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openjdk/src/hotspot/share/cds/archiveBuilder.cpp
Igor Veresov e3f85c961b 8355003: Implement JEP 515: Ahead-of-Time Method Profiling 
Co-authored-by: John R Rose <jrose@openjdk.org>
Co-authored-by: Vladimir Ivanov <vlivanov@openjdk.org>
Co-authored-by: Ioi Lam <iklam@openjdk.org>
Co-authored-by: Vladimir Kozlov <kvn@openjdk.org>
Co-authored-by: Aleksey Shipilev <shade@openjdk.org>
Reviewed-by: kvn, ihse, cjplummer, iklam
2025-05-28 15:15:03 +00:00

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/*
* Copyright (c) 2020, 2025, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "cds/aotArtifactFinder.hpp"
#include "cds/aotClassLinker.hpp"
#include "cds/aotLinkedClassBulkLoader.hpp"
#include "cds/aotLogging.hpp"
#include "cds/archiveBuilder.hpp"
#include "cds/archiveHeapWriter.hpp"
#include "cds/archiveUtils.hpp"
#include "cds/cdsConfig.hpp"
#include "cds/cppVtables.hpp"
#include "cds/dumpAllocStats.hpp"
#include "cds/dynamicArchive.hpp"
#include "cds/heapShared.hpp"
#include "cds/metaspaceShared.hpp"
#include "cds/regeneratedClasses.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderDataShared.hpp"
#include "classfile/classLoaderExt.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionaryShared.hpp"
#include "classfile/vmClasses.hpp"
#include "code/aotCodeCache.hpp"
#include "interpreter/abstractInterpreter.hpp"
#include "jvm.h"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allStatic.hpp"
#include "memory/memoryReserver.hpp"
#include "memory/memRegion.hpp"
#include "memory/resourceArea.hpp"
#include "oops/compressedKlass.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/methodCounters.hpp"
#include "oops/methodData.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oopHandle.inline.hpp"
#include "oops/trainingData.hpp"
#include "runtime/arguments.hpp"
#include "runtime/fieldDescriptor.inline.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/sharedRuntime.hpp"
#include "utilities/align.hpp"
#include "utilities/bitMap.inline.hpp"
#include "utilities/formatBuffer.hpp"
ArchiveBuilder* ArchiveBuilder::_current = nullptr;
ArchiveBuilder::OtherROAllocMark::~OtherROAllocMark() {
char* newtop = ArchiveBuilder::current()->_ro_region.top();
ArchiveBuilder::alloc_stats()->record_other_type(int(newtop - _oldtop), true);
}
ArchiveBuilder::SourceObjList::SourceObjList() : _ptrmap(16 * K, mtClassShared) {
_total_bytes = 0;
_objs = new (mtClassShared) GrowableArray<SourceObjInfo*>(128 * K, mtClassShared);
}
ArchiveBuilder::SourceObjList::~SourceObjList() {
delete _objs;
}
void ArchiveBuilder::SourceObjList::append(SourceObjInfo* src_info) {
// Save this source object for copying
src_info->set_id(_objs->length());
_objs->append(src_info);
// Prepare for marking the pointers in this source object
assert(is_aligned(_total_bytes, sizeof(address)), "must be");
src_info->set_ptrmap_start(_total_bytes / sizeof(address));
_total_bytes = align_up(_total_bytes + (uintx)src_info->size_in_bytes(), sizeof(address));
src_info->set_ptrmap_end(_total_bytes / sizeof(address));
BitMap::idx_t bitmap_size_needed = BitMap::idx_t(src_info->ptrmap_end());
if (_ptrmap.size() <= bitmap_size_needed) {
_ptrmap.resize((bitmap_size_needed + 1) * 2);
}
}
void ArchiveBuilder::SourceObjList::remember_embedded_pointer(SourceObjInfo* src_info, MetaspaceClosure::Ref* ref) {
// src_obj contains a pointer. Remember the location of this pointer in _ptrmap,
// so that we can copy/relocate it later.
src_info->set_has_embedded_pointer();
address src_obj = src_info->source_addr();
address* field_addr = ref->addr();
assert(src_info->ptrmap_start() < _total_bytes, "sanity");
assert(src_info->ptrmap_end() <= _total_bytes, "sanity");
assert(*field_addr != nullptr, "should have checked");
intx field_offset_in_bytes = ((address)field_addr) - src_obj;
DEBUG_ONLY(int src_obj_size = src_info->size_in_bytes();)
assert(field_offset_in_bytes >= 0, "must be");
assert(field_offset_in_bytes + intx(sizeof(intptr_t)) <= intx(src_obj_size), "must be");
assert(is_aligned(field_offset_in_bytes, sizeof(address)), "must be");
BitMap::idx_t idx = BitMap::idx_t(src_info->ptrmap_start() + (uintx)(field_offset_in_bytes / sizeof(address)));
_ptrmap.set_bit(BitMap::idx_t(idx));
}
class RelocateEmbeddedPointers : public BitMapClosure {
ArchiveBuilder* _builder;
address _buffered_obj;
BitMap::idx_t _start_idx;
public:
RelocateEmbeddedPointers(ArchiveBuilder* builder, address buffered_obj, BitMap::idx_t start_idx) :
_builder(builder), _buffered_obj(buffered_obj), _start_idx(start_idx) {}
bool do_bit(BitMap::idx_t bit_offset) {
size_t field_offset = size_t(bit_offset - _start_idx) * sizeof(address);
address* ptr_loc = (address*)(_buffered_obj + field_offset);
address old_p_with_tags = *ptr_loc;
assert(old_p_with_tags != nullptr, "null ptrs shouldn't have been marked");
address old_p = MetaspaceClosure::strip_tags(old_p_with_tags);
uintx tags = MetaspaceClosure::decode_tags(old_p_with_tags);
address new_p = _builder->get_buffered_addr(old_p);
bool nulled;
if (new_p == nullptr) {
// old_p had a FollowMode of set_to_null
nulled = true;
} else {
new_p = MetaspaceClosure::add_tags(new_p, tags);
nulled = false;
}
log_trace(aot)("Ref: [" PTR_FORMAT "] -> " PTR_FORMAT " => " PTR_FORMAT " %zu",
p2i(ptr_loc), p2i(old_p) + tags, p2i(new_p), tags);
ArchivePtrMarker::set_and_mark_pointer(ptr_loc, new_p);
ArchiveBuilder::current()->count_relocated_pointer(tags != 0, nulled);
return true; // keep iterating the bitmap
}
};
void ArchiveBuilder::SourceObjList::relocate(int i, ArchiveBuilder* builder) {
SourceObjInfo* src_info = objs()->at(i);
assert(src_info->should_copy(), "must be");
BitMap::idx_t start = BitMap::idx_t(src_info->ptrmap_start()); // inclusive
BitMap::idx_t end = BitMap::idx_t(src_info->ptrmap_end()); // exclusive
RelocateEmbeddedPointers relocator(builder, src_info->buffered_addr(), start);
_ptrmap.iterate(&relocator, start, end);
}
ArchiveBuilder::ArchiveBuilder() :
_current_dump_region(nullptr),
_buffer_bottom(nullptr),
_requested_static_archive_bottom(nullptr),
_requested_static_archive_top(nullptr),
_requested_dynamic_archive_bottom(nullptr),
_requested_dynamic_archive_top(nullptr),
_mapped_static_archive_bottom(nullptr),
_mapped_static_archive_top(nullptr),
_buffer_to_requested_delta(0),
_pz_region("pz", MAX_SHARED_DELTA), // protection zone -- used only during dumping; does NOT exist in cds archive.
