1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "asm/macroAssembler.inline.hpp" 27 #include "code/vtableStubs.hpp" 28 #include "interp_masm_sparc.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "oops/instanceKlass.hpp" 31 #include "oops/klassVtable.hpp" 32 #include "runtime/sharedRuntime.hpp" 33 #include "vmreg_sparc.inline.hpp" 34 #ifdef COMPILER2 35 #include "opto/runtime.hpp" 36 #endif 37 38 // machine-dependent part of VtableStubs: create vtableStub of correct size and 39 // initialize its code 40 41 #define __ masm-> 42 43 44 #ifndef PRODUCT 45 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index); 46 #endif 47 48 49 // Used by compiler only; may use only caller saved, non-argument registers 50 // NOTE: %%%% if any change is made to this stub make sure that the function 51 // pd_code_size_limit is changed to ensure the correct size for VtableStub 52 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { 53 const int sparc_code_length = VtableStub::pd_code_size_limit(true); 54 VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index); 55 // Can be NULL if there is no free space in the code cache. 56 if (s == NULL) { 57 return NULL; 58 } 59 60 ResourceMark rm; 61 CodeBuffer cb(s->entry_point(), sparc_code_length); 62 MacroAssembler* masm = new MacroAssembler(&cb); 63 64 #ifndef PRODUCT 65 if (CountCompiledCalls) { 66 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch); 67 } 68 #endif /* PRODUCT */ 69 70 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0"); 71 72 // get receiver klass 73 address npe_addr = __ pc(); 74 __ load_klass(O0, G3_scratch); 75 76 // set Method* (in case of interpreted method), and destination address 77 #ifndef PRODUCT 78 if (DebugVtables) { 79 Label L; 80 // check offset vs vtable length 81 __ ld(G3_scratch, InstanceKlass::vtable_length_offset()*wordSize, G5); 82 __ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L); 83 __ set(vtable_index, O2); 84 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2); 85 __ bind(L); 86 } 87 #endif 88 89 __ lookup_virtual_method(G3_scratch, vtable_index, G5_method); 90 91 #ifndef PRODUCT 92 if (DebugVtables) { 93 Label L; 94 __ br_notnull_short(G5_method, Assembler::pt, L); 95 __ stop("Vtable entry is ZERO"); 96 __ bind(L); 97 } 98 #endif 99 100 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract 101 // NOTE: for vtable dispatches, the vtable entry will never be null. 102 103 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); 104 105 // jump to target (either compiled code or c2iadapter) 106 __ JMP(G3_scratch, 0); 107 // load Method* (in case we call c2iadapter) 108 __ delayed()->nop(); 109 110 masm->flush(); 111 112 if (PrintMiscellaneous && (WizardMode || Verbose)) { 113 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", 114 vtable_index, p2i(s->entry_point()), 115 (int)(s->code_end() - s->entry_point()), 116 (int)(s->code_end() - __ pc())); 117 } 118 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); 119 // shut the door on sizing bugs 120 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one 121 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); 122 123 s->set_exception_points(npe_addr, ame_addr); 124 return s; 125 } 126 127 128 // NOTE: %%%% if any change is made to this stub make sure that the function 129 // pd_code_size_limit is changed to ensure the correct size for VtableStub 130 VtableStub* VtableStubs::create_itable_stub(int itable_index) { 131 const int sparc_code_length = VtableStub::pd_code_size_limit(false); 132 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index); 133 // Can be NULL if there is no free space in the code cache. 134 if (s == NULL) { 135 return NULL; 136 } 137 138 ResourceMark rm; 139 CodeBuffer cb(s->entry_point(), sparc_code_length); 140 MacroAssembler* masm = new MacroAssembler(&cb); 141 142 Register G3_Klass = G3_scratch; 143 Register G5_interface = G5; // Passed in as an argument 144 Label search; 145 146 // Entry arguments: 147 // G5_interface: Interface 148 // O0: Receiver 149 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0"); 150 151 // get receiver klass (also an implicit null-check) 152 address npe_addr = __ pc(); 153 __ load_klass(O0, G3_Klass); 154 155 // Push a new window to get some temp registers. This chops the head of all 156 // my 64-bit %o registers in the LION build, but this is OK because no longs 157 // are passed in the %o