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jdk/src/hotspot/share/oops/cpCache.cpp
Ioi Lam 41a2d49f0a 8331497: Implement JEP 483: Ahead-of-Time Class Loading & Linking 
Reviewed-by: jrose, kvn, heidinga, asmehra, vlivanov
2024-11-15 22:28:54 +00:00

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/*
* Copyright (c) 1998, 2024, 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 "cds/aotConstantPoolResolver.hpp"
#include "cds/archiveBuilder.hpp"
#include "cds/cdsConfig.hpp"
#include "cds/heapShared.hpp"
#include "classfile/resolutionErrors.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/systemDictionaryShared.hpp"
#include "classfile/vmClasses.hpp"
#include "code/codeCache.hpp"
#include "interpreter/bytecodeStream.hpp"
#include "interpreter/bytecodes.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/linkResolver.hpp"
#include "interpreter/rewriter.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/metaspaceClosure.hpp"
#include "memory/resourceArea.hpp"
#include "oops/access.inline.hpp"
#include "oops/compressedOops.hpp"
#include "oops/constantPool.inline.hpp"
#include "oops/cpCache.inline.hpp"
#include "oops/method.inline.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/resolvedFieldEntry.hpp"
#include "oops/resolvedIndyEntry.hpp"
#include "oops/resolvedMethodEntry.hpp"
#include "prims/methodHandles.hpp"
#include "runtime/arguments.hpp"
#include "runtime/atomic.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/vm_version.hpp"
#include "utilities/macros.hpp"
// Implementation of ConstantPoolCache
template <class T>
static Array<T>* initialize_resolved_entries_array(ClassLoaderData* loader_data, GrowableArray<T> entries, TRAPS) {
Array<T>* resolved_entries;
if (entries.length() != 0) {
resolved_entries = MetadataFactory::new_array<T>(loader_data, entries.length(), CHECK_NULL);
for (int i = 0; i < entries.length(); i++) {
resolved_entries->at_put(i, entries.at(i));
}
return resolved_entries;
}
return nullptr;
}
void ConstantPoolCache::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
int method_index,
const methodHandle& method,
int vtable_index,
bool sender_is_interface) {
bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
assert(method->interpreter_entry() != nullptr, "should have been set at this point");
assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
int byte_no = -1;
bool change_to_virtual = false;
InstanceKlass* holder = nullptr; // have to declare this outside the switch
ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
switch (invoke_code) {
case Bytecodes::_invokeinterface:
holder = method->method_holder();
// check for private interface method invocations
if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) {
assert(method->is_private(), "unexpected non-private method");
assert(method->can_be_statically_bound(), "unexpected non-statically-bound method");
method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
assert(method_entry->is_vfinal(), "flags must be set");
method_entry->set_method(method());
byte_no = 2;
method_entry->set_klass(holder);
break;
}
else {
// We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
// instruction links to a non-interface method (in Object). This can happen when
// an interface redeclares an Object method (like CharSequence declaring toString())
// or when invokeinterface is used explicitly.
// In that case, the method has no itable index and must be invoked as a virtual.
// Set a flag to keep track of this corner case.
assert(holder->is_interface() || holder == vmClasses::Object_klass(), "unexpected holder class");
assert(method->is_public(), "Calling non-public method in Object with invokeinterface");
change_to_virtual = true;
// ...and fall through as if we were handling invokevirtual:
}
case Bytecodes::_invokevirtual:
{
if (!is_vtable_call) {
assert(method->can_be_statically_bound(), "");
method_entry->set_flags(( 1 << ResolvedMethodEntry::is_vfinal_shift) |
((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift) |
((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift));
method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
assert(method_entry->is_vfinal(), "flags must be set");
method_entry->set_method(method());
} else {
assert(!method->can_be_statically_bound(), "");
assert(vtable_index >= 0, "valid index");
assert(!method->is_final_method(), "sanity");
method_entry->set_flags((change_to_virtual ? 1 : 0) << ResolvedMethodEntry::is_forced_virtual_shift);
method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
assert(!method_entry->is_vfinal(), "flags must not be set");
method_entry->set_table_index(vtable_index);
}
byte_no = 2;
break;
}
case Bytecodes::_invokespecial:
case Bytecodes::_invokestatic: {
assert(!is_vtable_call, "");
// Note: Read and preserve the value of the is_vfinal flag on any
// invokevirtual bytecode shared with this constant pool cache entry.
