graal-compiler: src/share/vm/memory/dump.cpp comparison

comparison src/share/vm/memory/dump.cpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	ba764ed4b6f2

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--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_dump.cpp.incl"
+// Closure to set up the fingerprint field for all methods.
+class FingerprintMethodsClosure: public ObjectClosure {
+public:
+void do_object(oop obj) {
+if (obj->is_method()) {
+methodOop mobj = (methodOop)obj;
+ResourceMark rm;
+(new Fingerprinter(mobj))->fingerprint();
+}
+}
+};
+// Closure to set the hash value (String.hash field) in all of the
+// String objects in the heap.  Setting the hash value is not required.
+// However, setting the value in advance prevents the value from being
+// written later, increasing the likelihood that the shared page contain
+// the hash can be shared.
+//
+// NOTE THAT the algorithm in StringTable::hash_string() MUST MATCH the
+// algorithm in java.lang.String.hashCode().
+class StringHashCodeClosure: public OopClosure {
+private:
+Thread* THREAD;
+int hash_offset;
+public:
+StringHashCodeClosure(Thread* t) {
+THREAD = t;
+hash_offset = java_lang_String::hash_offset_in_bytes();
+}
+void do_oop(oop* pobj) {
+if (pobj != NULL) {
+oop obj = *pobj;
+if (obj->klass() == SystemDictionary::string_klass()) {
+int hash;
+typeArrayOop value = java_lang_String::value(obj);
+int length = java_lang_String::length(obj);
+if (length == 0) {
+hash = 0;
+} else {
+int offset = java_lang_String::offset(obj);
+jchar* s = value->char_at_addr(offset);
+hash = StringTable::hash_string(s, length);
+}
+obj->int_field_put(hash_offset, hash);
+}
+}
+}
+};
+// Remove data from objects which should not appear in the shared file
+// (as it pertains only to the current JVM).
+class RemoveUnshareableInfoClosure : public ObjectClosure {
+public:
+void do_object(oop obj) {
+// Zap data from the objects which is pertains only to this JVM.  We
+// want that data recreated in new JVMs when the shared file is used.
+if (obj->is_method()) {
+((methodOop)obj)->remove_unshareable_info();
+}
+else if (obj->is_klass()) {
+Klass::cast((klassOop)obj)->remove_unshareable_info();
+}
+// Don't save compiler related special oops (shouldn't be any yet).
+if (obj->is_methodData() || obj->is_compiledICHolder()) {
+ShouldNotReachHere();
+}
+}
+};
+static bool mark_object(oop obj) {
+if (obj != NULL &&
+!obj->is_shared() &&
+!obj->is_forwarded() &&
+!obj->is_gc_marked()) {
+obj->set_mark(markOopDesc::prototype()->set_marked());
+return true;
+}
+return false;
+}
+// Closure:  mark objects closure.
+class MarkObjectsOopClosure : public OopClosure {
+public:
+void do_oop(oop* pobj) {
+mark_object(*pobj);
+}
+};
+class MarkObjectsSkippingKlassesOopClosure : public OopClosure {
+public:
+void do_oop(oop* pobj) {
+oop obj = *pobj;
+if (obj != NULL &&
+!obj->is_klass()) {
+mark_object(obj);
+}
+}
+};
+static void mark_object_recursive_skipping_klasses(oop obj) {
+mark_object(obj);
+if (obj != NULL) {
+MarkObjectsSkippingKlassesOopClosure mark_all;
+obj->oop_iterate(&mark_all);
+}
+}
+// Closure:  mark common read-only objects, excluding symbols
+class MarkCommonReadOnly : public ObjectClosure {
+private:
+MarkObjectsOopClosure mark_all;
+public:
+void do_object(oop obj) {
+// Mark all constMethod objects.
+if (obj->is_constMethod()) {
+mark_object(obj);
+mark_object(constMethodOop(obj)->stackmap_data());
+// Exception tables are needed by ci code during compilation.
+mark_object(constMethodOop(obj)->exception_table());
+}
+// Mark objects referenced by klass objects which are read-only.
+else if (obj->is_klass()) {
+Klass* k = Klass::cast((klassOop)obj);
+mark_object(k->secondary_supers());
+// The METHODS() OBJARRAYS CANNOT BE MADE READ-ONLY, even though
+// it is never modified. Otherwise, they will be pre-marked; the
+// GC marking phase will skip them; and by skipping them will fail
+// to mark the methods objects referenced by the array.
+if (obj->blueprint()->oop_is_instanceKlass()) {
+instanceKlass* ik = instanceKlass::cast((klassOop)obj);
+mark_object(ik->method_ordering());
+mark_object(ik->local_interfaces());
+mark_object(ik->transitive_interfaces());
+mark_object(ik->fields());
+mark_object(ik->class_annotations());
+mark_object_recursive_skipping_klasses(ik->fields_annotations());
+mark_object_recursive_skipping_klasses(ik->methods_annotations());
+mark_object_recursive_skipping_klasses(ik->methods_parameter_annotations());
+mark_object_recursive_skipping_klasses(ik->methods_default_annotations());
+typeArrayOop inner_classes = ik->inner_classes();
+if (inner_classes != NULL) {
+mark_object(inner_classes);
+}
+}
+}
+}
+};
+// Closure:  mark common symbols
+class MarkCommonSymbols : public ObjectClosure {
+private:
+MarkObjectsOopClosure mark_all;
+public:
+void do_object(oop obj) {
+// Mark symbols refered to by method objects.
+if (obj->is_method()) {
+methodOop m = methodOop(obj);
+mark_object(m->name());
+mark_object(m->signature());
+}
+// Mark symbols referenced by klass objects which are read-only.