_rw_region("rw", MAX_SHARED_DELTA),
_ro_region("ro", MAX_SHARED_DELTA),
_ac_region("ac", MAX_SHARED_DELTA),
_ptrmap(mtClassShared),
_rw_ptrmap(mtClassShared),
_ro_ptrmap(mtClassShared),
_rw_src_objs(),
_ro_src_objs(),
_src_obj_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
_buffered_to_src_table(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE),
_total_heap_region_size(0)
{
_klasses = new (mtClassShared) GrowableArray<Klass*>(4 * K, mtClassShared);
_symbols = new (mtClassShared) GrowableArray<Symbol*>(256 * K, mtClassShared);
_entropy_seed = 0x12345678;
_relocated_ptr_info._num_ptrs = 0;
_relocated_ptr_info._num_tagged_ptrs = 0;
_relocated_ptr_info._num_nulled_ptrs = 0;
assert(_current == nullptr, "must be");
_current = this;
}
ArchiveBuilder::~ArchiveBuilder() {
assert(_current == this, "must be");
_current = nullptr;
for (int i = 0; i < _symbols->length(); i++) {
_symbols->at(i)->decrement_refcount();
}
delete _klasses;
delete _symbols;
if (_shared_rs.is_reserved()) {
MemoryReserver::release(_shared_rs);
}
AOTArtifactFinder::dispose();
}
// Returns a deterministic sequence of pseudo random numbers. The main purpose is NOT
// for randomness but to get good entropy for the identity_hash() of archived Symbols,
// while keeping the contents of static CDS archives deterministic to ensure
// reproducibility of JDK builds.
int ArchiveBuilder::entropy() {
assert(SafepointSynchronize::is_at_safepoint(), "needed to ensure deterministic sequence");
_entropy_seed = os::next_random(_entropy_seed);
return static_cast<int>(_entropy_seed);
}
class GatherKlassesAndSymbols : public UniqueMetaspaceClosure {
ArchiveBuilder* _builder;
public:
GatherKlassesAndSymbols(ArchiveBuilder* builder) : _builder(builder) {}
virtual bool do_unique_ref(Ref* ref, bool read_only) {
return _builder->gather_klass_and_symbol(ref, read_only);
}
};
bool ArchiveBuilder::gather_klass_and_symbol(MetaspaceClosure::Ref* ref, bool read_only) {
if (ref->obj() == nullptr) {
return false;
}
if (get_follow_mode(ref) != make_a_copy) {
return false;
}
if (ref->msotype() == MetaspaceObj::ClassType) {
Klass* klass = (Klass*)ref->obj();
assert(klass->is_klass(), "must be");
if (!is_excluded(klass)) {
_klasses->append(klass);
if (klass->is_hidden()) {
assert(klass->is_instance_klass(), "must be");
}
}
} else if (ref->msotype() == MetaspaceObj::SymbolType) {
// Make sure the symbol won't be GC'ed while we are dumping the archive.
Symbol* sym = (Symbol*)ref->obj();
sym->increment_refcount();
_symbols->append(sym);
}
return true; // recurse
}
void ArchiveBuilder::gather_klasses_and_symbols() {
ResourceMark rm;
AOTArtifactFinder::initialize();
AOTArtifactFinder::find_artifacts();
aot_log_info(aot)("Gathering classes and symbols ... ");
GatherKlassesAndSymbols doit(this);
iterate_roots(&doit);
#if INCLUDE_CDS_JAVA_HEAP
if (CDSConfig::is_dumping_full_module_graph()) {
ClassLoaderDataShared::iterate_symbols(&doit);
}
#endif
doit.finish();
if (CDSConfig::is_dumping_static_archive()) {
// To ensure deterministic contents in the static archive, we need to ensure that
// we iterate the MetaspaceObjs in a deterministic order. It doesn't matter where
// the MetaspaceObjs are located originally, as they are copied sequentially into
// the archive during the iteration.
//
// The only issue here is that the symbol table and the system directories may be
// randomly ordered, so we copy the symbols and klasses into two arrays and sort
// them deterministically.
//
// During -Xshare:dump, the order of Symbol creation is strictly determined by
// the SharedClassListFile (class loading is done in a single thread and the JIT
// is disabled). Also, Symbols are allocated in monotonically increasing addresses
// (see Symbol::operator new(size_t, int)). So if we iterate the Symbols by
// ascending address order, we ensure that all Symbols are copied into deterministic
// locations in the archive.
//
// TODO: in the future, if we want to produce deterministic contents in the
// dynamic archive, we might need to sort the symbols alphabetically (also see
// DynamicArchiveBuilder::sort_methods()).
aot_log_info(aot)("Sorting symbols ... ");
_symbols->sort(compare_symbols_by_address);
sort_klasses();
}
AOTClassLinker::add_candidates();
}
int ArchiveBuilder::compare_symbols_by_address(Symbol** a, Symbol** b) {
if (a[0] < b[0]) {
return -1;
} else {
assert(a[0] > b[0], "Duplicated symbol %s unexpected", (*a)->as_C_string());
return 1;
}
}
int ArchiveBuilder::compare_klass_by_name(Klass** a, Klass** b) {
return a[0]->name()->fast_compare(b[0]->name());
}
void ArchiveBuilder::sort_klasses() {
aot_log_info(aot)("Sorting classes ... ");
_klasses->sort(compare_klass_by_name);
}
address ArchiveBuilder::reserve_buffer() {
// AOTCodeCache::max_aot_code_size() accounts for aot code region.
size_t buffer_size = LP64_ONLY(CompressedClassSpaceSize) NOT_LP64(256 * M) + AOTCodeCache::max_aot_code_size();
ReservedSpace rs = MemoryReserver::reserve(buffer_size,
MetaspaceShared::core_region_alignment(),
os::vm_page_size(),
mtNone);
if (!rs.is_reserved()) {
aot_log_error(aot)("Failed to reserve %zu bytes of output buffer.", buffer_size);
MetaspaceShared::unrecoverable_writing_error();
}
// buffer_bottom is the lowest address of the 2 core regions (rw, ro) when
// we are copying the class metadata into the buffer.
address buffer_bottom = (address)rs.base();
aot_log_info(aot)("Reserved output buffer space at " PTR_FORMAT " [%zu bytes]",
p2i(buffer_bottom), buffer_size);
_shared_rs = rs;
_buffer_bottom = buffer_bottom;
if (CDSConfig::is_dumping_static_archive()) {
_current_dump_region = &_pz_region;
} else {
_current_dump_region = &_rw_region;
}
_current_dump_region->init(&_shared_rs, &_shared_vs);
ArchivePtrMarker::initialize(&_ptrmap, &_shared_vs);
// The bottom of the static archive should be mapped at this address by default.
_requested_static_archive_bottom = (address)MetaspaceShared::requested_base_address();
// The bottom of the archive (that I am writing now) should be mapped at this address by default.
address my_archive_requested_bottom;
if (CDSConfig::is_dumping_static_archive()) {
my_archive_requested_bottom = _requested_static_archive_bottom;
} else {
_mapped_static_archive_bottom = (address)MetaspaceObj::shared_metaspace_base();
_mapped_static_archive_top = (address)MetaspaceObj::shared_metaspace_top();
assert(_mapped_static_archive_top >= _mapped_static_archive_bottom, "must be");
size_t static_archive_size = _mapped_static_archive_top - _mapped_static_archive_bottom;
// At run time, we will mmap the dynamic archive at my_archive_requested_bottom
_requested_static_archive_top = _requested_static_archive_bottom + static_archive_size;
my_archive_requested_bottom = align_up(_requested_static_archive_top, MetaspaceShared::core_region_alignment());
_requested_dynamic_archive_bottom = my_archive_requested_bottom;
}
_buffer_to_requested_delta = my_archive_requested_bottom - _buffer_bottom;
address my_archive_requested_top = my_archive_requested_bottom + buffer_size;
if (my_archive_requested_bottom < _requested_static_archive_bottom ||
my_archive_requested_top <= _requested_static_archive_bottom) {
// Size overflow.
aot_log_error(aot)("my_archive_requested_bottom = " INTPTR_FORMAT, p2i(my_archive_requested_bottom));
aot_log_error(aot)("my_archive_requested_top = " INTPTR_FORMAT, p2i(my_archive_requested_top));
aot_log_error(aot)("SharedBaseAddress (" INTPTR_FORMAT ") is too high. "
"Please rerun java -Xshare:dump with a lower value", p2i(_requested_static_archive_bottom));
MetaspaceShared::unrecoverable_writing_error();
}
if (CDSConfig::is_dumping_static_archive()) {
// We don't want any valid object to be at the very bottom of the archive.
// See ArchivePtrMarker::mark_pointer().
