1344 lines
46 KiB
Rust
1344 lines
46 KiB
Rust
// Copyright 2012-2014 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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// Functions dealing with attributes and meta items
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pub use self::StabilityLevel::*;
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pub use self::ReprAttr::*;
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pub use self::IntType::*;
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use ast;
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use ast::{AttrId, Attribute, Name, Ident};
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use ast::{MetaItem, MetaItemKind, NestedMetaItem, NestedMetaItemKind};
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use ast::{Lit, LitKind, Expr, ExprKind, Item, Local, Stmt, StmtKind};
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use codemap::{Spanned, respan, dummy_spanned};
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use syntax_pos::{Span, DUMMY_SP};
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use errors::Handler;
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use feature_gate::{Features, GatedCfg};
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use parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
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use parse::parser::Parser;
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use parse::{self, ParseSess, PResult};
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use parse::token::{self, Token};
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use ptr::P;
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use symbol::Symbol;
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use tokenstream::{TokenStream, TokenTree, Delimited};
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use util::ThinVec;
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use std::cell::{RefCell, Cell};
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use std::iter;
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thread_local! {
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static USED_ATTRS: RefCell<Vec<u64>> = RefCell::new(Vec::new());
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static KNOWN_ATTRS: RefCell<Vec<u64>> = RefCell::new(Vec::new());
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}
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enum AttrError {
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MultipleItem(Name),
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UnknownMetaItem(Name),
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MissingSince,
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MissingFeature,
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MultipleStabilityLevels,
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UnsupportedLiteral
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}
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fn handle_errors(diag: &Handler, span: Span, error: AttrError) {
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match error {
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AttrError::MultipleItem(item) => span_err!(diag, span, E0538,
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"multiple '{}' items", item),
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AttrError::UnknownMetaItem(item) => span_err!(diag, span, E0541,
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"unknown meta item '{}'", item),
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AttrError::MissingSince => span_err!(diag, span, E0542, "missing 'since'"),
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AttrError::MissingFeature => span_err!(diag, span, E0546, "missing 'feature'"),
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AttrError::MultipleStabilityLevels => span_err!(diag, span, E0544,
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"multiple stability levels"),
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AttrError::UnsupportedLiteral => span_err!(diag, span, E0565, "unsupported literal"),
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}
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}
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pub fn mark_used(attr: &Attribute) {
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debug!("Marking {:?} as used.", attr);
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let AttrId(id) = attr.id;
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USED_ATTRS.with(|slot| {
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let idx = (id / 64) as usize;
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let shift = id % 64;
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if slot.borrow().len() <= idx {
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slot.borrow_mut().resize(idx + 1, 0);
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}
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slot.borrow_mut()[idx] |= 1 << shift;
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});
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}
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pub fn is_used(attr: &Attribute) -> bool {
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let AttrId(id) = attr.id;
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USED_ATTRS.with(|slot| {
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let idx = (id / 64) as usize;
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let shift = id % 64;
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slot.borrow().get(idx).map(|bits| bits & (1 << shift) != 0)
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.unwrap_or(false)
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})
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}
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pub fn mark_known(attr: &Attribute) {
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debug!("Marking {:?} as known.", attr);
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let AttrId(id) = attr.id;
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KNOWN_ATTRS.with(|slot| {
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let idx = (id / 64) as usize;
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let shift = id % 64;
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if slot.borrow().len() <= idx {
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slot.borrow_mut().resize(idx + 1, 0);
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}
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slot.borrow_mut()[idx] |= 1 << shift;
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});
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}
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pub fn is_known(attr: &Attribute) -> bool {
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let AttrId(id) = attr.id;
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KNOWN_ATTRS.with(|slot| {
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let idx = (id / 64) as usize;
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let shift = id % 64;
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slot.borrow().get(idx).map(|bits| bits & (1 << shift) != 0)
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.unwrap_or(false)
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})
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}
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impl NestedMetaItem {
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/// Returns the MetaItem if self is a NestedMetaItemKind::MetaItem.
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pub fn meta_item(&self) -> Option<&MetaItem> {
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match self.node {
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NestedMetaItemKind::MetaItem(ref item) => Some(&item),
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_ => None
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}
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}
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/// Returns the Lit if self is a NestedMetaItemKind::Literal.
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pub fn literal(&self) -> Option<&Lit> {
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match self.node {
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NestedMetaItemKind::Literal(ref lit) => Some(&lit),
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_ => None
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}
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}
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/// Returns the Span for `self`.
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pub fn span(&self) -> Span {
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self.span
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}
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/// Returns true if this list item is a MetaItem with a name of `name`.
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pub fn check_name(&self, name: &str) -> bool {
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self.meta_item().map_or(false, |meta_item| meta_item.check_name(name))
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}
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/// Returns the name of the meta item, e.g. `foo` in `#[foo]`,
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/// `#[foo="bar"]` and `#[foo(bar)]`, if self is a MetaItem
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pub fn name(&self) -> Option<Name> {
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self.meta_item().and_then(|meta_item| Some(meta_item.name()))
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}
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/// Gets the string value if self is a MetaItem and the MetaItem is a
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/// MetaItemKind::NameValue variant containing a string, otherwise None.
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pub fn value_str(&self) -> Option<Symbol> {
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self.meta_item().and_then(|meta_item| meta_item.value_str())
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}
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/// Returns a name and single literal value tuple of the MetaItem.
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pub fn name_value_literal(&self) -> Option<(Name, &Lit)> {
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self.meta_item().and_then(
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|meta_item| meta_item.meta_item_list().and_then(
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|meta_item_list| {
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if meta_item_list.len() == 1 {
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let nested_item = &meta_item_list[0];
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if nested_item.is_literal() {
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Some((meta_item.name(), nested_item.literal().unwrap()))
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} else {
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None
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}
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}
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else {
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None
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}}))
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}
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/// Returns a MetaItem if self is a MetaItem with Kind Word.
