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6621621: HashMap front cache should be enabled only with AggressiveOpts

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Reviewed-by: sbohne, xlu
This commit is contained in:
Paul Hohensee 2007-12-05 09:02:00 -08:00
parent 10c473e425
commit 4abbae1fc2
2 changed files with 22 additions and 1 deletions
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4
hotspot/src/share/vm/classfile/vmSymbols.hpp
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@ -96,10 +96,11 @@
template(java_util_Vector, "java/util/Vector") \
template(java_util_AbstractList, "java/util/AbstractList") \
template(java_util_Hashtable, "java/util/Hashtable") \
template(java_util_HashMap, "java/util/HashMap") \
template(java_lang_Compiler, "java/lang/Compiler") \
template(sun_misc_Signal, "sun/misc/Signal") \
template(java_lang_AssertionStatusDirectives, "java/lang/AssertionStatusDirectives") \
template(sun_jkernel_DownloadManager, "sun/jkernel/DownloadManager") \
template(sun_jkernel_DownloadManager, "sun/jkernel/DownloadManager") \
template(getBootClassPathEntryForClass_name, "getBootClassPathEntryForClass") \
\
/* class file format tags */ \
@ -281,6 +282,7 @@
template(park_event_name, "nativeParkEventPointer") \
template(cache_field_name, "cache") \
template(value_name, "value") \
template(frontCacheEnabled_name, "frontCacheEnabled") \
\
/* non-intrinsic name/signature pairs: */ \
template(register_method_name, "register") \

19
hotspot/src/share/vm/runtime/thread.cpp
View File

@ -2925,6 +2925,25 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
warning("java.lang.String not initialized");
}
if (AggressiveOpts) {
// 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");
#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);
}
}
// Initialize java_lang.System (needed before creating the thread)
if (InitializeJavaLangSystem) {
initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0);