4ae328bef4
Properly handle attributes on statements We now collect tokens for the underlying node wrapped by `StmtKind` nstead of storing tokens directly in `Stmt`. `LazyTokenStream` now supports capturing a trailing semicolon after it is initially constructed. This allows us to avoid refactoring statement parsing to wrap the parsing of the semicolon in `parse_tokens`. Attributes on item statements (e.g. `fn foo() { #[bar] struct MyStruct; }`) are now treated as item attributes, not statement attributes, which is consistent with how we handle attributes on other kinds of statements. The feature-gating code is adjusted so that proc-macro attributes are still allowed on item statements on stable. Two built-in macros (`#[global_allocator]` and `#[test]`) needed to be adjusted to support being passed `Annotatable::Stmt`.
1373 lines
47 KiB
Rust
1373 lines
47 KiB
Rust
//! A `MutVisitor` represents an AST modification; it accepts an AST piece and
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//! and mutates it in place. So, for instance, macro expansion is a `MutVisitor`
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//! that walks over an AST and modifies it.
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//!
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//! Note: using a `MutVisitor` (other than the `MacroExpander` `MutVisitor`) on
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//! an AST before macro expansion is probably a bad idea. For instance,
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//! a `MutVisitor` renaming item names in a module will miss all of those
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//! that are created by the expansion of a macro.
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use crate::ast::*;
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use crate::ptr::P;
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use crate::token::{self, Token};
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use crate::tokenstream::*;
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use rustc_data_structures::map_in_place::MapInPlace;
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use rustc_data_structures::sync::Lrc;
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use rustc_span::source_map::Spanned;
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use rustc_span::symbol::Ident;
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use rustc_span::Span;
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use smallvec::{smallvec, Array, SmallVec};
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use std::ops::DerefMut;
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use std::{panic, process, ptr};
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pub trait ExpectOne<A: Array> {
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fn expect_one(self, err: &'static str) -> A::Item;
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}
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impl<A: Array> ExpectOne<A> for SmallVec<A> {
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fn expect_one(self, err: &'static str) -> A::Item {
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assert!(self.len() == 1, err);
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self.into_iter().next().unwrap()
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}
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}
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pub trait MutVisitor: Sized {
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/// Mutable token visiting only exists for the `macro_rules` token marker and should not be
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/// used otherwise. Token visitor would be entirely separate from the regular visitor if
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/// the marker didn't have to visit AST fragments in nonterminal tokens.
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fn token_visiting_enabled(&self) -> bool {
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false
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}
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// Methods in this trait have one of three forms:
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//
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// fn visit_t(&mut self, t: &mut T); // common
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// fn flat_map_t(&mut self, t: T) -> SmallVec<[T; 1]>; // rare
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// fn filter_map_t(&mut self, t: T) -> Option<T>; // rarest
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//
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// Any additions to this trait should happen in form of a call to a public
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// `noop_*` function that only calls out to the visitor again, not other
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// `noop_*` functions. This is a necessary API workaround to the problem of
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// not being able to call out to the super default method in an overridden
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// default method.
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//
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// When writing these methods, it is better to use destructuring like this:
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//
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// fn visit_abc(&mut self, ABC { a, b, c: _ }: &mut ABC) {
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// visit_a(a);
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// visit_b(b);
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// }
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//
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// than to use field access like this:
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//
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// fn visit_abc(&mut self, abc: &mut ABC) {
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// visit_a(&mut abc.a);
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// visit_b(&mut abc.b);
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// // ignore abc.c
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// }
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//
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// As well as being more concise, the former is explicit about which fields
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// are skipped. Furthermore, if a new field is added, the destructuring
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// version will cause a compile error, which is good. In comparison, the
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// field access version will continue working and it would be easy to
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// forget to add handling for it.
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fn visit_crate(&mut self, c: &mut Crate) {
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noop_visit_crate(c, self)
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}
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fn visit_meta_list_item(&mut self, list_item: &mut NestedMetaItem) {
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noop_visit_meta_list_item(list_item, self);
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}
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fn visit_meta_item(&mut self, meta_item: &mut MetaItem) {
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noop_visit_meta_item(meta_item, self);
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}
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fn visit_use_tree(&mut self, use_tree: &mut UseTree) {
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noop_visit_use_tree(use_tree, self);
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}
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fn flat_map_foreign_item(&mut self, ni: P<ForeignItem>) -> SmallVec<[P<ForeignItem>; 1]> {
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noop_flat_map_foreign_item(ni, self)
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}
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fn flat_map_item(&mut self, i: P<Item>) -> SmallVec<[P<Item>; 1]> {
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noop_flat_map_item(i, self)
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}
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fn visit_fn_header(&mut self, header: &mut FnHeader) {
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noop_visit_fn_header(header, self);
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}
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fn flat_map_struct_field(&mut self, sf: StructField) -> SmallVec<[StructField; 1]> {
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noop_flat_map_struct_field(sf, self)
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}
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fn visit_item_kind(&mut self, i: &mut ItemKind) {
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noop_visit_item_kind(i, self);
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}
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fn flat_map_trait_item(&mut self, i: P<AssocItem>) -> SmallVec<[P<AssocItem>; 1]> {
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noop_flat_map_assoc_item(i, self)
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}
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fn flat_map_impl_item(&mut self, i: P<AssocItem>) -> SmallVec<[P<AssocItem>; 1]> {
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noop_flat_map_assoc_item(i, self)
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}
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fn visit_fn_decl(&mut self, d: &mut P<FnDecl>) {
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noop_visit_fn_decl(d, self);
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}
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fn visit_asyncness(&mut self, a: &mut Async) {
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noop_visit_asyncness(a, self);
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}
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fn visit_block(&mut self, b: &mut P<Block>) {
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noop_visit_block(b, self);
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}
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fn flat_map_stmt(&mut self, s: Stmt) -> SmallVec<[Stmt; 1]> {
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noop_flat_map_stmt(s, self)
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}
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fn flat_map_arm(&mut self, arm: Arm) -> SmallVec<[Arm; 1]> {
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noop_flat_map_arm(arm, self)
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}
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fn visit_pat(&mut self, p: &mut P<Pat>) {
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noop_visit_pat(p, self);
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}
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fn visit_anon_const(&mut self, c: &mut AnonConst) {
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noop_visit_anon_const(c, self);
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}
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fn visit_expr(&mut self, e: &mut P<Expr>) {
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noop_visit_expr(e, self);
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}
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fn filter_map_expr(&mut self, e: P<Expr>) -> Option<P<Expr>> {
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noop_filter_map_expr(e, self)
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}
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fn visit_generic_arg(&mut self, arg: &mut GenericArg) {
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noop_visit_generic_arg(arg, self);
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}
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fn visit_ty(&mut self, t: &mut P<Ty>) {
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noop_visit_ty(t, self);
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}
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fn visit_lifetime(&mut self, l: &mut Lifetime) {
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noop_visit_lifetime(l, self);
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}
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fn visit_ty_constraint(&mut self, t: &mut AssocTyConstraint) {
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noop_visit_ty_constraint(t, self);
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}
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fn visit_mod(&mut self, m: &mut Mod) {
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noop_visit_mod(m, self);
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}
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fn visit_foreign_mod(&mut self, nm: &mut ForeignMod) {