+else if (obj->is_klass()) {
+if (obj->blueprint()->oop_is_instanceKlass()) {
+instanceKlass* ik = instanceKlass::cast((klassOop)obj);
+mark_object(ik->name());
+mark_object(ik->generic_signature());
+mark_object(ik->source_file_name());
+mark_object(ik->source_debug_extension());
+typeArrayOop inner_classes = ik->inner_classes();
+if (inner_classes != NULL) {
+int length = inner_classes->length();
+for (int i = 0;
+i < length;
+i += instanceKlass::inner_class_next_offset) {
+int ioff = i + instanceKlass::inner_class_inner_name_offset;
+int index = inner_classes->ushort_at(ioff);
+if (index != 0) {
+mark_object(ik->constants()->symbol_at(index));
+}
+}
+}
+ik->field_names_and_sigs_iterate(&mark_all);
+}
+}
+// Mark symbols referenced by other constantpool entries.
+if (obj->is_constantPool()) {
+constantPoolOop(obj)->shared_symbols_iterate(&mark_all);
+}
+}
+};
+// Closure:  mark char arrays used by strings
+class MarkStringValues : public ObjectClosure {
+private:
+MarkObjectsOopClosure mark_all;
+public:
+void do_object(oop obj) {
+// Character arrays referenced by String objects are read-only.
+if (java_lang_String::is_instance(obj)) {
+mark_object(java_lang_String::value(obj));
+}
+}
+};
+#ifdef DEBUG
+// Closure:  Check for objects left in the heap which have not been moved.
+class CheckRemainingObjects : public ObjectClosure {
+private:
+int count;
+public:
+CheckRemainingObjects() {
+count = 0;
+}
+void do_object(oop obj) {
+if (!obj->is_shared() &&
+!obj->is_forwarded()) {
+++count;
+if (Verbose) {
+tty->print("Unreferenced object: ");
+obj->print_on(tty);
+}
+}
+}
+void status() {
+tty->print_cr("%d objects no longer referenced, not shared.", count);
+}
+};
+#endif
+// Closure:  Mark remaining objects read-write, except Strings.
+class MarkReadWriteObjects : public ObjectClosure {
+private:
+MarkObjectsOopClosure mark_objects;
+public:
+void do_object(oop obj) {
+// The METHODS() OBJARRAYS CANNOT BE MADE READ-ONLY, even though
+// it is never modified. Otherwise, they will be pre-marked; the
+// GC marking phase will skip them; and by skipping them will fail
+// to mark the methods objects referenced by the array.
+if (obj->is_klass()) {
+mark_object(obj);
+Klass* k = klassOop(obj)->klass_part();
+mark_object(k->java_mirror());
+if (obj->blueprint()->oop_is_instanceKlass()) {
+instanceKlass* ik = (instanceKlass*)k;
+mark_object(ik->methods());
+mark_object(ik->constants());
+}
+if (obj->blueprint()->oop_is_javaArray()) {
+arrayKlass* ak = (arrayKlass*)k;
+mark_object(ak->component_mirror());
+}
+return;
+}
+// Mark constantPool tags and the constantPoolCache.
+else if (obj->is_constantPool()) {
+constantPoolOop pool = constantPoolOop(obj);
+mark_object(pool->cache());
+pool->shared_tags_iterate(&mark_objects);
+return;
+}
+// Mark all method objects.
+if (obj->is_method()) {
+mark_object(obj);
+}
+}
+};
+// Closure:  Mark String objects read-write.
+class MarkStringObjects : public ObjectClosure {
+private:
+MarkObjectsOopClosure mark_objects;
+public:
+void do_object(oop obj) {
+// Mark String objects referenced by constant pool entries.
+if (obj->is_constantPool()) {
+constantPoolOop pool = constantPoolOop(obj);
+pool->shared_strings_iterate(&mark_objects);
+return;
+}
+}
+};
+// Move objects matching specified type (ie. lock_bits) to the specified
+// space.
+class MoveMarkedObjects : public ObjectClosure {
+private:
+OffsetTableContigSpace* _space;
+bool _read_only;
+public:
+MoveMarkedObjects(OffsetTableContigSpace* space, bool read_only) {
+_space = space;
+_read_only = read_only;
+}
+void do_object(oop obj) {
+if (obj->is_shared()) {
+return;
+}
+if (obj->is_gc_marked() && obj->forwardee() == NULL) {
+int s = obj->size();
+oop sh_obj = (oop)_space->allocate(s);
+if (sh_obj == NULL) {
+if (_read_only) {
+warning("\nThe permanent generation read only space is not large "
+"enough to \npreload requested classes.  Use "
+"-XX:SharedReadOnlySize= to increase \nthe initial "
+"size of the read only space.\n");
+} else {
+warning("\nThe permanent generation read write space is not large "
+"enough to \npreload requested classes.  Use "
+"-XX:SharedReadWriteSize= to increase \nthe initial "
+"size of the read write space.\n");
+}
+exit(2);
+}
+if (PrintSharedSpaces && Verbose && WizardMode) {
+tty->print_cr("\nMoveMarkedObjects: " PTR_FORMAT " -> " PTR_FORMAT " %s", obj, sh_obj,
+(_read_only ? "ro" : "rw"));
+}
+Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)sh_obj, s);
+obj->forward_to(sh_obj);
+if (_read_only) {
+// Readonly objects: set hash value to self pointer and make gc_marked.
