Auto merge of #104083 - JohnTitor:rollup-lo3wbzs, r=JohnTitor

Rollup of 9 pull requests

Successful merges:

 - #103885 (rustdoc: various cross-crate reexport fixes)
 - #103914 (Make underscore_literal_suffix a hard error.)
 - #104045 (Add type_array to BaseTypeMethods)
 - #104056 (Vec: IntoIterator signature consistency)
 - #104059 (Fix typo in `rustc_middle/lint.rs`)
 - #104062 (rustdoc: remove unused CSS `#sidebar-filler`)
 - #104065 (Migrate rust logo filter to CSS variables)
 - #104066 (LLVM 16: Update RISCV data layout)
 - #104074 (rustdoc: Add an example for round that is different from truncate)

Failed merges:

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

13 files changed, 44 insertions, 46 deletions

diff --git a/compiler/rustc_codegen_gcc/src/type_.rs b/compiler/rustc_codegen_gcc/src/type_.rs
index 68bdb8d4e55..862ed62c68b 100644
--- a/compiler/rustc_codegen_gcc/src/type_.rs
+++ b/compiler/rustc_codegen_gcc/src/type_.rs
@@ -201,6 +201,27 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     fn val_ty(&self, value: RValue<'gcc>) -> Type<'gcc> {
         value.get_type()
     }
+
+    fn type_array(&self, ty: Type<'gcc>, mut len: u64) -> Type<'gcc> {
+        if let Some(struct_type) = ty.is_struct() {
+            if struct_type.get_field_count() == 0 {
+                // NOTE: since gccjit only supports i32 for the array size and libcore's tests uses a
+                // size of usize::MAX in test_binary_search, we workaround this by setting the size to
+                // zero for ZSTs.
+                // FIXME(antoyo): fix gccjit API.
+                len = 0;
+            }
+        }
+
+        // NOTE: see note above. Some other test uses usize::MAX.
+        if len == u64::MAX {
+            len = 0;
+        }
+
+        let len: i32 = len.try_into().expect("array len");
+
+        self.context.new_array_type(None, ty, len)
+    }
 }
 
 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
@@ -227,27 +248,6 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         self.context.new_opaque_struct_type(None, name)
     }
 
-    pub fn type_array(&self, ty: Type<'gcc>, mut len: u64) -> Type<'gcc> {
-        if let Some(struct_type) = ty.is_struct() {
-            if struct_type.get_field_count() == 0 {
-                // NOTE: since gccjit only supports i32 for the array size and libcore's tests uses a
-                // size of usize::MAX in test_binary_search, we workaround this by setting the size to
-                // zero for ZSTs.
-                // FIXME(antoyo): fix gccjit API.
-                len = 0;
-            }
-        }
-
-        // NOTE: see note above. Some other test uses usize::MAX.
-        if len == u64::MAX {
-            len = 0;
-        }
-
-        let len: i32 = len.try_into().expect("array len");
-
-        self.context.new_array_type(None, ty, len)
-    }
-
     pub fn type_bool(&self) -> Type<'gcc> {
         self.context.new_type::<bool>()
     }
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 79ddfd884df..c22ec128dac 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -158,6 +158,10 @@ pub unsafe fn create_module<'ll>(
         if sess.target.arch == "s390x" {
             target_data_layout = target_data_layout.replace("-v128:64", "");
         }
+
+        if sess.target.arch == "riscv64" {
+            target_data_layout = target_data_layout.replace("-n32:64-", "-n64-");
+        }
     }
 
     // Ensure the data-layout values hardcoded remain the defaults.
diff --git a/compiler/rustc_codegen_llvm/src/type_.rs b/compiler/rustc_codegen_llvm/src/type_.rs
index eeb38d4ecf5..5eec7dc6130 100644
--- a/compiler/rustc_codegen_llvm/src/type_.rs
+++ b/compiler/rustc_codegen_llvm/src/type_.rs
@@ -127,10 +127,6 @@ impl<'ll> CodegenCx<'ll, '_> {
     pub(crate) fn type_variadic_func(&self, args: &[&'ll Type], ret: &'ll Type) -> &'ll Type {
         unsafe { llvm::LLVMFunctionType(ret, args.as_ptr(), args.len() as c_uint, True) }
     }
-
-    pub(crate) fn type_array(&self, ty: &'ll Type, len: u64) -> &'ll Type {
-        unsafe { llvm::LLVMRustArrayType(ty, len) }
-    }
 }
 
 impl<'ll, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx> {
@@ -231,6 +227,10 @@ impl<'ll, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx> {
     fn val_ty(&self, v: &'ll Value) -> &'ll Type {
         common::val_ty(v)
     }
+
+    fn type_array(&self, ty: &'ll Type, len: u64) -> &'ll Type {
+        unsafe { llvm::LLVMRustArrayType(ty, len) }
+    }
 }
 
 impl Type {
diff --git a/compiler/rustc_codegen_ssa/src/traits/type_.rs b/compiler/rustc_codegen_ssa/src/traits/type_.rs
index bdc6a91cf6a..86481d5d758 100644
--- a/compiler/rustc_codegen_ssa/src/traits/type_.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/type_.rs
@@ -22,6 +22,7 @@ pub trait BaseTypeMethods<'tcx>: Backend<'tcx> {
     fn type_f32(&self) -> Self::Type;
     fn type_f64(&self) -> Self::Type;
 
