842 lines
31 KiB
Rust
842 lines
31 KiB
Rust
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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! HIR 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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use syntax::abi::Abi;
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use syntax::ast::{Ident, NodeId, CRATE_NODE_ID, Name};
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use hir::*;
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use hir;
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use syntax::codemap::Span;
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use syntax::ptr::P;
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use syntax::owned_slice::OwnedSlice;
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub enum FnKind<'a> {
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/// fn foo() or extern "Abi" fn foo()
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ItemFn(Ident, &'a Generics, Unsafety, Constness, Abi, Visibility),
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/// fn foo(&self)
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Method(Ident, &'a MethodSig, Option<Visibility>),
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/// |x, y| ...
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/// proc(x, y) ...
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Closure,
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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_mod` method by default calls `visit::walk_mod`.
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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<'v> : Sized {
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fn visit_name(&mut self, _span: Span, _name: Name) {
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// Nothing to do.
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}
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fn visit_ident(&mut self, span: Span, ident: Ident) {
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self.visit_name(span, ident.name);
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}
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fn visit_mod(&mut self, m: &'v Mod, _s: Span, _n: NodeId) { walk_mod(self, m) }
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fn visit_foreign_item(&mut self, i: &'v ForeignItem) { walk_foreign_item(self, i) }
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fn visit_item(&mut self, i: &'v Item) { walk_item(self, i) }
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fn visit_local(&mut self, l: &'v Local) { walk_local(self, l) }
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fn visit_block(&mut self, b: &'v Block) { walk_block(self, b) }
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fn visit_stmt(&mut self, s: &'v Stmt) { walk_stmt(self, s) }
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fn visit_arm(&mut self, a: &'v Arm) { walk_arm(self, a) }
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fn visit_pat(&mut self, p: &'v Pat) { walk_pat(self, p) }
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fn visit_decl(&mut self, d: &'v Decl) { walk_decl(self, d) }
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fn visit_expr(&mut self, ex: &'v Expr) { walk_expr(self, ex) }
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fn visit_expr_post(&mut self, _ex: &'v Expr) { }
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fn visit_ty(&mut self, t: &'v Ty) { walk_ty(self, t) }
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fn visit_generics(&mut self, g: &'v Generics) { walk_generics(self, g) }
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fn visit_fn(&mut self, fk: FnKind<'v>, fd: &'v FnDecl, b: &'v Block, s: Span, _: NodeId) {
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walk_fn(self, fk, fd, b, s)
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}
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fn visit_trait_item(&mut self, ti: &'v TraitItem) { walk_trait_item(self, ti) }
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fn visit_impl_item(&mut self, ii: &'v ImplItem) { walk_impl_item(self, ii) }
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fn visit_trait_ref(&mut self, t: &'v TraitRef) { walk_trait_ref(self, t) }
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fn visit_ty_param_bound(&mut self, bounds: &'v TyParamBound) {
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walk_ty_param_bound(self, bounds)
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}
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fn visit_poly_trait_ref(&mut self, t: &'v PolyTraitRef, m: &'v TraitBoundModifier) {
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walk_poly_trait_ref(self, t, m)
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}
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fn visit_struct_def(&mut self, s: &'v StructDef, _: Ident, _: &'v Generics, _: NodeId) {
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walk_struct_def(self, s)
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}
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fn visit_struct_field(&mut self, s: &'v StructField) { walk_struct_field(self, s) }
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fn visit_enum_def(&mut self, enum_definition: &'v EnumDef,
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generics: &'v Generics) {
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walk_enum_def(self, enum_definition, generics)
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}
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fn visit_variant(&mut self, v: &'v Variant, g: &'v Generics) { walk_variant(self, v, g) }
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/// Visits an optional reference to a lifetime. The `span` is the span of some surrounding
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/// reference should opt_lifetime be None.
