mv compiler to compiler/
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mark
Vadim Petrochenkov
parent
db534b3ac2
commit
9e5f7d5631
1686 changed files with 941 additions and 1051 deletions
304
compiler/rustc_parse/src/parser/attr.rs
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304
compiler/rustc_parse/src/parser/attr.rs
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@ -0,0 +1,304 @@
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use super::{Parser, PathStyle};
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use rustc_ast as ast;
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use rustc_ast::attr;
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use rustc_ast::token::{self, Nonterminal};
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use rustc_ast_pretty::pprust;
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use rustc_errors::{error_code, PResult};
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use rustc_span::Span;
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use tracing::debug;
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#[derive(Debug)]
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pub(super) enum InnerAttrPolicy<'a> {
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Permitted,
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Forbidden { reason: &'a str, saw_doc_comment: bool, prev_attr_sp: Option<Span> },
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}
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const DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG: &str = "an inner attribute is not \
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permitted in this context";
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pub(super) const DEFAULT_INNER_ATTR_FORBIDDEN: InnerAttrPolicy<'_> = InnerAttrPolicy::Forbidden {
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reason: DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG,
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saw_doc_comment: false,
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prev_attr_sp: None,
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};
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impl<'a> Parser<'a> {
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/// Parses attributes that appear before an item.
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pub(super) fn parse_outer_attributes(&mut self) -> PResult<'a, Vec<ast::Attribute>> {
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let mut attrs: Vec<ast::Attribute> = Vec::new();
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let mut just_parsed_doc_comment = false;
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loop {
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debug!("parse_outer_attributes: self.token={:?}", self.token);
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if self.check(&token::Pound) {
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let inner_error_reason = if just_parsed_doc_comment {
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"an inner attribute is not permitted following an outer doc comment"
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} else if !attrs.is_empty() {
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"an inner attribute is not permitted following an outer attribute"
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} else {
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DEFAULT_UNEXPECTED_INNER_ATTR_ERR_MSG
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};
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let inner_parse_policy = InnerAttrPolicy::Forbidden {
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reason: inner_error_reason,
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saw_doc_comment: just_parsed_doc_comment,
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prev_attr_sp: attrs.last().map(|a| a.span),
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};
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let attr = self.parse_attribute_with_inner_parse_policy(inner_parse_policy)?;
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attrs.push(attr);
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just_parsed_doc_comment = false;
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} else if let token::DocComment(comment_kind, attr_style, data) = self.token.kind {
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let attr = attr::mk_doc_comment(comment_kind, attr_style, data, self.token.span);
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if attr.style != ast::AttrStyle::Outer {
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self.sess
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.span_diagnostic
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.struct_span_err_with_code(
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self.token.span,
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"expected outer doc comment",
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error_code!(E0753),
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)
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.note(
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"inner doc comments like this (starting with \
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`//!` or `/*!`) can only appear before items",
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)
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.emit();
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}
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attrs.push(attr);
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self.bump();
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just_parsed_doc_comment = true;
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} else {
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break;
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}
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}
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Ok(attrs)
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}
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/// Matches `attribute = # ! [ meta_item ]`.
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///
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/// If `permit_inner` is `true`, then a leading `!` indicates an inner
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/// attribute.
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pub fn parse_attribute(&mut self, permit_inner: bool) -> PResult<'a, ast::Attribute> {
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debug!("parse_attribute: permit_inner={:?} self.token={:?}", permit_inner, self.token);
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let inner_parse_policy =
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if permit_inner { InnerAttrPolicy::Permitted } else { DEFAULT_INNER_ATTR_FORBIDDEN };
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self.parse_attribute_with_inner_parse_policy(inner_parse_policy)
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}
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/// The same as `parse_attribute`, except it takes in an `InnerAttrPolicy`
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/// that prescribes how to handle inner attributes.
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fn parse_attribute_with_inner_parse_policy(
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&mut self,
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inner_parse_policy: InnerAttrPolicy<'_>,
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) -> PResult<'a, ast::Attribute> {
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debug!(
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"parse_attribute_with_inner_parse_policy: inner_parse_policy={:?} self.token={:?}",
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inner_parse_policy, self.token
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);
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let lo = self.token.span;
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let (span, item, style) = if self.eat(&token::Pound) {
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let style =
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if self.eat(&token::Not) { ast::AttrStyle::Inner } else { ast::AttrStyle::Outer };
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self.expect(&token::OpenDelim(token::Bracket))?;
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let item = self.parse_attr_item()?;
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self.expect(&token::CloseDelim(token::Bracket))?;
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let attr_sp = lo.to(self.prev_token.span);
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// Emit error if inner attribute is encountered and forbidden.
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if style == ast::AttrStyle::Inner {
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self.error_on_forbidden_inner_attr(attr_sp, inner_parse_policy);
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}
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(attr_sp, item, style)
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} else {
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let token_str = pprust::token_to_string(&self.token);
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let msg = &format!("expected `#`, found `{}`", token_str);
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return Err(self.struct_span_err(self.token.span, msg));
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};
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Ok(attr::mk_attr_from_item(style, item, span))
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}
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pub(super) fn error_on_forbidden_inner_attr(&self, attr_sp: Span, policy: InnerAttrPolicy<'_>) {
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if let InnerAttrPolicy::Forbidden { reason, saw_doc_comment, prev_attr_sp } = policy {
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let prev_attr_note =
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if saw_doc_comment { "previous doc comment" } else { "previous outer attribute" };
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let mut diag = self.struct_span_err(attr_sp, reason);
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if let Some(prev_attr_sp) = prev_attr_sp {
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diag.span_label(attr_sp, "not permitted following an outer attribute")
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.span_label(prev_attr_sp, prev_attr_note);
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}
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diag.note(
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"inner attributes, like `#![no_std]`, annotate the item enclosing them, \
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and are usually found at the beginning of source files. \
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Outer attributes, like `#[test]`, annotate the item following them.",
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)
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.emit();
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}
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}
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/// Parses an inner part of an attribute (the path and following tokens).
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/// The tokens must be either a delimited token stream, or empty token stream,
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/// or the "legacy" key-value form.
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/// PATH `(` TOKEN_STREAM `)`
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/// PATH `[` TOKEN_STREAM `]`
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/// PATH `{` TOKEN_STREAM `}`
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/// PATH
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/// PATH `=` UNSUFFIXED_LIT
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/// The delimiters or `=` are still put into the resulting token stream.
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pub fn parse_attr_item(&mut self) -> PResult<'a, ast::AttrItem> {
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let item = match self.token.kind {
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token::Interpolated(ref nt) => match **nt {
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Nonterminal::NtMeta(ref item) => Some(item.clone().into_inner()),
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_ => None,
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},
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_ => None,
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};
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Ok(if let Some(item) = item {
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self.bump();
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item
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} else {
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let path = self.parse_path(PathStyle::Mod)?;
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let args = self.parse_attr_args()?;
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ast::AttrItem { path, args }
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})
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}
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/// Parses attributes that appear after the opening of an item. These should
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/// be preceded by an exclamation mark, but we accept and warn about one
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/// terminated by a semicolon.
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///
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/// Matches `inner_attrs*`.
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crate fn parse_inner_attributes(&mut self) -> PResult<'a, Vec<ast::Attribute>> {
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let mut attrs: Vec<ast::Attribute> = vec![];
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loop {
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// Only try to parse if it is an inner attribute (has `!`).
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if self.check(&token::Pound) && self.look_ahead(1, |t| t == &token::Not) {
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let attr = self.parse_attribute(true)?;
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assert_eq!(attr.style, ast::AttrStyle::Inner);
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attrs.push(attr);
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} else if let token::DocComment(comment_kind, attr_style, data) = self.token.kind {
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// We need to get the position of this token before we bump.
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let attr = attr::mk_doc_comment(comment_kind, attr_style, data, self.token.span);
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if attr.style == ast::AttrStyle::Inner {
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attrs.push(attr);
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self.bump();
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} else {
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break;
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}
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} else {
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break;
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}
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}
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Ok(attrs)
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}
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crate fn parse_unsuffixed_lit(&mut self) -> PResult<'a, ast::Lit> {
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let lit = self.parse_lit()?;
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debug!("checking if {:?} is unusuffixed", lit);
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if !lit.kind.is_unsuffixed() {
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self.struct_span_err(lit.span, "suffixed literals are not allowed in attributes")
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.help(
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"instead of using a suffixed literal (`1u8`, `1.0f32`, etc.), \
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use an unsuffixed version (`1`, `1.0`, etc.)",
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)
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.emit();
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}
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Ok(lit)
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}
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/// Parses `cfg_attr(pred, attr_item_list)` where `attr_item_list` is comma-delimited.
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pub fn parse_cfg_attr(&mut self) -> PResult<'a, (ast::MetaItem, Vec<(ast::AttrItem, Span)>)> {
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let cfg_predicate = self.parse_meta_item()?;
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self.expect(&token::Comma)?;
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// Presumably, the majority of the time there will only be one attr.
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let mut expanded_attrs = Vec::with_capacity(1);
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while self.token.kind != token::Eof {
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let lo = self.token.span;
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let item = self.parse_attr_item()?;
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expanded_attrs.push((item, lo.to(self.prev_token.span)));
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if !self.eat(&token::Comma) {
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break;
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}
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}
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Ok((cfg_predicate, expanded_attrs))
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}
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/// Matches `COMMASEP(meta_item_inner)`.
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crate fn parse_meta_seq_top(&mut self) -> PResult<'a, Vec<ast::NestedMetaItem>> {
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// Presumably, the majority of the time there will only be one attr.
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let mut nmis = Vec::with_capacity(1);
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while self.token.kind != token::Eof {
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nmis.push(self.parse_meta_item_inner()?);
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if !self.eat(&token::Comma) {
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break;
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}
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}
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Ok(nmis)
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}
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/// Matches the following grammar (per RFC 1559).
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///
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/// meta_item : PATH ( '=' UNSUFFIXED_LIT | '(' meta_item_inner? ')' )? ;
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/// meta_item_inner : (meta_item | UNSUFFIXED_LIT) (',' meta_item_inner)? ;
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pub fn parse_meta_item(&mut self) -> PResult<'a, ast::MetaItem> {
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let nt_meta = match self.token.kind {
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token::Interpolated(ref nt) => match **nt {
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token::NtMeta(ref e) => Some(e.clone()),
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_ => None,
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},
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_ => None,
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};
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if let Some(item) = nt_meta {
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return match item.meta(item.path.span) {
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Some(meta) => {
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self.bump();
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Ok(meta)
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}
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None => self.unexpected(),
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};
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}
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let lo = self.token.span;
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let path = self.parse_path(PathStyle::Mod)?;
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let kind = self.parse_meta_item_kind()?;
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let span = lo.to(self.prev_token.span);
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Ok(ast::MetaItem { path, kind, span })
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}
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crate fn parse_meta_item_kind(&mut self) -> PResult<'a, ast::MetaItemKind> {
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Ok(if self.eat(&token::Eq) {
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ast::MetaItemKind::NameValue(self.parse_unsuffixed_lit()?)
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} else if self.check(&token::OpenDelim(token::Paren)) {
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// Matches `meta_seq = ( COMMASEP(meta_item_inner) )`.
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let (list, _) = self.parse_paren_comma_seq(|p| p.parse_meta_item_inner())?;
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ast::MetaItemKind::List(list)
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} else {
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ast::MetaItemKind::Word
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})
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}
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/// Matches `meta_item_inner : (meta_item | UNSUFFIXED_LIT) ;`.
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fn parse_meta_item_inner(&mut self) -> PResult<'a, ast::NestedMetaItem> {
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match self.parse_unsuffixed_lit() {
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Ok(lit) => return Ok(ast::NestedMetaItem::Literal(lit)),
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Err(ref mut err) => err.cancel(),
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}
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match self.parse_meta_item() {
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Ok(mi) => return Ok(ast::NestedMetaItem::MetaItem(mi)),
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Err(ref mut err) => err.cancel(),
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}
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let found = pprust::token_to_string(&self.token);
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let msg = format!("expected unsuffixed literal or identifier, found `{}`", found);
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Err(self.struct_span_err(self.token.span, &msg))
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}
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}
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