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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2016 SAP SE. 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 "asm/macroAssembler.inline.hpp"
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#include "code/vtableStubs.hpp"
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#include "interp_masm_s390.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/klassVtable.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "vmreg_s390.inline.hpp"
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#ifdef COMPILER2
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#include "opto/runtime.hpp"
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#endif
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// Machine-dependent part of VtableStubs: create vtableStub of correct
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// size and initialize its code.
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#define __ masm->
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#ifndef PRODUCT
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extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
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#endif
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// Used by compiler only; may use only caller saved, non-argument registers.
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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const int code_length = VtableStub::pd_code_size_limit(true);
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VtableStub *s = new(code_length) VtableStub(true, vtable_index);
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if (s == NULL) { // Indicates OOM In the code cache.
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return NULL;
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}
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ResourceMark rm;
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CodeBuffer cb(s->entry_point(), code_length);
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MacroAssembler *masm = new MacroAssembler(&cb);
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address start_pc;
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int padding_bytes = 0;
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#if (!defined(PRODUCT) && defined(COMPILER2))
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if (CountCompiledCalls) {
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// Count unused bytes
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// worst case actual size
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padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true);
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// Use generic emitter for direct memory increment.
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// Abuse Z_method as scratch register for generic emitter.
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// It is loaded further down anyway before it is first used.
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__ add2mem_32(Address(Z_R1_scratch), 1, Z_method);
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}
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#endif
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assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1");
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// Get receiver klass.
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// Must do an explicit check if implicit checks are disabled.
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address npe_addr = __ pc(); // npe == NULL ptr exception
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__ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes());
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const Register rcvr_klass = Z_R1_scratch;
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__ load_klass(rcvr_klass, Z_ARG1);
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// Set method (in case of interpreted method), and destination address.
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int entry_offset = in_bytes(InstanceKlass::vtable_start_offset()) +
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vtable_index * vtableEntry::size_in_bytes();
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#ifndef PRODUCT
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if (DebugVtables) {
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Label L;
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// Check offset vs vtable length.
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const Register vtable_idx = Z_R0_scratch;
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// Count unused bytes.
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// worst case actual size
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padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(vtable_idx, vtable_index*vtableEntry::size_in_bytes(), true);
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assert(Immediate::is_uimm12(in_bytes(InstanceKlass::vtable_length_offset())), "disp to large");
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__ z_cl(vtable_idx, in_bytes(InstanceKlass::vtable_length_offset()), rcvr_klass);
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__ z_brl(L);
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__ z_lghi(Z_ARG3, vtable_index); // Debug code, don't optimize.
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__ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), Z_ARG1, Z_ARG3, false);
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// Count unused bytes (assume worst case here).
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padding_bytes += 12;
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__ bind(L);
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}
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#endif
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int v_off = entry_offset + vtableEntry::method_offset_in_bytes();
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// Duplicate safety code from enc_class Java_Dynamic_Call_dynTOC.
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if (Displacement::is_validDisp(v_off)) {
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__ z_lg(Z_method/*method oop*/, v_off, rcvr_klass/*class oop*/);
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// Account for the load_const in the else path.
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padding_bytes += __ load_const_size();
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} else {
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// Worse case, offset does not fit in displacement field.
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__ load_const(Z_method, v_off); // Z_method temporarily holds the offset value.
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__ z_lg(Z_method/*method oop*/, 0, Z_method/*method offset*/, rcvr_klass/*class oop*/);
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}
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#ifndef PRODUCT
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if (DebugVtables) {
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Label L;
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__ z_ltgr(Z_method, Z_method);
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__ z_brne(L);
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__ stop("Vtable entry is ZERO",102);
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__ bind(L);
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}
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#endif
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address ame_addr = __ pc(); // ame = abstract method error
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// Must do an explicit check if implicit checks are disabled.
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__ null_check(Z_method, Z_R1_scratch, in_bytes(Method::from_compiled_offset()));
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__ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method);
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__ z_br(Z_R1_scratch);
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masm->flush();
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s->set_exception_points(npe_addr, ame_addr);
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return s;
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}
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VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
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const int code_length = VtableStub::pd_code_size_limit(false);
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VtableStub *s = new(code_length) VtableStub(false, vtable_index);
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if (s == NULL) { // Indicates OOM in the code cache.
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return NULL;
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}
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ResourceMark rm;
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CodeBuffer cb(s->entry_point(), code_length);
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MacroAssembler *masm = new MacroAssembler(&cb);
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address start_pc;
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int padding_bytes = 0;
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#if (!defined(PRODUCT) && defined(COMPILER2))
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if (CountCompiledCalls) {
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// Count unused bytes
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// worst case actual size
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padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true);
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// Use generic emitter for direct memory increment.
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// Use Z_tmp_1 as scratch register for generic emitter.
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__ add2mem_32((Z_R1_scratch), 1, Z_tmp_1);
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}
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#endif
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assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1");
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// Entry arguments:
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// Z_method: Interface
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// Z_ARG1: Receiver
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const Register rcvr_klass = Z_tmp_1; // Used to compute itable_entry_addr.
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// Use extra reg to avoid re-load.
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const Register vtable_len = Z_tmp_2; // Used to compute itable_entry_addr.
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const Register itable_entry_addr = Z_R1_scratch;
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const Register itable_interface = Z_R0_scratch;
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// Get receiver klass.
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// Must do an explicit check if implicit checks are disabled.
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address npe_addr = __ pc(); // npe == NULL ptr exception
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__ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes());
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__ load_klass(rcvr_klass, Z_ARG1);
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// Load start of itable entries into itable_entry.
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__ z_llgf(vtable_len, Address(rcvr_klass, InstanceKlass::vtable_length_offset()));
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__ z_sllg(vtable_len, vtable_len, exact_log2(vtableEntry::size_in_bytes()));
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// Loop over all itable entries until desired interfaceOop(Rinterface) found.
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const int vtable_base_offset = in_bytes(InstanceKlass::vtable_start_offset());
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// Count unused bytes.
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start_pc = __ pc();
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__ add2reg_with_index(itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes(), rcvr_klass, vtable_len);
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padding_bytes += 20 - (__ pc() - start_pc);
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const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize;
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Label search;
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__ bind(search);
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// Handle IncompatibleClassChangeError in itable stubs.
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// If the entry is NULL then we've reached the end of the table
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// without finding the expected interface, so throw an exception.
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NearLabel throw_icce;
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__ load_and_test_long(itable_interface, Address(itable_entry_addr));
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__ z_bre(throw_icce); // Throw the exception out-of-line.
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// Count unused bytes.
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start_pc = __ pc();
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__ add2reg(itable_entry_addr, itable_offset_search_inc);
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padding_bytes += 20 - (__ pc() - start_pc);
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__ z_cgr(itable_interface, Z_method);
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__ z_brne(search);
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// Entry found. Itable_entry_addr points to the subsequent entry (itable_offset_search_inc too far).
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// Get offset of vtable for interface.
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const Register vtable_offset = Z_R1_scratch;
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const Register itable_method = rcvr_klass; // Calculated before.
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const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() -
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itableOffsetEntry::interface_offset_in_bytes()) -
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itable_offset_search_inc;
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__ z_llgf(vtable_offset, vtable_offset_offset, itable_entry_addr);
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// Compute itableMethodEntry and get method and entry point for compiler.
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const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) +
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itableMethodEntry::method_offset_in_bytes();
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__ z_lg(Z_method, method_offset, vtable_offset, itable_method);
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#ifndef PRODUCT
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if (DebugVtables) {
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Label ok1;
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__ z_ltgr(Z_method, Z_method);
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__ z_brne(ok1);
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__ stop("method is null",103);
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__ bind(ok1);
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}
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#endif
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address ame_addr = __ pc();
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// Must do an explicit check if implicit checks are disabled.
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if (!ImplicitNullChecks) {
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__ compare64_and_branch(Z_method, (intptr_t) 0, Assembler::bcondEqual, throw_icce);
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}
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__ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method);
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__ z_br(Z_R1_scratch);
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// Handle IncompatibleClassChangeError in itable stubs.
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__ bind(throw_icce);
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// Count unused bytes
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// worst case actual size
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// We force resolving of the call site by jumping to
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// the "handle wrong method" stub, and so let the
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// interpreter runtime do all the dirty work.
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padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::get_handle_wrong_method_stub(), true);
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__ z_br(Z_R1_scratch);
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masm->flush();
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s->set_exception_points(npe_addr, ame_addr);
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return s;
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}
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// In order to tune these parameters, run the JVM with VM options
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// +PrintMiscellaneous and +WizardMode to see information about
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// actual itable stubs. Run it with -Xmx31G -XX:+UseCompressedOops.
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int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
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int size = DebugVtables ? 216 : 0;
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if (CountCompiledCalls) {
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size += 6 * 4;
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}
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if (is_vtable_stub) {
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size += 52;
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} else {
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size += 104;
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}
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if (Universe::narrow_klass_base() != NULL) {
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size += 16; // A guess.
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}
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return size;
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}
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int VtableStub::pd_code_alignment() {
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const unsigned int icache_line_size = 32;
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return icache_line_size;
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}
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