Clean up and document the public lint API
Also change some code formatting. lint::builtin becomes a sibling of lint::context in order to ensure that lints implemented there use the same public API as lint plugins.
This commit is contained in:
parent
819f76ca82
commit
c7af6060dd
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@ -384,7 +384,7 @@ pub fn phase_3_run_analysis_passes(sess: Session,
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});
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time(time_passes, "lint checking", (), |_|
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lint::check_crate(&ty_cx, &exported_items, krate));
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lint::check_crate(&ty_cx, krate, &exported_items));
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CrateAnalysis {
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exp_map2: exp_map2,
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@ -9,18 +9,31 @@
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// except according to those terms.
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//! Lints built in to rustc.
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//!
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//! This is a sibling of `lint::context` in order to ensure that
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//! lints implemented here use the same public API as lint plugins.
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//!
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//! To add a new lint to rustc, declare it here using `declare_lint!()`.
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//! Then add code to emit the new lint in the appropriate circumstances.
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//! You can do that in an existing `LintPass` if it makes sense, or in
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//! a new `LintPass`, or using `Session::add_lint` elsewhere in the
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//! compiler. Only do the latter if the check can't be written cleanly
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//! as a `LintPass`.
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//!
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//! If you define a new `LintPass`, you will also need to add it to the
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//! `add_builtin_lints!()` invocation in `context.rs`. That macro
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//! requires a `Default` impl for your `LintPass` type.
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use metadata::csearch;
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use middle::def::*;
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use middle::trans::adt; // for `adt::is_ffi_safe`
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use middle::typeck::astconv::{ast_ty_to_ty, AstConv};
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use middle::typeck::astconv::ast_ty_to_ty;
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use middle::typeck::infer;
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use middle::privacy::ExportedItems;
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use middle::{typeck, ty, def, pat_util};
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use util::ppaux::{ty_to_str};
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use util::nodemap::NodeSet;
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use lint::{Context, LintPass, LintArray};
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use lint;
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use std::cmp;
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use std::collections::HashMap;
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@ -169,7 +182,7 @@ impl LintPass for TypeLimits {
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match ty::get(ty::expr_ty(cx.tcx, e)).sty {
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ty::ty_int(t) => {
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let int_type = if t == ast::TyI {
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cx.tcx.sess.targ_cfg.int_type
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cx.sess().targ_cfg.int_type
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} else { t };
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let (min, max) = int_ty_range(int_type);
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let mut lit_val: i64 = match lit.node {
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@ -188,7 +201,7 @@ impl LintPass for TypeLimits {
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},
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ty::ty_uint(t) => {
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let uint_type = if t == ast::TyU {
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cx.tcx.sess.targ_cfg.uint_type
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cx.sess().targ_cfg.uint_type
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} else { t };
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let (min, max) = uint_ty_range(uint_type);
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let lit_val: u64 = match lit.node {
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@ -430,9 +443,9 @@ impl LintPass for HeapMemory {
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ast::ItemFn(..) |
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ast::ItemTy(..) |
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ast::ItemEnum(..) |
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ast::ItemStruct(..) => self.check_heap_type(cx, it.span,
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ty::node_id_to_type(cx.tcx,
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it.id)),
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ast::ItemStruct(..)
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=> self.check_heap_type(cx, it.span,
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ty::node_id_to_type(cx.tcx, it.id)),
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_ => ()
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}
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@ -441,8 +454,7 @@ impl LintPass for HeapMemory {
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ast::ItemStruct(struct_def, _) => {
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for struct_field in struct_def.fields.iter() {
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self.check_heap_type(cx, struct_field.span,
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ty::node_id_to_type(cx.tcx,
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struct_field.node.id));
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ty::node_id_to_type(cx.tcx, struct_field.node.id));
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}
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}
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_ => ()
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@ -677,7 +689,7 @@ impl LintPass for UnusedResult {
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_ => {}
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}
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} else {
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csearch::get_item_attrs(&cx.tcx.sess.cstore, did, |attrs| {
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csearch::get_item_attrs(&cx.sess().cstore, did, |attrs| {
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if attr::contains_name(attrs.as_slice(), "must_use") {
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cx.span_lint(unused_must_use, s.span,
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"unused result which must be used");
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@ -711,7 +723,7 @@ impl LintPass for DeprecatedOwnedVector {
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ty::ty_uniq(t) => match ty::get(t).sty {
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ty::ty_vec(_, None) => {
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cx.span_lint(deprecated_owned_vector, e.span,
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"use of deprecated `~[]` vector; replaced by `std::vec::Vec`")
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"use of deprecated `~[]` vector; replaced by `std::vec::Vec`")
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}
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_ => {}
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},
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@ -791,7 +803,7 @@ fn method_context(cx: &Context, m: &ast::Method) -> MethodContext {
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};
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match cx.tcx.methods.borrow().find_copy(&did) {
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None => cx.tcx.sess.span_bug(m.span, "missing method descriptor?!"),
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None => cx.sess().span_bug(m.span, "missing method descriptor?!"),
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Some(md) => {
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match md.container {
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ty::TraitContainer(..) => TraitDefaultImpl,
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@ -1110,15 +1122,14 @@ impl UnusedMut {
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match mode {
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ast::BindByValue(ast::MutMutable) => {
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if path.segments.len() != 1 {
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cx.tcx.sess.span_bug(p.span,
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cx.sess().span_bug(p.span,
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"mutable binding that doesn't consist \
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of exactly one segment");
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}
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let ident = path.segments.get(0).identifier;
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if !token::get_ident(ident).get().starts_with("_") {
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mutables.insert_or_update_with(ident.name as uint, vec!(id), |_, old| {
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old.push(id);
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});
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mutables.insert_or_update_with(ident.name as uint,
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vec!(id), |_, old| { old.push(id); });
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}
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}
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_ => {
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@ -1279,7 +1290,7 @@ impl MissingDoc {
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desc: &'static str) {
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// If we're building a test harness, then warning about
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// documentation is probably not really relevant right now.
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if cx.tcx.sess.opts.test { return }
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if cx.sess().opts.test { return }
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// `#[doc(hidden)]` disables missing_doc check.
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if self.doc_hidden() { return }
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@ -1358,7 +1369,8 @@ impl LintPass for MissingDoc {
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}
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fn check_fn(&mut self, cx: &Context,
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fk: &visit::FnKind, _: &ast::FnDecl, _: &ast::Block, _: Span, _: ast::NodeId) {
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fk: &visit::FnKind, _: &ast::FnDecl,
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_: &ast::Block, _: Span, _: ast::NodeId) {
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match *fk {
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visit::FkMethod(_, _, m) => {
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// If the method is an impl for a trait, don't doc.
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@ -1381,7 +1393,8 @@ impl LintPass for MissingDoc {
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fn check_struct_field(&mut self, cx: &Context, sf: &ast::StructField) {
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match sf.node.kind {
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ast::NamedField(_, vis) if vis == ast::Public => {
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let cur_struct_def = *self.struct_def_stack.last().expect("empty struct_def_stack");
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let cur_struct_def = *self.struct_def_stack.last()
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.expect("empty struct_def_stack");
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self.check_missing_doc_attrs(cx, Some(cur_struct_def),
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sf.node.attrs.as_slice(), sf.span, "a struct field")
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}
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@ -1404,8 +1417,8 @@ declare_lint!(experimental, Warn,
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declare_lint!(unstable, Allow,
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"detects use of #[unstable] items (incl. items with no stability attribute)")
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/// Checks for use of items with #[deprecated], #[experimental] and
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/// #[unstable] (or none of them) attributes.
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/// Checks for use of items with `#[deprecated]`, `#[experimental]` and
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/// `#[unstable]` attributes, or no stability attribute.
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#[deriving(Default)]
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pub struct Stability;
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@ -1472,7 +1485,7 @@ impl LintPass for Stability {
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let mut s = None;
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// run through all the attributes and take the first
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// stability one.
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csearch::get_item_attrs(&cx.tcx.sess.cstore, id, |attrs| {
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csearch::get_item_attrs(&cx.sess().cstore, id, |attrs| {
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if s.is_none() {
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s = attr::find_stability(attrs.as_slice())
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}
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@ -1503,32 +1516,6 @@ impl LintPass for Stability {
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}
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}
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/// Doesn't actually warn; just gathers information for use by
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/// checks in trans.
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#[deriving(Default)]
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pub struct GatherNodeLevels;
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impl LintPass for GatherNodeLevels {
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fn get_lints(&self) -> LintArray {
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lint_array!()
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}
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fn check_item(&mut self, cx: &Context, it: &ast::Item) {
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match it.node {
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ast::ItemEnum(..) => {
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let lint_id = lint::LintId::of(variant_size_difference);
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match cx.lints.get_level_source(lint_id) {
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lvlsrc @ (lvl, _) if lvl != lint::Allow => {
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cx.insert_node_level(it.id, lint_id, lvlsrc);
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},
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_ => { }
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}
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},
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_ => { }
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}
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}
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}
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declare_lint!(pub unused_imports, Warn,
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"imports that are never used")
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@ -0,0 +1,628 @@
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// 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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//! Implementation of lint checking.
