Auto merge of #131387 - Zalathar:rollup-kprp512, r=Zalathar

Rollup of 7 pull requests

Successful merges:

 - #130824 (Add missing module flags for `-Zfunction-return=thunk-extern`)
 - #131170 (Fix `target_vendor` in non-IDF Xtensa ESP32 targets)
 - #131355 (Add tests for some old fixed issues)
 - #131369 (Update books)
 - #131370 (rustdoc: improve `<wbr>`-insertion for SCREAMING_CAMEL_CASE)
 - #131379 (Fix utf8-bom test)
 - #131385 (Un-vacation myself)

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

Author: bors

compiler/rustc_codegen_llvm/src/context.rs

@@ -19,7 +19,7 @@ use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
 use rustc_middle::{bug, span_bug};
 use rustc_session::Session;
 use rustc_session::config::{
-    BranchProtection, CFGuard, CFProtection, CrateType, DebugInfo, PAuthKey, PacRet,
+    BranchProtection, CFGuard, CFProtection, CrateType, DebugInfo, FunctionReturn, PAuthKey, PacRet,
 };
 use rustc_span::source_map::Spanned;
 use rustc_span::{DUMMY_SP, Span};
@@ -378,6 +378,18 @@ pub(crate) unsafe fn create_module<'ll>(
         }
     }
 
+    match sess.opts.unstable_opts.function_return {
+        FunctionReturn::Keep => {}
+        FunctionReturn::ThunkExtern => unsafe {
+            llvm::LLVMRustAddModuleFlagU32(
+                llmod,
+                llvm::LLVMModFlagBehavior::Override,
+                c"function_return_thunk_extern".as_ptr(),
+                1,
+            )
+        },
+    }
+
     match (sess.opts.unstable_opts.small_data_threshold, sess.target.small_data_threshold_support())
     {
         // Set up the small-data optimization limit for architectures that use

compiler/rustc_target/src/spec/targets/xtensa_esp32_none_elf.rs

@@ -15,6 +15,7 @@ pub(crate) fn target() -> Target {
         },
 
         options: TargetOptions {
+            vendor: "espressif".into(),
             cpu: "esp32".into(),
             linker: Some("xtensa-esp32-elf-gcc".into()),
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/targets/xtensa_esp32s2_none_elf.rs

@@ -15,6 +15,7 @@ pub(crate) fn target() -> Target {
         },
 
         options: TargetOptions {
+            vendor: "espressif".into(),
             cpu: "esp32-s2".into(),
             linker: Some("xtensa-esp32s2-elf-gcc".into()),
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/targets/xtensa_esp32s3_none_elf.rs

@@ -15,6 +15,7 @@ pub(crate) fn target() -> Target {
         },
 
         options: TargetOptions {
+            vendor: "espressif".into(),
             cpu: "esp32-s3".into(),
             linker: Some("xtensa-esp32s3-elf-gcc".into()),
             max_atomic_width: Some(32),

src/doc/book

@@ -108,7 +108,17 @@ impl<'a> fmt::Display for EscapeBodyTextWithWbr<'a> {
                 || pk.map_or(true, |(_, t)| t.chars().any(|c| c.is_uppercase()));
             let next_is_underscore = || pk.map_or(true, |(_, t)| t.contains('_'));
             let next_is_colon = || pk.map_or(true, |(_, t)| t.contains(':'));
-            if i - last > 3 && is_uppercase() && !next_is_uppercase() {
+            // Check for CamelCase.
+            //
+            // `i - last > 3` avoids turning FmRadio into Fm<wbr>Radio, which is technically
+            // correct, but needlessly bloated.
+            //
+            // is_uppercase && !next_is_uppercase checks for camelCase. HTTPSProxy,
+            // for example, should become HTTPS<wbr>Proxy.
+            //
+            // !next_is_underscore avoids turning TEST_RUN into TEST<wbr>_<wbr>RUN, which is also
+            // needlessly bloated.
+            if i - last > 3 && is_uppercase() && !next_is_uppercase() && !next_is_underscore() {
                 EscapeBodyText(&text[last..i]).fmt(fmt)?;
                 fmt.write_str("<wbr>")?;
                 last = i;

src/doc/embedded-book

@@ -24,6 +24,10 @@ fn escape_body_text_with_wbr() {
     assert_eq!(&E("first:second").to_string(), "first:<wbr>second");
     assert_eq!(&E("first::second").to_string(), "first::<wbr>second");
     assert_eq!(&E("MY_CONSTANT").to_string(), "MY_<wbr>CONSTANT");
+    assert_eq!(
+        &E("_SIDD_MASKED_NEGATIVE_POLARITY").to_string(),
+        "_SIDD_<wbr>MASKED_<wbr>NEGATIVE_<wbr>POLARITY"
+    );
     // a string won't get wrapped if it's less than 8 bytes
     assert_eq!(&E("HashSet").to_string(), "HashSet");
     // an individual word won't get wrapped if it's less than 4 bytes

src/doc/nomicon

@@ -70,6 +70,30 @@ macro_rules! impl_common_helpers {
                 self
             }
 