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pub fn word(&self) -> Option<&MetaItem> {
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self.meta_item().and_then(|meta_item| if meta_item.is_word() {
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Some(meta_item)
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} else {
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None
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})
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}
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/// Gets a list of inner meta items from a list MetaItem type.
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pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
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self.meta_item().and_then(|meta_item| meta_item.meta_item_list())
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}
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/// Returns `true` if the variant is MetaItem.
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pub fn is_meta_item(&self) -> bool {
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self.meta_item().is_some()
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}
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/// Returns `true` if the variant is Literal.
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pub fn is_literal(&self) -> bool {
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self.literal().is_some()
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}
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/// Returns `true` if self is a MetaItem and the meta item is a word.
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pub fn is_word(&self) -> bool {
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self.word().is_some()
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}
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/// Returns `true` if self is a MetaItem and the meta item is a ValueString.
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pub fn is_value_str(&self) -> bool {
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self.value_str().is_some()
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}
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/// Returns `true` if self is a MetaItem and the meta item is a list.
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pub fn is_meta_item_list(&self) -> bool {
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self.meta_item_list().is_some()
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}
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}
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impl Attribute {
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pub fn check_name(&self, name: &str) -> bool {
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let matches = self.path == name;
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if matches {
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mark_used(self);
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}
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matches
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}
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pub fn name(&self) -> Option<Name> {
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match self.path.segments.len() {
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1 => Some(self.path.segments[0].identifier.name),
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_ => None,
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}
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}
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pub fn value_str(&self) -> Option<Symbol> {
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self.meta().and_then(|meta| meta.value_str())
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}
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pub fn meta_item_list(&self) -> Option<Vec<NestedMetaItem>> {
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match self.meta() {
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Some(MetaItem { node: MetaItemKind::List(list), .. }) => Some(list),
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_ => None
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}
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}
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pub fn is_word(&self) -> bool {
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self.path.segments.len() == 1 && self.tokens.is_empty()
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}
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pub fn span(&self) -> Span {
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self.span
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}
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pub fn is_meta_item_list(&self) -> bool {
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self.meta_item_list().is_some()
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}
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/// Indicates if the attribute is a Value String.
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pub fn is_value_str(&self) -> bool {
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self.value_str().is_some()
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}
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}
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impl MetaItem {
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pub fn name(&self) -> Name {
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self.name
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}
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pub fn value_str(&self) -> Option<Symbol> {
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match self.node {
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MetaItemKind::NameValue(ref v) => {
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match v.node {
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LitKind::Str(ref s, _) => Some((*s).clone()),
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_ => None,
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}
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},
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_ => None
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}
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}
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pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
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match self.node {
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MetaItemKind::List(ref l) => Some(&l[..]),
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_ => None
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}
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}
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pub fn is_word(&self) -> bool {
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match self.node {
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MetaItemKind::Word => true,
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_ => false,
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}
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}
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pub fn span(&self) -> Span { self.span }
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pub fn check_name(&self, name: &str) -> bool {
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self.name() == name
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}
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pub fn is_value_str(&self) -> bool {
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self.value_str().is_some()
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}
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pub fn is_meta_item_list(&self) -> bool {
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self.meta_item_list().is_some()
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}
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}
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impl Attribute {
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/// Extract the MetaItem from inside this Attribute.
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pub fn meta(&self) -> Option<MetaItem> {
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let mut tokens = self.tokens.trees().peekable();
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Some(MetaItem {
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name: match self.path.segments.len() {
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1 => self.path.segments[0].identifier.name,
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_ => return None,
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},
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node: if let Some(node) = MetaItemKind::from_tokens(&mut tokens) {
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if tokens.peek().is_some() {
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return None;
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}
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node
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} else {
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return None;
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},
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span: self.span,
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})
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}
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pub fn parse<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, T>
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where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
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{
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let mut parser = Parser::new(sess, self.tokens.clone(), None, false);
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let result = f(&mut parser)?;
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if parser.token != token::Eof {
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parser.unexpected()?;
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}
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Ok(result)
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}
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pub fn parse_list<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, Vec<T>>
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where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
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{
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if self.tokens.is_empty() {
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return Ok(Vec::new());
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}
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self.parse(sess, |parser| {
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parser.expect(&token::OpenDelim(token::Paren))?;
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let mut list = Vec::new();
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while !parser.eat(&token::CloseDelim(token::Paren)) {
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list.push(f(parser)?);
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if !parser.eat(&token::Comma) {
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parser.expect(&token::CloseDelim(token::Paren))?;
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break
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}
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}
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Ok(list)
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})
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}
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pub fn parse_meta<'a>(&self, sess: &'a ParseSess) -> PResult<'a, MetaItem> {
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if self.path.segments.len() > 1 {
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sess.span_diagnostic.span_err(self.path.span, "expected ident, found path");
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}
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Ok(MetaItem {
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name: self.path.segments.last().unwrap().identifier.name,
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node: self.parse(sess, |parser| parser.parse_meta_item_kind())?,
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span: self.span,
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})
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}
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/// Convert self to a normal #[doc="foo"] comment, if it is a
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/// comment like `///` or `/** */`. (Returns self unchanged for
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/// non-sugared doc attributes.)
