Mercurial > hg > truffle
annotate src/share/vm/interpreter/interpreter.cpp @ 7066:7d815d842ee0
Merge.
| author | Christian Haeubl <haeubl@ssw.jku.at> |
|---|---|
| date | Fri, 23 Nov 2012 11:50:27 +0100 |
| parents | 8c5333c80cfd e522a00b91aa |
| children | 1baf7f1e3f23 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "asm/assembler.hpp" | |
| 27 #include "interpreter/bytecodeHistogram.hpp" | |
| 28 #include "interpreter/bytecodeInterpreter.hpp" | |
| 29 #include "interpreter/interpreter.hpp" | |
| 30 #include "interpreter/interpreterRuntime.hpp" | |
| 31 #include "interpreter/templateTable.hpp" | |
| 32 #include "memory/allocation.inline.hpp" | |
| 33 #include "memory/resourceArea.hpp" | |
| 34 #include "oops/arrayOop.hpp" | |
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35 #include "oops/methodData.hpp" |
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36 #include "oops/method.hpp" |
| 1972 | 37 #include "oops/oop.inline.hpp" |
| 38 #include "prims/forte.hpp" | |
| 39 #include "prims/jvmtiExport.hpp" | |
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40 #include "prims/methodHandles.hpp" |
| 1972 | 41 #include "runtime/handles.inline.hpp" |
| 42 #include "runtime/sharedRuntime.hpp" | |
| 43 #include "runtime/stubRoutines.hpp" | |
| 44 #include "runtime/timer.hpp" | |
| 0 | 45 |
| 46 # define __ _masm-> | |
| 47 | |
| 48 | |
| 49 //------------------------------------------------------------------------------------------------------------------------ | |
| 50 // Implementation of InterpreterCodelet | |
| 51 | |
| 52 void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) { | |
| 53 _description = description; | |
| 54 _bytecode = bytecode; | |
| 55 } | |
| 56 | |
| 57 | |
| 58 void InterpreterCodelet::verify() { | |
| 59 } | |
| 60 | |
| 61 | |
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62 void InterpreterCodelet::print_on(outputStream* st) const { |
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63 ttyLocker ttyl; |
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64 if (PrintInterpreter || PrintMachineCodeToFile) { |
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65 |
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66 st->print_cr("----------------------------------------------------------------------"); |
| 0 | 67 } |
| 68 | |
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69 if (description() != NULL) st->print("%s ", description()); |
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70 if (bytecode() >= 0 ) st->print("%d %s ", bytecode(), Bytecodes::name(bytecode())); |
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71 st->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "] %d bytes", |
| 0 | 72 code_begin(), code_end(), code_size()); |
| 73 | |
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74 if (PrintInterpreter || PrintMachineCodeToFile) { |
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75 Disassembler::decode(code_begin(), code_end(), st, DEBUG_ONLY(_comments) NOT_DEBUG(CodeComments())); |
| 0 | 76 } |
| 77 } | |
| 78 | |
| 79 | |
| 80 //------------------------------------------------------------------------------------------------------------------------ | |
| 81 // Implementation of platform independent aspects of Interpreter | |
| 82 | |
| 83 void AbstractInterpreter::initialize() { | |
| 84 if (_code != NULL) return; | |
| 85 | |
| 86 // make sure 'imported' classes are initialized | |
| 87 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset(); | |
| 88 if (PrintBytecodeHistogram) BytecodeHistogram::reset(); | |
| 89 if (PrintBytecodePairHistogram) BytecodePairHistogram::reset(); | |
| 90 | |
| 91 InvocationCounter::reinitialize(DelayCompilationDuringStartup); | |
| 92 | |
| 93 } | |
| 94 | |
| 95 void AbstractInterpreter::print() { | |
| 96 tty->cr(); | |
| 97 tty->print_cr("----------------------------------------------------------------------"); | |
| 98 tty->print_cr("Interpreter"); | |
| 99 tty->cr(); | |
| 100 tty->print_cr("code size = %6dK bytes", (int)_code->used_space()/1024); | |
| 101 tty->print_cr("total space = %6dK bytes", (int)_code->total_space()/1024); | |
| 102 tty->print_cr("wasted space = %6dK bytes", (int)_code->available_space()/1024); | |
| 103 tty->cr(); | |
| 104 tty->print_cr("# of codelets = %6d" , _code->number_of_stubs()); | |
| 105 tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs()); | |
| 106 tty->cr(); | |
| 107 _code->print(); | |
| 108 tty->print_cr("----------------------------------------------------------------------"); | |
| 109 tty->cr(); | |
| 110 } | |
| 111 | |
| 112 | |
| 113 void interpreter_init() { | |
| 114 Interpreter::initialize(); | |
| 115 #ifndef PRODUCT | |
| 116 if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
| 117 #endif // PRODUCT | |
| 118 // need to hit every safepoint in order to call zapping routine | |
| 119 // register the interpreter | |
| 120 Forte::register_stub( | |
| 121 "Interpreter", | |
| 122 AbstractInterpreter::code()->code_start(), | |
| 123 AbstractInterpreter::code()->code_end() | |
| 124 ); | |
| 125 | |
| 126 // notify JVMTI profiler | |
| 127 if (JvmtiExport::should_post_dynamic_code_generated()) { | |
| 128 JvmtiExport::post_dynamic_code_generated("Interpreter", | |
| 129 AbstractInterpreter::code()->code_start(), | |
| 130 AbstractInterpreter::code()->code_end()); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 //------------------------------------------------------------------------------------------------------------------------ | |
| 135 // Implementation of interpreter | |
| 136 | |
| 137 StubQueue* AbstractInterpreter::_code = NULL; | |
