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https://github.com/rust-lang/rust-clippy
synced 2024-12-30 06:53:27 +00:00
d647696c1f
So, some context for this, well, more a story. I'm not used to scripting, I've never really scripted anything, even if it's a valuable skill. I just never really needed it. Now, `@flip1995` correctly suggested using a script for this in `rust-clippy#7813`...
And I decided to write a script using nushell because why not? This was a mistake... I spend way more time on this than I would like to admit. It has definitely been more than 4 hours. It shouldn't take that long, but me being new to scripting and nushell just wasn't a good mixture... Anyway, here is the script that creates another script which adds the versions. Fun...
Just execute this on the `gh-pages` branch and the resulting `replacer.sh` in `clippy_lints` and it should all work.
```nu
mv v0.0.212 rust-1.00.0;
mv beta rust-1.57.0;
mv master rust-1.58.0;
let paths = (open ./rust-1.58.0/lints.json | select id id_span | flatten | select id path);
let versions = (
ls | where name =~ "rust-" | select name | format {name}/lints.json |
each { open $it | select id | insert version $it | str substring "5,11" version} |
group-by id | rotate counter-clockwise id version |
update version {get version | first 1} | flatten | select id version);
$paths | each { |row|
let version = ($versions | where id == ($row.id) | format {version})
let idu = ($row.id | str upcase)
$"sed -i '0,/($idu),/{s/pub ($idu),/#[clippy::version = "($version)"]\n pub ($idu),/}' ($row.path)"
} | str collect ";" | str find-replace --all '1.00.0' 'pre 1.29.0' | save "replacer.sh";
```
And this still has some problems, but at this point I just want to be done -.-
86 lines
2.9 KiB
Rust
86 lines
2.9 KiB
Rust
use clippy_utils::diagnostics::span_lint_and_then;
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use if_chain::if_chain;
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use rustc_errors::Applicability;
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use rustc_hir::{Item, ItemKind};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_middle::mir::interpret::ConstValue;
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use rustc_middle::ty::layout::LayoutOf;
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use rustc_middle::ty::{self, ConstKind};
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use rustc_session::{declare_tool_lint, impl_lint_pass};
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use rustc_span::{BytePos, Pos, Span};
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use rustc_typeck::hir_ty_to_ty;
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declare_clippy_lint! {
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/// ### What it does
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/// Checks for large `const` arrays that should
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/// be defined as `static` instead.
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///
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/// ### Why is this bad?
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/// Performance: const variables are inlined upon use.
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/// Static items result in only one instance and has a fixed location in memory.
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///
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/// ### Example
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/// ```rust,ignore
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/// // Bad
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/// pub const a = [0u32; 1_000_000];
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///
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/// // Good
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/// pub static a = [0u32; 1_000_000];
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/// ```
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#[clippy::version = "1.44.0"]
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pub LARGE_CONST_ARRAYS,
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perf,
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"large non-scalar const array may cause performance overhead"
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}
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pub struct LargeConstArrays {
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maximum_allowed_size: u64,
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}
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impl LargeConstArrays {
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#[must_use]
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pub fn new(maximum_allowed_size: u64) -> Self {
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Self { maximum_allowed_size }
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}
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}
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impl_lint_pass!(LargeConstArrays => [LARGE_CONST_ARRAYS]);
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impl<'tcx> LateLintPass<'tcx> for LargeConstArrays {
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fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
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if_chain! {
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if !item.span.from_expansion();
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if let ItemKind::Const(hir_ty, _) = &item.kind;
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let ty = hir_ty_to_ty(cx.tcx, hir_ty);
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if let ty::Array(element_type, cst) = ty.kind();
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if let ConstKind::Value(ConstValue::Scalar(element_count)) = cst.val;
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if let Ok(element_count) = element_count.to_machine_usize(&cx.tcx);
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if let Ok(element_size) = cx.layout_of(element_type).map(|l| l.size.bytes());
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if self.maximum_allowed_size < element_count * element_size;
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then {
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let hi_pos = item.ident.span.lo() - BytePos::from_usize(1);
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let sugg_span = Span::new(
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hi_pos - BytePos::from_usize("const".len()),
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hi_pos,
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item.span.ctxt(),
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item.span.parent(),
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);
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span_lint_and_then(
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cx,
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LARGE_CONST_ARRAYS,
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item.span,
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"large array defined as const",
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|diag| {
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diag.span_suggestion(
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sugg_span,
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"make this a static item",
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"static".to_string(),
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Applicability::MachineApplicable,
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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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