567 lines
20 KiB
Rust
567 lines
20 KiB
Rust
use rustc::lint::*;
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use rustc_front::hir::*;
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use reexport::*;
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use syntax::codemap::{ExpnInfo, Span, ExpnFormat};
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use rustc::front::map::Node::*;
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use rustc::middle::def_id::DefId;
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use rustc::middle::ty;
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use std::borrow::Cow;
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use syntax::ast::Lit_::*;
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use syntax::ast;
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use syntax::errors::DiagnosticBuilder;
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use syntax::ptr::P;
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use consts::constant;
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use rustc::session::Session;
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use std::str::FromStr;
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use std::ops::{Deref, DerefMut};
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pub type MethodArgs = HirVec<P<Expr>>;
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// module DefPaths for certain structs/enums we check for
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pub const OPTION_PATH: [&'static str; 3] = ["core", "option", "Option"];
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pub const RESULT_PATH: [&'static str; 3] = ["core", "result", "Result"];
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pub const STRING_PATH: [&'static str; 3] = ["collections", "string", "String"];
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pub const VEC_PATH: [&'static str; 3] = ["collections", "vec", "Vec"];
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pub const LL_PATH: [&'static str; 3] = ["collections", "linked_list", "LinkedList"];
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pub const HASHMAP_PATH: [&'static str; 5] = ["std", "collections", "hash", "map", "HashMap"];
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pub const OPEN_OPTIONS_PATH: [&'static str; 3] = ["std", "fs", "OpenOptions"];
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pub const MUTEX_PATH: [&'static str; 4] = ["std", "sync", "mutex", "Mutex"];
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pub const CLONE_PATH: [&'static str; 2] = ["Clone", "clone"];
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pub const BEGIN_UNWIND: [&'static str; 3] = ["std", "rt", "begin_unwind"];
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pub const COW_PATH: [&'static str; 3] = ["collections", "borrow", "Cow"];
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/// Produce a nested chain of if-lets and ifs from the patterns:
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///
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/// if_let_chain! {
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/// [
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/// let Some(y) = x,
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/// y.len() == 2,
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/// let Some(z) = y,
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/// ],
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/// {
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/// block
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/// }
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/// }
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///
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/// becomes
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///
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/// if let Some(y) = x {
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/// if y.len() == 2 {
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/// if let Some(z) = y {
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/// block
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/// }
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/// }
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/// }
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#[macro_export]
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macro_rules! if_let_chain {
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([let $pat:pat = $expr:expr, $($tt:tt)+], $block:block) => {
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if let $pat = $expr {
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if_let_chain!{ [$($tt)+], $block }
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}
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};
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([let $pat:pat = $expr:expr], $block:block) => {
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if let $pat = $expr {
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$block
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}
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};
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([$expr:expr, $($tt:tt)+], $block:block) => {
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if $expr {
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if_let_chain!{ [$($tt)+], $block }
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}
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};
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([$expr:expr], $block:block) => {
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if $expr {
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$block
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}
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};
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}
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/// Returns true if the two spans come from differing expansions (i.e. one is from a macro and one isn't)
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pub fn differing_macro_contexts(sp1: Span, sp2: Span) -> bool {
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sp1.expn_id != sp2.expn_id
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}
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/// returns true if this expn_info was expanded by any macro
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pub fn in_macro<T: LintContext>(cx: &T, span: Span) -> bool {