| 138 bool AbstractInterpreter::_notice_safepoints = false; | |
| 139 address AbstractInterpreter::_rethrow_exception_entry = NULL; | |
| 140 | |
| 141 address AbstractInterpreter::_native_entry_begin = NULL; | |
| 142 address AbstractInterpreter::_native_entry_end = NULL; | |
| 143 address AbstractInterpreter::_slow_signature_handler; | |
| 144 address AbstractInterpreter::_entry_table [AbstractInterpreter::number_of_method_entries]; | |
| 145 address AbstractInterpreter::_native_abi_to_tosca [AbstractInterpreter::number_of_result_handlers]; | |
| 146 | |
| 147 //------------------------------------------------------------------------------------------------------------------------ | |
| 148 // Generation of complete interpreter | |
| 149 | |
| 150 AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) { | |
| 151 _masm = NULL; | |
| 152 } | |
| 153 | |
| 154 | |
| 155 static const BasicType types[Interpreter::number_of_result_handlers] = { | |
| 156 T_BOOLEAN, | |
| 157 T_CHAR , | |
| 158 T_BYTE , | |
| 159 T_SHORT , | |
| 160 T_INT , | |
| 161 T_LONG , | |
| 162 T_VOID , | |
| 163 T_FLOAT , | |
| 164 T_DOUBLE , | |
| 165 T_OBJECT | |
| 166 }; | |
| 167 | |
| 168 void AbstractInterpreterGenerator::generate_all() { | |
| 169 | |
| 170 | |
| 171 { CodeletMark cm(_masm, "slow signature handler"); | |
| 172 Interpreter::_slow_signature_handler = generate_slow_signature_handler(); | |
| 173 } | |
| 174 | |
| 175 } | |
| 176 | |
| 177 //------------------------------------------------------------------------------------------------------------------------ | |
| 178 // Entry points | |
| 179 | |
| 180 AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) { | |
| 181 // Abstract method? | |
| 182 if (m->is_abstract()) return abstract; | |
| 183 | |
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184 // Method handle primitive? |
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185 if (m->is_method_handle_intrinsic()) { |
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186 vmIntrinsics::ID id = m->intrinsic_id(); |
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187 assert(MethodHandles::is_signature_polymorphic(id), "must match an intrinsic"); |
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188 MethodKind kind = (MethodKind)( method_handle_invoke_FIRST + |
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189 ((int)id - vmIntrinsics::FIRST_MH_SIG_POLY) ); |
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190 assert(kind <= method_handle_invoke_LAST, "parallel enum ranges"); |
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191 return kind; |
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192 } |
| 710 | 193 |
| 0 | 194 // Native method? |
| 195 // Note: This test must come _before_ the test for intrinsic | |
| 196 // methods. See also comments below. | |
| 197 if (m->is_native()) { | |
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198 assert(!m->is_method_handle_intrinsic(), "overlapping bits here, watch out"); |
| 0 | 199 return m->is_synchronized() ? native_synchronized : native; |
| 200 } | |
| 201 | |
| 202 // Synchronized? | |
| 203 if (m->is_synchronized()) { | |
| 204 return zerolocals_synchronized; | |
| 205 } | |
| 206 | |
| 207 if (RegisterFinalizersAtInit && m->code_size() == 1 && | |
| 208 m->intrinsic_id() == vmIntrinsics::_Object_init) { | |
| 209 // We need to execute the special return bytecode to check for | |
| 210 // finalizer registration so create a normal frame. | |
| 211 return zerolocals; | |
| 212 } | |
| 213 | |
| 214 // Empty method? | |
| 215 if (m->is_empty_method()) { | |
| 216 return empty; | |
| 217 } | |
| 218 | |
| 219 // Special intrinsic method? | |
| 220 // Note: This test must come _after_ the test for native methods, | |
| 221 // otherwise we will run into problems with JDK 1.2, see also | |
| 222 // AbstractInterpreterGenerator::generate_method_entry() for | |
| 223 // for details. | |
| 224 switch (m->intrinsic_id()) { | |
| 225 case vmIntrinsics::_dsin : return java_lang_math_sin ; | |
| 226 case vmIntrinsics::_dcos : return java_lang_math_cos ; | |
| 227 case vmIntrinsics::_dtan : return java_lang_math_tan ; | |
| 228 case vmIntrinsics::_dabs : return java_lang_math_abs ; | |
| 229 case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ; | |
| 230 case vmIntrinsics::_dlog : return java_lang_math_log ; | |
| 231 case vmIntrinsics::_dlog10: return java_lang_math_log10; | |
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232 case vmIntrinsics::_dpow : return java_lang_math_pow ; |
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233 case vmIntrinsics::_dexp : return java_lang_math_exp ; |
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234 |
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235 case vmIntrinsics::_Reference_get: |
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236 return java_lang_ref_reference_get; |
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237 } |
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238 |
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239 // Accessor method? |
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240 if (m->is_accessor()) { |
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241 assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1"); |
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242 return accessor; |
| 0 | 243 } |
| 244 | |
| 245 // Note: for now: zero locals for all non-empty methods | |
| 246 return zerolocals; | |
| 247 } | |
| 248 | |
| 249 | |
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250 void AbstractInterpreter::set_entry_for_kind(AbstractInterpreter::MethodKind kind, address entry) { |
