Merge pull request rust-lang#282 from rust-lang/sync_from_rust_2023_06_11

Sync from rust 2023 06 11

Author: antoyo

Cargo.toml

@@ -25,7 +25,7 @@ master = ["gccjit/master"]
 gccjit = { git = "https://github.com/antoyo/gccjit.rs" }
 
 # Local copy.
-# gccjit = { path = "../gccjit.rs" }
+#gccjit = { path = "../gccjit.rs" }
 
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
 

Readme.md

@@ -193,7 +193,7 @@ Using git-subtree with `rustc` requires a patched git to make it work.
 The PR that is needed is [here](https://github.com/gitgitgadget/git/pull/493).
 Use the following instructions to install it:
 
-```
+```bash
 git clone git@github.com:tqc/git.git
 cd git
 git checkout tqc/subtree
@@ -204,6 +204,21 @@ make
 cp git-subtree ~/bin
 ```
 
+Then, do a sync with this command:
+
+```bash
+PATH="$HOME/bin:$PATH" ~/bin/git-subtree push -P compiler/rustc_codegen_gcc/ ../rustc_codegen_gcc/ sync_branch_name
+cd ../rustc_codegen_gcc
+git checkout master
+git pull
+git checkout sync_branch_name
+git merge master
+```
+
+TODO: write a script that does the above.
+
+https://rust-lang.zulipchat.com/#narrow/stream/301329-t-devtools/topic/subtree.20madness/near/258877725
+
 ### How to use [mem-trace](https://github.com/antoyo/mem-trace)
 
 `rustc` needs to be built without `jemalloc` so that `mem-trace` can overload `malloc` since `jemalloc` is linked statically, so a `LD_PRELOAD`-ed library won't a chance to intercept the calls to `malloc`.

build_sysroot/Cargo.toml

@@ -9,6 +9,7 @@ compiler_builtins = "0.1"
 alloc = { path = "./sysroot_src/library/alloc" }
 std = { path = "./sysroot_src/library/std", features = ["panic_unwind", "backtrace"] }
 test = { path = "./sysroot_src/library/test" }
+proc_macro = { path = "./sysroot_src/library/proc_macro" }
 
 [patch.crates-io]
 rustc-std-workspace-core = { path = "./sysroot_src/library/rustc-std-workspace-core" }

build_sysroot/prepare_sysroot_src.sh

@@ -29,10 +29,10 @@ git config user.name || git config user.name "None"
 
 git commit -m "Initial commit" -q
 for file in $(ls ../../patches/ | grep -v patcha); do
-echo "[GIT] apply" $file
-git apply ../../patches/$file
-git add -A
-git commit --no-gpg-sign -m "Patch $file"
+    echo "[GIT] apply" $file
+    git apply ../../patches/$file
+    git add -A
+    git commit --no-gpg-sign -m "Patch $file"
 done
 popd
 

example/alloc_example.rs

@@ -1,4 +1,4 @@
-#![feature(start, box_syntax, core_intrinsics, alloc_error_handler, lang_items)]
+#![feature(start, core_intrinsics, alloc_error_handler, lang_items)]
 #![no_std]
 
 extern crate alloc;
@@ -38,7 +38,7 @@ unsafe extern "C" fn _Unwind_Resume() {
 
 #[start]
 fn main(_argc: isize, _argv: *const *const u8) -> isize {
-    let world: Box<&str> = box "Hello World!\0";
+    let world: Box<&str> = Box::new("Hello World!\0");
     unsafe {
         puts(*world as *const str as *const u8);
     }

example/alloc_system.rs

@@ -1,12 +1,6 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// SPDX-FileCopyrightText: The Rust Project Developers (see https://thanks.rust-lang.org)
+
 #![no_std]
 #![feature(allocator_api, rustc_private)]
 #![cfg_attr(any(unix, target_os = "redox"), feature(libc))]
@@ -21,6 +15,7 @@
 const MIN_ALIGN: usize = 8;
 #[cfg(any(target_arch = "x86_64",
               target_arch = "aarch64",
+              target_arch = "loongarch64",
               target_arch = "mips64",
               target_arch = "s390x",