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fn visit_opt_lifetime_ref(&mut self,
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_span: Span,
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opt_lifetime: &'v Option<Lifetime>) {
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match *opt_lifetime {
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Some(ref l) => self.visit_lifetime_ref(l),
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None => ()
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}
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}
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fn visit_lifetime_bound(&mut self, lifetime: &'v Lifetime) {
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walk_lifetime_bound(self, lifetime)
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}
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fn visit_lifetime_ref(&mut self, lifetime: &'v Lifetime) {
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walk_lifetime_ref(self, lifetime)
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}
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fn visit_lifetime_def(&mut self, lifetime: &'v LifetimeDef) {
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walk_lifetime_def(self, lifetime)
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}
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fn visit_explicit_self(&mut self, es: &'v ExplicitSelf) {
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walk_explicit_self(self, es)
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}
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fn visit_path(&mut self, path: &'v Path, _id: NodeId) {
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walk_path(self, path)
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}
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fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v PathSegment) {
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walk_path_segment(self, path_span, path_segment)
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}
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fn visit_path_parameters(&mut self, path_span: Span, path_parameters: &'v PathParameters) {
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walk_path_parameters(self, path_span, path_parameters)
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}
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fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding) {
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walk_assoc_type_binding(self, type_binding)
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}
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fn visit_attribute(&mut self, _attr: &'v Attribute) {}
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}
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pub fn walk_crate<'v, V: Visitor<'v>>(visitor: &mut V, krate: &'v Crate) {
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visitor.visit_mod(&krate.module, krate.span, CRATE_NODE_ID);
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for attr in &krate.attrs {
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visitor.visit_attribute(attr);
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}
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}
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pub fn walk_mod<'v, V: Visitor<'v>>(visitor: &mut V, module: &'v Mod) {
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for item in &module.items {
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visitor.visit_item(&**item)
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}
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}
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pub fn walk_local<'v, V: Visitor<'v>>(visitor: &mut V, local: &'v Local) {
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visitor.visit_pat(&*local.pat);
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walk_ty_opt(visitor, &local.ty);
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walk_expr_opt(visitor, &local.init);
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}
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pub fn walk_lifetime_def<'v, V: Visitor<'v>>(visitor: &mut V,
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lifetime_def: &'v LifetimeDef) {
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visitor.visit_name(lifetime_def.lifetime.span, lifetime_def.lifetime.name);
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for bound in &lifetime_def.bounds {
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visitor.visit_lifetime_bound(bound);
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}
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}
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pub fn walk_lifetime_bound<'v, V: Visitor<'v>>(visitor: &mut V,
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lifetime_ref: &'v Lifetime) {
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visitor.visit_lifetime_ref(lifetime_ref)
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}
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pub fn walk_lifetime_ref<'v, V: Visitor<'v>>(visitor: &mut V,
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lifetime_ref: &'v Lifetime) {
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visitor.visit_name(lifetime_ref.span, lifetime_ref.name)
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}
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pub fn walk_explicit_self<'v, V: Visitor<'v>>(visitor: &mut V,
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explicit_self: &'v ExplicitSelf) {
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match explicit_self.node {
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SelfStatic | SelfValue(_) => {},
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SelfRegion(ref lifetime, _, _) => {
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visitor.visit_opt_lifetime_ref(explicit_self.span, lifetime)
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}
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SelfExplicit(ref typ, _) => visitor.visit_ty(&**typ),
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}
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}
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pub fn walk_poly_trait_ref<'v, V>(visitor: &mut V,
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trait_ref: &'v PolyTraitRef,
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_modifier: &'v TraitBoundModifier)
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where V: Visitor<'v>
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{
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walk_lifetime_decls_helper(visitor, &trait_ref.bound_lifetimes);
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visitor.visit_trait_ref(&trait_ref.trait_ref);
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}
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pub fn walk_trait_ref<'v,V>(visitor: &mut V,
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trait_ref: &'v TraitRef)
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where V: Visitor<'v>
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{
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visitor.visit_path(&trait_ref.path, trait_ref.ref_id)
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}
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pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item) {
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visitor.visit_ident(item.span, item.ident);
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match item.node {
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ItemExternCrate(..) => {}
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ItemUse(ref vp) => {
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match vp.node {
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ViewPathSimple(ident, ref path) => {
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visitor.visit_ident(vp.span, ident);
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visitor.visit_path(path, item.id);
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}
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ViewPathGlob(ref path) => {
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visitor.visit_path(path, item.id);
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}
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ViewPathList(ref prefix, ref list) => {
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for id in list {
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match id.node {
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PathListIdent { name, .. } => {
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visitor.visit_ident(id.span, name);
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}
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PathListMod { .. } => ()
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}
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}
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// Note that the `prefix` here is not a complete
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// path, so we don't use `visit_path`.
