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metaspaceShared.cpp
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metaspaceShared.cpp
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/*
* Copyright (c) 2012, 2021, 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 "precompiled.hpp"
#include "jvm_io.h"
#include "cds/archiveBuilder.hpp"
#include "cds/classListParser.hpp"
#include "cds/cppVtables.hpp"
#include "cds/dumpAllocStats.hpp"
#include "cds/filemap.hpp"
#include "cds/heapShared.hpp"
#include "cds/lambdaFormInvokers.hpp"
#include "cds/metaspaceShared.hpp"
#include "classfile/classLoaderDataGraph.hpp"
#include "classfile/classLoaderDataShared.hpp"
#include "classfile/classLoaderExt.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/loaderConstraints.hpp"
#include "classfile/placeholders.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/stringTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/systemDictionaryShared.hpp"
#include "classfile/vmClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "code/codeCache.hpp"
#include "gc/shared/gcVMOperations.hpp"
#include "interpreter/bytecodeStream.hpp"
#include "interpreter/bytecodes.hpp"
#include "logging/log.hpp"
#include "logging/logMessage.hpp"
#include "logging/logStream.hpp"
#include "memory/metaspace.hpp"
#include "memory/metaspaceClosure.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/compressedOops.inline.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/objArrayOop.hpp"
#include "oops/oop.inline.hpp"
#include "oops/oopHandle.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/arguments.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/os.hpp"
#include "runtime/safepointVerifiers.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/vmThread.hpp"
#include "runtime/vmOperations.hpp"
#include "utilities/align.hpp"
#include "utilities/bitMap.inline.hpp"
#include "utilities/ostream.hpp"
#include "utilities/defaultStream.hpp"
#if INCLUDE_G1GC
#include "gc/g1/g1CollectedHeap.inline.hpp"
#endif
ReservedSpace MetaspaceShared::_symbol_rs;
VirtualSpace MetaspaceShared::_symbol_vs;
bool MetaspaceShared::_has_error_classes;
bool MetaspaceShared::_archive_loading_failed = false;
bool MetaspaceShared::_remapped_readwrite = false;
void* MetaspaceShared::_shared_metaspace_static_top = NULL;
intx MetaspaceShared::_relocation_delta;
char* MetaspaceShared::_requested_base_address;
bool MetaspaceShared::_use_optimized_module_handling = true;
bool MetaspaceShared::_use_full_module_graph = true;
// The CDS archive is divided into the following regions:
// rw - read-write metadata
// ro - read-only metadata and read-only tables
//
// ca0 - closed archive heap space #0
// ca1 - closed archive heap space #1 (may be empty)
// oa0 - open archive heap space #0
// oa1 - open archive heap space #1 (may be empty)
//
// bm - bitmap for relocating the above 7 regions.
//
// The rw and ro regions are linearly allocated, in the order of rw->ro.
// These regions are aligned with MetaspaceShared::core_region_alignment().
//
// These 2 regions are populated in the following steps:
// [0] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
// temporarily allocated outside of the shared regions.
// [1] We enter a safepoint and allocate a buffer for the rw/ro regions.
// [2] C++ vtables are copied into the rw region.
// [3] ArchiveBuilder copies RW metadata into the rw region.
// [4] ArchiveBuilder copies RO metadata into the ro region.
// [5] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
// are copied into the ro region as read-only tables.
//
// The ca0/ca1 and oa0/oa1 regions are populated inside HeapShared::archive_java_heap_objects.
// Their layout is independent of the rw/ro regions.
static DumpRegion _symbol_region("symbols");
char* MetaspaceShared::symbol_space_alloc(size_t num_bytes) {
return _symbol_region.allocate(num_bytes);
}
// os::vm_allocation_granularity() is usually 4K for most OSes. However, on Linux/aarch64,
// it can be either 4K or 64K and on Macosx-arm it is 16K. To generate archives that are
// compatible for both settings, an alternative cds core region alignment can be enabled
// at building time:
// --enable-compactible-cds-alignment
// Upon successful configuration, the compactible alignment then can be defined as in:
// os_linux_aarch64.hpp
// which is the highest page size configured on the platform.