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251 assert(kind >= method_handle_invoke_FIRST && |
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252 kind <= method_handle_invoke_LAST, "late initialization only for MH entry points"); |
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253 assert(_entry_table[kind] == _entry_table[abstract], "previous value must be AME entry"); |
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254 _entry_table[kind] = entry; |
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255 } |
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256 |
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257 |
| 0 | 258 // Return true if the interpreter can prove that the given bytecode has |
| 259 // not yet been executed (in Java semantics, not in actual operation). | |
| 260 bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) { | |
| 2142 | 261 Bytecodes::Code code = method()->code_at(bci); |
| 0 | 262 |
| 2142 | 263 if (!Bytecodes::must_rewrite(code)) { |
| 0 | 264 // might have been reached |
| 265 return false; | |
| 266 } | |
| 267 | |
| 268 // the bytecode might not be rewritten if the method is an accessor, etc. | |
| 269 address ientry = method->interpreter_entry(); | |
| 270 if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) && | |
| 271 ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized)) | |
| 272 return false; // interpreter does not run this method! | |
| 273 | |
| 274 // otherwise, we can be sure this bytecode has never been executed | |
| 275 return true; | |
| 276 } | |
| 277 | |
| 278 | |
| 279 #ifndef PRODUCT | |
| 280 void AbstractInterpreter::print_method_kind(MethodKind kind) { | |
| 281 switch (kind) { | |
| 282 case zerolocals : tty->print("zerolocals" ); break; | |
| 283 case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break; | |
| 284 case native : tty->print("native" ); break; | |
| 285 case native_synchronized : tty->print("native_synchronized" ); break; | |
| 286 case empty : tty->print("empty" ); break; | |
| 287 case accessor : tty->print("accessor" ); break; | |
| 288 case abstract : tty->print("abstract" ); break; | |
| 289 case java_lang_math_sin : tty->print("java_lang_math_sin" ); break; | |
| 290 case java_lang_math_cos : tty->print("java_lang_math_cos" ); break; | |
| 291 case java_lang_math_tan : tty->print("java_lang_math_tan" ); break; | |
| 292 case java_lang_math_abs : tty->print("java_lang_math_abs" ); break; | |
| 293 case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break; | |
| 294 case java_lang_math_log : tty->print("java_lang_math_log" ); break; | |
| 295 case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break; | |
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296 default: |
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297 if (kind >= method_handle_invoke_FIRST && |
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298 kind <= method_handle_invoke_LAST) { |
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299 const char* kind_name = vmIntrinsics::name_at(method_handle_intrinsic(kind)); |
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300 if (kind_name[0] == '_') kind_name = &kind_name[1]; // '_invokeExact' => 'invokeExact' |
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301 tty->print("method_handle_%s", kind_name); |
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302 break; |
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303 } |
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304 ShouldNotReachHere(); |
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305 break; |
| 0 | 306 } |
| 307 } | |
| 308 #endif // PRODUCT | |
| 309 | |
| 310 | |
| 311 //------------------------------------------------------------------------------------------------------------------------ | |
| 312 // Deoptimization support | |
| 313 | |
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314 // If deoptimization happens, this function returns the point of next bytecode to continue execution |
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315 address AbstractInterpreter::deopt_continue_after_entry(Method* method, address bcp, int callee_parameters, bool is_top_frame) { |
| 0 | 316 assert(method->contains(bcp), "just checkin'"); |
| 2142 | 317 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp); |
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318 assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute"); |
| 0 | 319 int bci = method->bci_from(bcp); |
| 320 int length = -1; // initial value for debugging | |
| 321 // compute continuation length | |
| 2142 | 322 length = Bytecodes::length_at(method, bcp); |
| 0 | 323 // compute result type |
| 324 BasicType type = T_ILLEGAL; | |
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325 |
| 0 | 326 switch (code) { |
| 327 case Bytecodes::_invokevirtual : | |
| 328 case Bytecodes::_invokespecial : | |
| 329 case Bytecodes::_invokestatic : | |
| 330 case Bytecodes::_invokeinterface: { | |
| 331 Thread *thread = Thread::current(); | |
| 332 ResourceMark rm(thread); | |
| 333 methodHandle mh(thread, method); | |
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334 type = Bytecode_invoke(mh, bci).result_type(); |
| 0 | 335 // since the cache entry might not be initialized: |
| 336 // (NOT needed for the old calling convension) | |
| 337 if (!is_top_frame) { | |
| 338 int index = Bytes::get_native_u2(bcp+1); | |
| 339 method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters); | |
| 340 } | |
| 341 break; | |
| 342 } | |
| 343 | |
