mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-30 17:34:54 +00:00
98 lines
3.4 KiB
Rust
98 lines
3.4 KiB
Rust
// rsbegin.o and rsend.o are the so called "compiler runtime startup objects".
|
|
// They contain code needed to correctly initialize the compiler runtime.
|
|
//
|
|
// When an executable or dylib image is linked, all user code and libraries are
|
|
// "sandwiched" between these two object files, so code or data from rsbegin.o
|
|
// become first in the respective sections of the image, whereas code and data
|
|
// from rsend.o become the last ones. This effect can be used to place symbols
|
|
// at the beginning or at the end of a section, as well as to insert any required
|
|
// headers or footers.
|
|
//
|
|
// Note that the actual module entry point is located in the C runtime startup
|
|
// object (usually called `crtX.o`), which then invokes initialization callbacks
|
|
// of other runtime components (registered via yet another special image section).
|
|
|
|
#![feature(no_core)]
|
|
#![feature(lang_items)]
|
|
#![feature(auto_traits)]
|
|
#![crate_type = "rlib"]
|
|
#![no_core]
|
|
#![allow(non_camel_case_types)]
|
|
|
|
#[lang = "sized"]
|
|
trait Sized {}
|
|
#[lang = "sync"]
|
|
auto trait Sync {}
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
#[lang = "freeze"]
|
|
auto trait Freeze {}
|
|
|
|
#[lang = "drop_in_place"]
|
|
#[inline]
|
|
#[allow(unconditional_recursion)]
|
|
pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
|
|
drop_in_place(to_drop);
|
|
}
|
|
|
|
#[cfg(all(target_os = "windows", target_arch = "x86", target_env = "gnu"))]
|
|
pub mod eh_frames {
|
|
#[no_mangle]
|
|
#[link_section = ".eh_frame"]
|
|
// Marks beginning of the stack frame unwind info section
|
|
pub static __EH_FRAME_BEGIN__: [u8; 0] = [];
|
|
|
|
// Scratch space for unwinder's internal book-keeping.
|
|
// This is defined as `struct object` in $GCC/libgcc/unwind-dw2-fde.h.
|
|
static mut OBJ: [isize; 6] = [0; 6];
|
|
|
|
macro_rules! impl_copy {
|
|
($($t:ty)*) => {
|
|
$(
|
|
impl ::Copy for $t {}
|
|
)*
|
|
}
|
|
}
|
|
|
|
impl_copy! {
|
|
usize u8 u16 u32 u64 u128
|
|
isize i8 i16 i32 i64 i128
|
|
f32 f64
|
|
bool char
|
|
}
|
|
|
|
// Unwind info registration/deregistration routines.
|
|
// See the docs of libpanic_unwind.
|
|
extern "C" {
|
|
fn rust_eh_register_frames(eh_frame_begin: *const u8, object: *mut u8);
|
|
fn rust_eh_unregister_frames(eh_frame_begin: *const u8, object: *mut u8);
|
|
}
|
|
|
|
unsafe extern "C" fn init() {
|
|
// register unwind info on module startup
|
|
rust_eh_register_frames(&__EH_FRAME_BEGIN__ as *const u8, &mut OBJ as *mut _ as *mut u8);
|
|
}
|
|
|
|
unsafe extern "C" fn uninit() {
|
|
// unregister on shutdown
|
|
rust_eh_unregister_frames(&__EH_FRAME_BEGIN__ as *const u8, &mut OBJ as *mut _ as *mut u8);
|
|
}
|
|
|
|
// MinGW-specific init/uninit routine registration
|
|
pub mod mingw_init {
|
|
// MinGW's startup objects (crt0.o / dllcrt0.o) will invoke global constructors in the
|
|
// .ctors and .dtors sections on startup and exit. In the case of DLLs, this is done when
|
|
// the DLL is loaded and unloaded.
|
|
//
|
|
// The linker will sort the sections, which ensures that our callbacks are located at the
|
|
// end of the list. Since constructors are run in reverse order, this ensures that our
|
|
// callbacks are the first and last ones executed.
|
|
|
|
#[link_section = ".ctors.65535"] // .ctors.* : C initialization callbacks
|
|
pub static P_INIT: unsafe extern "C" fn() = super::init;
|
|
|
|
#[link_section = ".dtors.65535"] // .dtors.* : C termination callbacks
|
|
pub static P_UNINIT: unsafe extern "C" fn() = super::uninit;
|
|
}
|
|
}
|