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//!
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//! The lint checking is mostly consolidated into one pass which runs just
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//! before translation to LLVM bytecode. Throughout compilation, lint warnings
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//! can be added via the `add_lint` method on the Session structure. This
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//! requires a span and an id of the node that the lint is being added to. The
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//! lint isn't actually emitted at that time because it is unknown what the
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//! actual lint level at that location is.
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//!
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//! To actually emit lint warnings/errors, a separate pass is used just before
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//! translation. A context keeps track of the current state of all lint levels.
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//! Upon entering a node of the ast which can modify the lint settings, the
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//! previous lint state is pushed onto a stack and the ast is then recursed
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//! upon. As the ast is traversed, this keeps track of the current lint level
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//! for all lint attributes.
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use middle::privacy::ExportedItems;
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use middle::ty;
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use middle::typeck::astconv::AstConv;
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use middle::typeck::infer;
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use driver::session::Session;
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use driver::early_error;
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use lint::{Level, LevelSource, Lint, LintId, LintArray, LintPass, LintPassObject};
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use lint::{Default, CommandLine, Node, Allow, Warn, Deny, Forbid};
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use lint::builtin;
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use std::collections::HashMap;
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use std::rc::Rc;
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use std::cell::RefCell;
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use std::default::Default;
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use std::tuple::Tuple2;
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use std::mem;
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use syntax::ast_util::IdVisitingOperation;
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use syntax::attr::AttrMetaMethods;
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use syntax::attr;
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use syntax::codemap::Span;
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use syntax::visit::{Visitor, FnKind};
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use syntax::{ast, ast_util, visit};
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/// Information about the registered lints.
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///
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/// This is basically the subset of `Context` that we can
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/// build early in the compile pipeline.
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pub struct LintStore {
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/// Registered lints. The bool is true if the lint was
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/// added by a plugin.
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lints: Vec<(&'static Lint, bool)>,
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/// Trait objects for each lint pass.
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passes: Vec<RefCell<LintPassObject>>,
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/// Lints indexed by name.
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by_name: HashMap<&'static str, LintId>,
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/// Current levels of each lint, and where they were set.
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levels: HashMap<LintId, LevelSource>,
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}
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impl LintStore {
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fn get_level_source(&self, lint: LintId) -> LevelSource {
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match self.levels.find(&lint) {
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Some(&s) => s,
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None => (Allow, Default),
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}
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}
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fn set_level(&mut self, lint: LintId, lvlsrc: LevelSource) {
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if lvlsrc.val0() == Allow {
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self.levels.remove(&lint);
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} else {
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self.levels.insert(lint, lvlsrc);
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}
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}
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pub fn new() -> LintStore {
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LintStore {
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lints: vec!(),
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passes: vec!(),
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by_name: HashMap::new(),
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levels: HashMap::new(),
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}
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}
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pub fn get_lints<'t>(&'t self) -> &'t [(&'static Lint, bool)] {
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self.lints.as_slice()
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}
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pub fn register_pass(&mut self, sess: Option<&Session>,
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from_plugin: bool, pass: LintPassObject) {
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for &lint in pass.get_lints().iter() {
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self.lints.push((lint, from_plugin));
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let id = LintId::of(lint);
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if !self.by_name.insert(lint.name, id) {
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let msg = format!("duplicate specification of lint {}", lint.name);
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match (sess, from_plugin) {
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// We load builtin lints first, so a duplicate is a compiler bug.
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// Use early_error when handling -W help with no crate.
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(None, _) => early_error(msg.as_slice()),
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(Some(sess), false) => sess.bug(msg.as_slice()),
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// A duplicate name from a plugin is a user error.
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(Some(sess), true) => sess.err(msg.as_slice()),
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}
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}
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if lint.default_level != Allow {
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self.levels.insert(id, (lint.default_level, Default));
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}
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}
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self.passes.push(RefCell::new(pass));
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}
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pub fn register_builtin(&mut self, sess: Option<&Session>) {
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macro_rules! add_builtin_lints ( ( $sess:ident, $($name:ident),*, ) => (
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{$(
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{
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let obj: builtin::$name = Default::default();
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self.register_pass($sess, false, box obj as LintPassObject);
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};
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)*}
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))
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add_builtin_lints!(sess, HardwiredLints,
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WhileTrue, UnusedCasts, TypeLimits, CTypes, HeapMemory,
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RawPointerDeriving, UnusedAttribute, PathStatement,
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UnusedResult, DeprecatedOwnedVector, NonCamelCaseTypes,
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NonSnakeCaseFunctions, NonUppercaseStatics,
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NonUppercasePatternStatics, UppercaseVariables,
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UnnecessaryParens, UnusedUnsafe, UnsafeBlock, UnusedMut,
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UnnecessaryAllocation, MissingDoc, Stability,
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)
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// We have one lint pass defined in this module.
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self.register_pass(sess, false, box GatherNodeLevels as LintPassObject);
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}
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pub fn process_command_line(&mut self, sess: &Session) {
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for &(ref lint_name, level) in sess.opts.lint_opts.iter() {
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match self.by_name.find_equiv(&lint_name.as_slice()) {
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Some(&lint_id) => self.set_level(lint_id, (level, CommandLine)),
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None => sess.err(format!("unknown {} flag: {}",
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level.as_str(), lint_name).as_slice()),
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}
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}
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}
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}
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/// Context for lint checking.
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pub struct Context<'a> {
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/// Type context we're checking in.
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pub tcx: &'a ty::ctxt,
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/// The store of registered lints.
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lints: LintStore,
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/// When recursing into an attributed node of the ast which modifies lint
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/// levels, this stack keeps track of the previous lint levels of whatever
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/// was modified.
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level_stack: Vec<(LintId, LevelSource)>,
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/// Level of lints for certain NodeIds, stored here because the body of
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/// the lint needs to run in trans.
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node_levels: RefCell<HashMap<(ast::NodeId, LintId), LevelSource>>,
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}
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/// Convenience macro for calling a `LintPass` method on every pass in the context.
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macro_rules! run_lints ( ($cx:expr, $f:ident, $($args:expr),*) => (
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for obj in $cx.lints.passes.iter() {
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obj.borrow_mut().$f($cx, $($args),*);
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}
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))
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/// Emit a lint as a warning or an error (or not at all)
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/// according to `level`.
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///
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/// This lives outside of `Context` so it can be used by checks
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/// in trans that run after the main lint pass is finished. Most
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/// lints elsewhere in the compiler should call
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/// `Session::add_lint()` instead.
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pub fn raw_emit_lint(sess: &Session, lint: &'static Lint,
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lvlsrc: LevelSource, span: Option<Span>, msg: &str) {
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let (mut level, source) = lvlsrc;
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if level == Allow { return }
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let mut note = None;
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let msg = match source {
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Default => {
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format!("{}, #[{}({})] on by default", msg,
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level.as_str(), lint.name)
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},
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CommandLine => {
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format!("{} [-{} {}]", msg,
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match level {
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Warn => 'W', Deny => 'D', Forbid => 'F',
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Allow => fail!()
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}, lint.name.replace("_", "-"))
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},
|
||||
Node(src) => {
|
||||
note = Some(src);
|
||||
msg.to_string()
|
||||
}
|
||||
};
|
||||
|
||||
// For purposes of printing, we can treat forbid as deny.
|
||||
if level == Forbid { level = Deny; }
|
||||
|
||||
match (level, span) {
|
||||
(Warn, Some(sp)) => sess.span_warn(sp, msg.as_slice()),
|
||||
(Warn, None) => sess.warn(msg.as_slice()),
|
||||
(Deny, Some(sp)) => sess.span_err(sp, msg.as_slice()),
|
||||
(Deny, None) => sess.err(msg.as_slice()),
|
||||
_ => sess.bug("impossible level in raw_emit_lint"),
|
||||
}
|
||||
|
||||
for span in note.move_iter() {
|
||||
sess.span_note(span, "lint level defined here");
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Context<'a> {
|
||||
fn new(tcx: &'a ty::ctxt) -> Context<'a> {
|
||||
// We want to own the lint store, so move it out of the session.
|
||||
let lint_store = mem::replace(&mut *tcx.sess.lint_store.borrow_mut(),
|
||||
LintStore::new());
|
||||
|
||||
Context {
|
||||
lints: lint_store,
|
||||
tcx: tcx,
|
||||
level_stack: vec!(),
|
||||
node_levels: RefCell::new(HashMap::new()),
|
||||
}
|
||||
}
|
||||
|
||||
/// Get the overall compiler `Session` object.