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noop_visit_foreign_mod(nm, self);
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}
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fn flat_map_variant(&mut self, v: Variant) -> SmallVec<[Variant; 1]> {
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noop_flat_map_variant(v, self)
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}
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fn visit_ident(&mut self, i: &mut Ident) {
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noop_visit_ident(i, self);
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}
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fn visit_path(&mut self, p: &mut Path) {
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noop_visit_path(p, self);
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}
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fn visit_qself(&mut self, qs: &mut Option<QSelf>) {
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noop_visit_qself(qs, self);
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}
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fn visit_generic_args(&mut self, p: &mut GenericArgs) {
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noop_visit_generic_args(p, self);
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}
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fn visit_angle_bracketed_parameter_data(&mut self, p: &mut AngleBracketedArgs) {
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noop_visit_angle_bracketed_parameter_data(p, self);
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}
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fn visit_parenthesized_parameter_data(&mut self, p: &mut ParenthesizedArgs) {
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noop_visit_parenthesized_parameter_data(p, self);
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}
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fn visit_local(&mut self, l: &mut P<Local>) {
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noop_visit_local(l, self);
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}
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fn visit_mac_call(&mut self, mac: &mut MacCall) {
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noop_visit_mac(mac, self);
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}
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fn visit_macro_def(&mut self, def: &mut MacroDef) {
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noop_visit_macro_def(def, self);
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}
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fn visit_label(&mut self, label: &mut Label) {
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noop_visit_label(label, self);
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}
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fn visit_attribute(&mut self, at: &mut Attribute) {
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noop_visit_attribute(at, self);
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}
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fn flat_map_param(&mut self, param: Param) -> SmallVec<[Param; 1]> {
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noop_flat_map_param(param, self)
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}
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fn visit_generics(&mut self, generics: &mut Generics) {
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noop_visit_generics(generics, self);
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}
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fn visit_trait_ref(&mut self, tr: &mut TraitRef) {
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noop_visit_trait_ref(tr, self);
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}
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fn visit_poly_trait_ref(&mut self, p: &mut PolyTraitRef) {
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noop_visit_poly_trait_ref(p, self);
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}
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fn visit_variant_data(&mut self, vdata: &mut VariantData) {
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noop_visit_variant_data(vdata, self);
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}
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fn flat_map_generic_param(&mut self, param: GenericParam) -> SmallVec<[GenericParam; 1]> {
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noop_flat_map_generic_param(param, self)
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}
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fn visit_param_bound(&mut self, tpb: &mut GenericBound) {
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noop_visit_param_bound(tpb, self);
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}
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fn visit_mt(&mut self, mt: &mut MutTy) {
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noop_visit_mt(mt, self);
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}
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fn flat_map_field(&mut self, f: Field) -> SmallVec<[Field; 1]> {
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noop_flat_map_field(f, self)
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}
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fn visit_where_clause(&mut self, where_clause: &mut WhereClause) {
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noop_visit_where_clause(where_clause, self);
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}
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fn visit_where_predicate(&mut self, where_predicate: &mut WherePredicate) {
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noop_visit_where_predicate(where_predicate, self);
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}
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fn visit_vis(&mut self, vis: &mut Visibility) {
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noop_visit_vis(vis, self);
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}
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fn visit_id(&mut self, _id: &mut NodeId) {
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// Do nothing.
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}
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fn visit_span(&mut self, _sp: &mut Span) {
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// Do nothing.
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}
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fn flat_map_field_pattern(&mut self, fp: FieldPat) -> SmallVec<[FieldPat; 1]> {
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noop_flat_map_field_pattern(fp, self)
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}
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}
|
|
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|
/// Use a map-style function (`FnOnce(T) -> T`) to overwrite a `&mut T`. Useful
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/// when using a `flat_map_*` or `filter_map_*` method within a `visit_`
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/// method. Abort the program if the closure panics.
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//
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// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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pub fn visit_clobber<T, F>(t: &mut T, f: F)
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where
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F: FnOnce(T) -> T,
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{
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unsafe {
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// Safe because `t` is used in a read-only fashion by `read()` before
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// being overwritten by `write()`.
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let old_t = ptr::read(t);
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let new_t = panic::catch_unwind(panic::AssertUnwindSafe(|| f(old_t)))
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.unwrap_or_else(|_| process::abort());
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ptr::write(t, new_t);
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}
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}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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|
#[inline]
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|
pub fn visit_vec<T, F>(elems: &mut Vec<T>, mut visit_elem: F)
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|
where
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F: FnMut(&mut T),
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{
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for elem in elems {
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visit_elem(elem);
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}
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}
|
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|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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#[inline]
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pub fn visit_opt<T, F>(opt: &mut Option<T>, mut visit_elem: F)
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where
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F: FnMut(&mut T),
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{
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|
if let Some(elem) = opt {
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visit_elem(elem);
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}
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}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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|
pub fn visit_attrs<T: MutVisitor>(attrs: &mut Vec<Attribute>, vis: &mut T) {
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visit_vec(attrs, |attr| vis.visit_attribute(attr));
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}
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|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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pub fn visit_thin_attrs<T: MutVisitor>(attrs: &mut AttrVec, vis: &mut T) {
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for attr in attrs.iter_mut() {
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vis.visit_attribute(attr);
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}
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}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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pub fn visit_exprs<T: MutVisitor>(exprs: &mut Vec<P<Expr>>, vis: &mut T) {
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exprs.flat_map_in_place(|expr| vis.filter_map_expr(expr))
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}
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|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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pub fn visit_bounds<T: MutVisitor>(bounds: &mut GenericBounds, vis: &mut T) {
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visit_vec(bounds, |bound| vis.visit_param_bound(bound));
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}
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|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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|
pub fn visit_fn_sig<T: MutVisitor>(FnSig { header, decl, span }: &mut FnSig, vis: &mut T) {
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vis.visit_fn_header(header);
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vis.visit_fn_decl(decl);
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vis.visit_span(span);
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}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
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pub fn visit_mac_args<T: MutVisitor>(args: &mut MacArgs, vis: &mut T) {
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match args {
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MacArgs::Empty => {}
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|
MacArgs::Delimited(dspan, _delim, tokens) => {
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visit_delim_span(dspan, vis);
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|
visit_tts(tokens, vis);
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|
}
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|
MacArgs::Eq(eq_span, tokens) => {
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vis.visit_span(eq_span);
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|
visit_tts(tokens, vis);
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|
// The value in `#[key = VALUE]` must be visited as an expression for backward
|
|
// compatibility, so that macros can be expanded in that position.
|
|
if !vis.token_visiting_enabled() {
|
|
if let Some(TokenTree::Token(token)) = tokens.trees_ref().next() {
|
|
if let token::Interpolated(..) = token.kind {
|
|
// ^^ Do not `make_mut` unless we have to.