// It is cheap and safe to consult is_vfinal() at all times.
// Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
bool vfinal = method_entry->is_vfinal();
method_entry->set_flags(((method->is_final_method() ? 1 : 0) << ResolvedMethodEntry::is_final_shift));
assert(vfinal == method_entry->is_vfinal(), "Vfinal flag must be preserved");
method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
method_entry->set_method(method());
byte_no = 1;
break;
}
default:
ShouldNotReachHere();
break;
}
// Note: byte_no also appears in TemplateTable::resolve.
if (byte_no == 1) {
assert(invoke_code != Bytecodes::_invokevirtual &&
invoke_code != Bytecodes::_invokeinterface, "");
bool do_resolve = true;
// Don't mark invokespecial to method as resolved if sender is an interface. The receiver
// has to be checked that it is a subclass of the current class every time this bytecode
// is executed.
if (invoke_code == Bytecodes::_invokespecial && sender_is_interface &&
method->name() != vmSymbols::object_initializer_name()) {
do_resolve = false;
}
if (invoke_code == Bytecodes::_invokestatic) {
assert(method->method_holder()->is_initialized() ||
method->method_holder()->is_reentrant_initialization(JavaThread::current()),
"invalid class initialization state for invoke_static");
if (!VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
// Don't mark invokestatic to method as resolved if the holder class has not yet completed
// initialization. An invokestatic must only proceed if the class is initialized, but if
// we resolve it before then that class initialization check is skipped.
//
// When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
// template interpreter supports fast class initialization check for
// invokestatic which doesn't require call site re-resolution to
// enforce class initialization barrier.
do_resolve = false;
}
}
if (do_resolve) {
method_entry->set_bytecode1(invoke_code);
}
} else if (byte_no == 2) {
if (change_to_virtual) {
assert(invoke_code == Bytecodes::_invokeinterface, "");
// NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
//
// Workaround for the case where we encounter an invokeinterface, but we
// should really have an _invokevirtual since the resolved method is a
// virtual method in java.lang.Object. This is a corner case in the spec
// but is presumably legal. javac does not generate this code.
//
// We do not set bytecode_1() to _invokeinterface, because that is the
// bytecode # used by the interpreter to see if it is resolved. In this
// case, the method gets reresolved with caller for each interface call
// because the actual selected method may not be public.
//
// We set bytecode_2() to _invokevirtual.
// See also interpreterRuntime.cpp. (8/25/2000)
} else {
assert(invoke_code == Bytecodes::_invokevirtual ||
(invoke_code == Bytecodes::_invokeinterface &&
((method->is_private() ||
(method->is_final() && method->method_holder() == vmClasses::Object_klass())))),
"unexpected invocation mode");
if (invoke_code == Bytecodes::_invokeinterface &&
(method->is_private() || method->is_final())) {
// We set bytecode_1() to _invokeinterface, because that is the
// bytecode # used by the interpreter to see if it is resolved.
// We set bytecode_2() to _invokevirtual.
