1413 lines
57 KiB
Rust
1413 lines
57 KiB
Rust
use crate::ast::{self, Block, Ident, LitKind, NodeId, PatKind, Path};
|
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use crate::ast::{MacStmtStyle, StmtKind, ItemKind};
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use crate::attr::{self, HasAttrs};
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use crate::source_map::{dummy_spanned, respan};
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use crate::config::StripUnconfigured;
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use crate::ext::base::*;
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use crate::ext::proc_macro::collect_derives;
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use crate::ext::hygiene::{ExpnId, SyntaxContext, ExpnInfo, ExpnKind};
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use crate::ext::tt::macro_rules::annotate_err_with_kind;
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use crate::ext::placeholders::{placeholder, PlaceholderExpander};
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use crate::feature_gate::{self, Features, GateIssue, is_builtin_attr, emit_feature_err};
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use crate::mut_visit::*;
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use crate::parse::{DirectoryOwnership, PResult, ParseSess};
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use crate::parse::token;
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use crate::parse::parser::Parser;
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use crate::ptr::P;
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use crate::symbol::{sym, Symbol};
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use crate::tokenstream::{TokenStream, TokenTree};
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use crate::visit::{self, Visitor};
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use crate::util::map_in_place::MapInPlace;
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use errors::{Applicability, FatalError};
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use smallvec::{smallvec, SmallVec};
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use syntax_pos::{Span, DUMMY_SP, FileName};
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use rustc_data_structures::fx::FxHashMap;
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use rustc_data_structures::sync::Lrc;
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use std::fs;
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use std::io::ErrorKind;
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use std::{iter, mem};
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use std::ops::DerefMut;
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use std::rc::Rc;
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use std::path::PathBuf;
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macro_rules! ast_fragments {
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(
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$($Kind:ident($AstTy:ty) {
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$kind_name:expr;
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$(one fn $mut_visit_ast:ident; fn $visit_ast:ident;)?
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$(many fn $flat_map_ast_elt:ident; fn $visit_ast_elt:ident;)?
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fn $make_ast:ident;
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})*
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) => {
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/// A fragment of AST that can be produced by a single macro expansion.
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/// Can also serve as an input and intermediate result for macro expansion operations.
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pub enum AstFragment {
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OptExpr(Option<P<ast::Expr>>),
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$($Kind($AstTy),)*
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}
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/// "Discriminant" of an AST fragment.
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub enum AstFragmentKind {
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OptExpr,
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$($Kind,)*
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}
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impl AstFragmentKind {
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pub fn name(self) -> &'static str {
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match self {
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AstFragmentKind::OptExpr => "expression",
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$(AstFragmentKind::$Kind => $kind_name,)*
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}
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}
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fn make_from<'a>(self, result: Box<dyn MacResult + 'a>) -> Option<AstFragment> {
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match self {
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AstFragmentKind::OptExpr =>
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result.make_expr().map(Some).map(AstFragment::OptExpr),
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$(AstFragmentKind::$Kind => result.$make_ast().map(AstFragment::$Kind),)*
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}
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}
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}
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impl AstFragment {
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pub fn make_opt_expr(self) -> Option<P<ast::Expr>> {
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match self {
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AstFragment::OptExpr(expr) => expr,
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_ => panic!("AstFragment::make_* called on the wrong kind of fragment"),
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}
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}
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$(pub fn $make_ast(self) -> $AstTy {
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match self {
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AstFragment::$Kind(ast) => ast,
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_ => panic!("AstFragment::make_* called on the wrong kind of fragment"),
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}
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})*
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pub fn mut_visit_with<F: MutVisitor>(&mut self, vis: &mut F) {
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match self {
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AstFragment::OptExpr(opt_expr) => {
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visit_clobber(opt_expr, |opt_expr| {
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if let Some(expr) = opt_expr {
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vis.filter_map_expr(expr)
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} else {
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None
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}
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});
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}
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$($(AstFragment::$Kind(ast) => vis.$mut_visit_ast(ast),)?)*
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$($(AstFragment::$Kind(ast) =>
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ast.flat_map_in_place(|ast| vis.$flat_map_ast_elt(ast)),)?)*
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}
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}
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pub fn visit_with<'a, V: Visitor<'a>>(&'a self, visitor: &mut V) {
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match *self {
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AstFragment::OptExpr(Some(ref expr)) => visitor.visit_expr(expr),
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AstFragment::OptExpr(None) => {}
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$($(AstFragment::$Kind(ref ast) => visitor.$visit_ast(ast),)?)*
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$($(AstFragment::$Kind(ref ast) => for ast_elt in &ast[..] {
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visitor.$visit_ast_elt(ast_elt);
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})?)*
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}
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}
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}
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impl<'a, 'b> MutVisitor for MacroExpander<'a, 'b> {
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fn filter_map_expr(&mut self, expr: P<ast::Expr>) -> Option<P<ast::Expr>> {
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self.expand_fragment(AstFragment::OptExpr(Some(expr))).make_opt_expr()
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}
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$($(fn $mut_visit_ast(&mut self, ast: &mut $AstTy) {
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visit_clobber(ast, |ast| self.expand_fragment(AstFragment::$Kind(ast)).$make_ast());
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})?)*
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$($(fn $flat_map_ast_elt(&mut self, ast_elt: <$AstTy as IntoIterator>::Item) -> $AstTy {
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self.expand_fragment(AstFragment::$Kind(smallvec![ast_elt])).$make_ast()
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})?)*
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}
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impl<'a> MacResult for crate::ext::tt::macro_rules::ParserAnyMacro<'a> {
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$(fn $make_ast(self: Box<crate::ext::tt::macro_rules::ParserAnyMacro<'a>>)
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-> Option<$AstTy> {
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Some(self.make(AstFragmentKind::$Kind).$make_ast())
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})*
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}
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}
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}
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ast_fragments! {
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Expr(P<ast::Expr>) { "expression"; one fn visit_expr; fn visit_expr; fn make_expr; }
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Pat(P<ast::Pat>) { "pattern"; one fn visit_pat; fn visit_pat; fn make_pat; }
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Ty(P<ast::Ty>) { "type"; one fn visit_ty; fn visit_ty; fn make_ty; }
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Stmts(SmallVec<[ast::Stmt; 1]>) {
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"statement"; many fn flat_map_stmt; fn visit_stmt; fn make_stmts;
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}
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Items(SmallVec<[P<ast::Item>; 1]>) {
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"item"; many fn flat_map_item; fn visit_item; fn make_items;
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}
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TraitItems(SmallVec<[ast::TraitItem; 1]>) {
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"trait item"; many fn flat_map_trait_item; fn visit_trait_item; fn make_trait_items;
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}
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ImplItems(SmallVec<[ast::ImplItem; 1]>) {
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"impl item"; many fn flat_map_impl_item; fn visit_impl_item; fn make_impl_items;
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}
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ForeignItems(SmallVec<[ast::ForeignItem; 1]>) {
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"foreign item"; many fn flat_map_foreign_item; fn visit_foreign_item; fn make_foreign_items;
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}
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}
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impl AstFragmentKind {
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fn dummy(self, span: Span) -> AstFragment {
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self.make_from(DummyResult::any(span)).expect("couldn't create a dummy AST fragment")
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}
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fn expect_from_annotatables<I: IntoIterator<Item = Annotatable>>(self, items: I)
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-> AstFragment {
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let mut items = items.into_iter();
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match self {
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AstFragmentKind::Items =>
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AstFragment::Items(items.map(Annotatable::expect_item).collect()),
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AstFragmentKind::ImplItems =>
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AstFragment::ImplItems(items.map(Annotatable::expect_impl_item).collect()),
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AstFragmentKind::TraitItems =>
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AstFragment::TraitItems(items.map(Annotatable::expect_trait_item).collect()),
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AstFragmentKind::ForeignItems =>
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AstFragment::ForeignItems(items.map(Annotatable::expect_foreign_item).collect()),
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AstFragmentKind::Stmts =>
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AstFragment::Stmts(items.map(Annotatable::expect_stmt).collect()),
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AstFragmentKind::Expr => AstFragment::Expr(
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items.next().expect("expected exactly one expression").expect_expr()
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),
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AstFragmentKind::OptExpr =>
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AstFragment::OptExpr(items.next().map(Annotatable::expect_expr)),
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AstFragmentKind::Pat | AstFragmentKind::Ty =>
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panic!("patterns and types aren't annotatable"),
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}
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}
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}
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pub struct Invocation {
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pub kind: InvocationKind,
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fragment_kind: AstFragmentKind,
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pub expansion_data: ExpansionData,
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}
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pub enum InvocationKind {
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Bang {
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mac: ast::Mac,
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span: Span,
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},
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Attr {
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attr: ast::Attribute,
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item: Annotatable,
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// Required for resolving derive helper attributes.