+            /// Configuration for the child process’s standard input (stdin) handle.
+            ///
+            /// See [`std::process::Command::stdin`].
+            pub fn stdin<T: Into<::std::process::Stdio>>(&mut self, cfg: T) -> &mut Self {
+                self.cmd.stdin(cfg);
+                self
+            }
+
+            /// Configuration for the child process’s standard output (stdout) handle.
+            ///
+            /// See [`std::process::Command::stdout`].
+            pub fn stdout<T: Into<::std::process::Stdio>>(&mut self, cfg: T) -> &mut Self {
+                self.cmd.stdout(cfg);
+                self
+            }
+
+            /// Configuration for the child process’s standard error (stderr) handle.
+            ///
+            /// See [`std::process::Command::stderr`].
+            pub fn stderr<T: Into<::std::process::Stdio>>(&mut self, cfg: T) -> &mut Self {
+                self.cmd.stderr(cfg);
+                self
+            }
+
             /// Inspect what the underlying [`Command`] is up to the
             /// current construction.
             pub fn inspect<I>(&mut self, inspector: I) -> &mut Self

src/doc/reference

@@ -1,6 +1,5 @@
 run-make/branch-protection-check-IBT/Makefile
 run-make/cat-and-grep-sanity-check/Makefile
-run-make/emit-to-stdout/Makefile
 run-make/extern-fn-reachable/Makefile
 run-make/incr-add-rust-src-component/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile

src/doc/rust-by-example

@@ -802,7 +802,6 @@ ui/consts/issue-70942-trait-vs-impl-mismatch.rs
 ui/consts/issue-73976-monomorphic.rs
 ui/consts/issue-73976-polymorphic.rs
 ui/consts/issue-76064.rs
-ui/consts/issue-77062-large-zst-array.rs
 ui/consts/issue-78655.rs
 ui/consts/issue-79137-monomorphic.rs
 ui/consts/issue-79137-toogeneric.rs

src/doc/rustc-dev-guide

@@ -26,3 +26,9 @@ pub fn foo() {
     // keep-thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
     // thunk-extern-keep-NOT: fn_ret_thunk_extern
 }
+
+// unset-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// keep-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// thunk-extern: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// keep-thunk-extern: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// thunk-extern-keep-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}

src/librustdoc/html/escape.rs

@@ -0,0 +1,73 @@
+//! If `-o -` or `--emit KIND=-` is provided, output should be written to stdout
+//! instead. Binary output (`obj`, `llvm-bc`, `link` and `metadata`)
+//! being written this way will result in an error if stdout is a tty.
+//! Multiple output types going to stdout will trigger an error too,
+//! as they would all be mixed together.
+//!
+//! See <https://github.com/rust-lang/rust/pull/111626>.
+
+use std::fs::File;
+
+use run_make_support::{diff, run_in_tmpdir, rustc};
+
+// Test emitting text outputs to stdout works correctly
+fn run_diff(name: &str, file_args: &[&str]) {
+    rustc().emit(format!("{name}={name}")).input("test.rs").args(file_args).run();
+    let out = rustc().emit(format!("{name}=-")).input("test.rs").run().stdout_utf8();
+    diff().expected_file(name).actual_text("stdout", &out).run();
+}
+
+// Test that emitting binary formats to a terminal gives the correct error
+fn run_terminal_err_diff(name: &str) {
+    #[cfg(not(windows))]
+    let terminal = File::create("/dev/ptmx").unwrap();
+    // FIXME: If this test fails and the compiler does print to the console,
+    // then this will produce a lot of output.
+    // We should spawn a new console instead to print stdout.
+    #[cfg(windows)]
+    let terminal = File::options().read(true).write(true).open(r"\\.\CONOUT$").unwrap();
+
+    let err = File::create(name).unwrap();
+    rustc().emit(format!("{name}=-")).input("test.rs").stdout(terminal).stderr(err).run_fail();
+    diff().expected_file(format!("emit-{name}.stderr")).actual_file(name).run();
+}
+
+fn main() {
+    run_in_tmpdir(|| {
+        run_diff("asm", &[]);
+        run_diff("llvm-ir", &[]);
+        run_diff("dep-info", &["-Zdep-info-omit-d-target=yes"]);
+        run_diff("mir", &[]);
+
+        run_terminal_err_diff("llvm-bc");
+        run_terminal_err_diff("obj");
+        run_terminal_err_diff("metadata");
+        run_terminal_err_diff("link");
+
+        // Test error for emitting multiple types to stdout
+        rustc()
+            .input("test.rs")
+            .emit("asm=-")
+            .emit("llvm-ir=-")
+            .emit("dep-info=-")
+            .emit("mir=-")
+            .stderr(File::create("multiple-types").unwrap())
+            .run_fail();
+        diff().expected_file("emit-multiple-types.stderr").actual_file("multiple-types").run();
+
+        // Same as above, but using `-o`
+        rustc()
+            .input("test.rs")
+            .output("-")
+            .emit("asm,llvm-ir,dep-info,mir")
+            .stderr(File::create("multiple-types-option-o").unwrap())
+            .run_fail();
+        diff()
+            .expected_file("emit-multiple-types.stderr")
+            .actual_file("multiple-types-option-o")
+            .run();
+
+        // Test that `-o -` redirected to a file works correctly (#26719)
+        rustc().input("test.rs").output("-").stdout(File::create("out-stdout").unwrap()).run();
+    });
+}

