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8238358: Implementation of JEP 371: Hidden Classes

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Co-authored-by: Lois Foltan <lois.foltan@oracle.com>
Co-authored-by: David Holmes <david.holmes@oracle.com>
Co-authored-by: Harold Seigel <harold.seigel@oracle.com>
Co-authored-by: Serguei Spitsyn <serguei.spitsyn@oracle.com>
Co-authored-by: Alex Buckley <alex.buckley@oracle.com>
Co-authored-by: Jamsheed Mohammed C M <jamsheed.c.m@oracle.com>
Co-authored-by: Jan Lahoda <jan.lahoda@oracle.com>
Co-authored-by: Amy Lu <amy.lu@oracle.com>
Reviewed-by: alanb, cjplummer, coleenp, dholmes, dlong, forax, jlahoda, psandoz, plevart, sspitsyn, vromero
This commit is contained in:
Mandy Chung 2020-04-21 06:55:38 -07:00
parent 642041adbc
commit 7cc1371059
198 changed files with 9526 additions and 1575 deletions
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74
src/hotspot/share/classfile/classLoaderData.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2020, 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
@ -126,16 +126,16 @@ void ClassLoaderData::initialize_name(Handle class_loader) {
_name_and_id = SymbolTable::new_symbol(cl_instance_name_and_id);
}
ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_unsafe_anonymous) :
ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool has_class_mirror_holder) :
_metaspace(NULL),
_metaspace_lock(new Mutex(Mutex::leaf+1, "Metaspace allocation lock", true,
Mutex::_safepoint_check_never)),
_unloading(false), _is_unsafe_anonymous(is_unsafe_anonymous),
_unloading(false), _has_class_mirror_holder(has_class_mirror_holder),
_modified_oops(true), _accumulated_modified_oops(false),
// An unsafe anonymous class loader data doesn't have anything to keep
// it from being unloaded during parsing of the unsafe anonymous class.
// The null-class-loader should always be kept alive.
_keep_alive((is_unsafe_anonymous || h_class_loader.is_null()) ? 1 : 0),
_keep_alive((has_class_mirror_holder || h_class_loader.is_null()) ? 1 : 0),
_claim(0),
_handles(),
_klasses(NULL), _packages(NULL), _modules(NULL), _unnamed_module(NULL), _dictionary(NULL),
@ -150,13 +150,13 @@ ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_unsafe_anonymous
initialize_name(h_class_loader);
}
if (!is_unsafe_anonymous) {
// The holder is initialized later for unsafe anonymous classes, and before calling anything
// that call class_loader().
if (!has_class_mirror_holder) {
// The holder is initialized later for non-strong hidden classes and unsafe anonymous classes,
// and before calling anything that call class_loader().
initialize_holder(h_class_loader);
// A ClassLoaderData created solely for an unsafe anonymous class should never have a
// ModuleEntryTable or PackageEntryTable created for it. The defining package
// A ClassLoaderData created solely for a non-strong hidden class or unsafe anonymous class should
// never have a ModuleEntryTable or PackageEntryTable created for it. The defining package
// and module for an unsafe anonymous class will be found in its host class.
_packages = new PackageEntryTable(PackageEntryTable::_packagetable_entry_size);
if (h_class_loader.is_null()) {
@ -291,20 +291,20 @@ bool ClassLoaderData::try_claim(int claim) {
}
}
// Unsafe anonymous classes have their own ClassLoaderData that is marked to keep alive
// Weak hidden and unsafe anonymous classes have their own ClassLoaderData that is marked to keep alive
// while the class is being parsed, and if the class appears on the module fixup list.
