1 /* 2 * Copyright (c) 1997, 2011, 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/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" 35 #include "oops/methodDataOop.hpp" 36 #include "oops/methodOop.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "prims/forte.hpp" 39 #include "prims/jvmtiExport.hpp" 40 #include "runtime/handles.inline.hpp" 41 #include "runtime/sharedRuntime.hpp" 42 #include "runtime/stubRoutines.hpp" 43 #include "runtime/timer.hpp" 44 45 # define __ _masm-> 46 47 48 //------------------------------------------------------------------------------------------------------------------------ 49 // Implementation of InterpreterCodelet 50 51 void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) { 52 _description = description; 53 _bytecode = bytecode; 54 } 55 56 57 void InterpreterCodelet::verify() { 58 } 59 60 61 void InterpreterCodelet::print_on(outputStream* st) const { 62 if (PrintInterpreter) { 63 st->cr(); 64 st->print_cr("----------------------------------------------------------------------"); 65 } 66 67 if (description() != NULL) st->print("%s ", description()); 68 if (bytecode() >= 0 ) st->print("%d %s ", bytecode(), Bytecodes::name(bytecode())); 69 st->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "] %d bytes", 70 code_begin(), code_end(), code_size()); 71 72 if (PrintInterpreter) { 73 st->cr(); 74 Disassembler::decode(code_begin(), code_end(), st); 75 } 76 } 77 78 79 //------------------------------------------------------------------------------------------------------------------------ 80 // Implementation of platform independent aspects of Interpreter 81 82 void AbstractInterpreter::initialize() { 83 if (_code != NULL) return; 84 85 // make sure 'imported' classes are initialized 86 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset(); 87 if (PrintBytecodeHistogram) BytecodeHistogram::reset(); 88 if (PrintBytecodePairHistogram) BytecodePairHistogram::reset(); 89 90 InvocationCounter::reinitialize(DelayCompilationDuringStartup); 91 92 } 93 94 void AbstractInterpreter::print() { 95 tty->cr(); 96 tty->print_cr("----------------------------------------------------------------------"); 97 tty->print_cr("Interpreter"); 98 tty->cr(); 99 tty->print_cr("code size = %6dK bytes", (int)_code->used_space()/1024); 100 tty->print_cr("total space = %6dK bytes", (int)_code->total_space()/1024); 101 tty->print_cr("wasted space = %6dK bytes", (int)_code->available_space()/1024); 102 tty->cr(); 103 tty->print_cr("# of codelets = %6d" , _code->number_of_stubs()); 104 tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs()); 105 tty->cr(); 106 _code->print(); 107 tty->print_cr("----------------------------------------------------------------------"); 108 tty->cr(); 109 } 110 111 112 void interpreter_init() { 113 Interpreter::initialize(); 114 #ifndef PRODUCT 115 if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 116 #endif // PRODUCT 117 // need to hit every safepoint in order to call zapping routine 118 // register the interpreter 119 Forte::register_stub( 120 "Interpreter", 121 AbstractInterpreter::code()->code_start(), 122 AbstractInterpreter::code()->code_end() 123 ); 124 125 // notify JVMTI profiler 126 if (JvmtiExport::should_post_dynamic_code_generated()) { 127 JvmtiExport::post_dynamic_code_generated("Interpreter", 128 AbstractInterpreter::code()->code_start(), 129 AbstractInterpreter::code()->code_end()); 130 } 131 } 132 133 //------------------------------------------------------------------------------------------------------------------------ 134 // Implementation of interpreter 135 136 StubQueue* AbstractInterpreter::_code = NULL; 137 bool AbstractInterpreter::_notice_safepoints = false; 138 address AbstractInterpreter::_rethrow_exception_entry = NULL; 139 140 address AbstractInterpreter::_native_entry_begin = NULL; 141 address AbstractInterpreter::_native_entry_end = NULL; 142 address AbstractInterpreter::_slow_signature_handler; 143 address AbstractInterpreter::_entry_table [AbstractInterpreter::number_of_method_entries]; 144 address AbstractInterpreter::_native_abi_to_tosca [AbstractInterpreter::number_of_result_handlers]; 145 146 //------------------------------------------------------------------------------------------------------------------------ 147 // Generation of complete interpreter 148 149 AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) { 150 _masm = NULL; 151 } 152 153 154 static const BasicType types[Interpreter::number_of_result_handlers] = { 155 T_BOOLEAN, 156 T_CHAR , 157 T_BYTE , 158 T_SHORT , 159 T_INT , 160 T_LONG , 161 T_VOID , 162 T_FLOAT , 163 T_DOUBLE , 164 T_OBJECT 165 }; 166 167 void AbstractInterpreterGenerator::generate_all() { 168 169 170 { CodeletMark cm(_masm, "slow signature handler"); 171 Interpreter::_slow_signature_handler = generate_slow_signature_handler(); 172 } 173 174 } 175 176 //------------------------------------------------------------------------------------------------------------------------ 177 // Entry points 178 179 AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) { 180 // Abstract method? 