size_t MetaspaceShared::core_region_alignment() {
#if defined(CDS_CORE_REGION_ALIGNMENT)
return CDS_CORE_REGION_ALIGNMENT;
#else
return (size_t)os::vm_allocation_granularity();
#endif // CDS_CORE_REGION_ALIGNMENT
}
static bool shared_base_valid(char* shared_base) {
#ifdef _LP64
return CompressedKlassPointers::is_valid_base((address)shared_base);
#else
return true;
#endif
}
class DumpClassListCLDClosure : public CLDClosure {
fileStream *_stream;
public:
DumpClassListCLDClosure(fileStream* f) : CLDClosure() { _stream = f; }
void do_cld(ClassLoaderData* cld) {
for (Klass* klass = cld->klasses(); klass != NULL; klass = klass->next_link()) {
if (klass->is_instance_klass()) {
InstanceKlass* ik = InstanceKlass::cast(klass);
if (ik->is_shareable()) {
_stream->print_cr("%s", ik->name()->as_C_string());
}
}
}
}
};
void MetaspaceShared::dump_loaded_classes(const char* file_name, TRAPS) {
fileStream stream(file_name, "w");
if (stream.is_open()) {
MutexLocker lock(ClassLoaderDataGraph_lock);
DumpClassListCLDClosure collect_classes(&stream);
ClassLoaderDataGraph::loaded_cld_do(&collect_classes);
} else {
THROW_MSG(vmSymbols::java_io_IOException(), "Failed to open file");
}
}
static bool shared_base_too_high(char* specified_base, char* aligned_base, size_t cds_max) {
if (specified_base != NULL && aligned_base < specified_base) {
// SharedBaseAddress is very high (e.g., 0xffffffffffffff00) so
// align_up(SharedBaseAddress, MetaspaceShared::core_region_alignment()) has wrapped around.
return true;
}
if (max_uintx - uintx(aligned_base) < uintx(cds_max)) {
// The end of the archive will wrap around
return true;
}
return false;
}
static char* compute_shared_base(size_t cds_max) {
char* specified_base = (char*)SharedBaseAddress;
char* aligned_base = align_up(specified_base, MetaspaceShared::core_region_alignment());
const char* err = NULL;
if (shared_base_too_high(specified_base, aligned_base, cds_max)) {
err = "too high";
} else if (!shared_base_valid(aligned_base)) {
err = "invalid for this platform";
} else {
return aligned_base;
}
log_warning(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is %s. Reverted to " INTPTR_FORMAT,
p2i((void*)SharedBaseAddress), err,
p2i((void*)Arguments::default_SharedBaseAddress()));
specified_base = (char*)Arguments::default_SharedBaseAddress();
aligned_base = align_up(specified_base, MetaspaceShared::core_region_alignment());
// Make sure the default value of SharedBaseAddress specified in globals.hpp is sane.
assert(!shared_base_too_high(specified_base, aligned_base, cds_max), "Sanity");
assert(shared_base_valid(aligned_base), "Sanity");
return aligned_base;
}
void MetaspaceShared::initialize_for_static_dump() {
assert(DumpSharedSpaces, "should be called for dump time only");
log_info(cds)("Core region alignment: " SIZE_FORMAT, core_region_alignment());
// The max allowed size for CDS archive. We use this to limit SharedBaseAddress
// to avoid address space wrap around.
size_t cds_max;
const size_t reserve_alignment = core_region_alignment();
#ifdef _LP64
const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
cds_max = align_down(UnscaledClassSpaceMax, reserve_alignment);
#else
// We don't support archives larger than 256MB on 32-bit due to limited
// virtual address space.
