Merge commit '08a6d6e16b' into sync-cg_gcc-2023-03-04

compiler/rustc_codegen_gcc/example/alloc_example.rs

@@ -1,4 +1,4 @@
-#![feature(start, box_syntax, core_intrinsics, alloc_error_handler)]
+#![feature(start, box_syntax, core_intrinsics, alloc_error_handler, lang_items)]
 #![no_std]
 
 extern crate alloc;
@@ -18,16 +18,22 @@ extern "C" {
 
 #[panic_handler]
 fn panic_handler(_: &core::panic::PanicInfo) -> ! {
-    unsafe {
-        core::intrinsics::abort();
-    }
+    core::intrinsics::abort();
 }
 
 #[alloc_error_handler]
 fn alloc_error_handler(_: alloc::alloc::Layout) -> ! {
-    unsafe {
-        core::intrinsics::abort();
-    }
+    core::intrinsics::abort();
+}
+
+#[lang = "eh_personality"]
+fn eh_personality() -> ! {
+    loop {}
+}
+
+#[no_mangle]
+unsafe extern "C" fn _Unwind_Resume() {
+    core::intrinsics::unreachable();
 }
 
 #[start]

compiler/rustc_codegen_gcc/example/mini_core.rs

@@ -1,6 +1,6 @@
 #![feature(
     no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types,
-    untagged_unions, decl_macro, rustc_attrs, transparent_unions, auto_traits,
+    decl_macro, rustc_attrs, transparent_unions, auto_traits,
     thread_local
 )]
 #![no_core]
@@ -17,6 +17,9 @@ pub trait Sized {}
 #[lang = "destruct"]
 pub trait Destruct {}
 
+#[lang = "tuple_trait"]
+pub trait Tuple {}
+
 #[lang = "unsize"]
 pub trait Unsize<T: ?Sized> {}
 
@@ -39,14 +42,14 @@ impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a mut U> for &'a mut
 impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*const U> for *const T {}
 // *mut T -> *mut U
 impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*mut U> for *mut T {}
-impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Box<U>> for Box<T> {}
+impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Box<U, ()>> for Box<T, ()> {}
 
 #[lang = "receiver"]
 pub trait Receiver {}
 
 impl<T: ?Sized> Receiver for &T {}
 impl<T: ?Sized> Receiver for &mut T {}
-impl<T: ?Sized> Receiver for Box<T> {}
+impl<T: ?Sized, A: Allocator> Receiver for Box<T, A> {}
 
 #[lang = "copy"]
 pub unsafe trait Copy {}
@@ -396,7 +399,7 @@ pub struct PhantomData<T: ?Sized>;
 
 #[lang = "fn_once"]
 #[rustc_paren_sugar]
-pub trait FnOnce<Args> {
+pub trait FnOnce<Args: Tuple> {
     #[lang = "fn_once_output"]
     type Output;
 
@@ -405,13 +408,21 @@ pub trait FnOnce<Args> {
 
 #[lang = "fn_mut"]
 #[rustc_paren_sugar]
-pub trait FnMut<Args>: FnOnce<Args> {
+pub trait FnMut<Args: Tuple>: FnOnce<Args> {
     extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output;
 }
 
 #[lang = "panic"]
 #[track_caller]
-pub fn panic(_msg: &str) -> ! {
+pub fn panic(_msg: &'static str) -> ! {
+    unsafe {
+        libc::puts("Panicking\n\0" as *const str as *const u8);
+        intrinsics::abort();
+    }
+}
+
+#[lang = "panic_cannot_unwind"]
+fn panic_cannot_unwind() -> ! {
     unsafe {
         libc::puts("Panicking\n\0" as *const str as *const u8);
         intrinsics::abort();
@@ -450,17 +461,32 @@ pub trait Deref {
 pub trait Allocator {
 }
 
+impl Allocator for () {}
+
 pub struct Global;
 
 impl Allocator for Global {}
 
-#[lang = "owned_box"]
-pub struct Box<
-    T: ?Sized,
-    A: Allocator = Global,
->(*mut T, A);
+#[repr(transparent)]
+#[rustc_layout_scalar_valid_range_start(1)]
+#[rustc_nonnull_optimization_guaranteed]
+pub struct NonNull<T: ?Sized>(pub *const T);
 
-impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Box<U>> for Box<T> {}
+impl<T: ?Sized, U: ?Sized> CoerceUnsized<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NonNull<U>> for NonNull<T> where T: Unsize<U> {}
+
+pub struct Unique<T: ?Sized> {
+    pub pointer: NonNull<T>,
+    pub _marker: PhantomData<T>,
+}
+
+impl<T: ?Sized, U: ?Sized> CoerceUnsized<Unique<U>> for Unique<T> where T: Unsize<U> {}
+impl<T: ?Sized, U: ?Sized> DispatchFromDyn<Unique<U>> for Unique<T> where T: Unsize<U> {}
+
+#[lang = "owned_box"]
+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: ?Sized, A: Allocator> Drop for Box<T, A> {
     fn drop(&mut self) {
@@ -468,7 +494,7 @@ impl<T: ?Sized, A: Allocator> Drop for Box<T, A> {
     }
 }
 
-impl<T> Deref for Box<T> {
+impl<T: ?Sized, A: Allocator> Deref for Box<T, A> {
     type Target = T;
 
     fn deref(&self) -> &Self::Target {
@@ -482,8 +508,8 @@ unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
 }
 
 #[lang = "box_free"]
-unsafe fn box_free<T: ?Sized, A: Allocator>(ptr: *mut T, alloc: A) {
-    libc::free(ptr as *mut u8);
+unsafe fn box_free<T: ?Sized>(ptr: Unique<T>, _alloc: ()) {
+    libc::free(ptr.pointer.0 as *mut u8);
 }
 
 #[lang = "drop"]
@@ -505,17 +531,25 @@ pub union MaybeUninit<T> {
 }
 
 pub mod intrinsics {
+    use crate::Sized;
+
     extern "rust-intrinsic" {
+        #[rustc_safe_intrinsic]
         pub fn abort() -> !;
+        #[rustc_safe_intrinsic]
         pub fn size_of<T>() -> usize;
-        pub fn size_of_val<T: ?::Sized>(val: *const T) -> usize;
+        pub fn size_of_val<T: ?Sized>(val: *const T) -> usize;
+        #[rustc_safe_intrinsic]
         pub fn min_align_of<T>() -> usize;
-        pub fn min_align_of_val<T: ?::Sized>(val: *const T) -> usize;
+        pub fn min_align_of_val<T: ?Sized>(val: *const T) -> usize;
         pub fn copy<T>(src: *const T, dst: *mut T, count: usize);
         pub fn transmute<T, U>(e: T) -> U;
         pub fn ctlz_nonzero<T>(x: T) -> T;
-        pub fn needs_drop<T: ?::Sized>() -> bool;
+        #[rustc_safe_intrinsic]
+        pub fn needs_drop<T: ?Sized>() -> bool;
+        #[rustc_safe_intrinsic]
         pub fn bitreverse<T>(x: T) -> T;
+        #[rustc_safe_intrinsic]
         pub fn bswap<T>(x: T) -> T;
         pub fn write_bytes<T>(dst: *mut T, val: u8, count: usize);
         pub fn unreachable() -> !;

compiler/rustc_codegen_gcc/example/mini_core_hello_world.rs

@@ -85,6 +85,7 @@ fn start<T: Termination + 'static>(
     main: fn() -> T,
     argc: isize,
     argv: *const *const u8,
+    _sigpipe: u8,
 ) -> isize {
     if argc == 3 {
         unsafe { puts(*argv); }
@@ -228,6 +229,7 @@ fn main() {
     } as Box<dyn SomeTrait>;
 
     const FUNC_REF: Option<fn()> = Some(main);
+    #[allow(unreachable_code)]
     match FUNC_REF {
         Some(_) => {},
         None => assert!(false),

compiler/rustc_codegen_gcc/example/mod_bench.rs

@@ -6,9 +6,7 @@ extern {}
 
 #[panic_handler]
 fn panic_handler(_: &core::panic::PanicInfo) -> ! {
-    unsafe {
-        core::intrinsics::abort();
-    }
+    core::intrinsics::abort();
 }
 
 #[lang="eh_personality"]
@@ -32,6 +30,6 @@ fn main(_argc: isize, _argv: *const *const u8) -> isize {
 #[inline(never)]
 fn black_box(i: u32) {
     if i != 1 {
-        unsafe { core::intrinsics::abort(); }
+        core::intrinsics::abort();
     }
 }

compiler/rustc_codegen_gcc/example/std_example.rs

@@ -1,5 +1,6 @@
 #![feature(core_intrinsics, generators, generator_trait, is_sorted)]
 
+#[cfg(feature="master")]
 use std::arch::x86_64::*;
 use std::io::Write;
 use std::ops::Generator;