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protect access to embedded VALUEs in a struct that will clear be aware if the VALUE has become garbage collected.

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This commit is contained in:
Charles Lowell 2011-05-26 11:28:02 -05:00
parent cfa2570e3f
commit a6c7757b6e
1 changed files with 41 additions and 11 deletions
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52
ext/v8/v8_external.cpp
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@ -9,21 +9,52 @@ namespace {
VALUE ExternalClass;
VALUE references;
struct Weaklink {
bool finalized_from_rb;
bool finalized_from_v8;
VALUE target;
};
VALUE Weaklink_finalized_from_ruby(VALUE object_id, VALUE data) {
Weaklink* link = 0;
Data_Get_Struct(data, struct Weaklink, link);
link->finalized_from_rb = true;
if (link->finalized_from_v8) {
delete link;
}
return Qnil;
}
void Weaklink_finalized_from_v8(Persistent<Value> value, void* data) {
Weaklink* link = (Weaklink*)data;
link->finalized_from_v8 = true;
if (link->finalized_from_rb) {
delete link;
}
value.Dispose();
}
VALUE New(VALUE self, VALUE value) {
HandleScope scope;
return rr_v8_handle_new(self, External::New((void*)value));
}
VALUE Unwrap(VALUE self, VALUE value) {
HandleScope scope;
if (rb_obj_is_kind_of(value, self)) {
return (VALUE)External::Unwrap(rr_v8_handle<External>(self));
} else {
rb_raise(rb_eArgError, "cannot unwrap %s. It is not a kind of %s", RSTRING_PTR(rb_class_name(rb_class_of(value))), RSTRING_PTR(rb_class_name(self)));
return Qnil;
}
Weaklink* link = new Weaklink();
link->finalized_from_v8 = false;
link->finalized_from_rb = false;
link->target = value;
Persistent<External> external = Persistent<External>::New(External::New((void*)link));
external.MakeWeak(link,Weaklink_finalized_from_v8);
VALUE finalizer_data = Data_Wrap_Struct(rb_cObject, 0, 0, link);
rr_define_finalizer(value, (void*)Weaklink_finalized_from_ruby, finalizer_data);
return rr_v8_handle_new(self, external);
}
VALUE _Value(VALUE self) {
HandleScope scope;
Weaklink* link = (Weaklink*)rr_v8_handle<External>(self)->Value();
if (link->finalized_from_rb) {
rb_warn("an active v8::External wraps a VALUE that has already been finalized! This is not good.\n");
return Qnil;
} else {
return link->target;
}
return (VALUE)rr_v8_handle<External>(self)->Value();
}
}
@ -31,7 +62,6 @@ namespace {
void rr_init_v8_external() {
ExternalClass = rr_define_class("External", rr_v8_value_class());
rr_define_singleton_method(ExternalClass, "New", New, 1);
rr_define_singleton_method(ExternalClass, "Unwrap", Unwrap, 1);
rr_define_method(ExternalClass, "Value", _Value, 0);
}