parent
5637ed7566
commit
675475c4d3
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@ -51,6 +51,11 @@ pub extern fn __rust_allocate(size: usize, _align: usize) -> *mut u8 {
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unsafe { libc::malloc(size as libc::size_t) as *mut u8 }
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}
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#[no_mangle]
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pub extern fn __rust_allocate_zeroed(size: usize, _align: usize) -> *mut u8 {
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unsafe { libc::calloc(size as libc::size_t, 1) as *mut u8 }
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}
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#[no_mangle]
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pub extern fn __rust_deallocate(ptr: *mut u8, _old_size: usize, _align: usize) {
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unsafe { libc::free(ptr as *mut libc::c_void) }
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@ -23,6 +23,7 @@ use core::intrinsics::{min_align_of_val, size_of_val};
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extern "C" {
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#[allocator]
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fn __rust_allocate(size: usize, align: usize) -> *mut u8;
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fn __rust_allocate_zeroed(size: usize, align: usize) -> *mut u8;
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fn __rust_deallocate(ptr: *mut u8, old_size: usize, align: usize);
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fn __rust_reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8;
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fn __rust_reallocate_inplace(ptr: *mut u8,
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@ -59,6 +60,20 @@ pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
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__rust_allocate(size, align)
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}
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/// Return a pointer to `size` bytes of memory aligned to `align` and
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/// initialized to zeroes.
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///
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/// On failure, return a null pointer.
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///
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/// Behavior is undefined if the requested size is 0 or the alignment is not a
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/// power of 2. The alignment must be no larger than the largest supported page
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/// size on the platform.
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#[inline]
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pub unsafe fn allocate_zeroed(size: usize, align: usize) -> *mut u8 {
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check_size_and_alignment(size, align);
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__rust_allocate_zeroed(size, align)
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}
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/// Resize the allocation referenced by `ptr` to `size` bytes.
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///
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/// On failure, return a null pointer and leave the original allocation intact.
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@ -162,6 +177,25 @@ mod tests {
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use boxed::Box;
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use heap;
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#[test]
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fn allocate_zeroed() {
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unsafe {
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let size = 1024;
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let ptr = heap::allocate_zeroed(size, 1);
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if ptr.is_null() {
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::oom()
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}
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let end = ptr.offset(size as isize);
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let mut i = ptr;
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while i < end {
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assert_eq!(*i, 0);
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i = i.offset(1);
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}
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heap::deallocate(ptr, size, 1);
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}
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}
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#[test]
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fn basic_reallocate_inplace_noop() {
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unsafe {
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@ -81,7 +81,18 @@ impl<T> RawVec<T> {
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/// # Aborts
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///
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/// Aborts on OOM
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#[inline]
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pub fn with_capacity(cap: usize) -> Self {
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RawVec::allocate(cap, false)
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}
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/// Like `with_capacity` but guarantees the buffer is zeroed.
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#[inline]
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pub fn with_capacity_zeroed(cap: usize) -> Self {
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RawVec::allocate(cap, true)
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}
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fn allocate(cap: usize, zeroed: bool) -> Self {
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unsafe {
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let elem_size = mem::size_of::<T>();
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@ -93,7 +104,11 @@ impl<T> RawVec<T> {
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heap::EMPTY as *mut u8
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} else {
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let align = mem::align_of::<T>();
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let ptr = heap::allocate(alloc_size, align);
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let ptr = if zeroed {
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heap::allocate_zeroed(alloc_size, align)
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} else {
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heap::allocate(alloc_size, align)
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};
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if ptr.is_null() {
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oom()
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}
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@ -38,6 +38,10 @@ mod imp {
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target_os = "dragonfly", target_os = "windows", target_env = "musl"),
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link_name = "je_mallocx")]
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fn mallocx(size: size_t, flags: c_int) -> *mut c_void;
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#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
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target_os = "dragonfly", target_os = "windows", target_env = "musl"),
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link_name = "je_calloc")]
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fn calloc(size: size_t, flags: c_int) -> *mut c_void;
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#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
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target_os = "dragonfly", target_os = "windows", target_env = "musl"),
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link_name = "je_rallocx")]
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@ -56,6 +60,8 @@ mod imp {
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fn nallocx(size: size_t, flags: c_int) -> size_t;
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}
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const MALLOCX_ZERO: c_int = 0x40;
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// The minimum alignment guaranteed by the architecture. This value is used to
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// add fast paths for low alignment values. In practice, the alignment is a
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// constant at the call site and the branch will be optimized out.
