Auto merge of rust-lang#106786 - JohnTitor:rollup-8f4vk8m, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - rust-lang#105795 (Stabilize `abi_efiapi` feature)
 - rust-lang#106446 ([LSDA] Take ttype_index into account when taking unwind action)
 - rust-lang#106675 (Mark ZST as FFI-safe if all its fields are PhantomData)
 - rust-lang#106740 (Adding a hint on iterator type errors)
 - rust-lang#106741 (Fix reexport of `doc(hidden)` item)
 - rust-lang#106759 (Revert "Make nested RPITIT inherit the parent opaque's generics.")
 - rust-lang#106772 (Re-add mw to review rotation)
 - rust-lang#106778 (Exclude formatting commit from blame)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

.git-blame-ignore-revs

@@ -6,3 +6,5 @@ a06baa56b95674fc626b3c3fd680d6a65357fe60
 971c549ca334b7b7406e61e958efcca9c4152822
 # refactor infcx building
 283abbf0e7d20176f76006825b5c52e9a4234e4c
+# format libstd/sys
+c34fbfaad38cf5829ef5cfe780dc9d58480adeaa

compiler/rustc_feature/src/accepted.rs

@@ -48,6 +48,8 @@ declare_features! (
 
     /// Allows `#[target_feature(...)]` on aarch64 platforms
     (accepted, aarch64_target_feature, "1.61.0", Some(44839), None),
+    /// Allows using the `efiapi` ABI.
+    (accepted, abi_efiapi, "CURRENT_RUSTC_VERSION", Some(65815), None),
     /// Allows the sysV64 ABI to be specified on all platforms
     /// instead of just the platforms on which it is the C ABI.
     (accepted, abi_sysv64, "1.24.0", Some(36167), None),

compiler/rustc_feature/src/active.rs

@@ -281,8 +281,6 @@ declare_features! (
     (active, abi_avr_interrupt, "1.45.0", Some(69664), None),
     /// Allows `extern "C-cmse-nonsecure-call" fn()`.
     (active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None),
-    /// Allows using the `efiapi` ABI.
-    (active, abi_efiapi, "1.40.0", Some(65815), None),
     /// Allows `extern "msp430-interrupt" fn()`.
     (active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
     /// Allows `extern "ptx-*" fn()`.

compiler/rustc_hir_analysis/src/collect/generics_of.rs

@@ -4,6 +4,7 @@ use hir::{
     GenericParamKind, HirId, Node,
 };
 use rustc_hir as hir;
+use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_session::lint;
@@ -142,7 +143,20 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::Generics {
             Some(tcx.typeck_root_def_id(def_id))
         }
         Node::Item(item) => match item.kind {
-            ItemKind::OpaqueTy(hir::OpaqueTy { .. }) => {
+            ItemKind::OpaqueTy(hir::OpaqueTy {
+                origin:
+                    hir::OpaqueTyOrigin::FnReturn(fn_def_id) | hir::OpaqueTyOrigin::AsyncFn(fn_def_id),
+                in_trait,
+                ..
+            }) => {
+                if in_trait {
+                    assert!(matches!(tcx.def_kind(fn_def_id), DefKind::AssocFn))
+                } else {
+                    assert!(matches!(tcx.def_kind(fn_def_id), DefKind::AssocFn | DefKind::Fn))
+                }
+                Some(fn_def_id.to_def_id())
+            }
+            ItemKind::OpaqueTy(hir::OpaqueTy { origin: hir::OpaqueTyOrigin::TyAlias, .. }) => {
                 let parent_id = tcx.hir().get_parent_item(hir_id);
                 assert_ne!(parent_id, hir::CRATE_OWNER_ID);
                 debug!("generics_of: parent of opaque ty {:?} is {:?}", def_id, parent_id);

compiler/rustc_lint/src/types.rs

@@ -878,39 +878,39 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
     ) -> FfiResult<'tcx> {
         use FfiResult::*;
 