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derives: Vec<Path>,
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// We temporarily report errors for attribute macros placed after derives
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after_derive: bool,
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},
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Derive {
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path: Path,
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item: Annotatable,
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},
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/// "Invocation" that contains all derives from an item,
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/// broken into multiple `Derive` invocations when expanded.
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/// FIXME: Find a way to remove it.
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DeriveContainer {
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derives: Vec<Path>,
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item: Annotatable,
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},
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}
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impl Invocation {
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pub fn span(&self) -> Span {
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match &self.kind {
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InvocationKind::Bang { span, .. } => *span,
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InvocationKind::Attr { attr, .. } => attr.span,
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InvocationKind::Derive { path, .. } => path.span,
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InvocationKind::DeriveContainer { item, .. } => item.span(),
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}
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}
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}
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pub struct MacroExpander<'a, 'b> {
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pub cx: &'a mut ExtCtxt<'b>,
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monotonic: bool, // cf. `cx.monotonic_expander()`
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}
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impl<'a, 'b> MacroExpander<'a, 'b> {
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pub fn new(cx: &'a mut ExtCtxt<'b>, monotonic: bool) -> Self {
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MacroExpander { cx, monotonic }
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}
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pub fn expand_crate(&mut self, mut krate: ast::Crate) -> ast::Crate {
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let mut module = ModuleData {
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mod_path: vec![Ident::from_str(&self.cx.ecfg.crate_name)],
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directory: match self.cx.source_map().span_to_unmapped_path(krate.span) {
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FileName::Real(path) => path,
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other => PathBuf::from(other.to_string()),
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},
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};
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module.directory.pop();
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self.cx.root_path = module.directory.clone();
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self.cx.current_expansion.module = Rc::new(module);
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let orig_mod_span = krate.module.inner;
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let krate_item = AstFragment::Items(smallvec![P(ast::Item {
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attrs: krate.attrs,
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span: krate.span,
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node: ast::ItemKind::Mod(krate.module),
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ident: Ident::invalid(),
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id: ast::DUMMY_NODE_ID,
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vis: respan(krate.span.shrink_to_lo(), ast::VisibilityKind::Public),
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tokens: None,
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})]);
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match self.expand_fragment(krate_item).make_items().pop().map(P::into_inner) {
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Some(ast::Item { attrs, node: ast::ItemKind::Mod(module), .. }) => {
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krate.attrs = attrs;
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krate.module = module;
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},
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None => {
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// Resolution failed so we return an empty expansion
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krate.attrs = vec![];
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krate.module = ast::Mod {
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inner: orig_mod_span,
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items: vec![],
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inline: true,
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};
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},
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_ => unreachable!(),
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};
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self.cx.trace_macros_diag();
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krate
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}
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// Fully expand all macro invocations in this AST fragment.
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fn expand_fragment(&mut self, input_fragment: AstFragment) -> AstFragment {
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let orig_expansion_data = self.cx.current_expansion.clone();
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self.cx.current_expansion.depth = 0;
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||
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// Collect all macro invocations and replace them with placeholders.
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let (mut fragment_with_placeholders, mut invocations)
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= self.collect_invocations(input_fragment, &[]);
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// Optimization: if we resolve all imports now,
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// we'll be able to immediately resolve most of imported macros.
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self.resolve_imports();
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// Resolve paths in all invocations and produce output expanded fragments for them, but
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// do not insert them into our input AST fragment yet, only store in `expanded_fragments`.
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// The output fragments also go through expansion recursively until no invocations are left.
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// Unresolved macros produce dummy outputs as a recovery measure.
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invocations.reverse();
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let mut expanded_fragments = Vec::new();
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let mut derives: FxHashMap<ExpnId, Vec<_>> = FxHashMap::default();
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||
let mut undetermined_invocations = Vec::new();
|
||
let (mut progress, mut force) = (false, !self.monotonic);
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||
loop {
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let invoc = if let Some(invoc) = invocations.pop() {
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invoc
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||
} else {
|
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self.resolve_imports();
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||
if undetermined_invocations.is_empty() { break }
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||
invocations = mem::take(&mut undetermined_invocations);
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||
force = !mem::replace(&mut progress, false);
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||
continue
|
||
};
|
||
|
||
let scope =
|
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if self.monotonic { invoc.expansion_data.id } else { orig_expansion_data.id };
|
||
let ext = match self.cx.resolver.resolve_macro_invocation(&invoc, scope, force) {
|
||
Ok(ext) => ext,
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Err(Indeterminate) => {
|
||
undetermined_invocations.push(invoc);
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||
continue
|
||
}
|
||
};
|
||
|
||
progress = true;
|
||
let ExpansionData { depth, id: expn_id, .. } = invoc.expansion_data;
|
||
self.cx.current_expansion = invoc.expansion_data.clone();
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||
self.cx.current_expansion.id = scope;
|
||
|
||
// FIXME(jseyfried): Refactor out the following logic
|
||
let (expanded_fragment, new_invocations) = if let Some(ext) = ext {
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||
let fragment = self.expand_invoc(invoc, &ext.kind);
|
||
self.collect_invocations(fragment, &[])
|
||
} else if let InvocationKind::DeriveContainer { derives: traits, item } = invoc.kind {
|
||
if !item.derive_allowed() {
|
||
let attr = attr::find_by_name(item.attrs(), sym::derive)
|
||
.expect("`derive` attribute should exist");
|
||
let span = attr.span;
|
||
let mut err = self.cx.mut_span_err(span,
|
||
"`derive` may only be applied to \
|
||
structs, enums and unions");
|
||
if let ast::AttrStyle::Inner = attr.style {
|
||
let trait_list = traits.iter()
|
||
.map(|t| t.to_string()).collect::<Vec<_>>();
|
||
let suggestion = format!("#[derive({})]", trait_list.join(", "));
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||
err.span_suggestion(
|
||
span, "try an outer attribute", suggestion,
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// We don't 𝑘𝑛𝑜𝑤 that the following item is an ADT
|
||
Applicability::MaybeIncorrect
|
||
);
|
||
}
|
||
err.emit();
|
||
}
|
||
|
||
let mut item = self.fully_configure(item);
|
||
item.visit_attrs(|attrs| attrs.retain(|a| a.path != sym::derive));
|
||
let derives = derives.entry(invoc.expansion_data.id).or_default();
|
||
|
||
derives.reserve(traits.len());
|
||
invocations.reserve(traits.len());
|
||
for path in traits {
|
||
let expn_id = ExpnId::fresh(self.cx.current_expansion.id, None);
|
||
derives.push(expn_id);
|
||
invocations.push(Invocation {
|
||
kind: InvocationKind::Derive { path, item: item.clone() },
|
||
fragment_kind: invoc.fragment_kind,
|
||
expansion_data: ExpansionData {
|
||
id: expn_id,
|
||
..invoc.expansion_data.clone()
|
||
},
|
||
});
|
||
}
|
||
let fragment = invoc.fragment_kind
|
||
.expect_from_annotatables(::std::iter::once(item));
|
||
self.collect_invocations(fragment, derives)
|
||
} else {
|
||
unreachable!()
|
||
};
|
||
|
||
if expanded_fragments.len() < depth {
|
||
expanded_fragments.push(Vec::new());
|
||
}
|
||
expanded_fragments[depth - 1].push((expn_id, expanded_fragment));
|
||
if !self.cx.ecfg.single_step {
|
||
invocations.extend(new_invocations.into_iter().rev());
|
||
}
|
||
}
|
||
|
||
self.cx.current_expansion = orig_expansion_data;
|
||
|
||
// Finally incorporate all the expanded macros into the input AST fragment.