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walk_path(visitor, prefix);
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}
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}
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}
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ItemStatic(ref typ, _, ref expr) |
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ItemConst(ref typ, ref expr) => {
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visitor.visit_ty(&**typ);
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visitor.visit_expr(&**expr);
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}
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ItemFn(ref declaration, unsafety, constness, abi, ref generics, ref body) => {
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visitor.visit_fn(FnKind::ItemFn(item.ident, generics, unsafety,
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constness, abi, item.vis),
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&**declaration,
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&**body,
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item.span,
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item.id)
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}
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ItemMod(ref module) => {
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visitor.visit_mod(module, item.span, item.id)
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}
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ItemForeignMod(ref foreign_module) => {
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for foreign_item in &foreign_module.items {
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visitor.visit_foreign_item(&**foreign_item)
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}
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}
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ItemTy(ref typ, ref type_parameters) => {
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visitor.visit_ty(&**typ);
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visitor.visit_generics(type_parameters)
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}
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ItemEnum(ref enum_definition, ref type_parameters) => {
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visitor.visit_generics(type_parameters);
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visitor.visit_enum_def(enum_definition, type_parameters)
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}
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ItemDefaultImpl(_, ref trait_ref) => {
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visitor.visit_trait_ref(trait_ref)
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}
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ItemImpl(_, _,
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ref type_parameters,
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ref trait_reference,
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ref typ,
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ref impl_items) => {
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visitor.visit_generics(type_parameters);
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match *trait_reference {
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Some(ref trait_reference) => visitor.visit_trait_ref(trait_reference),
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None => ()
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}
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visitor.visit_ty(&**typ);
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for impl_item in impl_items {
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visitor.visit_impl_item(impl_item);
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}
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}
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ItemStruct(ref struct_definition, ref generics) => {
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visitor.visit_generics(generics);
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visitor.visit_struct_def(&**struct_definition,
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item.ident,
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generics,
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item.id)
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}
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ItemTrait(_, ref generics, ref bounds, ref methods) => {
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visitor.visit_generics(generics);
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walk_ty_param_bounds_helper(visitor, bounds);
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for method in methods {
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visitor.visit_trait_item(method)
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}
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}
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}
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for attr in &item.attrs {
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visitor.visit_attribute(attr);
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}
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}
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pub fn walk_enum_def<'v, V: Visitor<'v>>(visitor: &mut V,
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enum_definition: &'v EnumDef,
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generics: &'v Generics) {
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for variant in &enum_definition.variants {
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visitor.visit_variant(&**variant, generics);
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}
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}
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pub fn walk_variant<'v, V: Visitor<'v>>(visitor: &mut V,
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variant: &'v Variant,
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generics: &'v Generics) {
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visitor.visit_ident(variant.span, variant.node.name);
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match variant.node.kind {
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TupleVariantKind(ref variant_arguments) => {
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for variant_argument in variant_arguments {
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visitor.visit_ty(&*variant_argument.ty)
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}
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}
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StructVariantKind(ref struct_definition) => {
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visitor.visit_struct_def(&**struct_definition,
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variant.node.name,
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generics,
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variant.node.id)
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}
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}
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match variant.node.disr_expr {
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Some(ref expr) => visitor.visit_expr(&**expr),
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None => ()
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}
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for attr in &variant.node.attrs {
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visitor.visit_attribute(attr);
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}
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}
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pub fn skip_ty<'v, V: Visitor<'v>>(_: &mut V, _: &'v Ty) {
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// Empty!
