Move ty::print methods to Drop-based scope guards

compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs

@@ -779,29 +779,35 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         assert_inhabited | assert_zero_valid | assert_uninit_valid, <T> () {
             let layout = fx.layout_of(T);
             if layout.abi.is_uninhabited() {
-                with_no_trimmed_paths(|| crate::base::codegen_panic(
-                    fx,
-                    &format!("attempted to instantiate uninhabited type `{}`", T),
-                    span,
-                ));
+                with_no_trimmed_paths!({
+                    crate::base::codegen_panic(
+                        fx,
+                        &format!("attempted to instantiate uninhabited type `{}`", T),
+                        span,
+                    )
+                });
                 return;
             }
 
             if intrinsic == sym::assert_zero_valid && !layout.might_permit_raw_init(fx, /*zero:*/ true) {
-                with_no_trimmed_paths(|| crate::base::codegen_panic(
-                    fx,
-                    &format!("attempted to zero-initialize type `{}`, which is invalid", T),
-                    span,
-                ));
+                with_no_trimmed_paths!({
+                    crate::base::codegen_panic(
+                        fx,
+                        &format!("attempted to zero-initialize type `{}`, which is invalid", T),
+                        span,
+                    );
+                });
                 return;
             }
 
             if intrinsic == sym::assert_uninit_valid && !layout.might_permit_raw_init(fx, /*zero:*/ false) {
-                with_no_trimmed_paths(|| crate::base::codegen_panic(
-                    fx,
-                    &format!("attempted to leave type `{}` uninitialized, which is invalid", T),
-                    span,
-                ));
+                with_no_trimmed_paths!({
+                    crate::base::codegen_panic(
+                        fx,
+                        &format!("attempted to leave type `{}` uninitialized, which is invalid", T),
+                        span,
+                    )
+                });
                 return;
             }
         };

compiler/rustc_codegen_gcc/src/type_of.rs

@@ -52,7 +52,7 @@ pub fn uncached_gcc_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, layout: TyAndLa
         ty::Adt(..) | ty::Closure(..) | ty::Foreign(..) | ty::Generator(..) | ty::Str
             if !cx.sess().fewer_names() =>
         {
-            let mut name = with_no_trimmed_paths(|| layout.ty.to_string());
+            let mut name = with_no_trimmed_paths!(layout.ty.to_string());
             if let (&ty::Adt(def, _), &Variants::Single { index }) =
                 (layout.ty.kind(), &layout.variants)
             {

compiler/rustc_codegen_llvm/src/type_of.rs

@@ -43,8 +43,7 @@ fn uncached_llvm_type<'a, 'tcx>(
         // in problematically distinct types due to HRTB and subtyping (see #47638).
         // ty::Dynamic(..) |
         ty::Adt(..) | ty::Closure(..) | ty::Foreign(..) | ty::Generator(..) | ty::Str => {
-            let mut name =
-                with_no_visible_paths(|| with_no_trimmed_paths(|| layout.ty.to_string()));
+            let mut name = with_no_visible_paths!(with_no_trimmed_paths!(layout.ty.to_string()));
             if let (&ty::Adt(def, _), &Variants::Single { index }) =
                 (layout.ty.kind(), &layout.variants)
             {

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -535,8 +535,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 UninitValid => !layout.might_permit_raw_init(bx, /*zero:*/ false),
             };
             if do_panic {
-                let msg_str = with_no_visible_paths(|| {
-                    with_no_trimmed_paths(|| {
+                let msg_str = with_no_visible_paths!({
+                    with_no_trimmed_paths!({
                         if layout.abi.is_uninhabited() {
                             // Use this error even for the other intrinsics as it is more precise.
                             format!("attempted to instantiate uninhabited type `{}`", ty)

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -53,7 +53,7 @@ fn eval_body_using_ecx<'mir, 'tcx>(
 
     trace!(
         "eval_body_using_ecx: pushing stack frame for global: {}{}",
-        with_no_trimmed_paths(|| ty::tls::with(|tcx| tcx.def_path_str(cid.instance.def_id()))),
+        with_no_trimmed_paths!(ty::tls::with(|tcx| tcx.def_path_str(cid.instance.def_id()))),
         cid.promoted.map_or_else(String::new, |p| format!("::promoted[{:?}]", p))
     );
 
@@ -274,7 +274,7 @@ pub fn eval_to_allocation_raw_provider<'tcx>(
         // The next two lines concatenated contain some discussion:
         // https://rust-lang.zulipchat.com/#narrow/stream/146212-t-compiler.2Fconst-eval/
         // subject/anon_const_instance_printing/near/135980032
-        let instance = with_no_trimmed_paths(|| key.value.instance.to_string());
+        let instance = with_no_trimmed_paths!(key.value.instance.to_string());
         trace!("const eval: {:?} ({})", key, instance);
     }
 