|
||
let mut placeholder_expander = PlaceholderExpander::new(self.cx, self.monotonic);
|
||
while let Some(expanded_fragments) = expanded_fragments.pop() {
|
||
for (mark, expanded_fragment) in expanded_fragments.into_iter().rev() {
|
||
let derives = derives.remove(&mark).unwrap_or_else(Vec::new);
|
||
placeholder_expander.add(NodeId::placeholder_from_expn_id(mark),
|
||
expanded_fragment, derives);
|
||
}
|
||
}
|
||
fragment_with_placeholders.mut_visit_with(&mut placeholder_expander);
|
||
fragment_with_placeholders
|
||
}
|
||
|
||
fn resolve_imports(&mut self) {
|
||
if self.monotonic {
|
||
self.cx.resolver.resolve_imports();
|
||
}
|
||
}
|
||
|
||
/// Collects all macro invocations reachable at this time in this AST fragment, and replace
|
||
/// them with "placeholders" - dummy macro invocations with specially crafted `NodeId`s.
|
||
/// Then call into resolver that builds a skeleton ("reduced graph") of the fragment and
|
||
/// prepares data for resolving paths of macro invocations.
|
||
fn collect_invocations(&mut self, mut fragment: AstFragment, derives: &[ExpnId])
|
||
-> (AstFragment, Vec<Invocation>) {
|
||
// Resolve `$crate`s in the fragment for pretty-printing.
|
||
self.cx.resolver.resolve_dollar_crates();
|
||
|
||
let invocations = {
|
||
let mut collector = InvocationCollector {
|
||
cfg: StripUnconfigured {
|
||
sess: self.cx.parse_sess,
|
||
features: self.cx.ecfg.features,
|
||
},
|
||
cx: self.cx,
|
||
invocations: Vec::new(),
|
||
monotonic: self.monotonic,
|
||
};
|
||
fragment.mut_visit_with(&mut collector);
|
||
collector.invocations
|
||
};
|
||
|
||
if self.monotonic {
|
||
self.cx.resolver.visit_ast_fragment_with_placeholders(
|
||
self.cx.current_expansion.id, &fragment, derives);
|
||
}
|
||
|
||
(fragment, invocations)
|
||
}
|
||
|
||
fn fully_configure(&mut self, item: Annotatable) -> Annotatable {
|
||
let mut cfg = StripUnconfigured {
|
||
sess: self.cx.parse_sess,
|
||
features: self.cx.ecfg.features,
|
||
};
|
||
// Since the item itself has already been configured by the InvocationCollector,
|
||
// we know that fold result vector will contain exactly one element
|
||
match item {
|
||
Annotatable::Item(item) => {
|
||
Annotatable::Item(cfg.flat_map_item(item).pop().unwrap())
|
||
}
|
||
Annotatable::TraitItem(item) => {
|
||
Annotatable::TraitItem(
|
||
item.map(|item| cfg.flat_map_trait_item(item).pop().unwrap()))
|
||
}
|
||
Annotatable::ImplItem(item) => {
|
||
Annotatable::ImplItem(item.map(|item| cfg.flat_map_impl_item(item).pop().unwrap()))
|
||
}
|
||
Annotatable::ForeignItem(item) => {
|
||
Annotatable::ForeignItem(
|
||
item.map(|item| cfg.flat_map_foreign_item(item).pop().unwrap())
|
||
)
|
||
}
|
||
Annotatable::Stmt(stmt) => {
|
||
Annotatable::Stmt(stmt.map(|stmt| cfg.flat_map_stmt(stmt).pop().unwrap()))
|
||
}
|
||
Annotatable::Expr(mut expr) => {
|
||
Annotatable::Expr({ cfg.visit_expr(&mut expr); expr })
|
||
}
|
||
}
|
||
}
|
||
|
||
fn expand_invoc(&mut self, invoc: Invocation, ext: &SyntaxExtensionKind) -> AstFragment {
|
||
let (fragment_kind, span) = (invoc.fragment_kind, invoc.span());
|
||
if fragment_kind == AstFragmentKind::ForeignItems && !self.cx.ecfg.macros_in_extern() {
|
||
if let SyntaxExtensionKind::NonMacroAttr { .. } = ext {} else {
|
||
emit_feature_err(&self.cx.parse_sess, sym::macros_in_extern,
|
||
span, GateIssue::Language,
|
||
"macro invocations in `extern {}` blocks are experimental");
|
||
}
|
||
}
|
||
|
||
if self.cx.current_expansion.depth > self.cx.ecfg.recursion_limit {
|
||
let info = self.cx.current_expansion.id.expn_info().unwrap();
|
||
let suggested_limit = self.cx.ecfg.recursion_limit * 2;
|
||
let mut err = self.cx.struct_span_err(info.call_site,
|
||
&format!("recursion limit reached while expanding the macro `{}`",
|
||
info.kind.descr()));
|
||
err.help(&format!(
|
||
"consider adding a `#![recursion_limit=\"{}\"]` attribute to your crate",
|
||
suggested_limit));
|
||
err.emit();
|
||
self.cx.trace_macros_diag();
|
||
FatalError.raise();
|
||
}
|
||
|
||
match invoc.kind {
|
||
InvocationKind::Bang { mac, .. } => match ext {
|
||
SyntaxExtensionKind::Bang(expander) => {
|
||
self.gate_proc_macro_expansion_kind(span, fragment_kind);
|
||
let tok_result = expander.expand(self.cx, span, mac.node.stream());
|
||
let result =
|
||
self.parse_ast_fragment(tok_result, fragment_kind, &mac.node.path, span);
|
||
self.gate_proc_macro_expansion(span, &result);
|
||
result
|
||
}
|
||
SyntaxExtensionKind::LegacyBang(expander) => {
|
||
let prev = self.cx.current_expansion.prior_type_ascription;
|
||
self.cx.current_expansion.prior_type_ascription =
|
||
mac.node.prior_type_ascription;
|
||
let tok_result = expander.expand(self.cx, span, mac.node.stream());
|
||
let result = if let Some(result) = fragment_kind.make_from(tok_result) {
|
||
result
|
||
