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https://github.com/rust-lang/rust-clippy
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Merge pull request #2067 from jugglerchris/no_effect_with_drop
Fix #2061 (don't suggest removing types which implement Drop)
This commit is contained in:
Oliver Schneider
GitHub
commit
45e5f28bb9
4 changed files with 200 additions and 133 deletions
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@ -1,7 +1,7 @@
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use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
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use rustc::hir::def::Def;
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use rustc::hir::{BiAnd, BiOr, BlockCheckMode, Expr, Expr_, Stmt, StmtSemi, UnsafeSource};
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use utils::{in_macro, snippet_opt, span_lint, span_lint_and_sugg};
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use utils::{in_macro, snippet_opt, span_lint, span_lint_and_sugg, has_drop};
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use std::ops::Deref;
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/// **What it does:** Checks for statements which have no effect.
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@ -45,7 +45,8 @@ fn has_no_effect(cx: &LateContext, expr: &Expr) -> bool {
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return false;
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}
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match expr.node {
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Expr_::ExprLit(..) | Expr_::ExprClosure(.., _) | Expr_::ExprPath(..) => true,
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Expr_::ExprLit(..) | Expr_::ExprClosure(.., _) => true,
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Expr_::ExprPath(..) => !has_drop(cx, expr),
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Expr_::ExprIndex(ref a, ref b) | Expr_::ExprBinary(_, ref a, ref b) => {
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has_no_effect(cx, a) && has_no_effect(cx, b)
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},
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@ -59,7 +60,7 @@ fn has_no_effect(cx: &LateContext, expr: &Expr) -> bool {
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Expr_::ExprAddrOf(_, ref inner) |
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Expr_::ExprBox(ref inner) => has_no_effect(cx, inner),
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Expr_::ExprStruct(_, ref fields, ref base) => {
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fields.iter().all(|field| has_no_effect(cx, &field.expr)) && match *base {
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!has_drop(cx, expr) && fields.iter().all(|field| has_no_effect(cx, &field.expr)) && match *base {
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Some(ref base) => has_no_effect(cx, base),
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None => true,
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}
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@ -68,7 +69,7 @@ fn has_no_effect(cx: &LateContext, expr: &Expr) -> bool {
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let def = cx.tables.qpath_def(qpath, callee.hir_id);
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match def {
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Def::Struct(..) | Def::Variant(..) | Def::StructCtor(..) | Def::VariantCtor(..) => {
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args.iter().all(|arg| has_no_effect(cx, arg))
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!has_drop(cx, expr) && args.iter().all(|arg| has_no_effect(cx, arg))
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},
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_ => false,
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}
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@ -145,18 +146,23 @@ fn reduce_expression<'a>(cx: &LateContext, expr: &'a Expr) -> Option<Vec<&'a Exp
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Expr_::ExprTupField(ref inner, _) |
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Expr_::ExprAddrOf(_, ref inner) |
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Expr_::ExprBox(ref inner) => reduce_expression(cx, inner).or_else(|| Some(vec![inner])),
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Expr_::ExprStruct(_, ref fields, ref base) => Some(
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fields
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.iter()
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.map(|f| &f.expr)
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.chain(base)
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.map(Deref::deref)
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.collect(),
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),
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Expr_::ExprStruct(_, ref fields, ref base) => {
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if has_drop(cx, expr) {
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None
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} else {
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Some(
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fields
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.iter()
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.map(|f| &f.expr)
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.chain(base)
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.map(Deref::deref)
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.collect())
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}
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},
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Expr_::ExprCall(ref callee, ref args) => if let Expr_::ExprPath(ref qpath) = callee.node {
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let def = cx.tables.qpath_def(qpath, callee.hir_id);
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match def {
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Def::Struct(..) | Def::Variant(..) | Def::StructCtor(..) | Def::VariantCtor(..) => {
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Def::Struct(..) | Def::Variant(..) | Def::StructCtor(..) | Def::VariantCtor(..) if !has_drop(cx, expr) => {
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Some(args.iter().collect())
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},
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_ => None,
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@ -358,6 +358,15 @@ pub fn implements_trait<'a, 'tcx>(
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})
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}
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/// Check whether this type implements Drop.
