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Separate disposing of layout data from the GCing of the DOM object reflectors. Change the order of operations when shutting down the script task to ensure that Window globals aren't used after they've been GCed.

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This commit is contained in:
Josh Matthews 2015-02-26 00:19:27 -05:00
parent c816975750
commit 4972b623e1
3 changed files with 20 additions and 11 deletions
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19
components/script/script_task.rs
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@ -74,7 +74,7 @@ use util::task_state;
use geom::Rect;
use geom::point::Point2D;
use hyper::header::{LastModified, Headers};
use js::jsapi::{JS_SetWrapObjectCallbacks, JS_SetGCZeal, JS_DEFAULT_ZEAL_FREQ, JS_GC};
use js::jsapi::{JS_SetWrapObjectCallbacks, JS_SetGCZeal, JS_DEFAULT_ZEAL_FREQ};
use js::jsapi::{JSContext, JSRuntime, JSObject};
use js::jsapi::{JS_SetGCParameter, JSGC_MAX_BYTES};
use js::jsapi::{JS_SetGCCallback, JSGCStatus, JSGC_BEGIN, JSGC_END};
@ -845,14 +845,16 @@ impl ScriptTask {
let window = page.window().root();
if window.r().pipeline() == id {
debug!("shutting down layout for root page {:?}", id);
// To ensure the elements of the DOM tree remain usable (such as the window global),
// don't free the JS context until all interactions with it are finished.
shut_down_layout(&page, exit_type);
*self.js_context.borrow_mut() = None;
shut_down_layout(&page, (*self.js_runtime).ptr, exit_type);
return true
}
// otherwise find just the matching page and exit all sub-pages
if let Some(ref mut child_page) = page.remove(id) {
shut_down_layout(&*child_page, (*self.js_runtime).ptr, exit_type);
shut_down_layout(&*child_page, exit_type);
}
return false;
}
@ -1167,7 +1169,7 @@ impl ScriptTask {
}
/// Shuts down layout for the given page tree.
fn shut_down_layout(page_tree: &Rc<Page>, rt: *mut JSRuntime, exit_type: PipelineExitType) {
fn shut_down_layout(page_tree: &Rc<Page>, exit_type: PipelineExitType) {
let mut channels = vec!();
for page in page_tree.iter() {
@ -1182,19 +1184,14 @@ fn shut_down_layout(page_tree: &Rc<Page>, rt: *mut JSRuntime, exit_type: Pipelin
}
}
// Drop our references to the JSContext and DOM objects, potentially triggering a GC.
// Drop our references to the JSContext and DOM objects.
for page in page_tree.iter() {
let window = page.window().root();
window.r().clear_js_context();
// Sever the connection between the global and the DOM tree
page.set_frame(None);
}
// Force a GC to make sure that our DOM reflectors are released before we tell
// layout to exit.
unsafe {
JS_GC(rt);
}
// Destroy the layout task. If there were node leaks, layout will now crash safely.
for chan in channels.into_iter() {
chan.send(layout_interface::Msg::ExitNow(exit_type)).ok();