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cx.sess().codemap().with_expn_info(span.expn_id, |info| info.is_some())
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}
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/// returns true if the macro that expanded the crate was outside of
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/// the current crate or was a compiler plugin
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pub fn in_external_macro<T: LintContext>(cx: &T, span: Span) -> bool {
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/// invokes in_macro with the expansion info of the given span
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/// slightly heavy, try to use this after other checks have already happened
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fn in_macro_ext<T: LintContext>(cx: &T, opt_info: Option<&ExpnInfo>) -> bool {
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// no ExpnInfo = no macro
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opt_info.map_or(false, |info| {
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if let ExpnFormat::MacroAttribute(..) = info.callee.format {
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// these are all plugins
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return true;
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}
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// no span for the callee = external macro
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info.callee.span.map_or(true, |span| {
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// no snippet = external macro or compiler-builtin expansion
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cx.sess().codemap().span_to_snippet(span).ok().map_or(true, |code| !code.starts_with("macro_rules"))
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})
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})
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}
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cx.sess().codemap().with_expn_info(span.expn_id, |info| in_macro_ext(cx, info))
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}
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/// check if a DefId's path matches the given absolute type path
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/// usage e.g. with
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/// `match_def_path(cx, id, &["core", "option", "Option"])`
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pub fn match_def_path(cx: &LateContext, def_id: DefId, path: &[&str]) -> bool {
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cx.tcx.with_path(def_id, |iter| {
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iter.zip(path)
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.all(|(nm, p)| nm.name().as_str() == *p)
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})
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}
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/// check if type is struct or enum type with given def path
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pub fn match_type(cx: &LateContext, ty: ty::Ty, path: &[&str]) -> bool {
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match ty.sty {
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ty::TyEnum(ref adt, _) | ty::TyStruct(ref adt, _) => match_def_path(cx, adt.did, path),
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_ => false,
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}
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}
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/// check if method call given in "expr" belongs to given trait
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pub fn match_impl_method(cx: &LateContext, expr: &Expr, path: &[&str]) -> bool {
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let method_call = ty::MethodCall::expr(expr.id);
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let trt_id = cx.tcx
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.tables
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.borrow()
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.method_map
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.get(&method_call)
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.and_then(|callee| cx.tcx.impl_of_method(callee.def_id));
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if let Some(trt_id) = trt_id {
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match_def_path(cx, trt_id, path)
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} else {
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false
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}
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}
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/// check if method call given in "expr" belongs to given trait
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pub fn match_trait_method(cx: &LateContext, expr: &Expr, path: &[&str]) -> bool {
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let method_call = ty::MethodCall::expr(expr.id);
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let trt_id = cx.tcx
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.tables
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.borrow()
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.method_map
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.get(&method_call)
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.and_then(|callee| cx.tcx.trait_of_item(callee.def_id));
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if let Some(trt_id) = trt_id {
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match_def_path(cx, trt_id, path)
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} else {
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false
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}
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}
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/// match a Path against a slice of segment string literals, e.g.
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/// `match_path(path, &["std", "rt", "begin_unwind"])`
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pub fn match_path(path: &Path, segments: &[&str]) -> bool {
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path.segments.iter().rev().zip(segments.iter().rev()).all(|(a, b)| a.identifier.name.as_str() == *b)
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}
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/// match a Path against a slice of segment string literals, e.g.