+    fn type_array(&self, ty: Self::Type, len: u64) -> Self::Type;
     fn type_func(&self, args: &[Self::Type], ret: Self::Type) -> Self::Type;
     fn type_struct(&self, els: &[Self::Type], packed: bool) -> Self::Type;
     fn type_kind(&self, ty: Self::Type) -> TypeKind;
diff --git a/compiler/rustc_lexer/src/lib.rs b/compiler/rustc_lexer/src/lib.rs
index 51515976e4e..dd2c09cae02 100644
--- a/compiler/rustc_lexer/src/lib.rs
+++ b/compiler/rustc_lexer/src/lib.rs
@@ -88,7 +88,9 @@ pub enum TokenKind {
     /// tokens.
     UnknownPrefix,
 
-    /// Examples: `"12_u8"`, `"1.0e-40"`, `b"123`.
+    /// Examples: `12u8`, `1.0e-40`, `b"123"`. Note that `_` is an invalid
+    /// suffix, but may be present here on string and float literals. Users of
+    /// this type will need to check for and reject that case.
     ///
     /// See [LiteralKind] for more details.
     Literal { kind: LiteralKind, suffix_start: u32 },
@@ -840,12 +842,13 @@ impl Cursor<'_> {
         self.eat_decimal_digits()
     }
 
-    // Eats the suffix of the literal, e.g. "_u8".
+    // Eats the suffix of the literal, e.g. "u8".
     fn eat_literal_suffix(&mut self) {
         self.eat_identifier();
     }
 
-    // Eats the identifier.
+    // Eats the identifier. Note: succeeds on `_`, which isn't a valid
+    // identifer.
     fn eat_identifier(&mut self) {
         if !is_id_start(self.first()) {
             return;
diff --git a/compiler/rustc_middle/src/lint.rs b/compiler/rustc_middle/src/lint.rs
index 79522bd0b2b..51df42f6d14 100644
--- a/compiler/rustc_middle/src/lint.rs
+++ b/compiler/rustc_middle/src/lint.rs
@@ -276,7 +276,7 @@ pub fn explain_lint_level_source(
 
 /// The innermost function for emitting lints.
 ///
-/// If you are loocking to implement a lint, look for higher level functions,
+/// If you are looking to implement a lint, look for higher level functions,
 /// for example:
 /// - [`TyCtxt::emit_spanned_lint`]
 /// - [`TyCtxt::struct_span_lint_hir`]
diff --git a/compiler/rustc_parse/src/lexer/mod.rs b/compiler/rustc_parse/src/lexer/mod.rs
index 462bce16ad7..de8f1c00c12 100644
--- a/compiler/rustc_parse/src/lexer/mod.rs
+++ b/compiler/rustc_parse/src/lexer/mod.rs
@@ -175,20 +175,10 @@ impl<'a> StringReader<'a> {
                         if string == "_" {
                             self.sess
                                 .span_diagnostic
-                                .struct_span_warn(
+                                .struct_span_err(
                                     self.mk_sp(suffix_start, self.pos),
                                     "underscore literal suffix is not allowed",
                                 )
-                                .warn(
-                                    "this was previously accepted by the compiler but is \
-                                       being phased out; it will become a hard error in \
-                                       a future release!",
-                                )
-                                .note(
-                                    "see issue #42326 \
-                                     <https://github.com/rust-lang/rust/issues/42326> \
-                                     for more information",
-                                )
                                 .emit();
                             None
                         } else {
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs
index 0539eca6c1f..8281bac10f8 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_freebsd.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-freebsd".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs
index 7d1bf228c37..90dccb28063 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-linux-gnu".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs
index f04f8a48bc8..1a56c78e685 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-linux-musl".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs
index 67806d578c8..409b0b26961 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_none_elf.rs
@@ -3,7 +3,7 @@ use crate::spec::{RelocModel, Target, TargetOptions};
 
 pub fn target() -> Target {
     Target {
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         llvm_target: "riscv64".into(),
         pointer_width: 64,
         arch: "riscv64".into(),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs
index cd10f3afaac..ade9d77624b 100644
--- a/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_openbsd.rs
@@ -4,7 +4,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "riscv64-unknown-openbsd".into(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         arch: "riscv64".into(),
         options: TargetOptions {
             code_model: Some(CodeModel::Medium),
diff --git a/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs b/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs
index f371e09bed7..87aba9171b4 100644
--- a/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs
+++ b/compiler/rustc_target/src/spec/riscv64imac_unknown_none_elf.rs
@@ -3,7 +3,7 @@ use crate::spec::{RelocModel, Target, TargetOptions};
 
 pub fn target() -> Target {
     Target {
-        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".into(),
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
         llvm_target: "riscv64".into(),
         pointer_width: 64,
         arch: "riscv64".into(),