|
||||
pub fn sess(&'a self) -> &'a Session {
|
||||
&self.tcx.sess
|
||||
}
|
||||
|
||||
fn lookup_and_emit(&self, lint: &'static Lint, span: Option<Span>, msg: &str) {
|
||||
let (level, src) = match self.lints.levels.find(&LintId::of(lint)) {
|
||||
None => return,
|
||||
Some(&(Warn, src)) => {
|
||||
let lint_id = LintId::of(builtin::warnings);
|
||||
(self.lints.get_level_source(lint_id).val0(), src)
|
||||
}
|
||||
Some(&pair) => pair,
|
||||
};
|
||||
|
||||
raw_emit_lint(&self.tcx.sess, lint, (level, src), span, msg);
|
||||
}
|
||||
|
||||
/// Emit a lint at the appropriate level, with no associated span.
|
||||
pub fn lint(&self, lint: &'static Lint, msg: &str) {
|
||||
self.lookup_and_emit(lint, None, msg);
|
||||
}
|
||||
|
||||
/// Emit a lint at the appropriate level, for a particular span.
|
||||
pub fn span_lint(&self, lint: &'static Lint, span: Span, msg: &str) {
|
||||
self.lookup_and_emit(lint, Some(span), msg);
|
||||
}
|
||||
|
||||
/**
|
||||
* Merge the lints specified by any lint attributes into the
|
||||
* current lint context, call the provided function, then reset the
|
||||
* lints in effect to their previous state.
|
||||
*/
|
||||
fn with_lint_attrs(&mut self,
|
||||
attrs: &[ast::Attribute],
|
||||
f: |&mut Context|) {
|
||||
// Parse all of the lint attributes, and then add them all to the
|
||||
// current dictionary of lint information. Along the way, keep a history
|
||||
// of what we changed so we can roll everything back after invoking the
|
||||
// specified closure
|
||||
let lint_attrs = self.gather_lint_attrs(attrs);
|
||||
let mut pushed = 0u;
|
||||
for (lint_id, level, span) in lint_attrs.move_iter() {
|
||||
let now = self.lints.get_level_source(lint_id).val0();
|
||||
if now == Forbid && level != Forbid {
|
||||
let lint_name = lint_id.as_str();
|
||||
self.tcx.sess.span_err(span,
|
||||
format!("{}({}) overruled by outer forbid({})",
|
||||
level.as_str(), lint_name, lint_name).as_slice());
|
||||
} else if now != level {
|
||||
let src = self.lints.get_level_source(lint_id).val1();
|
||||
self.level_stack.push((lint_id, (now, src)));
|
||||
pushed += 1;
|
||||
self.lints.set_level(lint_id, (level, Node(span)));
|
||||
}
|
||||
}
|
||||
|
||||
run_lints!(self, enter_lint_attrs, attrs);
|
||||
f(self);
|
||||
run_lints!(self, exit_lint_attrs, attrs);
|
||||
|
||||
// rollback
|
||||
for _ in range(0, pushed) {
|
||||
let (lint, lvlsrc) = self.level_stack.pop().unwrap();
|
||||
self.lints.set_level(lint, lvlsrc);
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_ids(&self, f: |&mut ast_util::IdVisitor<Context>|) {
|
||||
let mut v = ast_util::IdVisitor {
|
||||
operation: self,
|
||||
pass_through_items: false,
|
||||
visited_outermost: false,
|
||||
};
|
||||
f(&mut v);
|
||||
}
|
||||
|
||||
fn gather_lint_attrs(&mut self, attrs: &[ast::Attribute]) -> Vec<(LintId, Level, Span)> {
|
||||
// Doing this as an iterator is messy due to multiple borrowing.
|
||||
// Allocating and copying these should be quick.
|
||||
let mut out = vec!();
|
||||
for attr in attrs.iter() {
|
||||
let level = match Level::from_str(attr.name().get()) {
|
||||
None => continue,
|
||||
Some(lvl) => lvl,
|
||||
};
|
||||
|
||||
attr::mark_used(attr);
|
||||
|
||||
let meta = attr.node.value;
|
||||
let metas = match meta.node {
|
||||
ast::MetaList(_, ref metas) => metas,
|
||||
_ => {
|
||||
self.tcx.sess.span_err(meta.span, "malformed lint attribute");
|
||||
continue;
|
||||
}
|
||||
};
|
||||
|
||||
for meta in metas.iter() {
|
||||
match meta.node {
|
||||
ast::MetaWord(ref lint_name) => {
|
||||
match self.lints.by_name.find_equiv(lint_name) {
|
||||
Some(lint_id) => out.push((*lint_id, level, meta.span)),
|
||||
|
||||
None => self.span_lint(builtin::unrecognized_lint,
|
||||
meta.span,
|
||||
format!("unknown `{}` attribute: `{}`",
|
||||
level.as_str(), lint_name).as_slice()),
|
||||
}
|
||||
}
|
||||
_ => self.tcx.sess.span_err(meta.span, "malformed lint attribute"),
|
||||
}
|
||||
}
|
||||
}
|
||||
out
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> AstConv for Context<'a>{
|
||||
fn tcx<'a>(&'a self) -> &'a ty::ctxt { self.tcx }
|
||||
|
||||
fn get_item_ty(&self, id: ast::DefId) -> ty::ty_param_bounds_and_ty {
|
||||
ty::lookup_item_type(self.tcx, id)
|
||||
}
|
||||
|
||||
fn get_trait_def(&self, id: ast::DefId) -> Rc<ty::TraitDef> {
|
||||
ty::lookup_trait_def(self.tcx, id)
|
||||
}
|
||||
|
||||
fn ty_infer(&self, _span: Span) -> ty::t {
|
||||
infer::new_infer_ctxt(self.tcx).next_ty_var()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Visitor<()> for Context<'a> {
|
||||
fn visit_item(&mut self, it: &ast::Item, _: ()) {
|
||||
self.with_lint_attrs(it.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_item, it);
|
||||
cx.visit_ids(|v| v.visit_item(it, ()));
|
||||
visit::walk_item(cx, it, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_foreign_item(&mut self, it: &ast::ForeignItem, _: ()) {
|
||||
self.with_lint_attrs(it.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_foreign_item, it);
|
||||
visit::walk_foreign_item(cx, it, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_view_item(&mut self, i: &ast::ViewItem, _: ()) {
|
||||
self.with_lint_attrs(i.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_view_item, i);
|
||||
cx.visit_ids(|v| v.visit_view_item(i, ()));
|
||||
visit::walk_view_item(cx, i, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_pat(&mut self, p: &ast::Pat, _: ()) {
|
||||
run_lints!(self, check_pat, p);
|
||||
visit::walk_pat(self, p, ());
|
||||
}
|
||||
|
||||
fn visit_expr(&mut self, e: &ast::Expr, _: ()) {
|
||||
run_lints!(self, check_expr, e);
|
||||
visit::walk_expr(self, e, ());
|
||||
}
|
||||
|
||||
fn visit_stmt(&mut self, s: &ast::Stmt, _: ()) {
|
||||
run_lints!(self, check_stmt, s);
|
||||
visit::walk_stmt(self, s, ());
|
||||
}
|
||||
|
||||
fn visit_fn(&mut self, fk: &FnKind, decl: &ast::FnDecl,
|
||||
body: &ast::Block, span: Span, id: ast::NodeId, _: ()) {
|
||||
match *fk {
|
||||
visit::FkMethod(_, _, m) => {
|
||||
self.with_lint_attrs(m.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_fn, fk, decl, body, span, id);
|
||||
cx.visit_ids(|v| {
|
||||
v.visit_fn(fk, decl, body, span, id, ());
|
||||
});
|
||||
visit::walk_fn(cx, fk, decl, body, span, ());
|
||||
})
|
||||
},
|
||||
_ => {
|
||||
run_lints!(self, check_fn, fk, decl, body, span, id);
|
||||
visit::walk_fn(self, fk, decl, body, span, ());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_ty_method(&mut self, t: &ast::TypeMethod, _: ()) {
|
||||
self.with_lint_attrs(t.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_ty_method, t);
|
||||
visit::walk_ty_method(cx, t, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_struct_def(&mut self,
|
||||
s: &ast::StructDef,
|
||||
ident: ast::Ident,
|
||||
g: &ast::Generics,
|
||||
id: ast::NodeId,
|
||||
_: ()) {
|
||||
run_lints!(self, check_struct_def, s, ident, g, id);
|
||||
visit::walk_struct_def(self, s, ());
|
||||
run_lints!(self, check_struct_def_post, s, ident, g, id);
|
||||
}
|
||||
|
||||
fn visit_struct_field(&mut self, s: &ast::StructField, _: ()) {
|
||||
self.with_lint_attrs(s.node.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_struct_field, s);
|
||||
