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Record the internal reference count of environment boxes. Closes #981

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This commit is contained in:
Brian Anderson 2011-10-21 13:27:44 -07:00
parent 6c4c33e009
commit 2d713215a8
2 changed files with 38 additions and 19 deletions
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47
src/rt/rust_cc.cpp
View File

@ -95,7 +95,12 @@ class irc : public shape::data<irc,shape::ptr> {
} }
void walk_fn() { void walk_fn() {
shape::data<irc,shape::ptr>::walk_fn_contents(dp); // Record an irc for the environment box, but don't descend
// into it since it will be walked via the box's allocation
dp += sizeof(void *); // skip code pointer
uint8_t * box_ptr = shape::bump_dp<uint8_t *>(dp);
shape::ptr ref_count_dp(box_ptr);
maybe_record_irc(ref_count_dp);
} }
void walk_obj() { void walk_obj() {
@ -114,28 +119,32 @@ class irc : public shape::data<irc,shape::ptr> {
void walk_subcontext(irc &sub) { sub.walk(); } void walk_subcontext(irc &sub) { sub.walk(); }
void walk_box_contents(irc &sub, shape::ptr &ref_count_dp) { void walk_box_contents(irc &sub, shape::ptr &ref_count_dp) {
if (!ref_count_dp) maybe_record_irc(ref_count_dp);
return;
// Bump the internal reference count of the box.
if (ircs.find((void *)ref_count_dp) == ircs.end()) {
LOG(task, gc,
"setting internal reference count for %p to 1",
(void *)ref_count_dp);
ircs[(void *)ref_count_dp] = 1;
} else {
uintptr_t newcount = ircs[(void *)ref_count_dp] + 1;
LOG(task, gc,
"bumping internal reference count for %p to %lu",
(void *)ref_count_dp, newcount);
ircs[(void *)ref_count_dp] = newcount;
}
// Do not traverse the contents of this box; it's in the allocation // Do not traverse the contents of this box; it's in the allocation
// somewhere, so we're guaranteed to come back to it (if we haven't // somewhere, so we're guaranteed to come back to it (if we haven't
// traversed it already). // traversed it already).
} }
void maybe_record_irc(shape::ptr &ref_count_dp) {
if (!ref_count_dp)
return;
// Bump the internal reference count of the box.
if (ircs.find((void *)ref_count_dp) == ircs.end()) {
LOG(task, gc,
"setting internal reference count for %p to 1",
(void *)ref_count_dp);
ircs[(void *)ref_count_dp] = 1;
} else {
uintptr_t newcount = ircs[(void *)ref_count_dp] + 1;
LOG(task, gc,
"bumping internal reference count for %p to %lu",
(void *)ref_count_dp, newcount);
ircs[(void *)ref_count_dp] = newcount;
}
}
void walk_struct(const uint8_t *end_sp) { void walk_struct(const uint8_t *end_sp) {
while (this->sp != end_sp) { while (this->sp != end_sp) {
this->walk(); this->walk();
@ -231,8 +240,8 @@ find_roots(rust_task *task, irc_map &ircs, std::vector<void *> &roots) {
} else { } else {
LOG(task, gc, "nonroot found: %p, irc %lu, ref count %lu", LOG(task, gc, "nonroot found: %p, irc %lu, ref count %lu",
alloc, irc, ref_count); alloc, irc, ref_count);
/*assert(irc == ref_count && "Internal reference count must be " assert(irc == ref_count && "Internal reference count must be "
"less than or equal to the total reference count!");*/ "less than or equal to the total reference count!");
} }
++begin; ++begin;

10
src/test/run-pass/cycle-collection2.rs Normal file
View File

@ -0,0 +1,10 @@
type foo = { mutable z : fn@() };
fn nop() { }
fn nop_foo(_x : @foo) { }
fn main() {
let w = @{ mutable z: bind nop() };
let x = bind nop_foo(w);
w.z = x;
}