Nightly stuff

This commit is contained in:
Matthias Schiffer 2020-05-01 18:46:23 +02:00
parent 5b449f4e1e
commit fd2384b7fa
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
9 changed files with 73 additions and 232 deletions

View file

@ -1,8 +1,12 @@
#![no_main]
#![no_std]
#![feature(alloc_error_handler)]
use safe_libc as libc;
mod system_alloc;
extern crate alloc;
use libc::cstr;
use safe_libc as libc;
use core::fmt::Write;
@ -19,17 +23,20 @@ pub extern "C" fn main(_nargs: libc::c_int, _args: *const *const libc::c_char) -
let x = libc::string::CString::from("foo");
let l = x.len();
let y = x.into_raw();
let z = unsafe {
libc::boxed::CBox::slice_from_raw_parts(y, l)
};
let z = unsafe { alloc::boxed::Box::from_raw(core::ptr::slice_from_raw_parts_mut(y, l)) };
let _ = writeln!(stdout, "Foo: {} {} {}", z[0], z[1], z[2]);
}
{
let b = libc::boxed::CBox::new(42);
let b = alloc::boxed::Box::new(42);
let _ = writeln!(stdout, "Bar: {}", b);
}
{
let x = alloc::boxed::Box::new(());
let _ = writeln!(stdout, "Box: {:?}", x);
}
0
}

21
src/system_alloc.rs Normal file
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@ -0,0 +1,21 @@
use safe_libc as libc;
struct System;
unsafe impl alloc::alloc::GlobalAlloc for System {
unsafe fn alloc(&self, layout: alloc::alloc::Layout) -> *mut u8 {
libc::memalign(layout.align(), layout.size()).cast()
}
unsafe fn dealloc(&self, ptr: *mut u8, _layout: alloc::alloc::Layout) {
libc::free(ptr.cast());
}
}
#[global_allocator]
static SYSTEM_ALLOC: System = System;
#[alloc_error_handler]
fn alloc_error(_: core::alloc::Layout) -> ! {
panic!("allocation failure");
}