// Due to the uniqueness that no other class shares the unsafe anonymous class' name or
// ClassLoaderData, no other non-GC thread has knowledge of the unsafe anonymous class while
// Due to the uniqueness that no other class shares the hidden or unsafe anonymous class' name or
// ClassLoaderData, no other non-GC thread has knowledge of the hidden or unsafe anonymous class while
// it is being defined, therefore _keep_alive is not volatile or atomic.
void ClassLoaderData::inc_keep_alive() {
if (is_unsafe_anonymous()) {
if (has_class_mirror_holder()) {
assert(_keep_alive > 0, "Invalid keep alive increment count");
_keep_alive++;
}
}
void ClassLoaderData::dec_keep_alive() {
if (is_unsafe_anonymous()) {
if (has_class_mirror_holder()) {
assert(_keep_alive > 0, "Invalid keep alive decrement count");
_keep_alive--;
}
@ -410,21 +410,21 @@ void ClassLoaderData::record_dependency(const Klass* k) {
// Do not need to record dependency if the dependency is to a class whose
// class loader data is never freed. (i.e. the dependency's class loader
// is one of the three builtin class loaders and the dependency is not
// unsafe anonymous.)
// is one of the three builtin class loaders and the dependency's class
// loader data has a ClassLoader holder, not a Class holder.)
if (to_cld->is_permanent_class_loader_data()) {
return;
}
oop to;
if (to_cld->is_unsafe_anonymous()) {
// Just return if an unsafe anonymous class is attempting to record a dependency
// to itself. (Note that every unsafe anonymous class has its own unique class
if (to_cld->has_class_mirror_holder()) {
// Just return if a non-strong hidden class or unsafe anonymous class is attempting to record a dependency
// to itself. (Note that every non-strong hidden class or unsafe anonymous class has its own unique class
// loader data.)
if (to_cld == from_cld) {
return;
}
// Unsafe anonymous class dependencies are through the mirror.
// Hidden and unsafe anonymous class dependencies are through the mirror.
to = k->java_mirror();
} else {
to = to_cld->class_loader();
@ -572,7 +572,7 @@ const int _boot_loader_dictionary_size = 1009;
const int _default_loader_dictionary_size = 107;
Dictionary* ClassLoaderData::create_dictionary() {
assert(!is_unsafe_anonymous(), "unsafe anonymous class loader data do not have a dictionary");
assert(!has_class_mirror_holder(), "class mirror holder cld does not have a dictionary");
int size;
bool resizable = false;
if (_the_null_class_loader_data == NULL) {
@ -618,7 +618,7 @@ oop ClassLoaderData::holder_no_keepalive() const {
// Unloading support
bool ClassLoaderData::is_alive() const {
bool alive = keep_alive() // null class loader and incomplete unsafe anonymous klasses.
bool alive = keep_alive() // null class loader and incomplete non-strong hidden class or unsafe anonymous class.
|| (_holder.peek() != NULL); // and not cleaned by the GC weak handle processing.
return alive;
@ -716,13 +716,13 @@ ClassLoaderData::~ClassLoaderData() {
// Returns true if this class loader data is for the app class loader
// or a user defined system class loader. (Note that the class loader
// data may be unsafe anonymous.)
// data may have a Class holder.)
bool ClassLoaderData::is_system_class_loader_data() const {
return SystemDictionary::is_system_class_loader(class_loader());
}
// Returns true if this class loader data is for the platform class loader.
// (Note that the class loader data may be unsafe anonymous.)
// (Note that the class loader data may have a Class holder.)
bool ClassLoaderData::is_platform_class_loader_data() const {
return SystemDictionary::is_platform_class_loader(class_loader());
}
@ -730,8 +730,8 @@ bool ClassLoaderData::is_platform_class_loader_data() const {
// Returns true if the class loader for this class loader data is one of
// the 3 builtin (boot application/system or platform) class loaders,
// including a user-defined system class loader. Note that if the class
// loader data is for an unsafe anonymous class then it may get freed by a GC
// even if its class loader is one of these loaders.
