e72bfe15ad
Reviewed-by: kvn, redestad, dholmes, mdoerr, coleenp
853 lines
34 KiB
C++
853 lines
34 KiB
C++
/*
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* Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/resolutionErrors.hpp"
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#include "interpreter/bytecodeStream.hpp"
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#include "interpreter/bytecodes.hpp"
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#include "interpreter/interpreter.hpp"
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#include "interpreter/linkResolver.hpp"
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#include "interpreter/rewriter.hpp"
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#include "logging/log.hpp"
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#include "memory/heapShared.hpp"
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#include "memory/metadataFactory.hpp"
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#include "memory/metaspaceClosure.hpp"
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#include "memory/metaspaceShared.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/access.inline.hpp"
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#include "oops/compressedOops.hpp"
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#include "oops/constantPool.inline.hpp"
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#include "oops/cpCache.inline.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "prims/methodHandles.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/orderAccess.hpp"
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#include "utilities/macros.hpp"
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// Implementation of ConstantPoolCacheEntry
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void ConstantPoolCacheEntry::initialize_entry(int index) {
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assert(0 < index && index < 0x10000, "sanity check");
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_indices = index;
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_f1 = NULL;
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_f2 = _flags = 0;
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assert(constant_pool_index() == index, "");
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}
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void ConstantPoolCacheEntry::verify_just_initialized(bool f2_used) {
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assert((_indices & (~cp_index_mask)) == 0, "sanity");
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assert(_f1 == NULL, "sanity");
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assert(_flags == 0, "sanity");
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if (!f2_used) {
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assert(_f2 == 0, "sanity");
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}
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}
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void ConstantPoolCacheEntry::reinitialize(bool f2_used) {
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_indices &= cp_index_mask;
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_f1 = NULL;
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_flags = 0;
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if (!f2_used) {
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_f2 = 0;
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}
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}
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int ConstantPoolCacheEntry::make_flags(TosState state,
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int option_bits,
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int field_index_or_method_params) {
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assert(state < number_of_states, "Invalid state in make_flags");
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int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params;
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// Preserve existing flag bit values
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// The low bits are a field offset, or else the method parameter size.
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#ifdef ASSERT
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TosState old_state = flag_state();
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assert(old_state == (TosState)0 || old_state == state,
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"inconsistent cpCache flags state");
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#endif
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return (_flags | f) ;
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}
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void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) {
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#ifdef ASSERT
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// Read once.
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volatile Bytecodes::Code c = bytecode_1();
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assert(c == 0 || c == code || code == 0, "update must be consistent");
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#endif
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// Need to flush pending stores here before bytecode is written.
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OrderAccess::release_store(&_indices, _indices | ((u_char)code << bytecode_1_shift));
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}
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void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) {
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#ifdef ASSERT
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// Read once.
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volatile Bytecodes::Code c = bytecode_2();
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assert(c == 0 || c == code || code == 0, "update must be consistent");
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#endif
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// Need to flush pending stores here before bytecode is written.
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OrderAccess::release_store(&_indices, _indices | ((u_char)code << bytecode_2_shift));
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}
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// Sets f1, ordering with previous writes.
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void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) {
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assert(f1 != NULL, "");
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OrderAccess::release_store(&_f1, f1);
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}
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void ConstantPoolCacheEntry::set_indy_resolution_failed() {
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OrderAccess::release_store(&_flags, _flags | (1 << indy_resolution_failed_shift));
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}
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// Note that concurrent update of both bytecodes can leave one of them
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// reset to zero. This is harmless; the interpreter will simply re-resolve
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// the damaged entry. More seriously, the memory synchronization is needed
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// to flush other fields (f1, f2) completely to memory before the bytecodes
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// are updated, lest other processors see a non-zero bytecode but zero f1/f2.
