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use clippy_utils::get_attr;
use rustc_hir as hir;
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_session::{declare_lint_pass, declare_tool_lint};
declare_clippy_lint! {
/// ### What it does
/// It formats the attached node with `{:#?}` and writes the result to the
/// standard output. This is intended for debugging.
///
/// ### Examples
/// ```rs
/// #[clippy::dump]
/// use std::mem;
///
/// #[clippy::dump]
/// fn foo(input: u32) -> u64 {
/// input as u64
/// }
/// ```
pub DUMP_HIR,
internal_warn,
"helper to dump info about code"
}
declare_lint_pass!(DumpHir => [DUMP_HIR]);
impl<'tcx> LateLintPass<'tcx> for DumpHir {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
if has_attr(cx, item.hir_id()) {
println!("{item:#?}");
}
}
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
if has_attr(cx, expr.hir_id) {
println!("{expr:#?}");
}
}
fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx hir::Stmt<'_>) {
match stmt.kind {
hir::StmtKind::Expr(e) | hir::StmtKind::Semi(e) if has_attr(cx, e.hir_id) => return,
_ => {},
}
if has_attr(cx, stmt.hir_id) {
println!("{stmt:#?}");
}
}
}
fn has_attr(cx: &LateContext<'_>, hir_id: hir::HirId) -> bool {
let attrs = cx.tcx.hir().attrs(hir_id);
get_attr(cx.sess(), attrs, "dump").count() > 0
}
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