cds_max = align_down(256*M, reserve_alignment);
#endif
_requested_base_address = compute_shared_base(cds_max);
SharedBaseAddress = (size_t)_requested_base_address;
size_t symbol_rs_size = LP64_ONLY(3 * G) NOT_LP64(128 * M);
_symbol_rs = ReservedSpace(symbol_rs_size);
if (!_symbol_rs.is_reserved()) {
vm_exit_during_initialization("Unable to reserve memory for symbols",
err_msg(SIZE_FORMAT " bytes.", symbol_rs_size));
}
_symbol_region.init(&_symbol_rs, &_symbol_vs);
}
// Called by universe_post_init()
void MetaspaceShared::post_initialize(TRAPS) {
if (UseSharedSpaces) {
int size = FileMapInfo::get_number_of_shared_paths();
if (size > 0) {
SystemDictionaryShared::allocate_shared_data_arrays(size, CHECK);
if (!DynamicDumpSharedSpaces) {
FileMapInfo* info;
if (FileMapInfo::dynamic_info() == NULL) {
info = FileMapInfo::current_info();
} else {
info = FileMapInfo::dynamic_info();
}
ClassLoaderExt::init_paths_start_index(info->app_class_paths_start_index());
ClassLoaderExt::init_app_module_paths_start_index(info->app_module_paths_start_index());
}
}
}
}
static GrowableArrayCHeap<OopHandle, mtClassShared>* _extra_interned_strings = NULL;
static GrowableArrayCHeap<Symbol*, mtClassShared>* _extra_symbols = NULL;
void MetaspaceShared::read_extra_data(JavaThread* current, const char* filename) {
_extra_interned_strings = new GrowableArrayCHeap<OopHandle, mtClassShared>(10000);
_extra_symbols = new GrowableArrayCHeap<Symbol*, mtClassShared>(1000);
HashtableTextDump reader(filename);
reader.check_version("VERSION: 1.0");
while (reader.remain() > 0) {
int utf8_length;
int prefix_type = reader.scan_prefix(&utf8_length);
ResourceMark rm(current);
if (utf8_length == 0x7fffffff) {
// buf_len will overflown 32-bit value.
vm_exit_during_initialization(err_msg("string length too large: %d", utf8_length));
}
int buf_len = utf8_length+1;
char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
reader.get_utf8(utf8_buffer, utf8_length);
utf8_buffer[utf8_length] = '\0';
if (prefix_type == HashtableTextDump::SymbolPrefix) {
_extra_symbols->append(SymbolTable::new_permanent_symbol(utf8_buffer));
} else{
assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
ExceptionMark em(current);
JavaThread* THREAD = current; // For exception macros.
oop str = StringTable::intern(utf8_buffer, THREAD);
if (HAS_PENDING_EXCEPTION) {
log_warning(cds, heap)("[line %d] extra interned string allocation failed; size too large: %d",
reader.last_line_no(), utf8_length);
CLEAR_PENDING_EXCEPTION;
} else {
#if INCLUDE_G1GC
if (UseG1GC) {
typeArrayOop body = java_lang_String::value(str);
const HeapRegion* hr = G1CollectedHeap::heap()->heap_region_containing(body);
if (hr->is_humongous()) {
// Don't keep it alive, so it will be GC'ed before we dump the strings, in order
// to maximize free heap space and minimize fragmentation.
log_warning(cds, heap)("[line %d] extra interned string ignored; size too large: %d",
reader.last_line_no(), utf8_length);
continue;
}
}
#endif
// Make sure this string is included in the dumped interned string table.
assert(str != NULL, "must succeed");
_extra_interned_strings->append(OopHandle(Universe::vm_global(), str));
}
}
}
}
// Read/write a data stream for restoring/preserving metadata pointers and
// miscellaneous data from/to the shared archive file.
void MetaspaceShared::serialize(SerializeClosure* soc) {
int tag = 0;
soc->do_tag(--tag);
// Verify the sizes of various metadata in the system.
soc->do_tag(sizeof(Method));
soc->do_tag(sizeof(ConstMethod));
soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
soc->do_tag(sizeof(ConstantPool));
soc->do_tag(sizeof(ConstantPoolCache));
soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
soc->do_tag(sizeof(Symbol));
// Dump/restore miscellaneous metadata.
JavaClasses::serialize_offsets(soc);
Universe::serialize(soc);
soc->do_tag(--tag);
// Dump/restore references to commonly used names and signatures.
