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8141132: JEP 254: Compact Strings

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Adopt a more space-efficient internal representation for strings.

Co-authored-by: Brent Christian <brent.christian@oracle.com>
Co-authored-by: Vivek Deshpande <vivek.r.deshpande@intel.com>
Co-authored-by: Charlie Hunt <charlie.hunt@oracle.com>
Co-authored-by: Vladimir Kozlov <vladimir.kozlov@oracle.com>
Co-authored-by: Roger Riggs <roger.riggs@oracle.com>
Co-authored-by: Xueming Shen <xueming.shen@oracle.com>
Co-authored-by: Aleksey Shipilev <aleksey.shipilev@oracle.com>
Co-authored-by: Sandhya Viswanathan <sandhya.viswanathan@intel.com>
Reviewed-by: alanb, bdelsart, coleenp, iklam, jiangli, jrose, kevinw, naoto, pliden, roland, smarks, twisti
This commit is contained in:
Tobias Hartmann 2015-11-03 09:41:03 +01:00
parent 4e24e2cc6c
commit 7af927f9c1
74 changed files with 4838 additions and 1683 deletions
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15
hotspot/src/share/vm/runtime/thread.cpp
View file

@ -2933,12 +2933,8 @@ const char* JavaThread::get_threadgroup_name() const {
if (thread_obj != NULL) {
oop thread_group = java_lang_Thread::threadGroup(thread_obj);
if (thread_group != NULL) {
typeArrayOop name = java_lang_ThreadGroup::name(thread_group);
// ThreadGroup.name can be null
if (name != NULL) {
const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
return str;
}
return java_lang_ThreadGroup::name(thread_group);
}
}
return NULL;
@ -2952,12 +2948,8 @@ const char* JavaThread::get_parent_name() const {
if (thread_group != NULL) {
oop parent = java_lang_ThreadGroup::parent(thread_group);
if (parent != NULL) {
typeArrayOop name = java_lang_ThreadGroup::name(parent);
// ThreadGroup.name can be null
if (name != NULL) {
const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
return str;
}
return java_lang_ThreadGroup::name(parent);
}
}
}
@ -3304,6 +3296,9 @@ void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) {
initialize_class(vmSymbols::java_lang_String(), CHECK);
// Inject CompactStrings value after the static initializers for String ran.
java_lang_String::set_compact_strings(CompactStrings);
// Initialize java_lang.System (needed before creating the thread)
initialize_class(vmSymbols::java_lang_System(), CHECK);
// The VM creates & returns objects of this class. Make sure it's initialized.