src/librustdoc/html/escape/tests.rs

@@ -1,4 +1,5 @@
 //@ build-pass
+pub static FOO: [(); usize::MAX] = [(); usize::MAX];
 
 fn main() {
     let _ = &[(); usize::MAX];

src/tools/run-make-support/src/macros.rs

@@ -0,0 +1,32 @@
+//@ check-pass
+//! Tests that associated type projections normalize properly in the presence of HRTBs.
+//! Original issue: <https://github.com/rust-lang/rust/issues/30472>
+
+
+pub trait MyFrom<T> {}
+impl<T> MyFrom<T> for T {}
+
+pub trait MyInto<T> {}
+impl<T, U> MyInto<U> for T where U: MyFrom<T> {}
+
+
+pub trait A<'self_> {
+    type T;
+}
+pub trait B: for<'self_> A<'self_> {
+    // Originally caused the `type U = usize` example below to fail with a type mismatch error
+    type U: for<'self_> MyFrom<<Self as A<'self_>>::T>;
+}
+
+
+pub struct M;
+impl<'self_> A<'self_> for M {
+    type T = usize;
+}
+
+impl B for M {
+    type U = usize;
+}
+
+
+fn main() {}

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -0,0 +1,22 @@
+//@ check-pass
+//! Tests that a HRTB + FnOnce bound involving an associated type don't prevent
+//! a function pointer from implementing `Fn` traits.
+//! Test for <https://github.com/rust-lang/rust/issues/28994>
+
+trait LifetimeToType<'a> {
+    type Out;
+}
+
+impl<'a> LifetimeToType<'a> for () {
+    type Out = &'a ();
+}
+
+fn id<'a>(val: &'a ()) -> <() as LifetimeToType<'a>>::Out {
+    val
+}
+
+fn assert_fn<F: for<'a> FnOnce(&'a ()) -> <() as LifetimeToType<'a>>::Out>(_func: F) { }
+
+fn main() {
+    assert_fn(id);
+}

src/tools/tidy/src/issues.txt

@@ -0,0 +1,14 @@
+//@ check-pass
+//! Tests that HRTB impl selection covers type parameters not directly related
+//! to the trait.
+//! Test for <https://github.com/rust-lang/rust/issues/30867>
+
+#![crate_type = "lib"]
+
+trait Unary<T> {}
+impl<T, U, F: Fn(T) -> U> Unary<T> for F {}
+fn unary<F: for<'a> Unary<&'a T>, T>() {}
+
+pub fn test<F: for<'a> Fn(&'a i32) -> &'a i32>() {
+    unary::<F, i32>()
+}

tests/codegen/function-return.rs

@@ -1,6 +1,4 @@
+// This file has utf-8 BOM, it should be compiled normally without error.
 //@ run-pass
-//
-
-// This file has utf-8 BOM, it should be compiled normally without error.
 
 pub fn main() {}

tests/run-make/emit-to-stdout/Makefile

@@ -926,7 +926,6 @@ users_on_vacation = [
     "jhpratt",
     "jyn514",
     "oli-obk",
-    "jieyouxu",
 ]
 
 [assign.adhoc_groups]