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||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_ty_opt<'v, V: Visitor<'v>>(visitor: &mut V, optional_type: &'v Option<P<Ty>>) {
|
||
|
|
match *optional_type {
|
||
|
|
Some(ref ty) => visitor.visit_ty(&**ty),
|
||
|
|
None => ()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
|
||
|
|
match typ.node {
|
||
|
|
TyVec(ref ty) | TyParen(ref ty) => {
|
||
|
|
visitor.visit_ty(&**ty)
|
||
|
|
}
|
||
|
|
TyPtr(ref mutable_type) => {
|
||
|
|
visitor.visit_ty(&*mutable_type.ty)
|
||
|
|
}
|
||
|
|
TyRptr(ref lifetime, ref mutable_type) => {
|
||
|
|
visitor.visit_opt_lifetime_ref(typ.span, lifetime);
|
||
|
|
visitor.visit_ty(&*mutable_type.ty)
|
||
|
|
}
|
||
|
|
TyTup(ref tuple_element_types) => {
|
||
|
|
for tuple_element_type in tuple_element_types {
|
||
|
|
visitor.visit_ty(&**tuple_element_type)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
TyBareFn(ref function_declaration) => {
|
||
|
|
for argument in &function_declaration.decl.inputs {
|
||
|
|
visitor.visit_ty(&*argument.ty)
|
||
|
|
}
|
||
|
|
walk_fn_ret_ty(visitor, &function_declaration.decl.output);
|
||
|
|
walk_lifetime_decls_helper(visitor, &function_declaration.lifetimes);
|
||
|
|
}
|
||
|
|
TyPath(ref maybe_qself, ref path) => {
|
||
|
|
if let Some(ref qself) = *maybe_qself {
|
||
|
|
visitor.visit_ty(&qself.ty);
|
||
|
|
}
|
||
|
|
visitor.visit_path(path, typ.id);
|
||
|
|
}
|
||
|
|
TyObjectSum(ref ty, ref bounds) => {
|
||
|
|
visitor.visit_ty(&**ty);
|
||
|
|
walk_ty_param_bounds_helper(visitor, bounds);
|
||
|
|
}
|
||
|
|
TyFixedLengthVec(ref ty, ref expression) => {
|
||
|
|
visitor.visit_ty(&**ty);
|
||
|
|
visitor.visit_expr(&**expression)
|
||
|
|
}
|
||
|
|
TyPolyTraitRef(ref bounds) => {
|
||
|
|
walk_ty_param_bounds_helper(visitor, bounds)
|
||
|
|
}
|
||
|
|
TyTypeof(ref expression) => {
|
||
|
|
visitor.visit_expr(&**expression)
|
||
|
|
}
|
||
|
|
TyInfer => {}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_lifetime_decls_helper<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
lifetimes: &'v Vec<LifetimeDef>) {
|
||
|
|
for l in lifetimes {
|
||
|
|
visitor.visit_lifetime_def(l);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_path<'v, V: Visitor<'v>>(visitor: &mut V, path: &'v Path) {
|
||
|
|
for segment in &path.segments {
|
||
|
|
visitor.visit_path_segment(path.span, segment);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_path_segment<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
path_span: Span,
|
||
|
|
segment: &'v PathSegment) {
|
||
|
|
visitor.visit_ident(path_span, segment.identifier);
|
||
|
|
visitor.visit_path_parameters(path_span, &segment.parameters);
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_path_parameters<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
_path_span: Span,
|
||
|
|
path_parameters: &'v PathParameters) {
|
||
|
|
match *path_parameters {
|
||
|
|
hir::AngleBracketedParameters(ref data) => {
|
||
|
|
for typ in data.types.iter() {
|
||
|
|
visitor.visit_ty(&**typ);
|
||
|
|
}
|
||
|
|
for lifetime in &data.lifetimes {
|
||
|
|
visitor.visit_lifetime_ref(lifetime);
|
||
|
|
}
|
||
|
|
for binding in data.bindings.iter() {
|
||
|
|
visitor.visit_assoc_type_binding(&**binding);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
hir::ParenthesizedParameters(ref data) => {
|
||
|
|
for typ in &data.inputs {
|
||
|
|
visitor.visit_ty(&**typ);
|
||
|
|
}
|
||
|
|
if let Some(ref typ) = data.output {
|
||
|
|
visitor.visit_ty(&**typ);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_assoc_type_binding<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