_pz_region.allocate(MetaspaceShared::protection_zone_size());
start_dump_region(&_rw_region);
}
return buffer_bottom;
}
void ArchiveBuilder::iterate_sorted_roots(MetaspaceClosure* it) {
int num_symbols = _symbols->length();
for (int i = 0; i < num_symbols; i++) {
it->push(_symbols->adr_at(i));
}
int num_klasses = _klasses->length();
for (int i = 0; i < num_klasses; i++) {
it->push(_klasses->adr_at(i));
}
iterate_roots(it);
}
class GatherSortedSourceObjs : public MetaspaceClosure {
ArchiveBuilder* _builder;
public:
GatherSortedSourceObjs(ArchiveBuilder* builder) : _builder(builder) {}
virtual bool do_ref(Ref* ref, bool read_only) {
return _builder->gather_one_source_obj(ref, read_only);
}
};
bool ArchiveBuilder::gather_one_source_obj(MetaspaceClosure::Ref* ref, bool read_only) {
address src_obj = ref->obj();
if (src_obj == nullptr) {
return false;
}
remember_embedded_pointer_in_enclosing_obj(ref);
if (RegeneratedClasses::has_been_regenerated(src_obj)) {
// No need to copy it. We will later relocate it to point to the regenerated klass/method.
return false;
}
FollowMode follow_mode = get_follow_mode(ref);
SourceObjInfo src_info(ref, read_only, follow_mode);
bool created;
SourceObjInfo* p = _src_obj_table.put_if_absent(src_obj, src_info, &created);
if (created) {
if (_src_obj_table.maybe_grow()) {
log_info(aot, hashtables)("Expanded _src_obj_table table to %d", _src_obj_table.table_size());
}
}
#ifdef ASSERT
if (ref->msotype() == MetaspaceObj::MethodType) {
Method* m = (Method*)ref->obj();
assert(!RegeneratedClasses::has_been_regenerated((address)m->method_holder()),
"Should not archive methods in a class that has been regenerated");
}
#endif
if (ref->msotype() == MetaspaceObj::MethodDataType) {
MethodData* md = (MethodData*)ref->obj();
md->clean_method_data(false /* always_clean */);
}
assert(p->read_only() == src_info.read_only(), "must be");
if (created && src_info.should_copy()) {
if (read_only) {
_ro_src_objs.append(p);
} else {
_rw_src_objs.append(p);
}
return true; // Need to recurse into this ref only if we are copying it
} else {
return false;
}
}
void ArchiveBuilder::record_regenerated_object(address orig_src_obj, address regen_src_obj) {
// Record the fact that orig_src_obj has been replaced by regen_src_obj. All calls to get_buffered_addr(orig_src_obj)
// should return the same value as get_buffered_addr(regen_src_obj).
SourceObjInfo* p = _src_obj_table.get(regen_src_obj);
assert(p != nullptr, "regenerated object should always be dumped");
SourceObjInfo orig_src_info(orig_src_obj, p);
bool created;
_src_obj_table.put_if_absent(orig_src_obj, orig_src_info, &created);
assert(created, "We shouldn't have archived the original copy of a regenerated object");
}
// Remember that we have a pointer inside ref->enclosing_obj() that points to ref->obj()
void ArchiveBuilder::remember_embedded_pointer_in_enclosing_obj(MetaspaceClosure::Ref* ref) {
assert(ref->obj() != nullptr, "should have checked");
address enclosing_obj = ref->enclosing_obj();
if (enclosing_obj == nullptr) {
return;
}
// We are dealing with 3 addresses:
// address o = ref->obj(): We have found an object whose address is o.
// address* mpp = ref->mpp(): The object o is pointed to by a pointer whose address is mpp.
// I.e., (*mpp == o)
// enclosing_obj : If non-null, it is the object which has a field that points to o.
// mpp is the address if that field.
//
// Example: We have an array whose first element points to a Method:
// Method* o = 0x0000abcd;
// Array<Method*>* enclosing_obj = 0x00001000;
// enclosing_obj->at_put(0, o);
//
// We the MetaspaceClosure iterates on the very first element of this array, we have
// ref->obj() == 0x0000abcd (the Method)
// ref->mpp() == 0x00001008 (the location of the first element in the array)
// ref->enclosing_obj() == 0x00001000 (the Array that contains the Method)
//
// We use the above information to mark the bitmap to indicate that there's a pointer on address 0x00001008.
SourceObjInfo* src_info = _src_obj_table.get(enclosing_obj);
if (src_info == nullptr || !src_info->should_copy()) {
// source objects of point_to_it/set_to_null types are not copied
// so we don't need to remember their pointers.
} else {
if (src_info->read_only()) {
_ro_src_objs.remember_embedded_pointer(src_info, ref);
} else {
_rw_src_objs.remember_embedded_pointer(src_info, ref);
}
}
}
void ArchiveBuilder::gather_source_objs() {
ResourceMark rm;
aot_log_info(aot)("Gathering all archivable objects ... ");
gather_klasses_and_symbols();
GatherSortedSourceObjs doit(this);
iterate_sorted_roots(&doit);
doit.finish();
}
bool ArchiveBuilder::is_excluded(Klass* klass) {
if (klass->is_instance_klass()) {
InstanceKlass* ik = InstanceKlass::cast(klass);
return SystemDictionaryShared::is_excluded_class(ik);
} else if (klass->is_objArray_klass()) {
Klass* bottom = ObjArrayKlass::cast(klass)->bottom_klass();
if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_shared_static(bottom)) {
// The bottom class is in the static archive so it's clearly not excluded.
return false;
} else if (bottom->is_instance_klass()) {
return SystemDictionaryShared::is_excluded_class(InstanceKlass::cast(bottom));
}
}
return false;
}
ArchiveBuilder::FollowMode ArchiveBuilder::get_follow_mode(MetaspaceClosure::Ref *ref) {
address obj = ref->obj();
if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(obj)) {
// Don't dump existing shared metadata again.
return point_to_it;
} else if (ref->msotype() == MetaspaceObj::MethodDataType ||
ref->msotype() == MetaspaceObj::MethodCountersType ||
ref->msotype() == MetaspaceObj::KlassTrainingDataType ||
ref->msotype() == MetaspaceObj::MethodTrainingDataType ||
ref->msotype() == MetaspaceObj::CompileTrainingDataType) {
return (TrainingData::need_data() || TrainingData::assembling_data()) ? make_a_copy : set_to_null;
} else if (ref->msotype() == MetaspaceObj::AdapterHandlerEntryType) {
if (CDSConfig::is_dumping_adapters()) {
AdapterHandlerEntry* entry = (AdapterHandlerEntry*)ref->obj();
return AdapterHandlerLibrary::is_abstract_method_adapter(entry) ? set_to_null : make_a_copy;
} else {
return set_to_null;
}
} else {
if (ref->msotype() == MetaspaceObj::ClassType) {
Klass* klass = (Klass*)ref->obj();
assert(klass->is_klass(), "must be");
if (is_excluded(klass)) {
ResourceMark rm;
log_debug(cds, dynamic)("Skipping class (excluded): %s", klass->external_name());
return set_to_null;
}
}
return make_a_copy;
}
}
void ArchiveBuilder::start_dump_region(DumpRegion* next) {
current_dump_region()->pack(next);
_current_dump_region = next;
}
char* ArchiveBuilder::ro_strdup(const char* s) {
char* archived_str = ro_region_alloc((int)strlen(s) + 1);
strcpy(archived_str, s);
return archived_str;
}
// The objects that have embedded pointers will sink
// towards the end of the list. This ensures we have a maximum
// number of leading zero bits in the relocation bitmap.
int ArchiveBuilder::compare_src_objs(SourceObjInfo** a, SourceObjInfo** b) {
if ((*a)->has_embedded_pointer() && !(*b)->has_embedded_pointer()) {
return 1;
} else if (!(*a)->has_embedded_pointer() && (*b)->has_embedded_pointer()) {
return -1;
} else {
// This is necessary to keep the sorting order stable. Otherwise the
// archive's contents may not be deterministic.
return (*a)->id() - (*b)->id();
}
}
void ArchiveBuilder::sort_metadata_objs() {
_rw_src_objs.objs()->sort(compare_src_objs);
_ro_src_objs.objs()->sort(compare_src_objs);
}
void ArchiveBuilder::dump_rw_metadata() {
ResourceMark rm;
aot_log_info(aot)("Allocating RW objects ... ");
make_shallow_copies(&_rw_region, &_rw_src_objs);
#if INCLUDE_CDS_JAVA_HEAP
if (CDSConfig::is_dumping_full_module_graph()) {
// Archive the ModuleEntry's and PackageEntry's of the 3 built-in loaders
char* start = rw_region()->top();
ClassLoaderDataShared::allocate_archived_tables();
alloc_stats()->record_modules(rw_region()->top() - start, /*read_only*/false);
}
#endif
}
void ArchiveBuilder::dump_ro_metadata() {
ResourceMark rm;
aot_log_info(aot)("Allocating RO objects ... ");
start_dump_region(&_ro_region);
make_shallow_copies(&_ro_region, &_ro_src_objs);
#if INCLUDE_CDS_JAVA_HEAP
if (CDSConfig::is_dumping_full_module_graph()) {
char* start = ro_region()->top();
ClassLoaderDataShared::init_archived_tables();
alloc_stats()->record_modules(ro_region()->top() - start, /*read_only*/true);
}
#endif
RegeneratedClasses::record_regenerated_objects();
}
void ArchiveBuilder::make_shallow_copies(DumpRegion *dump_region,
const ArchiveBuilder::SourceObjList* src_objs) {
for (int i = 0; i < src_objs->objs()->length(); i++) {
make_shallow_copy(dump_region, src_objs->objs()->at(i));
}
aot_log_info(aot)("done (%d objects)", src_objs->objs()->length());
}
void ArchiveBuilder::make_shallow_copy(DumpRegion *dump_region, SourceObjInfo* src_info) {
address src = src_info->source_addr();
int bytes = src_info->size_in_bytes();
char* dest;
char* oldtop;
char* newtop;
oldtop = dump_region->top();
if (src_info->msotype() == MetaspaceObj::ClassType) {
// Allocate space for a pointer directly in front of the future InstanceKlass, so
// we can do a quick lookup from InstanceKlass* -> RunTimeClassInfo*
// without building another hashtable. See RunTimeClassInfo::get_for()
// in systemDictionaryShared.cpp.
