     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50

    // Copyright 2018 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.

    #![allow(dead_code)]

    use alloc::{GlobalAlloc, Layout, System};
    use cmp;
    use ptr;

    // The minimum alignment guaranteed by the architecture. This value is used to
    // add fast paths for low alignment values.
    #[cfg(all(any(target_arch = "x86",
                  target_arch = "arm",
                  target_arch = "mips",
                  target_arch = "powerpc",
                  target_arch = "powerpc64",
                  target_arch = "asmjs",
                  target_arch = "wasm32")))]
    pub const MIN_ALIGN: usize = 8;
    #[cfg(all(any(target_arch = "x86_64",
                  target_arch = "aarch64",
                  target_arch = "mips64",
                  target_arch = "s390x",
                  target_arch = "sparc64")))]
    pub const MIN_ALIGN: usize = 16;

    pub unsafe fn realloc_fallback(
        alloc: &System,
        ptr: *mut u8,
        old_layout: Layout,
        new_size: usize,
    ) -> *mut u8 {
        // Docs for GlobalAlloc::realloc require this to be valid:
        let new_layout = Layout::from_size_align_unchecked(new_size, old_layout.align());

        let new_ptr = GlobalAlloc::alloc(alloc, new_layout);
        if !new_ptr.is_null() {
            let size = cmp::min(old_layout.size(), new_size);
            ptr::copy_nonoverlapping(ptr, new_ptr, size);
            GlobalAlloc::dealloc(alloc, ptr, old_layout);
        }
        new_ptr
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)