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344 case Bytecodes::_invokedynamic: { |
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345 Thread *thread = Thread::current(); |
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346 ResourceMark rm(thread); |
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347 methodHandle mh(thread, method); |
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348 type = Bytecode_invoke(mh, bci).result_type(); |
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349 // since the cache entry might not be initialized: |
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350 // (NOT needed for the old calling convension) |
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351 if (!is_top_frame) { |
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352 int index = Bytes::get_native_u4(bcp+1); |
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353 method->constants()->invokedynamic_cp_cache_entry_at(index)->set_parameter_size(callee_parameters); |
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354 } |
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355 break; |
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356 } |
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357 |
| 0 | 358 case Bytecodes::_ldc : |
| 359 case Bytecodes::_ldc_w : // fall through | |
| 360 case Bytecodes::_ldc2_w: | |
| 1602 | 361 { |
| 362 Thread *thread = Thread::current(); | |
| 363 ResourceMark rm(thread); | |
| 364 methodHandle mh(thread, method); | |
| 2142 | 365 type = Bytecode_loadconstant(mh, bci).result_type(); |
| 1602 | 366 break; |
| 367 } | |
| 0 | 368 |
| 369 default: | |
| 370 type = Bytecodes::result_type(code); | |
| 371 break; | |
| 372 } | |
| 373 | |
| 374 // return entry point for computed continuation state & bytecode length | |
| 375 return | |
| 376 is_top_frame | |
| 377 ? Interpreter::deopt_entry (as_TosState(type), length) | |
| 378 : Interpreter::return_entry(as_TosState(type), length); | |
| 379 } | |
| 380 | |
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381 // If deoptimization happens, this function returns the point where the interpreter reexecutes |
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382 // the bytecode. |
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383 // Note: Bytecodes::_athrow is a special case in that it does not return |
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384 // Interpreter::deopt_entry(vtos, 0) like others |
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385 address AbstractInterpreter::deopt_reexecute_entry(Method* method, address bcp) { |
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386 assert(method->contains(bcp), "just checkin'"); |
| 2142 | 387 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp); |
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388 #ifdef COMPILER1 |
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389 if(code == Bytecodes::_athrow ) { |
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390 return Interpreter::rethrow_exception_entry(); |
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391 } |
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392 #endif /* COMPILER1 */ |
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393 return Interpreter::deopt_entry(vtos, 0); |
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394 } |
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395 |
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396 #ifdef GRAAL |
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397 |
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398 |
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399 // If deoptimization happens, the interpreter should reexecute these bytecodes. |
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400 // This function mainly helps the compilers to set up the reexecute bit. |
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401 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) { |
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402 switch (code) { |
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403 case Bytecodes::_invokedynamic: |
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404 case Bytecodes::_invokevirtual: |
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405 case Bytecodes::_invokeinterface: |
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406 case Bytecodes::_invokespecial: |
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407 case Bytecodes::_invokestatic: |
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408 return false; |
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409 default: |
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410 return true; |
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411 } |
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412 return true; |
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413 } |
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414 #else |
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415 |
|
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416 // If deoptimization happens, the interpreter should reexecute these bytecodes. |
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417 // This function mainly helps the compilers to set up the reexecute bit. |
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418 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) { |
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419 switch (code) { |
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420 case Bytecodes::_lookupswitch: |