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pub fn with_desugared_doc<T, F>(&self, f: F) -> T where
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F: FnOnce(&Attribute) -> T,
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{
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if self.is_sugared_doc {
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let comment = self.value_str().unwrap();
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let meta = mk_name_value_item_str(
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Symbol::intern("doc"),
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Symbol::intern(&strip_doc_comment_decoration(&comment.as_str())));
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if self.style == ast::AttrStyle::Outer {
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f(&mk_attr_outer(self.span, self.id, meta))
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} else {
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f(&mk_attr_inner(self.span, self.id, meta))
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}
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} else {
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f(self)
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}
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}
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}
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/* Constructors */
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pub fn mk_name_value_item_str(name: Name, value: Symbol) -> MetaItem {
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let value_lit = dummy_spanned(LitKind::Str(value, ast::StrStyle::Cooked));
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mk_spanned_name_value_item(DUMMY_SP, name, value_lit)
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}
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pub fn mk_name_value_item(name: Name, value: ast::Lit) -> MetaItem {
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mk_spanned_name_value_item(DUMMY_SP, name, value)
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}
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pub fn mk_list_item(name: Name, items: Vec<NestedMetaItem>) -> MetaItem {
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mk_spanned_list_item(DUMMY_SP, name, items)
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}
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pub fn mk_list_word_item(name: Name) -> ast::NestedMetaItem {
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dummy_spanned(NestedMetaItemKind::MetaItem(mk_spanned_word_item(DUMMY_SP, name)))
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}
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pub fn mk_word_item(name: Name) -> MetaItem {
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mk_spanned_word_item(DUMMY_SP, name)
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}
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pub fn mk_spanned_name_value_item(sp: Span, name: Name, value: ast::Lit) -> MetaItem {
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MetaItem { span: sp, name: name, node: MetaItemKind::NameValue(value) }
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}
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pub fn mk_spanned_list_item(sp: Span, name: Name, items: Vec<NestedMetaItem>) -> MetaItem {
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MetaItem { span: sp, name: name, node: MetaItemKind::List(items) }
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}
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pub fn mk_spanned_word_item(sp: Span, name: Name) -> MetaItem {
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MetaItem { span: sp, name: name, node: MetaItemKind::Word }
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}
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thread_local! { static NEXT_ATTR_ID: Cell<usize> = Cell::new(0) }
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pub fn mk_attr_id() -> AttrId {
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let id = NEXT_ATTR_ID.with(|slot| {
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let r = slot.get();
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slot.set(r + 1);
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r
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});
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AttrId(id)
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}
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/// Returns an inner attribute with the given value.
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pub fn mk_attr_inner(span: Span, id: AttrId, item: MetaItem) -> Attribute {
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mk_spanned_attr_inner(span, id, item)
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}
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/// Returns an innter attribute with the given value and span.
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pub fn mk_spanned_attr_inner(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
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Attribute {
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id: id,
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style: ast::AttrStyle::Inner,
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path: ast::Path::from_ident(item.span, ast::Ident::with_empty_ctxt(item.name)),
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tokens: item.node.tokens(item.span),
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is_sugared_doc: false,
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span: sp,
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}
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}
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/// Returns an outer attribute with the given value.
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pub fn mk_attr_outer(span: Span, id: AttrId, item: MetaItem) -> Attribute {
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mk_spanned_attr_outer(span, id, item)
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}
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/// Returns an outer attribute with the given value and span.
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pub fn mk_spanned_attr_outer(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
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Attribute {
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id: id,
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style: ast::AttrStyle::Outer,
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path: ast::Path::from_ident(item.span, ast::Ident::with_empty_ctxt(item.name)),
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tokens: item.node.tokens(item.span),
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is_sugared_doc: false,
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span: sp,
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}
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}
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pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, span: Span) -> Attribute {
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let style = doc_comment_style(&text.as_str());
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let lit = respan(span, LitKind::Str(text, ast::StrStyle::Cooked));
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Attribute {
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id: id,
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style: style,
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path: ast::Path::from_ident(span, ast::Ident::from_str("doc")),
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tokens: MetaItemKind::NameValue(lit).tokens(span),
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is_sugared_doc: true,
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span: span,
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}
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}
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pub fn list_contains_name(items: &[NestedMetaItem], name: &str) -> bool {
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items.iter().any(|item| {
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item.check_name(name)
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})
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}
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pub fn contains_name(attrs: &[Attribute], name: &str) -> bool {
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attrs.iter().any(|item| {
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item.check_name(name)
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})
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}
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pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: &str) -> Option<Symbol> {
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attrs.iter()
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.find(|at| at.check_name(name))
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.and_then(|at| at.value_str())
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}
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/* Higher-level applications */
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pub fn find_crate_name(attrs: &[Attribute]) -> Option<Symbol> {
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|
first_attr_value_str_by_name(attrs, "crate_name")
|
|
}
|
|
|
|
/// Find the value of #[export_name=*] attribute and check its validity.
|
|
pub fn find_export_name_attr(diag: &Handler, attrs: &[Attribute]) -> Option<Symbol> {
|
|
attrs.iter().fold(None, |ia,attr| {
|
|
if attr.check_name("export_name") {
|
|
if let s@Some(_) = attr.value_str() {
|
|
s
|
|
} else {
|
|
struct_span_err!(diag, attr.span, E0558,
|
|
"export_name attribute has invalid format")
|
|
.span_label(attr.span,
|
|
&format!("did you mean #[export_name=\"*\"]?"))
|
|
.emit();
|
|
None
|
|
}
|
|
} else {
|
|
ia
|
|
}
|
|
})
|
|
}
|
|
|
|
pub fn contains_extern_indicator(diag: &Handler, attrs: &[Attribute]) -> bool {
|
|
contains_name(attrs, "no_mangle") ||
|
|
find_export_name_attr(diag, attrs).is_some()
|
|
}
|
|
|
|
#[derive(Copy, Clone, PartialEq)]
|
|
pub enum InlineAttr {
|
|
None,
|
|
Hint,
|
|
Always,
|
|
Never,
|
|
}
|
|
|
|
/// Determine what `#[inline]` attribute is present in `attrs`, if any.
|
|
pub fn find_inline_attr(diagnostic: Option<&Handler>, attrs: &[Attribute]) -> InlineAttr {
|
|
attrs.iter().fold(InlineAttr::None, |ia, attr| {
|
|
if attr.path != "inline" {
|
|
return ia;
|
|
}
|
|
let meta = match attr.meta() {
|
|
Some(meta) => meta.node,
|
|
None => return ia,
|
|
};
|
|
match meta {
|
|
MetaItemKind::Word => {
|
|
mark_used(attr);
|
|
InlineAttr::Hint
|
|
}
|
|
MetaItemKind::List(ref items) => {
|
|
mark_used(attr);
|
|
if items.len() != 1 {
|
|
diagnostic.map(|d|{ span_err!(d, attr.span, E0534, "expected one argument"); });
|
|
InlineAttr::None
|
|
} else if list_contains_name(&items[..], "always") {
|
|
InlineAttr::Always
|
|
} else if list_contains_name(&items[..], "never") {
|
|
InlineAttr::Never
|
|
} else {
|
|
diagnostic.map(|d| {
|
|
span_err!(d, items[0].span, E0535, "invalid argument");
|
|
});
|
|
|
|
InlineAttr::None
|
|
}
|
|
}
|
|
_ => ia,
|
|
}
|
|
})
|
|
}
|
|
|
|
/// True if `#[inline]` or `#[inline(always)]` is present in `attrs`.