+sh_obj->forward_to(sh_obj);
+} else {
+sh_obj->init_mark();
+}
+}
+}
+};
+static void mark_and_move(oop obj, MoveMarkedObjects* move) {
+if (mark_object(obj)) move->do_object(obj);
+}
+enum order_policy {
+OP_favor_startup = 0,
+OP_balanced = 1,
+OP_favor_runtime = 2
+};
+static void mark_and_move_for_policy(order_policy policy, oop obj, MoveMarkedObjects* move) {
+if (SharedOptimizeColdStartPolicy >= policy) mark_and_move(obj, move);
+}
+class MarkAndMoveOrderedReadOnly : public ObjectClosure {
+private:
+MoveMarkedObjects *_move_ro;
+public:
+MarkAndMoveOrderedReadOnly(MoveMarkedObjects *move_ro) : _move_ro(move_ro) {}
+void do_object(oop obj) {
+if (obj->is_klass() && obj->blueprint()->oop_is_instanceKlass()) {
+instanceKlass* ik = instanceKlass::cast((klassOop)obj);
+int i;
+mark_and_move_for_policy(OP_favor_startup, ik->name(), _move_ro);
+if (ik->super() != NULL) {
+do_object(ik->super());
+}
+objArrayOop interfaces = ik->local_interfaces();
+mark_and_move_for_policy(OP_favor_startup, interfaces, _move_ro);
+for(i = 0; i < interfaces->length(); i++) {
+klassOop k = klassOop(interfaces->obj_at(i));
+mark_and_move_for_policy(OP_favor_startup, k->klass_part()->name(), _move_ro);
+do_object(k);
+}
+objArrayOop methods = ik->methods();
+for(i = 0; i < methods->length(); i++) {
+methodOop m = methodOop(methods->obj_at(i));
+mark_and_move_for_policy(OP_favor_startup, m->constMethod(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, m->constMethod()->exception_table(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, m->constMethod()->stackmap_data(), _move_ro);
+// We don't move the name symbolOop here because it may invalidate
+// method ordering, which is dependent on the address of the name
+// symbolOop.  It will get promoted later with the other symbols.
+// Method name is rarely accessed during classloading anyway.
+// mark_and_move_for_policy(OP_balanced, m->name(), _move_ro);
+mark_and_move_for_policy(OP_favor_startup, m->signature(), _move_ro);
+}
+mark_and_move_for_policy(OP_favor_startup, ik->transitive_interfaces(), _move_ro);
+mark_and_move_for_policy(OP_favor_startup, ik->fields(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->secondary_supers(),  _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->method_ordering(),   _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->class_annotations(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->fields_annotations(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->methods_annotations(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->methods_parameter_annotations(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->methods_default_annotations(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->inner_classes(), _move_ro);
+mark_and_move_for_policy(OP_favor_runtime, ik->secondary_supers(), _move_ro);
+}
+}
+};
+class MarkAndMoveOrderedReadWrite: public ObjectClosure {
+private:
+MoveMarkedObjects *_move_rw;
+public:
+MarkAndMoveOrderedReadWrite(MoveMarkedObjects *move_rw) : _move_rw(move_rw) {}
+void do_object(oop obj) {
+if (obj->is_klass() && obj->blueprint()->oop_is_instanceKlass()) {
+instanceKlass* ik = instanceKlass::cast((klassOop)obj);
+int i;
+mark_and_move_for_policy(OP_favor_startup, ik->as_klassOop(), _move_rw);
+if (ik->super() != NULL) {
+do_object(ik->super());
+}
+objArrayOop interfaces = ik->local_interfaces();
+for(i = 0; i < interfaces->length(); i++) {
+klassOop k = klassOop(interfaces->obj_at(i));
+mark_and_move_for_policy(OP_favor_startup, k, _move_rw);
+do_object(k);
+}
+objArrayOop methods = ik->methods();
+mark_and_move_for_policy(OP_favor_startup, methods, _move_rw);
+for(i = 0; i < methods->length(); i++) {
+methodOop m = methodOop(methods->obj_at(i));
+mark_and_move_for_policy(OP_favor_startup, m, _move_rw);
+mark_and_move_for_policy(OP_favor_startup, ik->constants(), _move_rw);          // idempotent
+mark_and_move_for_policy(OP_balanced, ik->constants()->cache(), _move_rw); // idempotent
+mark_and_move_for_policy(OP_balanced, ik->constants()->tags(), _move_rw);  // idempotent
+}
+mark_and_move_for_policy(OP_favor_startup, ik->as_klassOop()->klass(), _move_rw);
+mark_and_move_for_policy(OP_favor_startup, ik->constants()->klass(), _move_rw);
+// Although Java mirrors are marked in MarkReadWriteObjects,
+// apparently they were never moved into shared spaces since
+// MoveMarkedObjects skips marked instance oops.  This may
+// be a bug in the original implementation or simply the vestige
+// of an abandoned experiment.  Nevertheless we leave a hint
+// here in case this capability is ever correctly implemented.
+//
+// mark_and_move_for_policy(OP_favor_runtime, ik->java_mirror(), _move_rw);
+}
+}
+};
+// Adjust references in oops to refer to shared spaces.
+class ResolveForwardingClosure: public OopClosure {
+public:
+void do_oop(oop* p) {
+oop obj = *p;
+if (!obj->is_shared()) {
+if (obj != NULL) {
+oop f = obj->forwardee();
+guarantee(f->is_shared(), "Oop doesn't refer to shared space.");
+*p = f;
+}
+}
+}
+};
+void sort_methods(instanceKlass* ik, TRAPS) {
+klassOop super = ik->super();
+if (super != NULL) {
+sort_methods(instanceKlass::cast(super), THREAD);
+}
+// The methods array must be ordered by symbolOop address. (See
+// classFileParser.cpp where methods in a class are originally
+// sorted.)  Since objects have just be reordered, this must be
+// corrected.
+methodOopDesc::sort_methods(ik->methods(),
+ik->methods_annotations(),
+ik->methods_parameter_annotations(),
+ik->methods_default_annotations(),
+true /* idempotent, slow */);
+// Itable indices are calculated based on methods array order
+// (see klassItable::compute_itable_index()).  Must reinitialize.
+// We assume that since checkconstraints is false, this method
+// cannot throw an exception.  An exception here would be
+// problematic since this is the VMThread, not a JavaThread.
+ik->itable()->initialize_itable(false, THREAD);
+}
+// Sort methods if the oop is an instanceKlass.
+class SortMethodsClosure: public ObjectClosure {
+private:
+Thread* _thread;
+public:
+SortMethodsClosure(Thread* thread) : _thread(thread) {}
+void do_object(oop obj) {
+// instanceKlass objects need some adjustment.
