Auto merge of rust-lang#128134 - joboet:move_pal_alloc, r=cupiver

std: move allocators to `sys`

Part of rust-lang#117276.

Author: bors

library/std/src/sys/pal/hermit/alloc.rs renamed to library/std/src/sys/alloc/hermit.rs

@@ -1,4 +1,3 @@
-use super::hermit_abi;
 use crate::alloc::{GlobalAlloc, Layout, System};
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]

library/std/src/sys/pal/common/alloc.rs renamed to library/std/src/sys/alloc/mod.rs

@@ -1,10 +1,18 @@
 #![forbid(unsafe_op_in_unsafe_fn)]
+
 use crate::alloc::{GlobalAlloc, Layout, System};
-use crate::{cmp, ptr};
+use crate::ptr;
 
 // The minimum alignment guaranteed by the architecture. This value is used to
 // add fast paths for low alignment values.
-#[cfg(any(
+#[allow(dead_code)]
+const MIN_ALIGN: usize = if cfg!(any(
+    all(target_arch = "riscv32", any(target_os = "espidf", target_os = "zkvm")),
+    all(target_arch = "xtensa", target_os = "espidf"),
+)) {
+    // The allocator on the esp-idf and zkvm platforms guarantees 4 byte alignment.
+    4
+} else if cfg!(any(
     target_arch = "x86",
     target_arch = "arm",
     target_arch = "m68k",
@@ -16,11 +24,11 @@ use crate::{cmp, ptr};
     target_arch = "sparc",
     target_arch = "wasm32",
     target_arch = "hexagon",
-    all(target_arch = "riscv32", not(any(target_os = "espidf", target_os = "zkvm"))),
-    all(target_arch = "xtensa", not(target_os = "espidf")),
-))]
-pub const MIN_ALIGN: usize = 8;
-#[cfg(any(
+    target_arch = "riscv32",
+    target_arch = "xtensa",
+)) {
+    8
+} else if cfg!(any(
     target_arch = "x86_64",
     target_arch = "aarch64",
     target_arch = "arm64ec",
@@ -31,16 +39,14 @@ pub const MIN_ALIGN: usize = 8;
     target_arch = "sparc64",
     target_arch = "riscv64",
     target_arch = "wasm64",
-))]
-pub const MIN_ALIGN: usize = 16;
-// The allocator on the esp-idf and zkvm platforms guarantee 4 byte alignment.
-#[cfg(all(any(
-    all(target_arch = "riscv32", any(target_os = "espidf", target_os = "zkvm")),
-    all(target_arch = "xtensa", target_os = "espidf"),
-)))]
-pub const MIN_ALIGN: usize = 4;
+)) {
+    16
+} else {
+    panic!("add a value for MIN_ALIGN")
+};
 
-pub unsafe fn realloc_fallback(
+#[allow(dead_code)]
+unsafe fn realloc_fallback(
     alloc: &System,
     ptr: *mut u8,
     old_layout: Layout,
@@ -52,10 +58,37 @@ pub unsafe fn realloc_fallback(
 
         let new_ptr = GlobalAlloc::alloc(alloc, new_layout);
         if !new_ptr.is_null() {
-            let size = cmp::min(old_layout.size(), new_size);
+            let size = usize::min(old_layout.size(), new_size);
             ptr::copy_nonoverlapping(ptr, new_ptr, size);
             GlobalAlloc::dealloc(alloc, ptr, old_layout);
         }
+
         new_ptr
     }
 }
+
+cfg_if::cfg_if! {
+    if #[cfg(any(
+        target_family = "unix",
+        target_os = "wasi",
+        target_os = "teeos",
+    ))] {
+        mod unix;
+    } else if #[cfg(target_os = "windows")] {
+        mod windows;
+    } else if #[cfg(target_os = "hermit")] {
+        mod hermit;
+    } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] {
+        mod sgx;
+    } else if #[cfg(target_os = "solid_asp3")] {
+        mod solid;
+    } else if #[cfg(target_os = "uefi")] {
+        mod uefi;
+    } else if #[cfg(target_family = "wasm")] {
+        mod wasm;
+    } else if #[cfg(target_os = "xous")] {
+        mod xous;
+    } else if #[cfg(target_os = "zkvm")] {
+        mod zkvm;
+    }
+}

library/std/src/sys/pal/sgx/alloc.rs renamed to library/std/src/sys/alloc/sgx.rs

@@ -1,9 +1,8 @@
-use core::sync::atomic::{AtomicBool, Ordering};
-
-use super::abi::mem as sgx_mem;
-use super::waitqueue::SpinMutex;
 use crate::alloc::{GlobalAlloc, Layout, System};
 use crate::ptr;
+use crate::sync::atomic::{AtomicBool, Ordering};
+use crate::sys::pal::abi::mem as sgx_mem;
+use crate::sys::pal::waitqueue::SpinMutex;
 
 // Using a SpinMutex because we never want to exit the enclave waiting for the
 // allocator.

library/std/src/sys/pal/solid/alloc.rs renamed to library/std/src/sys/alloc/solid.rs

@@ -1,5 +1,5 @@
+use super::{realloc_fallback, MIN_ALIGN};
 use crate::alloc::{GlobalAlloc, Layout, System};
-use crate::sys::common::alloc::{realloc_fallback, MIN_ALIGN};
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {

library/std/src/sys/pal/uefi/alloc.rs renamed to library/std/src/sys/alloc/uefi.rs