|
|
pub fn requests_inline(attrs: &[Attribute]) -> bool {
|
|
match find_inline_attr(None, attrs) {
|
|
InlineAttr::Hint | InlineAttr::Always => true,
|
|
InlineAttr::None | InlineAttr::Never => false,
|
|
}
|
|
}
|
|
|
|
/// Tests if a cfg-pattern matches the cfg set
|
|
pub fn cfg_matches(cfg: &ast::MetaItem, sess: &ParseSess, features: Option<&Features>) -> bool {
|
|
match cfg.node {
|
|
ast::MetaItemKind::List(ref mis) => {
|
|
for mi in mis.iter() {
|
|
if !mi.is_meta_item() {
|
|
handle_errors(&sess.span_diagnostic, mi.span, AttrError::UnsupportedLiteral);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// The unwraps below may look dangerous, but we've already asserted
|
|
// that they won't fail with the loop above.
|
|
match &*cfg.name.as_str() {
|
|
"any" => mis.iter().any(|mi| {
|
|
cfg_matches(mi.meta_item().unwrap(), sess, features)
|
|
}),
|
|
"all" => mis.iter().all(|mi| {
|
|
cfg_matches(mi.meta_item().unwrap(), sess, features)
|
|
}),
|
|
"not" => {
|
|
if mis.len() != 1 {
|
|
span_err!(sess.span_diagnostic, cfg.span, E0536, "expected 1 cfg-pattern");
|
|
return false;
|
|
}
|
|
|
|
!cfg_matches(mis[0].meta_item().unwrap(), sess, features)
|
|
},
|
|
p => {
|
|
span_err!(sess.span_diagnostic, cfg.span, E0537, "invalid predicate `{}`", p);
|
|
false
|
|
}
|
|
}
|
|
},
|
|
ast::MetaItemKind::Word | ast::MetaItemKind::NameValue(..) => {
|
|
if let (Some(feats), Some(gated_cfg)) = (features, GatedCfg::gate(cfg)) {
|
|
gated_cfg.check_and_emit(sess, feats);
|
|
}
|
|
sess.config.contains(&(cfg.name(), cfg.value_str()))
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Represents the #[stable], #[unstable] and #[rustc_deprecated] attributes.
|
|
#[derive(RustcEncodable, RustcDecodable, Clone, Debug, PartialEq, Eq, Hash)]
|
|
pub struct Stability {
|
|
pub level: StabilityLevel,
|
|
pub feature: Symbol,
|
|
pub rustc_depr: Option<RustcDeprecation>,
|
|
}
|
|
|
|
/// The available stability levels.
|
|
#[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)]
|
|
pub enum StabilityLevel {
|
|
// Reason for the current stability level and the relevant rust-lang issue
|
|
Unstable { reason: Option<Symbol>, issue: u32 },
|
|
Stable { since: Symbol },
|
|
}
|
|
|
|
#[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)]
|
|
pub struct RustcDeprecation {
|
|
pub since: Symbol,
|
|
pub reason: Symbol,
|
|
}
|
|
|
|
#[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)]
|
|
pub struct Deprecation {
|
|
pub since: Option<Symbol>,
|
|
pub note: Option<Symbol>,
|
|
}
|
|
|
|
impl StabilityLevel {
|
|
pub fn is_unstable(&self) -> bool { if let Unstable {..} = *self { true } else { false }}
|
|
pub fn is_stable(&self) -> bool { if let Stable {..} = *self { true } else { false }}
|
|
}
|
|
|
|
fn find_stability_generic<'a, I>(diagnostic: &Handler,
|
|
attrs_iter: I,
|
|
item_sp: Span)
|
|
-> Option<Stability>
|
|
where I: Iterator<Item = &'a Attribute>
|
|
{
|
|
let mut stab: Option<Stability> = None;
|
|
let mut rustc_depr: Option<RustcDeprecation> = None;
|
|
|
|
'outer: for attr in attrs_iter {
|
|
if attr.path != "rustc_deprecated" && attr.path != "unstable" && attr.path != "stable" {
|
|
continue // not a stability level
|
|
}
|
|
|
|
mark_used(attr);
|
|
|
|
let meta = attr.meta();
|
|
if let Some(MetaItem { node: MetaItemKind::List(ref metas), .. }) = meta {
|
|
let meta = meta.as_ref().unwrap();
|
|
let get = |meta: &MetaItem, item: &mut Option<Symbol>| {
|
|
if item.is_some() {
|
|
handle_errors(diagnostic, meta.span, AttrError::MultipleItem(meta.name()));
|
|
return false
|
|
}
|
|
if let Some(v) = meta.value_str() {
|
|
*item = Some(v);
|
|
true
|
|
} else {
|
|
span_err!(diagnostic, meta.span, E0539, "incorrect meta item");
|
|
false
|
|
}
|
|
};
|
|
|
|
match &*meta.name.as_str() {
|
|
"rustc_deprecated" => {
|
|
if rustc_depr.is_some() {
|
|
span_err!(diagnostic, item_sp, E0540,
|
|
"multiple rustc_deprecated attributes");
|
|
break
|
|
}
|
|
|
|
let mut since = None;
|
|
let mut reason = None;
|
|
for meta in metas {
|
|
if let Some(mi) = meta.meta_item() {
|
|
match &*mi.name().as_str() {
|
|
"since" => if !get(mi, &mut since) { continue 'outer },
|
|
"reason" => if !get(mi, &mut reason) { continue 'outer },
|
|
_ => {
|
|
handle_errors(diagnostic, mi.span,
|
|
AttrError::UnknownMetaItem(mi.name()));
|
|
continue 'outer
|
|
}
|
|
}
|
|
} else {
|
|
handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral);
|
|
continue 'outer
|
|
}
|
|
}
|
|
|
|
match (since, reason) {
|
|
(Some(since), Some(reason)) => {
|
|
rustc_depr = Some(RustcDeprecation {
|
|
since: since,
|
|
reason: reason,
|
|
})
|
|
}
|
|
(None, _) => {
|
|
handle_errors(diagnostic, attr.span(), AttrError::MissingSince);
|
|
continue
|
|
}
|
|
_ => {
|
|
