1 /* 2 * Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016, 2023 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 "asm/macroAssembler.inline.hpp" 27 #include "code/compiledIC.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/klass.inline.hpp" 33 #include "oops/klassVtable.hpp" 34 #include "runtime/sharedRuntime.hpp" 35 #include "vmreg_s390.inline.hpp" 36 #ifdef COMPILER2 37 #include "opto/runtime.hpp" 38 #endif 39 40 #define __ masm-> 41 42 #ifndef PRODUCT 43 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); 44 #endif 45 46 // Used by compiler only; may use only caller saved, non-argument registers. 47 VtableStub* VtableStubs::create_vtable_stub(int vtable_index, bool caller_is_c1) { 48 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. 49 const int stub_code_length = code_size_limit(true); 50 VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index, caller_is_c1); 51 // Can be null if there is no free space in the code cache. 52 if (s == nullptr) { 53 return nullptr; 54 } 55 56 // Count unused bytes in instruction sequences of variable size. 57 // We add them to the computed buffer size in order to avoid 58 // overflow in subsequently generated stubs. 59 address start_pc; 60 int slop_bytes = 0; 61 int slop_delta = 0; 62 63 ResourceMark rm; 64 CodeBuffer cb(s->entry_point(), stub_code_length); 65 MacroAssembler* masm = new MacroAssembler(&cb); 66 67 #if (!defined(PRODUCT) && defined(COMPILER2)) 68 if (CountCompiledCalls) { 69 // worst case actual size 70 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); 71 slop_bytes += slop_delta; 72 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 73 // Use generic emitter for direct memory increment. 74 // Abuse Z_method as scratch register for generic emitter. 75 // It is loaded further down anyway before it is first used. 76 // No dynamic code size variance here, increment is 1, always. 77 __ add2mem_64(Address(Z_R1_scratch), 1, Z_method); 78 } 79 #endif 80 81 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); 82 83 const Register rcvr_klass = Z_R1_scratch; 84 address npe_addr = __ pc(); // npe is short for null pointer exception 85 // Get receiver klass. 86 __ load_klass(rcvr_klass, Z_ARG1); 87 88 #ifndef PRODUCT 89 if (DebugVtables) { 90 NearLabel L; 91 // Check offset vs vtable length. 92 const Register vtable_idx = Z_R0_scratch; 93 94 // worst case actual size 95 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(vtable_idx, vtable_index*vtableEntry::size(), true); 96 slop_bytes += slop_delta; 97 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 98 99 assert(Displacement::is_shortDisp(in_bytes(Klass::vtable_length_offset())), "disp to large"); 100 __ z_cl(vtable_idx, in_bytes(Klass::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 slop_bytes += 12; 106 __ bind(L); 107 } 108 #endif 109 110 int entry_offset = in_bytes(Klass::vtable_start_offset()) + 111 vtable_index * vtableEntry::size_in_bytes(); 112 int v_off = entry_offset + in_bytes(vtableEntry::method_offset()); 113 114 // Set method (in case of interpreted method), and destination address. 115 // Duplicate safety code from enc_class Java_Dynamic_Call_dynTOC. 116 if (Displacement::is_validDisp(v_off)) { 117 __ z_lg(Z_method/*method*/, v_off, rcvr_klass/*class*/); 118 // Account for the load_const in the else path. 119 slop_delta = __ load_const_size(); 120 } else { 121 // Worse case, offset does not fit in displacement field. 122 // worst case actual size 123 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_method, v_off, true); 124 __ z_lg(Z_method/*method*/, 0, Z_method/*method offset*/, rcvr_klass/*class*/); 125 } 126 slop_bytes += slop_delta; 127 128 #ifndef PRODUCT 129 if (DebugVtables) { 130 NearLabel L; 131 __ z_ltgr(Z_method, Z_method); 132 __ z_brne(L); 133 __ stop("Vtable entry is ZERO", 102); 134 __ bind(L); 135 } 136 #endif 137 138 // Must do an explicit check if offset too large or implicit checks are disabled. 