JS_SET_TRACING_DETAILS
description set debugging information about a reference to a traceable thing to prepare for the following call to js_calltracer.
...the storage for name or callback's arguments needs to live only until the following call to js_calltracer returns.

JS_SetExtraGCRoots
callback syntax typedef void jstracedataop (jstracer *trc, void *data); argument meaning trc tracing data, to be passed through to js_calltracer.
... callback description generic trace operation that calls js_calltracer on additional traceable things.

JSAPI reference
idermonkey 1.8 js_traceruntime added in spidermonkey 1.8 jsval_is_traceable added in spidermonkey 1.8 obsolete since jsapi 31 jsval_to_traceable added in spidermonkey 1.8 obsolete since jsapi 31 jsval_trace_kind added in spidermonkey 1.8 obsolete since jsapi 31 js_tracer_init added in spidermonkey 1.8 obsolete since jsapi 12 js_tracerinit added in spidermonkey 12 obsolete since jsapi 31 js_calltracer added in spidermonkey 1.8 obsolete since jsapi 22 js_set_tracing_details added in spidermonkey 1.8 obsolete since jsapi 26 js_set_tracing_index added in spidermonkey 1.8 obsolete since jsapi 26 js_set_tracing_name added in spidermonkey 1.8 obsolete since jsapi 26 js_call_tracer added in spidermonkey 1.8 obsolete since jsapi 23 js_call_value_tracer added in spidermonkey 1.8 obsolete since jsa...