type_binding: &'v TypeBinding) {
|
||
|
|
visitor.visit_ident(type_binding.span, type_binding.ident);
|
||
|
|
visitor.visit_ty(&*type_binding.ty);
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v Pat) {
|
||
|
|
match pattern.node {
|
||
|
|
PatEnum(ref path, ref children) => {
|
||
|
|
visitor.visit_path(path, pattern.id);
|
||
|
|
if let Some(ref children) = *children {
|
||
|
|
for child in children {
|
||
|
|
visitor.visit_pat(&*child)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
PatQPath(ref qself, ref path) => {
|
||
|
|
visitor.visit_ty(&qself.ty);
|
||
|
|
visitor.visit_path(path, pattern.id)
|
||
|
|
}
|
||
|
|
PatStruct(ref path, ref fields, _) => {
|
||
|
|
visitor.visit_path(path, pattern.id);
|
||
|
|
for field in fields {
|
||
|
|
visitor.visit_pat(&*field.node.pat)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
PatTup(ref tuple_elements) => {
|
||
|
|
for tuple_element in tuple_elements {
|
||
|
|
visitor.visit_pat(&**tuple_element)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
PatBox(ref subpattern) |
|
||
|
|
PatRegion(ref subpattern, _) => {
|
||
|
|
visitor.visit_pat(&**subpattern)
|
||
|
|
}
|
||
|
|
PatIdent(_, ref pth1, ref optional_subpattern) => {
|
||
|
|
visitor.visit_ident(pth1.span, pth1.node);
|
||
|
|
match *optional_subpattern {
|
||
|
|
None => {}
|
||
|
|
Some(ref subpattern) => visitor.visit_pat(&**subpattern),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
PatLit(ref expression) => visitor.visit_expr(&**expression),
|
||
|
|
PatRange(ref lower_bound, ref upper_bound) => {
|
||
|
|
visitor.visit_expr(&**lower_bound);
|
||
|
|
visitor.visit_expr(&**upper_bound)
|
||
|
|
}
|
||
|
|
PatWild(_) => (),
|
||
|
|
PatVec(ref prepattern, ref slice_pattern, ref postpatterns) => {
|
||
|
|
for prepattern in prepattern {
|
||
|
|
visitor.visit_pat(&**prepattern)
|
||
|
|
}
|
||
|
|
if let Some(ref slice_pattern) = *slice_pattern {
|
||
|
|
visitor.visit_pat(&**slice_pattern)
|
||
|
|
}
|
||
|
|
for postpattern in postpatterns {
|
||
|
|
visitor.visit_pat(&**postpattern)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_foreign_item<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
foreign_item: &'v ForeignItem) {
|
||
|
|
visitor.visit_ident(foreign_item.span, foreign_item.ident);
|
||
|
|
|
||
|
|
match foreign_item.node {
|
||
|
|
ForeignItemFn(ref function_declaration, ref generics) => {
|
||
|
|
walk_fn_decl(visitor, &**function_declaration);
|
||
|
|
visitor.visit_generics(generics)
|
||
|
|
}
|
||
|
|
ForeignItemStatic(ref typ, _) => visitor.visit_ty(&**typ),
|
||
|
|
}
|
||
|
|
|
||
|
|
for attr in &foreign_item.attrs {
|
||
|
|
visitor.visit_attribute(attr);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_ty_param_bounds_helper<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
bounds: &'v OwnedSlice<TyParamBound>) {
|
||
|
|
for bound in bounds.iter() {
|
||
|
|
visitor.visit_ty_param_bound(bound)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_ty_param_bound<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
bound: &'v TyParamBound) {
|
||
|
|
match *bound {
|
||
|
|
TraitTyParamBound(ref typ, ref modifier) => {
|
||
|
|
visitor.visit_poly_trait_ref(typ, modifier);
|
||
|
|
}
|
||
|
|
RegionTyParamBound(ref lifetime) => {
|
||
|
|
visitor.visit_lifetime_bound(lifetime);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_generics<'v, V: Visitor<'v>>(visitor: &mut V, generics: &'v Generics) {
|
||
|
|
for param in generics.ty_params.iter() {
|
||
|
|
visitor.visit_ident(param.span, param.ident);
|
||
|
|
walk_ty_param_bounds_helper(visitor, ¶m.bounds);
|
||
|
|