span_err!(diagnostic, attr.span(), E0543, "missing 'reason'");
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
"unstable" => {
|
|
if stab.is_some() {
|
|
handle_errors(diagnostic, attr.span(), AttrError::MultipleStabilityLevels);
|
|
break
|
|
}
|
|
|
|
let mut feature = None;
|
|
let mut reason = None;
|
|
let mut issue = None;
|
|
for meta in metas {
|
|
if let Some(mi) = meta.meta_item() {
|
|
match &*mi.name().as_str() {
|
|
"feature" => if !get(mi, &mut feature) { continue 'outer },
|
|
"reason" => if !get(mi, &mut reason) { continue 'outer },
|
|
"issue" => if !get(mi, &mut issue) { continue 'outer },
|
|
_ => {
|
|
handle_errors(diagnostic, meta.span,
|
|
AttrError::UnknownMetaItem(mi.name()));
|
|
continue 'outer
|
|
}
|
|
}
|
|
} else {
|
|
handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral);
|
|
continue 'outer
|
|
}
|
|
}
|
|
|
|
match (feature, reason, issue) {
|
|
(Some(feature), reason, Some(issue)) => {
|
|
stab = Some(Stability {
|
|
level: Unstable {
|
|
reason: reason,
|
|
issue: {
|
|
if let Ok(issue) = issue.as_str().parse() {
|
|
issue
|
|
} else {
|
|
span_err!(diagnostic, attr.span(), E0545,
|
|
"incorrect 'issue'");
|
|
continue
|
|
}
|
|
}
|
|
},
|
|
feature: feature,
|
|
rustc_depr: None,
|
|
})
|
|
}
|
|
(None, _, _) => {
|
|
handle_errors(diagnostic, attr.span(), AttrError::MissingFeature);
|
|
continue
|
|
}
|
|
_ => {
|
|
span_err!(diagnostic, attr.span(), E0547, "missing 'issue'");
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
"stable" => {
|
|
if stab.is_some() {
|
|
handle_errors(diagnostic, attr.span(), AttrError::MultipleStabilityLevels);
|
|
break
|
|
}
|
|
|
|
let mut feature = None;
|
|
let mut since = None;
|
|
for meta in metas {
|
|
if let NestedMetaItemKind::MetaItem(ref mi) = meta.node {
|
|
match &*mi.name().as_str() {
|
|
"feature" => if !get(mi, &mut feature) { continue 'outer },
|
|
"since" => if !get(mi, &mut since) { continue 'outer },
|
|
_ => {
|
|
handle_errors(diagnostic, meta.span,
|
|
AttrError::UnknownMetaItem(mi.name()));
|
|
continue 'outer
|
|
}
|
|
}
|
|
} else {
|
|
handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral);
|
|
continue 'outer
|
|
}
|
|
}
|
|
|
|
match (feature, since) {
|
|
(Some(feature), Some(since)) => {
|
|
stab = Some(Stability {
|
|
level: Stable {
|
|
since: since,
|
|
},
|
|
feature: feature,
|
|
rustc_depr: None,
|
|
})
|
|
}
|
|
(None, _) => {
|
|
handle_errors(diagnostic, attr.span(), AttrError::MissingFeature);
|
|
continue
|
|
}
|
|
_ => {
|
|
handle_errors(diagnostic, attr.span(), AttrError::MissingSince);
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
_ => unreachable!()
|
|
}
|
|
} else {
|
|
span_err!(diagnostic, attr.span(), E0548, "incorrect stability attribute type");
|
|
continue
|
|
}
|
|
}
|
|
|
|
// Merge the deprecation info into the stability info
|
|
if let Some(rustc_depr) = rustc_depr {
|
|
if let Some(ref mut stab) = stab {
|
|
stab.rustc_depr = Some(rustc_depr);
|
|
} else {
|
|
span_err!(diagnostic, item_sp, E0549,
|
|
"rustc_deprecated attribute must be paired with \
|
|
either stable or unstable attribute");
|
|
}
|
|
}
|
|
|
|
stab
|
|
}
|
|
|
|
fn find_deprecation_generic<'a, I>(diagnostic: &Handler,
|
|
attrs_iter: I,
|
|
item_sp: Span)
|
|
-> Option<Deprecation>
|
|
where I: Iterator<Item = &'a Attribute>
|
|
{
|
|
let mut depr: Option<Deprecation> = None;
|
|
|
|
'outer: for attr in attrs_iter {
|
|
if attr.path != "deprecated" {
|
|
continue
|
|
}
|
|
|
|
mark_used(attr);
|
|
|
|
if depr.is_some() {
|
|
span_err!(diagnostic, item_sp, E0550, "multiple deprecated attributes");
|
|
break
|
|
}
|
|
|
|
depr = if let Some(metas) = attr.meta_item_list() {
|
|
let get = |meta: &MetaItem, item: &mut Option<Symbol>| {
|
|
if item.is_some() {
|
|
handle_errors(diagnostic, meta.span, AttrError::MultipleItem(meta.name()));
|
|
return false
|
|
}
|
|
if let Some(v) = meta.value_str() {
|
|
*item = Some(v);
|
|
true
|
|
} else {
|
|
span_err!(diagnostic, meta.span, E0551, "incorrect meta item");
|
|
false
|
|
}
|
|
};
|
|
|
|
let mut since = None;
|
|
let mut note = None;
|
|
for meta in metas {
|
|
if let NestedMetaItemKind::MetaItem(ref mi) = meta.node {
|
|
match &*mi.name().as_str() {
|
|
"since" => if !get(mi, &mut since) { continue 'outer },
|
|
"note" => if !get(mi, &mut note) { continue 'outer },
|
|
_ => {
|
|
handle_errors(diagnostic, meta.span,
|
|
AttrError::UnknownMetaItem(mi.name()));
|
|
continue 'outer
|
|
}
|
|
}
|
|
} else {
|
|
handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral);
|
|
continue 'outer
|
|
}
|
|
}
|
|
|
|
Some(Deprecation {since: since, note: note})
|
|
} else {
|
|
Some(Deprecation{since: None, note: None})
|
|
}
|
|
}
|
|
|
|
depr
|
|
}
|
|
|
|
/// Find the first stability attribute. `None` if none exists.