} else {
|
||
let msg = format!("non-{kind} macro in {kind} position: {path}",
|
||
kind = fragment_kind.name(), path = mac.node.path);
|
||
self.cx.span_err(span, &msg);
|
||
self.cx.trace_macros_diag();
|
||
fragment_kind.dummy(span)
|
||
};
|
||
self.cx.current_expansion.prior_type_ascription = prev;
|
||
result
|
||
}
|
||
_ => unreachable!()
|
||
}
|
||
InvocationKind::Attr { attr, mut item, .. } => match ext {
|
||
SyntaxExtensionKind::Attr(expander) => {
|
||
self.gate_proc_macro_attr_item(span, &item);
|
||
let item_tok = TokenTree::token(token::Interpolated(Lrc::new(match item {
|
||
Annotatable::Item(item) => token::NtItem(item),
|
||
Annotatable::TraitItem(item) => token::NtTraitItem(item.into_inner()),
|
||
Annotatable::ImplItem(item) => token::NtImplItem(item.into_inner()),
|
||
Annotatable::ForeignItem(item) => token::NtForeignItem(item.into_inner()),
|
||
Annotatable::Stmt(stmt) => token::NtStmt(stmt.into_inner()),
|
||
Annotatable::Expr(expr) => token::NtExpr(expr),
|
||
})), DUMMY_SP).into();
|
||
let input = self.extract_proc_macro_attr_input(attr.tokens, span);
|
||
let tok_result = expander.expand(self.cx, span, input, item_tok);
|
||
let res = self.parse_ast_fragment(tok_result, fragment_kind, &attr.path, span);
|
||
self.gate_proc_macro_expansion(span, &res);
|
||
res
|
||
}
|
||
SyntaxExtensionKind::LegacyAttr(expander) => {
|
||
match attr.parse_meta(self.cx.parse_sess) {
|
||
Ok(meta) => {
|
||
let item = expander.expand(self.cx, span, &meta, item);
|
||
fragment_kind.expect_from_annotatables(item)
|
||
}
|
||
Err(mut err) => {
|
||
err.emit();
|
||
fragment_kind.dummy(span)
|
||
}
|
||
}
|
||
}
|
||
SyntaxExtensionKind::NonMacroAttr { mark_used } => {
|
||
attr::mark_known(&attr);
|
||
if *mark_used {
|
||
attr::mark_used(&attr);
|
||
}
|
||
item.visit_attrs(|attrs| attrs.push(attr));
|
||
fragment_kind.expect_from_annotatables(iter::once(item))
|
||
}
|
||
_ => unreachable!()
|
||
}
|
||
InvocationKind::Derive { path, item } => match ext {
|
||
SyntaxExtensionKind::Derive(expander) |
|
||
SyntaxExtensionKind::LegacyDerive(expander) => {
|
||
if !item.derive_allowed() {
|
||
return fragment_kind.dummy(span);
|
||
}
|
||
let meta = ast::MetaItem { node: ast::MetaItemKind::Word, span, path };
|
||
let span = span.with_ctxt(self.cx.backtrace());
|
||
let items = expander.expand(self.cx, span, &meta, item);
|
||
fragment_kind.expect_from_annotatables(items)
|
||
}
|
||
_ => unreachable!()
|
||
}
|
||
InvocationKind::DeriveContainer { .. } => unreachable!()
|
||
}
|
||
}
|
||
|
||
fn extract_proc_macro_attr_input(&self, tokens: TokenStream, span: Span) -> TokenStream {
|
||
let mut trees = tokens.trees();
|
||
match trees.next() {
|
||
Some(TokenTree::Delimited(_, _, tts)) => {
|
||
if trees.next().is_none() {
|
||
return tts.into()
|
||
}
|
||
}
|
||
Some(TokenTree::Token(..)) => {}
|
||
None => return TokenStream::empty(),
|
||
}
|
||
self.cx.span_err(span, "custom attribute invocations must be \
|
||
of the form `#[foo]` or `#[foo(..)]`, the macro name must only be \
|
||
followed by a delimiter token");
|
||
TokenStream::empty()
|
||
}
|
||
|
||
fn gate_proc_macro_attr_item(&self, span: Span, item: &Annotatable) {
|
||
let (kind, gate) = match *item {
|
||
Annotatable::Item(ref item) => {
|
||
match item.node {
|
||
ItemKind::Mod(_) if self.cx.ecfg.proc_macro_hygiene() => return,
|
||
ItemKind::Mod(_) => ("modules", sym::proc_macro_hygiene),
|
||
_ => return,
|
||
}
|
||
}
|
||
Annotatable::TraitItem(_) => return,
|
||
Annotatable::ImplItem(_) => return,
|
||
Annotatable::ForeignItem(_) => return,
|
||
Annotatable::Stmt(_) |
|
||
Annotatable::Expr(_) if self.cx.ecfg.proc_macro_hygiene() => return,
|
||
Annotatable::Stmt(_) => ("statements", sym::proc_macro_hygiene),
|
||
Annotatable::Expr(_) => ("expressions", sym::proc_macro_hygiene),
|
||
};
|
||
emit_feature_err(
|
||
self.cx.parse_sess,
|
||
gate,
|
||
span,
|
||
GateIssue::Language,
|
||
&format!("custom attributes cannot be applied to {}", kind),
|
||
);
|
||
}
|
||
|
||
fn gate_proc_macro_expansion(&self, span: Span, fragment: &AstFragment) {
|
||
if self.cx.ecfg.proc_macro_hygiene() {
|
||
return
|
||
}
|
||
|
||
fragment.visit_with(&mut DisallowMacros {
|
||
span,
|
||
parse_sess: self.cx.parse_sess,
|
||
});
|
||
|
||
struct DisallowMacros<'a> {
|
||
span: Span,
|
||
parse_sess: &'a ParseSess,
|
||
}
|
||
|
||
impl<'ast, 'a> Visitor<'ast> for DisallowMacros<'a> {
|
||
fn visit_item(&mut self, i: &'ast ast::Item) {
|
||
if let ast::ItemKind::MacroDef(_) = i.node {
|
||
emit_feature_err(
|
||
self.parse_sess,
|
||
sym::proc_macro_hygiene,
|
||
self.span,
|
||
GateIssue::Language,
|
||
"procedural macros cannot expand to macro definitions",
|
||
);
|
||
}
|
||
visit::walk_item(self, i);
|
||
}
|
||
|
||
fn visit_mac(&mut self, _mac: &'ast ast::Mac) {
|
||
// ...
