{"json_modified": "2016-03-28T08:41:37.043167", "uuid": "faf071c3-0832-4d2f-9631-c26a2e83f889", "title": "JSMarkOp", "url": "/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSMarkOp", "tags": ["Obsolete", "R\u00e9f\u00e9rence", "Reference", "SpiderMonkey", "JSAPI Reference"], "translations": [], "modified": "2015-01-18T15:17:52", "label": "JSMarkOp", "localization_tags": [], "locale": "en-US", "id": 133145, "last_edit": "2015-01-18T15:17:43", "summary": "Call <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JS_MarkGCThing\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>JS_MarkGCThing</code></a> for each GC thing directly reachable from <code>obj</code>. Use <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSVAL_IS_GCTHING\" title=\"JSVAL_IS_GCTHING(v) is true if the jsval v is either JSVAL_NULL or a reference to a value that is subject to garbage collection. JavaScript performs automatic garbage collection of objects, strings, and doubles.\"><code>JSVAL_IS_GCTHING</code></a> to check whether a value needs to be marked and <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSVAL_TO_GCTHING\" title=\"JSVAL_TO_GCTHING casts a jsval, v, to a raw pointer. The type of the result is void *.\"><code>JSVAL_TO_GCTHING</code></a> to convert the <code>jsval</code> to a pointer.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Description", "title": "Description"}, {"id": "JSClass_hooks", "title": null}, {"id": "See_Also", "title": "See Also"}], "slug": "Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSMarkOp", "review_tags": ["technical"]}