181 if (m->is_abstract()) return abstract; 182 183 // Invoker for method handles? 184 if (m->is_method_handle_invoke()) return method_handle; 185 186 // Native method? 187 // Note: This test must come _before_ the test for intrinsic 188 // methods. See also comments below. 189 if (m->is_native()) { 190 assert(!m->is_method_handle_invoke(), "overlapping bits here, watch out"); 191 return m->is_synchronized() ? native_synchronized : native; 192 } 193 194 // Synchronized? 195 if (m->is_synchronized()) { 196 return zerolocals_synchronized; 197 } 198 199 if (RegisterFinalizersAtInit && m->code_size() == 1 && 200 m->intrinsic_id() == vmIntrinsics::_Object_init) { 201 // We need to execute the special return bytecode to check for 202 // finalizer registration so create a normal frame. 203 return zerolocals; 204 } 205 206 // Empty method? 207 if (m->is_empty_method()) { 208 return empty; 209 } 210 211 // Accessor method? 212 if (m->is_accessor()) { 213 assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1"); 214 return accessor; 215 } 216 217 // Special intrinsic method? 218 // Note: This test must come _after_ the test for native methods, 219 // otherwise we will run into problems with JDK 1.2, see also 220 // AbstractInterpreterGenerator::generate_method_entry() for 221 // for details. 222 switch (m->intrinsic_id()) { 223 case vmIntrinsics::_dsin : return java_lang_math_sin ; 224 case vmIntrinsics::_dcos : return java_lang_math_cos ; 225 case vmIntrinsics::_dtan : return java_lang_math_tan ; 226 case vmIntrinsics::_dabs : return java_lang_math_abs ; 227 case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ; 228 case vmIntrinsics::_dlog : return java_lang_math_log ; 229 case vmIntrinsics::_dlog10: return java_lang_math_log10; 230 } 231 232 // Note: for now: zero locals for all non-empty methods 233 return zerolocals; 234 } 235 236 237 // Return true if the interpreter can prove that the given bytecode has 238 // not yet been executed (in Java semantics, not in actual operation). 239 bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) { 240 Bytecodes::Code code = method()->code_at(bci); 241 242 if (!Bytecodes::must_rewrite(code)) { 243 // might have been reached 244 return false; 245 } 246 247 // the bytecode might not be rewritten if the method is an accessor, etc. 248 address ientry = method->interpreter_entry(); 249 if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) && 250 ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized)) 251 return false; // interpreter does not run this method! 252 253 // otherwise, we can be sure this bytecode has never been executed 254 return true; 255 } 256 257 258 #ifndef PRODUCT 259 void AbstractInterpreter::print_method_kind(MethodKind kind) { 260 switch (kind) { 261 case zerolocals : tty->print("zerolocals" ); break; 262 case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break; 263 case native : tty->print("native" ); break; 264 case native_synchronized : tty->print("native_synchronized" ); break; 265 case empty : tty->print("empty" ); break; 266 case accessor : tty->print("accessor" ); break; 267 case abstract : tty->print("abstract" ); break; 268 case method_handle : tty->print("method_handle" ); break; 269 case java_lang_math_sin : tty->print("java_lang_math_sin" ); break; 270 case java_lang_math_cos : tty->print("java_lang_math_cos" ); break; 271 case java_lang_math_tan : tty->print("java_lang_math_tan" ); break; 272 case java_lang_math_abs : tty->print("java_lang_math_abs" ); break; 273 case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break; 274 case java_lang_math_log : tty->print("java_lang_math_log" ); break; 275 case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break; 276 default : ShouldNotReachHere(); 277 } 278 } 279 #endif // PRODUCT 280 281 282 //------------------------------------------------------------------------------------------------------------------------ 283 // Deoptimization support 284 285 // If deoptimization happens, this function returns the point of next bytecode to continue execution 286 address AbstractInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) { 287 assert(method->contains(bcp), "just checkin'"); 288 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp); 289 assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute"); 290 int bci = method->bci_from(bcp); 291 int length = -1; // initial value for debugging 292 // compute continuation length 293 length = Bytecodes::length_at(method, bcp); 294 // compute result type 295 BasicType type = T_ILLEGAL; 296 297 switch (code) { 298 case