|
|
match Lrc::make_mut(&mut tokens.0).get_mut(0) {
|
|
Some((TokenTree::Token(token), _spacing)) => match &mut token.kind {
|
|
token::Interpolated(nt) => match Lrc::make_mut(nt) {
|
|
token::NtExpr(expr) => vis.visit_expr(expr),
|
|
t => panic!("unexpected token in key-value attribute: {:?}", t),
|
|
},
|
|
t => panic!("unexpected token in key-value attribute: {:?}", t),
|
|
},
|
|
t => panic!("unexpected token in key-value attribute: {:?}", t),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn visit_delim_span<T: MutVisitor>(dspan: &mut DelimSpan, vis: &mut T) {
|
|
vis.visit_span(&mut dspan.open);
|
|
vis.visit_span(&mut dspan.close);
|
|
}
|
|
|
|
pub fn noop_flat_map_field_pattern<T: MutVisitor>(
|
|
mut fp: FieldPat,
|
|
vis: &mut T,
|
|
) -> SmallVec<[FieldPat; 1]> {
|
|
let FieldPat { attrs, id, ident, is_placeholder: _, is_shorthand: _, pat, span } = &mut fp;
|
|
vis.visit_id(id);
|
|
vis.visit_ident(ident);
|
|
vis.visit_pat(pat);
|
|
vis.visit_span(span);
|
|
visit_thin_attrs(attrs, vis);
|
|
smallvec![fp]
|
|
}
|
|
|
|
pub fn noop_visit_use_tree<T: MutVisitor>(use_tree: &mut UseTree, vis: &mut T) {
|
|
let UseTree { prefix, kind, span } = use_tree;
|
|
vis.visit_path(prefix);
|
|
match kind {
|
|
UseTreeKind::Simple(rename, id1, id2) => {
|
|
visit_opt(rename, |rename| vis.visit_ident(rename));
|
|
vis.visit_id(id1);
|
|
vis.visit_id(id2);
|
|
}
|
|
UseTreeKind::Nested(items) => {
|
|
for (tree, id) in items {
|
|
vis.visit_use_tree(tree);
|
|
vis.visit_id(id);
|
|
}
|
|
}
|
|
UseTreeKind::Glob => {}
|
|
}
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_flat_map_arm<T: MutVisitor>(mut arm: Arm, vis: &mut T) -> SmallVec<[Arm; 1]> {
|
|
let Arm { attrs, pat, guard, body, span, id, is_placeholder: _ } = &mut arm;
|
|
visit_attrs(attrs, vis);
|
|
vis.visit_id(id);
|
|
vis.visit_pat(pat);
|
|
visit_opt(guard, |guard| vis.visit_expr(guard));
|
|
vis.visit_expr(body);
|
|
vis.visit_span(span);
|
|
smallvec![arm]
|
|
}
|
|
|
|
pub fn noop_visit_ty_constraint<T: MutVisitor>(
|
|
AssocTyConstraint { id, ident, gen_args, kind, span }: &mut AssocTyConstraint,
|
|
vis: &mut T,
|
|
) {
|
|
vis.visit_id(id);
|
|
vis.visit_ident(ident);
|
|
if let Some(ref mut gen_args) = gen_args {
|
|
vis.visit_generic_args(gen_args);
|
|
}
|
|
match kind {
|
|
AssocTyConstraintKind::Equality { ref mut ty } => {
|
|
vis.visit_ty(ty);
|
|
}
|
|
AssocTyConstraintKind::Bound { ref mut bounds } => {
|
|
visit_bounds(bounds, vis);
|
|
}
|
|
}
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_ty<T: MutVisitor>(ty: &mut P<Ty>, vis: &mut T) {
|
|
let Ty { id, kind, span, tokens } = ty.deref_mut();
|
|
vis.visit_id(id);
|
|
match kind {
|
|
TyKind::Infer | TyKind::ImplicitSelf | TyKind::Err | TyKind::Never | TyKind::CVarArgs => {}
|
|
TyKind::Slice(ty) => vis.visit_ty(ty),
|
|
TyKind::Ptr(mt) => vis.visit_mt(mt),
|
|
TyKind::Rptr(lt, mt) => {
|
|
visit_opt(lt, |lt| noop_visit_lifetime(lt, vis));
|
|
vis.visit_mt(mt);
|
|
}
|
|
TyKind::BareFn(bft) => {
|
|
let BareFnTy { unsafety: _, ext: _, generic_params, decl } = bft.deref_mut();
|
|
generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param));
|
|
vis.visit_fn_decl(decl);
|
|
}
|
|
TyKind::Tup(tys) => visit_vec(tys, |ty| vis.visit_ty(ty)),
|
|
TyKind::Paren(ty) => vis.visit_ty(ty),
|
|
TyKind::Path(qself, path) => {
|
|
vis.visit_qself(qself);
|
|
vis.visit_path(path);
|
|
}
|
|
TyKind::Array(ty, length) => {
|
|
vis.visit_ty(ty);
|
|
vis.visit_anon_const(length);
|
|
}
|
|
TyKind::Typeof(expr) => vis.visit_anon_const(expr),
|
|
TyKind::TraitObject(bounds, _syntax) => {
|
|
visit_vec(bounds, |bound| vis.visit_param_bound(bound))
|
|
}
|
|
TyKind::ImplTrait(id, bounds) => {
|
|
vis.visit_id(id);
|
|
visit_vec(bounds, |bound| vis.visit_param_bound(bound));
|
|
}
|
|
TyKind::MacCall(mac) => vis.visit_mac_call(mac),
|
|
}
|
|
vis.visit_span(span);
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
|
|
pub fn noop_visit_foreign_mod<T: MutVisitor>(foreign_mod: &mut ForeignMod, vis: &mut T) {
|
|
let ForeignMod { unsafety: _, abi: _, items } = foreign_mod;
|
|
items.flat_map_in_place(|item| vis.flat_map_foreign_item(item));
|
|
}
|
|
|
|
pub fn noop_flat_map_variant<T: MutVisitor>(
|
|
mut variant: Variant,
|
|
visitor: &mut T,
|
|
) -> SmallVec<[Variant; 1]> {
|
|
let Variant { ident, vis, attrs, id, data, disr_expr, span, is_placeholder: _ } = &mut variant;
|
|
visitor.visit_ident(ident);
|
|
visitor.visit_vis(vis);
|
|
visit_attrs(attrs, visitor);
|
|
visitor.visit_id(id);
|
|
visitor.visit_variant_data(data);
|
|
visit_opt(disr_expr, |disr_expr| visitor.visit_anon_const(disr_expr));
|
|
visitor.visit_span(span);
|
|
smallvec![variant]
|
|
}
|
|
|
|
pub fn noop_visit_ident<T: MutVisitor>(Ident { name: _, span }: &mut Ident, vis: &mut T) {
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_path<T: MutVisitor>(Path { segments, span, tokens }: &mut Path, vis: &mut T) {
|
|
vis.visit_span(span);
|
|
for PathSegment { ident, id, args } in segments {
|
|
vis.visit_ident(ident);
|
|
vis.visit_id(id);
|
|
visit_opt(args, |args| vis.visit_generic_args(args));
|
|
}
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
|
|
pub fn noop_visit_qself<T: MutVisitor>(qself: &mut Option<QSelf>, vis: &mut T) {
|
|
visit_opt(qself, |QSelf { ty, path_span, position: _ }| {
|
|
vis.visit_ty(ty);
|
|
vis.visit_span(path_span);
|
|
})
|
|
}
|
|
|
|
pub fn noop_visit_generic_args<T: MutVisitor>(generic_args: &mut GenericArgs, vis: &mut T) {
|
|
match generic_args {
|
|
GenericArgs::AngleBracketed(data) => vis.visit_angle_bracketed_parameter_data(data),
|
|
GenericArgs::Parenthesized(data) => vis.visit_parenthesized_parameter_data(data),
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_generic_arg<T: MutVisitor>(arg: &mut GenericArg, vis: &mut T) {
|
|
match arg {
|
|
GenericArg::Lifetime(lt) => vis.visit_lifetime(lt),
|
|
GenericArg::Type(ty) => vis.visit_ty(ty),
|
|
GenericArg::Const(ct) => vis.visit_anon_const(ct),
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_angle_bracketed_parameter_data<T: MutVisitor>(
|
|
data: &mut AngleBracketedArgs,
|
|
vis: &mut T,
|
|
) {
|
|
let AngleBracketedArgs { args, span } = data;
|
|
visit_vec(args, |arg| match arg {
|
|
AngleBracketedArg::Arg(arg) => vis.visit_generic_arg(arg),