visit::walk_struct_field(cx, s, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_variant(&mut self, v: &ast::Variant, g: &ast::Generics, _: ()) {
|
||||
self.with_lint_attrs(v.node.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_variant, v, g);
|
||||
visit::walk_variant(cx, v, g, ());
|
||||
})
|
||||
}
|
||||
|
||||
// FIXME(#10894) should continue recursing
|
||||
fn visit_ty(&mut self, t: &ast::Ty, _: ()) {
|
||||
run_lints!(self, check_ty, t);
|
||||
}
|
||||
|
||||
fn visit_ident(&mut self, sp: Span, id: ast::Ident, _: ()) {
|
||||
run_lints!(self, check_ident, sp, id);
|
||||
}
|
||||
|
||||
fn visit_mod(&mut self, m: &ast::Mod, s: Span, n: ast::NodeId, _: ()) {
|
||||
run_lints!(self, check_mod, m, s, n);
|
||||
visit::walk_mod(self, m, ());
|
||||
}
|
||||
|
||||
fn visit_local(&mut self, l: &ast::Local, _: ()) {
|
||||
run_lints!(self, check_local, l);
|
||||
visit::walk_local(self, l, ());
|
||||
}
|
||||
|
||||
fn visit_block(&mut self, b: &ast::Block, _: ()) {
|
||||
run_lints!(self, check_block, b);
|
||||
visit::walk_block(self, b, ());
|
||||
}
|
||||
|
||||
fn visit_arm(&mut self, a: &ast::Arm, _: ()) {
|
||||
run_lints!(self, check_arm, a);
|
||||
visit::walk_arm(self, a, ());
|
||||
}
|
||||
|
||||
fn visit_decl(&mut self, d: &ast::Decl, _: ()) {
|
||||
run_lints!(self, check_decl, d);
|
||||
visit::walk_decl(self, d, ());
|
||||
}
|
||||
|
||||
fn visit_expr_post(&mut self, e: &ast::Expr, _: ()) {
|
||||
run_lints!(self, check_expr_post, e);
|
||||
}
|
||||
|
||||
fn visit_generics(&mut self, g: &ast::Generics, _: ()) {
|
||||
run_lints!(self, check_generics, g);
|
||||
visit::walk_generics(self, g, ());
|
||||
}
|
||||
|
||||
fn visit_trait_method(&mut self, m: &ast::TraitMethod, _: ()) {
|
||||
run_lints!(self, check_trait_method, m);
|
||||
visit::walk_trait_method(self, m, ());
|
||||
}
|
||||
|
||||
fn visit_opt_lifetime_ref(&mut self, sp: Span, lt: &Option<ast::Lifetime>, _: ()) {
|
||||
run_lints!(self, check_opt_lifetime_ref, sp, lt);
|
||||
}
|
||||
|
||||
fn visit_lifetime_ref(&mut self, lt: &ast::Lifetime, _: ()) {
|
||||
run_lints!(self, check_lifetime_ref, lt);
|
||||
}
|
||||
|
||||
fn visit_lifetime_decl(&mut self, lt: &ast::Lifetime, _: ()) {
|
||||
run_lints!(self, check_lifetime_decl, lt);
|
||||
}
|
||||
|
||||
fn visit_explicit_self(&mut self, es: &ast::ExplicitSelf, _: ()) {
|
||||
run_lints!(self, check_explicit_self, es);
|
||||
visit::walk_explicit_self(self, es, ());
|
||||
}
|
||||
|
||||
fn visit_mac(&mut self, mac: &ast::Mac, _: ()) {
|
||||
run_lints!(self, check_mac, mac);
|
||||
visit::walk_mac(self, mac, ());
|
||||
}
|
||||
|
||||
fn visit_path(&mut self, p: &ast::Path, id: ast::NodeId, _: ()) {
|
||||
run_lints!(self, check_path, p, id);
|
||||
visit::walk_path(self, p, ());
|
||||
}
|
||||
|
||||
fn visit_attribute(&mut self, attr: &ast::Attribute, _: ()) {
|
||||
run_lints!(self, check_attribute, attr);
|
||||
}
|
||||
}
|
||||
|
||||
// Output any lints that were previously added to the session.
|
||||
impl<'a> IdVisitingOperation for Context<'a> {
|
||||
fn visit_id(&self, id: ast::NodeId) {
|
||||
match self.tcx.sess.lints.borrow_mut().pop(&id) {
|
||||
None => {}
|
||||
Some(lints) => {
|
||||
for (lint_id, span, msg) in lints.move_iter() {
|
||||
self.span_lint(lint_id.lint, span, msg.as_slice())
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// This lint pass is defined here because it touches parts of the `Context`
|
||||
// that we don't want to expose. It records the lint level at certain AST
|
||||
// nodes, so that the variant size difference check in trans can call
|
||||
// `raw_emit_lint`.
|
||||
|
||||
struct GatherNodeLevels;
|
||||
|
||||
impl LintPass for GatherNodeLevels {
|
||||
fn get_lints(&self) -> LintArray {
|
||||
lint_array!()
|
||||
}
|
||||
|
||||
fn check_item(&mut self, cx: &Context, it: &ast::Item) {
|
||||
match it.node {
|
||||
ast::ItemEnum(..) => {
|
||||
let lint_id = LintId::of(builtin::variant_size_difference);
|
||||
match cx.lints.get_level_source(lint_id) {
|
||||
lvlsrc @ (lvl, _) if lvl != Allow => {
|
||||
cx.node_levels.borrow_mut()
|
||||
.insert((it.id, lint_id), lvlsrc);
|
||||
},
|
||||
_ => { }
|
||||
}
|
||||
},
|
||||
_ => { }
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Perform lint checking on a crate.
|
||||
///
|
||||
/// Consumes the `lint_store` field of the `Session`.
|
||||
pub fn check_crate(tcx: &ty::ctxt,
|
||||
krate: &ast::Crate,
|
||||
exported_items: &ExportedItems) {
|
||||
let mut cx = Context::new(tcx);
|
||||
|
||||
// Visit the whole crate.
|
||||
cx.with_lint_attrs(krate.attrs.as_slice(), |cx| {
|
||||
cx.visit_id(ast::CRATE_NODE_ID);
|
||||
cx.visit_ids(|v| {
|
||||
v.visited_outermost = true;
|
||||
visit::walk_crate(v, krate, ());
|
||||
});
|
||||
|
||||
// since the root module isn't visited as an item (because it isn't an
|
||||
// item), warn for it here.
|
||||
run_lints!(cx, check_crate, exported_items, krate);
|
||||
|
||||
visit::walk_crate(cx, krate, ());
|
||||
});
|
||||
|
||||
// If we missed any lints added to the session, then there's a bug somewhere
|
||||
// in the iteration code.
|
||||
for (id, v) in tcx.sess.lints.borrow().iter() {
|
||||
for &(lint, span, ref msg) in v.iter() {
|
||||
tcx.sess.span_bug(span,
|
||||
format!("unprocessed lint {} at {}: {}",
|
||||
lint.as_str(), tcx.map.node_to_str(*id), *msg)
|
||||
.as_slice())
|
||||
}
|
||||
}
|
||||
|
||||
tcx.sess.abort_if_errors();
|
||||
*tcx.node_lint_levels.borrow_mut() = cx.node_levels.unwrap();
|
||||
}
|
|
@ -8,65 +8,55 @@
|
|||
// option. This file may not be copied, modified, or distributed
|
||||
// except according to those terms.
|
||||
|
||||
//! Lints, aka compiler warnings.
|
||||
//!
|
||||
//! A 'lint' check is a kind of miscellaneous constraint that a user _might_
|
||||
//! want to enforce, but might reasonably want to permit as well, on a
|
||||
//! module-by-module basis. They contrast with static constraints enforced by
|
||||
//! other phases of the compiler, which are generally required to hold in order
|
||||
//! to compile the program at all.
|
||||
//!
|
||||
//! The lint checking is all consolidated into one pass which runs just before
|
||||
//! translation to LLVM bytecode. Throughout compilation, lint warnings can be
|
||||
//! added via the `add_lint` method on the Session structure. This requires a
|
||||
//! span and an id of the node that the lint is being added to. The lint isn't
|
||||
//! actually emitted at that time because it is unknown what the actual lint
|
||||
//! level at that location is.
|
||||
//! Most lints can be written as `LintPass` instances. These run just before
|
||||
//! translation to LLVM bytecode. The `LintPass`es built into rustc are defined
|
||||
//! within `builtin.rs`, which has further comments on how to add such a lint.
|
||||
//!
|
||||
//! To actually emit lint warnings/errors, a separate pass is used just before
|
||||
//! translation. A context keeps track of the current state of all lint levels.
|
||||
//! Upon entering a node of the ast which can modify the lint settings, the
|
||||
//! previous lint state is pushed onto a stack and the ast is then recursed
|
||||
//! upon. As the ast is traversed, this keeps track of the current lint level
|
||||
//! for all lint attributes.
