1/* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26#include "precompiled.hpp" 27#include "asm/macroAssembler.inline.hpp" 28#include "code/vtableStubs.hpp" 29#include "interp_masm_s390.hpp" 30#include "memory/resourceArea.hpp" 31#include "oops/instanceKlass.hpp" 32#include "oops/klassVtable.hpp" 33#include "runtime/sharedRuntime.hpp" 34#include "vmreg_s390.inline.hpp" 35#ifdef COMPILER2 36#include "opto/runtime.hpp" 37#endif 38 39// Machine-dependent part of VtableStubs: create vtableStub of correct 40// size and initialize its code. 41 42#define __ masm-> 43 44#ifndef PRODUCT 45extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); 46#endif 47 48// Used by compiler only; may use only caller saved, non-argument registers. 49VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { 50 51 const int code_length = VtableStub::pd_code_size_limit(true); 52 VtableStub *s = new(code_length) VtableStub(true, vtable_index); 53 if (s == NULL) { // Indicates OOM In the code cache. 54 return NULL; 55 } 56 57 ResourceMark rm; 58 CodeBuffer cb(s->entry_point(), code_length); 59 MacroAssembler *masm = new MacroAssembler(&cb); 60 address start_pc; 61 int padding_bytes = 0; 62 63#if (!defined(PRODUCT) && defined(COMPILER2)) 64 if (CountCompiledCalls) { 65 // Count unused bytes 66 // worst case actual size 67 padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); 68 69 // Use generic emitter for direct memory increment. 70 // Abuse Z_method as scratch register for generic emitter. 71 // It is loaded further down anyway before it is first used. 72 __ add2mem_32(Address(Z_R1_scratch), 1, Z_method); 73 } 74#endif 75 76 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); 77 78 // Get receiver klass. 79 // Must do an explicit check if implicit checks are disabled. 80 address npe_addr = __ pc(); // npe == NULL ptr exception 81 __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes()); 82 const Register rcvr_klass = Z_R1_scratch; 83 __ load_klass(rcvr_klass, Z_ARG1); 84 85 // Set method (in case of interpreted method), and destination address. 86 int entry_offset = in_bytes(InstanceKlass::vtable_start_offset()) + 87 vtable_index * vtableEntry::size_in_bytes(); 88 89#ifndef PRODUCT 90 if (DebugVtables) { 91 Label L; 92 // Check offset vs vtable length. 93 const Register vtable_idx = Z_R0_scratch; 94 95 // Count unused bytes. 96 // worst case actual size 97 padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(vtable_idx, vtable_index*vtableEntry::size_in_bytes(), true); 98 99 assert(Immediate::is_uimm12(in_bytes(InstanceKlass::vtable_length_offset())), "disp to large"); 100 __ z_cl(vtable_idx, in_bytes(InstanceKlass::vtable_length_offset()), rcvr_klass); 101 __ z_brl(L); 102 __ z_lghi(Z_ARG3, vtable_index); // Debug code, don't optimize. 103 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), Z_ARG1, Z_ARG3, false); 104 // Count unused bytes (assume worst case here). 105 padding_bytes += 12; 106 __ bind(L); 107 } 108#endif 109 110 int v_off = entry_offset + vtableEntry::method_offset_in_bytes(); 111 112 // Duplicate safety code from enc_class Java_Dynamic_Call_dynTOC. 113 if (Displacement::is_validDisp(v_off)) { 114 __ z_lg(Z_method/*method oop*/, v_off, rcvr_klass/*class oop*/); 115 // Account for the load_const in the else path. 116 padding_bytes += __ load_const_size(); 117 } else { 118 // Worse case, offset does not fit in displacement field. 119 __ load_const(Z_method, v_off); // Z_method temporarily holds the offset value. 120 __ z_lg(Z_method/*method oop*/, 0, Z_method/*method offset*/, rcvr_klass/*class oop*/); 121 } 122 123#ifndef PRODUCT 124 if (DebugVtables) { 125 Label L; 126 __ z_ltgr(Z_method, Z_method); 127 __ z_brne(L); 128 __ stop("Vtable entry is ZERO",102); 129 __ bind(L); 130 } 131#endif 132 133 address ame_addr = __ pc(); // ame = abstract method error 134 135 // Must do an explicit check if implicit checks are disabled. 136 __ null_check(Z_method, Z_R1_scratch, in_bytes(Method::from_compiled_offset())); 137 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); 138 __ z_br(Z_R1_scratch); 139 140 masm->flush(); 141 142 s->set_exception_points(npe_addr, ame_addr); 143 144 return s; 145} 146 147VtableStub* VtableStubs::create_itable_stub(int vtable_index) { 148 const int code_length = VtableStub::pd_code_size_limit(false); 149 VtableStub *s = new(code_length) VtableStub(false, vtable_index); 150 if (s == NULL) { // Indicates OOM in the code cache. 151 return NULL; 152 } 153 154 ResourceMark rm; 155 CodeBuffer cb(s->entry_point(), code_length); 156 MacroAssembler *masm = new MacroAssembler(&cb); 157 address start_pc; 158 int padding_bytes = 0; 159 160#if (!defined(PRODUCT) && defined(COMPILER2)) 161 if (CountCompiledCalls) { 162 // Count unused bytes 163 // worst case actual size 164 padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); 165 166 // Use generic emitter for direct memory increment. 