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// Copyright 2013 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.
use cast;
use option::{Some, None, Option};
use ptr::RawPtr;
use rt::rtio::EventLoop;
// Need to tell the linker on OS X to not barf on undefined symbols
// and instead look them up at runtime, which we need to resolve
// the crate_map properly.
#[cfg(target_os = "macos")]
#[link_args = "-Wl,-U,__rust_crate_map_toplevel"]
extern {}
pub struct CrateMap<'a> {
version: i32,
event_loop_factory: Option<fn() -> ~EventLoop>,
}
// When working on android, apparently weak symbols don't work so well for
// finding the crate map, and neither does dlopen + dlsym. This is mainly a
// problem when integrating a shared library with an existing application.
// Standalone binaries do not appear to have this problem. The reasons are a
// little mysterious, and more information can be found in #11731.
//
// For now we provide a way to tell libstd about the crate map manually that's
// checked before the normal weak symbol/dlopen paths. In theory this is useful
// on other platforms where our dlopen/weak linkage strategy mysteriously fails
// but the crate map can be specified manually.
static mut MANUALLY_PROVIDED_CRATE_MAP: *CrateMap<'static> =
0 as *CrateMap<'static>;
#[no_mangle]
#[cfg(not(test))]
pub extern fn rust_set_crate_map(map: *CrateMap<'static>) {
unsafe { MANUALLY_PROVIDED_CRATE_MAP = map; }
}
fn manual_crate_map() -> Option<&'static CrateMap<'static>> {
unsafe {
if MANUALLY_PROVIDED_CRATE_MAP.is_null() {
None
} else {
Some(cast::transmute(MANUALLY_PROVIDED_CRATE_MAP))
}
}
}
#[cfg(not(windows))]
pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
extern {
#[crate_map]
static CRATE_MAP: CrateMap<'static>;
}
manual_crate_map().or_else(|| {
let ptr: (*CrateMap) = &'static CRATE_MAP;
if ptr.is_null() {
None
} else {
Some(&'static CRATE_MAP)
}
})
}
#[cfg(windows)]
pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
use c_str::ToCStr;
use unstable::dynamic_lib::dl;
match manual_crate_map() {
Some(cm) => return Some(cm),
None => {}
}
let sym = unsafe {
let module = dl::open_internal();
let rust_crate_map_toplevel = if cfg!(target_arch = "x86") {
"__rust_crate_map_toplevel"
} else {
"_rust_crate_map_toplevel"
};
let sym = rust_crate_map_toplevel.with_c_str(|buf| {
dl::symbol(module, buf)
});
dl::close(module);
sym
};
let ptr: (*CrateMap) = sym as *CrateMap;
if ptr.is_null() {
return None;
} else {
unsafe {
return Some(cast::transmute(sym));
}
}
}
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