|
|
AngleBracketedArg::Constraint(constraint) => vis.visit_ty_constraint(constraint),
|
|
});
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_parenthesized_parameter_data<T: MutVisitor>(
|
|
args: &mut ParenthesizedArgs,
|
|
vis: &mut T,
|
|
) {
|
|
let ParenthesizedArgs { inputs, output, span } = args;
|
|
visit_vec(inputs, |input| vis.visit_ty(input));
|
|
noop_visit_fn_ret_ty(output, vis);
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_local<T: MutVisitor>(local: &mut P<Local>, vis: &mut T) {
|
|
let Local { id, pat, ty, init, span, attrs, tokens } = local.deref_mut();
|
|
vis.visit_id(id);
|
|
vis.visit_pat(pat);
|
|
visit_opt(ty, |ty| vis.visit_ty(ty));
|
|
visit_opt(init, |init| vis.visit_expr(init));
|
|
vis.visit_span(span);
|
|
visit_thin_attrs(attrs, vis);
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
|
|
pub fn noop_visit_attribute<T: MutVisitor>(attr: &mut Attribute, vis: &mut T) {
|
|
let Attribute { kind, id: _, style: _, span } = attr;
|
|
match kind {
|
|
AttrKind::Normal(AttrItem { path, args, tokens }, attr_tokens) => {
|
|
vis.visit_path(path);
|
|
visit_mac_args(args, vis);
|
|
visit_lazy_tts(tokens, vis);
|
|
visit_lazy_tts(attr_tokens, vis);
|
|
}
|
|
AttrKind::DocComment(..) => {}
|
|
}
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_mac<T: MutVisitor>(mac: &mut MacCall, vis: &mut T) {
|
|
let MacCall { path, args, prior_type_ascription: _ } = mac;
|
|
vis.visit_path(path);
|
|
visit_mac_args(args, vis);
|
|
}
|
|
|
|
pub fn noop_visit_macro_def<T: MutVisitor>(macro_def: &mut MacroDef, vis: &mut T) {
|
|
let MacroDef { body, macro_rules: _ } = macro_def;
|
|
visit_mac_args(body, vis);
|
|
}
|
|
|
|
pub fn noop_visit_meta_list_item<T: MutVisitor>(li: &mut NestedMetaItem, vis: &mut T) {
|
|
match li {
|
|
NestedMetaItem::MetaItem(mi) => vis.visit_meta_item(mi),
|
|
NestedMetaItem::Literal(_lit) => {}
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_meta_item<T: MutVisitor>(mi: &mut MetaItem, vis: &mut T) {
|
|
let MetaItem { path: _, kind, span } = mi;
|
|
match kind {
|
|
MetaItemKind::Word => {}
|
|
MetaItemKind::List(mis) => visit_vec(mis, |mi| vis.visit_meta_list_item(mi)),
|
|
MetaItemKind::NameValue(_s) => {}
|
|
}
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_flat_map_param<T: MutVisitor>(mut param: Param, vis: &mut T) -> SmallVec<[Param; 1]> {
|
|
let Param { attrs, id, pat, span, ty, is_placeholder: _ } = &mut param;
|
|
vis.visit_id(id);
|
|
visit_thin_attrs(attrs, vis);
|
|
vis.visit_pat(pat);
|
|
vis.visit_span(span);
|
|
vis.visit_ty(ty);
|
|
smallvec![param]
|
|
}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
|
|
pub fn visit_tt<T: MutVisitor>(tt: &mut TokenTree, vis: &mut T) {
|
|
match tt {
|
|
TokenTree::Token(token) => {
|
|
visit_token(token, vis);
|
|
}
|
|
TokenTree::Delimited(DelimSpan { open, close }, _delim, tts) => {
|
|
vis.visit_span(open);
|
|
vis.visit_span(close);
|
|
visit_tts(tts, vis);
|
|
}
|
|
}
|
|
}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
|
|
pub fn visit_tts<T: MutVisitor>(TokenStream(tts): &mut TokenStream, vis: &mut T) {
|
|
if vis.token_visiting_enabled() && !tts.is_empty() {
|
|
let tts = Lrc::make_mut(tts);
|
|
visit_vec(tts, |(tree, _is_joint)| visit_tt(tree, vis));
|
|
}
|
|
}
|
|
|
|
pub fn visit_lazy_tts<T: MutVisitor>(lazy_tts: &mut Option<LazyTokenStream>, vis: &mut T) {
|
|
if vis.token_visiting_enabled() {
|
|
visit_opt(lazy_tts, |lazy_tts| {
|
|
let mut tts = lazy_tts.create_token_stream();
|
|
visit_tts(&mut tts, vis);
|
|
*lazy_tts = LazyTokenStream::new(tts);
|
|
})
|
|
}
|
|
}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
|
|
// Applies ident visitor if it's an ident; applies other visits to interpolated nodes.
|
|
// In practice the ident part is not actually used by specific visitors right now,
|
|
// but there's a test below checking that it works.
|
|
pub fn visit_token<T: MutVisitor>(t: &mut Token, vis: &mut T) {
|
|
let Token { kind, span } = t;
|
|
match kind {
|
|
token::Ident(name, _) | token::Lifetime(name) => {
|
|
let mut ident = Ident::new(*name, *span);
|
|
vis.visit_ident(&mut ident);
|
|
*name = ident.name;
|
|
*span = ident.span;
|
|
return; // Avoid visiting the span for the second time.
|
|
}
|
|
token::Interpolated(nt) => {
|
|
let mut nt = Lrc::make_mut(nt);
|
|
visit_interpolated(&mut nt, vis);
|
|
}
|
|
_ => {}
|
|
}
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
|
|
/// Applies the visitor to elements of interpolated nodes.
|
|
//
|
|
// N.B., this can occur only when applying a visitor to partially expanded
|
|
// code, where parsed pieces have gotten implanted ito *other* macro
|
|
// invocations. This is relevant for macro hygiene, but possibly not elsewhere.
|
|
//
|
|
// One problem here occurs because the types for flat_map_item, flat_map_stmt,
|
|
// etc., allow the visitor to return *multiple* items; this is a problem for the
|
|
// nodes here, because they insist on having exactly one piece. One solution
|
|
// would be to mangle the MutVisitor trait to include one-to-many and
|
|
// one-to-one versions of these entry points, but that would probably confuse a
|
|
// lot of people and help very few. Instead, I'm just going to put in dynamic
|
|
// checks. I think the performance impact of this will be pretty much
|
|
// nonexistent. The danger is that someone will apply a `MutVisitor` to a
|
|
// partially expanded node, and will be confused by the fact that their
|
|
// `flat_map_item` or `flat_map_stmt` isn't getting called on `NtItem` or `NtStmt`
|
|
// nodes. Hopefully they'll wind up reading this comment, and doing something
|
|
// appropriate.
|
|
//
|
|
// BTW, design choice: I considered just changing the type of, e.g., `NtItem` to
|
|
// contain multiple items, but decided against it when I looked at
|
|
// `parse_item_or_view_item` and tried to figure out what I would do with
|
|
// multiple items there....
|
|
pub fn visit_interpolated<T: MutVisitor>(nt: &mut token::Nonterminal, vis: &mut T) {
|
|
match nt {
|
|
token::NtItem(item) => visit_clobber(item, |item| {
|
|
// This is probably okay, because the only visitors likely to
|
|
// peek inside interpolated nodes will be renamings/markings,
|
|
// which map single items to single items.
