1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016, 2018 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/compiledICHolder.hpp" 32 #include "oops/instanceKlass.hpp" 33 #include "oops/klass.inline.hpp" 34 #include "oops/klassVtable.hpp" 35 #include "runtime/sharedRuntime.hpp" 36 #include "vmreg_s390.inline.hpp" 37 #ifdef COMPILER2 38 #include "opto/runtime.hpp" 39 #endif 40 41 #define __ masm-> 42 43 #ifndef PRODUCT 44 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); 45 #endif 46 47 // Used by compiler only; may use only caller saved, non-argument registers. 48 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { 49 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. 50 const int stub_code_length = code_size_limit(true); 51 VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index); 52 // Can be NULL if there is no free space in the code cache. 53 if (s == NULL) { 54 return NULL; 55 } 56 57 // Count unused bytes in instruction sequences of variable size. 58 // We add them to the computed buffer size in order to avoid 59 // overflow in subsequently generated stubs. 60 address start_pc; 61 int slop_bytes = 0; 62 int slop_delta = 0; 63 64 ResourceMark rm; 65 CodeBuffer cb(s->entry_point(), stub_code_length); 66 MacroAssembler* masm = new MacroAssembler(&cb); 67 68 #if (!defined(PRODUCT) && defined(COMPILER2)) 69 if (CountCompiledCalls) { 70 // worst case actual size 71 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); 72 slop_bytes += slop_delta; 73 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 74 // Use generic emitter for direct memory increment. 75 // Abuse Z_method as scratch register for generic emitter. 76 // It is loaded further down anyway before it is first used. 77 // No dynamic code size variance here, increment is 1, always. 78 __ add2mem_32(Address(Z_R1_scratch), 1, Z_method); 79 } 80 #endif 81 82 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); 83 84 const Register rcvr_klass = Z_R1_scratch; 85 address npe_addr = __ pc(); // npe == NULL ptr exception 86 // check if we must do an explicit check (implicit checks disabled, offset too large). 87 __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes()); 88 // Get receiver klass. 89 __ load_klass(rcvr_klass, Z_ARG1); 90 91 #ifndef PRODUCT 92 if (DebugVtables) { 93 NearLabel L; 94 // Check offset vs vtable length. 95 const Register vtable_idx = Z_R0_scratch; 96 97 // worst case actual size 98 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(vtable_idx, vtable_index*vtableEntry::size(), true); 99 slop_bytes += slop_delta; 100 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 101 102 assert(Displacement::is_shortDisp(in_bytes(Klass::vtable_length_offset())), "disp to large"); 103 __ z_cl(vtable_idx, in_bytes(Klass::vtable_length_offset()), rcvr_klass); 104 __ z_brl(L); 105 __ z_lghi(Z_ARG3, vtable_index); // Debug code, don't optimize. 106 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), Z_ARG1, Z_ARG3, false); 107 // Count unused bytes (assume worst case here). 108 slop_bytes += 12; 109 __ bind(L); 110 } 111 #endif 112 113 int entry_offset = in_bytes(Klass::vtable_start_offset()) + 114 vtable_index * vtableEntry::size_in_bytes(); 115 int v_off = entry_offset + vtableEntry::method_offset_in_bytes(); 116 117 // Set method (in case of interpreted method), and destination address. 118 // Duplicate safety code from enc_class Java_Dynamic_Call_dynTOC. 119 if (Displacement::is_validDisp(v_off)) { 120 __ z_lg(Z_method/*method oop*/, v_off, rcvr_klass/*class oop*/); 121 // Account for the load_const in the else path. 122 slop_delta = __ load_const_size(); 123 } else { 124 // Worse case, offset does not fit in displacement field. 125 // worst case actual size 126 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_method, v_off, true); 127 __ z_lg(Z_method/*method oop*/, 0, Z_method/*method offset*/, rcvr_klass/*class oop*/); 128 } 129 slop_bytes += slop_delta; 130 131 #ifndef PRODUCT 132 if (DebugVtables) { 133 NearLabel L; 134 __ z_ltgr(Z_method, Z_method); 135 __ z_brne(L); 136 __ stop("Vtable entry is ZERO", 102); 137 __ bind(L); 138 } 139 #endif 140 141 // Must do an explicit check if offset too large or implicit checks are disabled. 