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pub fn has_drop(cx: &LateContext, expr: &Expr) -> bool {
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let struct_ty = cx.tables.expr_ty(expr);
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match struct_ty.ty_adt_def() {
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Some(def) => def.has_dtor(cx.tcx),
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_ => false,
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}
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}
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/// Resolve the definition of a node from its `HirId`.
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pub fn resolve_node(cx: &LateContext, qpath: &QPath, id: HirId) -> def::Def {
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cx.tables.qpath_def(qpath, id)
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@ -16,7 +16,30 @@ enum Enum {
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Tuple(i32),
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Struct { field: i32 },
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}
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struct DropUnit;
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impl Drop for DropUnit {
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fn drop(&mut self) {}
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}
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struct DropStruct {
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field: i32
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}
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impl Drop for DropStruct {
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fn drop(&mut self) {}
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}
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struct DropTuple(i32);
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impl Drop for DropTuple {
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fn drop(&mut self) {}
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}
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enum DropEnum {
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Tuple(i32),
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Struct { field: i32 },
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}
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impl Drop for DropEnum {
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fn drop(&mut self) {}
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}
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struct FooString {
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s: String,
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}
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union Union {
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a: u8,
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b: f64,
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@ -24,6 +47,7 @@ union Union {
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fn get_number() -> i32 { 0 }
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fn get_struct() -> Struct { Struct { field: 0 } }
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fn get_drop_struct() -> DropStruct { DropStruct { field: 0 } }
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unsafe fn unsafe_fn() -> i32 { 0 }
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@ -57,10 +81,17 @@ fn main() {
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[42; 55][13];
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let mut x = 0;
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|| x += 5;
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let s: String = "foo".into();
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FooString { s: s };
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// Do not warn
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get_number();
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unsafe { unsafe_fn() };
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DropUnit;
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DropStruct { field: 0 };
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DropTuple(0);
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DropEnum::Tuple(0);
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DropEnum::Struct { field: 0 };
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Tuple(get_number());
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Struct { field: get_number() };
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@ -81,4 +112,13 @@ fn main() {
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[get_number(); 55];
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[42; 55][get_number() as usize];
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{get_number()};
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FooString { s: String::from("blah"), };
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// Do not warn
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DropTuple(get_number());
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DropStruct { field: get_number() };
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DropStruct { field: get_number() };
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DropStruct { ..get_drop_struct() };
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DropEnum::Tuple(get_number());
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DropEnum::Struct { field: get_number() };
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}
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@ -1,268 +1,280 @@
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error: statement with no effect
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--> $DIR/no_effect.rs:34:5
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--> $DIR/no_effect.rs:58:5
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34 | 0;
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58 | 0;
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| ^^
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= note: `-D no-effect` implied by `-D warnings`
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error: statement with no effect
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--> $DIR/no_effect.rs:35:5
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--> $DIR/no_effect.rs:59:5
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35 | s2;
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59 | s2;
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| ^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:36:5
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--> $DIR/no_effect.rs:60:5
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36 | Unit;
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60 | Unit;
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| ^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:37:5
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--> $DIR/no_effect.rs:61:5
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37 | Tuple(0);
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61 | Tuple(0);
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| ^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:38:5
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--> $DIR/no_effect.rs:62:5
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38 | Struct { field: 0 };
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62 | Struct { field: 0 };
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| ^^^^^^^^^^^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:39:5
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--> $DIR/no_effect.rs:63:5
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39 | Struct { ..s };