Bytecodes::_invokevirtual : 299 case Bytecodes::_invokespecial : 300 case Bytecodes::_invokestatic : 301 case Bytecodes::_invokeinterface: { 302 Thread *thread = Thread::current(); 303 ResourceMark rm(thread); 304 methodHandle mh(thread, method); 305 type = Bytecode_invoke(mh, bci).result_type(); 306 // since the cache entry might not be initialized: 307 // (NOT needed for the old calling convension) 308 if (!is_top_frame) { 309 int index = Bytes::get_native_u2(bcp+1); 310 method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters); 311 } 312 break; 313 } 314 315 case Bytecodes::_invokedynamic: { 316 Thread *thread = Thread::current(); 317 ResourceMark rm(thread); 318 methodHandle mh(thread, method); 319 type = Bytecode_invoke(mh, bci).result_type(); 320 // since the cache entry might not be initialized: 321 // (NOT needed for the old calling convension) 322 if (!is_top_frame) { 323 int index = Bytes::get_native_u4(bcp+1); 324 method->constants()->cache()->secondary_entry_at(index)->set_parameter_size(callee_parameters); 325 } 326 break; 327 } 328 329 case Bytecodes::_ldc : 330 case Bytecodes::_ldc_w : // fall through 331 case Bytecodes::_ldc2_w: 332 { 333 Thread *thread = Thread::current(); 334 ResourceMark rm(thread); 335 methodHandle mh(thread, method); 336 type = Bytecode_loadconstant(mh, bci).result_type(); 337 break; 338 } 339 340 default: 341 type = Bytecodes::result_type(code); 342 break; 343 } 344 345 // return entry point for computed continuation state & bytecode length 346 return 347 is_top_frame 348 ? Interpreter::deopt_entry (as_TosState(type), length) 349 : Interpreter::return_entry(as_TosState(type), length); 350 } 351 352 // If deoptimization happens, this function returns the point where the interpreter reexecutes 353 // the bytecode. 354 // Note: Bytecodes::_athrow is a special case in that it does not return 355 // Interpreter::deopt_entry(vtos, 0) like others 356 address AbstractInterpreter::deopt_reexecute_entry(methodOop method, address bcp) { 357 assert(method->contains(bcp), "just checkin'"); 358 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp); 359 #ifdef COMPILER1 360 if(code == Bytecodes::_athrow ) { 361 return Interpreter::rethrow_exception_entry(); 362 } 363 #endif /* COMPILER1 */ 364 return Interpreter::deopt_entry(vtos, 0); 365 } 366 367 // If deoptimization happens, the interpreter should reexecute these bytecodes. 368 // This function mainly helps the compilers to set up the reexecute bit. 369 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) { 370 switch (code) { 371 case Bytecodes::_lookupswitch: 372 case Bytecodes::_tableswitch: 373 case Bytecodes::_fast_binaryswitch: 374 case Bytecodes::_fast_linearswitch: 375 // recompute condtional expression folded into _if<cond> 376 case Bytecodes::_lcmp : 377 case Bytecodes::_fcmpl : 378 case Bytecodes::_fcmpg : 379 case Bytecodes::_dcmpl : 380 case Bytecodes::_dcmpg : 381 case Bytecodes::_ifnull : 382 case Bytecodes::_ifnonnull : 383 case Bytecodes::_goto : 384 case Bytecodes::_goto_w : 385 case Bytecodes::_ifeq : 386 case Bytecodes::_ifne : 387 case Bytecodes::_iflt : 388 case Bytecodes::_ifge : 389 case Bytecodes::_ifgt : 390 case Bytecodes::_ifle : 391 case Bytecodes::_if_icmpeq : 392 case Bytecodes::_if_icmpne : 393 case Bytecodes::_if_icmplt : 394 case Bytecodes::_if_icmpge : 395 case Bytecodes::_if_icmpgt : 396 case Bytecodes::_if_icmple : 397 case Bytecodes::_if_acmpeq : 398 case Bytecodes::_if_acmpne : 399 // special cases 400 case Bytecodes::_getfield : 401 case Bytecodes::_putfield : 402 case Bytecodes::_getstatic : 403 case Bytecodes::_putstatic : 404 case Bytecodes::_aastore : 405 #ifdef COMPILER1 406 //special case of reexecution 407 case Bytecodes::_athrow : 408 #endif 409 return true; 410 411 default: 412 return false; 413 } 414 } 415 416 void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) { 417 // Quick & dirty stack overflow checking: bang the stack & handle trap. 418 // Note that we do the banging after the frame is setup, since the exception 419 // handling code expects to find a valid interpreter frame on the stack. 420 // Doing the banging earlier fails if the caller frame is not an interpreter 421 // frame. 422 // (Also, the exception throwing code expects to unlock any synchronized 423 // method receiever, so do the banging after locking the receiver.) 424 425 // Bang each page in the shadow zone. We can't assume it's been done for 426 // an interpreter frame with greater than a page of locals, so each page 427 // needs to be checked. Only true for non-native. 428 if (UseStackBanging) { 429 const int start_page = native_call ? StackShadowPages : 1; 430 const int page_size = os::vm_page_size(); 431 for (int pages = start_page; pages <= StackShadowPages ; pages++) { 432 __ bang_stack_with_offset(pages*page_size); 433 } 434 } 435 }