|
||
}
|
||
}
|
||
}
|
||
|
||
fn gate_proc_macro_expansion_kind(&self, span: Span, kind: AstFragmentKind) {
|
||
let kind = match kind {
|
||
AstFragmentKind::Expr => "expressions",
|
||
AstFragmentKind::OptExpr => "expressions",
|
||
AstFragmentKind::Pat => "patterns",
|
||
AstFragmentKind::Ty => "types",
|
||
AstFragmentKind::Stmts => "statements",
|
||
AstFragmentKind::Items => return,
|
||
AstFragmentKind::TraitItems => return,
|
||
AstFragmentKind::ImplItems => return,
|
||
AstFragmentKind::ForeignItems => return,
|
||
};
|
||
if self.cx.ecfg.proc_macro_hygiene() {
|
||
return
|
||
}
|
||
emit_feature_err(
|
||
self.cx.parse_sess,
|
||
sym::proc_macro_hygiene,
|
||
span,
|
||
GateIssue::Language,
|
||
&format!("procedural macros cannot be expanded to {}", kind),
|
||
);
|
||
}
|
||
|
||
fn parse_ast_fragment(
|
||
&mut self,
|
||
toks: TokenStream,
|
||
kind: AstFragmentKind,
|
||
path: &Path,
|
||
span: Span,
|
||
) -> AstFragment {
|
||
let mut parser = self.cx.new_parser_from_tts(&toks.into_trees().collect::<Vec<_>>());
|
||
match parser.parse_ast_fragment(kind, false) {
|
||
Ok(fragment) => {
|
||
parser.ensure_complete_parse(path, kind.name(), span);
|
||
fragment
|
||
}
|
||
Err(mut err) => {
|
||
err.set_span(span);
|
||
annotate_err_with_kind(&mut err, kind, span);
|
||
err.emit();
|
||
self.cx.trace_macros_diag();
|
||
kind.dummy(span)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'a> Parser<'a> {
|
||
pub fn parse_ast_fragment(&mut self, kind: AstFragmentKind, macro_legacy_warnings: bool)
|
||
-> PResult<'a, AstFragment> {
|
||
Ok(match kind {
|
||
AstFragmentKind::Items => {
|
||
let mut items = SmallVec::new();
|
||
while let Some(item) = self.parse_item()? {
|
||
items.push(item);
|
||
}
|
||
AstFragment::Items(items)
|
||
}
|
||
AstFragmentKind::TraitItems => {
|
||
let mut items = SmallVec::new();
|
||
while self.token != token::Eof {
|
||
items.push(self.parse_trait_item(&mut false)?);
|
||
}
|
||
AstFragment::TraitItems(items)
|
||
}
|
||
AstFragmentKind::ImplItems => {
|
||
let mut items = SmallVec::new();
|
||
while self.token != token::Eof {
|
||
items.push(self.parse_impl_item(&mut false)?);
|
||
}
|
||
AstFragment::ImplItems(items)
|
||
}
|
||
AstFragmentKind::ForeignItems => {
|
||
let mut items = SmallVec::new();
|
||
while self.token != token::Eof {
|
||
items.push(self.parse_foreign_item(DUMMY_SP)?);
|
||
}
|
||
AstFragment::ForeignItems(items)
|
||
}
|
||
AstFragmentKind::Stmts => {
|
||
let mut stmts = SmallVec::new();
|
||
while self.token != token::Eof &&
|
||
// won't make progress on a `}`
|
||
self.token != token::CloseDelim(token::Brace) {
|
||
if let Some(stmt) = self.parse_full_stmt(macro_legacy_warnings)? {
|
||
stmts.push(stmt);
|
||
}
|
||
}
|
||
AstFragment::Stmts(stmts)
|
||
}
|
||
AstFragmentKind::Expr => AstFragment::Expr(self.parse_expr()?),
|
||
AstFragmentKind::OptExpr => {
|
||
if self.token != token::Eof {
|
||
AstFragment::OptExpr(Some(self.parse_expr()?))
|
||
} else {
|
||
AstFragment::OptExpr(None)
|
||
}
|
||
},
|
||
AstFragmentKind::Ty => AstFragment::Ty(self.parse_ty()?),
|
||
AstFragmentKind::Pat => AstFragment::Pat(self.parse_pat(None)?),
|
||
})
|
||
}
|
||
|
||
pub fn ensure_complete_parse(&mut self, macro_path: &Path, kind_name: &str, span: Span) {
|
||
if self.token != token::Eof {
|
||
let msg = format!("macro expansion ignores token `{}` and any following",
|
||
self.this_token_to_string());
|
||
// Avoid emitting backtrace info twice.
|
||
let def_site_span = self.token.span.with_ctxt(SyntaxContext::empty());
|
||
let mut err = self.diagnostic().struct_span_err(def_site_span, &msg);
|
||
err.span_label(span, "caused by the macro expansion here");
|
||
let msg = format!(
|
||
"the usage of `{}!` is likely invalid in {} context",
|
||
macro_path,
|
||
kind_name,
|
||
);
|
||
err.note(&msg);
|
||
let semi_span = self.sess.source_map().next_point(span);
|
||
|
||
let semi_full_span = semi_span.to(self.sess.source_map().next_point(semi_span));
|
||
match self.sess.source_map().span_to_snippet(semi_full_span) {
|
||
Ok(ref snippet) if &snippet[..] != ";" && kind_name == "expression" => {
|
||
err.span_suggestion(
|
||
semi_span,
|
||
"you might be missing a semicolon here",
|
||
";".to_owned(),
|
||
Applicability::MaybeIncorrect,
|
||
);
|
||
}
|
||
_ => {}
|
||
}
|
||
err.emit();
|
||
}
|
||
}
|
||
}
|
||
|
||
struct InvocationCollector<'a, 'b> {
|
||
cx: &'a mut ExtCtxt<'b>,
|
||
cfg: StripUnconfigured<'a>,
|
||
invocations: Vec<Invocation>,
|
||
monotonic: bool,
|
||
}
|
||
|
||
impl<'a, 'b> InvocationCollector<'a, 'b> {
|
||
fn collect(&mut self, fragment_kind: AstFragmentKind, kind: InvocationKind) -> AstFragment {
|
||
// Expansion info for all the collected invocations is set upon their resolution,
|
||
// with exception of the derive container case which is not resolved and can get
|
||
// its expansion info immediately.
|
||
let expn_info = match &kind {
|
||
InvocationKind::DeriveContainer { item, .. } => Some(ExpnInfo::default(
|
||
ExpnKind::Macro(MacroKind::Attr, sym::derive),
|
||
item.span(), self.cx.parse_sess.edition,
|
||
)),
|
||
_ => None,
|
||
};
|
||
let expn_id = ExpnId::fresh(self.cx.current_expansion.id, expn_info);
|
||
self.invocations.push(Invocation {
|
||
kind,
|
||
fragment_kind,
|
||
expansion_data: ExpansionData {
|
||
id: expn_id,
|
||
depth: self.cx.current_expansion.depth + 1,
|
||
..self.cx.current_expansion.clone()
|
||
},
|
||
});
|
||
placeholder(fragment_kind, NodeId::placeholder_from_expn_id(expn_id))
|
||
}
|
||
|
||
fn collect_bang(&mut self, mac: ast::Mac, span: Span, kind: AstFragmentKind) -> AstFragment {
|
||
self.collect(kind, InvocationKind::Bang { mac, span })
|
||
}
|
||
|
||
fn collect_attr(&mut self,
|
||
attr: Option<ast::Attribute>,
|
||
derives: Vec<Path>,
|
||
item: Annotatable,
|
||
kind: AstFragmentKind,
|
||
after_derive: bool)
|
||
-> AstFragment {
|
||
self.collect(kind, match attr {
|
||
Some(attr) => InvocationKind::Attr { attr, item, derives, after_derive },
|
||
None => InvocationKind::DeriveContainer { derives, item },
|
||
})
|
||
}
|
||
|
||
fn find_attr_invoc(&self, attrs: &mut Vec<ast::Attribute>, after_derive: &mut bool)
|
||
-> Option<ast::Attribute> {
|
||
let attr = attrs.iter()
|
||
.position(|a| {
|
||
if a.path == sym::derive {
|
||
*after_derive = true;
|
||
}
|
||
!attr::is_known(a) && !is_builtin_attr(a)
|
||
})
|
||
.map(|i| attrs.remove(i));
|
||
if let Some(attr) = &attr {
|
||
if !self.cx.ecfg.custom_inner_attributes() &&
|
||
attr.style == ast::AttrStyle::Inner && attr.path != sym::test {
|
||
emit_feature_err(&self.cx.parse_sess, sym::custom_inner_attributes,
|
||
attr.span, GateIssue::Language,
|
||
"non-builtin inner attributes are unstable");
|
||
}
|
||
}
|
||
attr
|
||
}
|
||
|
||
/// If `item` is an attr invocation, remove and return the macro attribute and derive traits.