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void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code,
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Bytecodes::Code put_code,
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Klass* field_holder,
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int field_index,
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int field_offset,
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TosState field_type,
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bool is_final,
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bool is_volatile,
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Klass* root_klass) {
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set_f1(field_holder);
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set_f2(field_offset);
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assert((field_index & field_index_mask) == field_index,
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"field index does not fit in low flag bits");
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set_field_flags(field_type,
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((is_volatile ? 1 : 0) << is_volatile_shift) |
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((is_final ? 1 : 0) << is_final_shift),
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field_index);
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set_bytecode_1(get_code);
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set_bytecode_2(put_code);
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NOT_PRODUCT(verify(tty));
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}
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void ConstantPoolCacheEntry::set_parameter_size(int value) {
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// This routine is called only in corner cases where the CPCE is not yet initialized.
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// See AbstractInterpreter::deopt_continue_after_entry.
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assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value,
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"size must not change: parameter_size=%d, value=%d", parameter_size(), value);
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// Setting the parameter size by itself is only safe if the
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// current value of _flags is 0, otherwise another thread may have
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// updated it and we don't want to overwrite that value. Don't
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// bother trying to update it once it's nonzero but always make
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// sure that the final parameter size agrees with what was passed.
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if (_flags == 0) {
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intx newflags = (value & parameter_size_mask);
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Atomic::cmpxchg(newflags, &_flags, (intx)0);
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}
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guarantee(parameter_size() == value,
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"size must not change: parameter_size=%d, value=%d", parameter_size(), value);
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}
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void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
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const methodHandle& method,
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int vtable_index,
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bool sender_is_interface) {
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bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
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assert(method->interpreter_entry() != NULL, "should have been set at this point");
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assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
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int byte_no = -1;
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bool change_to_virtual = false;
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InstanceKlass* holder = NULL; // have to declare this outside the switch
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switch (invoke_code) {
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case Bytecodes::_invokeinterface:
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holder = method->method_holder();
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// check for private interface method invocations
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if (vtable_index == Method::nonvirtual_vtable_index && holder->is_interface() ) {
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assert(method->is_private(), "unexpected non-private method");
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assert(method->can_be_statically_bound(), "unexpected non-statically-bound method");
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// set_f2_as_vfinal_method checks if is_vfinal flag is true.
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set_method_flags(as_TosState(method->result_type()),
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( 1 << is_vfinal_shift) |
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((method->is_final_method() ? 1 : 0) << is_final_shift),
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method()->size_of_parameters());
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set_f2_as_vfinal_method(method());
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byte_no = 2;
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set_f1(holder); // interface klass*
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break;
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}
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else {
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// We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
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// instruction links to a non-interface method (in Object). This can happen when
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// an interface redeclares an Object method (like CharSequence declaring toString())
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// or when invokeinterface is used explicitly.
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// In that case, the method has no itable index and must be invoked as a virtual.
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// Set a flag to keep track of this corner case.
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assert(holder->is_interface() || holder == SystemDictionary::Object_klass(), "unexpected holder class");
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assert(method->is_public(), "Calling non-public method in Object with invokeinterface");
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change_to_virtual = true;
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// ...and fall through as if we were handling invokevirtual:
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}
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case Bytecodes::_invokevirtual:
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{
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if (!is_vtable_call) {
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assert(method->can_be_statically_bound(), "");
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// set_f2_as_vfinal_method checks if is_vfinal flag is true.
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set_method_flags(as_TosState(method->result_type()),
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( 1 << is_vfinal_shift) |
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((method->is_final_method() ? 1 : 0) << is_final_shift) |
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((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
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method()->size_of_parameters());
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set_f2_as_vfinal_method(method());
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} else {
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assert(!method->can_be_statically_bound(), "");
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assert(vtable_index >= 0, "valid index");
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assert(!method->is_final_method(), "sanity");
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set_method_flags(as_TosState(method->result_type()),
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((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
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method()->size_of_parameters());
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set_f2(vtable_index);
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}
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byte_no = 2;
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break;
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}
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case Bytecodes::_invokespecial:
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case Bytecodes::_invokestatic:
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assert(!is_vtable_call, "");
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// Note: Read and preserve the value of the is_vfinal flag on any
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// invokevirtual bytecode shared with this constant pool cache entry.
