/
lang.rs
163 lines (139 loc) · 4.69 KB
/
lang.rs
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// Copyright 2012 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.
//! Runtime calls emitted by the compiler.
use cast::transmute;
use libc::{c_char, c_uchar, c_void, size_t, uintptr_t, c_int};
use str;
use sys;
use rt::{context, OldTaskContext};
use rt::task::Task;
use rt::local::Local;
use rt::borrowck;
#[allow(non_camel_case_types)]
pub type rust_task = c_void;
pub mod rustrt {
use unstable::lang::rust_task;
use libc::{c_char, uintptr_t};
pub extern {
#[rust_stack]
unsafe fn rust_upcall_malloc(td: *c_char, size: uintptr_t) -> *c_char;
#[rust_stack]
unsafe fn rust_upcall_free(ptr: *c_char);
#[fast_ffi]
unsafe fn rust_upcall_malloc_noswitch(td: *c_char,
size: uintptr_t)
-> *c_char;
#[rust_stack]
fn rust_try_get_task() -> *rust_task;
fn rust_dbg_breakpoint();
}
}
#[lang="fail_"]
pub fn fail_(expr: *c_char, file: *c_char, line: size_t) -> ! {
sys::begin_unwind_(expr, file, line);
}
#[lang="fail_bounds_check"]
pub fn fail_bounds_check(file: *c_char, line: size_t,
index: size_t, len: size_t) {
let msg = fmt!("index out of bounds: the len is %d but the index is %d",
len as int, index as int);
do str::as_buf(msg) |p, _len| {
fail_(p as *c_char, file, line);
}
}
#[lang="malloc"]
pub unsafe fn local_malloc(td: *c_char, size: uintptr_t) -> *c_char {
match context() {
OldTaskContext => {
return rustrt::rust_upcall_malloc_noswitch(td, size);
}
_ => {
let mut alloc = ::ptr::null();
do Local::borrow::<Task,()> |task| {
rtdebug!("task pointer: %x, heap pointer: %x",
to_uint(task),
to_uint(&task.heap));
alloc = task.heap.alloc(td as *c_void, size as uint) as *c_char;
}
return alloc;
}
}
}
// NB: Calls to free CANNOT be allowed to fail, as throwing an exception from
// inside a landing pad may corrupt the state of the exception handler. If a
// problem occurs, call exit instead.
#[lang="free"]
pub unsafe fn local_free(ptr: *c_char) {
::rt::local_heap::local_free(ptr);
}
#[lang="borrow_as_imm"]
#[inline]
pub unsafe fn borrow_as_imm(a: *u8, file: *c_char, line: size_t) -> uint {
borrowck::borrow_as_imm(a, file, line)
}
#[lang="borrow_as_mut"]
#[inline]
pub unsafe fn borrow_as_mut(a: *u8, file: *c_char, line: size_t) -> uint {
borrowck::borrow_as_mut(a, file, line)
}
#[lang="record_borrow"]
pub unsafe fn record_borrow(a: *u8, old_ref_count: uint,
file: *c_char, line: size_t) {
borrowck::record_borrow(a, old_ref_count, file, line)
}
#[lang="unrecord_borrow"]
pub unsafe fn unrecord_borrow(a: *u8, old_ref_count: uint,
file: *c_char, line: size_t) {
borrowck::unrecord_borrow(a, old_ref_count, file, line)
}
#[lang="return_to_mut"]
#[inline]
pub unsafe fn return_to_mut(a: *u8, orig_ref_count: uint,
file: *c_char, line: size_t) {
borrowck::return_to_mut(a, orig_ref_count, file, line)
}
#[lang="check_not_borrowed"]
#[inline]
pub unsafe fn check_not_borrowed(a: *u8,
file: *c_char,
line: size_t) {
borrowck::check_not_borrowed(a, file, line)
}
#[lang="strdup_uniq"]
#[inline]
pub unsafe fn strdup_uniq(ptr: *c_uchar, len: uint) -> ~str {
str::raw::from_buf_len(ptr, len)
}
#[lang="annihilate"]
pub unsafe fn annihilate() {
::cleanup::annihilate()
}
#[lang="start"]
pub fn start(main: *u8, argc: int, argv: **c_char,
crate_map: *u8) -> int {
use rt;
use os;
unsafe {
let use_old_rt = os::getenv("RUST_NEWRT").is_none();
if use_old_rt {
return rust_start(main as *c_void, argc as c_int, argv,
crate_map as *c_void) as int;
} else {
return do rt::start(argc, argv as **u8, crate_map) {
let main: extern "Rust" fn() = transmute(main);
main();
};
}
}
extern {
fn rust_start(main: *c_void, argc: c_int, argv: **c_char,
crate_map: *c_void) -> c_int;
}
}