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% Lang items
> **Note**: lang items are often provided by crates in the Rust distribution,
> and lang items themselves have an unstable interface. It is recommended to use
> officially distributed crates instead of defining your own lang items.
The `rustc` compiler has certain pluggable operations, that is,
functionality that isn't hard-coded into the language, but is
implemented in libraries, with a special marker to tell the compiler
it exists. The marker is the attribute `#[lang = "..."]` and there are
various different values of `...`, i.e. various different 'lang
items'.
For example, `Box` pointers require two lang items, one for allocation
and one for deallocation. A freestanding program that uses the `Box`
sugar for dynamic allocations via `malloc` and `free`:
```rust
#![feature(lang_items, box_syntax, start, no_std, libc)]
#![no_std]
extern crate libc;
extern {
fn abort() -> !;
}
#[lang = "owned_box"]
pub struct Box<T>(*mut T);
#[lang = "exchange_malloc"]
unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
let p = libc::malloc(size as libc::size_t) as *mut u8;
// malloc failed
if p as usize == 0 {
abort();
}
p
}
#[lang = "exchange_free"]
unsafe fn deallocate(ptr: *mut u8, _size: usize, _align: usize) {
libc::free(ptr as *mut libc::c_void)
}
#[start]
fn main(argc: isize, argv: *const *const u8) -> isize {
let x = box 1;
0
}
#[lang = "stack_exhausted"] extern fn stack_exhausted() {}
#[lang = "eh_personality"] extern fn eh_personality() {}
#[lang = "panic_fmt"] fn panic_fmt() -> ! { loop {} }
```
Note the use of `abort`: the `exchange_malloc` lang item is assumed to
return a valid pointer, and so needs to do the check internally.
Other features provided by lang items include:
- overloadable operators via traits: the traits corresponding to the
`==`, `<`, dereferencing (`*`) and `+` (etc.) operators are all
marked with lang items; those specific four are `eq`, `ord`,
`deref`, and `add` respectively.
- stack unwinding and general failure; the `eh_personality`, `fail`
and `fail_bounds_checks` lang items.
- the traits in `std::marker` used to indicate types of
various kinds; lang items `send`, `sync` and `copy`.
- the marker types and variance indicators found in
`std::marker`; lang items `covariant_type`,
`contravariant_lifetime`, etc.
Lang items are loaded lazily by the compiler; e.g. if one never uses
`Box` then there is no need to define functions for `exchange_malloc`
and `exchange_free`. `rustc` will emit an error when an item is needed
but not found in the current crate or any that it depends on.
|