Klass* klass = (Klass*)src;
if (klass->is_instance_klass()) {
SystemDictionaryShared::validate_before_archiving(InstanceKlass::cast(klass));
dump_region->allocate(sizeof(address));
}
// Allocate space for the future InstanceKlass with proper alignment
const size_t alignment =
#ifdef _LP64
UseCompressedClassPointers ?
nth_bit(ArchiveBuilder::precomputed_narrow_klass_shift()) :
SharedSpaceObjectAlignment;
#else
SharedSpaceObjectAlignment;
#endif
dest = dump_region->allocate(bytes, alignment);
} else {
dest = dump_region->allocate(bytes);
}
newtop = dump_region->top();
memcpy(dest, src, bytes);
// Update the hash of buffered sorted symbols for static dump so that the symbols have deterministic contents
if (CDSConfig::is_dumping_static_archive() && (src_info->msotype() == MetaspaceObj::SymbolType)) {
Symbol* buffered_symbol = (Symbol*)dest;
assert(((Symbol*)src)->is_permanent(), "archived symbols must be permanent");
buffered_symbol->update_identity_hash();
}
{
bool created;
_buffered_to_src_table.put_if_absent((address)dest, src, &created);
assert(created, "must be");
if (_buffered_to_src_table.maybe_grow()) {
log_info(aot, hashtables)("Expanded _buffered_to_src_table table to %d", _buffered_to_src_table.table_size());
}
}
intptr_t* archived_vtable = CppVtables::get_archived_vtable(src_info->msotype(), (address)dest);
if (archived_vtable != nullptr) {
*(address*)dest = (address)archived_vtable;
ArchivePtrMarker::mark_pointer((address*)dest);
}
log_trace(aot)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(src), p2i(dest), bytes);
src_info->set_buffered_addr((address)dest);
_alloc_stats.record(src_info->msotype(), int(newtop - oldtop), src_info->read_only());
DEBUG_ONLY(_alloc_stats.verify((int)dump_region->used(), src_info->read_only()));
}
// This is used by code that hand-assembles data structures, such as the LambdaProxyClassKey, that are
// not handled by MetaspaceClosure.
void ArchiveBuilder::write_pointer_in_buffer(address* ptr_location, address src_addr) {
assert(is_in_buffer_space(ptr_location), "must be");
if (src_addr == nullptr) {
*ptr_location = nullptr;
ArchivePtrMarker::clear_pointer(ptr_location);
} else {
*ptr_location = get_buffered_addr(src_addr);
ArchivePtrMarker::mark_pointer(ptr_location);
}
}
void ArchiveBuilder::mark_and_relocate_to_buffered_addr(address* ptr_location) {
assert(*ptr_location != nullptr, "sanity");
if (!is_in_mapped_static_archive(*ptr_location)) {
*ptr_location = get_buffered_addr(*ptr_location);
}
ArchivePtrMarker::mark_pointer(ptr_location);
}
bool ArchiveBuilder::has_been_archived(address src_addr) const {
SourceObjInfo* p = _src_obj_table.get(src_addr);
return (p != nullptr);
}
bool ArchiveBuilder::has_been_buffered(address src_addr) const {
if (RegeneratedClasses::has_been_regenerated(src_addr) ||
_src_obj_table.get(src_addr) == nullptr ||
get_buffered_addr(src_addr) == nullptr) {
return false;
} else {
return true;
}
}
address ArchiveBuilder::get_buffered_addr(address src_addr) const {
SourceObjInfo* p = _src_obj_table.get(src_addr);
assert(p != nullptr, "src_addr " INTPTR_FORMAT " is used but has not been archived",
p2i(src_addr));
return p->buffered_addr();
}
address ArchiveBuilder::get_source_addr(address buffered_addr) const {
assert(is_in_buffer_space(buffered_addr), "must be");
address* src_p = _buffered_to_src_table.get(buffered_addr);
assert(src_p != nullptr && *src_p != nullptr, "must be");
return *src_p;
}
void ArchiveBuilder::relocate_embedded_pointers(ArchiveBuilder::SourceObjList* src_objs) {
for (int i = 0; i < src_objs->objs()->length(); i++) {
src_objs->relocate(i, this);
}
}
void ArchiveBuilder::relocate_metaspaceobj_embedded_pointers() {
aot_log_info(aot)("Relocating embedded pointers in core regions ... ");
relocate_embedded_pointers(&_rw_src_objs);
relocate_embedded_pointers(&_ro_src_objs);
log_info(cds)("Relocating %zu pointers, %zu tagged, %zu nulled",
_relocated_ptr_info._num_ptrs,
_relocated_ptr_info._num_tagged_ptrs,
_relocated_ptr_info._num_nulled_ptrs);
}
#define ADD_COUNT(x) \
x += 1; \
x ## _a += aotlinked ? 1 : 0; \
x ## _i += inited ? 1 : 0;
#define DECLARE_INSTANCE_KLASS_COUNTER(x) \
int x = 0; \
int x ## _a = 0; \
int x ## _i = 0;
void ArchiveBuilder::make_klasses_shareable() {
DECLARE_INSTANCE_KLASS_COUNTER(num_instance_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_boot_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_vm_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_platform_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_app_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_old_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_hidden_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_enum_klasses);
DECLARE_INSTANCE_KLASS_COUNTER(num_unregistered_klasses);
int num_unlinked_klasses = 0;
int num_obj_array_klasses = 0;
int num_type_array_klasses = 0;
int boot_unlinked = 0;
int platform_unlinked = 0;
int app_unlinked = 0;
int unreg_unlinked = 0;
for (int i = 0; i < klasses()->length(); i++) {
// Some of the code in ConstantPool::remove_unshareable_info() requires the classes
// to be in linked state, so it must be call here before the next loop, which returns
// all classes to unlinked state.
Klass* k = get_buffered_addr(klasses()->at(i));
if (k->is_instance_klass()) {
InstanceKlass::cast(k)->constants()->remove_unshareable_info();
}
}
for (int i = 0; i < klasses()->length(); i++) {
const char* type;
const char* unlinked = "";
const char* kind = "";
const char* hidden = "";
const char* old = "";
const char* generated = "";
const char* aotlinked_msg = "";
const char* inited_msg = "";
Klass* k = get_buffered_addr(klasses()->at(i));
bool inited = false;
k->remove_java_mirror();
#ifdef _LP64
if (UseCompactObjectHeaders) {
Klass* requested_k = to_requested(k);
address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
const int narrow_klass_shift = precomputed_narrow_klass_shift();
narrowKlass nk = CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
k->set_prototype_header(markWord::prototype().set_narrow_klass(nk));
}
#endif //_LP64
if (k->is_objArray_klass()) {
// InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
// on their array classes.
