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6714404: Add UseStringCache switch to enable String caching under AggressiveOpts

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Poke String.stringCacheEnabled during vm initialization

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2008-06-13 14:49:07 -07:00
parent 762f7c8f2b
commit afbdf29629
3 changed files with 38 additions and 13 deletions
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47
hotspot/src/share/vm/runtime/thread.cpp
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@ -2926,21 +2926,42 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
}
if (AggressiveOpts) {
// Forcibly initialize java/util/HashMap and mutate the private
// static final "frontCacheEnabled" field before we start creating instances
{
// Forcibly initialize java/util/HashMap and mutate the private
// static final "frontCacheEnabled" field before we start creating instances
#ifdef ASSERT
klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0);
assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet");
klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0);
assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet");
#endif
klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0);
KlassHandle k = KlassHandle(THREAD, k_o);
guarantee(k.not_null(), "Must find java/util/HashMap");
instanceKlassHandle ik = instanceKlassHandle(THREAD, k());
ik->initialize(CHECK_0);
fieldDescriptor fd;
// Possible we might not find this field; if so, don't break
if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) {
k()->bool_field_put(fd.offset(), true);
klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0);
KlassHandle k = KlassHandle(THREAD, k_o);
guarantee(k.not_null(), "Must find java/util/HashMap");
instanceKlassHandle ik = instanceKlassHandle(THREAD, k());
ik->initialize(CHECK_0);
fieldDescriptor fd;
// Possible we might not find this field; if so, don't break
if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) {
k()->bool_field_put(fd.offset(), true);
}
}
if (UseStringCache) {
// Forcibly initialize java/lang/String and mutate the private
// static final "stringCacheEnabled" field before we start creating instances
#ifdef ASSERT
klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_lang_String(), Handle(), Handle(), CHECK_0);
assert(tmp_k == NULL, "java/lang/String should not be loaded yet");
#endif
klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_String(), Handle(), Handle(), CHECK_0);
KlassHandle k = KlassHandle(THREAD, k_o);
guarantee(k.not_null(), "Must find java/lang/String");
instanceKlassHandle ik = instanceKlassHandle(THREAD, k());
ik->initialize(CHECK_0);
fieldDescriptor fd;
// Possible we might not find this field; if so, don't break
if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) {
k()->bool_field_put(fd.offset(), true);
}
}
}