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Create a Runtime struct to manage JSRuntime and JSContext.

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I intend to move this struct into rust-mozjs, but I kept it here for easier
iteration for now.
This commit is contained in:
Ms2ger 2015-04-10 12:40:29 +02:00
parent d46db6d7f1
commit 24ef5baf66
1 changed files with 44 additions and 25 deletions
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69
components/script/script_task.rs
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@ -239,6 +239,49 @@ impl Drop for StackRootTLS {
}
}
/// A wrapper for the `JSRuntime` and `JSContext` structures in SpiderMonkey.
pub struct Runtime {
rt: js::rust::rt,
cx: Rc<Cx>,
}
impl Runtime {
/// Creates a new `JSRuntime` and `JSContext`.
pub fn new() -> Runtime {
let js_runtime = js::rust::rt();
assert!({
let ptr: *mut JSRuntime = (*js_runtime).ptr;
!ptr.is_null()
});
// Unconstrain the runtime's threshold on nominal heap size, to avoid
// triggering GC too often if operating continuously near an arbitrary
// finite threshold. This leaves the maximum-JS_malloc-bytes threshold
// still in effect to cause periodical, and we hope hygienic,
// last-ditch GCs from within the GC's allocator.
unsafe {
JS_SetGCParameter(js_runtime.ptr, JSGC_MAX_BYTES, u32::MAX);
}
let js_context = js_runtime.cx();
assert!({
let ptr: *mut JSContext = (*js_context).ptr;
!ptr.is_null()
});
js_context.set_default_options_and_version();
js_context.set_logging_error_reporter();
unsafe {
JS_SetGCZeal((*js_context).ptr, 0, JS_DEFAULT_ZEAL_FREQ);
}
Runtime {
rt: js_runtime,
cx: js_context,
}
}
}
/// Information for an entire page. Pages are top-level browsing contexts and can contain multiple
/// frames.
///
@ -457,35 +500,11 @@ impl ScriptTask {
pub fn new_rt_and_cx() -> (js::rust::rt, Rc<Cx>) {
LiveDOMReferences::initialize();
let js_runtime = js::rust::rt();
assert!({
let ptr: *mut JSRuntime = (*js_runtime).ptr;
!ptr.is_null()
});
let Runtime { rt: js_runtime, cx: js_context } = Runtime::new();
unsafe {
JS_SetExtraGCRootsTracer((*js_runtime).ptr, Some(trace_rust_roots), ptr::null_mut());
}
// Unconstrain the runtime's threshold on nominal heap size, to avoid
// triggering GC too often if operating continuously near an arbitrary
// finite threshold. This leaves the maximum-JS_malloc-bytes threshold
// still in effect to cause periodical, and we hope hygienic,
// last-ditch GCs from within the GC's allocator.
unsafe {
JS_SetGCParameter(js_runtime.ptr, JSGC_MAX_BYTES, u32::MAX);
}
let js_context = js_runtime.cx();
assert!({
let ptr: *mut JSContext = (*js_context).ptr;
!ptr.is_null()
});
js_context.set_default_options_and_version();
js_context.set_logging_error_reporter();
unsafe {
JS_SetGCZeal((*js_context).ptr, 0, JS_DEFAULT_ZEAL_FREQ);
}
// Needed for debug assertions about whether GC is running.
if !cfg!(ndebug) {