method_entry->set_bytecode1(invoke_code);
}
}
// set up for invokevirtual, even if linking for invokeinterface also:
method_entry->set_bytecode2(Bytecodes::_invokevirtual);
} else {
ShouldNotReachHere();
}
}
void ConstantPoolCache::set_direct_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method,
bool sender_is_interface) {
int index = Method::nonvirtual_vtable_index;
// index < 0; FIXME: inline and customize set_direct_or_vtable_call
set_direct_or_vtable_call(invoke_code, method_index, method, index, sender_is_interface);
}
void ConstantPoolCache::set_vtable_call(Bytecodes::Code invoke_code, int method_index, const methodHandle& method, int index) {
// either the method is a miranda or its holder should accept the given index
assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
// index >= 0; FIXME: inline and customize set_direct_or_vtable_call
set_direct_or_vtable_call(invoke_code, method_index, method, index, false);
}
void ConstantPoolCache::set_itable_call(Bytecodes::Code invoke_code,
int method_index,
Klass* referenced_klass,
const methodHandle& method, int index) {
assert(method->method_holder()->verify_itable_index(index), "");
assert(invoke_code == Bytecodes::_invokeinterface, "");
InstanceKlass* interf = method->method_holder();
assert(interf->is_interface(), "must be an interface");
assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
method_entry->set_klass(static_cast<InstanceKlass*>(referenced_klass));
method_entry->set_method(method());
method_entry->fill_in((u1)as_TosState(method->result_type()), (u2)method()->size_of_parameters());
method_entry->set_bytecode1(Bytecodes::_invokeinterface);
}
ResolvedMethodEntry* ConstantPoolCache::set_method_handle(int method_index, const CallInfo &call_info) {
// NOTE: This method entry can be the subject of data races.
// There are three words to update: flags, refs[appendix_index], method (in that order).
// Writers must store all other values before method.
// Readers must test the method first for non-null before reading other fields.
// Competing writers must acquire exclusive access via a lock.
// A losing writer waits on the lock until the winner writes the method and leaves
// the lock, so that when the losing writer returns, he can use the linked
// cache entry.
// Lock fields to write
Bytecodes::Code invoke_code = Bytecodes::_invokehandle;
JavaThread* current = JavaThread::current();
objArrayHandle resolved_references(current, constant_pool()->resolved_references());
// Use the resolved_references() lock for this cpCache entry.
// resolved_references are created for all classes with Invokedynamic, MethodHandle
// or MethodType constant pool cache entries.
assert(resolved_references() != nullptr,
"a resolved_references array should have been created for this class");
ObjectLocker ol(resolved_references, current);
ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
if (method_entry->is_resolved(invoke_code)) {
return method_entry;
}
Method* adapter = call_info.resolved_method();
const Handle appendix = call_info.resolved_appendix();
const bool has_appendix = appendix.not_null();
// Write the flags.
// MHs are always sig-poly and have a local signature.
method_entry->fill_in((u1)as_TosState(adapter->result_type()), (u2)adapter->size_of_parameters());
method_entry->set_flags(((has_appendix ? 1 : 0) << ResolvedMethodEntry::has_appendix_shift ) |
( 1 << ResolvedMethodEntry::has_local_signature_shift ) |
( 1 << ResolvedMethodEntry::is_final_shift ));
// Method handle invokes use both a method and a resolved references index.
// refs[appendix_index], if not null, contains a value passed as a trailing argument to the adapter.
// In the general case, this could be the call site's MethodType,
// for use with java.lang.Invokers.checkExactType, or else a CallSite object.
// method_entry->method() contains the adapter method which manages the actual call.
// In the general case, this is a compiled LambdaForm.
// (The Java code is free to optimize these calls by binding other
// sorts of methods and appendices to call sites.)
// JVM-level linking is via the method, as if for invokespecial, and signatures are erased.
// The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
// Even with the appendix, the method will never take more than 255 parameter slots.
//
// This means that given a call site like (List)mh.invoke("foo"),
// the method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
// not '(Ljava/lang/String;)Ljava/util/List;'.
// The fact that String and List are involved is encoded in the MethodType in refs[appendix_index].
// This allows us to create fewer Methods, while keeping type safety.
//
// Store appendix, if any.
if (has_appendix) {
const int appendix_index = method_entry->resolved_references_index();
assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
resolved_references->obj_at_put(appendix_index, appendix());
}
method_entry->set_method(adapter); // This must be the last one to set (see NOTE above)!