vmSymbols::serialize(soc);
soc->do_tag(--tag);
// Dump/restore the symbol/string/subgraph_info tables
SymbolTable::serialize_shared_table_header(soc);
StringTable::serialize_shared_table_header(soc);
HeapShared::serialize_subgraph_info_table_header(soc);
SystemDictionaryShared::serialize_dictionary_headers(soc);
InstanceMirrorKlass::serialize_offsets(soc);
// Dump/restore well known classes (pointers)
SystemDictionaryShared::serialize_vm_classes(soc);
soc->do_tag(--tag);
CppVtables::serialize(soc);
soc->do_tag(--tag);
CDS_JAVA_HEAP_ONLY(ClassLoaderDataShared::serialize(soc);)
LambdaFormInvokers::serialize(soc);
soc->do_tag(666);
}
static void rewrite_nofast_bytecode(const methodHandle& method) {
BytecodeStream bcs(method);
while (!bcs.is_last_bytecode()) {
Bytecodes::Code opcode = bcs.next();
switch (opcode) {
case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
case Bytecodes::_iload: {
if (!bcs.is_wide()) {
*bcs.bcp() = Bytecodes::_nofast_iload;
}
break;
}
default: break;
}
}
}
// [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
// at run time by RewriteBytecodes/RewriteFrequentPairs
// [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread, InstanceKlass* ik) {
for (int i = 0; i < ik->methods()->length(); i++) {
methodHandle m(thread, ik->methods()->at(i));
if (!ik->can_be_verified_at_dumptime()) {
rewrite_nofast_bytecode(m);
}
Fingerprinter fp(m);
// The side effect of this call sets method's fingerprint field.
fp.fingerprint();
}
}
class VM_PopulateDumpSharedSpace : public VM_GC_Operation {
private:
GrowableArray<MemRegion> *_closed_archive_heap_regions;
GrowableArray<MemRegion> *_open_archive_heap_regions;
GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps;
GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps;
void dump_java_heap_objects(GrowableArray<Klass*>* klasses) NOT_CDS_JAVA_HEAP_RETURN;
void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN;
void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
GrowableArray<ArchiveHeapOopmapInfo>* oopmaps);
void dump_shared_symbol_table(GrowableArray<Symbol*>* symbols) {
log_info(cds)("Dumping symbol table ...");
SymbolTable::write_to_archive(symbols);
}
char* dump_read_only_tables();
public:
VM_PopulateDumpSharedSpace() :
VM_GC_Operation(0 /* total collections, ignored */, GCCause::_archive_time_gc),
_closed_archive_heap_regions(NULL),
_open_archive_heap_regions(NULL),
_closed_archive_heap_oopmaps(NULL),
_open_archive_heap_oopmaps(NULL) {}
bool skip_operation() const { return false; }
VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
void doit(); // outline because gdb sucks
bool allow_nested_vm_operations() const { return true; }
}; // class VM_PopulateDumpSharedSpace
class StaticArchiveBuilder : public ArchiveBuilder {
public:
StaticArchiveBuilder() : ArchiveBuilder() {}
virtual void iterate_roots(MetaspaceClosure* it, bool is_relocating_pointers) {
FileMapInfo::metaspace_pointers_do(it, false);
SystemDictionaryShared::dumptime_classes_do(it);
Universe::metaspace_pointers_do(it);
vmSymbols::metaspace_pointers_do(it);
// The above code should find all the symbols that are referenced by the
// archived classes. We just need to add the extra symbols which
// may not be used by any of the archived classes -- these are usually
// symbols that we anticipate to be used at run time, so we can store
// them in the RO region, to be shared across multiple processes.
if (_extra_symbols != NULL) {
for (int i = 0; i < _extra_symbols->length(); i++) {
it->push(_extra_symbols->adr_at(i));
}
}
}
};
char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
ArchiveBuilder::OtherROAllocMark mark;
SystemDictionaryShared::write_to_archive();
// Write lambform lines into archive
LambdaFormInvokers::dump_static_archive_invokers();
// Write the other data to the output array.
DumpRegion* ro_region = ArchiveBuilder::current()->ro_region();
char* start = ro_region->top();
WriteClosure wc(ro_region);
MetaspaceShared::serialize(&wc);
// Write the bitmaps for patching the archive heap regions
dump_archive_heap_oopmaps();
return start;
}
void VM_PopulateDumpSharedSpace::doit() {
HeapShared::run_full_gc_in_vm_thread();
DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
FileMapInfo::check_nonempty_dir_in_shared_path_table();
NOT_PRODUCT(SystemDictionary::verify();)
// At this point, many classes have been loaded.
// Gather systemDictionary classes in a global array and do everything to
// that so we don't have to walk the SystemDictionary again.
SystemDictionaryShared::check_excluded_classes();
MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
StaticArchiveBuilder builder;
builder.gather_source_objs();
builder.reserve_buffer();
char* cloned_vtables = CppVtables::dumptime_init(&builder);
builder.dump_rw_metadata();
builder.dump_ro_metadata();
builder.relocate_metaspaceobj_embedded_pointers();
// Dump supported java heap objects
dump_java_heap_objects(builder.klasses());
builder.relocate_roots();
dump_shared_symbol_table(builder.symbols());
builder.relocate_vm_classes();
log_info(cds)("Make classes shareable");
builder.make_klasses_shareable();
char* serialized_data = dump_read_only_tables();
SystemDictionaryShared::adjust_lambda_proxy_class_dictionary();
// The vtable clones contain addresses of the current process.