+if (obj->blueprint()->oop_is_instanceKlass()) {
+instanceKlass* ik = instanceKlass::cast((klassOop)obj);
+sort_methods(ik, _thread);
+}
+}
+};
+// Adjust references in oops to refer to shared spaces.
+class PatchOopsClosure: public ObjectClosure {
+private:
+Thread* _thread;
+ResolveForwardingClosure resolve;
+public:
+PatchOopsClosure(Thread* thread) : _thread(thread) {}
+void do_object(oop obj) {
+obj->oop_iterate_header(&resolve);
+obj->oop_iterate(&resolve);
+assert(obj->klass()->is_shared(), "Klass not pointing into shared space.");
+// If the object is a Java object or class which might (in the
+// future) contain a reference to a young gen object, add it to the
+// list.
+if (obj->is_klass() || obj->is_instance()) {
+if (obj->is_klass() ||
+obj->is_a(SystemDictionary::class_klass()) ||
+obj->is_a(SystemDictionary::throwable_klass())) {
+// Do nothing
+}
+else if (obj->is_a(SystemDictionary::string_klass())) {
+// immutable objects.
+} else {
+// someone added an object we hadn't accounted for.
+ShouldNotReachHere();
+}
+}
+}
+};
+// Empty the young and old generations.
+class ClearSpaceClosure : public SpaceClosure {
+public:
+void do_space(Space* s) {
+s->clear();
+}
+};
+// Closure for serializing initialization data out to a data area to be
+// written to the shared file.
+class WriteClosure : public SerializeOopClosure {
+private:
+oop* top;
+char* end;
+void out_of_space() {
+warning("\nThe shared miscellaneous data space is not large "
+"enough to \npreload requested classes.  Use "
+"-XX:SharedMiscDataSize= to increase \nthe initial "
+"size of the miscellaneous data space.\n");
+exit(2);
+}
+inline void check_space() {
+if ((char*)top + sizeof(oop) > end) {
+out_of_space();
+}
+}
+public:
+WriteClosure(char* md_top, char* md_end) {
+top = (oop*)md_top;
+end = md_end;
+}
+char* get_top() { return (char*)top; }
+void do_oop(oop* p) {
+check_space();
+oop obj = *p;
+assert(obj->is_oop_or_null(), "invalid oop");
+assert(obj == NULL || obj->is_shared(),
+"Oop in shared space not pointing into shared space.");
+*top = obj;
+++top;
+}
+void do_int(int* p) {
+check_space();
+*top = (oop)(intptr_t)*p;
+++top;
+}
+void do_size_t(size_t* p) {
+check_space();
+*top = (oop)(intptr_t)*p;
+++top;
+}
+void do_ptr(void** p) {
+check_space();
+*top = (oop)*p;
+++top;
+}
+void do_ptr(HeapWord** p) { do_ptr((void **) p); }
+void do_tag(int tag) {
+check_space();
+*top = (oop)(intptr_t)tag;
+++top;
+}
+void do_region(u_char* start, size_t size) {
+if ((char*)top + size > end) {
+out_of_space();
+}
+assert((intptr_t)start % sizeof(oop) == 0, "bad alignment");
+assert(size % sizeof(oop) == 0, "bad size");
+do_tag((int)size);
+while (size > 0) {
+*top = *(oop*)start;
+++top;
+start += sizeof(oop);
+size -= sizeof(oop);
+}
+}
+bool reading() const { return false; }
+};
+class ResolveConstantPoolsClosure : public ObjectClosure {
+private:
+TRAPS;
+public:
+ResolveConstantPoolsClosure(Thread *t) {
+__the_thread__ = t;
+}
+void do_object(oop obj) {
+if (obj->is_constantPool()) {
+constantPoolOop cpool = (constantPoolOop)obj;
+int unresolved = cpool->pre_resolve_shared_klasses(THREAD);
+}
+}
+};
+// Print a summary of the contents of the read/write spaces to help
+// identify objects which might be able to be made read-only.  At this
+// point, the objects have been written, and we can trash them as
+// needed.
+static void print_contents() {
+if (PrintSharedSpaces) {
+GenCollectedHeap* gch = GenCollectedHeap::heap();
+CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen();
+// High level summary of the read-only space:
+ClassifyObjectClosure coc;
+tty->cr(); tty->print_cr("ReadOnly space:");
+gen->ro_space()->object_iterate(&coc);
+coc.print();
+// High level summary of the read-write space:
+coc.reset();
+tty->cr(); tty->print_cr("ReadWrite space:");
+gen->rw_space()->object_iterate(&coc);
+coc.print();
+// Reset counters
+ClearAllocCountClosure cacc;
+gen->ro_space()->object_iterate(&cacc);
+gen->rw_space()->object_iterate(&cacc);
+coc.reset();
+// Lower level summary of the read-only space:
+gen->ro_space()->object_iterate(&coc);
+tty->cr(); tty->print_cr("ReadOnly space:");
+ClassifyInstanceKlassClosure cikc;
+gen->rw_space()->object_iterate(&cikc);
+cikc.print();
+// Reset counters
+gen->ro_space()->object_iterate(&cacc);
+gen->rw_space()->object_iterate(&cacc);
+coc.reset();
+// Lower level summary of the read-write space:
+gen->rw_space()->object_iterate(&coc);
+cikc.reset();
+tty->cr();  tty->print_cr("ReadWrite space:");
+gen->rw_space()->object_iterate(&cikc);
+cikc.print();
+}
+}
+// Patch C++ vtable pointer in klass oops.
+// Klass objects contain references to c++ vtables in the JVM library.
+// Fix them to point to our constructed vtables.  However, don't iterate
+// across the space while doing this, as that causes the vtables to be
+// patched, undoing our useful work.  Instead, iterate to make a list,
+// then use the list to do the fixing.