// The interpreter assembly code does not check byte_2,
// but it is used by is_resolved, method_if_resolved, etc.
method_entry->set_bytecode1(invoke_code);
assert(has_appendix == method_entry->has_appendix(), "proper storage of appendix flag");
assert(method_entry->has_local_signature(), "proper storage of signature flag");
return method_entry;
}
Method* ConstantPoolCache::method_if_resolved(int method_index) const {
// Decode the action of set_method and set_interface_call
ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
Bytecodes::Code invoke_code = (Bytecodes::Code)method_entry->bytecode1();
switch (invoke_code) {
case Bytecodes::_invokeinterface:
case Bytecodes::_invokestatic:
case Bytecodes::_invokespecial:
assert(!method_entry->has_appendix(), "");
// fall through
case Bytecodes::_invokehandle:
return method_entry->method();
case Bytecodes::_invokedynamic:
ShouldNotReachHere();
default:
assert(invoke_code == (Bytecodes::Code)0, "unexpected bytecode");
break;
}
invoke_code = (Bytecodes::Code)method_entry->bytecode2();
if (invoke_code == Bytecodes::_invokevirtual) {
if (method_entry->is_vfinal()) {
return method_entry->method();
} else {
int holder_index = constant_pool()->uncached_klass_ref_index_at(method_entry->constant_pool_index());
if (constant_pool()->tag_at(holder_index).is_klass()) {
Klass* klass = constant_pool()->resolved_klass_at(holder_index);
return klass->method_at_vtable(method_entry->table_index());
}
}
}
return nullptr;
}
ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
const intStack& invokedynamic_map,
const GrowableArray<ResolvedIndyEntry> indy_entries,
const GrowableArray<ResolvedFieldEntry> field_entries,
const GrowableArray<ResolvedMethodEntry> method_entries,
TRAPS) {
int size = ConstantPoolCache::size();
// Initialize resolved entry arrays with available data
Array<ResolvedFieldEntry>* resolved_field_entries = initialize_resolved_entries_array(loader_data, field_entries, CHECK_NULL);
Array<ResolvedIndyEntry>* resolved_indy_entries = initialize_resolved_entries_array(loader_data, indy_entries, CHECK_NULL);
Array<ResolvedMethodEntry>* resolved_method_entries = initialize_resolved_entries_array(loader_data, method_entries, CHECK_NULL);
return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD)
ConstantPoolCache(invokedynamic_map, resolved_indy_entries, resolved_field_entries, resolved_method_entries);
}
// Record the GC marking cycle when redefined vs. when found in the loom stack chunks.
void ConstantPoolCache::record_gc_epoch() {
_gc_epoch = CodeCache::gc_epoch();
}
#if INCLUDE_CDS
void ConstantPoolCache::remove_unshareable_info() {
assert(CDSConfig::is_dumping_archive(), "sanity");
if (_resolved_indy_entries != nullptr) {
remove_resolved_indy_entries_if_non_deterministic();
}
if (_resolved_field_entries != nullptr) {
remove_resolved_field_entries_if_non_deterministic();
}
if (_resolved_method_entries != nullptr) {
remove_resolved_method_entries_if_non_deterministic();
}
}
void ConstantPoolCache::remove_resolved_field_entries_if_non_deterministic() {
ConstantPool* cp = constant_pool();
ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
for (int i = 0; i < _resolved_field_entries->length(); i++) {
ResolvedFieldEntry* rfi = _resolved_field_entries->adr_at(i);
int cp_index = rfi->constant_pool_index();
bool archived = false;
bool resolved = rfi->is_resolved(Bytecodes::_getfield) ||
rfi->is_resolved(Bytecodes::_putfield);
if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
rfi->mark_and_relocate();
archived = true;
} else {
rfi->remove_unshareable_info();
}
if (resolved) {
LogStreamHandle(Trace, cds, resolve) log;
if (log.is_enabled()) {
ResourceMark rm;
int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
Symbol* klass_name = cp->klass_name_at(klass_cp_index);
Symbol* name = cp->uncached_name_ref_at(cp_index);
Symbol* signature = cp->uncached_signature_ref_at(cp_index);
log.print("%s field CP entry [%3d]: %s => %s.%s:%s",
(archived ? "archived" : "reverted"),
cp_index,
cp->pool_holder()->name()->as_C_string(),
klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
}
}
ArchiveBuilder::alloc_stats()->record_field_cp_entry(archived, resolved && !archived);
}
}
void ConstantPoolCache::remove_resolved_method_entries_if_non_deterministic() {
ConstantPool* cp = constant_pool();
ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
for (int i = 0; i < _resolved_method_entries->length(); i++) {
ResolvedMethodEntry* rme = _resolved_method_entries->adr_at(i);
int cp_index = rme->constant_pool_index();
bool archived = false;
bool resolved = rme->is_resolved(Bytecodes::_invokevirtual) ||
rme->is_resolved(Bytecodes::_invokespecial) ||
rme->is_resolved(Bytecodes::_invokeinterface) ||
rme->is_resolved(Bytecodes::_invokehandle);
// Just for safety -- this should not happen, but do not archive if we ever see this.