walk_ty_opt(visitor, ¶m.default);
|
||
|
|
}
|
||
|
|
walk_lifetime_decls_helper(visitor, &generics.lifetimes);
|
||
|
|
for predicate in &generics.where_clause.predicates {
|
||
|
|
match predicate {
|
||
|
|
&hir::WherePredicate::BoundPredicate(hir::WhereBoundPredicate{ref bounded_ty,
|
||
|
|
ref bounds,
|
||
|
|
..}) => {
|
||
|
|
visitor.visit_ty(&**bounded_ty);
|
||
|
|
walk_ty_param_bounds_helper(visitor, bounds);
|
||
|
|
}
|
||
|
|
&hir::WherePredicate::RegionPredicate(hir::WhereRegionPredicate{ref lifetime,
|
||
|
|
ref bounds,
|
||
|
|
..}) => {
|
||
|
|
visitor.visit_lifetime_ref(lifetime);
|
||
|
|
|
||
|
|
for bound in bounds {
|
||
|
|
visitor.visit_lifetime_ref(bound);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
&hir::WherePredicate::EqPredicate(hir::WhereEqPredicate{id,
|
||
|
|
ref path,
|
||
|
|
ref ty,
|
||
|
|
..}) => {
|
||
|
|
visitor.visit_path(path, id);
|
||
|
|
visitor.visit_ty(&**ty);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FunctionRetTy) {
|
||
|
|
if let Return(ref output_ty) = *ret_ty {
|
||
|
|
visitor.visit_ty(&**output_ty)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_fn_decl<'v, V: Visitor<'v>>(visitor: &mut V, function_declaration: &'v FnDecl) {
|
||
|
|
for argument in &function_declaration.inputs {
|
||
|
|
visitor.visit_pat(&*argument.pat);
|
||
|
|
visitor.visit_ty(&*argument.ty)
|
||
|
|
}
|
||
|
|
walk_fn_ret_ty(visitor, &function_declaration.output)
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_fn<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
function_kind: FnKind<'v>,
|
||
|
|
function_declaration: &'v FnDecl,
|
||
|
|
function_body: &'v Block,
|
||
|
|
_span: Span) {
|
||
|
|
walk_fn_decl(visitor, function_declaration);
|
||
|
|
|
||
|
|
match function_kind {
|
||
|
|
FnKind::ItemFn(_, generics, _, _, _, _) => {
|
||
|
|
visitor.visit_generics(generics);
|
||
|
|
}
|
||
|
|
FnKind::Method(_, sig, _) => {
|
||
|
|
visitor.visit_generics(&sig.generics);
|
||
|
|
visitor.visit_explicit_self(&sig.explicit_self);
|
||
|
|
}
|
||
|
|
FnKind::Closure(..) => {}
|
||
|
|
}
|
||
|
|
|
||
|
|
visitor.visit_block(function_body)
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v TraitItem) {
|
||
|
|
visitor.visit_ident(trait_item.span, trait_item.ident);
|
||
|
|
for attr in &trait_item.attrs {
|
||
|
|
visitor.visit_attribute(attr);
|
||
|
|
}
|
||
|
|
match trait_item.node {
|
||
|
|
ConstTraitItem(ref ty, ref default) => {
|
||
|
|
visitor.visit_ty(ty);
|
||
|
|
if let Some(ref expr) = *default {
|
||
|
|
visitor.visit_expr(expr);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
MethodTraitItem(ref sig, None) => {
|
||
|
|
visitor.visit_explicit_self(&sig.explicit_self);
|
||
|
|
visitor.visit_generics(&sig.generics);
|
||
|
|
walk_fn_decl(visitor, &sig.decl);
|
||
|
|
}
|
||
|
|
MethodTraitItem(ref sig, Some(ref body)) => {
|
||
|
|
visitor.visit_fn(FnKind::Method(trait_item.ident, sig, None), &sig.decl,
|
||
|
|
body, trait_item.span, trait_item.id);
|
||
|
|
}
|
||
|
|
TypeTraitItem(ref bounds, ref default) => {
|
||
|
|
walk_ty_param_bounds_helper(visitor, bounds);
|
||
|
|
walk_ty_opt(visitor, default);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplItem) {
|
||
|
|
visitor.visit_ident(impl_item.span, impl_item.ident);
|
||
|
|
for attr in &impl_item.attrs {
|
||
|
|
visitor.visit_attribute(attr);
|
||
|
|
}
|
||
|
|
match impl_item.node {
|
||
|
|
ConstImplItem(ref ty, ref expr) => {
|
||
|
|
visitor.visit_ty(ty);
|
||
|
|
visitor.visit_expr(expr);
|
||
|
|
}
|
||
|
|
MethodImplItem(ref sig, ref body) => {
|
||
|
|
visitor.visit_fn(FnKind::Method(impl_item.ident, sig, Some(impl_item.vis)), &sig.decl,
