108 lines
3.0 KiB
Rust
108 lines
3.0 KiB
Rust
//! checks for attributes
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use rustc::lint::*;
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use rustc_front::hir::*;
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use reexport::*;
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use syntax::codemap::Span;
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use syntax::attr::*;
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use syntax::ast::{Attribute, MetaList, MetaWord};
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use utils::{in_macro, match_path, span_lint};
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declare_lint! { pub INLINE_ALWAYS, Warn,
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"`#[inline(always)]` is a bad idea in most cases" }
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#[derive(Copy,Clone)]
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pub struct AttrPass;
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impl LintPass for AttrPass {
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fn get_lints(&self) -> LintArray {
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lint_array!(INLINE_ALWAYS)
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}
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}
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impl LateLintPass for AttrPass {
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fn check_item(&mut self, cx: &LateContext, item: &Item) {
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if is_relevant_item(item) {
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check_attrs(cx, item.span, &item.name, &item.attrs)
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}
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}
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fn check_impl_item(&mut self, cx: &LateContext, item: &ImplItem) {
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if is_relevant_impl(item) {
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check_attrs(cx, item.span, &item.name, &item.attrs)
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}
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}
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fn check_trait_item(&mut self, cx: &LateContext, item: &TraitItem) {
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if is_relevant_trait(item) {
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check_attrs(cx, item.span, &item.name, &item.attrs)
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}
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}
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}
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fn is_relevant_item(item: &Item) -> bool {
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if let &ItemFn(_, _, _, _, _, ref block) = &item.node {
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is_relevant_block(block)
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} else { false }
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}
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fn is_relevant_impl(item: &ImplItem) -> bool {
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match item.node {
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MethodImplItem(_, ref block) => is_relevant_block(block),
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_ => false
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}
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}
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fn is_relevant_trait(item: &TraitItem) -> bool {
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match item.node {
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MethodTraitItem(_, None) => true,
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MethodTraitItem(_, Some(ref block)) => is_relevant_block(block),
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_ => false
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}
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}
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fn is_relevant_block(block: &Block) -> bool {
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for stmt in &block.stmts {
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match stmt.node {
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StmtDecl(_, _) => return true,
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StmtExpr(ref expr, _) | StmtSemi(ref expr, _) => {
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return is_relevant_expr(expr);
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}
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}
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}
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block.expr.as_ref().map_or(false, |e| is_relevant_expr(e))
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}
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fn is_relevant_expr(expr: &Expr) -> bool {
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match expr.node {
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ExprBlock(ref block) => is_relevant_block(block),
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ExprRet(Some(ref e)) => is_relevant_expr(e),
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ExprRet(None) | ExprBreak(_) => false,
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ExprCall(ref path_expr, _) => {
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if let ExprPath(_, ref path) = path_expr.node {
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!match_path(path, &["std", "rt", "begin_unwind"])
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} else { true }
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}
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_ => true
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}
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}
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fn check_attrs(cx: &LateContext, span: Span, name: &Name,
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attrs: &[Attribute]) {
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if in_macro(cx, span) { return; }
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for attr in attrs {
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if let MetaList(ref inline, ref values) = attr.node.value.node {
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if values.len() != 1 || inline != &"inline" { continue; }
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if let MetaWord(ref always) = values[0].node {
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if always != &"always" { continue; }
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span_lint(cx, INLINE_ALWAYS, attr.span, &format!(
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"you have declared `#[inline(always)]` on `{}`. This \
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is usually a bad idea. Are you sure?",
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name));
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}
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}
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}
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}
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