+class PatchKlassVtables: public ObjectClosure {
+private:
+void*         _vtbl_ptr;
+VirtualSpace* _md_vs;
+GrowableArray<klassOop>* _klass_objects;
+public:
+PatchKlassVtables(void* vtbl_ptr, VirtualSpace* md_vs) {
+_vtbl_ptr = vtbl_ptr;
+_md_vs = md_vs;
+_klass_objects = new GrowableArray<klassOop>();
+}
+void do_object(oop obj) {
+if (obj->is_klass()) {
+_klass_objects->append(klassOop(obj));
+}
+}
+void patch(void** vtbl_list, int vtbl_list_size) {
+for (int i = 0; i < _klass_objects->length(); ++i) {
+klassOop obj = (klassOop)_klass_objects->at(i);
+Klass* k = obj->klass_part();
+void* v =  *(void**)k;
+int n;
+for (n = 0; n < vtbl_list_size; ++n) {
+*(void**)k = NULL;
+if (vtbl_list[n] == v) {
+*(void**)k = (void**)_vtbl_ptr +
+(n * CompactingPermGenGen::num_virtuals);
+break;
+}
+}
+guarantee(n < vtbl_list_size, "unable to find matching vtbl pointer");
+}
+}
+};
+// Populate the shared space.
+class VM_PopulateDumpSharedSpace: public VM_Operation {
+private:
+GrowableArray<oop> *_class_promote_order;
+OffsetTableContigSpace* _ro_space;
+OffsetTableContigSpace* _rw_space;
+VirtualSpace* _md_vs;
+VirtualSpace* _mc_vs;
+public:
+VM_PopulateDumpSharedSpace(GrowableArray<oop> *class_promote_order,
+OffsetTableContigSpace* ro_space,
+OffsetTableContigSpace* rw_space,
+VirtualSpace* md_vs, VirtualSpace* mc_vs) {
+_class_promote_order = class_promote_order;
+_ro_space = ro_space;
+_rw_space = rw_space;
+_md_vs = md_vs;
+_mc_vs = mc_vs;
+}
+VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
+void doit() {
+Thread* THREAD = VMThread::vm_thread();
+NOT_PRODUCT(SystemDictionary::verify();)
+// The following guarantee is meant to ensure that no loader constraints
+// exist yet, since the constraints table is not shared.  This becomes
+// more important now that we don't re-initialize vtables/itables for
+// shared classes at runtime, where constraints were previously created.
+guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
+"loader constraints are not saved");
+GenCollectedHeap* gch = GenCollectedHeap::heap();
+// At this point, many classes have been loaded.
+// Update all the fingerprints in the shared methods.
+tty->print("Calculating fingerprints ... ");
+FingerprintMethodsClosure fpmc;
+gch->object_iterate(&fpmc);
+tty->print_cr("done. ");
+// Remove all references outside the heap.
+tty->print("Removing unshareable information ... ");
+RemoveUnshareableInfoClosure ruic;
+gch->object_iterate(&ruic);
+tty->print_cr("done. ");
+// Move the objects in three passes.
+MarkObjectsOopClosure mark_all;
+MarkCommonReadOnly mark_common_ro;
+MarkCommonSymbols mark_common_symbols;
+MarkStringValues mark_string_values;
+MarkReadWriteObjects mark_rw;
+MarkStringObjects mark_strings;
+MoveMarkedObjects move_ro(_ro_space, true);
+MoveMarkedObjects move_rw(_rw_space, false);
+// The SharedOptimizeColdStart VM option governs the new layout
+// algorithm for promoting classes into the shared archive.
+// The general idea is to minimize cold start time by laying
+// out the objects in the order they are accessed at startup time.
+// By doing this we are trying to eliminate out-of-order accesses
+// in the shared archive.  This benefits cold startup time by making
+// disk reads as sequential as possible during class loading and
+// bootstrapping activities.  There may also be a small secondary
+// effect of better "packing" of more commonly used data on a smaller
+// number of pages, although no direct benefit has been measured from
+// this effect.
+//
+// At the class level of granularity, the promotion order is dictated
+// by the classlist file whose generation is discussed elsewhere.
+//
+// At smaller granularity, optimal ordering was determined by an
+// offline analysis of object access order in the shared archive.
+// The dbx watchpoint facility, combined with SA post-processing,
+// was used to observe common access patterns primarily during
+// classloading.  This information was used to craft the promotion
+// order seen in the following closures.
+//
+// The observed access order is mostly governed by what happens
+// in SystemDictionary::load_shared_class().  NOTE WELL - care
+// should be taken when making changes to this method, because it
+// may invalidate assumptions made about access order!
+//
+// (Ideally, there would be a better way to manage changes to
+//  the access order.  Unfortunately a generic in-VM solution for
+//  dynamically observing access order and optimizing shared
+//  archive layout is pretty difficult.  We go with the static
+//  analysis because the code is fairly mature at this point
+//  and we're betting that the access order won't change much.)
+MarkAndMoveOrderedReadOnly  mark_and_move_ordered_ro(&move_ro);
+MarkAndMoveOrderedReadWrite mark_and_move_ordered_rw(&move_rw);
+// Phase 1a: move commonly used read-only objects to the read-only space.
+if (SharedOptimizeColdStart) {
+tty->print("Moving pre-ordered read-only objects to shared space at " PTR_FORMAT " ... ",
+_ro_space->top());
+for (int i = 0; i < _class_promote_order->length(); i++) {
+oop obj = _class_promote_order->at(i);
+mark_and_move_ordered_ro.do_object(obj);
+}
+tty->print_cr("done. ");
+}
+tty->print("Moving read-only objects to shared space at " PTR_FORMAT " ... ",
+_ro_space->top());
+gch->object_iterate(&mark_common_ro);
+gch->object_iterate(&move_ro);
+tty->print_cr("done. ");
+// Phase 1b: move commonly used symbols to the read-only space.