|
||
|
|
body, impl_item.span, impl_item.id);
|
||
|
|
}
|
||
|
|
TypeImplItem(ref ty) => {
|
||
|
|
visitor.visit_ty(ty);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_struct_def<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
struct_definition: &'v StructDef) {
|
||
|
|
for field in &struct_definition.fields {
|
||
|
|
visitor.visit_struct_field(field)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_struct_field<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
struct_field: &'v StructField) {
|
||
|
|
if let NamedField(name, _) = struct_field.node.kind {
|
||
|
|
visitor.visit_ident(struct_field.span, name);
|
||
|
|
}
|
||
|
|
|
||
|
|
visitor.visit_ty(&*struct_field.node.ty);
|
||
|
|
|
||
|
|
for attr in &struct_field.node.attrs {
|
||
|
|
visitor.visit_attribute(attr);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_block<'v, V: Visitor<'v>>(visitor: &mut V, block: &'v Block) {
|
||
|
|
for statement in &block.stmts {
|
||
|
|
visitor.visit_stmt(&**statement)
|
||
|
|
}
|
||
|
|
walk_expr_opt(visitor, &block.expr)
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_stmt<'v, V: Visitor<'v>>(visitor: &mut V, statement: &'v Stmt) {
|
||
|
|
match statement.node {
|
||
|
|
StmtDecl(ref declaration, _) => visitor.visit_decl(&**declaration),
|
||
|
|
StmtExpr(ref expression, _) | StmtSemi(ref expression, _) => {
|
||
|
|
visitor.visit_expr(&**expression)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_decl<'v, V: Visitor<'v>>(visitor: &mut V, declaration: &'v Decl) {
|
||
|
|
match declaration.node {
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DeclLocal(ref local) => visitor.visit_local(&**local),
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DeclItem(ref item) => visitor.visit_item(&**item),
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|
}
|
||
|
|
}
|
||
|
|
|
||
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|
pub fn walk_expr_opt<'v, V: Visitor<'v>>(visitor: &mut V,
|
||
|
|
optional_expression: &'v Option<P<Expr>>) {
|
||
|
|
match *optional_expression {
|
||
|
|
None => {}
|
||
|
|
Some(ref expression) => visitor.visit_expr(&**expression),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_exprs<'v, V: Visitor<'v>>(visitor: &mut V, expressions: &'v [P<Expr>]) {
|
||
|
|
for expression in expressions {
|
||
|
|
visitor.visit_expr(&**expression)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr) {
|
||
|
|
match expression.node {
|
||
|
|
ExprBox(ref place, ref subexpression) => {
|
||
|
|
place.as_ref().map(|e|visitor.visit_expr(&**e));
|
||
|
|
visitor.visit_expr(&**subexpression)
|
||
|
|
}
|
||
|
|
ExprVec(ref subexpressions) => {
|
||
|
|
walk_exprs(visitor, subexpressions)
|
||
|
|
}
|
||
|
|
ExprRepeat(ref element, ref count) => {
|
||
|
|
visitor.visit_expr(&**element);
|
||
|
|
visitor.visit_expr(&**count)
|
||
|
|
}
|
||
|
|
ExprStruct(ref path, ref fields, ref optional_base) => {
|
||
|
|
visitor.visit_path(path, expression.id);
|
||
|
|
for field in fields {
|
||
|
|
visitor.visit_expr(&*field.expr)
|
||
|
|
}
|
||
|
|
walk_expr_opt(visitor, optional_base)
|
||
|
|
}
|
||
|
|
ExprTup(ref subexpressions) => {
|
||
|
|
for subexpression in subexpressions {
|
||
|
|
visitor.visit_expr(&**subexpression)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ExprCall(ref callee_expression, ref arguments) => {
|
||
|
|
for argument in arguments {
|
||
|
|
visitor.visit_expr(&**argument)
|
||
|
|
}
|
||
|
|
visitor.visit_expr(&**callee_expression)
|
||
|
|
}
|
||
|
|
ExprMethodCall(_, ref types, ref arguments) => {
|
||
|
|
walk_exprs(visitor, arguments);
|
||
