1065 lines
36 KiB
Rust
1065 lines
36 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};
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use ast::{MetaItem, MetaItemKind, NestedMetaItem, NestedMetaItemKind};
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use ast::{Lit, Expr, Item, Local, Stmt, StmtKind};
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use codemap::{spanned, dummy_spanned, mk_sp};
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use syntax_pos::{Span, BytePos, 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::ParseSess;
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use ptr::P;
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use symbol::Symbol;
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use util::ThinVec;
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use std::cell::{RefCell, Cell};
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use std::collections::HashSet;
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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 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.name() == 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) -> Name { self.meta().name() }
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pub fn value_str(&self) -> Option<Symbol> {
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self.meta().value_str()
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}
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pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
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self.meta().meta_item_list()
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}
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pub fn is_word(&self) -> bool { self.meta().is_word() }
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pub fn span(&self) -> Span { self.meta().span }
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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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ast::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) -> &MetaItem {
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&self.value
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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.id, meta))
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} else {
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f(&mk_attr_inner(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(ast::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(id: AttrId, item: MetaItem) -> Attribute {
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mk_spanned_attr_inner(DUMMY_SP, 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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value: item,
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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(id: AttrId, item: MetaItem) -> Attribute {
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mk_spanned_attr_outer(DUMMY_SP, 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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value: item,
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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_doc_attr_outer(id: AttrId, item: MetaItem, is_sugared_doc: bool) -> Attribute {
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Attribute {
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id: id,
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style: ast::AttrStyle::Outer,
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value: item,
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is_sugared_doc: is_sugared_doc,
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span: DUMMY_SP,
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}
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}
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pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, lo: BytePos, hi: BytePos)
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-> Attribute {
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let style = doc_comment_style(&text.as_str());
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let lit = spanned(lo, hi, ast::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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value: MetaItem {
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span: mk_sp(lo, hi),
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name: Symbol::intern("doc"),
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node: MetaItemKind::NameValue(lit),
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},
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is_sugared_doc: true,
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span: mk_sp(lo, hi),
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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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debug!("attr::list_contains_name (name={})", name);
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items.iter().any(|item| {
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debug!(" testing: {:?}", item.name());
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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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debug!("attr::contains_name (name={})", name);
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attrs.iter().any(|item| {
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debug!(" testing: {}", item.name());
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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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pub fn last_meta_item_value_str_by_name(items: &[MetaItem], name: &str) -> Option<Symbol> {
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items.iter()
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.rev()
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.find(|mi| mi.check_name(name))
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.and_then(|i| i.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")
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}
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/// Find the value of #[export_name=*] attribute and check its validity.
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pub fn find_export_name_attr(diag: &Handler, attrs: &[Attribute]) -> Option<Symbol> {
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attrs.iter().fold(None, |ia,attr| {
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if attr.check_name("export_name") {
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if let s@Some(_) = attr.value_str() {
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s
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} else {
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struct_span_err!(diag, attr.span, E0558,
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"export_name attribute has invalid format")
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.span_label(attr.span,
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&format!("did you mean #[export_name=\"*\"]?"))
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.emit();
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None
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}
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} else {
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ia
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}
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})
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}
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pub fn contains_extern_indicator(diag: &Handler, attrs: &[Attribute]) -> bool {
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contains_name(attrs, "no_mangle") ||
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find_export_name_attr(diag, attrs).is_some()
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}
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#[derive(Copy, Clone, PartialEq)]
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pub enum InlineAttr {
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None,
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Hint,
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Always,
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Never,
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}
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/// Determine what `#[inline]` attribute is present in `attrs`, if any.
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pub fn find_inline_attr(diagnostic: Option<&Handler>, attrs: &[Attribute]) -> InlineAttr {
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attrs.iter().fold(InlineAttr::None, |ia, attr| {
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match attr.value.node {
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_ if attr.value.name != "inline" => ia,
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MetaItemKind::Word => {
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mark_used(attr);
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InlineAttr::Hint
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}
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MetaItemKind::List(ref items) => {
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mark_used(attr);
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if items.len() != 1 {
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diagnostic.map(|d|{ span_err!(d, attr.span, E0534, "expected one argument"); });
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InlineAttr::None
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} else if list_contains_name(&items[..], "always") {
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InlineAttr::Always
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} else if list_contains_name(&items[..], "never") {
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InlineAttr::Never
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} else {
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diagnostic.map(|d| {
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span_err!(d, items[0].span, E0535, "invalid argument");
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});
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InlineAttr::None
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}
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}
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_ => ia,
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}
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})
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}
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/// True if `#[inline]` or `#[inline(always)]` is present in `attrs`.
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pub fn requests_inline(attrs: &[Attribute]) -> bool {
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match find_inline_attr(None, attrs) {
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InlineAttr::Hint | InlineAttr::Always => true,
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InlineAttr::None | InlineAttr::Never => false,
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}
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}
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|
|
/// 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 {
|
|
let tag = attr.name();
|
|
if tag != "rustc_deprecated" && tag != "unstable" && tag != "stable" {
|
|
continue // not a stability level
|
|
}
|
|
|
|
mark_used(attr);
|
|
|
|
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, E0539, "incorrect meta item");
|
|
false
|
|
}
|
|
};
|
|
|
|
match &*tag.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.name() != "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)
|
|
}
|
|
|
|
pub fn require_unique_names(diagnostic: &Handler, metas: &[MetaItem]) {
|
|
let mut set = HashSet::new();
|
|
for meta in metas {
|
|
let name = meta.name();
|
|
|
|
if !set.insert(name.clone()) {
|
|
panic!(diagnostic.span_fatal(meta.span,
|
|
&format!("duplicate meta item `{}`", name)));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/// 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();
|
|
match attr.value.node {
|
|
ast::MetaItemKind::List(ref items) if attr.value.name == "repr" => {
|
|
mark_used(attr);
|
|
for item in items {
|
|
if !item.is_meta_item() {
|
|
handle_errors(diagnostic, item.span, AttrError::UnsupportedLiteral);
|
|
continue
|
|
}
|
|
|
|
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 => {
|
|
// Not a word we recognize
|
|
span_err!(diagnostic, item.span, E0552,
|
|
"unrecognized representation hint");
|
|
None
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some(h) = hint {
|
|
acc.push(h);
|
|
}
|
|
} else {
|
|
span_err!(diagnostic, item.span, E0553,
|
|
"unrecognized enum representation hint");
|
|
}
|
|
}
|
|
}
|
|
// Not a "repr" hint: ignore.
|
|
_ => { }
|
|
}
|
|
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)),
|
|
"isize" => Some(SignedInt(ast::IntTy::Is)),
|
|
"usize" => Some(UnsignedInt(ast::UintTy::Us)),
|
|
_ => None
|
|
}
|
|
}
|
|
|
|
#[derive(PartialEq, Debug, RustcEncodable, RustcDecodable, Copy, Clone)]
|
|
pub enum ReprAttr {
|
|
ReprAny,
|
|
ReprInt(IntType),
|
|
ReprExtern,
|
|
ReprPacked,
|
|
ReprSimd,
|
|
}
|
|
|
|
impl ReprAttr {
|
|
pub fn is_ffi_safe(&self) -> bool {
|
|
match *self {
|
|
ReprAny => false,
|
|
ReprInt(ity) => ity.is_ffi_safe(),
|
|
ReprExtern => true,
|
|
ReprPacked => false,
|
|
ReprSimd => true,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Eq, Hash, PartialEq, Debug, RustcEncodable, RustcDecodable, Copy, Clone)]
|
|
pub enum IntType {
|
|
SignedInt(ast::IntTy),
|
|
UnsignedInt(ast::UintTy)
|
|
}
|
|
|
|
impl IntType {
|
|
#[inline]
|
|
pub fn is_signed(self) -> bool {
|
|
match self {
|
|
SignedInt(..) => true,
|
|
UnsignedInt(..) => false
|
|
}
|
|
}
|
|
fn is_ffi_safe(self) -> bool {
|
|
match self {
|
|
SignedInt(ast::IntTy::I8) | UnsignedInt(ast::UintTy::U8) |
|
|
SignedInt(ast::IntTy::I16) | UnsignedInt(ast::UintTy::U16) |
|
|
SignedInt(ast::IntTy::I32) | UnsignedInt(ast::UintTy::U32) |
|
|
SignedInt(ast::IntTy::I64) | UnsignedInt(ast::UintTy::U64) => true,
|
|
SignedInt(ast::IntTy::Is) | UnsignedInt(ast::UintTy::Us) => false
|
|
}
|
|
}
|
|
}
|
|
|
|
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 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))
|
|
})),
|
|
}
|
|
}
|
|
}
|
|
|
|
macro_rules! derive_has_attrs_from_field {
|
|
($($ty:path),*) => { derive_has_attrs_from_field!($($ty: .attrs),*); };
|
|
($($ty:path : $(.$field:ident)*),*) => { $(
|
|
impl HasAttrs for $ty {
|
|
fn attrs(&self) -> &[Attribute] {
|
|
self $(.$field)* .attrs()
|
|
}
|
|
|
|
fn map_attrs<F>(mut self, f: F) -> Self
|
|
where F: FnOnce(Vec<Attribute>) -> Vec<Attribute>,
|
|
{
|
|
self $(.$field)* = self $(.$field)* .map_attrs(f);
|
|
self
|
|
}
|
|
}
|
|
)* }
|
|
}
|
|
|
|
derive_has_attrs_from_field! {
|
|
Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm
|
|
}
|
|
|
|
derive_has_attrs_from_field! { Stmt: .node, ast::Variant: .node.attrs }
|