Merge pull request #4527 from rust-lang/rustup-2025-08-15

Automatic Rustup

7 files changed, 43 insertions, 28 deletions

diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
index 009e7e2487b..043123fcab2 100644
--- a/compiler/rustc_codegen_llvm/src/abi.rs
+++ b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -24,6 +24,7 @@ use crate::attributes::{self, llfn_attrs_from_instance};
 use crate::builder::Builder;
 use crate::context::CodegenCx;
 use crate::llvm::{self, Attribute, AttributePlace};
+use crate::llvm_util;
 use crate::type_::Type;
 use crate::type_of::LayoutLlvmExt;
 use crate::value::Value;
@@ -500,7 +501,16 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
                     }
                 }
                 PassMode::Indirect { attrs, meta_attrs: None, on_stack: false } => {
-                    apply(attrs);
+                    let i = apply(attrs);
+                    if cx.sess().opts.optimize != config::OptLevel::No
+                        && llvm_util::get_version() >= (21, 0, 0)
+                    {
+                        attributes::apply_to_llfn(
+                            llfn,
+                            llvm::AttributePlace::Argument(i),
+                            &[llvm::AttributeKind::DeadOnReturn.create_attr(cx.llcx)],
+                        );
+                    }
                 }
                 PassMode::Indirect { attrs, meta_attrs: Some(meta_attrs), on_stack } => {
                     assert!(!on_stack);
diff --git a/compiler/rustc_codegen_llvm/src/base.rs b/compiler/rustc_codegen_llvm/src/base.rs
index 5dda836988c..9cc5d8dbc21 100644
--- a/compiler/rustc_codegen_llvm/src/base.rs
+++ b/compiler/rustc_codegen_llvm/src/base.rs
@@ -18,9 +18,10 @@ use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
 use rustc_codegen_ssa::mono_item::MonoItemExt;
 use rustc_codegen_ssa::traits::*;
 use rustc_data_structures::small_c_str::SmallCStr;
+use rustc_hir::attrs::Linkage;
 use rustc_middle::dep_graph;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
-use rustc_middle::mir::mono::{Linkage, Visibility};
+use rustc_middle::mir::mono::Visibility;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::config::DebugInfo;
 use rustc_span::Symbol;
diff --git a/compiler/rustc_codegen_llvm/src/consts.rs b/compiler/rustc_codegen_llvm/src/consts.rs
index 6b06daf3477..9ec7b0f80ae 100644
--- a/compiler/rustc_codegen_llvm/src/consts.rs
+++ b/compiler/rustc_codegen_llvm/src/consts.rs
@@ -4,6 +4,7 @@ use rustc_abi::{Align, HasDataLayout, Primitive, Scalar, Size, WrappingRange};
 use rustc_codegen_ssa::common;
 use rustc_codegen_ssa::traits::*;
 use rustc_hir::LangItem;
+use rustc_hir::attrs::Linkage;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
@@ -11,7 +12,7 @@ use rustc_middle::mir::interpret::{
     Allocation, ConstAllocation, ErrorHandled, InitChunk, Pointer, Scalar as InterpScalar,
     read_target_uint,
 };
-use rustc_middle::mir::mono::{Linkage, MonoItem};
+use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::ty::layout::{HasTypingEnv, LayoutOf};
 use rustc_middle::ty::{self, Instance};
 use rustc_middle::{bug, span_bug};
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index ee77774c688..27ae729a531 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -213,6 +213,12 @@ pub(crate) unsafe fn create_module<'ll>(
             target_data_layout = target_data_layout.replace("p8:128:128:128:48", "p8:128:128")
         }
     }
+    if llvm_version < (22, 0, 0) {
+        if sess.target.arch == "avr" {
+            // LLVM 22.0 updated the default layout on avr: https://github.com/llvm/llvm-project/pull/153010
+            target_data_layout = target_data_layout.replace("n8:16", "n8")
+        }
+    }
 
     // Ensure the data-layout values hardcoded remain the defaults.
     {
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
index 6cbf2dbf7d3..2c3a84499ac 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
@@ -533,31 +533,26 @@ impl<'ll, 'tcx> DebugInfoCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {
             // First, let's see if this is a method within an inherent impl. Because
             // if yes, we want to make the result subroutine DIE a child of the
             // subroutine's self-type.
-            if let Some(impl_def_id) = cx.tcx.impl_of_assoc(instance.def_id()) {
-                // If the method does *not* belong to a trait, proceed
-                if cx.tcx.trait_id_of_impl(impl_def_id).is_none() {
-                    let impl_self_ty = cx.tcx.instantiate_and_normalize_erasing_regions(
-                        instance.args,
-                        cx.typing_env(),
-                        cx.tcx.type_of(impl_def_id),
-                    );
-
-                    // Only "class" methods are generally understood by LLVM,
-                    // so avoid methods on other types (e.g., `<*mut T>::null`).
-                    if let ty::Adt(def, ..) = impl_self_ty.kind()
-                        && !def.is_box()
-                    {
-                        // Again, only create type information if full debuginfo is enabled
-                        if cx.sess().opts.debuginfo == DebugInfo::Full && !impl_self_ty.has_param()
-                        {
-                            return (type_di_node(cx, impl_self_ty), true);
-                        } else {
-                            return (namespace::item_namespace(cx, def.did()), false);
-                        }
+            // For trait method impls we still use the "parallel namespace"
+            // strategy
+            if let Some(imp_def_id) = cx.tcx.inherent_impl_of_assoc(instance.def_id()) {
+                let impl_self_ty = cx.tcx.instantiate_and_normalize_erasing_regions(
+                    instance.args,
+                    cx.typing_env(),
+                    cx.tcx.type_of(imp_def_id),
+                );
+
+                // Only "class" methods are generally understood by LLVM,
+                // so avoid methods on other types (e.g., `<*mut T>::null`).
+                if let ty::Adt(def, ..) = impl_self_ty.kind()
+                    && !def.is_box()
+                {
+                    // Again, only create type information if full debuginfo is enabled
+                    if cx.sess().opts.debuginfo == DebugInfo::Full && !impl_self_ty.has_param() {
+                        return (type_di_node(cx, impl_self_ty), true);
+                    } else {
+                        return (namespace::item_namespace(cx, def.did()), false);
                     }
-                } else {
-                    // For trait method impls we still use the "parallel namespace"
-                    // strategy
                 }
             }
 
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 75d3d27f74e..ad3c3d5932e 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -249,6 +249,7 @@ pub(crate) enum AttributeKind {
     FnRetThunkExtern = 41,
     Writable = 42,
     DeadOnUnwind = 43,
+    DeadOnReturn = 44,
 }
 
 /// LLVMIntPredicate
diff --git a/compiler/rustc_codegen_llvm/src/mono_item.rs b/compiler/rustc_codegen_llvm/src/mono_item.rs
index f9edaded60d..5075befae8a 100644
--- a/compiler/rustc_codegen_llvm/src/mono_item.rs
+++ b/compiler/rustc_codegen_llvm/src/mono_item.rs
@@ -1,8 +1,9 @@
 use rustc_codegen_ssa::traits::*;
+use rustc_hir::attrs::Linkage;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_middle::bug;
-use rustc_middle::mir::mono::{Linkage, Visibility};
+use rustc_middle::mir::mono::Visibility;
 use rustc_middle::ty::layout::{FnAbiOf, HasTypingEnv, LayoutOf};
 use rustc_middle::ty::{self, Instance, TypeVisitableExt};
 use rustc_session::config::CrateType;