|
|
for typ in types {
|
||
|
|
visitor.visit_ty(&**typ)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ExprBinary(_, ref left_expression, ref right_expression) => {
|
||
|
|
visitor.visit_expr(&**left_expression);
|
||
|
|
visitor.visit_expr(&**right_expression)
|
||
|
|
}
|
||
|
|
ExprAddrOf(_, ref subexpression) | ExprUnary(_, ref subexpression) => {
|
||
|
|
visitor.visit_expr(&**subexpression)
|
||
|
|
}
|
||
|
|
ExprLit(_) => {}
|
||
|
|
ExprCast(ref subexpression, ref typ) => {
|
||
|
|
visitor.visit_expr(&**subexpression);
|
||
|
|
visitor.visit_ty(&**typ)
|
||
|
|
}
|
||
|
|
ExprIf(ref head_expression, ref if_block, ref optional_else) => {
|
||
|
|
visitor.visit_expr(&**head_expression);
|
||
|
|
visitor.visit_block(&**if_block);
|
||
|
|
walk_expr_opt(visitor, optional_else)
|
||
|
|
}
|
||
|
|
ExprWhile(ref subexpression, ref block, _) => {
|
||
|
|
visitor.visit_expr(&**subexpression);
|
||
|
|
visitor.visit_block(&**block)
|
||
|
|
}
|
||
|
|
ExprLoop(ref block, _) => visitor.visit_block(&**block),
|
||
|
|
ExprMatch(ref subexpression, ref arms, _) => {
|
||
|
|
visitor.visit_expr(&**subexpression);
|
||
|
|
for arm in arms {
|
||
|
|
visitor.visit_arm(arm)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ExprClosure(_, ref function_declaration, ref body) => {
|
||
|
|
visitor.visit_fn(FnKind::Closure,
|
||
|
|
&**function_declaration,
|
||
|
|
&**body,
|
||
|
|
expression.span,
|
||
|
|
expression.id)
|
||
|
|
}
|
||
|
|
ExprBlock(ref block) => visitor.visit_block(&**block),
|
||
|
|
ExprAssign(ref left_hand_expression, ref right_hand_expression) => {
|
||
|
|
visitor.visit_expr(&**right_hand_expression);
|
||
|
|
visitor.visit_expr(&**left_hand_expression)
|
||
|
|
}
|
||
|
|
ExprAssignOp(_, ref left_expression, ref right_expression) => {
|
||
|
|
visitor.visit_expr(&**right_expression);
|
||
|
|
visitor.visit_expr(&**left_expression)
|
||
|
|
}
|
||
|
|
ExprField(ref subexpression, _) => {
|
||
|
|
visitor.visit_expr(&**subexpression);
|
||
|
|
}
|
||
|
|
ExprTupField(ref subexpression, _) => {
|
||
|
|
visitor.visit_expr(&**subexpression);
|
||
|
|
}
|
||
|
|
ExprIndex(ref main_expression, ref index_expression) => {
|
||
|
|
visitor.visit_expr(&**main_expression);
|
||
|
|
visitor.visit_expr(&**index_expression)
|
||
|
|
}
|
||
|
|
ExprRange(ref start, ref end) => {
|
||
|
|
walk_expr_opt(visitor, start);
|
||
|
|
walk_expr_opt(visitor, end)
|
||
|
|
}
|
||
|
|
ExprPath(ref maybe_qself, ref path) => {
|
||
|
|
if let Some(ref qself) = *maybe_qself {
|
||
|
|
visitor.visit_ty(&qself.ty);
|
||
|
|
}
|
||
|
|
visitor.visit_path(path, expression.id)
|
||
|
|
}
|
||
|
|
ExprBreak(_) | ExprAgain(_) => {}
|
||
|
|
ExprRet(ref optional_expression) => {
|
||
|
|
walk_expr_opt(visitor, optional_expression)
|
||
|
|
}
|
||
|
|
ExprParen(ref subexpression) => {
|
||
|
|
visitor.visit_expr(&**subexpression)
|
||
|
|
}
|
||
|
|
ExprInlineAsm(ref ia) => {
|
||
|
|
for input in &ia.inputs {
|
||
|
|
let (_, ref input) = *input;
|
||
|
|
visitor.visit_expr(&**input)
|
||
|
|
}
|
||
|
|
for output in &ia.outputs {
|
||
|
|
let (_, ref output, _) = *output;
|
||
|
|
visitor.visit_expr(&**output)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
visitor.visit_expr_post(expression)
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn walk_arm<'v, V: Visitor<'v>>(visitor: &mut V, arm: &'v Arm) {
|
||
|
|
for pattern in &arm.pats {
|
||
|
|
visitor.visit_pat(&**pattern)
|
||
|
|
}
|
||
|
|
walk_expr_opt(visitor, &arm.guard);
|
||
|
|
visitor.visit_expr(&*arm.body);
|
||
|
|
for attr in &arm.attrs {
|
||
|
|
visitor.visit_attribute(attr);
|
||
|
|
}
|
||
|
|
}
|