|
|
vis.flat_map_item(item).expect_one("expected visitor to produce exactly one item")
|
|
}),
|
|
token::NtBlock(block) => vis.visit_block(block),
|
|
token::NtStmt(stmt) => visit_clobber(stmt, |stmt| {
|
|
// See reasoning above.
|
|
vis.flat_map_stmt(stmt).expect_one("expected visitor to produce exactly one item")
|
|
}),
|
|
token::NtPat(pat) => vis.visit_pat(pat),
|
|
token::NtExpr(expr) => vis.visit_expr(expr),
|
|
token::NtTy(ty) => vis.visit_ty(ty),
|
|
token::NtIdent(ident, _is_raw) => vis.visit_ident(ident),
|
|
token::NtLifetime(ident) => vis.visit_ident(ident),
|
|
token::NtLiteral(expr) => vis.visit_expr(expr),
|
|
token::NtMeta(item) => {
|
|
let AttrItem { path, args, tokens } = item.deref_mut();
|
|
vis.visit_path(path);
|
|
visit_mac_args(args, vis);
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
token::NtPath(path) => vis.visit_path(path),
|
|
token::NtTT(tt) => visit_tt(tt, vis),
|
|
token::NtVis(visib) => vis.visit_vis(visib),
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_asyncness<T: MutVisitor>(asyncness: &mut Async, vis: &mut T) {
|
|
match asyncness {
|
|
Async::Yes { span: _, closure_id, return_impl_trait_id } => {
|
|
vis.visit_id(closure_id);
|
|
vis.visit_id(return_impl_trait_id);
|
|
}
|
|
Async::No => {}
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_fn_decl<T: MutVisitor>(decl: &mut P<FnDecl>, vis: &mut T) {
|
|
let FnDecl { inputs, output } = decl.deref_mut();
|
|
inputs.flat_map_in_place(|param| vis.flat_map_param(param));
|
|
noop_visit_fn_ret_ty(output, vis);
|
|
}
|
|
|
|
pub fn noop_visit_fn_ret_ty<T: MutVisitor>(fn_ret_ty: &mut FnRetTy, vis: &mut T) {
|
|
match fn_ret_ty {
|
|
FnRetTy::Default(span) => vis.visit_span(span),
|
|
FnRetTy::Ty(ty) => vis.visit_ty(ty),
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_param_bound<T: MutVisitor>(pb: &mut GenericBound, vis: &mut T) {
|
|
match pb {
|
|
GenericBound::Trait(ty, _modifier) => vis.visit_poly_trait_ref(ty),
|
|
GenericBound::Outlives(lifetime) => noop_visit_lifetime(lifetime, vis),
|
|
}
|
|
}
|
|
|
|
pub fn noop_flat_map_generic_param<T: MutVisitor>(
|
|
mut param: GenericParam,
|
|
vis: &mut T,
|
|
) -> SmallVec<[GenericParam; 1]> {
|
|
let GenericParam { id, ident, attrs, bounds, kind, is_placeholder: _ } = &mut param;
|
|
vis.visit_id(id);
|
|
vis.visit_ident(ident);
|
|
visit_thin_attrs(attrs, vis);
|
|
visit_vec(bounds, |bound| noop_visit_param_bound(bound, vis));
|
|
match kind {
|
|
GenericParamKind::Lifetime => {}
|
|
GenericParamKind::Type { default } => {
|
|
visit_opt(default, |default| vis.visit_ty(default));
|
|
}
|
|
GenericParamKind::Const { ty, kw_span: _ } => {
|
|
vis.visit_ty(ty);
|
|
}
|
|
}
|
|
smallvec![param]
|
|
}
|
|
|
|
pub fn noop_visit_label<T: MutVisitor>(Label { ident }: &mut Label, vis: &mut T) {
|
|
vis.visit_ident(ident);
|
|
}
|
|
|
|
fn noop_visit_lifetime<T: MutVisitor>(Lifetime { id, ident }: &mut Lifetime, vis: &mut T) {
|
|
vis.visit_id(id);
|
|
vis.visit_ident(ident);
|
|
}
|
|
|
|
pub fn noop_visit_generics<T: MutVisitor>(generics: &mut Generics, vis: &mut T) {
|
|
let Generics { params, where_clause, span } = generics;
|
|
params.flat_map_in_place(|param| vis.flat_map_generic_param(param));
|
|
vis.visit_where_clause(where_clause);
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_where_clause<T: MutVisitor>(wc: &mut WhereClause, vis: &mut T) {
|
|
let WhereClause { has_where_token: _, predicates, span } = wc;
|
|
visit_vec(predicates, |predicate| vis.visit_where_predicate(predicate));
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_visit_where_predicate<T: MutVisitor>(pred: &mut WherePredicate, vis: &mut T) {
|
|
match pred {
|
|
WherePredicate::BoundPredicate(bp) => {
|
|
let WhereBoundPredicate { span, bound_generic_params, bounded_ty, bounds } = bp;
|
|
vis.visit_span(span);
|
|
bound_generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param));
|
|
vis.visit_ty(bounded_ty);
|
|
visit_vec(bounds, |bound| vis.visit_param_bound(bound));
|
|
}
|
|
WherePredicate::RegionPredicate(rp) => {
|
|
let WhereRegionPredicate { span, lifetime, bounds } = rp;
|
|
vis.visit_span(span);
|
|
noop_visit_lifetime(lifetime, vis);
|
|
visit_vec(bounds, |bound| noop_visit_param_bound(bound, vis));
|
|
}
|
|
WherePredicate::EqPredicate(ep) => {
|
|
let WhereEqPredicate { id, span, lhs_ty, rhs_ty } = ep;
|
|
vis.visit_id(id);
|
|
vis.visit_span(span);
|
|
vis.visit_ty(lhs_ty);
|
|
vis.visit_ty(rhs_ty);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_variant_data<T: MutVisitor>(vdata: &mut VariantData, vis: &mut T) {
|
|
match vdata {
|
|
VariantData::Struct(fields, ..) => {
|
|
fields.flat_map_in_place(|field| vis.flat_map_struct_field(field));
|
|
}
|
|
VariantData::Tuple(fields, id) => {
|
|
fields.flat_map_in_place(|field| vis.flat_map_struct_field(field));
|
|
vis.visit_id(id);
|
|
}
|
|
VariantData::Unit(id) => vis.visit_id(id),
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_trait_ref<T: MutVisitor>(TraitRef { path, ref_id }: &mut TraitRef, vis: &mut T) {
|
|
vis.visit_path(path);
|
|
vis.visit_id(ref_id);
|
|
}
|
|
|
|
pub fn noop_visit_poly_trait_ref<T: MutVisitor>(p: &mut PolyTraitRef, vis: &mut T) {
|
|
let PolyTraitRef { bound_generic_params, trait_ref, span } = p;
|
|
bound_generic_params.flat_map_in_place(|param| vis.flat_map_generic_param(param));
|
|
vis.visit_trait_ref(trait_ref);
|
|
vis.visit_span(span);
|
|
}
|
|
|
|
pub fn noop_flat_map_struct_field<T: MutVisitor>(
|
|
mut sf: StructField,
|
|
visitor: &mut T,
|
|
) -> SmallVec<[StructField; 1]> {
|
|
