// Flags for Crankshaft.
DEFINE_bool(crankshaft, true, "use crankshaft")
-DEFINE_string(hydrogen_filter, "", "optimization filter")
+DEFINE_string(hydrogen_filter, "*", "optimization filter")
DEFINE_bool(use_range, true, "use hydrogen range analysis")
DEFINE_bool(use_gvn, true, "use hydrogen global value numbering")
DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
bool JSFunction::PassesHydrogenFilter() {
String* name = shared()->DebugName();
- if (*FLAG_hydrogen_filter != '\0') {
+ // The filter string is a pattern that matches functions in this way:
+ // "*" all; the default
+ // "-" all but the top-level function
+ // "-name" all but the function "name"
+ // "" only the top-level function
+ // "name" only the function "name"
+ // "name*" only functions starting with "name"
+ if (*FLAG_hydrogen_filter != '*') {
Vector<const char> filter = CStrVector(FLAG_hydrogen_filter);
+ if (filter.length() == 0) return name->length() == 0;
if (filter[0] != '-' && name->IsUtf8EqualTo(filter)) return true;
if (filter[0] == '-' &&
!name->IsUtf8EqualTo(filter.SubVector(1, filter.length()))) {