|
||
fn classify_item<T>(&mut self, item: &mut T)
|
||
-> (Option<ast::Attribute>, Vec<Path>, /* after_derive */ bool)
|
||
where T: HasAttrs,
|
||
{
|
||
let (mut attr, mut traits, mut after_derive) = (None, Vec::new(), false);
|
||
|
||
item.visit_attrs(|mut attrs| {
|
||
attr = self.find_attr_invoc(&mut attrs, &mut after_derive);
|
||
traits = collect_derives(&mut self.cx, &mut attrs);
|
||
});
|
||
|
||
(attr, traits, after_derive)
|
||
}
|
||
|
||
/// Alternative to `classify_item()` that ignores `#[derive]` so invocations fallthrough
|
||
/// to the unused-attributes lint (making it an error on statements and expressions
|
||
/// is a breaking change)
|
||
fn classify_nonitem<T: HasAttrs>(&mut self, nonitem: &mut T)
|
||
-> (Option<ast::Attribute>, /* after_derive */ bool) {
|
||
let (mut attr, mut after_derive) = (None, false);
|
||
|
||
nonitem.visit_attrs(|mut attrs| {
|
||
attr = self.find_attr_invoc(&mut attrs, &mut after_derive);
|
||
});
|
||
|
||
(attr, after_derive)
|
||
}
|
||
|
||
fn configure<T: HasAttrs>(&mut self, node: T) -> Option<T> {
|
||
self.cfg.configure(node)
|
||
}
|
||
|
||
// Detect use of feature-gated or invalid attributes on macro invocations
|
||
// since they will not be detected after macro expansion.
|
||
fn check_attributes(&mut self, attrs: &[ast::Attribute]) {
|
||
let features = self.cx.ecfg.features.unwrap();
|
||
for attr in attrs.iter() {
|
||
self.check_attribute_inner(attr, features);
|
||
|
||
// macros are expanded before any lint passes so this warning has to be hardcoded
|
||
if attr.path == sym::derive {
|
||
self.cx.struct_span_warn(attr.span, "`#[derive]` does nothing on macro invocations")
|
||
.note("this may become a hard error in a future release")
|
||
.emit();
|
||
}
|
||
}
|
||
}
|
||
|
||
fn check_attribute(&mut self, at: &ast::Attribute) {
|
||
let features = self.cx.ecfg.features.unwrap();
|
||
self.check_attribute_inner(at, features);
|
||
}
|
||
|
||
fn check_attribute_inner(&mut self, at: &ast::Attribute, features: &Features) {
|
||
feature_gate::check_attribute(at, self.cx.parse_sess, features);
|
||
}
|
||
}
|
||
|
||
impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
|
||
fn visit_expr(&mut self, expr: &mut P<ast::Expr>) {
|
||
self.cfg.configure_expr(expr);
|
||
visit_clobber(expr.deref_mut(), |mut expr| {
|
||
self.cfg.configure_expr_kind(&mut expr.node);
|
||
|
||
// ignore derives so they remain unused
|
||
let (attr, after_derive) = self.classify_nonitem(&mut expr);
|
||
|
||
if attr.is_some() {
|
||
// Collect the invoc regardless of whether or not attributes are permitted here
|
||
// expansion will eat the attribute so it won't error later.
|
||
attr.as_ref().map(|a| self.cfg.maybe_emit_expr_attr_err(a));
|
||
|
||
// AstFragmentKind::Expr requires the macro to emit an expression.
|
||
return self.collect_attr(attr, vec![], Annotatable::Expr(P(expr)),
|
||
AstFragmentKind::Expr, after_derive)
|
||
.make_expr()
|
||
.into_inner()
|
||
}
|
||
|
||
if let ast::ExprKind::Mac(mac) = expr.node {
|
||
self.check_attributes(&expr.attrs);
|
||
self.collect_bang(mac, expr.span, AstFragmentKind::Expr)
|
||
.make_expr()
|
||
.into_inner()
|
||
} else {
|
||
noop_visit_expr(&mut expr, self);
|
||
expr
|
||
}
|
||
});
|
||
}
|
||
|
||
fn filter_map_expr(&mut self, expr: P<ast::Expr>) -> Option<P<ast::Expr>> {
|
||
let expr = configure!(self, expr);
|
||
expr.filter_map(|mut expr| {
|
||
self.cfg.configure_expr_kind(&mut expr.node);
|
||
|
||
// Ignore derives so they remain unused.
|
||
let (attr, after_derive) = self.classify_nonitem(&mut expr);
|
||
|
||
if attr.is_some() {
|
||
attr.as_ref().map(|a| self.cfg.maybe_emit_expr_attr_err(a));
|
||
|
||
return self.collect_attr(attr, vec![], Annotatable::Expr(P(expr)),
|
||
AstFragmentKind::OptExpr, after_derive)
|
||
.make_opt_expr()
|
||
.map(|expr| expr.into_inner())
|
||
}
|
||
|
||
if let ast::ExprKind::Mac(mac) = expr.node {
|
||
self.check_attributes(&expr.attrs);
|
||
self.collect_bang(mac, expr.span, AstFragmentKind::OptExpr)
|
||
.make_opt_expr()
|
||
.map(|expr| expr.into_inner())
|
||
} else {
|
||
Some({ noop_visit_expr(&mut expr, self); expr })
|
||
}
|
||
})
|
||
}
|
||
|
||
fn visit_pat(&mut self, pat: &mut P<ast::Pat>) {
|
||
self.cfg.configure_pat(pat);
|
||
match pat.node {
|
||
PatKind::Mac(_) => {}
|
||
_ => return noop_visit_pat(pat, self),
|
||
}
|
||
|
||
visit_clobber(pat, |mut pat| {
|
||
match mem::replace(&mut pat.node, PatKind::Wild) {
|
||
PatKind::Mac(mac) =>
|
||
self.collect_bang(mac, pat.span, AstFragmentKind::Pat).make_pat(),
|
||
_ => unreachable!(),
|
||
}
|
||
});
|
||
}
|
||
|
||
fn flat_map_stmt(&mut self, stmt: ast::Stmt) -> SmallVec<[ast::Stmt; 1]> {
|
||
let mut stmt = configure!(self, stmt);
|
||
|
||
// we'll expand attributes on expressions separately
|
||
if !stmt.is_expr() {
|
||
let (attr, derives, after_derive) = if stmt.is_item() {
|
||
self.classify_item(&mut stmt)
|
||
} else {
|
||
// ignore derives on non-item statements so it falls through
|
||
// to the unused-attributes lint
|
||
let (attr, after_derive) = self.classify_nonitem(&mut stmt);
|
||
(attr, vec![], after_derive)
|
||
};
|
||
|
||
if attr.is_some() || !derives.is_empty() {
|
||
return self.collect_attr(attr, derives, Annotatable::Stmt(P(stmt)),
|
||
AstFragmentKind::Stmts, after_derive).make_stmts();
|
||
}
|
||
}
|
||
|
||
if let StmtKind::Mac(mac) = stmt.node {
|
||
let (mac, style, attrs) = mac.into_inner();
|
||
self.check_attributes(&attrs);
|
||
let mut placeholder = self.collect_bang(mac, stmt.span, AstFragmentKind::Stmts)
|
||
.make_stmts();
|
||
|
||
// If this is a macro invocation with a semicolon, then apply that
|
||
// semicolon to the final statement produced by expansion.
|
||
if style == MacStmtStyle::Semicolon {
|
||
if let Some(stmt) = placeholder.pop() {
|
||
placeholder.push(stmt.add_trailing_semicolon());
|
||
}
|
||
}
|
||
|
||
return placeholder;
|
||
}
|
||
|
||
// The placeholder expander gives ids to statements, so we avoid folding the id here.
