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gc: Add early abort when GC is disabled.

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This commit is contained in:
Elliott Slaughter 2012-09-06 21:22:50 -07:00
parent 244b95490b
commit cb53623341
1 changed files with 15 additions and 0 deletions
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15
src/libcore/gc.rs
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@ -65,6 +65,11 @@ unsafe fn align_to_pointer<T>(ptr: *T) -> *T {
return unsafe::reinterpret_cast(&ptr);
}
unsafe fn get_safe_point_count() -> uint {
let module_meta = rustrt::rust_gc_metadata();
return *module_meta;
}
type SafePoint = { sp_meta: *Word, fn_meta: *Word };
// Returns the safe point metadata for the given program counter, if
@ -260,6 +265,11 @@ unsafe fn walk_gc_roots(mem: Memory, sentinel: **Word, visitor: Visitor) {
fn gc() {
unsafe {
// Abort when GC is disabled.
if get_safe_point_count() == 0 {
return;
}
for walk_gc_roots(task_local_heap, ptr::null()) |_root, _tydesc| {
// FIXME(#2997): Walk roots and mark them.
io::stdout().write([46]); // .
@ -288,6 +298,11 @@ fn expect_sentinel() -> bool { false }
// dead.
fn cleanup_stack_for_failure() {
unsafe {
// Abort when GC is disabled.
if get_safe_point_count() == 0 {
return;
}
// Leave a sentinel on the stack to mark the current frame. The
// stack walker will ignore any frames above the sentinel, thus
// avoiding collecting any memory being used by the stack walker