void callback(void **thingp, JSGCTraceKind kind) {
if (!okay)
return;
char16_t *name16 = nullptr;
if (wantNames) {
// Ask the tracer to compute an edge name for us.
char buffer[1024];
const char *name = getTracingEdgeName(buffer, sizeof(buffer));
// Convert the name to char16_t characters.
name16 = js_pod_malloc<char16_t>(strlen(name) + 1);
if (!name16) {
okay = false;
return;
}
size_t i;
for (i = 0; name[i]; i++)
name16[i] = name[i];
name16[i] = '\0';
}
// The simplest code is correct! The temporary SimpleEdge takes
// ownership of name; if the append succeeds, the vector element
// then takes ownership; if the append fails, then the temporary
// retains it, and its destructor will free it.
if (!vec->append(mozilla::Move(SimpleEdge(name16, Node(kind, *thingp))))) {
okay = false;
return;
}
}
void onChild(const JS::GCCellPtr& thing) override {
if (!okay)
return;
// Don't trace permanent atoms and well-known symbols that are owned by
// a parent JSRuntime.
if (thing.is<JSString>() && thing.as<JSString>().isPermanentAtom())
return;
if (thing.is<JS::Symbol>() && thing.as<JS::Symbol>().isWellKnownSymbol())
return;
char16_t* name16 = nullptr;
if (wantNames) {
// Ask the tracer to compute an edge name for us.
char buffer[1024];
getTracingEdgeName(buffer, sizeof(buffer));
const char* name = buffer;
// Convert the name to char16_t characters.
name16 = js_pod_malloc<char16_t>(strlen(name) + 1);
if (!name16) {
okay = false;
return;
}
size_t i;
for (i = 0; name[i]; i++)
name16[i] = name[i];
name16[i] = '\0';
}
// The simplest code is correct! The temporary SimpleEdge takes
// ownership of name; if the append succeeds, the vector element
// then takes ownership; if the append fails, then the temporary
// retains it, and its destructor will free it.
if (!vec->append(mozilla::Move(SimpleEdge(name16, Node(thing))))) {
okay = false;
return;
}
}
void settle() {
front_ = i < edges.length() ? &edges[i] : nullptr;
}