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// It is cheap and safe to consult is_vfinal() at all times.
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// Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
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set_method_flags(as_TosState(method->result_type()),
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((is_vfinal() ? 1 : 0) << is_vfinal_shift) |
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((method->is_final_method() ? 1 : 0) << is_final_shift),
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method()->size_of_parameters());
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set_f1(method());
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byte_no = 1;
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break;
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default:
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ShouldNotReachHere();
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break;
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}
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// Note: byte_no also appears in TemplateTable::resolve.
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if (byte_no == 1) {
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assert(invoke_code != Bytecodes::_invokevirtual &&
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invoke_code != Bytecodes::_invokeinterface, "");
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bool do_resolve = true;
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// Don't mark invokespecial to method as resolved if sender is an interface. The receiver
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// has to be checked that it is a subclass of the current class every time this bytecode
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// is executed.
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if (invoke_code == Bytecodes::_invokespecial && sender_is_interface &&
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method->name() != vmSymbols::object_initializer_name()) {
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do_resolve = false;
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}
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if (invoke_code == Bytecodes::_invokestatic) {
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assert(method->method_holder()->is_initialized() ||
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method->method_holder()->is_reentrant_initialization(Thread::current()),
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"invalid class initialization state for invoke_static");
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if (!VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
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// Don't mark invokestatic to method as resolved if the holder class has not yet completed
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// initialization. An invokestatic must only proceed if the class is initialized, but if
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// we resolve it before then that class initialization check is skipped.
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//
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// When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
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// template interpreter supports fast class initialization check for
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// invokestatic which doesn't require call site re-resolution to
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// enforce class initialization barrier.
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do_resolve = false;
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}
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}
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if (do_resolve) {
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set_bytecode_1(invoke_code);
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}
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} else if (byte_no == 2) {
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if (change_to_virtual) {
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assert(invoke_code == Bytecodes::_invokeinterface, "");
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// NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
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//
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// Workaround for the case where we encounter an invokeinterface, but we
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// should really have an _invokevirtual since the resolved method is a
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// virtual method in java.lang.Object. This is a corner case in the spec
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// but is presumably legal. javac does not generate this code.
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//
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// We do not set bytecode_1() to _invokeinterface, because that is the
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// bytecode # used by the interpreter to see if it is resolved. In this
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// case, the method gets reresolved with caller for each interface call
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// because the actual selected method may not be public.
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//
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// We set bytecode_2() to _invokevirtual.
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// See also interpreterRuntime.cpp. (8/25/2000)
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} else {
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assert(invoke_code == Bytecodes::_invokevirtual ||
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(invoke_code == Bytecodes::_invokeinterface &&
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((method->is_private() ||
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(method->is_final() && method->method_holder() == SystemDictionary::Object_klass())))),
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"unexpected invocation mode");
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if (invoke_code == Bytecodes::_invokeinterface &&
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(method->is_private() || method->is_final())) {
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// We set bytecode_1() to _invokeinterface, because that is the
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// bytecode # used by the interpreter to see if it is resolved.
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// We set bytecode_2() to _invokevirtual.