let StructField { span, ident, vis, id, ty, attrs, is_placeholder: _ } = &mut sf;
|
|
visitor.visit_span(span);
|
|
visit_opt(ident, |ident| visitor.visit_ident(ident));
|
|
visitor.visit_vis(vis);
|
|
visitor.visit_id(id);
|
|
visitor.visit_ty(ty);
|
|
visit_attrs(attrs, visitor);
|
|
smallvec![sf]
|
|
}
|
|
|
|
pub fn noop_flat_map_field<T: MutVisitor>(mut f: Field, vis: &mut T) -> SmallVec<[Field; 1]> {
|
|
let Field { ident, expr, span, is_shorthand: _, attrs, id, is_placeholder: _ } = &mut f;
|
|
vis.visit_ident(ident);
|
|
vis.visit_expr(expr);
|
|
vis.visit_id(id);
|
|
vis.visit_span(span);
|
|
visit_thin_attrs(attrs, vis);
|
|
smallvec![f]
|
|
}
|
|
|
|
pub fn noop_visit_mt<T: MutVisitor>(MutTy { ty, mutbl: _ }: &mut MutTy, vis: &mut T) {
|
|
vis.visit_ty(ty);
|
|
}
|
|
|
|
pub fn noop_visit_block<T: MutVisitor>(block: &mut P<Block>, vis: &mut T) {
|
|
let Block { id, stmts, rules: _, span, tokens } = block.deref_mut();
|
|
vis.visit_id(id);
|
|
stmts.flat_map_in_place(|stmt| vis.flat_map_stmt(stmt));
|
|
vis.visit_span(span);
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
|
|
pub fn noop_visit_item_kind<T: MutVisitor>(kind: &mut ItemKind, vis: &mut T) {
|
|
match kind {
|
|
ItemKind::ExternCrate(_orig_name) => {}
|
|
ItemKind::Use(use_tree) => vis.visit_use_tree(use_tree),
|
|
ItemKind::Static(ty, _, expr) | ItemKind::Const(_, ty, expr) => {
|
|
vis.visit_ty(ty);
|
|
visit_opt(expr, |expr| vis.visit_expr(expr));
|
|
}
|
|
ItemKind::Fn(_, sig, generics, body) => {
|
|
visit_fn_sig(sig, vis);
|
|
vis.visit_generics(generics);
|
|
visit_opt(body, |body| vis.visit_block(body));
|
|
}
|
|
ItemKind::Mod(m) => vis.visit_mod(m),
|
|
ItemKind::ForeignMod(nm) => vis.visit_foreign_mod(nm),
|
|
ItemKind::GlobalAsm(_ga) => {}
|
|
ItemKind::TyAlias(_, generics, bounds, ty) => {
|
|
vis.visit_generics(generics);
|
|
visit_bounds(bounds, vis);
|
|
visit_opt(ty, |ty| vis.visit_ty(ty));
|
|
}
|
|
ItemKind::Enum(EnumDef { variants }, generics) => {
|
|
variants.flat_map_in_place(|variant| vis.flat_map_variant(variant));
|
|
vis.visit_generics(generics);
|
|
}
|
|
ItemKind::Struct(variant_data, generics) | ItemKind::Union(variant_data, generics) => {
|
|
vis.visit_variant_data(variant_data);
|
|
vis.visit_generics(generics);
|
|
}
|
|
ItemKind::Impl {
|
|
unsafety: _,
|
|
polarity: _,
|
|
defaultness: _,
|
|
constness: _,
|
|
generics,
|
|
of_trait,
|
|
self_ty,
|
|
items,
|
|
} => {
|
|
vis.visit_generics(generics);
|
|
visit_opt(of_trait, |trait_ref| vis.visit_trait_ref(trait_ref));
|
|
vis.visit_ty(self_ty);
|
|
items.flat_map_in_place(|item| vis.flat_map_impl_item(item));
|
|
}
|
|
ItemKind::Trait(_is_auto, _unsafety, generics, bounds, items) => {
|
|
vis.visit_generics(generics);
|
|
visit_bounds(bounds, vis);
|
|
items.flat_map_in_place(|item| vis.flat_map_trait_item(item));
|
|
}
|
|
ItemKind::TraitAlias(generics, bounds) => {
|
|
vis.visit_generics(generics);
|
|
visit_bounds(bounds, vis);
|
|
}
|
|
ItemKind::MacCall(m) => vis.visit_mac_call(m),
|
|
ItemKind::MacroDef(def) => vis.visit_macro_def(def),
|
|
}
|
|
}
|
|
|
|
pub fn noop_flat_map_assoc_item<T: MutVisitor>(
|
|
mut item: P<AssocItem>,
|
|
visitor: &mut T,
|
|
) -> SmallVec<[P<AssocItem>; 1]> {
|
|
let Item { id, ident, vis, attrs, kind, span, tokens } = item.deref_mut();
|
|
visitor.visit_id(id);
|
|
visitor.visit_ident(ident);
|
|
visitor.visit_vis(vis);
|
|
visit_attrs(attrs, visitor);
|
|
match kind {
|
|
AssocItemKind::Const(_, ty, expr) => {
|
|
visitor.visit_ty(ty);
|
|
visit_opt(expr, |expr| visitor.visit_expr(expr));
|
|
}
|
|
AssocItemKind::Fn(_, sig, generics, body) => {
|
|
visitor.visit_generics(generics);
|
|
visit_fn_sig(sig, visitor);
|
|
visit_opt(body, |body| visitor.visit_block(body));
|
|
}
|
|
AssocItemKind::TyAlias(_, generics, bounds, ty) => {
|
|
visitor.visit_generics(generics);
|
|
visit_bounds(bounds, visitor);
|
|
visit_opt(ty, |ty| visitor.visit_ty(ty));
|
|
}
|
|
AssocItemKind::MacCall(mac) => visitor.visit_mac_call(mac),
|
|
}
|
|
visitor.visit_span(span);
|
|
visit_lazy_tts(tokens, visitor);
|
|
smallvec![item]
|
|
}
|
|
|
|
pub fn noop_visit_fn_header<T: MutVisitor>(header: &mut FnHeader, vis: &mut T) {
|
|
let FnHeader { unsafety: _, asyncness, constness: _, ext: _ } = header;
|
|
vis.visit_asyncness(asyncness);
|
|
}
|
|
|
|
pub fn noop_visit_mod<T: MutVisitor>(module: &mut Mod, vis: &mut T) {
|
|
let Mod { inner, unsafety: _, items, inline: _ } = module;
|
|
vis.visit_span(inner);
|
|
items.flat_map_in_place(|item| vis.flat_map_item(item));
|
|
}
|
|
|
|
pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) {
|
|
visit_clobber(krate, |Crate { module, attrs, span, proc_macros }| {
|
|
let item_vis =
|
|
Visibility { kind: VisibilityKind::Public, span: span.shrink_to_lo(), tokens: None };
|
|
let item = P(Item {
|
|
ident: Ident::invalid(),
|
|
attrs,
|
|
id: DUMMY_NODE_ID,
|
|
vis: item_vis,
|
|
span,
|
|
kind: ItemKind::Mod(module),
|
|
tokens: None,
|
|
});
|
|
let items = vis.flat_map_item(item);
|
|
|
|
let len = items.len();
|
|
if len == 0 {
|
|
let module = Mod { inner: span, unsafety: Unsafe::No, items: vec![], inline: true };
|
|
Crate { module, attrs: vec![], span, proc_macros }
|
|
} else if len == 1 {
|
|
let Item { attrs, span, kind, .. } = items.into_iter().next().unwrap().into_inner();
|
|
match kind {
|
|
ItemKind::Mod(module) => Crate { module, attrs, span, proc_macros },
|
|
_ => panic!("visitor converted a module to not a module"),
|
|
}
|
|
} else {
|
|
panic!("a crate cannot expand to more than one item");
|
|
}
|
|
});
|
|
}
|
|
|
|
// Mutates one item into possibly many items.