@@ -317,7 +317,7 @@ pub fn eval_to_allocation_raw_provider<'tcx>(
                     // the expression, leading to the const eval error.
                     let instance = &key.value.instance;
                     if !instance.substs.is_empty() {
-                        let instance = with_no_trimmed_paths(|| instance.to_string());
+                        let instance = with_no_trimmed_paths!(instance.to_string());
                         let msg = format!("evaluation of `{}` failed", instance);
                         Cow::from(msg)
                     } else {

compiler/rustc_const_eval/src/interpret/validity.rs

@@ -33,7 +33,7 @@ macro_rules! throw_validation_failure {
             msg.push_str(", but expected ");
             write!(&mut msg, $($expected_fmt),+).unwrap();
         )?
-        let path = rustc_middle::ty::print::with_no_trimmed_paths(|| {
+        let path = rustc_middle::ty::print::with_no_trimmed_paths!({
             let where_ = &$where;
             if !where_.is_empty() {
                 let mut path = String::new();

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -108,9 +108,10 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                         .as_ref()
                         .and_then(|node| node.generics())
                     {
-                        let constraint = with_no_trimmed_paths(|| {
-                            format!("~const {}", trait_ref.print_only_trait_path())
-                        });
+                        let constraint = with_no_trimmed_paths!(format!(
+                            "~const {}",
+                            trait_ref.print_only_trait_path()
+                        ));
                         suggest_constraining_type_param(
                             tcx,
                             generics,

compiler/rustc_lint/src/builtin.rs

@@ -2634,7 +2634,7 @@ impl<'tcx> LateLintPass<'tcx> for InvalidValue {
             // We are extremely conservative with what we warn about.
             let conjured_ty = cx.typeck_results().expr_ty(expr);
             if let Some((msg, span)) =
-                with_no_trimmed_paths(|| ty_find_init_error(cx.tcx, conjured_ty, init))
+                with_no_trimmed_paths!(ty_find_init_error(cx.tcx, conjured_ty, init))
             {
                 cx.struct_span_lint(INVALID_VALUE, expr.span, |lint| {
                     let mut err = lint.build(&format!(

compiler/rustc_lint/src/context.rs

@@ -994,7 +994,7 @@ impl<'tcx> LateContext<'tcx> {
                 }
 
                 // This shouldn't ever be needed, but just in case:
-                with_no_trimmed_paths(|| {
+                with_no_trimmed_paths!({
                     Ok(vec![match trait_ref {
                         Some(trait_ref) => Symbol::intern(&format!("{:?}", trait_ref)),
                         None => Symbol::intern(&format!("<{}>", self_ty)),
@@ -1013,15 +1013,15 @@ impl<'tcx> LateContext<'tcx> {
 
                 // This shouldn't ever be needed, but just in case:
                 path.push(match trait_ref {
-                    Some(trait_ref) => with_no_trimmed_paths(|| {
-                        Symbol::intern(&format!(
+                    Some(trait_ref) => {
+                        with_no_trimmed_paths!(Symbol::intern(&format!(
                             "<impl {} for {}>",
                             trait_ref.print_only_trait_path(),
                             self_ty
-                        ))
-                    }),
+                        )))
+                    }
                     None => {
-                        with_no_trimmed_paths(|| Symbol::intern(&format!("<impl {}>", self_ty)))
+                        with_no_trimmed_paths!(Symbol::intern(&format!("<impl {}>", self_ty)))
                     }
                 });
 

compiler/rustc_macros/src/query.rs

@@ -434,7 +434,9 @@ fn add_query_description_impl(
         #[allow(unused_variables)]
         fn describe(tcx: QueryCtxt<$tcx>, key: Self::Key) -> String {
             let (#tcx, #key) = (*tcx, key);
-            ::rustc_middle::ty::print::with_no_trimmed_paths(|| format!(#desc).into())
+            ::rustc_middle::ty::print::with_no_trimmed_paths!(
+                format!(#desc)
+            )
         }
     };
 

compiler/rustc_middle/src/lib.rs

@@ -55,6 +55,7 @@
 #![feature(try_reserve_kind)]
 #![feature(nonzero_ops)]
 #![feature(unwrap_infallible)]
+#![feature(decl_macro)]
 #![recursion_limit = "512"]
 #![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
 

compiler/rustc_middle/src/middle/stability.rs

@@ -367,7 +367,7 @@ impl<'tcx> TyCtxt<'tcx> {
                     let is_in_effect = deprecation_in_effect(depr_attr);
                     let lint = deprecation_lint(is_in_effect);
                     if self.lint_level_at_node(lint, id).0 != Level::Allow {
-                        let def_path = &with_no_trimmed_paths(|| self.def_path_str(def_id));
+                        let def_path = with_no_trimmed_paths!(self.def_path_str(def_id));
                         let def_kind = self.def_kind(def_id).descr(def_id);
 