num_obj_array_klasses ++;
type = "array";
} else if (k->is_typeArray_klass()) {
num_type_array_klasses ++;
type = "array";
k->remove_unshareable_info();
} else {
assert(k->is_instance_klass(), " must be");
InstanceKlass* ik = InstanceKlass::cast(k);
InstanceKlass* src_ik = get_source_addr(ik);
bool aotlinked = AOTClassLinker::is_candidate(src_ik);
inited = ik->has_aot_initialized_mirror();
ADD_COUNT(num_instance_klasses);
if (ik->is_hidden()) {
ADD_COUNT(num_hidden_klasses);
hidden = " hidden";
oop loader = k->class_loader();
if (loader == nullptr) {
type = "boot";
ADD_COUNT(num_boot_klasses);
} else if (loader == SystemDictionary::java_platform_loader()) {
type = "plat";
ADD_COUNT(num_platform_klasses);
} else if (loader == SystemDictionary::java_system_loader()) {
type = "app";
ADD_COUNT(num_app_klasses);
} else {
type = "bad";
assert(0, "shouldn't happen");
}
if (CDSConfig::is_dumping_method_handles()) {
assert(HeapShared::is_archivable_hidden_klass(ik), "sanity");
} else {
// Legacy CDS support for lambda proxies
CDS_JAVA_HEAP_ONLY(assert(HeapShared::is_lambda_proxy_klass(ik), "sanity");)
}
} else if (ik->defined_by_boot_loader()) {
type = "boot";
ADD_COUNT(num_boot_klasses);
} else if (ik->defined_by_platform_loader()) {
type = "plat";
ADD_COUNT(num_platform_klasses);
} else if (ik->defined_by_app_loader()) {
type = "app";
ADD_COUNT(num_app_klasses);
} else {
assert(ik->defined_by_other_loaders(), "must be");
type = "unreg";
ADD_COUNT(num_unregistered_klasses);
}
if (AOTClassLinker::is_vm_class(src_ik)) {
ADD_COUNT(num_vm_klasses);
}
if (!ik->is_linked()) {
num_unlinked_klasses ++;
unlinked = " unlinked";
if (ik->defined_by_boot_loader()) {
boot_unlinked ++;
} else if (ik->defined_by_platform_loader()) {
platform_unlinked ++;
} else if (ik->defined_by_app_loader()) {
app_unlinked ++;
} else {
unreg_unlinked ++;
}
}
if (ik->is_interface()) {
kind = " interface";
} else if (src_ik->is_enum_subclass()) {
kind = " enum";
ADD_COUNT(num_enum_klasses);
}
if (!ik->can_be_verified_at_dumptime()) {
ADD_COUNT(num_old_klasses);
old = " old";
}
if (ik->is_generated_shared_class()) {
generated = " generated";
}
if (aotlinked) {
aotlinked_msg = " aot-linked";
}
if (inited) {
if (InstanceKlass::cast(k)->static_field_size() == 0) {
inited_msg = " inited (no static fields)";
} else {
inited_msg = " inited";
}
}
MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread::current(), ik);
ik->remove_unshareable_info();
}
if (aot_log_is_enabled(Debug, aot, class)) {
ResourceMark rm;
aot_log_debug(aot, class)("klasses[%5d] = " PTR_FORMAT " %-5s %s%s%s%s%s%s%s%s", i,
p2i(to_requested(k)), type, k->external_name(),
kind, hidden, old, unlinked, generated, aotlinked_msg, inited_msg);
}
}
#define STATS_FORMAT "= %5d, aot-linked = %5d, inited = %5d"
#define STATS_PARAMS(x) num_ ## x, num_ ## x ## _a, num_ ## x ## _i
aot_log_info(aot)("Number of classes %d", num_instance_klasses + num_obj_array_klasses + num_type_array_klasses);
aot_log_info(aot)(" instance classes " STATS_FORMAT, STATS_PARAMS(instance_klasses));
aot_log_info(aot)(" boot " STATS_FORMAT, STATS_PARAMS(boot_klasses));
aot_log_info(aot)(" vm " STATS_FORMAT, STATS_PARAMS(vm_klasses));
aot_log_info(aot)(" platform " STATS_FORMAT, STATS_PARAMS(platform_klasses));
aot_log_info(aot)(" app " STATS_FORMAT, STATS_PARAMS(app_klasses));
aot_log_info(aot)(" unregistered " STATS_FORMAT, STATS_PARAMS(unregistered_klasses));
aot_log_info(aot)(" (enum) " STATS_FORMAT, STATS_PARAMS(enum_klasses));
aot_log_info(aot)(" (hidden) " STATS_FORMAT, STATS_PARAMS(hidden_klasses));
aot_log_info(aot)(" (old) " STATS_FORMAT, STATS_PARAMS(old_klasses));
aot_log_info(aot)(" (unlinked) = %5d, boot = %d, plat = %d, app = %d, unreg = %d",
num_unlinked_klasses, boot_unlinked, platform_unlinked, app_unlinked, unreg_unlinked);
aot_log_info(aot)(" obj array classes = %5d", num_obj_array_klasses);
aot_log_info(aot)(" type array classes = %5d", num_type_array_klasses);
aot_log_info(aot)(" symbols = %5d", _symbols->length());
#undef STATS_FORMAT
#undef STATS_PARAMS
DynamicArchive::make_array_klasses_shareable();
}
void ArchiveBuilder::make_training_data_shareable() {
auto clean_td = [&] (address& src_obj, SourceObjInfo& info) {
if (!is_in_buffer_space(info.buffered_addr())) {
return;
}
if (info.msotype() == MetaspaceObj::KlassTrainingDataType ||
info.msotype() == MetaspaceObj::MethodTrainingDataType ||
info.msotype() == MetaspaceObj::CompileTrainingDataType) {
TrainingData* buffered_td = (TrainingData*)info.buffered_addr();
buffered_td->remove_unshareable_info();
} else if (info.msotype() == MetaspaceObj::MethodDataType) {
MethodData* buffered_mdo = (MethodData*)info.buffered_addr();
buffered_mdo->remove_unshareable_info();
} else if (info.msotype() == MetaspaceObj::MethodCountersType) {
MethodCounters* buffered_mc = (MethodCounters*)info.buffered_addr();
buffered_mc->remove_unshareable_info();
}
};
_src_obj_table.iterate_all(clean_td);
}
void ArchiveBuilder::serialize_dynamic_archivable_items(SerializeClosure* soc) {
SymbolTable::serialize_shared_table_header(soc, false);
SystemDictionaryShared::serialize_dictionary_headers(soc, false);
DynamicArchive::serialize_array_klasses(soc);
AOTLinkedClassBulkLoader::serialize(soc, false);
}
uintx ArchiveBuilder::buffer_to_offset(address p) const {
address requested_p = to_requested(p);
assert(requested_p >= _requested_static_archive_bottom, "must be");
return requested_p - _requested_static_archive_bottom;
}
uintx ArchiveBuilder::any_to_offset(address p) const {
if (is_in_mapped_static_archive(p)) {
assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
return p - _mapped_static_archive_bottom;
}
if (!is_in_buffer_space(p)) {
// p must be a "source" address
p = get_buffered_addr(p);
}
return buffer_to_offset(p);
}
address ArchiveBuilder::offset_to_buffered_address(u4 offset) const {
address requested_addr = _requested_static_archive_bottom + offset;
address buffered_addr = requested_addr - _buffer_to_requested_delta;
assert(is_in_buffer_space(buffered_addr), "bad offset");
return buffered_addr;
}
void ArchiveBuilder::start_ac_region() {
ro_region()->pack();
start_dump_region(&_ac_region);
}
void ArchiveBuilder::end_ac_region() {
_ac_region.pack();
}
#if INCLUDE_CDS_JAVA_HEAP
narrowKlass ArchiveBuilder::get_requested_narrow_klass(Klass* k) {
assert(CDSConfig::is_dumping_heap(), "sanity");
k = get_buffered_klass(k);
Klass* requested_k = to_requested(k);
const int narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
#ifdef ASSERT
const size_t klass_alignment = MAX2(SharedSpaceObjectAlignment, (size_t)nth_bit(narrow_klass_shift));
assert(is_aligned(k, klass_alignment), "Klass " PTR_FORMAT " misaligned.", p2i(k));
#endif
address narrow_klass_base = _requested_static_archive_bottom; // runtime encoding base == runtime mapping start
// Note: use the "raw" version of encode that takes explicit narrow klass base and shift. Don't use any
// of the variants that do sanity checks, nor any of those that use the current - dump - JVM's encoding setting.
return CompressedKlassPointers::encode_not_null_without_asserts(requested_k, narrow_klass_base, narrow_klass_shift);
}
#endif // INCLUDE_CDS_JAVA_HEAP
// RelocateBufferToRequested --- Relocate all the pointers in rw/ro,
// so that the archive can be mapped to the "requested" location without runtime relocation.
//
// - See ArchiveBuilder header for the definition of "buffer", "mapped" and "requested"
// - ArchivePtrMarker::ptrmap() marks all the pointers in the rw/ro regions
// - Every pointer must have one of the following values:
// [a] nullptr:
// No relocation is needed. Remove this pointer from ptrmap so we don't need to
// consider it at runtime.