|
||||
//!
|
||||
//! Most of the lints built into `rustc` are structs implementing `LintPass`,
|
||||
//! and are defined within `builtin.rs`. To add a new lint you can define such
|
||||
//! a struct and add it to the `builtin_lints!` macro invocation in this file.
|
||||
//! `LintPass` itself is not a subtrait of `Default`, but the `builtin_lints!`
|
||||
//! macro requires `Default` (usually via `deriving`).
|
||||
//!
|
||||
//! Some lints are defined elsewhere in the compiler and work by calling
|
||||
//! `add_lint()` on the overall `Session` object.
|
||||
//!
|
||||
//! If you're adding lints to the `Context` infrastructure itself, defined in
|
||||
//! this file, use `span_lint` instead of `add_lint`.
|
||||
//! Some of rustc's lints are defined elsewhere in the compiler and work by
|
||||
//! calling `add_lint()` on the overall `Session` object. This works when
|
||||
//! it happens before the main lint pass, which emits the lints stored by
|
||||
//! `add_lint()`. To emit lints after the main lint pass (from trans, for
|
||||
//! example) requires more effort. See `emit_lint` and `GatherNodeLevels`
|
||||
//! in `context.rs`.
|
||||
|
||||
#![allow(non_camel_case_types)]
|
||||
#![macro_escape]
|
||||
|
||||
use middle::privacy::ExportedItems;
|
||||
use middle::ty;
|
||||
use middle::typeck::astconv::AstConv;
|
||||
use middle::typeck::infer;
|
||||
use driver::session::Session;
|
||||
use driver::early_error;
|
||||
|
||||
use std::collections::HashMap;
|
||||
use std::rc::Rc;
|
||||
use std::gc::Gc;
|
||||
use std::to_str::ToStr;
|
||||
use std::cell::RefCell;
|
||||
use std::default::Default;
|
||||
use std::hash::Hash;
|
||||
use std::tuple::Tuple2;
|
||||
use std::hash;
|
||||
use std::mem;
|
||||
use syntax::ast_util::IdVisitingOperation;
|
||||
use syntax::attr::AttrMetaMethods;
|
||||
use syntax::attr;
|
||||
use syntax::codemap::Span;
|
||||
use syntax::visit::{Visitor, FnKind};
|
||||
use syntax::{ast, ast_util, visit};
|
||||
use syntax::visit::FnKind;
|
||||
use syntax::ast;
|
||||
|
||||
pub use lint::context::{Context, LintStore, raw_emit_lint, check_crate};
|
||||
|
||||
/// Specification of a single lint.
|
||||
pub struct Lint {
|
||||
/// A string identifier for the lint.
|
||||
///
|
||||
/// Written with underscores, e.g. "unused_imports".
|
||||
/// This identifies the lint in attributes and in
|
||||
/// command-line arguments. On the command line,
|
||||
/// underscores become dashes.
|
||||
pub name: &'static str,
|
||||
|
||||
/// Default level for the lint.
|
||||
pub default_level: Level,
|
||||
|
||||
/// Description of the lint or the issue it detects.
|
||||
///
|
||||
/// e.g. "imports that are never used"
|
||||
pub desc: &'static str,
|
||||
}
|
||||
|
||||
/// Build a `Lint` initializer.
|
||||
#[macro_export]
|
||||
macro_rules! lint_initializer (
|
||||
($name:ident, $level:ident, $desc:expr) => (
|
||||
|
@ -78,6 +68,7 @@ macro_rules! lint_initializer (
|
|||
)
|
||||
)
|
||||
|
||||
/// Declare a static item of type `&'static Lint`.
|
||||
#[macro_export]
|
||||
macro_rules! declare_lint (
|
||||
// FIXME(#14660): deduplicate
|
||||
|
@ -91,6 +82,7 @@ macro_rules! declare_lint (
|
|||
);
|
||||
)
|
||||
|
||||
/// Declare a static `LintArray` and return it as an expression.
|
||||
#[macro_export]
|
||||
macro_rules! lint_array ( ($( $lint:expr ),*) => (
|
||||
{
|
||||
|
@ -99,29 +91,13 @@ macro_rules! lint_array ( ($( $lint:expr ),*) => (
|
|||
}
|
||||
))
|
||||
|
||||
pub mod builtin;
|
||||
|
||||
/// Specification of a single lint.
|
||||
pub struct Lint {
|
||||
/// An identifier for the lint, written with underscores,
|
||||
/// e.g. "unused_imports". This identifies the lint in
|
||||
/// attributes and in command-line arguments. On the
|
||||
/// command line, underscores become dashes.
|
||||
pub name: &'static str,
|
||||
|
||||
/// Default level for the lint.
|
||||
pub default_level: Level,
|
||||
|
||||
/// Description of the lint or the issue it detects,
|
||||
/// e.g. "imports that are never used"
|
||||
pub desc: &'static str,
|
||||
}
|
||||
|
||||
pub type LintArray = &'static [&'static Lint];
|
||||
|
||||
/// Trait for types providing lint checks. Each `check` method checks a single
|
||||
/// syntax node, and should not invoke methods recursively (unlike `Visitor`).
|
||||
/// By default they do nothing.
|
||||
/// Trait for types providing lint checks.
|
||||
///
|
||||
/// Each `check` method checks a single syntax node, and should not
|
||||
/// invoke methods recursively (unlike `Visitor`). By default they
|
||||
/// do nothing.
|
||||
//
|
||||
// FIXME: eliminate the duplication with `Visitor`. But this also
|
||||
// contains a few lint-specific methods with no equivalent in `Visitor`.
|
||||
|
@ -176,7 +152,8 @@ pub trait LintPass {
|
|||
fn exit_lint_attrs(&mut self, _: &Context, _: &[ast::Attribute]) { }
|
||||
}
|
||||
|
||||
type LintPassObject = Box<LintPass + 'static>;
|
||||
/// A lint pass boxed up as a trait object.
|
||||
pub type LintPassObject = Box<LintPass + 'static>;
|
||||
|
||||
/// Identifies a lint known to the compiler.
|
||||
#[deriving(Clone)]
|
||||
|
@ -193,7 +170,7 @@ impl PartialEq for LintId {
|
|||
|
||||
impl Eq for LintId { }
|
||||
|
||||
impl<S: hash::Writer> Hash<S> for LintId {
|
||||
impl<S: hash::Writer> hash::Hash<S> for LintId {
|
||||
fn hash(&self, state: &mut S) {
|
||||
let ptr = self.lint as *Lint;
|
||||
ptr.hash(state);
|
||||
|
@ -201,23 +178,27 @@ impl<S: hash::Writer> Hash<S> for LintId {
|
|||
}
|
||||
|
||||
impl LintId {
|
||||
/// Get the `LintId` for a `Lint`.
|
||||
pub fn of(lint: &'static Lint) -> LintId {
|
||||
LintId {
|
||||
lint: lint,
|
||||
}
|
||||
}
|
||||
|
||||
/// Get the name of the lint.
|
||||
pub fn as_str(&self) -> &'static str {
|
||||
self.lint.name
|
||||
}
|
||||
}
|
||||
|
||||
/// Setting for how to handle a lint.
|
||||
#[deriving(Clone, PartialEq, PartialOrd, Eq, Ord)]
|
||||
pub enum Level {
|
||||
Allow, Warn, Deny, Forbid
|
||||
}
|
||||
|
||||
impl Level {
|
||||
/// Convert a level to a lower-case string.
|
||||
pub fn as_str(self) -> &'static str {
|
||||
match self {
|
||||
Allow => "allow",
|
||||
|
@ -227,6 +208,7 @@ impl Level {
|
|||
}
|
||||
}
|
||||
|
||||
/// Convert a lower-case string to a level.
|
||||
pub fn from_str(x: &str) -> Option<Level> {
|
||||
match x {
|
||||
"allow" => Some(Allow),
|
||||
|
@ -238,534 +220,22 @@ impl Level {
|
|||
}
|
||||
}
|
||||
|
||||
// this is public for the lints that run in trans
|
||||
#[deriving(PartialEq)]
|
||||
/// How a lint level was set.
|
||||
#[deriving(Clone, PartialEq, Eq)]
|
||||
pub enum LintSource {
|
||||
Node(Span),
|
||||
/// Lint is at the default level as declared
|
||||
/// in rustc or a plugin.
|
||||
Default,
|
||||
CommandLine
|
||||
|
||||
/// Lint level was set by an attribute.
|
||||
Node(Span),
|
||||
|
||||
/// Lint level was set by a command-line flag.
|
||||
CommandLine,
|
||||
}
|
||||
|
||||
pub type LevelSource = (Level, LintSource);
|
||||
|
||||
/// Information about the registered lints.
|
||||
/// This is basically the subset of `Context` that we can
|
||||
/// build early in the compile pipeline.