// We don't want to write these addresses into the archive.
CppVtables::zero_archived_vtables();
// relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
// without runtime relocation.
builder.relocate_to_requested();
// Write the archive file
FileMapInfo* mapinfo = new FileMapInfo(true);
mapinfo->populate_header(MetaspaceShared::core_region_alignment());
mapinfo->set_serialized_data(serialized_data);
mapinfo->set_cloned_vtables(cloned_vtables);
mapinfo->open_for_write();
builder.write_archive(mapinfo,
_closed_archive_heap_regions,
_open_archive_heap_regions,
_closed_archive_heap_oopmaps,
_open_archive_heap_oopmaps);
if (PrintSystemDictionaryAtExit) {
SystemDictionary::print();
}
if (AllowArchivingWithJavaAgent) {
warning("This archive was created with AllowArchivingWithJavaAgent. It should be used "
"for testing purposes only and should not be used in a production environment");
}
// There may be pending VM operations. We have changed some global states
// (such as vmClasses::_klasses) that may cause these VM operations
// to fail. For safety, forget these operations and exit the VM directly.
vm_direct_exit(0);
}
class CollectCLDClosure : public CLDClosure {
GrowableArray<ClassLoaderData*> _loaded_cld;
public:
CollectCLDClosure() {}
~CollectCLDClosure() {
for (int i = 0; i < _loaded_cld.length(); i++) {
ClassLoaderData* cld = _loaded_cld.at(i);
cld->dec_keep_alive();
}
}
void do_cld(ClassLoaderData* cld) {
if (!cld->is_unloading()) {
cld->inc_keep_alive();
_loaded_cld.append(cld);
}
}
int nof_cld() const { return _loaded_cld.length(); }
ClassLoaderData* cld_at(int index) { return _loaded_cld.at(index); }
};
bool MetaspaceShared::linking_required(InstanceKlass* ik) {
// For static CDS dump, do not link old classes.
// For dynamic CDS dump, only link classes loaded by the builtin class loaders.
return DumpSharedSpaces ? !ik->can_be_verified_at_dumptime() : !ik->is_shared_unregistered_class();
}
bool MetaspaceShared::link_class_for_cds(InstanceKlass* ik, TRAPS) {
// Link the class to cause the bytecodes to be rewritten and the
// cpcache to be created. Class verification is done according
// to -Xverify setting.
bool res = MetaspaceShared::try_link_class(THREAD, ik);
if (DumpSharedSpaces) {
// The following function is used to resolve all Strings in the statically
// dumped classes to archive all the Strings. The archive heap is not supported
// for the dynamic archive.
ik->constants()->resolve_class_constants(CHECK_(false)); // may throw OOM when interning strings.
}
return res;
}
void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
// Collect all loaded ClassLoaderData.
ResourceMark rm;
LambdaFormInvokers::regenerate_holder_classes(CHECK);
CollectCLDClosure collect_cld;
{
// ClassLoaderDataGraph::loaded_cld_do requires ClassLoaderDataGraph_lock.
// We cannot link the classes while holding this lock (or else we may run into deadlock).
// Therefore, we need to first collect all the CLDs, and then link their classes after
// releasing the lock.
MutexLocker lock(ClassLoaderDataGraph_lock);
ClassLoaderDataGraph::loaded_cld_do(&collect_cld);
}
while (true) {
bool has_linked = false;
for (int i = 0; i < collect_cld.nof_cld(); i++) {
ClassLoaderData* cld = collect_cld.cld_at(i);
for (Klass* klass = cld->klasses(); klass != NULL; klass = klass->next_link()) {
if (klass->is_instance_klass()) {
InstanceKlass* ik = InstanceKlass::cast(klass);
if (linking_required(ik)) {
has_linked |= link_class_for_cds(ik, CHECK);
}
}
}
}
if (!has_linked) {
break;
}
// Class linking includes verification which may load more classes.
// Keep scanning until we have linked no more classes.