// [b] Points into an object X which is inside the buffer:
// Adjust this pointer by _buffer_to_requested_delta, so it points to X
// when the archive is mapped at the requested location.
// [c] Points into an object Y which is inside mapped static archive:
// - This happens only during dynamic dump
// - Adjust this pointer by _mapped_to_requested_static_archive_delta,
// so it points to Y when the static archive is mapped at the requested location.
template <bool STATIC_DUMP>
class RelocateBufferToRequested : public BitMapClosure {
ArchiveBuilder* _builder;
address _buffer_bottom;
intx _buffer_to_requested_delta;
intx _mapped_to_requested_static_archive_delta;
size_t _max_non_null_offset;
public:
RelocateBufferToRequested(ArchiveBuilder* builder) {
_builder = builder;
_buffer_bottom = _builder->buffer_bottom();
_buffer_to_requested_delta = builder->buffer_to_requested_delta();
_mapped_to_requested_static_archive_delta = builder->requested_static_archive_bottom() - builder->mapped_static_archive_bottom();
_max_non_null_offset = 0;
address bottom = _builder->buffer_bottom();
address top = _builder->buffer_top();
address new_bottom = bottom + _buffer_to_requested_delta;
address new_top = top + _buffer_to_requested_delta;
aot_log_debug(aot)("Relocating archive from [" INTPTR_FORMAT " - " INTPTR_FORMAT "] to "
"[" INTPTR_FORMAT " - " INTPTR_FORMAT "]",
p2i(bottom), p2i(top),
p2i(new_bottom), p2i(new_top));
}
bool do_bit(size_t offset) {
address* p = (address*)_buffer_bottom + offset;
assert(_builder->is_in_buffer_space(p), "pointer must live in buffer space");
if (*p == nullptr) {
// todo -- clear bit, etc
ArchivePtrMarker::ptrmap()->clear_bit(offset);
} else {
if (STATIC_DUMP) {
assert(_builder->is_in_buffer_space(*p), "old pointer must point inside buffer space");
*p += _buffer_to_requested_delta;
assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
} else {
if (_builder->is_in_buffer_space(*p)) {
*p += _buffer_to_requested_delta;
// assert is in requested dynamic archive
} else {
assert(_builder->is_in_mapped_static_archive(*p), "old pointer must point inside buffer space or mapped static archive");
*p += _mapped_to_requested_static_archive_delta;
assert(_builder->is_in_requested_static_archive(*p), "new pointer must point inside requested archive");
}
}
_max_non_null_offset = offset;
}
return true; // keep iterating
}
void doit() {
ArchivePtrMarker::ptrmap()->iterate(this);
ArchivePtrMarker::compact(_max_non_null_offset);
}
};
#ifdef _LP64
int ArchiveBuilder::precomputed_narrow_klass_shift() {
// Legacy Mode:
// We use 32 bits for narrowKlass, which should cover the full 4G Klass range. Shift can be 0.
// CompactObjectHeader Mode:
// narrowKlass is much smaller, and we use the highest possible shift value to later get the maximum
// Klass encoding range.
//
// Note that all of this may change in the future, if we decide to correct the pre-calculated
// narrow Klass IDs at archive load time.
assert(UseCompressedClassPointers, "Only needed for compressed class pointers");
return UseCompactObjectHeaders ? CompressedKlassPointers::max_shift() : 0;
}
#endif // _LP64
void ArchiveBuilder::relocate_to_requested() {
if (!ro_region()->is_packed()) {
ro_region()->pack();
}
size_t my_archive_size = buffer_top() - buffer_bottom();
if (CDSConfig::is_dumping_static_archive()) {
_requested_static_archive_top = _requested_static_archive_bottom + my_archive_size;
RelocateBufferToRequested<true> patcher(this);
patcher.doit();
} else {
assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
_requested_dynamic_archive_top = _requested_dynamic_archive_bottom + my_archive_size;
RelocateBufferToRequested<false> patcher(this);
patcher.doit();
}
}
// Write detailed info to a mapfile to analyze contents of the archive.
// static dump:
// java -Xshare:dump -Xlog:cds+map=trace:file=cds.map:none:filesize=0
// dynamic dump:
// java -cp MyApp.jar -XX:ArchiveClassesAtExit=MyApp.jsa \
// -Xlog:cds+map=trace:file=cds.map:none:filesize=0 MyApp
//
// We need to do some address translation because the buffers used at dump time may be mapped to
// a different location at runtime. At dump time, the buffers may be at arbitrary locations
// picked by the OS. At runtime, we try to map at a fixed location (SharedBaseAddress). For
// consistency, we log everything using runtime addresses.
class ArchiveBuilder::CDSMapLogger : AllStatic {
static intx buffer_to_runtime_delta() {
// Translate the buffers used by the RW/RO regions to their eventual (requested) locations
// at runtime.
return ArchiveBuilder::current()->buffer_to_requested_delta();
}
// rw/ro regions only
static void log_metaspace_region(const char* name, DumpRegion* region,
const ArchiveBuilder::SourceObjList* src_objs) {
address region_base = address(region->base());
address region_top = address(region->top());
log_region(name, region_base, region_top, region_base + buffer_to_runtime_delta());
log_metaspace_objects(region, src_objs);
}
#define _LOG_PREFIX PTR_FORMAT ": @@ %-17s %d"
static void log_klass(Klass* k, address runtime_dest, const char* type_name, int bytes, Thread* current) {
ResourceMark rm(current);
log_debug(aot, map)(_LOG_PREFIX " %s",
p2i(runtime_dest), type_name, bytes, k->external_name());
}
static void log_method(Method* m, address runtime_dest, const char* type_name, int bytes, Thread* current) {
ResourceMark rm(current);
log_debug(aot, map)(_LOG_PREFIX " %s",
p2i(runtime_dest), type_name, bytes, m->external_name());
}
// rw/ro regions only
static void log_metaspace_objects(DumpRegion* region, const ArchiveBuilder::SourceObjList* src_objs) {
address last_obj_base = address(region->base());
address last_obj_end = address(region->base());
address region_end = address(region->end());
Thread* current = Thread::current();
for (int i = 0; i < src_objs->objs()->length(); i++) {
SourceObjInfo* src_info = src_objs->at(i);
address src = src_info->source_addr();
address dest = src_info->buffered_addr();
log_as_hex(last_obj_base, dest, last_obj_base + buffer_to_runtime_delta());
address runtime_dest = dest + buffer_to_runtime_delta();
int bytes = src_info->size_in_bytes();
MetaspaceObj::Type type = src_info->msotype();
const char* type_name = MetaspaceObj::type_name(type);
switch (type) {
case MetaspaceObj::ClassType:
log_klass((Klass*)src, runtime_dest, type_name, bytes, current);
break;
case MetaspaceObj::ConstantPoolType:
log_klass(((ConstantPool*)src)->pool_holder(),
runtime_dest, type_name, bytes, current);
break;
case MetaspaceObj::ConstantPoolCacheType:
log_klass(((ConstantPoolCache*)src)->constant_pool()->pool_holder(),
runtime_dest, type_name, bytes, current);
break;
case MetaspaceObj::MethodType:
log_method((Method*)src, runtime_dest, type_name, bytes, current);
break;
case MetaspaceObj::ConstMethodType:
log_method(((ConstMethod*)src)->method(), runtime_dest, type_name, bytes, current);
break;
case MetaspaceObj::SymbolType:
{
ResourceMark rm(current);
Symbol* s = (Symbol*)src;
log_debug(aot, map)(_LOG_PREFIX " %s", p2i(runtime_dest), type_name, bytes,
s->as_quoted_ascii());
}
break;
default:
log_debug(aot, map)(_LOG_PREFIX, p2i(runtime_dest), type_name, bytes);
break;
}
last_obj_base = dest;
last_obj_end = dest + bytes;
}
log_as_hex(last_obj_base, last_obj_end, last_obj_base + buffer_to_runtime_delta());
if (last_obj_end < region_end) {
log_debug(aot, map)(PTR_FORMAT ": @@ Misc data %zu bytes",
p2i(last_obj_end + buffer_to_runtime_delta()),
size_t(region_end - last_obj_end));
log_as_hex(last_obj_end, region_end, last_obj_end + buffer_to_runtime_delta());
}
}
#undef _LOG_PREFIX
// Log information about a region, whose address at dump time is [base .. top). At
// runtime, this region will be mapped to requested_base. requested_base is nullptr if this
// region will be mapped at os-selected addresses (such as the bitmap region), or will
// be accessed with os::read (the header).