|
||||
pub struct LintStore {
|
||||
/// Registered lints. The bool is true if the lint was
|
||||
/// added by a plugin.
|
||||
lints: Vec<(&'static Lint, bool)>,
|
||||
pub mod builtin;
|
||||
|
||||
/// Trait objects for each lint pass.
|
||||
passes: Vec<RefCell<LintPassObject>>,
|
||||
|
||||
/// Lints indexed by name.
|
||||
by_name: HashMap<&'static str, LintId>,
|
||||
|
||||
/// Current levels of each lint, and where they were set.
|
||||
levels: HashMap<LintId, LevelSource>,
|
||||
}
|
||||
|
||||
impl LintStore {
|
||||
fn get_level_source(&self, lint: LintId) -> LevelSource {
|
||||
match self.levels.find(&lint) {
|
||||
Some(&s) => s,
|
||||
None => (Allow, Default),
|
||||
}
|
||||
}
|
||||
|
||||
fn set_level(&mut self, lint: LintId, lvlsrc: LevelSource) {
|
||||
if lvlsrc.val0() == Allow {
|
||||
self.levels.remove(&lint);
|
||||
} else {
|
||||
self.levels.insert(lint, lvlsrc);
|
||||
}
|
||||
}
|
||||
|
||||
pub fn new() -> LintStore {
|
||||
LintStore {
|
||||
lints: vec!(),
|
||||
passes: vec!(),
|
||||
by_name: HashMap::new(),
|
||||
levels: HashMap::new(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get_lints<'t>(&'t self) -> &'t [(&'static Lint, bool)] {
|
||||
self.lints.as_slice()
|
||||
}
|
||||
|
||||
pub fn register_pass(&mut self, sess: Option<&Session>,
|
||||
from_plugin: bool, pass: LintPassObject) {
|
||||
for &lint in pass.get_lints().iter() {
|
||||
self.lints.push((lint, from_plugin));
|
||||
|
||||
let id = LintId::of(lint);
|
||||
if !self.by_name.insert(lint.name, id) {
|
||||
let msg = format!("duplicate specification of lint {}", lint.name);
|
||||
match (sess, from_plugin) {
|
||||
// We load builtin lints first, so a duplicate is a compiler bug.
|
||||
// Use early_error when handling -W help with no crate.
|
||||
(None, _) => early_error(msg.as_slice()),
|
||||
(Some(sess), false) => sess.bug(msg.as_slice()),
|
||||
|
||||
// A duplicate name from a plugin is a user error.
|
||||
(Some(sess), true) => sess.err(msg.as_slice()),
|
||||
}
|
||||
}
|
||||
|
||||
if lint.default_level != Allow {
|
||||
self.levels.insert(id, (lint.default_level, Default));
|
||||
}
|
||||
}
|
||||
self.passes.push(RefCell::new(pass));
|
||||
}
|
||||
|
||||
pub fn register_builtin(&mut self, sess: Option<&Session>) {
|
||||
macro_rules! add_builtin_lints ( ( $sess:ident, $($name:ident),*, ) => (
|
||||
{$(
|
||||
{
|
||||
let obj: builtin::$name = Default::default();
|
||||
self.register_pass($sess, false, box obj as LintPassObject);
|
||||
};
|
||||
)*}
|
||||
))
|
||||
|
||||
add_builtin_lints!(sess,
|
||||
WhileTrue, UnusedCasts, TypeLimits, CTypes, HeapMemory,
|
||||
RawPointerDeriving, UnusedAttribute, PathStatement,
|
||||
UnusedResult, DeprecatedOwnedVector, NonCamelCaseTypes,
|
||||
NonSnakeCaseFunctions, NonUppercaseStatics,
|
||||
NonUppercasePatternStatics, UppercaseVariables,
|
||||
UnnecessaryParens, UnusedUnsafe, UnsafeBlock, UnusedMut,
|
||||
UnnecessaryAllocation, MissingDoc, Stability,
|
||||
|
||||
GatherNodeLevels, HardwiredLints,
|
||||
)
|
||||
}
|
||||
|
||||
pub fn process_command_line(&mut self, sess: &Session) {
|
||||
for &(ref lint_name, level) in sess.opts.lint_opts.iter() {
|
||||
match self.by_name.find_equiv(&lint_name.as_slice()) {
|
||||
Some(&lint_id) => self.set_level(lint_id, (level, CommandLine)),
|
||||
None => sess.err(format!("unknown {} flag: {}",
|
||||
level.as_str(), lint_name).as_slice()),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Context for lint checking.
|
||||
pub struct Context<'a> {
|
||||
/// The store of registered lints.
|
||||
lints: LintStore,
|
||||
|
||||
/// Context we're checking in (used to access fields like sess).
|
||||
tcx: &'a ty::ctxt,
|
||||
|
||||
/// When recursing into an attributed node of the ast which modifies lint
|
||||
/// levels, this stack keeps track of the previous lint levels of whatever
|
||||
/// was modified.
|
||||
level_stack: Vec<(LintId, LevelSource)>,
|
||||
|
||||
/// Level of lints for certain NodeIds, stored here because the body of
|
||||
/// the lint needs to run in trans.
|
||||
node_levels: RefCell<HashMap<(ast::NodeId, LintId), LevelSource>>,
|
||||
}
|
||||
|
||||
/// Convenience macro for calling a `LintPass` method on every pass in the context.
|
||||
macro_rules! run_lints ( ($cx:expr, $f:ident, $($args:expr),*) => (
|
||||
for obj in $cx.lints.passes.iter() {
|
||||
obj.borrow_mut().$f($cx, $($args),*);
|
||||
}
|
||||
))
|
||||
|
||||
/// Emit a lint as a `span_warn` or `span_err` (or not at all)
|
||||
/// according to `level`. This lives outside of `Context` so
|
||||
/// it can be used by checks in trans that run after the main
|
||||
/// lint phase is finished.
|
||||
pub fn emit_lint(sess: &Session, lint: &'static Lint,
|
||||
lvlsrc: LevelSource, span: Span, msg: &str) {
|
||||
let (level, source) = lvlsrc;
|
||||
if level == Allow { return }
|
||||
|
||||
let mut note = None;
|
||||
let msg = match source {
|
||||
Default => {
|
||||
format!("{}, #[{}({})] on by default", msg,
|
||||
level_to_str(level), lint_str)
|
||||
},
|
||||
CommandLine => {
|
||||
format!("{} [-{} {}]", msg,
|
||||
match level {
|
||||
Warn => 'W', Deny => 'D', Forbid => 'F',
|
||||
Allow => fail!()
|
||||
}, lint.name.replace("_", "-"))
|
||||
},
|
||||
Node(src) => {
|
||||
note = Some(src);
|
||||
msg.to_string()
|
||||
}
|
||||
};
|
||||
|
||||
match level {
|
||||
Warn => { sess.span_warn(span, msg.as_slice()); }
|
||||
Deny | Forbid => { sess.span_err(span, msg.as_slice()); }
|
||||
Allow => fail!(),
|
||||
}
|
||||
|
||||
for span in note.move_iter() {
|
||||
sess.span_note(span, "lint level defined here");
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Context<'a> {
|
||||
pub fn span_lint(&self, lint: &'static Lint, span: Span, msg: &str) {
|
||||
let (level, src) = match self.lints.levels.find(&LintId::of(lint)) {
|
||||
None => return,
|
||||
Some(&(Warn, src))
|
||||
=> (self.lints.get_level_source(LintId::of(builtin::warnings)).val0(), src),
|
||||
Some(&pair) => pair,
|
||||
};
|
||||
|
||||
emit_lint(&self.tcx.sess, lint, (level, src), span, msg);
|
||||
}
|
||||
|
||||
/**
|
||||
* Merge the lints specified by any lint attributes into the
|
||||
* current lint context, call the provided function, then reset the
|
||||
* lints in effect to their previous state.