@@ -3,9 +3,9 @@
 
 use r_efi::protocols::loaded_image;
 
-use super::helpers;
 use crate::alloc::{GlobalAlloc, Layout, System};
 use crate::sync::OnceLock;
+use crate::sys::pal::helpers;
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {

library/std/src/sys/pal/unix/alloc.rs renamed to library/std/src/sys/alloc/unix.rs

@@ -1,6 +1,6 @@
+use super::{realloc_fallback, MIN_ALIGN};
 use crate::alloc::{GlobalAlloc, Layout, System};
 use crate::ptr;
-use crate::sys::common::alloc::{realloc_fallback, MIN_ALIGN};
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {
@@ -11,7 +11,7 @@ unsafe impl GlobalAlloc for System {
         // Also see <https://github.com/rust-lang/rust/issues/45955> and
         // <https://github.com/rust-lang/rust/issues/62251#issuecomment-507580914>.
         if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-            libc::malloc(layout.size()) as *mut u8
+            unsafe { libc::malloc(layout.size()) as *mut u8 }
         } else {
             // `posix_memalign` returns a non-aligned value if supplied a very
             // large alignment on older versions of Apple's platforms (unknown
@@ -25,35 +25,35 @@ unsafe impl GlobalAlloc for System {
                     return ptr::null_mut();
                 }
             }
-            aligned_malloc(&layout)
+            unsafe { aligned_malloc(&layout) }
         }
     }
 
     #[inline]
     unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
         // See the comment above in `alloc` for why this check looks the way it does.
         if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-            libc::calloc(layout.size(), 1) as *mut u8
+            unsafe { libc::calloc(layout.size(), 1) as *mut u8 }
         } else {
-            let ptr = self.alloc(layout);
+            let ptr = unsafe { self.alloc(layout) };
             if !ptr.is_null() {
-                ptr::write_bytes(ptr, 0, layout.size());
+                unsafe { ptr::write_bytes(ptr, 0, layout.size()) };
             }
             ptr
         }
     }
 
     #[inline]
     unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
-        libc::free(ptr as *mut libc::c_void)
+        unsafe { libc::free(ptr as *mut libc::c_void) }
     }
 
     #[inline]
     unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
         if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
-            libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
+            unsafe { libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8 }
         } else {
-            realloc_fallback(self, ptr, layout, new_size)
+            unsafe { realloc_fallback(self, ptr, layout, new_size) }
         }
     }
 }
@@ -81,7 +81,7 @@ cfg_if::cfg_if! {
             // posix_memalign only has one, clear requirement: that the alignment be a multiple of
             // `sizeof(void*)`. Since these are all powers of 2, we can just use max.
             let align = layout.align().max(crate::mem::size_of::<usize>());
-            let ret = libc::posix_memalign(&mut out, align, layout.size());
+            let ret = unsafe { libc::posix_memalign(&mut out, align, layout.size()) };
             if ret != 0 { ptr::null_mut() } else { out as *mut u8 }
         }
     }

library/std/src/sys/pal/wasm/alloc.rs renamed to library/std/src/sys/alloc/wasm.rs

@@ -1,11 +1,10 @@
-use core::mem::MaybeUninit;
-
+use super::{realloc_fallback, MIN_ALIGN};
 use crate::alloc::{GlobalAlloc, Layout, System};
 use crate::ffi::c_void;
+use crate::mem::MaybeUninit;
 use crate::ptr;
 use crate::sync::atomic::{AtomicPtr, Ordering};
 use crate::sys::c;
-use crate::sys::common::alloc::{realloc_fallback, MIN_ALIGN};
 
 #[cfg(test)]
 mod tests;
@@ -113,28 +112,28 @@ fn init_or_get_process_heap() -> c::HANDLE {
 extern "C" fn process_heap_init_and_alloc(
     _heap: MaybeUninit<c::HANDLE>, // We pass this argument to match the ABI of `HeapAlloc`
     flags: u32,
-    dwBytes: usize,
+    bytes: usize,
 ) -> *mut c_void {
     let heap = init_or_get_process_heap();
     if core::intrinsics::unlikely(heap.is_null()) {
         return ptr::null_mut();
     }
     // SAFETY: `heap` is a non-null handle returned by `GetProcessHeap`.
-    unsafe { HeapAlloc(heap, flags, dwBytes) }
+    unsafe { HeapAlloc(heap, flags, bytes) }
 }
 
 #[inline(never)]
 fn process_heap_alloc(
     _heap: MaybeUninit<c::HANDLE>, // We pass this argument to match the ABI of `HeapAlloc`,
     flags: u32,
-    dwBytes: usize,
+    bytes: usize,
 ) -> *mut c_void {
     let heap = HEAP.load(Ordering::Relaxed);
     if core::intrinsics::likely(!heap.is_null()) {
         // SAFETY: `heap` is a non-null handle returned by `GetProcessHeap`.
-        unsafe { HeapAlloc(heap, flags, dwBytes) }
+        unsafe { HeapAlloc(heap, flags, bytes) }
     } else {
-        process_heap_init_and_alloc(MaybeUninit::uninit(), flags, dwBytes)
+        process_heap_init_and_alloc(MaybeUninit::uninit(), flags, bytes)
     }
 }