-        if def.repr().transparent() {
+        let transparent_safety = def.repr().transparent().then(|| {
             // Can assume that at most one field is not a ZST, so only check
             // that field's type for FFI-safety.
             if let Some(field) = transparent_newtype_field(self.cx.tcx, variant) {
-                self.check_field_type_for_ffi(cache, field, substs)
+                return self.check_field_type_for_ffi(cache, field, substs);
             } else {
                 // All fields are ZSTs; this means that the type should behave
-                // like (), which is FFI-unsafe
+                // like (), which is FFI-unsafe... except if all fields are PhantomData,
+                // which is tested for below
                 FfiUnsafe { ty, reason: fluent::lint_improper_ctypes_struct_zst, help: None }
             }
-        } else {
-            // We can't completely trust repr(C) markings; make sure the fields are
-            // actually safe.
-            let mut all_phantom = !variant.fields.is_empty();
-            for field in &variant.fields {
-                match self.check_field_type_for_ffi(cache, &field, substs) {
-                    FfiSafe => {
-                        all_phantom = false;
-                    }
-                    FfiPhantom(..) if def.is_enum() => {
-                        return FfiUnsafe {
-                            ty,
-                            reason: fluent::lint_improper_ctypes_enum_phantomdata,
-                            help: None,
-                        };
-                    }
-                    FfiPhantom(..) => {}
-                    r => return r,
+        });
+        // We can't completely trust repr(C) markings; make sure the fields are
+        // actually safe.
+        let mut all_phantom = !variant.fields.is_empty();
+        for field in &variant.fields {
+            match self.check_field_type_for_ffi(cache, &field, substs) {
+                FfiSafe => {
+                    all_phantom = false;
                 }
+                FfiPhantom(..) if !def.repr().transparent() && def.is_enum() => {
+                    return FfiUnsafe {
+                        ty,
+                        reason: fluent::lint_improper_ctypes_enum_phantomdata,
+                        help: None,
+                    };
+                }
+                FfiPhantom(..) => {}
+                r => return transparent_safety.unwrap_or(r),
             }
-
-            if all_phantom { FfiPhantom(ty) } else { FfiSafe }
         }
+
+        if all_phantom { FfiPhantom(ty) } else { transparent_safety.unwrap_or(FfiSafe) }
     }
 
     /// Checks if the given type is "ffi-safe" (has a stable, well-defined

compiler/rustc_target/src/spec/abi.rs

@@ -149,7 +149,7 @@ pub fn is_stable(name: &str) -> Result<(), AbiDisabled> {
     match name {
         // Stable
         "Rust" | "C" | "cdecl" | "stdcall" | "fastcall" | "aapcs" | "win64" | "sysv64"
-        | "system" => Ok(()),
+        | "system" | "efiapi" => Ok(()),
         "rust-intrinsic" => Err(AbiDisabled::Unstable {
             feature: sym::intrinsics,
             explain: "intrinsics are subject to change",
@@ -198,10 +198,6 @@ pub fn is_stable(name: &str) -> Result<(), AbiDisabled> {
             feature: sym::abi_avr_interrupt,
             explain: "avr-interrupt and avr-non-blocking-interrupt ABIs are experimental and subject to change",
         }),
-        "efiapi" => Err(AbiDisabled::Unstable {
-            feature: sym::abi_efiapi,
-            explain: "efiapi ABI is experimental and subject to change",
-        }),
         "C-cmse-nonsecure-call" => Err(AbiDisabled::Unstable {
             feature: sym::abi_c_cmse_nonsecure_call,
             explain: "C-cmse-nonsecure-call ABI is experimental and subject to change",

library/core/src/iter/traits/iterator.rs

@@ -58,6 +58,11 @@ fn _assert_is_object_safe(_: &dyn Iterator<Item = ()>) {}
         note = "if you want to iterate between `start` until a value `end`, use the exclusive range \
               syntax `start..end` or the inclusive range syntax `start..=end`"
     ),
+    on(
+        _Self = "{float}",
+        note = "if you want to iterate between `start` until a value `end`, use the exclusive range \
+              syntax `start..end` or the inclusive range syntax `start..=end`"
+    ),
     label = "`{Self}` is not an iterator",
     message = "`{Self}` is not an iterator"
 )]