|
|
pub fn noop_flat_map_item<T: MutVisitor>(
|
|
mut item: P<Item>,
|
|
visitor: &mut T,
|
|
) -> SmallVec<[P<Item>; 1]> {
|
|
let Item { ident, attrs, id, kind, vis, span, tokens } = item.deref_mut();
|
|
visitor.visit_ident(ident);
|
|
visit_attrs(attrs, visitor);
|
|
visitor.visit_id(id);
|
|
visitor.visit_item_kind(kind);
|
|
visitor.visit_vis(vis);
|
|
visitor.visit_span(span);
|
|
visit_lazy_tts(tokens, visitor);
|
|
|
|
smallvec![item]
|
|
}
|
|
|
|
pub fn noop_flat_map_foreign_item<T: MutVisitor>(
|
|
mut item: P<ForeignItem>,
|
|
visitor: &mut T,
|
|
) -> SmallVec<[P<ForeignItem>; 1]> {
|
|
let Item { ident, attrs, id, kind, vis, span, tokens } = item.deref_mut();
|
|
visitor.visit_id(id);
|
|
visitor.visit_ident(ident);
|
|
visitor.visit_vis(vis);
|
|
visit_attrs(attrs, visitor);
|
|
match kind {
|
|
ForeignItemKind::Static(ty, _, expr) => {
|
|
visitor.visit_ty(ty);
|
|
visit_opt(expr, |expr| visitor.visit_expr(expr));
|
|
}
|
|
ForeignItemKind::Fn(_, sig, generics, body) => {
|
|
visitor.visit_generics(generics);
|
|
visit_fn_sig(sig, visitor);
|
|
visit_opt(body, |body| visitor.visit_block(body));
|
|
}
|
|
ForeignItemKind::TyAlias(_, generics, bounds, ty) => {
|
|
visitor.visit_generics(generics);
|
|
visit_bounds(bounds, visitor);
|
|
visit_opt(ty, |ty| visitor.visit_ty(ty));
|
|
}
|
|
ForeignItemKind::MacCall(mac) => visitor.visit_mac_call(mac),
|
|
}
|
|
visitor.visit_span(span);
|
|
visit_lazy_tts(tokens, visitor);
|
|
smallvec![item]
|
|
}
|
|
|
|
pub fn noop_visit_pat<T: MutVisitor>(pat: &mut P<Pat>, vis: &mut T) {
|
|
let Pat { id, kind, span, tokens } = pat.deref_mut();
|
|
vis.visit_id(id);
|
|
match kind {
|
|
PatKind::Wild | PatKind::Rest => {}
|
|
PatKind::Ident(_binding_mode, ident, sub) => {
|
|
vis.visit_ident(ident);
|
|
visit_opt(sub, |sub| vis.visit_pat(sub));
|
|
}
|
|
PatKind::Lit(e) => vis.visit_expr(e),
|
|
PatKind::TupleStruct(path, elems) => {
|
|
vis.visit_path(path);
|
|
visit_vec(elems, |elem| vis.visit_pat(elem));
|
|
}
|
|
PatKind::Path(qself, path) => {
|
|
vis.visit_qself(qself);
|
|
vis.visit_path(path);
|
|
}
|
|
PatKind::Struct(path, fields, _etc) => {
|
|
vis.visit_path(path);
|
|
fields.flat_map_in_place(|field| vis.flat_map_field_pattern(field));
|
|
}
|
|
PatKind::Box(inner) => vis.visit_pat(inner),
|
|
PatKind::Ref(inner, _mutbl) => vis.visit_pat(inner),
|
|
PatKind::Range(e1, e2, Spanned { span: _, node: _ }) => {
|
|
visit_opt(e1, |e| vis.visit_expr(e));
|
|
visit_opt(e2, |e| vis.visit_expr(e));
|
|
vis.visit_span(span);
|
|
}
|
|
PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => {
|
|
visit_vec(elems, |elem| vis.visit_pat(elem))
|
|
}
|
|
PatKind::Paren(inner) => vis.visit_pat(inner),
|
|
PatKind::MacCall(mac) => vis.visit_mac_call(mac),
|
|
}
|
|
vis.visit_span(span);
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
|
|
pub fn noop_visit_anon_const<T: MutVisitor>(AnonConst { id, value }: &mut AnonConst, vis: &mut T) {
|
|
vis.visit_id(id);
|
|
vis.visit_expr(value);
|
|
}
|
|
|
|
pub fn noop_visit_expr<T: MutVisitor>(
|
|
Expr { kind, id, span, attrs, tokens }: &mut Expr,
|
|
vis: &mut T,
|
|
) {
|
|
match kind {
|
|
ExprKind::Box(expr) => vis.visit_expr(expr),
|
|
ExprKind::Array(exprs) => visit_exprs(exprs, vis),
|
|
ExprKind::ConstBlock(anon_const) => {
|
|
vis.visit_anon_const(anon_const);
|
|
}
|
|
ExprKind::Repeat(expr, count) => {
|
|
vis.visit_expr(expr);
|
|
vis.visit_anon_const(count);
|
|
}
|
|
ExprKind::Tup(exprs) => visit_exprs(exprs, vis),
|
|
ExprKind::Call(f, args) => {
|
|
vis.visit_expr(f);
|
|
visit_exprs(args, vis);
|
|
}
|
|
ExprKind::MethodCall(PathSegment { ident, id, args }, exprs, span) => {
|
|
vis.visit_ident(ident);
|
|
vis.visit_id(id);
|
|
visit_opt(args, |args| vis.visit_generic_args(args));
|
|
visit_exprs(exprs, vis);
|
|
vis.visit_span(span);
|
|
}
|
|
ExprKind::Binary(_binop, lhs, rhs) => {
|
|
vis.visit_expr(lhs);
|
|
vis.visit_expr(rhs);
|
|
}
|
|
ExprKind::Unary(_unop, ohs) => vis.visit_expr(ohs),
|
|
ExprKind::Cast(expr, ty) => {
|
|
vis.visit_expr(expr);
|
|
vis.visit_ty(ty);
|
|
}
|
|
ExprKind::Type(expr, ty) => {
|
|
vis.visit_expr(expr);
|
|
vis.visit_ty(ty);
|
|
}
|
|
ExprKind::AddrOf(_, _, ohs) => vis.visit_expr(ohs),
|
|
ExprKind::Let(pat, scrutinee) => {
|
|
vis.visit_pat(pat);
|
|
vis.visit_expr(scrutinee);
|
|
}
|
|
ExprKind::If(cond, tr, fl) => {
|
|
vis.visit_expr(cond);
|
|
vis.visit_block(tr);
|
|
visit_opt(fl, |fl| vis.visit_expr(fl));
|
|
}
|
|
ExprKind::While(cond, body, label) => {
|
|
vis.visit_expr(cond);
|
|
vis.visit_block(body);
|
|
visit_opt(label, |label| vis.visit_label(label));
|
|
}
|
|
ExprKind::ForLoop(pat, iter, body, label) => {
|
|
vis.visit_pat(pat);
|
|
vis.visit_expr(iter);
|
|
vis.visit_block(body);
|
|
visit_opt(label, |label| vis.visit_label(label));
|
|
}
|
|
ExprKind::Loop(body, label) => {
|
|
vis.visit_block(body);
|
|
visit_opt(label, |label| vis.visit_label(label));
|
|
}
|
|
ExprKind::Match(expr, arms) => {
|
|
vis.visit_expr(expr);
|
|
arms.flat_map_in_place(|arm| vis.flat_map_arm(arm));
|
|
}
|
|