|
|
pub fn find_stability(diagnostic: &Handler, attrs: &[Attribute],
|
|
item_sp: Span) -> Option<Stability> {
|
|
find_stability_generic(diagnostic, attrs.iter(), item_sp)
|
|
}
|
|
|
|
/// Find the deprecation attribute. `None` if none exists.
|
|
pub fn find_deprecation(diagnostic: &Handler, attrs: &[Attribute],
|
|
item_sp: Span) -> Option<Deprecation> {
|
|
find_deprecation_generic(diagnostic, attrs.iter(), item_sp)
|
|
}
|
|
|
|
|
|
/// Parse #[repr(...)] forms.
|
|
///
|
|
/// Valid repr contents: any of the primitive integral type names (see
|
|
/// `int_type_of_word`, below) to specify enum discriminant type; `C`, to use
|
|
/// the same discriminant size that the corresponding C enum would or C
|
|
/// structure layout, and `packed` to remove padding.
|
|
pub fn find_repr_attrs(diagnostic: &Handler, attr: &Attribute) -> Vec<ReprAttr> {
|
|
let mut acc = Vec::new();
|
|
if attr.path == "repr" {
|
|
if let Some(items) = attr.meta_item_list() {
|
|
mark_used(attr);
|
|
for item in items {
|
|
if !item.is_meta_item() {
|
|
handle_errors(diagnostic, item.span, AttrError::UnsupportedLiteral);
|
|
continue
|
|
}
|
|
|
|
let mut recognised = false;
|
|
if let Some(mi) = item.word() {
|
|
let word = &*mi.name().as_str();
|
|
let hint = match word {
|
|
// Can't use "extern" because it's not a lexical identifier.
|
|
"C" => Some(ReprExtern),
|
|
"packed" => Some(ReprPacked),
|
|
"simd" => Some(ReprSimd),
|
|
_ => match int_type_of_word(word) {
|
|
Some(ity) => Some(ReprInt(ity)),
|
|
None => {
|
|
None
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some(h) = hint {
|
|
recognised = true;
|
|
acc.push(h);
|
|
}
|
|
} else if let Some((name, value)) = item.name_value_literal() {
|
|
if name == "align" {
|
|
recognised = true;
|
|
let mut align_error = None;
|
|
if let ast::LitKind::Int(align, ast::LitIntType::Unsuffixed) = value.node {
|
|
if align.is_power_of_two() {
|
|
// rustc::ty::layout::Align restricts align to <= 32768
|
|
if align <= 32768 {
|
|
acc.push(ReprAlign(align as u16));
|
|
} else {
|
|
align_error = Some("larger than 32768");
|
|
}
|
|
} else {
|
|
align_error = Some("not a power of two");
|
|
}
|
|
} else {
|
|
align_error = Some("not an unsuffixed integer");
|
|
}
|
|
if let Some(align_error) = align_error {
|
|
span_err!(diagnostic, item.span, E0589,
|
|
"invalid `repr(align)` attribute: {}", align_error);
|
|
}
|
|
}
|
|
}
|
|
if !recognised {
|
|
// Not a word we recognize
|
|
span_err!(diagnostic, item.span, E0552,
|
|
"unrecognized representation hint");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
acc
|
|
}
|
|
|
|
fn int_type_of_word(s: &str) -> Option<IntType> {
|
|
match s {
|
|
"i8" => Some(SignedInt(ast::IntTy::I8)),
|
|
"u8" => Some(UnsignedInt(ast::UintTy::U8)),
|
|
"i16" => Some(SignedInt(ast::IntTy::I16)),
|
|
"u16" => Some(UnsignedInt(ast::UintTy::U16)),
|
|
"i32" => Some(SignedInt(ast::IntTy::I32)),
|
|
"u32" => Some(UnsignedInt(ast::UintTy::U32)),
|
|
"i64" => Some(SignedInt(ast::IntTy::I64)),
|
|
"u64" => Some(UnsignedInt(ast::UintTy::U64)),
|
|
"i128" => Some(SignedInt(ast::IntTy::I128)),
|
|
"u128" => Some(UnsignedInt(ast::UintTy::U128)),
|
|
"isize" => Some(SignedInt(ast::IntTy::Is)),
|
|
"usize" => Some(UnsignedInt(ast::UintTy::Us)),
|
|
_ => None
|
|
}
|
|
}
|
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#[derive(PartialEq, Debug, RustcEncodable, RustcDecodable, Copy, Clone)]
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|
pub enum ReprAttr {
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ReprInt(IntType),
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ReprExtern,
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ReprPacked,
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ReprSimd,
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ReprAlign(u16),
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}
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#[derive(Eq, Hash, PartialEq, Debug, RustcEncodable, RustcDecodable, Copy, Clone)]
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|
pub enum IntType {
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SignedInt(ast::IntTy),
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|
UnsignedInt(ast::UintTy)
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|
}
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|
|
|
impl IntType {
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|
#[inline]
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|
pub fn is_signed(self) -> bool {
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|
match self {
|
|
SignedInt(..) => true,
|
|
UnsignedInt(..) => false
|
|
}
|
|
}
|
|
}
|
|
|
|
impl MetaItem {
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|
fn tokens(&self) -> TokenStream {
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let ident = TokenTree::Token(self.span, Token::Ident(Ident::with_empty_ctxt(self.name)));