                         late_report_deprecation(
@@ -377,7 +377,7 @@ impl<'tcx> TyCtxt<'tcx> {
                                 depr_attr.since,
                                 depr_attr.note,
                                 def_kind,
-                                def_path,
+                                &def_path,
                             ),
                             depr_attr.suggestion,
                             lint,

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -147,7 +147,7 @@ pub struct GlobalId<'tcx> {
 
 impl<'tcx> GlobalId<'tcx> {
     pub fn display(self, tcx: TyCtxt<'tcx>) -> String {
-        let instance_name = with_no_trimmed_paths(|| tcx.def_path_str(self.instance.def.def_id()));
+        let instance_name = with_no_trimmed_paths!(tcx.def_path_str(self.instance.def.def_id()));
         if let Some(promoted) = self.promoted {
             format!("{}::{:?}", instance_name, promoted)
         } else {

compiler/rustc_middle/src/mir/pretty.rs

@@ -94,10 +94,8 @@ pub fn dump_enabled<'tcx>(tcx: TyCtxt<'tcx>, pass_name: &str, def_id: DefId) ->
         None => return false,
         Some(ref filters) => filters,
     };
-    let node_path = ty::print::with_forced_impl_filename_line(|| {
-        // see notes on #41697 below
-        tcx.def_path_str(def_id)
-    });
+    // see notes on #41697 below
+    let node_path = ty::print::with_forced_impl_filename_line!(tcx.def_path_str(def_id));
     filters.split('|').any(|or_filter| {
         or_filter.split('&').all(|and_filter| {
             let and_filter_trimmed = and_filter.trim();
@@ -125,10 +123,9 @@ fn dump_matched_mir_node<'tcx, F>(
     let _: io::Result<()> = try {
         let mut file =
             create_dump_file(tcx, "mir", pass_num, pass_name, disambiguator, body.source)?;
-        let def_path = ty::print::with_forced_impl_filename_line(|| {
-            // see notes on #41697 above
-            tcx.def_path_str(body.source.def_id())
-        });
+        // see notes on #41697 above
+        let def_path =
+            ty::print::with_forced_impl_filename_line!(tcx.def_path_str(body.source.def_id()));
         write!(file, "// MIR for `{}", def_path)?;
         match body.source.promoted {
             None => write!(file, "`")?,
@@ -959,10 +956,10 @@ fn write_mir_sig(tcx: TyCtxt<'_>, body: &Body<'_>, w: &mut dyn Write) -> io::Res
         _ => bug!("Unexpected def kind {:?}", kind),
     }
 
-    ty::print::with_forced_impl_filename_line(|| {
+    ty::print::with_forced_impl_filename_line! {
         // see notes on #41697 elsewhere
-        write!(w, "{}", tcx.def_path_str(def_id))
-    })?;
+        write!(w, "{}", tcx.def_path_str(def_id))?
+    }
 
     if body.source.promoted.is_none() && is_function {
         write!(w, "(")?;

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -63,66 +63,59 @@ thread_local! {
     static NO_VISIBLE_PATH: Cell<bool> = const { Cell::new(false) };
 }
 
-/// Avoids running any queries during any prints that occur
-/// during the closure. This may alter the appearance of some
-/// types (e.g. forcing verbose printing for opaque types).
-/// This method is used during some queries (e.g. `explicit_item_bounds`
-/// for opaque types), to ensure that any debug printing that
-/// occurs during the query computation does not end up recursively
-/// calling the same query.
-pub fn with_no_queries<F: FnOnce() -> R, R>(f: F) -> R {
-    NO_QUERIES.with(|no_queries| {
-        let old = no_queries.replace(true);
-        let result = f();
-        no_queries.set(old);
-        result
-    })
-}
-
-/// Force us to name impls with just the filename/line number. We
-/// normally try to use types. But at some points, notably while printing
-/// cycle errors, this can result in extra or suboptimal error output,
-/// so this variable disables that check.
-pub fn with_forced_impl_filename_line<F: FnOnce() -> R, R>(f: F) -> R {
-    FORCE_IMPL_FILENAME_LINE.with(|force| {
-        let old = force.replace(true);
-        let result = f();
-        force.set(old);
-        result
-    })
-}
+macro_rules! define_helper {
+    ($($(#[$a:meta])* fn $name:ident($helper:ident, $tl:ident);)+) => {
+        $(
+            #[must_use]
+            pub struct $helper(bool);
+
+            impl $helper {
+                pub fn new() -> $helper {
+                    $helper($tl.with(|c| c.replace(true)))
+                }
+            }
 