139 address ame_addr = __ pc(); 140 __ null_check(Z_method, Z_R1_scratch, in_bytes(Method::from_compiled_offset())); 141 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); 142 __ z_br(Z_R1_scratch); 143 144 masm->flush(); 145 bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0); 146 147 return s; 148 } 149 150 VtableStub* VtableStubs::create_itable_stub(int itable_index, bool caller_is_c1) { 151 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. 152 const int stub_code_length = code_size_limit(false); 153 VtableStub* s = new(stub_code_length) VtableStub(false, itable_index, caller_is_c1); 154 // Can be null if there is no free space in the code cache. 155 if (s == nullptr) { 156 return nullptr; 157 } 158 159 // Count unused bytes in instruction sequences of variable size. 160 // We add them to the computed buffer size in order to avoid 161 // overflow in subsequently generated stubs. 162 address start_pc; 163 int slop_bytes = 0; 164 int slop_delta = 0; 165 166 ResourceMark rm; 167 CodeBuffer cb(s->entry_point(), stub_code_length); 168 MacroAssembler* masm = new MacroAssembler(&cb); 169 170 #if (!defined(PRODUCT) && defined(COMPILER2)) 171 if (CountCompiledCalls) { 172 // worst case actual size 173 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); 174 slop_bytes += slop_delta; 175 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 176 // Use generic emitter for direct memory increment. 177 // Abuse Z_method as scratch register for generic emitter. 178 // It is loaded further down anyway before it is first used. 179 // No dynamic code size variance here, increment is 1, always. 180 __ add2mem_64(Address(Z_R1_scratch), 1, Z_method); 181 } 182 #endif 183 184 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); 185 186 // Entry arguments: 187 // Z_method: Interface 188 // Z_ARG1: Receiver 189 NearLabel no_such_interface; 190 const Register rcvr_klass = Z_tmp_1, 191 interface = Z_tmp_2; 192 193 // Get receiver klass. 194 // Must do an explicit check if offset too large or implicit checks are disabled. 195 address npe_addr = __ pc(); // npe is short for null pointer exception 196 __ load_klass(rcvr_klass, Z_ARG1); 197 198 // Receiver subtype check against REFC. 199 __ z_lg(interface, Address(Z_method, CompiledICData::itable_refc_klass_offset())); 200 __ lookup_interface_method(rcvr_klass, interface, noreg, 201 noreg, Z_R1, no_such_interface, /*return_method=*/ false); 202 203 // Get Method* and entrypoint for compiler 204 __ z_lg(interface, Address(Z_method, CompiledICData::itable_defc_klass_offset())); 205 __ lookup_interface_method(rcvr_klass, interface, itable_index, 206 Z_method, Z_R1, no_such_interface, /*return_method=*/ true); 207 208 #ifndef PRODUCT 209 if (DebugVtables) { 210 NearLabel ok1; 211 __ z_ltgr(Z_method, Z_method); 212 __ z_brne(ok1); 213 __ stop("method is null", 103); 214 __ bind(ok1); 215 } 216 #endif 217 218 address ame_addr = __ pc(); 219 // Must do an explicit check if implicit checks are disabled. 220 if (!ImplicitNullChecks) { 221 __ compare64_and_branch(Z_method, (intptr_t) 0, Assembler::bcondEqual, no_such_interface); 222 } 223 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); 224 __ z_br(Z_R1_scratch); 225 226 // Handle IncompatibleClassChangeError in itable stubs. 227 __ bind(no_such_interface); 228 // more detailed IncompatibleClassChangeError 229 // we force re-resolving of the call site by jumping to 230 // the "handle wrong method" stub, thus letting the 231 // interpreter runtime do all the dirty work. 232 // worst case actual size 233 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::get_handle_wrong_method_stub(), true); 234 slop_bytes += slop_delta; 235 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 236 __ z_br(Z_R1_scratch); 237 238 masm->flush(); 239 bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0); 240 241 return s; 242 } 243 244 int VtableStub::pd_code_alignment() { 245 // System z cache line size is 256 bytes, but octoword-alignment is quite ok. 246 const unsigned int icache_line_size = 32; 247 return icache_line_size; 248 } --- EOF ---