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63 | Struct { ..s };
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| ^^^^^^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:40:5
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--> $DIR/no_effect.rs:64:5
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40 | Union { a: 0 };
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64 | Union { a: 0 };
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| ^^^^^^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:41:5
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--> $DIR/no_effect.rs:65:5
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41 | Enum::Tuple(0);
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65 | Enum::Tuple(0);
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| ^^^^^^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:42:5
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--> $DIR/no_effect.rs:66:5
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42 | Enum::Struct { field: 0 };
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66 | Enum::Struct { field: 0 };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:43:5
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--> $DIR/no_effect.rs:67:5
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43 | 5 + 6;
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67 | 5 + 6;
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| ^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:44:5
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--> $DIR/no_effect.rs:68:5
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44 | *&42;
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68 | *&42;
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| ^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:45:5
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--> $DIR/no_effect.rs:69:5
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45 | &6;
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69 | &6;
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| ^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:46:5
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--> $DIR/no_effect.rs:70:5
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|
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46 | (5, 6, 7);
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70 | (5, 6, 7);
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| ^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:47:5
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--> $DIR/no_effect.rs:71:5
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|
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47 | box 42;
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71 | box 42;
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| ^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:48:5
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--> $DIR/no_effect.rs:72:5
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|
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48 | ..;
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72 | ..;
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| ^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:49:5
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--> $DIR/no_effect.rs:73:5
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|
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49 | 5..;
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73 | 5..;
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| ^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:50:5
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--> $DIR/no_effect.rs:74:5
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|
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50 | ..5;
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74 | ..5;
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| ^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:51:5
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--> $DIR/no_effect.rs:75:5
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|
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51 | 5..6;
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75 | 5..6;
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| ^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:52:5
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--> $DIR/no_effect.rs:76:5
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|
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52 | 5..=6;
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76 | 5..=6;
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| ^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:53:5
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--> $DIR/no_effect.rs:77:5
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|
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53 | [42, 55];
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77 | [42, 55];
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| ^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:54:5
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--> $DIR/no_effect.rs:78:5
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|
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54 | [42, 55][1];
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78 | [42, 55][1];
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| ^^^^^^^^^^^^
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error: statement with no effect
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--> $DIR/no_effect.rs:55:5
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--> $DIR/no_effect.rs:79:5
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|
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55 | (42, 55).1;
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79 | (42, 55).1;
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| ^^^^^^^^^^^
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|
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error: statement with no effect
|
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--> $DIR/no_effect.rs:56:5
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--> $DIR/no_effect.rs:80:5
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|
|
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56 | [42; 55];
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80 | [42; 55];
|
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| ^^^^^^^^^
|
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|
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error: statement with no effect
|
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--> $DIR/no_effect.rs:57:5
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--> $DIR/no_effect.rs:81:5
|
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|
|
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57 | [42; 55][13];
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81 | [42; 55][13];
|
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| ^^^^^^^^^^^^^
|
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|
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error: statement with no effect
|
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--> $DIR/no_effect.rs:59:5
|
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--> $DIR/no_effect.rs:83:5
|
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|
|
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59 | || x += 5;
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83 | || x += 5;
|
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| ^^^^^^^^^^
|
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|
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error: statement can be reduced
|
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--> $DIR/no_effect.rs:65:5