}
}
void MetaspaceShared::prepare_for_dumping() {
Arguments::assert_is_dumping_archive();
Arguments::check_unsupported_dumping_properties();
ClassLoader::initialize_shared_path(JavaThread::current());
}
// Preload classes from a list, populate the shared spaces and dump to a
// file.
void MetaspaceShared::preload_and_dump() {
EXCEPTION_MARK;
ResourceMark rm(THREAD);
preload_and_dump_impl(THREAD);
if (HAS_PENDING_EXCEPTION) {
if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
vm_direct_exit(-1, err_msg("Out of memory. Please run with a larger Java heap, current MaxHeapSize = "
SIZE_FORMAT "M", MaxHeapSize/M));
} else {
log_error(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(),
java_lang_String::as_utf8_string(java_lang_Throwable::message(PENDING_EXCEPTION)));
vm_direct_exit(-1, "VM exits due to exception, use -Xlog:cds,exceptions=trace for detail");
}
} else {
// On success, the VM_PopulateDumpSharedSpace op should have
// exited the VM.
ShouldNotReachHere();
}
}
void MetaspaceShared::preload_classes(TRAPS) {
char default_classlist[JVM_MAXPATHLEN];
const char* classlist_path;
if (SharedClassListFile == NULL) {
// 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)
os::jvm_path(default_classlist, sizeof(default_classlist));
for (int i = 0; i < 3; i++) {
char *end = strrchr(default_classlist, *os::file_separator());
if (end != NULL) *end = '\0';
}
int classlist_path_len = (int)strlen(default_classlist);
if (classlist_path_len >= 3) {
if (strcmp(default_classlist + classlist_path_len - 3, "lib") != 0) {
if (classlist_path_len < JVM_MAXPATHLEN - 4) {
jio_snprintf(default_classlist + classlist_path_len,
sizeof(default_classlist) - classlist_path_len,
"%slib", os::file_separator());
classlist_path_len += 4;
}
}
}
if (classlist_path_len < JVM_MAXPATHLEN - 10) {
jio_snprintf(default_classlist + classlist_path_len,
sizeof(default_classlist) - classlist_path_len,
"%sclasslist", os::file_separator());
}
classlist_path = default_classlist;
} else {
classlist_path = SharedClassListFile;
}
log_info(cds)("Loading classes to share ...");
_has_error_classes = false;
int class_count = parse_classlist(classlist_path, CHECK);
if (ExtraSharedClassListFile) {
class_count += parse_classlist(ExtraSharedClassListFile, CHECK);
}
// Exercise the manifest processing code to ensure classes used by CDS at runtime
// are always archived
const char* dummy = "Manifest-Version: 1.0\n";
SystemDictionaryShared::create_jar_manifest(dummy, strlen(dummy), CHECK);
log_info(cds)("Loading classes to share: done.");
log_info(cds)("Shared spaces: preloaded %d classes", class_count);
}
void MetaspaceShared::preload_and_dump_impl(TRAPS) {
preload_classes(CHECK);
if (SharedArchiveConfigFile) {
log_info(cds)("Reading extra data from %s ...", SharedArchiveConfigFile);
read_extra_data(THREAD, SharedArchiveConfigFile);
log_info(cds)("Reading extra data: done.");
}
HeapShared::init_for_dumping(CHECK);
// Rewrite and link classes
log_info(cds)("Rewriting and linking classes ...");
// Link any classes which got missed. This would happen if we have loaded classes that
// were not explicitly specified in the classlist. E.g., if an interface implemented by class K
// fails verification, all other interfaces that were not specified in the classlist but
// are implemented by K are not verified.
link_and_cleanup_shared_classes(CHECK);
log_info(cds)("Rewriting and linking classes: done");
#if INCLUDE_CDS_JAVA_HEAP
if (use_full_module_graph()) {
HeapShared::reset_archived_object_states(CHECK);
}
#endif
VM_PopulateDumpSharedSpace op;
VMThread::execute(&op);
}
int MetaspaceShared::parse_classlist(const char* classlist_path, TRAPS) {
ClassListParser parser(classlist_path);
return parser.parse(THREAD); // returns the number of classes loaded.
}
// Returns true if the class's status has changed.
bool MetaspaceShared::try_link_class(JavaThread* current, InstanceKlass* ik) {
ExceptionMark em(current);
JavaThread* THREAD = current; // For exception macros.