|
||||
*/
|
||||
fn with_lint_attrs(&mut self,
|
||||
attrs: &[ast::Attribute],
|
||||
f: |&mut Context|) {
|
||||
// Parse all of the lint attributes, and then add them all to the
|
||||
// current dictionary of lint information. Along the way, keep a history
|
||||
// of what we changed so we can roll everything back after invoking the
|
||||
// specified closure
|
||||
let lint_attrs = self.gather_lint_attrs(attrs);
|
||||
let mut pushed = 0u;
|
||||
for (lint_id, level, span) in lint_attrs.move_iter() {
|
||||
let now = self.lints.get_level_source(lint_id).val0();
|
||||
if now == Forbid && level != Forbid {
|
||||
let lint_name = lint_id.as_str();
|
||||
self.tcx.sess.span_err(span,
|
||||
format!("{}({}) overruled by outer forbid({})",
|
||||
level.as_str(), lint_name, lint_name).as_slice());
|
||||
} else if now != level {
|
||||
let src = self.lints.get_level_source(lint_id).val1();
|
||||
self.level_stack.push((lint_id, (now, src)));
|
||||
pushed += 1;
|
||||
self.lints.set_level(lint_id, (level, Node(span)));
|
||||
}
|
||||
}
|
||||
|
||||
run_lints!(self, enter_lint_attrs, attrs);
|
||||
f(self);
|
||||
run_lints!(self, exit_lint_attrs, attrs);
|
||||
|
||||
// rollback
|
||||
for _ in range(0, pushed) {
|
||||
let (lint, lvlsrc) = self.level_stack.pop().unwrap();
|
||||
self.lints.set_level(lint, lvlsrc);
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_ids(&self, f: |&mut ast_util::IdVisitor<Context>|) {
|
||||
let mut v = ast_util::IdVisitor {
|
||||
operation: self,
|
||||
pass_through_items: false,
|
||||
visited_outermost: false,
|
||||
};
|
||||
f(&mut v);
|
||||
}
|
||||
|
||||
fn insert_node_level(&self, id: ast::NodeId, lint: LintId, lvlsrc: LevelSource) {
|
||||
self.node_levels.borrow_mut().insert((id, lint), lvlsrc);
|
||||
}
|
||||
|
||||
fn gather_lint_attrs(&mut self, attrs: &[ast::Attribute]) -> Vec<(LintId, Level, Span)> {
|
||||
// Doing this as an iterator is messy due to multiple borrowing.
|
||||
// Allocating and copying these should be quick.
|
||||
let mut out = vec!();
|
||||
for attr in attrs.iter() {
|
||||
let level = match Level::from_str(attr.name().get()) {
|
||||
None => continue,
|
||||
Some(lvl) => lvl,
|
||||
};
|
||||
|
||||
attr::mark_used(attr);
|
||||
|
||||
let meta = attr.node.value;
|
||||
let metas = match meta.node {
|
||||
ast::MetaList(_, ref metas) => metas,
|
||||
_ => {
|
||||
self.tcx.sess.span_err(meta.span, "malformed lint attribute");
|
||||
continue;
|
||||
}
|
||||
};
|
||||
|
||||
for meta in metas.iter() {
|
||||
match meta.node {
|
||||
ast::MetaWord(ref lint_name) => {
|
||||
match self.lints.by_name.find_equiv(lint_name) {
|
||||
Some(lint_id) => out.push((*lint_id, level, meta.span)),
|
||||
|
||||
None => self.span_lint(builtin::unrecognized_lint,
|
||||
meta.span,
|
||||
format!("unknown `{}` attribute: `{}`",
|
||||
level.as_str(), lint_name).as_slice()),
|
||||
}
|
||||
}
|
||||
_ => self.tcx.sess.span_err(meta.span, "malformed lint attribute"),
|
||||
}
|
||||
}
|
||||
}
|
||||
out
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> AstConv for Context<'a>{
|
||||
fn tcx<'a>(&'a self) -> &'a ty::ctxt { self.tcx }
|
||||
|
||||
fn get_item_ty(&self, id: ast::DefId) -> ty::ty_param_bounds_and_ty {
|
||||
ty::lookup_item_type(self.tcx, id)
|
||||
}
|
||||
|
||||
fn get_trait_def(&self, id: ast::DefId) -> Rc<ty::TraitDef> {
|
||||
ty::lookup_trait_def(self.tcx, id)
|
||||
}
|
||||
|
||||
fn ty_infer(&self, _span: Span) -> ty::t {
|
||||
infer::new_infer_ctxt(self.tcx).next_ty_var()
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Visitor<()> for Context<'a> {
|
||||
fn visit_item(&mut self, it: &ast::Item, _: ()) {
|
||||
self.with_lint_attrs(it.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_item, it);
|
||||
cx.visit_ids(|v| v.visit_item(it, ()));
|
||||
visit::walk_item(cx, it, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_foreign_item(&mut self, it: &ast::ForeignItem, _: ()) {
|
||||
self.with_lint_attrs(it.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_foreign_item, it);
|
||||
visit::walk_foreign_item(cx, it, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_view_item(&mut self, i: &ast::ViewItem, _: ()) {
|
||||
self.with_lint_attrs(i.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_view_item, i);
|
||||
cx.visit_ids(|v| v.visit_view_item(i, ()));
|
||||
visit::walk_view_item(cx, i, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_pat(&mut self, p: &ast::Pat, _: ()) {
|
||||
run_lints!(self, check_pat, p);
|
||||
visit::walk_pat(self, p, ());
|
||||
}
|
||||
|
||||
fn visit_expr(&mut self, e: &ast::Expr, _: ()) {
|
||||
run_lints!(self, check_expr, e);
|
||||
visit::walk_expr(self, e, ());
|
||||
}
|
||||
|
||||
fn visit_stmt(&mut self, s: &ast::Stmt, _: ()) {
|
||||
run_lints!(self, check_stmt, s);
|
||||
visit::walk_stmt(self, s, ());
|
||||
}
|
||||
|
||||
fn visit_fn(&mut self, fk: &FnKind, decl: &ast::FnDecl,
|
||||
body: &ast::Block, span: Span, id: ast::NodeId, _: ()) {
|
||||
match *fk {
|
||||
visit::FkMethod(_, _, m) => {
|
||||
self.with_lint_attrs(m.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_fn, fk, decl, body, span, id);
|
||||
cx.visit_ids(|v| {
|
||||
v.visit_fn(fk, decl, body, span, id, ());
|
||||
});
|
||||
visit::walk_fn(cx, fk, decl, body, span, ());
|
||||
})
|
||||
},
|
||||
_ => {
|
||||
run_lints!(self, check_fn, fk, decl, body, span, id);
|
||||
visit::walk_fn(self, fk, decl, body, span, ());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_ty_method(&mut self, t: &ast::TypeMethod, _: ()) {
|
||||
self.with_lint_attrs(t.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_ty_method, t);
|
||||
visit::walk_ty_method(cx, t, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_struct_def(&mut self,
|
||||
s: &ast::StructDef,
|
||||
ident: ast::Ident,
|
||||
g: &ast::Generics,
|
||||
id: ast::NodeId,
|
||||
_: ()) {
|
||||
run_lints!(self, check_struct_def, s, ident, g, id);
|
||||
visit::walk_struct_def(self, s, ());
|
||||
run_lints!(self, check_struct_def_post, s, ident, g, id);
|
||||
}
|
||||
|
||||
fn visit_struct_field(&mut self, s: &ast::StructField, _: ()) {
|
||||
self.with_lint_attrs(s.node.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_struct_field, s);
|
||||
visit::walk_struct_field(cx, s, ());
|
||||
})
|
||||
}
|
||||
|
||||
fn visit_variant(&mut self, v: &ast::Variant, g: &ast::Generics, _: ()) {
|
||||
self.with_lint_attrs(v.node.attrs.as_slice(), |cx| {
|
||||
run_lints!(cx, check_variant, v, g);
|
||||
visit::walk_variant(cx, v, g, ());
|
||||
})
|
||||
}
|
||||
|
||||
// FIXME(#10894) should continue recursing
|
||||
fn visit_ty(&mut self, t: &ast::Ty, _: ()) {
|
||||
run_lints!(self, check_ty, t);
|
||||
}
|
||||
|
||||
fn visit_ident(&mut self, sp: Span, id: ast::Ident, _: ()) {
|
||||
run_lints!(self, check_ident, sp, id);
|
||||
}
|
||||
|
||||
fn visit_mod(&mut self, m: &ast::Mod, s: Span, n: ast::NodeId, _: ()) {
|
||||
run_lints!(self, check_mod, m, s, n);
|
||||
visit::walk_mod(self, m, ());
|
||||
}
|
||||
|
||||
fn visit_local(&mut self, l: &ast::Local, _: ()) {
|
||||
run_lints!(self, check_local, l);
|
||||
visit::walk_local(self, l, ());
|
||||
}
|
||||
|
||||
fn visit_block(&mut self, b: &ast::Block, _: ()) {
|
||||
run_lints!(self, check_block, b);
|
||||
visit::walk_block(self, b, ());
|
||||
}
|
||||
|
||||
fn visit_arm(&mut self, a: &ast::Arm, _: ()) {
|
||||
run_lints!(self, check_arm, a);
|
||||
visit::walk_arm(self, a, ());
|
||||
}
|
||||
|
||||
fn visit_decl(&mut self, d: &ast::Decl, _: ()) {
|
||||
run_lints!(self, check_decl, d);
|
||||
visit::walk_decl(self, d, ());
|
||||
}
|
||||
|
||||
fn visit_expr_post(&mut self, e: &ast::Expr, _: ()) {
|
||||
run_lints!(self, check_expr_post, e);
|
||||
}
|
||||
|
||||
fn visit_generics(&mut self, g: &ast::Generics, _: ()) {
|
||||
run_lints!(self, check_generics, g);
|
||||
visit::walk_generics(self, g, ());
|
||||
}
|
||||
|
||||
fn visit_trait_method(&mut self, m: &ast::TraitMethod, _: ()) {
|
||||
run_lints!(self, check_trait_method, m);
|
||||
visit::walk_trait_method(self, m, ());
|
||||
}
|
||||
|
||||
fn visit_opt_lifetime_ref(&mut self, sp: Span, lt: &Option<ast::Lifetime>, _: ()) {
|
||||
run_lints!(self, check_opt_lifetime_ref, sp, lt);
|
||||
}
|
||||
|
||||
fn visit_lifetime_ref(&mut self, lt: &ast::Lifetime, _: ()) {
|
||||
run_lints!(self, check_lifetime_ref, lt);
|
||||
}
|
||||
|
||||
fn visit_lifetime_decl(&mut self, lt: &ast::Lifetime, _: ()) {
|
||||
run_lints!(self, check_lifetime_decl, lt);
|
||||
}
|
||||
|
||||
fn visit_explicit_self(&mut self, es: &ast::ExplicitSelf, _: ()) {
|
||||
run_lints!(self, check_explicit_self, es);
|
||||
visit::walk_explicit_self(self, es, ());
|
||||
}
|
||||
|
||||
fn visit_mac(&mut self, mac: &ast::Mac, _: ()) {
|
||||
run_lints!(self, check_mac, mac);
|
||||
visit::walk_mac(self, mac, ());
|
||||
}
|
||||
|
||||
fn visit_path(&mut self, p: &ast::Path, id: ast::NodeId, _: ()) {
|
||||
run_lints!(self, check_path, p, id);
|
||||
visit::walk_path(self, p, ());
|
||||
}
|
||||
|
||||
fn visit_attribute(&mut self, attr: &ast::Attribute, _: ()) {
|
||||
run_lints!(self, check_attribute, attr);
|
||||
}
|
||||
}
|
||||
|
||||
// Output any lints that were previously added to the session.