|
||
let ast::Stmt { id, node, span } = stmt;
|
||
noop_flat_map_stmt_kind(node, self).into_iter().map(|node| {
|
||
ast::Stmt { id, node, span }
|
||
}).collect()
|
||
|
||
}
|
||
|
||
fn visit_block(&mut self, block: &mut P<Block>) {
|
||
let old_directory_ownership = self.cx.current_expansion.directory_ownership;
|
||
self.cx.current_expansion.directory_ownership = DirectoryOwnership::UnownedViaBlock;
|
||
noop_visit_block(block, self);
|
||
self.cx.current_expansion.directory_ownership = old_directory_ownership;
|
||
}
|
||
|
||
fn flat_map_item(&mut self, item: P<ast::Item>) -> SmallVec<[P<ast::Item>; 1]> {
|
||
let mut item = configure!(self, item);
|
||
|
||
let (attr, traits, after_derive) = self.classify_item(&mut item);
|
||
if attr.is_some() || !traits.is_empty() {
|
||
return self.collect_attr(attr, traits, Annotatable::Item(item),
|
||
AstFragmentKind::Items, after_derive).make_items();
|
||
}
|
||
|
||
match item.node {
|
||
ast::ItemKind::Mac(..) => {
|
||
self.check_attributes(&item.attrs);
|
||
item.and_then(|item| match item.node {
|
||
ItemKind::Mac(mac) => self.collect(
|
||
AstFragmentKind::Items, InvocationKind::Bang { mac, span: item.span }
|
||
).make_items(),
|
||
_ => unreachable!(),
|
||
})
|
||
}
|
||
ast::ItemKind::Mod(ast::Mod { inner, .. }) => {
|
||
if item.ident == Ident::invalid() {
|
||
return noop_flat_map_item(item, self);
|
||
}
|
||
|
||
let orig_directory_ownership = self.cx.current_expansion.directory_ownership;
|
||
let mut module = (*self.cx.current_expansion.module).clone();
|
||
module.mod_path.push(item.ident);
|
||
|
||
// Detect if this is an inline module (`mod m { ... }` as opposed to `mod m;`).
|
||
// In the non-inline case, `inner` is never the dummy span (cf. `parse_item_mod`).
|
||
// Thus, if `inner` is the dummy span, we know the module is inline.
|
||
let inline_module = item.span.contains(inner) || inner.is_dummy();
|
||
|
||
if inline_module {
|
||
if let Some(path) = attr::first_attr_value_str_by_name(&item.attrs, sym::path) {
|
||
self.cx.current_expansion.directory_ownership =
|
||
DirectoryOwnership::Owned { relative: None };
|
||
module.directory.push(&*path.as_str());
|
||
} else {
|
||
module.directory.push(&*item.ident.as_str());
|
||
}
|
||
} else {
|
||
let path = self.cx.parse_sess.source_map().span_to_unmapped_path(inner);
|
||
let mut path = match path {
|
||
FileName::Real(path) => path,
|
||
other => PathBuf::from(other.to_string()),
|
||
};
|
||
let directory_ownership = match path.file_name().unwrap().to_str() {
|
||
Some("mod.rs") => DirectoryOwnership::Owned { relative: None },
|
||
Some(_) => DirectoryOwnership::Owned {
|
||
relative: Some(item.ident),
|
||
},
|
||
None => DirectoryOwnership::UnownedViaMod(false),
|
||
};
|
||
path.pop();
|
||
module.directory = path;
|
||
self.cx.current_expansion.directory_ownership = directory_ownership;
|
||
}
|
||
|
||
let orig_module =
|
||
mem::replace(&mut self.cx.current_expansion.module, Rc::new(module));
|
||
let result = noop_flat_map_item(item, self);
|
||
self.cx.current_expansion.module = orig_module;
|
||
self.cx.current_expansion.directory_ownership = orig_directory_ownership;
|
||
result
|
||
}
|
||
|
||
_ => noop_flat_map_item(item, self),
|
||
}
|
||
}
|
||
|
||
fn flat_map_trait_item(&mut self, item: ast::TraitItem) -> SmallVec<[ast::TraitItem; 1]> {
|
||
let mut item = configure!(self, item);
|
||
|
||
let (attr, traits, after_derive) = self.classify_item(&mut item);
|
||
if attr.is_some() || !traits.is_empty() {
|
||
return self.collect_attr(attr, traits, Annotatable::TraitItem(P(item)),
|
||
AstFragmentKind::TraitItems, after_derive).make_trait_items()
|
||
}
|
||
|
||
match item.node {
|
||
ast::TraitItemKind::Macro(mac) => {
|
||
let ast::TraitItem { attrs, span, .. } = item;
|
||
self.check_attributes(&attrs);
|
||
self.collect_bang(mac, span, AstFragmentKind::TraitItems).make_trait_items()
|
||
}
|
||
_ => noop_flat_map_trait_item(item, self),
|
||
}
|
||
}
|
||
|
||
fn flat_map_impl_item(&mut self, item: ast::ImplItem) -> SmallVec<[ast::ImplItem; 1]> {
|
||
let mut item = configure!(self, item);
|
||
|
||
let (attr, traits, after_derive) = self.classify_item(&mut item);
|
||
if attr.is_some() || !traits.is_empty() {
|
||
return self.collect_attr(attr, traits, Annotatable::ImplItem(P(item)),
|
||
AstFragmentKind::ImplItems, after_derive).make_impl_items();
|
||
}
|
||
|
||
match item.node {
|
||
ast::ImplItemKind::Macro(mac) => {
|
||
let ast::ImplItem { attrs, span, .. } = item;
|
||
self.check_attributes(&attrs);
|
||
self.collect_bang(mac, span, AstFragmentKind::ImplItems).make_impl_items()
|
||
}
|
||
_ => noop_flat_map_impl_item(item, self),
|
||
}
|
||
}
|
||
|
||
fn visit_ty(&mut self, ty: &mut P<ast::Ty>) {
|
||
match ty.node {
|
||
ast::TyKind::Mac(_) => {}
|
||
_ => return noop_visit_ty(ty, self),
|
||
};
|
||
|
||
visit_clobber(ty, |mut ty| {
|
||
match mem::replace(&mut ty.node, ast::TyKind::Err) {
|
||
ast::TyKind::Mac(mac) =>
|
||
self.collect_bang(mac, ty.span, AstFragmentKind::Ty).make_ty(),
|
||
_ => unreachable!(),
|
||
}
|
||
});
|
||
}
|
||
|
||
fn visit_foreign_mod(&mut self, foreign_mod: &mut ast::ForeignMod) {
|
||
self.cfg.configure_foreign_mod(foreign_mod);
|
||
noop_visit_foreign_mod(foreign_mod, self);
|
||
}
|
||
|
||
fn flat_map_foreign_item(&mut self, mut foreign_item: ast::ForeignItem)
|
||
-> SmallVec<[ast::ForeignItem; 1]>
|
||
{
|
||
let (attr, traits, after_derive) = self.classify_item(&mut foreign_item);
|
||
|
||
if attr.is_some() || !traits.is_empty() {
|
||
return self.collect_attr(attr, traits, Annotatable::ForeignItem(P(foreign_item)),
|
||
AstFragmentKind::ForeignItems, after_derive)
|
||
.make_foreign_items();
|
||
}
|
||
|
||
if let ast::ForeignItemKind::Macro(mac) = foreign_item.node {
|
||
self.check_attributes(&foreign_item.attrs);
|
||
return self.collect_bang(mac, foreign_item.span, AstFragmentKind::ForeignItems)