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TokenStream::concat(vec![ident.into(), self.node.tokens(self.span)])
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|
}
|
|
|
|
fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem>
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|
where I: Iterator<Item = TokenTree>,
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|
{
|
|
let (mut span, name) = match tokens.next() {
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|
Some(TokenTree::Token(span, Token::Ident(ident))) => (span, ident.name),
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|
Some(TokenTree::Token(_, Token::Interpolated(ref nt))) => match **nt {
|
|
token::Nonterminal::NtIdent(ident) => (ident.span, ident.node.name),
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|
token::Nonterminal::NtMeta(ref meta) => return Some(meta.clone()),
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|
_ => return None,
|
|
},
|
|
_ => return None,
|
|
};
|
|
let node = match MetaItemKind::from_tokens(tokens) {
|
|
Some(node) => node,
|
|
_ => return None,
|
|
};
|
|
if let Some(last_span) = node.last_span() {
|
|
span.hi = last_span.hi;
|
|
}
|
|
Some(MetaItem { name: name, span: span, node: node })
|
|
}
|
|
}
|
|
|
|
impl MetaItemKind {
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|
fn last_span(&self) -> Option<Span> {
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|
match *self {
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|
MetaItemKind::Word => None,
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|
MetaItemKind::List(ref list) => list.last().map(NestedMetaItem::span),
|
|
MetaItemKind::NameValue(ref lit) => Some(lit.span),
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|
}
|
|
}
|
|
|
|
pub fn tokens(&self, span: Span) -> TokenStream {
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|
match *self {
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|
MetaItemKind::Word => TokenStream::empty(),
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|
MetaItemKind::NameValue(ref lit) => {
|
|
TokenStream::concat(vec![TokenTree::Token(span, Token::Eq).into(), lit.tokens()])
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|
}
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|
MetaItemKind::List(ref list) => {
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|
let mut tokens = Vec::new();
|
|
for (i, item) in list.iter().enumerate() {
|
|
if i > 0 {
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|
tokens.push(TokenTree::Token(span, Token::Comma).into());
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|
}
|
|
tokens.push(item.node.tokens());
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|
}
|
|
TokenTree::Delimited(span, Delimited {
|
|
delim: token::Paren,
|
|
tts: TokenStream::concat(tokens).into(),
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|
}).into()
|
|
}
|
|
}
|
|
}
|
|
|
|
fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItemKind>
|
|
where I: Iterator<Item = TokenTree>,
|
|
{
|
|
let delimited = match tokens.peek().cloned() {
|
|
Some(TokenTree::Token(_, token::Eq)) => {
|
|
tokens.next();
|
|
return if let Some(TokenTree::Token(span, token)) = tokens.next() {
|
|
LitKind::from_token(token)
|
|
.map(|lit| MetaItemKind::NameValue(Spanned { node: lit, span: span }))
|
|
} else {
|
|
None
|
|
};
|
|
}
|
|
Some(TokenTree::Delimited(_, ref delimited)) if delimited.delim == token::Paren => {
|
|
tokens.next();
|
|
delimited.stream()
|
|
}
|
|
_ => return Some(MetaItemKind::Word),
|
|
};
|
|
|
|
let mut tokens = delimited.into_trees().peekable();
|
|
let mut result = Vec::new();
|
|
while let Some(..) = tokens.peek() {
|
|
match NestedMetaItemKind::from_tokens(&mut tokens) {
|
|
Some(item) => result.push(Spanned { span: item.span(), node: item }),
|
|
None => return None,
|
|
}
|
|
match tokens.next() {
|
|
None | Some(TokenTree::Token(_, Token::Comma)) => {}
|
|
_ => return None,
|
|
}
|
|
}
|
|
Some(MetaItemKind::List(result))
|
|
}
|
|
}
|
|
|
|
impl NestedMetaItemKind {
|
|
fn span(&self) -> Span {
|
|
match *self {
|
|
NestedMetaItemKind::MetaItem(ref item) => item.span,
|
|
NestedMetaItemKind::Literal(ref lit) => lit.span,
|
|
}
|
|
}
|
|
|
|
fn tokens(&self) -> TokenStream {
|
|
match *self {
|
|
NestedMetaItemKind::MetaItem(ref item) => item.tokens(),
|
|
NestedMetaItemKind::Literal(ref lit) => lit.tokens(),
|
|
}
|
|
}
|
|
|
|
fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<NestedMetaItemKind>
|
|
where I: Iterator<Item = TokenTree>,
|
|
{
|
|
if let Some(TokenTree::Token(span, token)) = tokens.peek().cloned() {
|
|
if let Some(node) = LitKind::from_token(token) {
|
|
tokens.next();
|
|
return Some(NestedMetaItemKind::Literal(Spanned { node: node, span: span }));
|
|
}
|
|
}
|
|
|
|
MetaItem::from_tokens(tokens).map(NestedMetaItemKind::MetaItem)
|
|
}
|
|
}
|
|
|
|
impl Lit {
|
|
fn tokens(&self) -> TokenStream {
|
|
TokenTree::Token(self.span, self.node.token()).into()
|
|
}
|
|
}
|
|
|
|