142 address ame_addr = __ pc(); 143 __ null_check(Z_method, Z_R1_scratch, in_bytes(Method::from_compiled_offset())); 144 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); 145 __ z_br(Z_R1_scratch); 146 147 masm->flush(); 148 bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0); 149 150 return s; 151 } 152 153 VtableStub* VtableStubs::create_itable_stub(int itable_index) { 154 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. 155 const int stub_code_length = code_size_limit(false); 156 VtableStub* s = new(stub_code_length) VtableStub(false, itable_index); 157 // Can be NULL if there is no free space in the code cache. 158 if (s == NULL) { 159 return NULL; 160 } 161 // Count unused bytes in instruction sequences of variable size. 162 // We add them to the computed buffer size in order to avoid 163 // overflow in subsequently generated stubs. 164 address start_pc; 165 int slop_bytes = 0; 166 int slop_delta = 0; 167 168 ResourceMark rm; 169 CodeBuffer cb(s->entry_point(), stub_code_length); 170 MacroAssembler* masm = new MacroAssembler(&cb); 171 172 #if (!defined(PRODUCT) && defined(COMPILER2)) 173 if (CountCompiledCalls) { 174 // worst case actual size 175 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); 176 slop_bytes += slop_delta; 177 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 178 // Use generic emitter for direct memory increment. 179 // Abuse Z_method as scratch register for generic emitter. 180 // It is loaded further down anyway before it is first used. 181 // No dynamic code size variance here, increment is 1, always. 182 __ add2mem_32(Address(Z_R1_scratch), 1, Z_method); 183 } 184 #endif 185 186 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); 187 188 // Entry arguments: 189 // Z_method: Interface 190 // Z_ARG1: Receiver 191 NearLabel no_such_interface; 192 const Register rcvr_klass = Z_tmp_1, 193 interface = Z_tmp_2; 194 195 // Get receiver klass. 196 // Must do an explicit check if offset too large or implicit checks are disabled. 197 address npe_addr = __ pc(); // npe == NULL ptr exception 198 __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes()); 199 __ load_klass(rcvr_klass, Z_ARG1); 200 201 // Receiver subtype check against REFC. 202 __ z_lg(interface, Address(Z_method, CompiledICHolder::holder_klass_offset())); 203 __ lookup_interface_method(rcvr_klass, interface, noreg, 204 noreg, Z_R1, no_such_interface, /*return_method=*/ false); 205 206 // Get Method* and entrypoint for compiler 207 __ z_lg(interface, Address(Z_method, CompiledICHolder::holder_metadata_offset())); 208 __ lookup_interface_method(rcvr_klass, interface, itable_index, 209 Z_method, Z_R1, no_such_interface, /*return_method=*/ true); 210 211 #ifndef PRODUCT 212 if (DebugVtables) { 213 NearLabel ok1; 214 __ z_ltgr(Z_method, Z_method); 215 __ z_brne(ok1); 216 __ stop("method is null", 103); 217 __ bind(ok1); 218 } 219 #endif 220 221 address ame_addr = __ pc(); 222 // Must do an explicit check if implicit checks are disabled. 223 if (!ImplicitNullChecks) { 224 __ compare64_and_branch(Z_method, (intptr_t) 0, Assembler::bcondEqual, no_such_interface); 225 } 226 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); 227 __ z_br(Z_R1_scratch); 228 229 // Handle IncompatibleClassChangeError in itable stubs. 230 __ bind(no_such_interface); 231 // more detailed IncompatibleClassChangeError 232 // we force re-resolving of the call site by jumping to 233 // the "handle wrong method" stub, thus letting the 234 // interpreter runtime do all the dirty work. 235 // worst case actual size 236 slop_delta = __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::get_handle_wrong_method_stub(), true); 237 slop_bytes += slop_delta; 238 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); 239 __ z_br(Z_R1_scratch); 240 241 masm->flush(); 242 bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0); 243 244 return s; 245 } 246 247 int VtableStub::pd_code_alignment() { 248 // System z cache line size is 256 bytes, but octoword-alignment is quite ok. 249 const unsigned int icache_line_size = 32; 250 return icache_line_size; 251 }