Arguments::assert_is_dumping_archive();
if (ik->is_loaded() && !ik->is_linked() && !ik->can_be_verified_at_dumptime() &&
!SystemDictionaryShared::has_class_failed_verification(ik)) {
bool saved = BytecodeVerificationLocal;
if (ik->is_shared_unregistered_class() && ik->class_loader() == NULL) {
// The verification decision is based on BytecodeVerificationRemote
// for non-system classes. Since we are using the NULL classloader
// to load non-system classes for customized class loaders during dumping,
// we need to temporarily change BytecodeVerificationLocal to be the same as
// BytecodeVerificationRemote. Note this can cause the parent system
// classes also being verified. The extra overhead is acceptable during
// dumping.
BytecodeVerificationLocal = BytecodeVerificationRemote;
}
ik->link_class(THREAD);
if (HAS_PENDING_EXCEPTION) {
ResourceMark rm(THREAD);
log_warning(cds)("Preload Warning: Verification failed for %s",
ik->external_name());
CLEAR_PENDING_EXCEPTION;
SystemDictionaryShared::set_class_has_failed_verification(ik);
_has_error_classes = true;
}
BytecodeVerificationLocal = saved;
return true;
} else {
return false;
}
}
#if INCLUDE_CDS_JAVA_HEAP
void VM_PopulateDumpSharedSpace::dump_java_heap_objects(GrowableArray<Klass*>* klasses) {
if(!HeapShared::is_heap_object_archiving_allowed()) {
log_info(cds)(
"Archived java heap is not supported as UseG1GC, "
"UseCompressedOops and UseCompressedClassPointers are required."
"Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.",
BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
BOOL_TO_STR(UseCompressedClassPointers));
return;
}
// Find all the interned strings that should be dumped.
int i;
for (i = 0; i < klasses->length(); i++) {
Klass* k = klasses->at(i);
if (k->is_instance_klass()) {
InstanceKlass* ik = InstanceKlass::cast(k);
if (ik->is_linked()) {
ik->constants()->add_dumped_interned_strings();
}
}
}
if (_extra_interned_strings != NULL) {
for (i = 0; i < _extra_interned_strings->length(); i ++) {
OopHandle string = _extra_interned_strings->at(i);
HeapShared::add_to_dumped_interned_strings(string.resolve());
}
}
// The closed and open archive heap space has maximum two regions.
// See FileMapInfo::write_archive_heap_regions() for details.
_closed_archive_heap_regions = new GrowableArray<MemRegion>(2);
_open_archive_heap_regions = new GrowableArray<MemRegion>(2);
HeapShared::archive_java_heap_objects(_closed_archive_heap_regions,
_open_archive_heap_regions);
ArchiveBuilder::OtherROAllocMark mark;
HeapShared::write_subgraph_info_table();
}
void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() {
if (HeapShared::is_heap_object_archiving_allowed()) {
_closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps);
_open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2);
dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps);
}
}
void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions,
GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) {
for (int i=0; i<regions->length(); i++) {
ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i));
size_t size_in_bits = oopmap.size();
size_t size_in_bytes = oopmap.size_in_bytes();
uintptr_t* buffer = (uintptr_t*)NEW_C_HEAP_ARRAY(char, size_in_bytes, mtInternal);
oopmap.write_to(buffer, size_in_bytes);
log_info(cds, heap)("Oopmap = " INTPTR_FORMAT " (" SIZE_FORMAT_W(6) " bytes) for heap region "
INTPTR_FORMAT " (" SIZE_FORMAT_W(8) " bytes)",
p2i(buffer), size_in_bytes,
p2i(regions->at(i).start()), regions->at(i).byte_size());
ArchiveHeapOopmapInfo info;
info._oopmap = (address)buffer;
info._oopmap_size_in_bits = size_in_bits;
info._oopmap_size_in_bytes = size_in_bytes;
oopmaps->append(info);
}
}
#endif // INCLUDE_CDS_JAVA_HEAP
void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
assert(base <= static_top && static_top <= top, "must be");
_shared_metaspace_static_top = static_top;
MetaspaceObj::set_shared_metaspace_range(base, top);
}
// Return true if given address is in the misc data region
bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
}
bool MetaspaceShared::is_shared_dynamic(void* p) {
if ((p < MetaspaceObj::shared_metaspace_top()) &&
(p >= _shared_metaspace_static_top)) {
return true;
} else {
return false;
}
}
void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled");
MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
FileMapInfo* static_mapinfo = open_static_archive();
FileMapInfo* dynamic_mapinfo = NULL;
if (static_mapinfo != NULL) {
log_info(cds)("Core region alignment: " SIZE_FORMAT, static_mapinfo->core_region_alignment());
dynamic_mapinfo = open_dynamic_archive();
// First try to map at the requested address
result = map_archives(static_mapinfo, dynamic_mapinfo, true);
if (result == MAP_ARCHIVE_MMAP_FAILURE) {
// Mapping has failed (probably due to ASLR). Let's map at an address chosen
// by the OS.