|
||
.make_foreign_items();
|
||
}
|
||
|
||
noop_flat_map_foreign_item(foreign_item, self)
|
||
}
|
||
|
||
fn visit_item_kind(&mut self, item: &mut ast::ItemKind) {
|
||
match item {
|
||
ast::ItemKind::MacroDef(..) => {}
|
||
_ => {
|
||
self.cfg.configure_item_kind(item);
|
||
noop_visit_item_kind(item, self);
|
||
}
|
||
}
|
||
}
|
||
|
||
fn visit_generic_params(&mut self, params: &mut Vec<ast::GenericParam>) {
|
||
self.cfg.configure_generic_params(params);
|
||
noop_visit_generic_params(params, self);
|
||
}
|
||
|
||
fn visit_attribute(&mut self, at: &mut ast::Attribute) {
|
||
// turn `#[doc(include="filename")]` attributes into `#[doc(include(file="filename",
|
||
// contents="file contents")]` attributes
|
||
if !at.check_name(sym::doc) {
|
||
return noop_visit_attribute(at, self);
|
||
}
|
||
|
||
if let Some(list) = at.meta_item_list() {
|
||
if !list.iter().any(|it| it.check_name(sym::include)) {
|
||
return noop_visit_attribute(at, self);
|
||
}
|
||
|
||
let mut items = vec![];
|
||
|
||
for mut it in list {
|
||
if !it.check_name(sym::include) {
|
||
items.push({ noop_visit_meta_list_item(&mut it, self); it });
|
||
continue;
|
||
}
|
||
|
||
if let Some(file) = it.value_str() {
|
||
let err_count = self.cx.parse_sess.span_diagnostic.err_count();
|
||
self.check_attribute(&at);
|
||
if self.cx.parse_sess.span_diagnostic.err_count() > err_count {
|
||
// avoid loading the file if they haven't enabled the feature
|
||
return noop_visit_attribute(at, self);
|
||
}
|
||
|
||
let filename = self.cx.resolve_path(&*file.as_str(), it.span());
|
||
match fs::read_to_string(&filename) {
|
||
Ok(src) => {
|
||
let src_interned = Symbol::intern(&src);
|
||
|
||
// Add this input file to the code map to make it available as
|
||
// dependency information
|
||
self.cx.source_map().new_source_file(filename.into(), src);
|
||
|
||
let include_info = vec![
|
||
ast::NestedMetaItem::MetaItem(
|
||
attr::mk_name_value_item_str(
|
||
Ident::with_empty_ctxt(sym::file),
|
||
dummy_spanned(file),
|
||
),
|
||
),
|
||
ast::NestedMetaItem::MetaItem(
|
||
attr::mk_name_value_item_str(
|
||
Ident::with_empty_ctxt(sym::contents),
|
||
dummy_spanned(src_interned),
|
||
),
|
||
),
|
||
];
|
||
|
||
let include_ident = Ident::with_empty_ctxt(sym::include);
|
||
let item = attr::mk_list_item(include_ident, include_info);
|
||
items.push(ast::NestedMetaItem::MetaItem(item));
|
||
}
|
||
Err(e) => {
|
||
let lit = it
|
||
.meta_item()
|
||
.and_then(|item| item.name_value_literal())
|
||
.unwrap();
|
||
|
||
if e.kind() == ErrorKind::InvalidData {
|
||
self.cx
|
||
.struct_span_err(
|
||
lit.span,
|
||
&format!("{} wasn't a utf-8 file", filename.display()),
|
||
)
|
||
.span_label(lit.span, "contains invalid utf-8")
|
||
.emit();
|
||
} else {
|
||
let mut err = self.cx.struct_span_err(
|
||
lit.span,
|
||
&format!("couldn't read {}: {}", filename.display(), e),
|
||
);
|
||
err.span_label(lit.span, "couldn't read file");
|
||
|
||
err.emit();
|
||
}
|
||
}
|
||
}
|
||
} else {
|
||
let mut err = self.cx.struct_span_err(
|
||
it.span(),
|
||
&format!("expected path to external documentation"),
|
||
);
|
||
|
||
// Check if the user erroneously used `doc(include(...))` syntax.
|
||
let literal = it.meta_item_list().and_then(|list| {
|
||
if list.len() == 1 {
|
||
list[0].literal().map(|literal| &literal.node)
|
||
} else {
|
||
None
|
||
}
|
||
});
|
||
|
||
let (path, applicability) = match &literal {
|
||
Some(LitKind::Str(path, ..)) => {
|
||
(path.to_string(), Applicability::MachineApplicable)
|
||
}
|
||
_ => (String::from("<path>"), Applicability::HasPlaceholders),
|
||
};
|
||
|
||
err.span_suggestion(
|
||
it.span(),
|
||
"provide a file path with `=`",
|
||
format!("include = \"{}\"", path),
|
||
applicability,
|
||
);
|
||
|
||
err.emit();
|
||
}
|
||
}
|
||
|
||
let meta = attr::mk_list_item(Ident::with_empty_ctxt(sym::doc), items);
|
||
*at = attr::Attribute {
|
||
span: at.span,
|
||
id: at.id,
|
||
style: at.style,
|
||
path: meta.path,
|
||
tokens: meta.node.tokens(meta.span),
|
||
is_sugared_doc: false,
|
||
};
|
||
} else {
|
||
noop_visit_attribute(at, self)
|
||
}
|
||
}
|
||
|
||
fn visit_id(&mut self, id: &mut ast::NodeId) {
|
||
if self.monotonic {
|
||
debug_assert_eq!(*id, ast::DUMMY_NODE_ID);
|
||
*id = self.cx.resolver.next_node_id()
|
||
}
|
||
}
|
||
|
||
fn visit_fn_decl(&mut self, mut fn_decl: &mut P<ast::FnDecl>) {
|
||
self.cfg.configure_fn_decl(&mut fn_decl);
|
||
noop_visit_fn_decl(fn_decl, self);
|
||
}
|
||
}
|
||
|
||
pub struct ExpansionConfig<'feat> {
|
||
pub crate_name: String,
|
||
pub features: Option<&'feat Features>,
|
||
pub recursion_limit: usize,
|
||
pub trace_mac: bool,
|
||
pub should_test: bool, // If false, strip `#[test]` nodes
|
||
pub single_step: bool,
|
||
pub keep_macs: bool,
|
||
}
|
||
|
||
impl<'feat> ExpansionConfig<'feat> {
|
||
pub fn default(crate_name: String) -> ExpansionConfig<'static> {
|
||
ExpansionConfig {
|
||
crate_name,
|
||
features: None,
|
||
recursion_limit: 1024,
|
||
trace_mac: false,
|
||
should_test: false,
|
||
single_step: false,
|
||
keep_macs: false,
|
||
}
|
||
}
|
||
|
||
fn macros_in_extern(&self) -> bool {
|
||
self.features.map_or(false, |features| features.macros_in_extern)
|
||
}
|
||
fn proc_macro_hygiene(&self) -> bool {
|
||
self.features.map_or(false, |features| features.proc_macro_hygiene)
|
||
}
|
||
fn custom_inner_attributes(&self) -> bool {
|
||
self.features.map_or(false, |features| features.custom_inner_attributes)
|
||
}
|
||
}
|
||
|
||
// A Marker adds the given mark to the syntax context.
|
||
#[derive(Debug)]
|
||
pub struct Marker(pub ExpnId);
|
||
|
||
impl MutVisitor for Marker {
|
||
fn visit_span(&mut self, span: &mut Span) {
|
||
*span = span.apply_mark(self.0)
|
||
}
|
||
|
||
fn visit_mac(&mut self, mac: &mut ast::Mac) {
|
||
noop_visit_mac(mac, self)
|
||
}
|
||
}
|