// loader data is for a non-strong hidden class or unsafe anonymous class then it may
// get freed by a GC even if its class loader is one of these loaders.
bool ClassLoaderData::is_builtin_class_loader_data() const {
return (is_boot_class_loader_data() ||
SystemDictionary::is_system_class_loader(class_loader()) ||
@ -740,9 +740,9 @@ bool ClassLoaderData::is_builtin_class_loader_data() const {
// Returns true if this class loader data is a class loader data
// that is not ever freed by a GC. It must be the CLD for one of the builtin
// class loaders and not the CLD for an unsafe anonymous class.
// class loaders and not the CLD for a non-strong hidden class or unsafe anonymous class.
bool ClassLoaderData::is_permanent_class_loader_data() const {
return is_builtin_class_loader_data() && !is_unsafe_anonymous();
return is_builtin_class_loader_data() && !has_class_mirror_holder();
}
ClassLoaderMetaspace* ClassLoaderData::metaspace_non_null() {
@ -759,8 +759,8 @@ ClassLoaderMetaspace* ClassLoaderData::metaspace_non_null() {
if (this == the_null_class_loader_data()) {
assert (class_loader() == NULL, "Must be");
metaspace = new ClassLoaderMetaspace(_metaspace_lock, Metaspace::BootMetaspaceType);
} else if (is_unsafe_anonymous()) {
metaspace = new ClassLoaderMetaspace(_metaspace_lock, Metaspace::UnsafeAnonymousMetaspaceType);
} else if (has_class_mirror_holder()) {
metaspace = new ClassLoaderMetaspace(_metaspace_lock, Metaspace::ClassMirrorHolderMetaspaceType);
} else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) {
metaspace = new ClassLoaderMetaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType);
} else {
@ -877,8 +877,8 @@ void ClassLoaderData::free_deallocate_list_C_heap_structures() {
}
}
// These CLDs are to contain unsafe anonymous classes used for JSR292
ClassLoaderData* ClassLoaderData::unsafe_anonymous_class_loader_data(Handle loader) {
// These CLDs are to contain non-strong hidden classes or unsafe anonymous classes used for JSR292
ClassLoaderData* ClassLoaderData::has_class_mirror_holder_cld(Handle loader) {
// Add a new class loader data to the graph.
return ClassLoaderDataGraph::add(loader, true);
}
@ -920,8 +920,8 @@ void ClassLoaderData::print_value_on(outputStream* out) const {
// loader data: 0xsomeaddr of 'bootstrap'
out->print("loader data: " INTPTR_FORMAT " of %s", p2i(this), loader_name_and_id());
}
if (is_unsafe_anonymous()) {
out->print(" unsafe anonymous");
if (_has_class_mirror_holder) {
out->print(" has a class holder");
}
}
@ -931,7 +931,7 @@ void ClassLoaderData::print_value() const { print_value_on(tty); }
void ClassLoaderData::print_on(outputStream* out) const {
out->print("ClassLoaderData CLD: " PTR_FORMAT ", loader: " PTR_FORMAT ", loader_klass: %s {",
p2i(this), p2i(_class_loader.ptr_raw()), loader_name_and_id());
if (is_unsafe_anonymous()) out->print(" unsafe anonymous");
if (has_class_mirror_holder()) out->print(" has a class holder");
if (claimed()) out->print(" claimed");
if (is_unloading()) out->print(" unloading");
out->print(" metaspace: " INTPTR_FORMAT, p2i(metaspace_or_null()));
@ -951,8 +951,8 @@ void ClassLoaderData::verify() {
assert_locked_or_safepoint(_metaspace_lock);
oop cl = class_loader();
guarantee(this == class_loader_data(cl) || is_unsafe_anonymous(), "Must be the same");
guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_unsafe_anonymous(), "must be");
guarantee(this == class_loader_data(cl) || has_class_mirror_holder(), "Must be the same");
guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || has_class_mirror_holder(), "must be");
// Verify the integrity of the allocated space.
if (metaspace_or_null() != NULL) {