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@ -91,6 +97,16 @@ mod imp {
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unsafe { mallocx(size as size_t, flags) as *mut u8 }
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}
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#[no_mangle]
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pub extern "C" fn __rust_allocate_zeroed(size: usize, align: usize) -> *mut u8 {
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if align <= MIN_ALIGN {
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unsafe { calloc(size as size_t, 1) as *mut u8 }
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} else {
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let flags = align_to_flags(align) | MALLOCX_ZERO;
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unsafe { mallocx(size as size_t, flags) as *mut u8 }
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}
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}
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#[no_mangle]
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pub extern "C" fn __rust_reallocate(ptr: *mut u8,
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_old_size: usize,
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@ -135,6 +151,11 @@ mod imp {
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bogus()
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}
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#[no_mangle]
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pub extern "C" fn __rust_allocate_zeroed(_size: usize, _align: usize) -> *mut u8 {
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bogus()
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}
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#[no_mangle]
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pub extern "C" fn __rust_reallocate(_ptr: *mut u8,
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_old_size: usize,
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@ -44,6 +44,11 @@ pub extern "C" fn __rust_allocate(size: usize, align: usize) -> *mut u8 {
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unsafe { imp::allocate(size, align) }
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}
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#[no_mangle]
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pub extern "C" fn __rust_allocate_zeroed(size: usize, align: usize) -> *mut u8 {
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unsafe { imp::allocate_zeroed(size, align) }
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}
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#[no_mangle]
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pub extern "C" fn __rust_deallocate(ptr: *mut u8, old_size: usize, align: usize) {
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unsafe { imp::deallocate(ptr, old_size, align) }
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@ -121,6 +126,18 @@ mod imp {
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}
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}
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pub unsafe fn allocate_zeroed(size: usize, align: usize) -> *mut u8 {
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if align <= MIN_ALIGN {
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libc::calloc(size as libc::size_t, 1) as *mut u8
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} else {
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let ptr = aligned_malloc(size, align);
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if !ptr.is_null() {
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ptr::write_bytes(ptr, 0, size);
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}
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ptr
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}
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}
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pub unsafe fn reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8 {
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if align <= MIN_ALIGN {
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libc::realloc(ptr as *mut libc::c_void, size as libc::size_t) as *mut u8
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@ -173,6 +190,8 @@ mod imp {
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#[repr(C)]
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struct Header(*mut u8);
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const HEAP_ZERO_MEMORY: DWORD = 0x00000008;
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const HEAP_REALLOC_IN_PLACE_ONLY: DWORD = 0x00000010;
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unsafe fn get_header<'a>(ptr: *mut u8) -> &'a mut Header {
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@ -185,11 +204,12 @@ mod imp {
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aligned
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}
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pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
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#[inline]
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unsafe fn allocate_with_flags(size: usize, align: usize, flags: DWORD) -> *mut u8 {
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if align <= MIN_ALIGN {
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HeapAlloc(GetProcessHeap(), 0, size as SIZE_T) as *mut u8
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HeapAlloc(GetProcessHeap(), flags, size as SIZE_T) as *mut u8
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} else {
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let ptr = HeapAlloc(GetProcessHeap(), 0, (size + align) as SIZE_T) as *mut u8;
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let ptr = HeapAlloc(GetProcessHeap(), flags, (size + align) as SIZE_T) as *mut u8;
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if ptr.is_null() {
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return ptr;
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}
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}
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}
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pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
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allocate_with_flags(size, align, 0)
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}
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pub unsafe fn allocate_zeroed(size: usize, align: usize) -> *mut u8 {
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allocate_with_flags(size, align, HEAP_ZERO_MEMORY)
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}
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pub unsafe fn reallocate(ptr: *mut u8, _old_size: usize, size: usize, align: usize) -> *mut u8 {
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if align <= MIN_ALIGN {
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HeapReAlloc(GetProcessHeap(), 0, ptr as LPVOID, size as SIZE_T) as *mut u8
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@ -1370,9 +1370,38 @@ impl<T: PartialEq> Vec<T> {
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#[doc(hidden)]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn from_elem<T: Clone>(elem: T, n: usize) -> Vec<T> {
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let mut v = Vec::with_capacity(n);
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v.extend_with_element(n, elem);
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v
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<T as SpecFromElem>::from_elem(elem, n)
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}
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// Specialization trait used for Vec::from_elem
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trait SpecFromElem: Sized {
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fn from_elem(elem: Self, n: usize) -> Vec<Self>;
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}
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impl<T: Clone> SpecFromElem for T {
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default fn from_elem(elem: Self, n: usize) -> Vec<Self> {
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let mut v = Vec::with_capacity(n);
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v.extend_with_element(n, elem);
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v
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}
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}
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impl SpecFromElem for u8 {
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#[inline]
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fn from_elem(elem: u8, n: usize) -> Vec<u8> {
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if elem == 0 {
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return Vec {
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buf: RawVec::with_capacity_zeroed(n),
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len: n,
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}
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}
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unsafe {
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let mut v = Vec::with_capacity(n);
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ptr::write_bytes(v.as_mut_ptr(), elem, n);
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v.set_len(n);
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v
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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@ -27,6 +27,11 @@ pub extern fn __rust_allocate(size: usize, align: usize) -> *mut u8 {
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}
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}
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#[no_mangle]
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pub extern fn __rust_allocate_zeroed(size: usize, _align: usize) -> *mut u8 {
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unsafe { libc::calloc(size as libc::size_t, 1) as *mut u8 }
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}
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#[no_mangle]
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pub extern fn __rust_deallocate(ptr: *mut u8, old_size: usize, align: usize) {
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unsafe {
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