96 lines
3.8 KiB
Rust
96 lines
3.8 KiB
Rust
// Copyright 2015 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.
|
|
|
|
// 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, lang_items, optin_builtin_traits)]
|
|
#![crate_type="rlib"]
|
|
#![no_core]
|
|
#![allow(non_camel_case_types)]
|
|
|
|
#[lang = "sized"]
|
|
trait Sized {}
|
|
#[lang = "sync"]
|
|
trait Sync {}
|
|
impl Sync for .. {}
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
#[lang = "freeze"]
|
|
trait Freeze {}
|
|
impl Freeze for .. {}
|
|
|
|
#[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 $GCC/libgcc/unwind-dw2-fde.h.
|
|
static mut OBJ: [isize; 6] = [0; 6];
|
|
|
|
// Unwind info registration/deregistration routines.
|
|
// See the docs of `unwind` module in libstd.
|
|
extern "C" {
|
|
fn rust_eh_register_frames(eh_frame_begin: *const u8, object: *mut u8);
|
|
fn rust_eh_unregister_frames(eh_frame_begin: *const u8, object: *mut u8);
|
|
}
|
|
|
|
unsafe fn init() {
|
|
// register unwind info on module startup
|
|
rust_eh_register_frames(&__EH_FRAME_BEGIN__ as *const u8,
|
|
&mut OBJ as *mut _ as *mut u8);
|
|
}
|
|
|
|
unsafe fn uninit() {
|
|
// unregister on shutdown
|
|
rust_eh_unregister_frames(&__EH_FRAME_BEGIN__ as *const u8,
|
|
&mut OBJ as *mut _ as *mut u8);
|
|
}
|
|
|
|
// MSVC-specific init/uninit routine registration
|
|
pub mod ms_init {
|
|
// .CRT$X?? sections are roughly analogous to ELF's .init_array and .fini_array,
|
|
// except that they exploit the fact that linker will sort them alphabitically,
|
|
// so e.g. sections with names between .CRT$XIA and .CRT$XIZ are guaranteed to be
|
|
// placed between those two, without requiring any ordering of objects on the linker
|
|
// command line.
|
|
// Note that ordering of same-named sections from different objects is not guaranteed.
|
|
// Since .CRT$XIA contains init array's header symbol, which must always come first,
|
|
// we place our initialization callback into .CRT$XIB.
|
|
|
|
#[link_section = ".CRT$XIB"] // .CRT$XI? : C initialization callbacks
|
|
pub static P_INIT: unsafe fn() = super::init;
|
|
|
|
#[link_section = ".CRT$XTY"] // .CRT$XT? : C termination callbacks
|
|
pub static P_UNINIT: unsafe fn() = super::uninit;
|
|
}
|
|
}
|