167 // Use Z_tmp_1 as scratch register for generic emitter. 168 __ add2mem_32((Z_R1_scratch), 1, Z_tmp_1); 169 } 170#endif 171 172 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); 173 174 // Entry arguments: 175 // Z_method: Interface 176 // Z_ARG1: Receiver 177 const Register rcvr_klass = Z_tmp_1; // Used to compute itable_entry_addr. 178 // Use extra reg to avoid re-load. 179 const Register vtable_len = Z_tmp_2; // Used to compute itable_entry_addr. 180 const Register itable_entry_addr = Z_R1_scratch; 181 const Register itable_interface = Z_R0_scratch; 182 183 // Get receiver klass. 184 // Must do an explicit check if implicit checks are disabled. 185 address npe_addr = __ pc(); // npe == NULL ptr exception 186 __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes()); 187 __ load_klass(rcvr_klass, Z_ARG1); 188 189 // Load start of itable entries into itable_entry. 190 __ z_llgf(vtable_len, Address(rcvr_klass, InstanceKlass::vtable_length_offset())); 191 __ z_sllg(vtable_len, vtable_len, exact_log2(vtableEntry::size_in_bytes())); 192 193 // Loop over all itable entries until desired interfaceOop(Rinterface) found. 194 const int vtable_base_offset = in_bytes(InstanceKlass::vtable_start_offset()); 195 // Count unused bytes. 196 start_pc = __ pc(); 197 __ add2reg_with_index(itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes(), rcvr_klass, vtable_len); 198 padding_bytes += 20 - (__ pc() - start_pc); 199 200 const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize; 201 Label search; 202 __ bind(search); 203 204 // Handle IncompatibleClassChangeError in itable stubs. 205 // If the entry is NULL then we've reached the end of the table 206 // without finding the expected interface, so throw an exception. 207 NearLabel throw_icce; 208 __ load_and_test_long(itable_interface, Address(itable_entry_addr)); 209 __ z_bre(throw_icce); // Throw the exception out-of-line. 210 // Count unused bytes. 211 start_pc = __ pc(); 212 __ add2reg(itable_entry_addr, itable_offset_search_inc); 213 padding_bytes += 20 - (__ pc() - start_pc); 214 __ z_cgr(itable_interface, Z_method); 215 __ z_brne(search); 216 217 // Entry found. Itable_entry_addr points to the subsequent entry (itable_offset_search_inc too far). 218 // Get offset of vtable for interface. 219 220 const Register vtable_offset = Z_R1_scratch; 221 const Register itable_method = rcvr_klass; // Calculated before. 222 223 const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() - 224 itableOffsetEntry::interface_offset_in_bytes()) - 225 itable_offset_search_inc; 226 __ z_llgf(vtable_offset, vtable_offset_offset, itable_entry_addr); 227 228 // Compute itableMethodEntry and get method and entry point for compiler. 229 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + 230 itableMethodEntry::method_offset_in_bytes(); 231 232 __ z_lg(Z_method, method_offset, vtable_offset, itable_method); 233 234#ifndef PRODUCT 235 if (DebugVtables) { 236 Label ok1; 237 __ z_ltgr(Z_method, Z_method); 238 __ z_brne(ok1); 239 __ stop("method is null",103); 240 __ bind(ok1); 241 } 242#endif 243 244 address ame_addr = __ pc(); 245 // Must do an explicit check if implicit checks are disabled. 246 if (!ImplicitNullChecks) { 247 __ compare64_and_branch(Z_method, (intptr_t) 0, Assembler::bcondEqual, throw_icce); 248 } 249 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); 250 __ z_br(Z_R1_scratch); 251 252 // Handle IncompatibleClassChangeError in itable stubs. 253 __ bind(throw_icce); 254 // Count unused bytes 255 // worst case actual size 256 // We force resolving of the call site by jumping to 257 // the "handle wrong method" stub, and so let the 258 // interpreter runtime do all the dirty work. 259 padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::get_handle_wrong_method_stub(), true); 260 __ z_br(Z_R1_scratch); 261 262 masm->flush(); 263 264 s->set_exception_points(npe_addr, ame_addr); 265 return s; 266} 267 268// In order to tune these parameters, run the JVM with VM options 269// +PrintMiscellaneous and +WizardMode to see information about 270// actual itable stubs. Run it with -Xmx31G -XX:+UseCompressedOops. 271int VtableStub::pd_code_size_limit(bool is_vtable_stub) { 272 int size = DebugVtables ? 216 : 0; 273 if (CountCompiledCalls) { 274 size += 6 * 4; 275 } 276 if (is_vtable_stub) { 277 size += 52; 278 } else { 279 size += 104; 280 } 281 if (Universe::narrow_klass_base() != NULL) { 282 size += 16; // A guess. 283 } 284 return size; 285} 286 287int VtableStub::pd_code_alignment() { 288 const unsigned int icache_line_size = 32; 289 return icache_line_size; 290} 291