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421 case Bytecodes::_tableswitch: |
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422 case Bytecodes::_fast_binaryswitch: |
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423 case Bytecodes::_fast_linearswitch: |
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424 // recompute condtional expression folded into _if<cond> |
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425 case Bytecodes::_lcmp : |
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426 case Bytecodes::_fcmpl : |
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427 case Bytecodes::_fcmpg : |
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428 case Bytecodes::_dcmpl : |
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429 case Bytecodes::_dcmpg : |
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430 case Bytecodes::_ifnull : |
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431 case Bytecodes::_ifnonnull : |
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432 case Bytecodes::_goto : |
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433 case Bytecodes::_goto_w : |
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434 case Bytecodes::_ifeq : |
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435 case Bytecodes::_ifne : |
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436 case Bytecodes::_iflt : |
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437 case Bytecodes::_ifge : |
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438 case Bytecodes::_ifgt : |
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439 case Bytecodes::_ifle : |
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440 case Bytecodes::_if_icmpeq : |
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441 case Bytecodes::_if_icmpne : |
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442 case Bytecodes::_if_icmplt : |
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443 case Bytecodes::_if_icmpge : |
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444 case Bytecodes::_if_icmpgt : |
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445 case Bytecodes::_if_icmple : |
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446 case Bytecodes::_if_acmpeq : |
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447 case Bytecodes::_if_acmpne : |
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448 // special cases |
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449 case Bytecodes::_getfield : |
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450 case Bytecodes::_putfield : |
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451 case Bytecodes::_getstatic : |
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452 case Bytecodes::_putstatic : |
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453 case Bytecodes::_aastore : |
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454 #ifdef COMPILER1 |
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455 //special case of reexecution |
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456 case Bytecodes::_athrow : |
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457 #endif |
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458 return true; |
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459 |
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460 default: |
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461 return false; |
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462 } |
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463 } |
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Fix reexecute boolean in HotSpot debug information. Introduce "duringCall" flag in FrameState that indicates that the bci of the frame state denotes an invoke that should *not* be reexecuted.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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464 #endif |
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465 |
| 0 | 466 void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) { |
| 467 // Quick & dirty stack overflow checking: bang the stack & handle trap. | |
| 468 // Note that we do the banging after the frame is setup, since the exception | |
| 469 // handling code expects to find a valid interpreter frame on the stack. | |
| 470 // Doing the banging earlier fails if the caller frame is not an interpreter | |
| 471 // frame. | |
| 472 // (Also, the exception throwing code expects to unlock any synchronized | |
| 473 // method receiever, so do the banging after locking the receiver.) | |
| 474 | |
| 475 // Bang each page in the shadow zone. We can't assume it's been done for | |
| 476 // an interpreter frame with greater than a page of locals, so each page | |
| 477 // needs to be checked. Only true for non-native. | |
| 478 if (UseStackBanging) { | |
| 479 const int start_page = native_call ? StackShadowPages : 1; | |
| 480 const int page_size = os::vm_page_size(); | |
| 481 for (int pages = start_page; pages <= StackShadowPages ; pages++) { | |
| 482 __ bang_stack_with_offset(pages*page_size); | |
| 483 } | |
| 484 } | |
| 485 } | |
| 6926 | 486 |
| 487 void AbstractInterpreterGenerator::initialize_method_handle_entries() { | |
| 488 // method handle entry kinds are generated later in MethodHandlesAdapterGenerator::generate: | |
| 489 for (int i = Interpreter::method_handle_invoke_FIRST; i <= Interpreter::method_handle_invoke_LAST; i++) { | |
| 490 Interpreter::MethodKind kind = (Interpreter::MethodKind) i; | |
| 491 Interpreter::_entry_table[kind] = Interpreter::_entry_table[Interpreter::abstract]; | |
| 492 } | |
| 493 } |