ExprKind::Closure(_capture_by, asyncness, _movability, decl, body, span) => {
|
|
vis.visit_asyncness(asyncness);
|
|
vis.visit_fn_decl(decl);
|
|
vis.visit_expr(body);
|
|
vis.visit_span(span);
|
|
}
|
|
ExprKind::Block(blk, label) => {
|
|
vis.visit_block(blk);
|
|
visit_opt(label, |label| vis.visit_label(label));
|
|
}
|
|
ExprKind::Async(_capture_by, node_id, body) => {
|
|
vis.visit_id(node_id);
|
|
vis.visit_block(body);
|
|
}
|
|
ExprKind::Await(expr) => vis.visit_expr(expr),
|
|
ExprKind::Assign(el, er, _) => {
|
|
vis.visit_expr(el);
|
|
vis.visit_expr(er);
|
|
}
|
|
ExprKind::AssignOp(_op, el, er) => {
|
|
vis.visit_expr(el);
|
|
vis.visit_expr(er);
|
|
}
|
|
ExprKind::Field(el, ident) => {
|
|
vis.visit_expr(el);
|
|
vis.visit_ident(ident);
|
|
}
|
|
ExprKind::Index(el, er) => {
|
|
vis.visit_expr(el);
|
|
vis.visit_expr(er);
|
|
}
|
|
ExprKind::Range(e1, e2, _lim) => {
|
|
visit_opt(e1, |e1| vis.visit_expr(e1));
|
|
visit_opt(e2, |e2| vis.visit_expr(e2));
|
|
}
|
|
ExprKind::Underscore => {}
|
|
ExprKind::Path(qself, path) => {
|
|
vis.visit_qself(qself);
|
|
vis.visit_path(path);
|
|
}
|
|
ExprKind::Break(label, expr) => {
|
|
visit_opt(label, |label| vis.visit_label(label));
|
|
visit_opt(expr, |expr| vis.visit_expr(expr));
|
|
}
|
|
ExprKind::Continue(label) => {
|
|
visit_opt(label, |label| vis.visit_label(label));
|
|
}
|
|
ExprKind::Ret(expr) => {
|
|
visit_opt(expr, |expr| vis.visit_expr(expr));
|
|
}
|
|
ExprKind::InlineAsm(asm) => {
|
|
for (op, _) in &mut asm.operands {
|
|
match op {
|
|
InlineAsmOperand::In { expr, .. }
|
|
| InlineAsmOperand::InOut { expr, .. }
|
|
| InlineAsmOperand::Const { expr, .. }
|
|
| InlineAsmOperand::Sym { expr, .. } => vis.visit_expr(expr),
|
|
InlineAsmOperand::Out { expr, .. } => {
|
|
if let Some(expr) = expr {
|
|
vis.visit_expr(expr);
|
|
}
|
|
}
|
|
InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => {
|
|
vis.visit_expr(in_expr);
|
|
if let Some(out_expr) = out_expr {
|
|
vis.visit_expr(out_expr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ExprKind::LlvmInlineAsm(asm) => {
|
|
let LlvmInlineAsm {
|
|
asm: _,
|
|
asm_str_style: _,
|
|
outputs,
|
|
inputs,
|
|
clobbers: _,
|
|
volatile: _,
|
|
alignstack: _,
|
|
dialect: _,
|
|
} = asm.deref_mut();
|
|
for out in outputs {
|
|
let LlvmInlineAsmOutput { constraint: _, expr, is_rw: _, is_indirect: _ } = out;
|
|
vis.visit_expr(expr);
|
|
}
|
|
visit_vec(inputs, |(_c, expr)| vis.visit_expr(expr));
|
|
}
|
|
ExprKind::MacCall(mac) => vis.visit_mac_call(mac),
|
|
ExprKind::Struct(path, fields, expr) => {
|
|
vis.visit_path(path);
|
|
fields.flat_map_in_place(|field| vis.flat_map_field(field));
|
|
match expr {
|
|
StructRest::Base(expr) => vis.visit_expr(expr),
|
|
StructRest::Rest(_span) => {}
|
|
StructRest::None => {}
|
|
}
|
|
}
|
|
ExprKind::Paren(expr) => {
|
|
vis.visit_expr(expr);
|
|
|
|
// Nodes that are equal modulo `Paren` sugar no-ops should have the same IDs.
|
|
*id = expr.id;
|
|
vis.visit_span(span);
|
|
visit_thin_attrs(attrs, vis);
|
|
return;
|
|
}
|
|
ExprKind::Yield(expr) => {
|
|
visit_opt(expr, |expr| vis.visit_expr(expr));
|
|
}
|
|
ExprKind::Try(expr) => vis.visit_expr(expr),
|
|
ExprKind::TryBlock(body) => vis.visit_block(body),
|
|
ExprKind::Lit(_) | ExprKind::Err => {}
|
|
}
|
|
vis.visit_id(id);
|
|
vis.visit_span(span);
|
|
visit_thin_attrs(attrs, vis);
|
|
visit_lazy_tts(tokens, vis);
|
|
}
|
|
|
|
pub fn noop_filter_map_expr<T: MutVisitor>(mut e: P<Expr>, vis: &mut T) -> Option<P<Expr>> {
|
|
Some({
|
|
vis.visit_expr(&mut e);
|
|
e
|
|
})
|
|
}
|
|
|
|
pub fn noop_flat_map_stmt<T: MutVisitor>(
|
|
Stmt { kind, mut span, mut id }: Stmt,
|
|
vis: &mut T,
|
|
) -> SmallVec<[Stmt; 1]> {
|
|
vis.visit_id(&mut id);
|
|
vis.visit_span(&mut span);
|
|
noop_flat_map_stmt_kind(kind, vis).into_iter().map(|kind| Stmt { id, kind, span }).collect()
|
|
}
|
|
|
|
pub fn noop_flat_map_stmt_kind<T: MutVisitor>(
|
|
kind: StmtKind,
|
|
vis: &mut T,
|
|
) -> SmallVec<[StmtKind; 1]> {
|
|
match kind {
|
|
StmtKind::Local(mut local) => smallvec![StmtKind::Local({
|
|
vis.visit_local(&mut local);
|
|
local
|
|
})],
|
|
StmtKind::Item(item) => vis.flat_map_item(item).into_iter().map(StmtKind::Item).collect(),
|
|
StmtKind::Expr(expr) => vis.filter_map_expr(expr).into_iter().map(StmtKind::Expr).collect(),
|
|
StmtKind::Semi(expr) => vis.filter_map_expr(expr).into_iter().map(StmtKind::Semi).collect(),
|
|
StmtKind::Empty => smallvec![StmtKind::Empty],
|
|
StmtKind::MacCall(mut mac) => {
|
|
let MacCallStmt { mac: mac_, style: _, attrs, tokens } = mac.deref_mut();
|
|
vis.visit_mac_call(mac_);
|
|
visit_thin_attrs(attrs, vis);
|
|
visit_lazy_tts(tokens, vis);
|
|
smallvec![StmtKind::MacCall(mac)]
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn noop_visit_vis<T: MutVisitor>(visibility: &mut Visibility, vis: &mut T) {
|
|
match &mut visibility.kind {
|
|
VisibilityKind::Public | VisibilityKind::Crate(_) | VisibilityKind::Inherited => {}
|
|
VisibilityKind::Restricted { path, id } => {
|
|
vis.visit_path(path);
|
|
vis.visit_id(id);
|
|
}
|
|
}
|
|
vis.visit_span(&mut visibility.span);
|
|
}
|