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6964458: Reimplement class meta-data storage to use native memory

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Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes

Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com>
Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com>
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
This commit is contained in:
Jon Masamitsu 2012-09-01 13:25:18 -04:00 • committed by Coleen Phillimore
parent 36eee7c8c8
commit 5c58d27aac
853 changed files with 26124 additions and 82956 deletions
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40
hotspot/src/share/vm/prims/whitebox.cpp
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@ -28,6 +28,7 @@
#include "oops/oop.inline.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/classLoaderData.hpp"
#include "prims/whitebox.hpp"
#include "prims/wbtestmethods/parserTests.hpp"
@ -52,6 +53,38 @@ WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
return heapOopSize;
WB_END
class WBIsKlassAliveClosure : public KlassClosure {
Symbol* _name;
bool _found;
public:
WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
void do_klass(Klass* k) {
if (_found) return;
Symbol* ksym = k->name();
if (ksym->fast_compare(_name) == 0) {
_found = true;
}
}
bool found() const {
return _found;
}
};
WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
Handle h_name = JNIHandles::resolve(name);
if (h_name.is_null()) return false;
Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
WBIsKlassAliveClosure closure(sym);
ClassLoaderDataGraph::classes_do(&closure);
return closure.found();
WB_END
#ifndef SERIALGC
WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
G1CollectedHeap* g1 = G1CollectedHeap::heap();
@ -84,9 +117,9 @@ int WhiteBox::offset_for_field(const char* field_name, oop object,
Thread* THREAD = Thread::current();
//Get the class of our object
klassOop arg_klass = object->klass();
Klass* arg_klass = object->klass();
//Turn it into an instance-klass
instanceKlass* ik = instanceKlass::cast(arg_klass);
InstanceKlass* ik = InstanceKlass::cast(arg_klass);
//Create symbols to look for in the class
TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
@ -95,7 +128,7 @@ int WhiteBox::offset_for_field(const char* field_name, oop object,
//To be filled in with an offset of the field we're looking for
fieldDescriptor fd;
klassOop res = ik->find_field(name_symbol, signature_symbol, &fd);
Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
if (res == NULL) {
tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
name_symbol->as_C_string());
@ -133,6 +166,7 @@ bool WhiteBox::lookup_bool(const char* field_name, oop object) {
static JNINativeMethod methods[] = {
{CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress },
{CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
{CC"isClassAlive0", CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive },
{CC "parseCommandLine",
CC "(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
(void*) &WB_ParseCommandLine