resolved &= !(rme->is_resolved(Bytecodes::_invokestatic));
if (resolved && can_archive_resolved_method(src_cp, rme)) {
rme->mark_and_relocate(src_cp);
archived = true;
} else {
rme->remove_unshareable_info();
}
if (resolved) {
LogStreamHandle(Trace, cds, resolve) log;
if (log.is_enabled()) {
ResourceMark rm;
int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
Symbol* klass_name = cp->klass_name_at(klass_cp_index);
Symbol* name = cp->uncached_name_ref_at(cp_index);
Symbol* signature = cp->uncached_signature_ref_at(cp_index);
log.print("%s%s method CP entry [%3d]: %s %s.%s:%s",
(archived ? "archived" : "reverted"),
(rme->is_resolved(Bytecodes::_invokeinterface) ? " interface" : ""),
cp_index,
cp->pool_holder()->name()->as_C_string(),
klass_name->as_C_string(), name->as_C_string(), signature->as_C_string());
if (archived) {
Klass* resolved_klass = cp->resolved_klass_at(klass_cp_index);
log.print(" => %s%s",
resolved_klass->name()->as_C_string(),
(rme->is_resolved(Bytecodes::_invokestatic) ? " *** static" : ""));
}
}
ArchiveBuilder::alloc_stats()->record_method_cp_entry(archived, resolved && !archived);
}
}
}
void ConstantPoolCache::remove_resolved_indy_entries_if_non_deterministic() {
ConstantPool* cp = constant_pool();
ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(cp);
for (int i = 0; i < _resolved_indy_entries->length(); i++) {
ResolvedIndyEntry* rei = _resolved_indy_entries->adr_at(i);
int cp_index = rei->constant_pool_index();
bool archived = false;
bool resolved = rei->is_resolved();
if (resolved && AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
rei->mark_and_relocate();
archived = true;
} else {
rei->remove_unshareable_info();
}
if (resolved) {
LogStreamHandle(Trace, cds, resolve) log;
if (log.is_enabled()) {
ResourceMark rm;
int bsm = cp->bootstrap_method_ref_index_at(cp_index);
int bsm_ref = cp->method_handle_index_at(bsm);
Symbol* bsm_name = cp->uncached_name_ref_at(bsm_ref);
Symbol* bsm_signature = cp->uncached_signature_ref_at(bsm_ref);
Symbol* bsm_klass = cp->klass_name_at(cp->uncached_klass_ref_index_at(bsm_ref));
log.print("%s indy CP entry [%3d]: %s (%d)",
(archived ? "archived" : "reverted"),
cp_index, cp->pool_holder()->name()->as_C_string(), i);
log.print(" %s %s.%s:%s", (archived ? "=>" : " "), bsm_klass->as_C_string(),
bsm_name->as_C_string(), bsm_signature->as_C_string());
}
ArchiveBuilder::alloc_stats()->record_indy_cp_entry(archived, resolved && !archived);
}
}
}
bool ConstantPoolCache::can_archive_resolved_method(ConstantPool* src_cp, ResolvedMethodEntry* method_entry) {
InstanceKlass* pool_holder = constant_pool()->pool_holder();
if (!(pool_holder->is_shared_boot_class() || pool_holder->is_shared_platform_class() ||
pool_holder->is_shared_app_class())) {
// Archiving resolved cp entries for classes from non-builtin loaders
// is not yet supported.
