_path(path, *id));
|
|
}
|
|
VisibilityKind::Public | VisibilityKind::Inherited => {}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_attribute<'a, V: Visitor<'a>>(visitor: &mut V, attr: &'a Attribute) -> V::Result {
|
|
let Attribute { kind, id: _, style: _, span: _ } = attr;
|
|
match kind {
|
|
AttrKind::Normal(normal) => {
|
|
let NormalAttr { item, tokens: _ } = &**normal;
|
|
let AttrItem { unsafety: _, path, args, tokens: _ } = item;
|
|
try_visit!(visitor.visit_path(path, DUMMY_NODE_ID));
|
|
try_visit!(walk_attr_args(visitor, args));
|
|
}
|
|
AttrKind::DocComment(_kind, _sym) => {}
|
|
}
|
|
V::Result::output()
|
|
}
|
|
|
|
pub fn walk_attr_args<'a, V: Visitor<'a>>(visitor: &mut V, args: &'a AttrArgs) -> V::Result {
|
|
match args {
|
|
AttrArgs::Empty => {}
|
|
AttrArgs::Delimited(_args) => {}
|
|
AttrArgs::Eq(_eq_span, AttrArgsEq::Ast(expr)) => try_visit!(visitor.visit_expr(expr)),
|
|
AttrArgs::Eq(_eq_span, AttrArgsEq::Hir(lit)) => {
|
|
unreachable!("in literal form when walking mac args eq: {:?}", lit)
|
|
}
|
|
}
|
|
V::Result::output()
|
|
}
|