forked from GitHub/bdwgc-rust
114 lines
2.9 KiB
Rust
114 lines
2.9 KiB
Rust
extern crate libc;
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mod error;
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use libc::{c_int, c_void, size_t};
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use std::alloc::{GlobalAlloc, Layout};
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const GC_SUCCESS: c_int = 0;
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#[repr(C)]
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struct GcStackBase {
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mem_base: *const c_void,
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// TODO: Add reg_base field to support IA64.
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}
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#[link(name = "gc", kind = "static")]
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extern "C" {
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fn GC_allow_register_threads();
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fn GC_alloc_lock();
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fn GC_alloc_unlock();
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fn GC_free(ptr: *mut c_void);
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fn GC_get_stack_base(stack_base: *mut GcStackBase) -> c_int;
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fn GC_init();
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fn GC_malloc(size: size_t) -> *mut c_void;
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fn GC_realloc(ptr: *mut c_void, size: size_t) -> *mut c_void;
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fn GC_register_my_thread(stack_base: *const GcStackBase) -> c_int;
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fn GC_set_stackbottom(thread: *const c_void, stack_bottom: *const GcStackBase);
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fn GC_unregister_my_thread();
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fn GC_gcollect();
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fn GC_register_finalizer(
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ptr: *const c_void,
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finalizer: extern "C" fn(*mut c_void, *mut c_void),
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client_data: *const c_void,
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opt_old_finalizer: *const c_void,
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opt_old_client_data: *const c_void,
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) -> *mut c_void;
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}
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pub struct Allocator;
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impl Allocator {
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pub fn lock() {
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unsafe { GC_alloc_lock() }
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}
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pub fn unlock() {
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unsafe { GC_alloc_unlock() }
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}
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pub unsafe fn initialize() {
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GC_init();
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GC_allow_register_threads();
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}
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pub unsafe fn register_current_thread() -> Result<(), error::Error> {
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let mut base = GcStackBase {
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mem_base: std::ptr::null(),
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};
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if GC_get_stack_base(&mut base) != GC_SUCCESS {
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return Err(error::Error::new("failed to get stack base"));
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} else if GC_register_my_thread(&base) != GC_SUCCESS {
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return Err(error::Error::new("failed to register a thread for GC"));
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}
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Ok(())
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}
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pub unsafe fn set_stack_bottom(bottom: *const u8) {
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GC_set_stackbottom(
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std::ptr::null(),
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&GcStackBase {
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mem_base: bottom as *const libc::c_void,
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},
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)
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}
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pub unsafe fn unregister_current_thread() {
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GC_unregister_my_thread()
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}
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pub fn force_collect() {
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unsafe { GC_gcollect() }
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}
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pub unsafe fn register_finalizer(
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ptr: *const c_void,
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finalizer: extern "C" fn(*mut c_void, *mut c_void),
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client_data: *const c_void,
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) {
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GC_register_finalizer(
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ptr,
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finalizer,
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client_data,
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std::ptr::null(),
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std::ptr::null(),
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);
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}
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}
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unsafe impl GlobalAlloc for Allocator {
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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GC_malloc(layout.size()) as *mut u8
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}
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unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
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GC_free(ptr as *mut c_void)
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}
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unsafe fn realloc(&self, ptr: *mut u8, _layout: Layout, size: usize) -> *mut u8 {
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GC_realloc(ptr as *mut c_void, size) as *mut u8
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}
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}
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