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set_bytecode_1(invoke_code);
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}
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}
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// set up for invokevirtual, even if linking for invokeinterface also:
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set_bytecode_2(Bytecodes::_invokevirtual);
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} else {
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ShouldNotReachHere();
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}
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NOT_PRODUCT(verify(tty));
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}
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void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, const methodHandle& method,
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bool sender_is_interface) {
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int index = Method::nonvirtual_vtable_index;
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// index < 0; FIXME: inline and customize set_direct_or_vtable_call
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set_direct_or_vtable_call(invoke_code, method, index, sender_is_interface);
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}
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void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, const methodHandle& method, int index) {
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// either the method is a miranda or its holder should accept the given index
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assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
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// index >= 0; FIXME: inline and customize set_direct_or_vtable_call
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set_direct_or_vtable_call(invoke_code, method, index, false);
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}
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void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code,
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Klass* referenced_klass,
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const methodHandle& method, int index) {
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assert(method->method_holder()->verify_itable_index(index), "");
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assert(invoke_code == Bytecodes::_invokeinterface, "");
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InstanceKlass* interf = method->method_holder();
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assert(interf->is_interface(), "must be an interface");
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assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
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set_f1(referenced_klass);
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set_f2((intx)method());
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set_method_flags(as_TosState(method->result_type()),
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0, // no option bits
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method()->size_of_parameters());
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set_bytecode_1(Bytecodes::_invokeinterface);
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}
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void ConstantPoolCacheEntry::set_method_handle(const constantPoolHandle& cpool, const CallInfo &call_info) {
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set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info);
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}
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void ConstantPoolCacheEntry::set_dynamic_call(const constantPoolHandle& cpool, const CallInfo &call_info) {
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set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info);
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}
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void ConstantPoolCacheEntry::set_method_handle_common(const constantPoolHandle& cpool,
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Bytecodes::Code invoke_code,
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const CallInfo &call_info) {
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// NOTE: This CPCE can be the subject of data races.
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// There are three words to update: flags, refs[f2], f1 (in that order).
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// Writers must store all other values before f1.
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// Readers must test f1 first for non-null before reading other fields.
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// Competing writers must acquire exclusive access via a lock.
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// A losing writer waits on the lock until the winner writes f1 and leaves
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// the lock, so that when the losing writer returns, he can use the linked
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// cache entry.
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objArrayHandle resolved_references(Thread::current(), cpool->resolved_references());
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// Use the resolved_references() lock for this cpCache entry.
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// resolved_references are created for all classes with Invokedynamic, MethodHandle
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// or MethodType constant pool cache entries.
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assert(resolved_references() != NULL,
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"a resolved_references array should have been created for this class");
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ObjectLocker ol(resolved_references, Thread::current());
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if (!is_f1_null()) {
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return;
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}
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if (indy_resolution_failed()) {
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// Before we got here, another thread got a LinkageError exception during
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// resolution. Ignore our success and throw their exception.
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ConstantPoolCache* cpCache = cpool->cache();
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int index = -1;
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for (int i = 0; i < cpCache->length(); i++) {
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if (cpCache->entry_at(i) == this) {
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index = i;
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break;
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}
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}
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guarantee(index >= 0, "Didn't find cpCache entry!");
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int encoded_index = ResolutionErrorTable::encode_cpcache_index(
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ConstantPool::encode_invokedynamic_index(index));
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Thread* THREAD = Thread::current();
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ConstantPool::throw_resolution_error(cpool, encoded_index, THREAD);
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return;
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}
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const methodHandle adapter = call_info.resolved_method();
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const Handle appendix = call_info.resolved_appendix();
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const bool has_appendix = appendix.not_null();
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// Write the flags.
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// MHs and indy are always sig-poly and have a local signature.
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set_method_flags(as_TosState(adapter->result_type()),
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((has_appendix ? 1 : 0) << has_appendix_shift ) |
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( 1 << has_local_signature_shift ) |
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( 1 << is_final_shift ),
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adapter->size_of_parameters());
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if (TraceInvokeDynamic) {
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ttyLocker ttyl;
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tty->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method=" PTR_FORMAT " (local signature) ",
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invoke_code,
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p2i(appendix()),
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(has_appendix ? "" : " (unused)"),
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p2i(adapter()));
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adapter->print();
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if (has_appendix) appendix()->print();
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}
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// Method handle invokes and invokedynamic sites use both cp cache words.
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// refs[f2], if not null, contains a value passed as a trailing argument to the adapter.