|
||||
impl<'a> IdVisitingOperation for Context<'a> {
|
||||
fn visit_id(&self, id: ast::NodeId) {
|
||||
match self.tcx.sess.lints.borrow_mut().pop(&id) {
|
||||
None => {}
|
||||
Some(lints) => {
|
||||
for (lint_id, span, msg) in lints.move_iter() {
|
||||
self.span_lint(lint_id.lint, span, msg.as_slice())
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn check_crate(tcx: &ty::ctxt,
|
||||
exported_items: &ExportedItems,
|
||||
krate: &ast::Crate) {
|
||||
|
||||
// We want to own the lint store, so move it out of the session.
|
||||
let lint_store = mem::replace(&mut *tcx.sess.lint_store.borrow_mut(),
|
||||
LintStore::new());
|
||||
|
||||
let mut cx = Context {
|
||||
lints: lint_store,
|
||||
tcx: tcx,
|
||||
level_stack: Vec::new(),
|
||||
node_levels: RefCell::new(HashMap::new()),
|
||||
};
|
||||
|
||||
// Visit the whole crate.
|
||||
cx.with_lint_attrs(krate.attrs.as_slice(), |cx| {
|
||||
cx.visit_id(ast::CRATE_NODE_ID);
|
||||
cx.visit_ids(|v| {
|
||||
v.visited_outermost = true;
|
||||
visit::walk_crate(v, krate, ());
|
||||
});
|
||||
|
||||
// since the root module isn't visited as an item (because it isn't an
|
||||
// item), warn for it here.
|
||||
run_lints!(cx, check_crate, exported_items, krate);
|
||||
|
||||
visit::walk_crate(cx, krate, ());
|
||||
});
|
||||
|
||||
// If we missed any lints added to the session, then there's a bug somewhere
|
||||
// in the iteration code.
|
||||
for (id, v) in tcx.sess.lints.borrow().iter() {
|
||||
for &(lint, span, ref msg) in v.iter() {
|
||||
tcx.sess.span_bug(span,
|
||||
format!("unprocessed lint {} at {}: {}",
|
||||
lint.as_str(), tcx.map.node_to_str(*id), *msg)
|
||||
.as_slice())
|
||||
}
|
||||
}
|
||||
|
||||
tcx.sess.abort_if_errors();
|
||||
*tcx.node_lint_levels.borrow_mut() = cx.node_levels.unwrap();
|
||||
}
|
||||
mod context;
|
||||
|
|
|
@ -1553,50 +1553,51 @@ fn enum_variant_size_lint(ccx: &CrateContext, enum_def: &ast::EnumDef, sp: Span,
|
|||
let mut sizes = Vec::new(); // does no allocation if no pushes, thankfully
|
||||
|
||||
let levels = ccx.tcx.node_lint_levels.borrow();
|
||||
match levels.find(&(id, lint::LintId::of(lint::builtin::variant_size_difference))) {
|
||||
None | Some(&(lint::Allow, _)) => (),
|
||||
Some(&lvlsrc) => {
|
||||
let avar = adt::represent_type(ccx, ty::node_id_to_type(ccx.tcx(), id));
|
||||
match *avar {
|
||||
adt::General(_, ref variants) => {
|
||||
for var in variants.iter() {
|
||||
let mut size = 0;
|
||||
for field in var.fields.iter().skip(1) {
|
||||
// skip the discriminant
|
||||
size += llsize_of_real(ccx, sizing_type_of(ccx, *field));
|
||||
}
|
||||
sizes.push(size);
|
||||
}
|
||||
},
|
||||
_ => { /* its size is either constant or unimportant */ }
|
||||
let lint_id = lint::LintId::of(lint::builtin::variant_size_difference);
|
||||
let lvlsrc = match levels.find(&(id, lint_id)) {
|
||||
None | Some(&(lint::Allow, _)) => return,
|
||||
Some(&lvlsrc) => lvlsrc,
|
||||
};
|
||||
|
||||
let avar = adt::represent_type(ccx, ty::node_id_to_type(ccx.tcx(), id));
|
||||
match *avar {
|
||||
adt::General(_, ref variants) => {
|
||||
for var in variants.iter() {
|
||||
let mut size = 0;
|
||||
for field in var.fields.iter().skip(1) {
|
||||
// skip the discriminant
|
||||
size += llsize_of_real(ccx, sizing_type_of(ccx, *field));
|
||||
}
|
||||
sizes.push(size);
|
||||
}
|
||||
},
|
||||
_ => { /* its size is either constant or unimportant */ }
|
||||
}
|
||||
|
||||
let (largest, slargest, largest_index) = sizes.iter().enumerate().fold((0, 0, 0),
|
||||
|(l, s, li), (idx, &size)|
|
||||
if size > l {
|
||||
(size, l, idx)
|
||||
} else if size > s {
|
||||
(l, size, li)
|
||||
} else {
|
||||
(l, s, li)
|
||||
}
|
||||
);
|
||||
|
||||
// we only warn if the largest variant is at least thrice as large as
|
||||
// the second-largest.
|
||||
if largest > slargest * 3 && slargest > 0 {
|
||||
// Use lint::emit_lint rather than sess.add_lint because the lint-printing
|
||||
// pass for the latter already ran.
|
||||
lint::emit_lint(&ccx.tcx().sess, lint::builtin::variant_size_difference,
|
||||
lvlsrc, sp,
|
||||
format!("enum variant is more than three times larger \
|
||||
({} bytes) than the next largest (ignoring padding)",
|
||||
largest).as_slice());
|
||||
|
||||
ccx.sess().span_note(enum_def.variants.get(largest_index).span,
|
||||
"this variant is the largest");
|
||||
let (largest, slargest, largest_index) = sizes.iter().enumerate().fold((0, 0, 0),
|
||||
|(l, s, li), (idx, &size)|
|
||||
if size > l {
|
||||
(size, l, idx)
|
||||
} else if size > s {
|
||||
(l, size, li)
|
||||
} else {
|
||||
(l, s, li)
|
||||
}
|
||||
}
|
||||
);
|
||||
|
||||
// we only warn if the largest variant is at least thrice as large as
|
||||
// the second-largest.
|
||||
if largest > slargest * 3 && slargest > 0 {
|
||||
// Use lint::raw_emit_lint rather than sess.add_lint because the lint-printing
|
||||
// pass for the latter already ran.
|
||||
lint::raw_emit_lint(&ccx.tcx().sess, lint::builtin::variant_size_difference,
|
||||
lvlsrc, Some(sp),
|
||||
format!("enum variant is more than three times larger \
|
||||
({} bytes) than the next largest (ignoring padding)",
|
||||
largest).as_slice());
|
||||
|
||||
ccx.sess().span_note(enum_def.variants.get(largest_index).span,
|
||||
"this variant is the largest");
|
||||
}
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue