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Don't walk the hir unnecessarily let the visitor do it
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@DevinR528
DevinR528 committed Jun 8, 2021
1 parent e57441a commit 237aef4
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Showing 3 changed files with 55 additions and 187 deletions.
223 changes: 45 additions & 178 deletions clippy_lints/src/disallowed_type.rs
View file
Original file line number Diff line number Diff line change
@@ -1,17 +1,13 @@
use clippy_utils::diagnostics::span_lint;

use rustc_data_structures::fx::FxHashSet;
use rustc_hir::{
def::Res, FnRetTy, GenericArg, GenericArgs, GenericBound, GenericParamKind, Item, ItemKind, Path, PolyTraitRef, Ty,
TyKind, TypeBindingKind, UseKind,
};
use rustc_hir::{def::Res, Item, ItemKind, PolyTraitRef, TraitBoundModifier, Ty, TyKind, UseKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty;
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::Symbol;
use rustc_span::{Span, Symbol};

declare_clippy_lint! {
/// **What it does:** Denies the configured types in clippy.toml
/// **What it does:** Denies the configured types in clippy.toml.
///
/// **Why is this bad?** Some types are undesirable in certain contexts.
///
Expand All @@ -24,8 +20,16 @@ declare_clippy_lint! {
/// `disallowed-methods = ["alloc::collections::btree::map::BTreeMap"]` and not
/// `disallowed-methods = ["std::collections::BTreeMap"]` as you might expect.
///
/// N.B. There is no way to ban primitive types.
///
/// **Example:**
///
/// An example clippy.toml configuration:
/// ```toml
/// # clippy.toml
/// disallowed-methods = ["alloc::collections::btree::map::BTreeMap"]
/// ```
///
/// ```rust,ignore
/// use std::collections::BTreeMap;
/// // or its use
Expand Down Expand Up @@ -58,198 +62,61 @@ impl DisallowedType {

impl_lint_pass!(DisallowedType => [DISALLOWED_TYPE]);

impl LateLintPass<'_> for DisallowedType {
fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
impl<'tcx> LateLintPass<'tcx> for DisallowedType {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
if_chain! {
if let ItemKind::Use(path, UseKind::Single) = &item.kind;
if let Res::Def(_, id) = path.res;
let use_path = cx.get_def_path(id);
if let Some(name) = self.disallowed.iter().find(|path| **path == use_path);
then {
let name = name.iter()
.map(|s| s.to_ident_string())
.collect::<Vec<_>>()
.join("::");
span_lint(
cx,
DISALLOWED_TYPE,
item.span,
&format!("`{}` is not allowed according to config", name),
);
emit(cx, name, item.span,);
}
}
}

fn check_ty(&mut self, cx: &LateContext<'_>, ty: &Ty<'_>) {
walk_to_path(cx, ty, &self.disallowed);
}
}

fn walk_to_path(cx: &LateContext<'_>, ty: &Ty<'_>, disallowed: &FxHashSet<Vec<Symbol>>) {
match &ty.kind {
TyKind::Slice(t) => walk_to_path(cx, t, disallowed),
TyKind::Array(t, c) => {
walk_to_path(cx, t, disallowed);
// TODO: a bit hacky
walk_to_path(
cx,
&Ty {
hir_id: ty.hir_id,
kind: TyKind::Typeof(*c),
span: ty.span,
},
disallowed,
);
},
TyKind::Ptr(mutable) | TyKind::Rptr(_, mutable) => walk_to_path(cx, mutable.ty, disallowed),
TyKind::BareFn(barefn) => {
for input in barefn.decl.inputs {
walk_to_path(cx, input, disallowed);
}
if let FnRetTy::Return(t) = barefn.decl.output {
walk_to_path(cx, t, disallowed);
}
},
TyKind::Tup(tup) => {
for t in *tup {
walk_to_path(cx, t, disallowed);
}
},
TyKind::Path(path) => {
if_chain! {
if let Some(did) = cx.qpath_res(path, ty.hir_id).opt_def_id();
let use_path = cx.get_def_path(did);
if let Some(name) = disallowed.iter().find(|path| **path == use_path);
then {
let name = name.iter()
.map(|s| s.to_ident_string())
.collect::<Vec<_>>()
.join("::");
span_lint(
cx,
DISALLOWED_TYPE,
path.span(),
&format!("`{}` is not allowed according to config", name),
);
}
}
},
TyKind::OpaqueDef(_, gen) => {
for arg in *gen {
if let GenericArg::Type(t) = arg {
walk_to_path(cx, t, disallowed);
}
}
},
TyKind::TraitObject(polyref, _, _) => walk_trait_obj(cx, &polyref.iter().collect::<Vec<_>>(), disallowed),
TyKind::Typeof(anonconst) => {
if_chain! {
if let Some(tyck) = cx.maybe_typeck_results();
if let Some(var_ty) = tyck.node_type_opt(anonconst.hir_id);
if let ty::Adt(ty::AdtDef { did, .. }, _) = var_ty.kind();
let use_path = cx.get_def_path(*did);
if let Some(name) = disallowed.iter().find(|path| **path == use_path);
then {
let name = name.iter()
.map(|s| s.to_ident_string())
.collect::<Vec<_>>()
.join("::");
span_lint(
cx,
DISALLOWED_TYPE,
ty.span,
&format!("`{}` is not allowed according to config", name),
);
}
fn check_ty(&mut self, cx: &LateContext<'tcx>, ty: &'tcx Ty<'tcx>) {
if_chain! {
if let TyKind::Path(path) = &ty.kind;
if let Some(did) = cx.qpath_res(path, ty.hir_id).opt_def_id();
let use_path = cx.get_def_path(did);
if let Some(name) = self.disallowed.iter().find(|path| **path == use_path);
then {
emit(cx, name, path.span());
}
},
TyKind::Infer | TyKind::Never | TyKind::Err => {},
}
}

fn walk_path_segments(cx: &LateContext<'_>, path: &Path<'_>, disallowed: &FxHashSet<Vec<Symbol>>) {
for arg in path.segments.iter().filter_map(|s| s.args) {
walk_gen_args(cx, arg, disallowed);
}
}
}

fn walk_trait_obj(cx: &LateContext<'_>, poly: &[&PolyTraitRef<'_>], disallowed: &FxHashSet<Vec<Symbol>>) {
for poly in poly {
fn check_poly_trait_ref(&mut self, cx: &LateContext<'tcx>, poly: &'tcx PolyTraitRef<'tcx>, _: TraitBoundModifier) {
if_chain! {
if let Res::Def(_, did) = poly.trait_ref.path.res;
let use_path = cx.get_def_path(did);
if let Some(name) = disallowed.iter().find(|path| **path == use_path);
if let Some(name) = self.disallowed.iter().find(|path| **path == use_path);
then {
let name = name.iter()
.map(|s| s.to_ident_string())
.collect::<Vec<_>>()
.join("::");
span_lint(
cx,
DISALLOWED_TYPE,
poly.trait_ref.path.span,
&format!("`{}` is not allowed according to config", name),
);
}
}
walk_path_segments(cx, poly.trait_ref.path, disallowed);

for param in poly.bound_generic_params {
walk_gen_bounds(cx, param.bounds, disallowed);
match param.kind {
GenericParamKind::Type { default: Some(ty), .. } => walk_to_path(cx, ty, disallowed),
GenericParamKind::Const {
ty,
default: Some(anon),
} => {
walk_to_path(cx, ty, disallowed);
walk_to_path(
cx,
&Ty {
hir_id: ty.hir_id,
kind: TyKind::Typeof(anon),
span: ty.span,
},
disallowed,
);
},
_ => {},
emit(cx, name, poly.trait_ref.path.span);
}
}
}
}

fn walk_gen_args(cx: &LateContext<'_>, gen_args: &GenericArgs<'_>, disallowed: &FxHashSet<Vec<Symbol>>) {
for arg in gen_args.args {
match arg {
GenericArg::Type(t) => walk_to_path(cx, t, disallowed),
GenericArg::Const(c) => walk_to_path(
cx,
&Ty {
hir_id: c.value.hir_id,
kind: TyKind::Typeof(c.value),
span: c.span,
},
disallowed,
),
GenericArg::Lifetime(_) => {},
}
}
for bind in gen_args.bindings {
match bind.kind {
TypeBindingKind::Equality { ty } => walk_to_path(cx, ty, disallowed),
TypeBindingKind::Constraint { bounds } => walk_gen_bounds(cx, bounds, disallowed),
}
walk_gen_args(cx, bind.gen_args, disallowed);
}
// TODO: if non primitive const generics are a thing
// fn check_generic_arg(&mut self, cx: &LateContext<'tcx>, arg: &'tcx GenericArg<'tcx>) {
// match arg {
// GenericArg::Const(c) => {},
// }
// }
// fn check_generic_param(&mut self, cx: &LateContext<'tcx>, param: &'tcx GenericParam<'tcx>) {
// match param.kind {
// GenericParamKind::Const { .. } => {},
// }
// }
}

