1 /*
   2  * Copyright (c) 1997, 2017, 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.hpp"
  27 #include "asm/macroAssembler.inline.hpp"
  28 #include "compiler/disassembler.hpp"
  29 #include "interpreter/bytecodeHistogram.hpp"
  30 #include "interpreter/bytecodeInterpreter.hpp"
  31 #include "interpreter/interpreter.hpp"
  32 #include "interpreter/interpreterRuntime.hpp"
  33 #include "interpreter/interp_masm.hpp"
  34 #include "interpreter/templateTable.hpp"
  35 #include "memory/allocation.inline.hpp"
  36 #include "memory/metaspaceShared.hpp"
  37 #include "memory/resourceArea.hpp"
  38 #include "oops/arrayOop.hpp"
  39 #include "oops/methodData.hpp"
  40 #include "oops/method.hpp"
  41 #include "oops/oop.inline.hpp"
  42 #include "prims/forte.hpp"
  43 #include "prims/jvmtiExport.hpp"
  44 #include "prims/methodHandles.hpp"
  45 #include "runtime/handles.inline.hpp"
  46 #include "runtime/sharedRuntime.hpp"
  47 #include "runtime/stubRoutines.hpp"
  48 #include "runtime/timer.hpp"
  49 
  50 # define __ _masm->
  51 
  52 //------------------------------------------------------------------------------------------------------------------------
  53 // Implementation of platform independent aspects of Interpreter
  54 
  55 void AbstractInterpreter::initialize() {
  56   if (_code != NULL) return;
  57 
  58   // make sure 'imported' classes are initialized
  59   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset();
  60   if (PrintBytecodeHistogram)                                BytecodeHistogram::reset();
  61   if (PrintBytecodePairHistogram)                            BytecodePairHistogram::reset();
  62 
  63   InvocationCounter::reinitialize(DelayCompilationDuringStartup);
  64 
  65 }
  66 
  67 void AbstractInterpreter::print() {
  68   tty->cr();
  69   tty->print_cr("----------------------------------------------------------------------");
  70   tty->print_cr("Interpreter");
  71   tty->cr();
  72   tty->print_cr("code size        = %6dK bytes", (int)_code->used_space()/1024);
  73   tty->print_cr("total space      = %6dK bytes", (int)_code->total_space()/1024);
  74   tty->print_cr("wasted space     = %6dK bytes", (int)_code->available_space()/1024);
  75   tty->cr();
  76   tty->print_cr("# of codelets    = %6d"      , _code->number_of_stubs());
  77   if (_code->number_of_stubs() != 0) {
  78     tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs());
  79     tty->cr();
  80   }
  81   _code->print();
  82   tty->print_cr("----------------------------------------------------------------------");
  83   tty->cr();
  84 }
  85 
  86 
  87 //------------------------------------------------------------------------------------------------------------------------
  88 // Implementation of interpreter
  89 
  90 StubQueue* AbstractInterpreter::_code                                       = NULL;
  91 bool       AbstractInterpreter::_notice_safepoints                          = false;
  92 address    AbstractInterpreter::_rethrow_exception_entry                    = NULL;
  93 
  94 address    AbstractInterpreter::_native_entry_begin                         = NULL;
  95 address    AbstractInterpreter::_native_entry_end                           = NULL;
  96 address    AbstractInterpreter::_slow_signature_handler;
  97 address    AbstractInterpreter::_entry_table            [AbstractInterpreter::number_of_method_entries];
  98 address    AbstractInterpreter::_cds_entry_table        [AbstractInterpreter::number_of_method_entries];
  99 address    AbstractInterpreter::_native_abi_to_tosca    [AbstractInterpreter::number_of_result_handlers];
 100 
 101 //------------------------------------------------------------------------------------------------------------------------
 102 // Generation of complete interpreter
 103 
 104 AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) {
 105   _masm                      = NULL;
 106 }
 107 
 108 
 109 //------------------------------------------------------------------------------------------------------------------------
 110 // Entry points
 111 
 112 AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(const methodHandle& m) {
 113   // Abstract method?
 114   if (m->is_abstract()) return abstract;
 115 
 116   // Method handle primitive?
 117   if (m->is_method_handle_intrinsic()) {
 118     vmIntrinsics::ID id = m->intrinsic_id();
 119     assert(MethodHandles::is_signature_polymorphic(id), "must match an intrinsic");
 120     MethodKind kind = (MethodKind)( method_handle_invoke_FIRST +
 121                                     ((int)id - vmIntrinsics::FIRST_MH_SIG_POLY) );
 122     assert(kind <= method_handle_invoke_LAST, "parallel enum ranges");
 123     return kind;
 124   }
 125 
 126 #ifndef CC_INTERP
 127   switch (m->intrinsic_id()) {
 128     // Use optimized stub code for CRC32 native methods.