impl LitKind {
|
|
fn token(&self) -> Token {
|
|
use std::ascii;
|
|
|
|
match *self {
|
|
LitKind::Str(string, ast::StrStyle::Cooked) => {
|
|
let mut escaped = String::new();
|
|
for ch in string.as_str().chars() {
|
|
escaped.extend(ch.escape_unicode());
|
|
}
|
|
Token::Literal(token::Lit::Str_(Symbol::intern(&escaped)), None)
|
|
}
|
|
LitKind::Str(string, ast::StrStyle::Raw(n)) => {
|
|
Token::Literal(token::Lit::StrRaw(string, n), None)
|
|
}
|
|
LitKind::ByteStr(ref bytes) => {
|
|
let string = bytes.iter().cloned().flat_map(ascii::escape_default)
|
|
.map(Into::<char>::into).collect::<String>();
|
|
Token::Literal(token::Lit::ByteStr(Symbol::intern(&string)), None)
|
|
}
|
|
LitKind::Byte(byte) => {
|
|
let string: String = ascii::escape_default(byte).map(Into::<char>::into).collect();
|
|
Token::Literal(token::Lit::Byte(Symbol::intern(&string)), None)
|
|
}
|
|
LitKind::Char(ch) => {
|
|
let string: String = ch.escape_default().map(Into::<char>::into).collect();
|
|
Token::Literal(token::Lit::Char(Symbol::intern(&string)), None)
|
|
}
|
|
LitKind::Int(n, ty) => {
|
|
let suffix = match ty {
|
|
ast::LitIntType::Unsigned(ty) => Some(Symbol::intern(ty.ty_to_string())),
|
|
ast::LitIntType::Signed(ty) => Some(Symbol::intern(ty.ty_to_string())),
|
|
ast::LitIntType::Unsuffixed => None,
|
|
};
|
|
Token::Literal(token::Lit::Integer(Symbol::intern(&n.to_string())), suffix)
|
|
}
|
|
LitKind::Float(symbol, ty) => {
|
|
Token::Literal(token::Lit::Float(symbol), Some(Symbol::intern(ty.ty_to_string())))
|
|
}
|
|
LitKind::FloatUnsuffixed(symbol) => Token::Literal(token::Lit::Float(symbol), None),
|
|
LitKind::Bool(value) => Token::Ident(Ident::with_empty_ctxt(Symbol::intern(match value {
|
|
true => "true",
|
|
false => "false",
|
|
}))),
|
|
}
|
|
}
|
|
|
|
fn from_token(token: Token) -> Option<LitKind> {
|
|
match token {
|
|
Token::Ident(ident) if ident.name == "true" => Some(LitKind::Bool(true)),
|
|
Token::Ident(ident) if ident.name == "false" => Some(LitKind::Bool(false)),
|
|
Token::Interpolated(ref nt) => match **nt {
|
|
token::NtExpr(ref v) => match v.node {
|
|
ExprKind::Lit(ref lit) => Some(lit.node.clone()),
|
|
_ => None,
|
|
},
|
|
_ => None,
|
|
},
|
|
Token::Literal(lit, suf) => {
|
|
let (suffix_illegal, result) = parse::lit_token(lit, suf, None);
|
|
if suffix_illegal && suf.is_some() {
|
|
return None;
|
|
}
|
|
result
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
pub trait HasAttrs: Sized {
|
|
fn attrs(&self) -> &[ast::Attribute];
|
|
fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self;
|
|
}
|
|
|
|
impl<T: HasAttrs> HasAttrs for Spanned<T> {
|
|
fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
|
|
fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self {
|
|
Spanned { node: self.node.map_attrs(f), span: self.span }
|
|
}
|
|
}
|
|
|
|
impl HasAttrs for Vec<Attribute> {
|
|
fn attrs(&self) -> &[Attribute] {
|
|
&self
|
|
}
|
|
fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
|
|
f(self)
|
|
}
|
|
}
|
|
|
|
impl HasAttrs for ThinVec<Attribute> {
|
|
fn attrs(&self) -> &[Attribute] {
|
|
&self
|
|
}
|
|
fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
|
|
f(self.into()).into()
|
|
}
|
|
}
|
|
|
|
impl<T: HasAttrs + 'static> HasAttrs for P<T> {
|
|
fn attrs(&self) -> &[Attribute] {
|
|
(**self).attrs()
|
|
}
|
|
fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
|
|
self.map(|t| t.map_attrs(f))
|
|
}
|
|
}
|
|
|
|
impl HasAttrs for StmtKind {
|
|
fn attrs(&self) -> &[Attribute] {
|
|
match *self {
|
|
StmtKind::Local(ref local) => local.attrs(),
|
|
StmtKind::Item(..) => &[],
|
|
StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => expr.attrs(),
|
|
StmtKind::Mac(ref mac) => {
|
|
let (_, _, ref attrs) = **mac;
|
|
attrs.attrs()
|
|
}
|
|
}
|
|
}
|
|
|
|
fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
|
|
match self {
|
|
StmtKind::Local(local) => StmtKind::Local(local.map_attrs(f)),
|
|
StmtKind::Item(..) => self,
|
|
StmtKind::Expr(expr) => StmtKind::Expr(expr.map_attrs(f)),
|
|
StmtKind::Semi(expr) => StmtKind::Semi(expr.map_attrs(f)),
|
|
StmtKind::Mac(mac) => StmtKind::Mac(mac.map(|(mac, style, attrs)| {
|
|
(mac, style, attrs.map_attrs(f))
|
|
})),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl HasAttrs for Stmt {
|
|
fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
|
|
fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self {
|
|
Stmt { id: self.id, node: self.node.map_attrs(f), span: self.span }
|
|
}
|
|
}
|
|
|
|
macro_rules! derive_has_attrs {
|
|
($($ty:path),*) => { $(
|
|
impl HasAttrs for $ty {
|
|
fn attrs(&self) -> &[Attribute] {
|
|
&self.attrs
|
|
}
|
|
|
|
fn map_attrs<F>(mut self, f: F) -> Self
|
|
where F: FnOnce(Vec<Attribute>) -> Vec<Attribute>,
|
|
{
|
|
self.attrs = self.attrs.map_attrs(f);
|
|
self
|
|
}
|
|
}
|
|
)* }
|
|
}
|
|
|
|
derive_has_attrs! {
|
|
Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm,
|
|
ast::Field, ast::FieldPat, ast::Variant_
|
|
}
|