fn walk_gen_bounds(cx: &LateContext<'_>, bounds: &[GenericBound<'_>], disallowed: &FxHashSet<Vec<Symbol>>) {
for b in bounds {
match b {
GenericBound::Trait(poly, _) => walk_trait_obj(cx, &[poly], disallowed),
GenericBound::LangItemTrait(_, _, _, gen) => walk_gen_args(cx, gen, disallowed),
GenericBound::Outlives(_) => {},
}
}
fn emit(cx: &LateContext<'_>, name: &[Symbol], span: Span) {
let name = name.iter().map(|s| s.to_ident_string()).collect::<Vec<_>>().join("::");
span_lint(
cx,
DISALLOWED_TYPE,
span,
&format!("`{}` is not allowed according to config", name),
);
}
3 changes: 2 additions & 1 deletion tests/ui-toml/toml_disallowed_type/conf_disallowed_type.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,14 +21,15 @@ fn trait_obj(_: &dyn std::io::Read) {
todo!()
}

static BAD: foo::atomic::AtomicPtr<()> = foo::atomic::AtomicPtr::new(std::ptr::null_mut());

#[allow(clippy::diverging_sub_expression)]
fn main() {
let _: std::collections::HashMap<(), ()> = std::collections::HashMap::new();
let _ = Sneaky::now();
let _ = foo::atomic::AtomicU32::new(0);
static FOO: std::sync::atomic::AtomicU32 = foo::atomic::AtomicU32::new(1);
let _: std::collections::BTreeMap<(), syn::TypePath> = Default::default();
// diverging_sub_expression ?
let _ = syn::Ident::new("", todo!());
let _ = HashMap;
}
16 changes: 8 additions & 8 deletions tests/ui-toml/toml_disallowed_type/conf_disallowed_type.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -37,49 +37,49 @@ LL | fn trait_obj(_: &dyn std::io::Read) {
| ^^^^^^^^^^^^^

error: `std::collections::hash::map::HashMap` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:26:48
--> $DIR/conf_disallowed_type.rs:28:48
|
LL | let _: std::collections::HashMap<(), ()> = std::collections::HashMap::new();
| ^^^^^^^^^^^^^^^^^^^^^^^^^

error: `std::collections::hash::map::HashMap` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:26:12
--> $DIR/conf_disallowed_type.rs:28:12
|
LL | let _: std::collections::HashMap<(), ()> = std::collections::HashMap::new();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: `std::time::Instant` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:27:13
--> $DIR/conf_disallowed_type.rs:29:13
|
LL | let _ = Sneaky::now();
| ^^^^^^

error: `core::sync::atomic::AtomicU32` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:28:13
--> $DIR/conf_disallowed_type.rs:30:13
|
LL | let _ = foo::atomic::AtomicU32::new(0);
| ^^^^^^^^^^^^^^^^^^^^^^

error: `core::sync::atomic::AtomicU32` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:29:17
--> $DIR/conf_disallowed_type.rs:31:17
|
LL | static FOO: std::sync::atomic::AtomicU32 = foo::atomic::AtomicU32::new(1);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: `core::sync::atomic::AtomicU32` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:29:48
--> $DIR/conf_disallowed_type.rs:31:48
|
LL | static FOO: std::sync::atomic::AtomicU32 = foo::atomic::AtomicU32::new(1);
| ^^^^^^^^^^^^^^^^^^^^^^

error: `syn::ty::TypePath` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:30:43
--> $DIR/conf_disallowed_type.rs:32:43
|
LL | let _: std::collections::BTreeMap<(), syn::TypePath> = Default::default();
| ^^^^^^^^^^^^^

error: `proc_macro2::Ident` is not allowed according to config
--> $DIR/conf_disallowed_type.rs:32:13
--> $DIR/conf_disallowed_type.rs:33:13
|
LL | let _ = syn::Ident::new("", todo!());
| ^^^^^^^^^^
Expand Down

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