               target_arch = "sparc64"))]

example/mini_core.rs

@@ -451,6 +451,9 @@ pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
     drop_in_place(to_drop);
 }
 
+#[lang = "unpin"]
+pub auto trait Unpin {}
+
 #[lang = "deref"]
 pub trait Deref {
     type Target: ?Sized;
@@ -488,9 +491,23 @@ pub struct Box<T: ?Sized, A: Allocator = Global>(Unique<T>, A);
 
 impl<T: ?Sized + Unsize<U>, U: ?Sized, A: Allocator> CoerceUnsized<Box<U, A>> for Box<T, A> {}
 
+impl<T> Box<T> {
+    pub fn new(val: T) -> Box<T> {
+        unsafe {
+            let size = intrinsics::size_of::<T>();
+            let ptr = libc::malloc(size);
+            intrinsics::copy(&val as *const T as *const u8, ptr, size);
+            Box(Unique { pointer: NonNull(ptr as *const T), _marker: PhantomData }, Global)
+        }
+    }
+}
+
 impl<T: ?Sized, A: Allocator> Drop for Box<T, A> {
     fn drop(&mut self) {
-        // drop is currently performed by compiler.
+        // inner value is dropped by compiler.
+        unsafe {
+            libc::free(self.0.pointer.0 as *mut u8);
+        }
     }
 }
 
@@ -507,11 +524,6 @@ unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
     libc::malloc(size)
 }
 
-#[lang = "box_free"]
-unsafe fn box_free<T: ?Sized>(ptr: Unique<T>, _alloc: ()) {
-    libc::free(ptr.pointer.0 as *mut u8);
-}
-
 #[lang = "drop"]
 pub trait Drop {
     fn drop(&mut self);

example/mini_core_hello_world.rs

@@ -1,7 +1,7 @@
 // Adapted from https://github.com/sunfishcode/mir2cranelift/blob/master/rust-examples/nocore-hello-world.rs
 
 #![feature(
-    no_core, unboxed_closures, start, lang_items, box_syntax, never_type, linkage,
+    no_core, unboxed_closures, start, lang_items, never_type, linkage,
     extern_types, thread_local
 )]
 #![no_core]
@@ -163,7 +163,7 @@ fn main() {
         let ptr: *const u8 = hello as *const [u8] as *const u8;
         puts(ptr);
 
-        let world: Box<&str> = box "World!\0";
+        let world: Box<&str> = Box::new("World!\0");
         puts(*world as *const str as *const u8);
         world as Box<dyn SomeTrait>;
 
@@ -226,10 +226,10 @@ fn main() {
         }
     }
 
-    let _ = box NoisyDrop {
+    let _ = Box::new(NoisyDrop {
         text: "Boxed outer got dropped!\0",
         inner: NoisyDropInner,
-    } as Box<dyn SomeTrait>;
+    }) as Box<dyn SomeTrait>;
 
     const FUNC_REF: Option<fn()> = Some(main);
     #[allow(unreachable_code)]

example/mod_bench.rs

@@ -1,4 +1,4 @@
-#![feature(start, box_syntax, core_intrinsics, lang_items)]
+#![feature(start, core_intrinsics, lang_items)]
 #![no_std]
 
 #[link(name = "c")]

failing-ui-tests.txt

@@ -54,8 +54,8 @@ tests/ui/issues/issue-40883.rs
 tests/ui/issues/issue-43853.rs
 tests/ui/issues/issue-47364.rs
 tests/ui/macros/rfc-2011-nicer-assert-messages/assert-without-captures-does-not-create-unnecessary-code.rs
-tests/ui/rfc-2091-track-caller/std-panic-locations.rs
-tests/ui/rfcs/rfc1857-drop-order.rs
+tests/ui/rfcs/rfc-2091-track-caller/std-panic-locations.rs
+tests/ui/rfcs/rfc-1857-stabilize-drop-order/drop-order.rs
 tests/ui/simd/issue-17170.rs
 tests/ui/simd/issue-39720.rs
 tests/ui/simd/issue-89193.rs
@@ -66,3 +66,5 @@ tests/ui/generator/panic-safe.rs
 tests/ui/issues/issue-14875.rs
 tests/ui/issues/issue-29948.rs
 tests/ui/panic-while-printing.rs
+tests/ui/enum-discriminant/get_discr.rs
+tests/ui/panics/nested_panic_caught.rs