//
// Note: across -Xshare:dump runs, base may be different, but requested_base should
// be the same as the archive contents should be deterministic.
static void log_region(const char* name, address base, address top, address requested_base) {
size_t size = top - base;
base = requested_base;
if (requested_base == nullptr) {
top = (address)size;
} else {
top = requested_base + size;
}
log_info(aot, map)("[%-18s " PTR_FORMAT " - " PTR_FORMAT " %9zu bytes]",
name, p2i(base), p2i(top), size);
}
#if INCLUDE_CDS_JAVA_HEAP
static void log_heap_region(ArchiveHeapInfo* heap_info) {
MemRegion r = heap_info->buffer_region();
address start = address(r.start()); // start of the current oop inside the buffer
address end = address(r.end());
log_region("heap", start, end, ArchiveHeapWriter::buffered_addr_to_requested_addr(start));
LogStreamHandle(Info, aot, map) st;
HeapRootSegments segments = heap_info->heap_root_segments();
assert(segments.base_offset() == 0, "Sanity");
for (size_t seg_idx = 0; seg_idx < segments.count(); seg_idx++) {
address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
st.print_cr(PTR_FORMAT ": Heap roots segment [%d]",
p2i(requested_start), segments.size_in_elems(seg_idx));
start += segments.size_in_bytes(seg_idx);
}
log_heap_roots();
while (start < end) {
size_t byte_size;
oop source_oop = ArchiveHeapWriter::buffered_addr_to_source_obj(start);
address requested_start = ArchiveHeapWriter::buffered_addr_to_requested_addr(start);
st.print(PTR_FORMAT ": @@ Object ", p2i(requested_start));
if (source_oop != nullptr) {
// This is a regular oop that got archived.
// Don't print the requested addr again as we have just printed it at the beginning of the line.
// Example:
// 0x00000007ffd27938: @@ Object (0xfffa4f27) java.util.HashMap
print_oop_info_cr(&st, source_oop, /*print_requested_addr=*/false);
byte_size = source_oop->size() * BytesPerWord;
} else if ((byte_size = ArchiveHeapWriter::get_filler_size_at(start)) > 0) {
// We have a filler oop, which also does not exist in BufferOffsetToSourceObjectTable.
// Example:
// 0x00000007ffc3ffd8: @@ Object filler 40 bytes
st.print_cr("filler %zu bytes", byte_size);
} else {
ShouldNotReachHere();
}
address oop_end = start + byte_size;
log_as_hex(start, oop_end, requested_start, /*is_heap=*/true);
if (source_oop != nullptr) {
log_oop_details(heap_info, source_oop, /*buffered_addr=*/start);
}
start = oop_end;
}
}
// ArchivedFieldPrinter is used to print the fields of archived objects. We can't
// use _source_obj->print_on(), because we want to print the oop fields
// in _source_obj with their requested addresses using print_oop_info_cr().
class ArchivedFieldPrinter : public FieldClosure {
ArchiveHeapInfo* _heap_info;
outputStream* _st;
oop _source_obj;
address _buffered_addr;
public:
ArchivedFieldPrinter(ArchiveHeapInfo* heap_info, outputStream* st, oop src_obj, address buffered_addr) :
_heap_info(heap_info), _st(st), _source_obj(src_obj), _buffered_addr(buffered_addr) {}
void do_field(fieldDescriptor* fd) {
_st->print(" - ");
BasicType ft = fd->field_type();
switch (ft) {
case T_ARRAY:
case T_OBJECT:
{
fd->print_on(_st); // print just the name and offset
oop obj = _source_obj->obj_field(fd->offset());
if (java_lang_Class::is_instance(obj)) {
obj = HeapShared::scratch_java_mirror(obj);
}
print_oop_info_cr(_st, obj);
}
break;
default:
if (ArchiveHeapWriter::is_marked_as_native_pointer(_heap_info, _source_obj, fd->offset())) {
print_as_native_pointer(fd);
} else {
fd->print_on_for(_st, cast_to_oop(_buffered_addr)); // name, offset, value
_st->cr();
}
}
}
void print_as_native_pointer(fieldDescriptor* fd) {
LP64_ONLY(assert(fd->field_type() == T_LONG, "must be"));
NOT_LP64 (assert(fd->field_type() == T_INT, "must be"));
// We have a field that looks like an integer, but it's actually a pointer to a MetaspaceObj.
address source_native_ptr = (address)
LP64_ONLY(_source_obj->long_field(fd->offset()))
NOT_LP64( _source_obj->int_field (fd->offset()));
ArchiveBuilder* builder = ArchiveBuilder::current();
// The value of the native pointer at runtime.
address requested_native_ptr = builder->to_requested(builder->get_buffered_addr(source_native_ptr));
// The address of _source_obj at runtime
oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(_source_obj);
// The address of this field in the requested space
assert(requested_obj != nullptr, "Attempting to load field from null oop");
address requested_field_addr = cast_from_oop<address>(requested_obj) + fd->offset();
fd->print_on(_st);
_st->print_cr(PTR_FORMAT " (marked metadata pointer @" PTR_FORMAT " )",
p2i(requested_native_ptr), p2i(requested_field_addr));
}
};
// Print the fields of instanceOops, or the elements of arrayOops
static void log_oop_details(ArchiveHeapInfo* heap_info, oop source_oop, address buffered_addr) {
LogStreamHandle(Trace, aot, map, oops) st;
if (st.is_enabled()) {
Klass* source_klass = source_oop->klass();
ArchiveBuilder* builder = ArchiveBuilder::current();
Klass* requested_klass = builder->to_requested(builder->get_buffered_addr(source_klass));
st.print(" - klass: ");
source_klass->print_value_on(&st);
st.print(" " PTR_FORMAT, p2i(requested_klass));
st.cr();
if (source_oop->is_typeArray()) {
TypeArrayKlass::cast(source_klass)->oop_print_elements_on(typeArrayOop(source_oop), &st);
} else if (source_oop->is_objArray()) {
objArrayOop source_obj_array = objArrayOop(source_oop);
for (int i = 0; i < source_obj_array->length(); i++) {
st.print(" -%4d: ", i);
oop obj = source_obj_array->obj_at(i);
if (java_lang_Class::is_instance(obj)) {
obj = HeapShared::scratch_java_mirror(obj);
}
print_oop_info_cr(&st, obj);
}
} else {
st.print_cr(" - fields (%zu words):", source_oop->size());
ArchivedFieldPrinter print_field(heap_info, &st, source_oop, buffered_addr);
InstanceKlass::cast(source_klass)->print_nonstatic_fields(&print_field);
if (java_lang_Class::is_instance(source_oop)) {
oop scratch_mirror = source_oop;
st.print(" - signature: ");
print_class_signature_for_mirror(&st, scratch_mirror);
st.cr();
Klass* src_klass = java_lang_Class::as_Klass(scratch_mirror);
if (src_klass != nullptr && src_klass->is_instance_klass()) {
oop rr = HeapShared::scratch_resolved_references(InstanceKlass::cast(src_klass)->constants());
st.print(" - archived_resolved_references: ");
print_oop_info_cr(&st, rr);
// We need to print the fields in the scratch_mirror, not the original mirror.
// (if a class is not aot-initialized, static fields in its scratch mirror will be cleared).
assert(scratch_mirror == HeapShared::scratch_java_mirror(src_klass->java_mirror()), "sanity");
st.print_cr("- ---- static fields (%d):", java_lang_Class::static_oop_field_count(scratch_mirror));
InstanceKlass::cast(src_klass)->do_local_static_fields(&print_field);
}
}
}
}
}
static void print_class_signature_for_mirror(outputStream* st, oop scratch_mirror) {
assert(java_lang_Class::is_instance(scratch_mirror), "sanity");
if (java_lang_Class::is_primitive(scratch_mirror)) {
for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
BasicType bt = (BasicType)i;
if (!is_reference_type(bt) && scratch_mirror == HeapShared::scratch_java_mirror(bt)) {
oop orig_mirror = Universe::java_mirror(bt);
java_lang_Class::print_signature(orig_mirror, st);
return;
}
}
ShouldNotReachHere();
}
java_lang_Class::print_signature(scratch_mirror, st);
}
static void log_heap_roots() {
LogStreamHandle(Trace, aot, map, oops) st;
if (st.is_enabled()) {
for (int i = 0; i < HeapShared::pending_roots()->length(); i++) {
st.print("roots[%4d]: ", i);
print_oop_info_cr(&st, HeapShared::pending_roots()->at(i));
}
}
}
// Example output:
// - The first number is the requested address (if print_requested_addr == true)
// - The second number is the narrowOop version of the requested address (if UseCompressedOops == true)
// 0x00000007ffc7e840 (0xfff8fd08) java.lang.Class Ljava/util/Array;
// 0x00000007ffc000f8 (0xfff8001f) [B length: 11
static void print_oop_info_cr(outputStream* st, oop source_oop, bool print_requested_addr = true) {
if (source_oop == nullptr) {
st->print_cr("null");
} else {
ResourceMark rm;
oop requested_obj = ArchiveHeapWriter::source_obj_to_requested_obj(source_oop);
if (print_requested_addr) {
st->print(PTR_FORMAT " ", p2i(requested_obj));
}
if (UseCompressedOops) {
st->print("(0x%08x) ", CompressedOops::narrow_oop_value(requested_obj));
}
if (source_oop->is_array()) {
int array_len = arrayOop(source_oop)->length();
st->print_cr("%s length: %d", source_oop->klass()->external_name(), array_len);
} else {
st->print("%s", source_oop->klass()->external_name());
if (java_lang_String::is_instance(source_oop)) {
st->print(" ");
java_lang_String::print(source_oop, st);
} else if (java_lang_Class::is_instance(source_oop)) {
oop scratch_mirror = source_oop;
st->print(" ");
print_class_signature_for_mirror(st, scratch_mirror);
Klass* src_klass = java_lang_Class::as_Klass(scratch_mirror);
if (src_klass != nullptr && src_klass->is_instance_klass()) {
InstanceKlass* buffered_klass =
ArchiveBuilder::current()->get_buffered_addr(InstanceKlass::cast(src_klass));
if (buffered_klass->has_aot_initialized_mirror()) {
st->print(" (aot-inited)");
}
}
}
st->cr();
}
}
}
#endif // INCLUDE_CDS_JAVA_HEAP
// Log all the data [base...top). Pretend that the base address
// will be mapped to requested_base at run-time.
static void log_as_hex(address base, address top, address requested_base, bool is_heap = false) {
assert(top >= base, "must be");
LogStreamHandle(Trace, aot, map) lsh;
if (lsh.is_enabled()) {
int unitsize = sizeof(address);
if (is_heap && UseCompressedOops) {
// This makes the compressed oop pointers easier to read, but
// longs and doubles will be split into two words.
unitsize = sizeof(narrowOop);
}
os::print_hex_dump(&lsh, base, top, unitsize, /* print_ascii=*/true, /* bytes_per_line=*/32, requested_base);
}
}
static void log_header(FileMapInfo* mapinfo) {
LogStreamHandle(Info, aot, map) lsh;
if (lsh.is_enabled()) {
mapinfo->print(&lsh);
}
}
public:
static void log(ArchiveBuilder* builder, FileMapInfo* mapinfo,
ArchiveHeapInfo* heap_info,
char* bitmap, size_t bitmap_size_in_bytes) {
log_info(aot, map)("%s CDS archive map for %s", CDSConfig::is_dumping_static_archive() ? "Static" : "Dynamic", mapinfo->full_path());
address header = address(mapinfo->header());
address header_end = header + mapinfo->header()->header_size();
log_region("header", header, header_end, nullptr);
log_header(mapinfo);
log_as_hex(header, header_end, nullptr);
DumpRegion* rw_region = &builder->_rw_region;
DumpRegion* ro_region = &builder->_ro_region;
log_metaspace_region("rw region", rw_region, &builder->_rw_src_objs);
log_metaspace_region("ro region", ro_region, &builder->_ro_src_objs);
address bitmap_end = address(bitmap + bitmap_size_in_bytes);
log_region("bitmap", address(bitmap), bitmap_end, nullptr);
log_as_hex((address)bitmap, bitmap_end, nullptr);
#if INCLUDE_CDS_JAVA_HEAP
if (heap_info->is_used()) {
log_heap_region(heap_info);
}
#endif
log_info(aot, map)("[End of CDS archive map]");
}
}; // end ArchiveBuilder::CDSMapLogger
void ArchiveBuilder::print_stats() {
_alloc_stats.print_stats(int(_ro_region.used()), int(_rw_region.used()));
}
void ArchiveBuilder::write_archive(FileMapInfo* mapinfo, ArchiveHeapInfo* heap_info) {
// Make sure NUM_CDS_REGIONS (exported in cds.h) agrees with
// MetaspaceShared::n_regions (internal to hotspot).
assert(NUM_CDS_REGIONS == MetaspaceShared::n_regions, "sanity");
write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
write_region(mapinfo, MetaspaceShared::ac, &_ac_region, /*read_only=*/false,/*allow_exec=*/false);
// Split pointer map into read-write and read-only bitmaps
ArchivePtrMarker::initialize_rw_ro_maps(&_rw_ptrmap, &_ro_ptrmap);
size_t bitmap_size_in_bytes;
char* bitmap = mapinfo->write_bitmap_region(ArchivePtrMarker::rw_ptrmap(), ArchivePtrMarker::ro_ptrmap(), heap_info,
bitmap_size_in_bytes);
if (heap_info->is_used()) {
_total_heap_region_size = mapinfo->write_heap_region(heap_info);
}
print_region_stats(mapinfo, heap_info);
mapinfo->set_requested_base((char*)MetaspaceShared::requested_base_address());
mapinfo->set_header_crc(mapinfo->compute_header_crc());
// After this point, we should not write any data into mapinfo->header() since this
// would corrupt its checksum we have calculated before.
mapinfo->write_header();
mapinfo->close();
if (log_is_enabled(Info, aot)) {
log_info(aot)("Full module graph = %s", CDSConfig::is_dumping_full_module_graph() ? "enabled" : "disabled");
print_stats();
}
if (log_is_enabled(Info, aot, map)) {
CDSMapLogger::log(this, mapinfo, heap_info,
bitmap, bitmap_size_in_bytes);
}
CDS_JAVA_HEAP_ONLY(HeapShared::destroy_archived_object_cache());
FREE_C_HEAP_ARRAY(char, bitmap);
}
void ArchiveBuilder::write_region(FileMapInfo* mapinfo, int region_idx, DumpRegion* dump_region, bool read_only, bool allow_exec) {
mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
}
void ArchiveBuilder::count_relocated_pointer(bool tagged, bool nulled) {
_relocated_ptr_info._num_ptrs ++;
_relocated_ptr_info._num_tagged_ptrs += tagged ? 1 : 0;
_relocated_ptr_info._num_nulled_ptrs += nulled ? 1 : 0;
}
void ArchiveBuilder::print_region_stats(FileMapInfo *mapinfo, ArchiveHeapInfo* heap_info) {
// Print statistics of all the regions
const size_t bitmap_used = mapinfo->region_at(MetaspaceShared::bm)->used();
const size_t bitmap_reserved = mapinfo->region_at(MetaspaceShared::bm)->used_aligned();
const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
bitmap_reserved +
_total_heap_region_size;
const size_t total_bytes = _ro_region.used() + _rw_region.used() +
bitmap_used +
_total_heap_region_size;
const double total_u_perc = percent_of(total_bytes, total_reserved);
_rw_region.print(total_reserved);
_ro_region.print(total_reserved);
_ac_region.print(total_reserved);
print_bitmap_region_stats(bitmap_used, total_reserved);
if (heap_info->is_used()) {
print_heap_region_stats(heap_info, total_reserved);
}
aot_log_debug(aot)("total : %9zu [100.0%% of total] out of %9zu bytes [%5.1f%% used]",
total_bytes, total_reserved, total_u_perc);
}
void ArchiveBuilder::print_bitmap_region_stats(size_t size, size_t total_size) {
aot_log_debug(aot)("bm space: %9zu [ %4.1f%% of total] out of %9zu bytes [100.0%% used]",
size, size/double(total_size)*100.0, size);
}
void ArchiveBuilder::print_heap_region_stats(ArchiveHeapInfo *info, size_t total_size) {
char* start = info->buffer_start();
size_t size = info->buffer_byte_size();
char* top = start + size;
aot_log_debug(aot)("hp space: %9zu [ %4.1f%% of total] out of %9zu bytes [100.0%% used] at " INTPTR_FORMAT,
size, size/double(total_size)*100.0, size, p2i(start));
}
void ArchiveBuilder::report_out_of_space(const char* name, size_t needed_bytes) {
// This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
// On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
// or so.
_rw_region.print_out_of_space_msg(name, needed_bytes);
_ro_region.print_out_of_space_msg(name, needed_bytes);
log_error(aot)("Unable to allocate from '%s' region: Please reduce the number of shared classes.", name);
MetaspaceShared::unrecoverable_writing_error();
}
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