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/// `match_path(path, &["std", "rt", "begin_unwind"])`
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pub fn match_path_ast(path: &ast::Path, segments: &[&str]) -> bool {
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path.segments.iter().rev().zip(segments.iter().rev()).all(|(a, b)| a.identifier.name.as_str() == *b)
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}
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/// match an Expr against a chain of methods, and return the matched Exprs. For example, if `expr`
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/// represents the `.baz()` in `foo.bar().baz()`, `matched_method_chain(expr, &["bar", "baz"])`
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/// will return a Vec containing the Exprs for `.bar()` and `.baz()`
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pub fn method_chain_args<'a>(expr: &'a Expr, methods: &[&str]) -> Option<Vec<&'a MethodArgs>> {
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let mut current = expr;
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let mut matched = Vec::with_capacity(methods.len());
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for method_name in methods.iter().rev() {
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// method chains are stored last -> first
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if let ExprMethodCall(ref name, _, ref args) = current.node {
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if name.node.as_str() == *method_name {
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matched.push(args); // build up `matched` backwards
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current = &args[0] // go to parent expression
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} else {
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return None;
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}
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} else {
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return None;
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}
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}
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matched.reverse(); // reverse `matched`, so that it is in the same order as `methods`
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Some(matched)
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}
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/// get the name of the item the expression is in, if available
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pub fn get_item_name(cx: &LateContext, expr: &Expr) -> Option<Name> {
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let parent_id = cx.tcx.map.get_parent(expr.id);
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match cx.tcx.map.find(parent_id) {
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Some(NodeItem(&Item{ ref name, .. })) |
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Some(NodeTraitItem(&TraitItem{ ref name, .. })) |
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Some(NodeImplItem(&ImplItem{ ref name, .. })) => Some(*name),
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_ => None,
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}
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}
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/// checks if a `let` decl is from a for loop desugaring
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pub fn is_from_for_desugar(decl: &Decl) -> bool {
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if_let_chain! {
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[
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let DeclLocal(ref loc) = decl.node,
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let Some(ref expr) = loc.init,
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let ExprMatch(_, _, MatchSource::ForLoopDesugar) = expr.node
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],
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{ return true; }
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};
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false
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}
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/// convert a span to a code snippet if available, otherwise use default, e.g.
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/// `snippet(cx, expr.span, "..")`
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pub fn snippet<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
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cx.sess().codemap().span_to_snippet(span).map(From::from).unwrap_or(Cow::Borrowed(default))
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}
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/// Converts a span to a code snippet. Returns None if not available.
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pub fn snippet_opt<T: LintContext>(cx: &T, span: Span) -> Option<String> {
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cx.sess().codemap().span_to_snippet(span).ok()
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}
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/// convert a span (from a block) to a code snippet if available, otherwise use default, e.g.
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/// `snippet(cx, expr.span, "..")`
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/// This trims the code of indentation, except for the first line
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/// Use it for blocks or block-like things which need to be printed as such
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pub fn snippet_block<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
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let snip = snippet(cx, span, default);
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trim_multiline(snip, true)
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}
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/// Like snippet_block, but add braces if the expr is not an ExprBlock
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/// Also takes an Option<String> which can be put inside the braces