 129     case vmIntrinsics::_updateCRC32            : return java_util_zip_CRC32_update;
 130     case vmIntrinsics::_updateBytesCRC32       : return java_util_zip_CRC32_updateBytes;
 131     case vmIntrinsics::_updateByteBufferCRC32  : return java_util_zip_CRC32_updateByteBuffer;
 132     // Use optimized stub code for CRC32C methods.
 133     case vmIntrinsics::_updateBytesCRC32C             : return java_util_zip_CRC32C_updateBytes;
 134     case vmIntrinsics::_updateDirectByteBufferCRC32C  : return java_util_zip_CRC32C_updateDirectByteBuffer;
 135     case vmIntrinsics::_intBitsToFloat:      return java_lang_Float_intBitsToFloat;
 136     case vmIntrinsics::_floatToRawIntBits:   return java_lang_Float_floatToRawIntBits;
 137     case vmIntrinsics::_longBitsToDouble:    return java_lang_Double_longBitsToDouble;
 138     case vmIntrinsics::_doubleToRawLongBits: return java_lang_Double_doubleToRawLongBits;
 139     default:                                 break;
 140   }
 141 #endif // CC_INTERP
 142 
 143   // Native method?
 144   // Note: This test must come _before_ the test for intrinsic
 145   //       methods. See also comments below.
 146   if (m->is_native()) {
 147     assert(!m->is_method_handle_intrinsic(), "overlapping bits here, watch out");
 148     return m->is_synchronized() ? native_synchronized : native;
 149   }
 150 
 151   // Synchronized?
 152   if (m->is_synchronized()) {
 153     return zerolocals_synchronized;
 154   }
 155 
 156   if (RegisterFinalizersAtInit && m->code_size() == 1 &&
 157       m->intrinsic_id() == vmIntrinsics::_Object_init) {
 158     // We need to execute the special return bytecode to check for
 159     // finalizer registration so create a normal frame.
 160     return zerolocals;
 161   }
 162 
 163   // Empty method?
 164   if (m->is_empty_method()) {
 165     return empty;
 166   }
 167 
 168   // Special intrinsic method?
 169   // Note: This test must come _after_ the test for native methods,
 170   //       otherwise we will run into problems with JDK 1.2, see also
 171   //       TemplateInterpreterGenerator::generate_method_entry() for
 172   //       for details.
 173   switch (m->intrinsic_id()) {
 174     case vmIntrinsics::_dsin  : return java_lang_math_sin  ;
 175     case vmIntrinsics::_dcos  : return java_lang_math_cos  ;
 176     case vmIntrinsics::_dtan  : return java_lang_math_tan  ;
 177     case vmIntrinsics::_dabs  : return java_lang_math_abs  ;
 178     case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
 179     case vmIntrinsics::_dlog  : return java_lang_math_log  ;
 180     case vmIntrinsics::_dlog10: return java_lang_math_log10;
 181     case vmIntrinsics::_dpow  : return java_lang_math_pow  ;
 182     case vmIntrinsics::_dexp  : return java_lang_math_exp  ;
 183     case vmIntrinsics::_fmaD  : return java_lang_math_fmaD ;
 184     case vmIntrinsics::_fmaF  : return java_lang_math_fmaF ;
 185 
 186     case vmIntrinsics::_Reference_get
 187                               : return java_lang_ref_reference_get;


 188     default                   : break;
 189   }
 190 
 191   // Accessor method?
 192   if (m->is_getter()) {
 193     // TODO: We should have used ::is_accessor above, but fast accessors in Zero expect only getters.