|
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error: statement with no effect
|
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--> $DIR/no_effect.rs:85:5
|
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|
|
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65 | Tuple(get_number());
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85 | FooString { s: s };
|
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| ^^^^^^^^^^^^^^^^^^^
|
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|
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error: statement can be reduced
|
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--> $DIR/no_effect.rs:96:5
|
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|
|
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96 | Tuple(get_number());
|
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| ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
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|
|
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= note: `-D unnecessary-operation` implied by `-D warnings`
|
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|
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error: statement can be reduced
|
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--> $DIR/no_effect.rs:66:5
|
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--> $DIR/no_effect.rs:97:5
|
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|
|
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66 | Struct { field: get_number() };
|
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97 | Struct { field: get_number() };
|
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
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|
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error: statement can be reduced
|
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--> $DIR/no_effect.rs:67:5
|
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--> $DIR/no_effect.rs:98:5
|
||||
|
|
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67 | Struct { ..get_struct() };
|
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98 | Struct { ..get_struct() };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_struct();`
|
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|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:68:5
|
||||
--> $DIR/no_effect.rs:99:5
|
||||
|
|
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68 | Enum::Tuple(get_number());
|
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99 | Enum::Tuple(get_number());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
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error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:69:5
|
||||
|
|
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69 | Enum::Struct { field: get_number() };
|
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:100:5
|
||||
|
|
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100 | Enum::Struct { field: get_number() };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:70:5
|
||||
|
|
||||
70 | 5 + get_number();
|
||||
| ^^^^^^^^^^^^^^^^^ help: replace it with: `5;get_number();`
|
||||
--> $DIR/no_effect.rs:101:5
|
||||
|
|
||||
101 | 5 + get_number();
|
||||
| ^^^^^^^^^^^^^^^^^ help: replace it with: `5;get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:71:5
|
||||
|
|
||||
71 | *&get_number();
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:102:5
|
||||
|
|
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102 | *&get_number();
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
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|
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error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:72:5
|
||||
|
|
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72 | &get_number();
|
||||
| ^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
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--> $DIR/no_effect.rs:103:5
|
||||
|
|
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103 | &get_number();
|
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| ^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
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|
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error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:73:5
|
||||
|
|
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73 | (5, 6, get_number());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `5;6;get_number();`
|
||||
--> $DIR/no_effect.rs:104:5
|
||||
|
|
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104 | (5, 6, get_number());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `5;6;get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:74:5
|
||||
|
|
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74 | box get_number();
|
||||
| ^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:105:5
|
||||
|
|
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105 | box get_number();
|
||||
| ^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:75:5
|
||||
|
|
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75 | get_number()..;
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:106:5
|
||||
|
|
||||
106 | get_number()..;
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:76:5
|
||||
|
|
||||
76 | ..get_number();
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:107:5
|
||||
|
|
||||
107 | ..get_number();
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:77:5
|
||||
|
|
||||
77 | 5..get_number();
|
||||
| ^^^^^^^^^^^^^^^^ help: replace it with: `5;get_number();`
|
||||
--> $DIR/no_effect.rs:108:5
|
||||
|
|
||||
108 | 5..get_number();
|
||||
| ^^^^^^^^^^^^^^^^ help: replace it with: `5;get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:78:5
|
||||
|
|
||||
78 | [42, get_number()];
|
||||
| ^^^^^^^^^^^^^^^^^^^ help: replace it with: `42;get_number();`
|
||||
--> $DIR/no_effect.rs:109:5
|
||||
|
|
||||
109 | [42, get_number()];
|
||||
| ^^^^^^^^^^^^^^^^^^^ help: replace it with: `42;get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:79:5
|
||||
|
|
||||
79 | [42, 55][get_number() as usize];
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `[42, 55];get_number() as usize;`
|
||||
--> $DIR/no_effect.rs:110:5
|
||||
|
|
||||
110 | [42, 55][get_number() as usize];
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `[42, 55];get_number() as usize;`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:80:5
|
||||
|
|
||||
80 | (42, get_number()).1;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `42;get_number();`
|
||||
--> $DIR/no_effect.rs:111:5
|
||||
|
|
||||
111 | (42, get_number()).1;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `42;get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:81:5
|
||||
|
|
||||
81 | [get_number(); 55];
|
||||
| ^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:112:5
|
||||
|
|
||||
112 | [get_number(); 55];
|
||||
| ^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:82:5
|
||||
|
|
||||
82 | [42; 55][get_number() as usize];
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `[42; 55];get_number() as usize;`
|
||||
--> $DIR/no_effect.rs:113:5
|
||||
|
|
||||
113 | [42; 55][get_number() as usize];
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `[42; 55];get_number() as usize;`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:83:5
|
||||
|
|
||||
83 | {get_number()};
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
--> $DIR/no_effect.rs:114:5
|
||||
|
|
||||
114 | {get_number()};
|
||||
| ^^^^^^^^^^^^^^^ help: replace it with: `get_number();`
|
||||
|
||||
error: statement can be reduced
|
||||
--> $DIR/no_effect.rs:115:5
|
||||
|
|
||||
115 | FooString { s: String::from("blah"), };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `String::from("blah");`
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue