author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 46280 | hotspot/src/cpu/s390/vm/vtableStubs_s390.cpp@6eef3d367beb |
child 48585 | d9fcb7ba8133 |
permissions | -rw-r--r-- |
42065 | 1 |
/* |
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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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46280
6eef3d367beb
8175269: [s390] cleanup calls to vtable_start_offset() and vtable_length_offset()
lucy
parents:
42065
diff
changeset
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int entry_offset = in_bytes(Klass::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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46280
6eef3d367beb
8175269: [s390] cleanup calls to vtable_start_offset() and vtable_length_offset()
lucy
parents:
42065
diff
changeset
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assert(Immediate::is_uimm12(in_bytes(Klass::vtable_length_offset())), "disp to large"); |
6eef3d367beb
8175269: [s390] cleanup calls to vtable_start_offset() and vtable_length_offset()
lucy
parents:
42065
diff
changeset
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__ z_cl(vtable_idx, in_bytes(Klass::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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46280
6eef3d367beb
8175269: [s390] cleanup calls to vtable_start_offset() and vtable_length_offset()
lucy
parents:
42065
diff
changeset
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__ z_llgf(vtable_len, Address(rcvr_klass, Klass::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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46280
6eef3d367beb
8175269: [s390] cleanup calls to vtable_start_offset() and vtable_length_offset()
lucy
parents:
42065
diff
changeset
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const int vtable_base_offset = in_bytes(Klass::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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} |