+tty->print("Moving common symbols to shared space at " PTR_FORMAT " ... ",
+_ro_space->top());
+gch->object_iterate(&mark_common_symbols);
+gch->object_iterate(&move_ro);
+tty->print_cr("done. ");
+// Phase 1c: move remaining symbols to the read-only space
+// (e.g. String initializers).
+tty->print("Moving remaining symbols to shared space at " PTR_FORMAT " ... ",
+_ro_space->top());
+vmSymbols::oops_do(&mark_all, true);
+gch->object_iterate(&move_ro);
+tty->print_cr("done. ");
+// Phase 1d: move String character arrays to the read-only space.
+tty->print("Moving string char arrays to shared space at " PTR_FORMAT " ... ",
+_ro_space->top());
+gch->object_iterate(&mark_string_values);
+gch->object_iterate(&move_ro);
+tty->print_cr("done. ");
+// Phase 2: move all remaining symbols to the read-only space.  The
+// remaining symbols are assumed to be string initializers no longer
+// referenced.
+void* extra_symbols = _ro_space->top();
+tty->print("Moving additional symbols to shared space at " PTR_FORMAT " ... ",
+_ro_space->top());
+SymbolTable::oops_do(&mark_all);
+gch->object_iterate(&move_ro);
+tty->print_cr("done. ");
+tty->print_cr("Read-only space ends at " PTR_FORMAT ", %d bytes.",
+_ro_space->top(), _ro_space->used());
+// Phase 3: move read-write objects to the read-write space, except
+// Strings.
+if (SharedOptimizeColdStart) {
+tty->print("Moving pre-ordered read-write objects to shared space at " PTR_FORMAT " ... ",
+_rw_space->top());
+for (int i = 0; i < _class_promote_order->length(); i++) {
+oop obj = _class_promote_order->at(i);
+mark_and_move_ordered_rw.do_object(obj);
+}
+tty->print_cr("done. ");
+}
+tty->print("Moving read-write objects to shared space at " PTR_FORMAT " ... ",
+_rw_space->top());
+Universe::oops_do(&mark_all, true);
+SystemDictionary::oops_do(&mark_all);
+oop tmp = Universe::arithmetic_exception_instance();
+mark_object(java_lang_Throwable::message(tmp));
+gch->object_iterate(&mark_rw);
+gch->object_iterate(&move_rw);
+tty->print_cr("done. ");
+// Phase 4: move String objects to the read-write space.
+tty->print("Moving String objects to shared space at " PTR_FORMAT " ... ",
+_rw_space->top());
+StringTable::oops_do(&mark_all);
+gch->object_iterate(&mark_strings);
+gch->object_iterate(&move_rw);
+tty->print_cr("done. ");
+tty->print_cr("Read-write space ends at " PTR_FORMAT ", %d bytes.",
+_rw_space->top(), _rw_space->used());
+#ifdef DEBUG
+// Check: scan for objects which were not moved.
+CheckRemainingObjects check_objects;
+gch->object_iterate(&check_objects);
+check_objects.status();
+#endif
+// Resolve forwarding in objects and saved C++ structures
+tty->print("Updating references to shared objects ... ");
+ResolveForwardingClosure resolve;
+Universe::oops_do(&resolve);
+SystemDictionary::oops_do(&resolve);
+StringTable::oops_do(&resolve);
+SymbolTable::oops_do(&resolve);
+vmSymbols::oops_do(&resolve);
+// Set up the share data and shared code segments.
+char* md_top = _md_vs->low();
+char* md_end = _md_vs->high();
+char* mc_top = _mc_vs->low();
+char* mc_end = _mc_vs->high();
+// Reserve space for the list of klassOops whose vtables are used
+// for patching others as needed.
+void** vtbl_list = (void**)md_top;
+int vtbl_list_size = CompactingPermGenGen::vtbl_list_size;
+Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size);
+md_top += vtbl_list_size * sizeof(void*);
+void* vtable = md_top;
+// Reserve space for a new dummy vtable for klass objects in the
+// heap.  Generate self-patching vtable entries.
+CompactingPermGenGen::generate_vtable_methods(vtbl_list,
+&vtable,
+&md_top, md_end,
+&mc_top, mc_end);
+// Fix (forward) all of the references in these shared objects (which
+// are required to point ONLY to objects in the shared spaces).
+// Also, create a list of all objects which might later contain a
+// reference to a younger generation object.
+CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen();
+PatchOopsClosure patch(THREAD);
+gen->ro_space()->object_iterate(&patch);
+gen->rw_space()->object_iterate(&patch);
+// Previously method sorting was done concurrently with forwarding
+// pointer resolution in the shared spaces.  This imposed an ordering
+// restriction in that methods were required to be promoted/patched
+// before their holder classes.  (Because constant pool pointers in
+// methodKlasses are required to be resolved before their holder class
+// is visited for sorting, otherwise methods are sorted by incorrect,
+// pre-forwarding addresses.)
+//
+// Now, we reorder methods as a separate step after ALL forwarding
+// pointer resolution, so that methods can be promoted in any order
+// with respect to their holder classes.
+SortMethodsClosure sort(THREAD);
+gen->ro_space()->object_iterate(&sort);
+gen->rw_space()->object_iterate(&sort);
+tty->print_cr("done. ");
+tty->cr();
+// Reorder the system dictionary.  (Moving the symbols opps affects
+// how the hash table indices are calculated.)
+SystemDictionary::reorder_dictionary();
+// Empty the non-shared heap (because most of the objects were
+// copied out, and the remainder cannot be considered valid oops).
+ClearSpaceClosure csc;
+for (int i = 0; i < gch->n_gens(); ++i) {
+gch->get_gen(i)->space_iterate(&csc);
+}
+csc.do_space(gen->the_space());
+NOT_PRODUCT(SystemDictionary::verify();)
+// Copy the String table, the symbol table, and the system
+// dictionary to the shared space in usable form.  Copy the hastable
+// buckets first [read-write], then copy the linked lists of entries
+// [read-only].