 194     // See CppInterpreter::accessor_entry in cppInterpreter_zero.cpp. This should be fixed in Zero,
 195     // then the call above updated to ::is_accessor
 196     assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
 197     return accessor;
 198   }
 199 
 200   // Note: for now: zero locals for all non-empty methods
 201   return zerolocals;
 202 }
 203 
 204 #if INCLUDE_CDS
 205 
 206 address AbstractInterpreter::get_trampoline_code_buffer(AbstractInterpreter::MethodKind kind) {
 207   const size_t trampoline_size = SharedRuntime::trampoline_size();
 208   address addr = MetaspaceShared::cds_i2i_entry_code_buffers((size_t)(AbstractInterpreter::number_of_method_entries) * trampoline_size);
 209   addr += (size_t)(kind) * trampoline_size;
 210 
 211   return addr;
 212 }
 213 
 214 void AbstractInterpreter::update_cds_entry_table(AbstractInterpreter::MethodKind kind) {
 215   if (DumpSharedSpaces || UseSharedSpaces) {
 216     address trampoline = get_trampoline_code_buffer(kind);
 217     _cds_entry_table[kind] = trampoline;
 218 
 219     CodeBuffer buffer(trampoline, (int)(SharedRuntime::trampoline_size()));
 220     MacroAssembler _masm(&buffer);
 221     SharedRuntime::generate_trampoline(&_masm, _entry_table[kind]);
 222 
 223     if (PrintInterpreter) {
 224       Disassembler::decode(buffer.insts_begin(), buffer.insts_end());
 225     }
 226   }
 227 }
 228 
 229 #endif
 230 
 231 void AbstractInterpreter::set_entry_for_kind(AbstractInterpreter::MethodKind kind, address entry) {
 232   assert(kind >= method_handle_invoke_FIRST &&
 233          kind <= method_handle_invoke_LAST, "late initialization only for MH entry points");
 234   assert(_entry_table[kind] == _entry_table[abstract], "previous value must be AME entry");
 235   _entry_table[kind] = entry;
 236 
 237   update_cds_entry_table(kind);
 238 }
 239 
 240 // Return true if the interpreter can prove that the given bytecode has
 241 // not yet been executed (in Java semantics, not in actual operation).
 242 bool AbstractInterpreter::is_not_reached(const methodHandle& method, int bci) {
 243   Bytecodes::Code code = method()->code_at(bci);
 244 
 245   if (!Bytecodes::must_rewrite(code)) {
 246     // might have been reached
 247     return false;
 248   }
 249 
 250   // the bytecode might not be rewritten if the method is an accessor, etc.
 251   address ientry = method->interpreter_entry();
 252   if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
 253       ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
 254     return false;  // interpreter does not run this method!
 255 
 256   // otherwise, we can be sure this bytecode has never been executed
 257   return true;
 258 }
 259 
 260 
 261 #ifndef PRODUCT
 262 void AbstractInterpreter::print_method_kind(MethodKind kind) {
 263   switch (kind) {
 264     case zerolocals             : tty->print("zerolocals"             ); break;
 265     case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
 266     case native                 : tty->print("native"                 ); break;
 267     case native_synchronized    : tty->print("native_synchronized"    ); break;
 268     case empty                  : tty->print("empty"                  ); break;
 269     case accessor               : tty->print("accessor"               ); break;
 270     case abstract               : tty->print("abstract"               ); break;
 271     case java_lang_math_sin     : tty->print("java_lang_math_sin"     ); break;
 272     case java_lang_math_cos     : tty->print("java_lang_math_cos"     ); break;
 273     case java_lang_math_tan     : tty->print("java_lang_math_tan"     ); break;
 274     case java_lang_math_abs     : tty->print("java_lang_math_abs"     ); break;
 275     case java_lang_math_sqrt    : tty->print("java_lang_math_sqrt"    ); break;
 276     case java_lang_math_log     : tty->print("java_lang_math_log"     ); break;
 277     case java_lang_math_log10   : tty->print("java_lang_math_log10"   ); break;
 278     case java_lang_math_fmaD    : tty->print("java_lang_math_fmaD"    ); break;
 279     case java_lang_math_fmaF    : tty->print("java_lang_math_fmaF"    ); break;
 280     case java_util_zip_CRC32_update           : tty->print("java_util_zip_CRC32_update"); break;
 281     case java_util_zip_CRC32_updateBytes      : tty->print("java_util_zip_CRC32_updateBytes"); break;
 282     case java_util_zip_CRC32_updateByteBuffer : tty->print("java_util_zip_CRC32_updateByteBuffer"); break;
 283     case java_util_zip_CRC32C_updateBytes     : tty->print("java_util_zip_CRC32C_updateBytes"); break;
 284     case java_util_zip_CRC32C_updateDirectByteBuffer: tty->print("java_util_zip_CRC32C_updateDirectByteByffer"); break;
 285     default:
 286       if (kind >= method_handle_invoke_FIRST &&
 287           kind <= method_handle_invoke_LAST) {
 288         const char* kind_name = vmIntrinsics::name_at(method_handle_intrinsic(kind));
 289         if (kind_name[0] == '_')  kind_name = &kind_name[1];  // '_invokeExact' => 'invokeExact'
 290         tty->print("method_handle_%s", kind_name);
 291         break;
 292       }
 293       ShouldNotReachHere();
 294       break;
 295   }
 296 }
 297 #endif // PRODUCT
 298 
 299 
 300 //------------------------------------------------------------------------------------------------------------------------
 301 // Deoptimization support
 302 
 303 /**
 304  * If a deoptimization happens, this function returns the point of next bytecode to continue execution.