return false;
}
if (CDSConfig::is_dumping_dynamic_archive()) {
// InstanceKlass::methods() has been resorted. We need to
// update the vtable_index in method_entry (not implemented)
return false;
}
if (!method_entry->is_resolved(Bytecodes::_invokevirtual)) {
if (method_entry->method() == nullptr) {
return false;
}
if (method_entry->method()->is_continuation_native_intrinsic()) {
return false; // FIXME: corresponding stub is generated on demand during method resolution (see LinkResolver::resolve_static_call).
}
}
int cp_index = method_entry->constant_pool_index();
assert(src_cp->tag_at(cp_index).is_method() || src_cp->tag_at(cp_index).is_interface_method(), "sanity");
if (!AOTConstantPoolResolver::is_resolution_deterministic(src_cp, cp_index)) {
return false;
}
if (method_entry->is_resolved(Bytecodes::_invokeinterface) ||
method_entry->is_resolved(Bytecodes::_invokevirtual) ||
method_entry->is_resolved(Bytecodes::_invokespecial)) {
return true;
} else if (method_entry->is_resolved(Bytecodes::_invokehandle)) {
if (CDSConfig::is_dumping_invokedynamic()) {
// invokehandle depends on archived MethodType and LambdaForms.
return true;
} else {
return false;
}
} else {
return false;
}
}
#endif // INCLUDE_CDS
void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
assert(!is_shared(), "shared caches are not deallocated");
data->remove_handle(_resolved_references);
set_resolved_references(OopHandle());
MetadataFactory::free_array<u2>(data, _reference_map);
set_reference_map(nullptr);
#if INCLUDE_CDS
if (_resolved_indy_entries != nullptr) {
MetadataFactory::free_array<ResolvedIndyEntry>(data, _resolved_indy_entries);
_resolved_indy_entries = nullptr;
}
if (_resolved_field_entries != nullptr) {
MetadataFactory::free_array<ResolvedFieldEntry>(data, _resolved_field_entries);
_resolved_field_entries = nullptr;
}
if (_resolved_method_entries != nullptr) {
MetadataFactory::free_array<ResolvedMethodEntry>(data, _resolved_method_entries);
_resolved_method_entries = nullptr;
}
#endif
}
#if INCLUDE_CDS_JAVA_HEAP
oop ConstantPoolCache::archived_references() {
if (_archived_references_index < 0) {
return nullptr;
}
return HeapShared::get_root(_archived_references_index);
}
void ConstantPoolCache::clear_archived_references() {
if (_archived_references_index >= 0) {
HeapShared::clear_root(_archived_references_index);
_archived_references_index = -1;
}
}
void ConstantPoolCache::set_archived_references(int root_index) {
assert(CDSConfig::is_dumping_heap(), "sanity");
_archived_references_index = root_index;
}
#endif
#if INCLUDE_JVMTI
static void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
ResourceMark rm;
if (!(*trace_name_printed)) {
log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
*trace_name_printed = true;
}
log_trace(redefine, class, update, constantpool)
("cpc %s entry update: %s", entry_type, new_method->external_name());
}
// RedefineClasses() API support:
// If any entry of this ConstantPoolCache points to any of
// old_methods, replace it with the corresponding new_method.