+SymbolTable::reverse(extra_symbols);
+NOT_PRODUCT(SymbolTable::verify());
+SymbolTable::copy_buckets(&md_top, md_end);
+StringTable::reverse();
+NOT_PRODUCT(StringTable::verify());
+StringTable::copy_buckets(&md_top, md_end);
+SystemDictionary::reverse();
+SystemDictionary::copy_buckets(&md_top, md_end);
+ClassLoader::verify();
+ClassLoader::copy_package_info_buckets(&md_top, md_end);
+ClassLoader::verify();
+SymbolTable::copy_table(&md_top, md_end);
+StringTable::copy_table(&md_top, md_end);
+SystemDictionary::copy_table(&md_top, md_end);
+ClassLoader::verify();
+ClassLoader::copy_package_info_table(&md_top, md_end);
+ClassLoader::verify();
+// Print debug data.
+if (PrintSharedSpaces) {
+const char* fmt = "%s space: " PTR_FORMAT " out of " PTR_FORMAT " bytes allocated at " PTR_FORMAT ".";
+tty->print_cr(fmt, "ro", _ro_space->used(), _ro_space->capacity(),
+_ro_space->bottom());
+tty->print_cr(fmt, "rw", _rw_space->used(), _rw_space->capacity(),
+_rw_space->bottom());
+}
+// Write the oop data to the output array.
+WriteClosure wc(md_top, md_end);
+CompactingPermGenGen::serialize_oops(&wc);
+md_top = wc.get_top();
+// Update the vtable pointers in all of the Klass objects in the
+// heap. They should point to newly generated vtable.
+PatchKlassVtables pkvt(vtable, _md_vs);
+_rw_space->object_iterate(&pkvt);
+pkvt.patch(vtbl_list, vtbl_list_size);
+char* saved_vtbl = (char*)malloc(vtbl_list_size * sizeof(void*));
+memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*));
+memset(vtbl_list, 0, vtbl_list_size * sizeof(void*));
+// Create and write the archive file that maps the shared spaces.
+FileMapInfo* mapinfo = new FileMapInfo();
+mapinfo->populate_header(gch->gen_policy()->max_alignment());
+// Pass 1 - update file offsets in header.
+mapinfo->write_header();
+mapinfo->write_space(CompactingPermGenGen::ro, _ro_space, true);
+_ro_space->set_saved_mark();
+mapinfo->write_space(CompactingPermGenGen::rw, _rw_space, false);
+_rw_space->set_saved_mark();
+mapinfo->write_region(CompactingPermGenGen::md, _md_vs->low(),
+md_top - _md_vs->low(), SharedMiscDataSize,
+false, false);
+mapinfo->write_region(CompactingPermGenGen::mc, _mc_vs->low(),
+mc_top - _mc_vs->low(), SharedMiscCodeSize,
+true, true);
+// Pass 2 - write data.
+mapinfo->open_for_write();
+mapinfo->write_header();
+mapinfo->write_space(CompactingPermGenGen::ro, _ro_space, true);
+mapinfo->write_space(CompactingPermGenGen::rw, _rw_space, false);
+mapinfo->write_region(CompactingPermGenGen::md, _md_vs->low(),
+md_top - _md_vs->low(), SharedMiscDataSize,
+false, false);
+mapinfo->write_region(CompactingPermGenGen::mc, _mc_vs->low(),
+mc_top - _mc_vs->low(), SharedMiscCodeSize,
+true, true);
+mapinfo->close();
+// Summarize heap.
+memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*));
+print_contents();
+}
+}; // class VM_PopulateDumpSharedSpace
+// Populate the shared spaces and dump to a file.
+jint CompactingPermGenGen::dump_shared(GrowableArray<oop>* class_promote_order, TRAPS) {
+GenCollectedHeap* gch = GenCollectedHeap::heap();
+// Calculate hash values for all of the (interned) strings to avoid
+// writes to shared pages in the future.
+tty->print("Calculating hash values for String objects .. ");
+StringHashCodeClosure shcc(THREAD);
+StringTable::oops_do(&shcc);
+tty->print_cr("done. ");
+CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen();
+VM_PopulateDumpSharedSpace op(class_promote_order,
+gen->ro_space(), gen->rw_space(),
+gen->md_space(), gen->mc_space());
+VMThread::execute(&op);
+return JNI_OK;
+}
+class LinkClassesClosure : public ObjectClosure {
+private:
+Thread* THREAD;
+public:
+LinkClassesClosure(Thread* thread) : THREAD(thread) {}
+void do_object(oop obj) {
+if (obj->is_klass()) {
+Klass* k = Klass::cast((klassOop) obj);
+if (k->oop_is_instance()) {
+instanceKlass* ik = (instanceKlass*) k;
+// Link the class to cause the bytecodes to be rewritten and the
+// cpcache to be created.
+if (ik->get_init_state() < instanceKlass::linked) {
+ik->link_class(THREAD);
+guarantee(!HAS_PENDING_EXCEPTION, "exception in class rewriting");
+}
+// Create String objects from string initializer symbols.
+ik->constants()->resolve_string_constants(THREAD);
+guarantee(!HAS_PENDING_EXCEPTION, "exception resolving string constants");
+}
+}
+}
+};
+// Support for a simple checksum of the contents of the class list
+// file to prevent trivial tampering. The algorithm matches that in
+// the MakeClassList program used by the J2SE build process.
+#define JSUM_SEED ((jlong)CONST64(0xcafebabebabecafe))
+static jlong
+jsum(jlong start, const char *buf, const int len)
+{
+jlong h = start;
+char *p = (char *)buf, *e = p + len;
+while (p < e) {
+char c = *p++;
+if (c <= ' ') {
+/* Skip spaces and control characters */
+continue;
+}
+h = 31 * h + c;
+}
+return h;
+}
+// Preload classes from a list, populate the shared spaces and dump to a
+// file.