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// In the general case, this could be the call site's MethodType,
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// for use with java.lang.Invokers.checkExactType, or else a CallSite object.
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// f1 contains the adapter method which manages the actual call.
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// In the general case, this is a compiled LambdaForm.
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// (The Java code is free to optimize these calls by binding other
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// sorts of methods and appendices to call sites.)
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|
// JVM-level linking is via f1, 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 f1 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[f2].
|
|
// This allows us to create fewer Methods, while keeping type safety.
|
|
//
|
|
|
|
// Store appendix, if any.
|
|
if (has_appendix) {
|
|
const int appendix_index = f2_as_index();
|
|
assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob");
|
|
assert(resolved_references->obj_at(appendix_index) == NULL, "init just once");
|
|
resolved_references->obj_at_put(appendix_index, appendix());
|
|
}
|
|
|
|
release_set_f1(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.
|
|
set_bytecode_1(invoke_code);
|
|
NOT_PRODUCT(verify(tty));
|
|
if (TraceInvokeDynamic) {
|
|
ttyLocker ttyl;
|
|
this->print(tty, 0);
|
|
}
|
|
|
|
assert(has_appendix == this->has_appendix(), "proper storage of appendix flag");
|
|
assert(this->has_local_signature(), "proper storage of signature flag");
|
|
}
|
|
|
|
bool ConstantPoolCacheEntry::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(SystemDictionary::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.
|
|
objArrayHandle resolved_references(Thread::current(), cpool->resolved_references());
|
|
assert(resolved_references() != NULL,
|
|
"a resolved_references array should have been created for this class");
|
|
ObjectLocker ol(resolved_references, THREAD);
|
|
|
|
// if f1 is not null 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 (!is_f1_null() || indy_resolution_failed()) {
|
|
CLEAR_PENDING_EXCEPTION;
|
|
return false;
|
|
}
|
|
|
|
Symbol* error = PENDING_EXCEPTION->klass()->name();
|
|
Symbol* message = java_lang_Throwable::detail_message(PENDING_EXCEPTION);
|
|
|
|
SystemDictionary::add_resolution_error(cpool, index, error, message);
|
|
set_indy_resolution_failed();
|
|
return true;
|
|
}
|
|
|
|
Method* ConstantPoolCacheEntry::method_if_resolved(const constantPoolHandle& cpool) {
|
|
// Decode the action of set_method and set_interface_call
|
|
Bytecodes::Code invoke_code = bytecode_1();
|
|
if (invoke_code != (Bytecodes::Code)0) {
|
|
Metadata* f1 = f1_ord();
|
|
if (f1 != NULL) {
|
|
switch (invoke_code) {
|
|
case Bytecodes::_invokeinterface:
|
|
assert(f1->is_klass(), "");
|
|
return f2_as_interface_method();
|
|
case Bytecodes::_invokestatic:
|
|
case Bytecodes::_invokespecial:
|
|
assert(!has_appendix(), "");
|
|
case Bytecodes::_invokehandle:
|
|
case Bytecodes::_invokedynamic:
|
|
assert(f1->is_method(), "");
|
|
return (Method*)f1;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
invoke_code = bytecode_2();
|
|
if (invoke_code != (Bytecodes::Code)0) {
|
|
switch (invoke_code) {
|
|
case Bytecodes::_invokevirtual:
|
|
if (is_vfinal()) {
|
|
// invokevirtual
|
|
Method* m = f2_as_vfinal_method();
|
|
assert(m->is_method(), "");
|
|
return m;
|
|
} else {
|
|
int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index());
|
|
if (cpool->tag_at(holder_index).is_klass()) {
|
|
Klass* klass = cpool->resolved_klass_at(holder_index);
|
|
return klass->method_at_vtable(f2_as_index());
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
oop ConstantPoolCacheEntry::appendix_if_resolved(const constantPoolHandle& cpool) {
|
|
if (!has_appendix())
|
|
return NULL;
|
|
const int ref_index = f2_as_index();
|
|
objArrayOop resolved_references = cpool->resolved_references();
|
|
return resolved_references->obj_at(ref_index);
|
|
}
|
|
|
|
|
|
#if INCLUDE_JVMTI
|
|
|
|
void log_adjust(const char* entry_type, Method* old_method, Method* new_method, bool* trace_name_printed) {
|
|
if (log_is_enabled(Info, redefine, class, update)) {
|
|
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_debug(redefine, class, update, constantpool)
|
|
("cpc %s entry update: %s(%s)", entry_type, new_method->name()->as_C_string(), new_method->signature()->as_C_string());
|
|
}
|
|
}
|
|
|
|
// RedefineClasses() API support:
|
|
// If this ConstantPoolCacheEntry refers to old_method then update it
|
|
// to refer to new_method.
|
|
void ConstantPoolCacheEntry::adjust_method_entry(Method* old_method,
|
|
Method* new_method, bool * trace_name_printed) {
|
|
|
|
if (is_vfinal()) {
|
|
// virtual and final so _f2 contains method ptr instead of vtable index
|
|
if (f2_as_vfinal_method() == old_method) {
|
|
// match old_method so need an update
|
|
// NOTE: can't use set_f2_as_vfinal_method as it asserts on different values
|
|
_f2 = (intptr_t)new_method;
|
|
log_adjust("vfinal", old_method, new_method, trace_name_printed);
|
|
}
|
|
return;
|
|
}
|
|
|
|
assert (_f1 != NULL, "should not call with uninteresting entry");
|
|
|
|
if (!(_f1->is_method())) {
|
|
// _f1 is a Klass* for an interface, _f2 is the method
|
|
if (f2_as_interface_method() == old_method) {
|
|
_f2 = (intptr_t)new_method;
|
|
log_adjust("interface", old_method, new_method, trace_name_printed);
|
|
}
|
|
} else if (_f1 == old_method) {
|
|
_f1 = new_method;
|
|
log_adjust("special, static or dynamic", old_method, new_method, trace_name_printed);
|
|
}
|
|
}
|
|
|
|
// a constant pool cache entry should never contain old or obsolete methods
|
|
bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() {
|
|
Method* m = get_interesting_method_entry();
|
|
// return false if m refers to a non-deleted old or obsolete method
|
|
if (m != NULL) {
|
|
assert(m->is_valid() && m->is_method(), "m is a valid method");
|
|
return !m->is_old() && !m->is_obsolete(); // old is always set for old and obsolete
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
Method* ConstantPoolCacheEntry::get_interesting_method_entry() {
|
|
if (!is_method_entry()) {
|
|
// not a method entry so not interesting by default
|
|
return NULL;
|
|
}
|
|
Method* m = NULL;
|
|
if (is_vfinal()) {
|
|
// virtual and final so _f2 contains method ptr instead of vtable index
|
|
m = f2_as_vfinal_method();
|
|
} else if (is_f1_null()) {
|
|
// NULL _f1 means this is a virtual entry so also not interesting
|
|
return NULL;
|
|
} else {
|
|
if (!(_f1->is_method())) {
|
|
// _f1 is a Klass* for an interface
|
|
m = f2_as_interface_method();
|
|
} else {
|
|
m = f1_as_method();
|
|
}
|
|
}
|
|
assert(m != NULL && m->is_method(), "sanity check");
|
|
if (m == NULL || !m->is_method()) {
|
|
return NULL;
|
|
}
|
|
return m;
|
|
}
|
|
#endif // INCLUDE_JVMTI
|
|
|
|
void ConstantPoolCacheEntry::print(outputStream* st, int index) const {
|
|
// print separator
|
|
if (index == 0) st->print_cr(" -------------");
|
|
// print entry
|
|
st->print("%3d (" PTR_FORMAT ") ", index, (intptr_t)this);
|
|
st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(),
|
|
constant_pool_index());
|
|
st->print_cr(" [ " PTR_FORMAT "]", (intptr_t)_f1);
|
|
st->print_cr(" [ " PTR_FORMAT "]", (intptr_t)_f2);
|
|
st->print_cr(" [ " PTR_FORMAT "]", (intptr_t)_flags);
|
|
st->print_cr(" -------------");
|
|
}
|
|
|
|
void ConstantPoolCacheEntry::verify(outputStream* st) const {
|
|
// not implemented yet
|
|
}
|
|
|
|
// Implementation of ConstantPoolCache
|
|
|
|
ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data,
|
|
const intStack& index_map,
|
|
const intStack& invokedynamic_index_map,
|
|
const intStack& invokedynamic_map, TRAPS) {
|
|
|
|
const int length = index_map.length() + invokedynamic_index_map.length();
|
|
int size = ConstantPoolCache::size(length);
|
|
|
|
return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD)
|
|
ConstantPoolCache(length, index_map, invokedynamic_index_map, invokedynamic_map);
|
|
}
|
|
|
|
void ConstantPoolCache::initialize(const intArray& inverse_index_map,
|
|
const intArray& invokedynamic_inverse_index_map,
|
|
const intArray& invokedynamic_references_map) {
|
|
for (int i = 0; i < inverse_index_map.length(); i++) {
|
|
ConstantPoolCacheEntry* e = entry_at(i);
|
|
int original_index = inverse_index_map.at(i);
|
|
e->initialize_entry(original_index);
|
|
assert(entry_at(i) == e, "sanity");
|
|
}
|
|
|
|
// Append invokedynamic entries at the end
|
|
int invokedynamic_offset = inverse_index_map.length();
|
|
for (int i = 0; i < invokedynamic_inverse_index_map.length(); i++) {
|
|
int offset = i + invokedynamic_offset;
|
|
ConstantPoolCacheEntry* e = entry_at(offset);
|
|
int original_index = invokedynamic_inverse_index_map.at(i);
|
|
e->initialize_entry(original_index);
|
|
assert(entry_at(offset) == e, "sanity");
|
|
}
|
|
|
|
for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) {
|
|
const int cpci = invokedynamic_references_map.at(ref);
|
|
if (cpci >= 0) {
|
|
entry_at(cpci)->initialize_resolved_reference_index(ref);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ConstantPoolCache::verify_just_initialized() {
|
|
DEBUG_ONLY(walk_entries_for_initialization(/*check_only = */ true));
|
|
}
|
|
|
|
void ConstantPoolCache::remove_unshareable_info() {
|
|
walk_entries_for_initialization(/*check_only = */ false);
|
|
}
|
|
|
|
void ConstantPoolCache::walk_entries_for_initialization(bool check_only) {
|
|
assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "sanity");
|
|
// When dumping the archive, we want to clean up the ConstantPoolCache
|
|
// to remove any effect of linking due to the execution of Java code --
|
|
// each ConstantPoolCacheEntry will have the same contents as if
|
|
// ConstantPoolCache::initialize has just returned:
|
|
//
|
|
// - We keep the ConstantPoolCache::constant_pool_index() bits for all entries.
|
|
// - We keep the "f2" field for entries used by invokedynamic and invokehandle
|
|
// - All other bits in the entries are cleared to zero.