void ConstantPoolCache::adjust_method_entries(bool * trace_name_printed) {
if (_resolved_indy_entries != nullptr) {
for (int j = 0; j < _resolved_indy_entries->length(); j++) {
Method* old_method = resolved_indy_entry_at(j)->method();
if (old_method == nullptr || !old_method->is_old()) {
continue;
}
assert(!old_method->is_deleted(), "cannot delete these methods");
Method* new_method = old_method->get_new_method();
resolved_indy_entry_at(j)->adjust_method_entry(new_method);
log_adjust("indy", old_method, new_method, trace_name_printed);
}
}
if (_resolved_method_entries != nullptr) {
for (int i = 0; i < _resolved_method_entries->length(); i++) {
ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
// get interesting method entry
Method* old_method = method_entry->method();
if (old_method == nullptr || !old_method->is_old()) {
continue; // skip uninteresting entries
}
if (old_method->is_deleted()) {
// clean up entries with deleted methods
method_entry->reset_entry();
continue;
}
Method* new_method = old_method->get_new_method();
method_entry->adjust_method_entry(new_method);
log_adjust("non-indy", old_method, new_method, trace_name_printed);
}
}
}
// the constant pool cache should never contain old or obsolete methods
bool ConstantPoolCache::check_no_old_or_obsolete_entries() {
ResourceMark rm;
if (_resolved_indy_entries != nullptr) {
for (int i = 0; i < _resolved_indy_entries->length(); i++) {
Method* m = resolved_indy_entry_at(i)->method();
if (m != nullptr && !resolved_indy_entry_at(i)->check_no_old_or_obsolete_entry()) {
log_trace(redefine, class, update, constantpool)
("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
return false;
}
}
}
if (_resolved_method_entries != nullptr) {
for (int i = 0; i < _resolved_method_entries->length(); i++) {
ResolvedMethodEntry* method_entry = resolved_method_entry_at(i);
Method* m = method_entry->method();
if (m != nullptr && !method_entry->check_no_old_or_obsolete_entry()) {
log_trace(redefine, class, update, constantpool)
("cpcache check found old method entry: class: %s, old: %d, obsolete: %d, method: %s",
constant_pool()->pool_holder()->external_name(), m->is_old(), m->is_obsolete(), m->external_name());
return false;
}
}
}
return true;
}
void ConstantPoolCache::dump_cache() {
print_on(tty);
}
#endif // INCLUDE_JVMTI
void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) {
log_trace(cds)("Iter(ConstantPoolCache): %p", this);
it->push(&_constant_pool);
it->push(&_reference_map);
if (_resolved_indy_entries != nullptr) {
it->push(&_resolved_indy_entries, MetaspaceClosure::_writable);
}
if (_resolved_field_entries != nullptr) {
it->push(&_resolved_field_entries, MetaspaceClosure::_writable);
}
if (_resolved_method_entries != nullptr) {
it->push(&_resolved_method_entries, MetaspaceClosure::_writable);
}
}
bool ConstantPoolCache::save_and_throw_indy_exc(
const constantPoolHandle& cpool, int cpool_index, int index, constantTag tag, TRAPS) {
assert(HAS_PENDING_EXCEPTION, "No exception got thrown!");
assert(PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass()),
"No LinkageError exception");
// Use the resolved_references() lock for this cpCache entry.
// resolved_references are created for all classes with Invokedynamic, MethodHandle
// or MethodType constant pool cache entries.
JavaThread* current = THREAD;
objArrayHandle resolved_references(current, cpool->resolved_references());
assert(resolved_references() != nullptr,
"a resolved_references array should have been created for this class");
ObjectLocker ol(resolved_references, current);
// if the indy_info is resolved or the indy_resolution_failed flag is set then another
// thread either succeeded in resolving the method or got a LinkageError
// exception, before this thread was able to record its failure. So, clear
// this thread's exception and return false so caller can use the earlier
// thread's result.
if (resolved_indy_entry_at(index)->is_resolved() || resolved_indy_entry_at(index)->resolution_failed()) {
CLEAR_PENDING_EXCEPTION;
return false;
}
ResourceMark rm(THREAD);
Symbol* error = PENDING_EXCEPTION->klass()->name();
const char* message = java_lang_Throwable::message_as_utf8(PENDING_EXCEPTION);
int encoded_index = ResolutionErrorTable::encode_indy_index(index);
SystemDictionary::add_resolution_error(cpool, encoded_index, error, message);
resolved_indy_entry_at(index)->set_resolution_failed();
return true;
}
oop ConstantPoolCache::set_dynamic_call(const CallInfo &call_info, int index) {
ResourceMark rm;
// Use the resolved_references() lock for this cpCache entry.