+void GenCollectedHeap::preload_and_dump(TRAPS) {
+TraceTime timer("Dump Shared Spaces", TraceStartupTime);
+ResourceMark rm;
+// Preload classes to be shared.
+// Should use some hpi:: method rather than fopen() here. aB.
+// Construct the path to the class list (in jre/lib)
+// Walk up two directories from the location of the VM and
+// optionally tack on "lib" (depending on platform)
+char class_list_path[JVM_MAXPATHLEN];
+os::jvm_path(class_list_path, sizeof(class_list_path));
+for (int i = 0; i < 3; i++) {
+char *end = strrchr(class_list_path, *os::file_separator());
+if (end != NULL) *end = '\0';
+}
+int class_list_path_len = (int)strlen(class_list_path);
+if (class_list_path_len >= 3) {
+if (strcmp(class_list_path + class_list_path_len - 3, "lib") != 0) {
+strcat(class_list_path, os::file_separator());
+strcat(class_list_path, "lib");
+}
+}
+strcat(class_list_path, os::file_separator());
+strcat(class_list_path, "classlist");
+FILE* file = fopen(class_list_path, "r");
+if (file != NULL) {
+jlong computed_jsum  = JSUM_SEED;
+jlong file_jsum      = 0;
+char class_name[256];
+int class_count = 0;
+GenCollectedHeap* gch = GenCollectedHeap::heap();
+gch->_preloading_shared_classes = true;
+GrowableArray<oop>* class_promote_order = new GrowableArray<oop>();
+// Preload (and intern) strings which will be used later.
+StringTable::intern("main", THREAD);
+StringTable::intern("([Ljava/lang/String;)V", THREAD);
+StringTable::intern("Ljava/lang/Class;", THREAD);
+StringTable::intern("I", THREAD);   // Needed for StringBuffer persistence?
+StringTable::intern("Z", THREAD);   // Needed for StringBuffer persistence?
+// sun.io.Converters
+static const char obj_array_sig[] = "[[Ljava/lang/Object;";
+SymbolTable::lookup(obj_array_sig, (int)strlen(obj_array_sig), THREAD);
+// java.util.HashMap
+static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
+SymbolTable::lookup(map_entry_array_sig, (int)strlen(map_entry_array_sig),
+THREAD);
+tty->print("Loading classes to share ... ");
+while ((fgets(class_name, sizeof class_name, file)) != NULL) {
+if (*class_name == '#') {
+jint fsh, fsl;
+if (sscanf(class_name, "# %8x%8x\n", &fsh, &fsl) == 2) {
+file_jsum = ((jlong)(fsh) << 32) | (fsl & 0xffffffff);
+}
+continue;
+}
+// Remove trailing newline
+size_t name_len = strlen(class_name);
+class_name[name_len-1] = '\0';
+computed_jsum = jsum(computed_jsum, class_name, (const int)name_len - 1);
+// Got a class name - load it.
+symbolHandle class_name_symbol = oopFactory::new_symbol(class_name,
+THREAD);
+guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol.");
+klassOop klass = SystemDictionary::resolve_or_null(class_name_symbol,
+THREAD);
+guarantee(!HAS_PENDING_EXCEPTION, "Exception resolving a class.");
+if (klass != NULL) {
+if (PrintSharedSpaces) {
+tty->print_cr("Shared spaces preloaded: %s", class_name);
+}
+instanceKlass* ik = instanceKlass::cast(klass);
+// Should be class load order as per -XX:+TraceClassLoadingPreorder
+class_promote_order->append(ik->as_klassOop());
+// Link the class to cause the bytecodes to be rewritten and the
+// cpcache to be created. The linking is done as soon as classes
+// are loaded in order that the related data structures (klass,
+// cpCache, Sting constants) are located together.
+if (ik->get_init_state() < instanceKlass::linked) {
+ik->link_class(THREAD);
+guarantee(!(HAS_PENDING_EXCEPTION), "exception in class rewriting");
+}
+// Create String objects from string initializer symbols.
+ik->constants()->resolve_string_constants(THREAD);
+class_count++;
+} else {
+if (PrintSharedSpaces) {
+tty->cr();
+tty->print_cr(" Preload failed: %s", class_name);
+}
+}
+file_jsum = 0; // Checksum must be on last line of file
+}
+if (computed_jsum != file_jsum) {
+tty->cr();
+tty->print_cr("Preload failed: checksum of class list was incorrect.");
+exit(1);
+}
+tty->print_cr("done. ");
+if (PrintSharedSpaces) {
+tty->print_cr("Shared spaces: preloaded %d classes", class_count);
+}
+// Rewrite and unlink classes.
+tty->print("Rewriting and unlinking classes ... ");
+// Make heap parsable
+ensure_parsability(false); // arg is actually don't care
+// Link any classes which got missed.  (It's not quite clear why
+// they got missed.)  This iteration would be unsafe if we weren't
+// single-threaded at this point; however we can't do it on the VM
+// thread because it requires object allocation.
+LinkClassesClosure lcc(Thread::current());
+object_iterate(&lcc);
+tty->print_cr("done. ");
+// Create and dump the shared spaces.
+jint err = CompactingPermGenGen::dump_shared(class_promote_order, THREAD);
+if (err != JNI_OK) {
+fatal("Dumping shared spaces failed.");
+}
+} else {
+char errmsg[JVM_MAXPATHLEN];
+hpi::lasterror(errmsg, JVM_MAXPATHLEN);
+tty->print_cr("Loading classlist failed: %s", errmsg);
+exit(1);
+}
+// Since various initialization steps have been undone by this process,
+// it is not reasonable to continue running a java process.
+exit(0);
+}

Mercurial > hg > graal-compiler

comparison src/share/vm/memory/dump.cpp @ 0:a61af66fc99e jdk7-b24