library/std/src/personality/dwarf/eh.rs

@@ -84,7 +84,7 @@ pub unsafe fn find_eh_action(lsda: *const u8, context: &EHContext<'_>) -> Result
             let cs_start = read_encoded_pointer(&mut reader, context, call_site_encoding)?;
             let cs_len = read_encoded_pointer(&mut reader, context, call_site_encoding)?;
             let cs_lpad = read_encoded_pointer(&mut reader, context, call_site_encoding)?;
-            let cs_action = reader.read_uleb128();
+            let cs_action_entry = reader.read_uleb128();
             // Callsite table is sorted by cs_start, so if we've passed the ip, we
             // may stop searching.
             if ip < func_start + cs_start {
@@ -95,7 +95,7 @@ pub unsafe fn find_eh_action(lsda: *const u8, context: &EHContext<'_>) -> Result
                     return Ok(EHAction::None);
                 } else {
                     let lpad = lpad_base + cs_lpad;
-                    return Ok(interpret_cs_action(cs_action, lpad));
+                    return Ok(interpret_cs_action(action_table as *mut u8, cs_action_entry, lpad));
                 }
             }
         }
@@ -113,26 +113,39 @@ pub unsafe fn find_eh_action(lsda: *const u8, context: &EHContext<'_>) -> Result
         let mut idx = ip;
         loop {
             let cs_lpad = reader.read_uleb128();
-            let cs_action = reader.read_uleb128();
+            let cs_action_entry = reader.read_uleb128();
             idx -= 1;
             if idx == 0 {
                 // Can never have null landing pad for sjlj -- that would have
                 // been indicated by a -1 call site index.
                 let lpad = (cs_lpad + 1) as usize;
-                return Ok(interpret_cs_action(cs_action, lpad));
+                return Ok(interpret_cs_action(action_table as *mut u8, cs_action_entry, lpad));
             }
         }
     }
 }
 
-fn interpret_cs_action(cs_action: u64, lpad: usize) -> EHAction {
-    if cs_action == 0 {
-        // If cs_action is 0 then this is a cleanup (Drop::drop). We run these
+unsafe fn interpret_cs_action(
+    action_table: *mut u8,
+    cs_action_entry: u64,
+    lpad: usize,
+) -> EHAction {
+    if cs_action_entry == 0 {
+        // If cs_action_entry is 0 then this is a cleanup (Drop::drop). We run these
         // for both Rust panics and foreign exceptions.
         EHAction::Cleanup(lpad)
     } else {
-        // Stop unwinding Rust panics at catch_unwind.
-        EHAction::Catch(lpad)
+        // If lpad != 0 and cs_action_entry != 0, we have to check ttype_index.
+        // If ttype_index == 0 under the condition, we take cleanup action.
+        let action_record = (action_table as *mut u8).offset(cs_action_entry as isize - 1);
+        let mut action_reader = DwarfReader::new(action_record);
+        let ttype_index = action_reader.read_sleb128();
+        if ttype_index == 0 {
+            EHAction::Cleanup(lpad)
+        } else {
+            // Stop unwinding Rust panics at catch_unwind.
+            EHAction::Catch(lpad)
+        }
     }
 }
 

src/doc/unstable-book/src/language-features/abi-efiapi.md

@@ -12,5 +12,6 @@ pub(crate) const STRIP_PRIV_IMPORTS: Pass = Pass {
 };
 
 pub(crate) fn strip_priv_imports(krate: clean::Crate, cx: &mut DocContext<'_>) -> clean::Crate {
-    ImportStripper { tcx: cx.tcx }.fold_crate(krate)
+    let is_json_output = cx.output_format.is_json() && !cx.show_coverage;
+    ImportStripper { tcx: cx.tcx, is_json_output }.fold_crate(krate)
 }