// resolved_references are created for all classes with Invokedynamic, MethodHandle
// or MethodType constant pool cache entries.
JavaThread* current = JavaThread::current();
constantPoolHandle cp(current, constant_pool());
objArrayHandle resolved_references(current, cp->resolved_references());
assert(resolved_references() != nullptr,
"a resolved_references array should have been created for this class");
ObjectLocker ol(resolved_references, current);
assert(index >= 0, "Indy index must be positive at this point");
if (resolved_indy_entry_at(index)->method() != nullptr) {
return cp->resolved_reference_from_indy(index);
}
if (resolved_indy_entry_at(index)->resolution_failed()) {
// Before we got here, another thread got a LinkageError exception during
// resolution. Ignore our success and throw their exception.
guarantee(index >= 0, "Invalid indy index");
int encoded_index = ResolutionErrorTable::encode_indy_index(index);
ConstantPool::throw_resolution_error(cp, encoded_index, current);
return nullptr;
}
Method* adapter = call_info.resolved_method();
const Handle appendix = call_info.resolved_appendix();
const bool has_appendix = appendix.not_null();
LogStream* log_stream = nullptr;
LogStreamHandle(Debug, methodhandles, indy) lsh_indy;
if (lsh_indy.is_enabled()) {
ResourceMark rm;
log_stream = &lsh_indy;
log_stream->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
0xba,
p2i(appendix()),
(has_appendix ? "" : " (unused)"),
p2i(adapter));
adapter->print_on(log_stream);
if (has_appendix) appendix()->print_on(log_stream);
}
if (has_appendix) {
const int appendix_index = resolved_indy_entry_at(index)->resolved_references_index();
assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
assert(resolved_references->obj_at(appendix_index) == nullptr, "init just once");
resolved_references->obj_at_put(appendix_index, appendix());
}
// Populate entry with resolved information
assert(resolved_indy_entries() != nullptr, "Invokedynamic array is empty, cannot fill with resolved information");
resolved_indy_entry_at(index)->fill_in(adapter, adapter->size_of_parameters(), as_TosState(adapter->result_type()), has_appendix);
if (log_stream != nullptr) {
resolved_indy_entry_at(index)->print_on(log_stream);
}
return appendix();
}
oop ConstantPoolCache::appendix_if_resolved(int method_index) const {
ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
return appendix_if_resolved(method_entry);
}
oop ConstantPoolCache::appendix_if_resolved(ResolvedMethodEntry* method_entry) const {
if (!method_entry->has_appendix())
return nullptr;
const int ref_index = method_entry->resolved_references_index();
return constant_pool()->resolved_reference_at(ref_index);
}
// Printing
void ConstantPoolCache::print_on(outputStream* st) const {
st->print_cr("%s", internal_name());
// print constant pool cache entries
print_resolved_field_entries(st);
print_resolved_method_entries(st);
print_resolved_indy_entries(st);
}
void ConstantPoolCache::print_resolved_field_entries(outputStream* st) const {
for (int field_index = 0; field_index < resolved_field_entries_length(); field_index++) {
resolved_field_entry_at(field_index)->print_on(st);
}
}
void ConstantPoolCache::print_resolved_method_entries(outputStream* st) const {
for (int method_index = 0; method_index < resolved_method_entries_length(); method_index++) {
ResolvedMethodEntry* method_entry = resolved_method_entry_at(method_index);
method_entry->print_on(st);
if (method_entry->has_appendix()) {
st->print(" appendix: ");
constant_pool()->resolved_reference_from_method(method_index)->print_on(st);
}
}
}
void ConstantPoolCache::print_resolved_indy_entries(outputStream* st) const {
for (int indy_index = 0; indy_index < resolved_indy_entries_length(); indy_index++) {
ResolvedIndyEntry* indy_entry = resolved_indy_entry_at(indy_index);
indy_entry->print_on(st);
if (indy_entry->has_appendix()) {
st->print(" appendix: ");
constant_pool()->resolved_reference_from_indy(indy_index)->print_on(st);
}
}
}
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