|
|
ResourceMark rm;
|
|
|
|
InstanceKlass* ik = constant_pool()->pool_holder();
|
|
bool* f2_used = NEW_RESOURCE_ARRAY(bool, length());
|
|
memset(f2_used, 0, sizeof(bool) * length());
|
|
|
|
// Find all the slots that we need to preserve f2
|
|
for (int i = 0; i < ik->methods()->length(); i++) {
|
|
Method* m = ik->methods()->at(i);
|
|
RawBytecodeStream bcs(m);
|
|
while (!bcs.is_last_bytecode()) {
|
|
Bytecodes::Code opcode = bcs.raw_next();
|
|
switch (opcode) {
|
|
case Bytecodes::_invokedynamic: {
|
|
int index = Bytes::get_native_u4(bcs.bcp() + 1);
|
|
int cp_cache_index = constant_pool()->invokedynamic_cp_cache_index(index);
|
|
f2_used[cp_cache_index] = 1;
|
|
}
|
|
break;
|
|
case Bytecodes::_invokehandle: {
|
|
int cp_cache_index = Bytes::get_native_u2(bcs.bcp() + 1);
|
|
f2_used[cp_cache_index] = 1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (check_only) {
|
|
DEBUG_ONLY(
|
|
for (int i=0; i<length(); i++) {
|
|
entry_at(i)->verify_just_initialized(f2_used[i]);
|
|
})
|
|
} else {
|
|
for (int i=0; i<length(); i++) {
|
|
entry_at(i)->reinitialize(f2_used[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ConstantPoolCache::deallocate_contents(ClassLoaderData* data) {
|
|
assert(!is_shared(), "shared caches are not deallocated");
|
|
data->remove_handle(_resolved_references);
|
|
set_resolved_references(NULL);
|
|
MetadataFactory::free_array<u2>(data, _reference_map);
|
|
set_reference_map(NULL);
|
|
}
|
|
|
|
#if INCLUDE_CDS_JAVA_HEAP
|
|
oop ConstantPoolCache::archived_references() {
|
|
if (CompressedOops::is_null(_archived_references)) {
|
|
return NULL;
|
|
}
|
|
return HeapShared::materialize_archived_object(_archived_references);
|
|
}
|
|
|
|
void ConstantPoolCache::set_archived_references(oop o) {
|
|
assert(DumpSharedSpaces, "called only during runtime");
|
|
_archived_references = CompressedOops::encode(o);
|
|
}
|
|
#endif
|
|
|
|
#if INCLUDE_JVMTI
|
|
// 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) {
|
|
for (int i = 0; i < length(); i++) {
|
|
ConstantPoolCacheEntry* entry = entry_at(i);
|
|
Method* old_method = entry->get_interesting_method_entry();
|
|
if (old_method == NULL || !old_method->is_old()) {
|
|
continue; // skip uninteresting entries
|
|
}
|
|
if (old_method->is_deleted()) {
|
|
// clean up entries with deleted methods
|
|
entry->initialize_entry(entry->constant_pool_index());
|
|
continue;
|
|
}
|
|
Method* new_method = old_method->get_new_method();
|
|
entry_at(i)->adjust_method_entry(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() {
|
|
for (int i = 1; i < length(); i++) {
|
|
if (entry_at(i)->get_interesting_method_entry() != NULL &&
|
|
!entry_at(i)->check_no_old_or_obsolete_entries()) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void ConstantPoolCache::dump_cache() {
|
|
for (int i = 1; i < length(); i++) {
|
|
if (entry_at(i)->get_interesting_method_entry() != NULL) {
|
|
entry_at(i)->print(tty, i);
|
|
}
|
|
}
|
|
}
|
|
#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);
|
|
}
|
|
|
|
// Printing
|
|
|
|
void ConstantPoolCache::print_on(outputStream* st) const {
|
|
st->print_cr("%s", internal_name());
|
|
// print constant pool cache entries
|
|
for (int i = 0; i < length(); i++) entry_at(i)->print(st, i);
|
|
}
|
|
|
|
void ConstantPoolCache::print_value_on(outputStream* st) const {
|
|
st->print("cache [%d]", length());
|
|
print_address_on(st);
|
|
st->print(" for ");
|
|
constant_pool()->print_value_on(st);
|
|
}
|
|
|
|
|
|
// Verification
|
|
|
|
void ConstantPoolCache::verify_on(outputStream* st) {
|
|
// print constant pool cache entries
|
|
for (int i = 0; i < length(); i++) entry_at(i)->verify(st);
|
|
}
|