registers. Instead, longs are passed in G1 and G4 158 // and so those registers are not available here. 159 __ save(SP,-frame::register_save_words*wordSize,SP); 160 161 #ifndef PRODUCT 162 if (CountCompiledCalls) { 163 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1); 164 } 165 #endif /* PRODUCT */ 166 167 Label throw_icce; 168 169 Register L5_method = L5; 170 __ lookup_interface_method(// inputs: rec. class, interface, itable index 171 G3_Klass, G5_interface, itable_index, 172 // outputs: method, scan temp. reg 173 L5_method, L2, L3, 174 throw_icce); 175 176 #ifndef PRODUCT 177 if (DebugVtables) { 178 Label L01; 179 __ br_notnull_short(L5_method, Assembler::pt, L01); 180 __ stop("Method* is null"); 181 __ bind(L01); 182 } 183 #endif 184 185 // If the following load is through a NULL pointer, we'll take an OS 186 // exception that should translate into an AbstractMethodError. We need the 187 // window count to be correct at that time. 188 __ restore(L5_method, 0, G5_method); 189 // Restore registers *before* the AME point. 190 191 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract 192 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); 193 194 // G5_method: Method* 195 // O0: Receiver 196 // G3_scratch: entry point 197 __ JMP(G3_scratch, 0); 198 __ delayed()->nop(); 199 200 __ bind(throw_icce); 201 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); 202 __ jump_to(icce, G3_scratch); 203 __ delayed()->restore(); 204 205 masm->flush(); 206 207 if (PrintMiscellaneous && (WizardMode || Verbose)) { 208 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", 209 itable_index, p2i(s->entry_point()), 210 (int)(s->code_end() - s->entry_point()), 211 (int)(s->code_end() - __ pc())); 212 } 213 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); 214 // shut the door on sizing bugs 215 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one 216 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); 217 218 s->set_exception_points(npe_addr, ame_addr); 219 return s; 220 } 221 222 223 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { 224 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000; 225 else { 226 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets) 227 if (is_vtable_stub) { 228 // ld;ld;ld,jmp,nop 229 const int basic = 5*BytesPerInstWord + 230 // shift;add for load_klass (only shift with zero heap based) 231 (UseCompressedClassPointers ? 232 MacroAssembler::instr_size_for_decode_klass_not_null() : 0); 233 return basic + slop; 234 } else { 235 const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord + 236 // shift;add for load_klass (only shift with zero heap based) 237 (UseCompressedClassPointers ? 238 MacroAssembler::instr_size_for_decode_klass_not_null() : 0); 239 return (basic + slop); 240 } 241 } 242 243 // In order to tune these parameters, run the JVM with VM options 244 // +PrintMiscellaneous and +WizardMode to see information about 245 // actual itable stubs. Look for lines like this: 246 // itable #1 at 0x5551212[116] left over: 8 247 // Reduce the constants so that the "left over" number is 8 248 // Do not aim at a left-over number of zero, because a very 249 // large vtable or itable offset (> 4K) will require an extra 250 // sethi/or pair of instructions. 251 // 252 // The JVM98 app. _202_jess has a megamorphic interface call. 253 // The itable code looks like this: 254 // Decoding VtableStub itbl[1]@16 255 // ld [ %o0 + 4 ], %g3 256 // save %sp, -64, %sp 257 // ld [ %g3 + 0xe8 ], %l2 258 // sll %l2, 2, %l2 259 // add %l2, 0x134, %l2 260 // and %l2, -8, %l2 ! NOT_LP64 only 261 // add %g3, %l2, %l2 262 // add %g3, 4, %g3 263 // ld [ %l2 ], %l5 264 // brz,pn %l5, throw_icce 265 // cmp %l5, %g5 266 // be %icc, success 267 // add %l2, 8, %l2 268 // loop: 269 // ld [ %l2 ], %l5 270 // brz,pn %l5, throw_icce 271 // cmp %l5, %g5 272 // bne,pn %icc, loop 273 // add %l2, 8, %l2 274 // success: 275 // ld [ %l2 + -4 ], %l2 276 // ld [ %g3 + %l2 ], %l5 277 // restore %l5, 0, %g5 278 // ld [ %g5 + 0x44 ], %g3 279 // jmp %g3 280 // nop 281 // throw_icce: 282 // sethi %hi(throw_ICCE_entry), %g3 283 // ! 5 more instructions here, LP64_ONLY 284 // jmp %g3 + %lo(throw_ICCE_entry) 285 // restore 286 } 287 288 289 int VtableStub::pd_code_alignment() { 290 // UltraSPARC cache line size is 8 instructions: 291 const unsigned int icache_line_size = 32; 292 return icache_line_size; 293 }