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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 container::MutableSet;
use hashmap::HashSet;
use iter::Iterator;
use option::{Some, None, Option};
use ptr::RawPtr;
use vec::ImmutableVector;
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 ModEntry<'a> {
name: &'a str,
log_level: *mut u32
}
pub struct CrateMap<'a> {
version: i32,
entries: &'a [ModEntry<'a>],
children: &'a [&'a CrateMap<'a>],
event_loop_factory: Option<fn() -> ~EventLoop>,
}
#[cfg(not(windows))]
pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
extern {
#[crate_map]
static CRATE_MAP: CrateMap<'static>;
}
let ptr: (*CrateMap) = &'static CRATE_MAP;
if ptr.is_null() {
return None;
} else {
return Some(&'static CRATE_MAP);
}
}
#[cfg(windows)]
pub fn get_crate_map() -> Option<&'static CrateMap<'static>> {
use cast::transmute;
use c_str::ToCStr;
use unstable::dynamic_lib::dl;
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(transmute(sym));
}
}
}
fn version(crate_map: &CrateMap) -> i32 {
match crate_map.version {
2 => return 2,
_ => return 0
}
}
fn do_iter_crate_map<'a>(
crate_map: &'a CrateMap<'a>,
f: |&ModEntry|,
visited: &mut HashSet<*CrateMap<'a>>) {
if visited.insert(crate_map as *CrateMap) {
match version(crate_map) {
2 => {
let (entries, children) = (crate_map.entries, crate_map.children);
for entry in entries.iter() {
f(entry);
}
for child in children.iter() {
do_iter_crate_map(*child, |x| f(x), visited);
}
},
_ => fail!("invalid crate map version")
}
}
}
/// Iterates recursively over `crate_map` and all child crate maps
pub fn iter_crate_map<'a>(crate_map: &'a CrateMap<'a>, f: |&ModEntry|) {
// FIXME: use random numbers as keys from the OS-level RNG when there is a nice
// way to do this
let mut v: HashSet<*CrateMap<'a>> = HashSet::with_capacity_and_keys(0, 0, 32);
do_iter_crate_map(crate_map, f, &mut v);
}
#[cfg(test)]
mod tests {
use option::None;
use rt::crate_map::{CrateMap, ModEntry, iter_crate_map};
#[test]
fn iter_crate_map_duplicates() {
let mut level3: u32 = 3;
let entries = [
ModEntry { name: "c::m1", log_level: &mut level3},
];
let child_crate = CrateMap {
version: 2,
entries: entries,
children: &[],
event_loop_factory: None,
};
let root_crate = CrateMap {
version: 2,
entries: &[],
children: &[&child_crate, &child_crate],
event_loop_factory: None,
};
let mut cnt = 0;
unsafe {
iter_crate_map(&root_crate, |entry| {
assert!(*entry.log_level == 3);
cnt += 1;
});
assert!(cnt == 1);
}
}
#[test]
fn iter_crate_map_follow_children() {
let mut level2: u32 = 2;
let mut level3: u32 = 3;
let child_crate2 = CrateMap {
version: 2,
entries: &[
ModEntry { name: "c::m1", log_level: &mut level2},
ModEntry { name: "c::m2", log_level: &mut level3},
],
children: &[],
event_loop_factory: None,
};
let child_crate1 = CrateMap {
version: 2,
entries: &[
ModEntry { name: "t::f1", log_level: &mut 1},
],
children: &[&child_crate2],
event_loop_factory: None,
};
let root_crate = CrateMap {
version: 2,
entries: &[
ModEntry { name: "t::f2", log_level: &mut 0},
],
children: &[&child_crate1],
event_loop_factory: None,
};
let mut cnt = 0;
unsafe {
iter_crate_map(&root_crate, |entry| {
assert!(*entry.log_level == cnt);
cnt += 1;
});
assert!(cnt == 4);
}
}
}
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