-/// Adds the `crate::` prefix to paths where appropriate.
-pub fn with_crate_prefix<F: FnOnce() -> R, R>(f: F) -> R {
-    SHOULD_PREFIX_WITH_CRATE.with(|flag| {
-        let old = flag.replace(true);
-        let result = f();
-        flag.set(old);
-        result
-    })
-}
+            $(#[$a])*
+            pub macro $name($e:expr) {
+                {
+                    let _guard = $helper::new();
+                    $e
+                }
+            }
 
-/// Prevent path trimming if it is turned on. Path trimming affects `Display` impl
-/// of various rustc types, for example `std::vec::Vec` would be trimmed to `Vec`,
-/// if no other `Vec` is found.
-pub fn with_no_trimmed_paths<F: FnOnce() -> R, R>(f: F) -> R {
-    NO_TRIMMED_PATH.with(|flag| {
-        let old = flag.replace(true);
-        let result = f();
-        flag.set(old);
-        result
-    })
+            impl Drop for $helper {
+                fn drop(&mut self) {
+                    $tl.with(|c| c.set(self.0))
+                }
+            }
+        )+
+    }
 }
 
-/// Prevent selection of visible paths. `Display` impl of DefId will prefer visible (public) reexports of types as paths.
-pub fn with_no_visible_paths<F: FnOnce() -> R, R>(f: F) -> R {
-    NO_VISIBLE_PATH.with(|flag| {
-        let old = flag.replace(true);
-        let result = f();
-        flag.set(old);
-        result
-    })
-}
+define_helper!(
+    /// Avoids running any queries during any prints that occur
+    /// during the closure. This may alter the appearance of some
+    /// types (e.g. forcing verbose printing for opaque types).
+    /// This method is used during some queries (e.g. `explicit_item_bounds`
+    /// for opaque types), to ensure that any debug printing that
+    /// occurs during the query computation does not end up recursively
+    /// calling the same query.
+    fn with_no_queries(NoQueriesGuard, NO_QUERIES);
+    /// Force us to name impls with just the filename/line number. We
+    /// normally try to use types. But at some points, notably while printing
+    /// cycle errors, this can result in extra or suboptimal error output,
+    /// so this variable disables that check.
+    fn with_forced_impl_filename_line(ForcedImplGuard, FORCE_IMPL_FILENAME_LINE);
+    /// Adds the `crate::` prefix to paths where appropriate.
+    fn with_crate_prefix(CratePrefixGuard, SHOULD_PREFIX_WITH_CRATE);
+    /// Prevent path trimming if it is turned on. Path trimming affects `Display` impl
+    /// of various rustc types, for example `std::vec::Vec` would be trimmed to `Vec`,
+    /// if no other `Vec` is found.
+    fn with_no_trimmed_paths(NoTrimmedGuard, NO_TRIMMED_PATH);
+    /// Prevent selection of visible paths. `Display` impl of DefId will prefer
+    /// visible (public) reexports of types as paths.
+    fn with_no_visible_paths(NoVisibleGuard, NO_VISIBLE_PATH);
+);
 
 /// The "region highlights" are used to control region printing during
 /// specific error messages. When a "region highlight" is enabled, it
@@ -379,7 +372,7 @@ pub trait PrettyPrinter<'tcx>:
                         // in cases where the `extern crate foo` has non-trivial
                         // parents, e.g. it's nested in `impl foo::Trait for Bar`
                         // (see also issues #55779 and #87932).
-                        self = with_no_visible_paths(|| self.print_def_path(def_id, &[]))?;
+                        self = with_no_visible_paths!(self.print_def_path(def_id, &[])?);
 
                         return Ok((self, true));
                     }
@@ -655,7 +648,7 @@ pub trait PrettyPrinter<'tcx>:
                     return Ok(self);
                 }
 
-                return with_no_queries(|| {
+                return with_no_queries!({
                     let def_key = self.tcx().def_key(def_id);
                     if let Some(name) = def_key.disambiguated_data.data.get_opt_name() {
                         p!(write("{}", name));