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pub fn expr_block<'a, T: LintContext>(cx: &T, expr: &Expr, option: Option<String>, default: &'a str) -> Cow<'a, str> {
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let code = snippet_block(cx, expr.span, default);
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let string = option.map_or("".to_owned(), |s| s);
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if let ExprBlock(_) = expr.node {
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Cow::Owned(format!("{}{}", code, string))
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} else if string.is_empty() {
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Cow::Owned(format!("{{ {} }}", code))
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} else {
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Cow::Owned(format!("{{\n{};\n{}\n}}", code, string))
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}
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}
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/// Trim indentation from a multiline string
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/// with possibility of ignoring the first line
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pub fn trim_multiline(s: Cow<str>, ignore_first: bool) -> Cow<str> {
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let s_space = trim_multiline_inner(s, ignore_first, ' ');
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let s_tab = trim_multiline_inner(s_space, ignore_first, '\t');
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trim_multiline_inner(s_tab, ignore_first, ' ')
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}
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fn trim_multiline_inner(s: Cow<str>, ignore_first: bool, ch: char) -> Cow<str> {
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let x = s.lines()
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.skip(ignore_first as usize)
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.filter_map(|l| {
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if l.len() > 0 {
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// ignore empty lines
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Some(l.char_indices()
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.find(|&(_, x)| x != ch)
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.unwrap_or((l.len(), ch))
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.0)
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} else {
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None
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}
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})
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.min()
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.unwrap_or(0);
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if x > 0 {
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Cow::Owned(s.lines()
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.enumerate()
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.map(|(i, l)| {
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if (ignore_first && i == 0) || l.len() == 0 {
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l
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} else {
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l.split_at(x).1
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}
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})
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.collect::<Vec<_>>()
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.join("\n"))
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} else {
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s
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}
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}
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/// get a parent expr if any – this is useful to constrain a lint
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pub fn get_parent_expr<'c>(cx: &'c LateContext, e: &Expr) -> Option<&'c Expr> {
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let map = &cx.tcx.map;
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let node_id: NodeId = e.id;
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let parent_id: NodeId = map.get_parent_node(node_id);
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if node_id == parent_id {
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return None;
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}
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map.find(parent_id).and_then(|node| {
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if let NodeExpr(parent) = node {
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Some(parent)
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} else {
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None
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}
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})
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}
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pub fn get_enclosing_block<'c>(cx: &'c LateContext, node: NodeId) -> Option<&'c Block> {
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let map = &cx.tcx.map;
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let enclosing_node = map.get_enclosing_scope(node)
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.and_then(|enclosing_id| map.find(enclosing_id));
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if let Some(node) = enclosing_node {
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match node {
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NodeBlock(ref block) => Some(block),
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NodeItem(&Item{ node: ItemFn(_, _, _, _, _, ref block), .. }) => Some(block),
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_ => None,
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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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pub struct DiagnosticWrapper<'a>(pub DiagnosticBuilder<'a>);
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impl<'a> Drop for DiagnosticWrapper<'a> {
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fn drop(&mut self) {
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self.0.emit();
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}
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}
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impl<'a> DerefMut for DiagnosticWrapper<'a> {
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fn deref_mut(&mut self) -> &mut DiagnosticBuilder<'a> {
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&mut self.0
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}
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}
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impl<'a> Deref for DiagnosticWrapper<'a> {
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type Target = DiagnosticBuilder<'a>;
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fn deref(&self) -> &DiagnosticBuilder<'a> {
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&self.0
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}
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}
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#[cfg(not(feature="structured_logging"))]
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pub fn span_lint<'a, T: LintContext>(cx: &'a T, lint: &'static Lint, sp: Span, msg: &str) -> DiagnosticWrapper<'a> {
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let mut db = cx.struct_span_lint(lint, sp, msg);
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if cx.current_level(lint) != Level::Allow {
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db.fileline_help(sp,
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&format!("for further information visit https://github.com/Manishearth/rust-clippy/wiki#{}",
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lint.name_lower()));
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}
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DiagnosticWrapper(db)
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}
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#[cfg(feature="structured_logging")]
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pub fn span_lint<'a, T: LintContext>(cx: &'a T, lint: &'static Lint, sp: Span, msg: &str) -> DiagnosticWrapper<'a> {
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// lint.name / lint.desc is can give details of the lint
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// cx.sess().codemap() has all these nice functions for line/column/snippet details
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// http://doc.rust-lang.org/syntax/codemap/struct.CodeMap.html#method.span_to_string
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let mut db = cx.struct_span_lint(lint, sp, msg);
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if cx.current_level(lint) != Level::Allow {
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db.fileline_help(sp,
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&format!("for further information visit https://github.com/Manishearth/rust-clippy/wiki#{}",
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lint.name_lower()));
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}
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DiagnosticWrapper(db)
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}
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pub fn span_help_and_lint<'a, T: LintContext>(cx: &'a T, lint: &'static Lint, span: Span, msg: &str, help: &str)
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-> DiagnosticWrapper<'a> {
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let mut db = cx.struct_span_lint(lint, span, msg);
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if cx.current_level(lint) != Level::Allow {
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db.fileline_help(span,
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&format!("{}\nfor further information visit \
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https://github.com/Manishearth/rust-clippy/wiki#{}",
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help,
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lint.name_lower()));
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}
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DiagnosticWrapper(db)
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}
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pub fn span_note_and_lint<'a, T: LintContext>(cx: &'a T, lint: &'static Lint, span: Span, msg: &str, note_span: Span,
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note: &str)
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-> DiagnosticWrapper<'a> {
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let mut db = cx.struct_span_lint(lint, span, msg);
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if cx.current_level(lint) != Level::Allow {
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if note_span == span {
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db.fileline_note(note_span, note);
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} else {
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db.span_note(note_span, note);
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}
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db.fileline_help(span,
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&format!("for further information visit https://github.com/Manishearth/rust-clippy/wiki#{}",
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lint.name_lower()));
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}
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DiagnosticWrapper(db)
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}
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pub fn span_lint_and_then<'a, T: LintContext, F>(cx: &'a T, lint: &'static Lint, sp: Span, msg: &str, f: F)
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-> DiagnosticWrapper<'a>
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where F: Fn(&mut DiagnosticWrapper)
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{
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let mut db = DiagnosticWrapper(cx.struct_span_lint(lint, sp, msg));
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if cx.current_level(lint) != Level::Allow {
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f(&mut db);
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db.fileline_help(sp,
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&format!("for further information visit https://github.com/Manishearth/rust-clippy/wiki#{}",
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lint.name_lower()));
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}
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db
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}
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/// return the base type for references and raw pointers
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pub fn walk_ptrs_ty(ty: ty::Ty) -> ty::Ty {
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match ty.sty {
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ty::TyRef(_, ref tm) | ty::TyRawPtr(ref tm) => walk_ptrs_ty(tm.ty),
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_ => ty,
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}
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}
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/// return the base type for references and raw pointers, and count reference depth
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pub fn walk_ptrs_ty_depth(ty: ty::Ty) -> (ty::Ty, usize) {
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fn inner(ty: ty::Ty, depth: usize) -> (ty::Ty, usize) {
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match ty.sty {
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ty::TyRef(_, ref tm) | ty::TyRawPtr(ref tm) => inner(tm.ty, depth + 1),
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_ => (ty, depth),
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}
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}
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inner(ty, 0)
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}
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pub fn is_integer_literal(expr: &Expr, value: u64) -> bool {
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// FIXME: use constant folding
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if let ExprLit(ref spanned) = expr.node {
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if let LitInt(v, _) = spanned.node {
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return v == value;
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}
|
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}
|
||
false
|
||
}
|
||
|
||
pub fn is_adjusted(cx: &LateContext, e: &Expr) -> bool {
|
||
cx.tcx.tables.borrow().adjustments.get(&e.id).is_some()
|
||
}
|
||
|
||
pub struct LimitStack {
|
||
stack: Vec<u64>,
|
||
}
|
||
|
||
impl Drop for LimitStack {
|
||
fn drop(&mut self) {
|
||
assert_eq!(self.stack.len(), 1);
|
||
}
|
||
}
|
||
|
||
impl LimitStack {
|
||
pub fn new(limit: u64) -> LimitStack {
|
||
LimitStack { stack: vec![limit] }
|
||
}
|
||
pub fn limit(&self) -> u64 {
|
||
*self.stack.last().expect("there should always be a value in the stack")
|
||
}
|
||
pub fn push_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
|
||
let stack = &mut self.stack;
|
||
parse_attrs(sess, attrs, name, |val| stack.push(val));
|
||
}
|
||
pub fn pop_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
|
||
let stack = &mut self.stack;
|
||
parse_attrs(sess, attrs, name, |val| assert_eq!(stack.pop(), Some(val)));
|
||
}
|
||
}
|
||
|
||
fn parse_attrs<F: FnMut(u64)>(sess: &Session, attrs: &[ast::Attribute], name: &'static str, mut f: F) {
|
||
for attr in attrs {
|
||
let attr = &attr.node;
|
||
if attr.is_sugared_doc {
|
||
continue;
|
||
}
|
||
if let ast::MetaNameValue(ref key, ref value) = attr.value.node {
|
||
if *key == name {
|
||
if let LitStr(ref s, _) = value.node {
|
||
if let Ok(value) = FromStr::from_str(s) {
|
||
f(value)
|
||
} else {
|
||
sess.span_err(value.span, "not a number");
|
||
}
|
||
} else {
|
||
unreachable!()
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
pub fn is_exp_equal(cx: &LateContext, left: &Expr, right: &Expr) -> bool {
|
||
if let (Some(l), Some(r)) = (constant(cx, left), constant(cx, right)) {
|
||
if l == r {
|
||
return true;
|
||
}
|
||
}
|
||
match (&left.node, &right.node) {
|
||
(&ExprField(ref lfexp, ref lfident), &ExprField(ref rfexp, ref rfident)) => {
|
||
lfident.node == rfident.node && is_exp_equal(cx, lfexp, rfexp)
|
||
}
|
||
(&ExprLit(ref l), &ExprLit(ref r)) => l.node == r.node,
|
||
(&ExprPath(ref lqself, ref lsubpath), &ExprPath(ref rqself, ref rsubpath)) => {
|
||
both(lqself, rqself, is_qself_equal) && is_path_equal(lsubpath, rsubpath)
|
||
}
|
||
(&ExprTup(ref ltup), &ExprTup(ref rtup)) => is_exps_equal(cx, ltup, rtup),
|
||
(&ExprVec(ref l), &ExprVec(ref r)) => is_exps_equal(cx, l, r),
|
||
(&ExprCast(ref lx, ref lt), &ExprCast(ref rx, ref rt)) => is_exp_equal(cx, lx, rx) && is_cast_ty_equal(lt, rt),
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
fn is_exps_equal(cx: &LateContext, left: &[P<Expr>], right: &[P<Expr>]) -> bool {
|
||
over(left, right, |l, r| is_exp_equal(cx, l, r))
|
||
}
|
||
|
||
fn is_path_equal(left: &Path, right: &Path) -> bool {
|
||
// The == of idents doesn't work with different contexts,
|
||
// we have to be explicit about hygiene
|
||
left.global == right.global &&
|
||
over(&left.segments,
|
||
&right.segments,
|
||
|l, r| l.identifier.name == r.identifier.name && l.parameters == r.parameters)
|
||
}
|
||
|
||
fn is_qself_equal(left: &QSelf, right: &QSelf) -> bool {
|
||
left.ty.node == right.ty.node && left.position == right.position
|
||
}
|
||
|
||
fn over<X, F>(left: &[X], right: &[X], mut eq_fn: F) -> bool
|
||
where F: FnMut(&X, &X) -> bool
|
||
{
|
||
left.len() == right.len() && left.iter().zip(right).all(|(x, y)| eq_fn(x, y))
|
||
}
|
||
|
||
fn both<X, F>(l: &Option<X>, r: &Option<X>, mut eq_fn: F) -> bool
|
||
where F: FnMut(&X, &X) -> bool
|
||
{
|
||
l.as_ref().map_or_else(|| r.is_none(), |x| r.as_ref().map_or(false, |y| eq_fn(x, y)))
|
||
}
|
||
|
||
fn is_cast_ty_equal(left: &Ty, right: &Ty) -> bool {
|
||
match (&left.node, &right.node) {
|
||
(&TyVec(ref lvec), &TyVec(ref rvec)) => is_cast_ty_equal(lvec, rvec),
|
||
(&TyPtr(ref lmut), &TyPtr(ref rmut)) => lmut.mutbl == rmut.mutbl && is_cast_ty_equal(&*lmut.ty, &*rmut.ty),
|
||
(&TyRptr(_, ref lrmut), &TyRptr(_, ref rrmut)) => {
|
||
lrmut.mutbl == rrmut.mutbl && is_cast_ty_equal(&*lrmut.ty, &*rrmut.ty)
|
||
}
|
||
(&TyPath(ref lq, ref lpath), &TyPath(ref rq, ref rpath)) => {
|
||
both(lq, rq, is_qself_equal) && is_path_equal(lpath, rpath)
|
||
}
|
||
(&TyInfer, &TyInfer) => true,
|
||
_ => false,
|
||
}
|
||
}
|