log_info(cds)("Try to map archive(s) at an alternative address");
result = map_archives(static_mapinfo, dynamic_mapinfo, false);
}
}
if (result == MAP_ARCHIVE_SUCCESS) {
bool dynamic_mapped = (dynamic_mapinfo != NULL && dynamic_mapinfo->is_mapped());
char* cds_base = static_mapinfo->mapped_base();
char* cds_end = dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
_relocation_delta = static_mapinfo->relocation_delta();
_requested_base_address = static_mapinfo->requested_base_address();
if (dynamic_mapped) {
FileMapInfo::set_shared_path_table(dynamic_mapinfo);
} else {
FileMapInfo::set_shared_path_table(static_mapinfo);
}
} else {
set_shared_metaspace_range(NULL, NULL, NULL);
UseSharedSpaces = false;
FileMapInfo::fail_continue("Unable to map shared spaces");
if (PrintSharedArchiveAndExit) {
vm_exit_during_initialization("Unable to use shared archive.");
}
}
if (static_mapinfo != NULL && !static_mapinfo->is_mapped()) {
delete static_mapinfo;
}
if (dynamic_mapinfo != NULL && !dynamic_mapinfo->is_mapped()) {
delete dynamic_mapinfo;
}
}
FileMapInfo* MetaspaceShared::open_static_archive() {
FileMapInfo* mapinfo = new FileMapInfo(true);
if (!mapinfo->initialize()) {
delete(mapinfo);
return NULL;
}
return mapinfo;
}
FileMapInfo* MetaspaceShared::open_dynamic_archive() {
if (DynamicDumpSharedSpaces) {
return NULL;
}
if (Arguments::GetSharedDynamicArchivePath() == NULL) {
return NULL;
}
FileMapInfo* mapinfo = new FileMapInfo(false);
if (!mapinfo->initialize()) {
delete(mapinfo);
return NULL;
}
return mapinfo;
}
// use_requested_addr:
// true = map at FileMapHeader::_requested_base_address
// false = map at an alternative address picked by OS.
MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
bool use_requested_addr) {
if (use_requested_addr && static_mapinfo->requested_base_address() == NULL) {
log_info(cds)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
return MAP_ARCHIVE_MMAP_FAILURE;
}
PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
// For product build only -- this is for benchmarking the cost of doing relocation.
// For debug builds, the check is done below, after reserving the space, for better test coverage
// (see comment below).
log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
return MAP_ARCHIVE_MMAP_FAILURE;
});
if (ArchiveRelocationMode == 2 && !use_requested_addr) {
log_info(cds)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
return MAP_ARCHIVE_MMAP_FAILURE;
};
if (dynamic_mapinfo != NULL) {
// Ensure that the OS won't be able to allocate new memory spaces between the two
// archives, or else it would mess up the simple comparision in MetaspaceObj::is_shared().
assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
}
ReservedSpace total_space_rs, archive_space_rs, class_space_rs;
MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo,
dynamic_mapinfo,
use_requested_addr,
total_space_rs,
archive_space_rs,
class_space_rs);
if (mapped_base_address == NULL) {
result = MAP_ARCHIVE_MMAP_FAILURE;
log_debug(cds)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
} else {
#ifdef ASSERT
// Some sanity checks after reserving address spaces for archives
// and class space.
assert(archive_space_rs.is_reserved(), "Sanity");
if (Metaspace::using_class_space()) {
// Class space must closely follow the archive space. Both spaces
// must be aligned correctly.
assert(class_space_rs.is_reserved(),
"A class space should have been reserved");
assert(class_space_rs.base() >= archive_space_rs.end(),
"class space should follow the cds archive space");