 305  */
 306 address AbstractInterpreter::deopt_continue_after_entry(Method* method, address bcp, int callee_parameters, bool is_top_frame) {
 307   assert(method->contains(bcp), "just checkin'");
 308 
 309   // Get the original and rewritten bytecode.
 310   Bytecodes::Code code = Bytecodes::java_code_at(method, bcp);
 311   assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute");
 312 
 313   const int bci = method->bci_from(bcp);
 314 
 315   // compute continuation length
 316   const int length = Bytecodes::length_at(method, bcp);
 317 
 318   // compute result type
 319   BasicType type = T_ILLEGAL;
 320 
 321   switch (code) {
 322     case Bytecodes::_invokevirtual  :
 323     case Bytecodes::_invokespecial  :
 324     case Bytecodes::_invokestatic   :
 325     case Bytecodes::_invokeinterface: {
 326       Thread *thread = Thread::current();
 327       ResourceMark rm(thread);
 328       methodHandle mh(thread, method);
 329       type = Bytecode_invoke(mh, bci).result_type();
 330       // since the cache entry might not be initialized:
 331       // (NOT needed for the old calling convension)
 332       if (!is_top_frame) {
 333         int index = Bytes::get_native_u2(bcp+1);
 334         method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
 335       }
 336       break;
 337     }
 338 
 339    case Bytecodes::_invokedynamic: {
 340       Thread *thread = Thread::current();
 341       ResourceMark rm(thread);
 342       methodHandle mh(thread, method);
 343       type = Bytecode_invoke(mh, bci).result_type();
 344       // since the cache entry might not be initialized:
 345       // (NOT needed for the old calling convension)
 346       if (!is_top_frame) {
 347         int index = Bytes::get_native_u4(bcp+1);
 348         method->constants()->invokedynamic_cp_cache_entry_at(index)->set_parameter_size(callee_parameters);
 349       }
 350       break;
 351     }
 352 
 353     case Bytecodes::_ldc   :
 354     case Bytecodes::_ldc_w : // fall through
 355     case Bytecodes::_ldc2_w:
 356       {
 357         Thread *thread = Thread::current();
 358         ResourceMark rm(thread);
 359         methodHandle mh(thread, method);
 360         type = Bytecode_loadconstant(mh, bci).result_type();
 361         break;
 362       }
 363 
 364     default:
 365       type = Bytecodes::result_type(code);
 366       break;
 367   }
 368 
 369   // return entry point for computed continuation state & bytecode length
 370   return
 371     is_top_frame
 372     ? Interpreter::deopt_entry (as_TosState(type), length)
 373     : Interpreter::return_entry(as_TosState(type), length, code);
 374 }
 375 
 376 // If deoptimization happens, this function returns the point where the interpreter reexecutes
 377 // the bytecode.
 378 // Note: Bytecodes::_athrow is a special case in that it does not return
 379 //       Interpreter::deopt_entry(vtos, 0) like others
 380 address AbstractInterpreter::deopt_reexecute_entry(Method* method, address bcp) {
 381   assert(method->contains(bcp), "just checkin'");
 382   Bytecodes::Code code   = Bytecodes::java_code_at(method, bcp);
 383 #if defined(COMPILER1) || INCLUDE_JVMCI
 384   if(code == Bytecodes::_athrow ) {
 385     return Interpreter::rethrow_exception_entry();
 386   }
 387 #endif /* COMPILER1 || INCLUDE_JVMCI */
 388   return Interpreter::deopt_entry(vtos, 0);
 389 }
 390 
 391 // If deoptimization happens, the interpreter should reexecute these bytecodes.
 392 // This function mainly helps the compilers to set up the reexecute bit.
 393 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
 394   switch (code) {
 395     case Bytecodes::_lookupswitch:
 396     case Bytecodes::_tableswitch:
 397     case Bytecodes::_fast_binaryswitch:
 398     case Bytecodes::_fast_linearswitch:
 399     // recompute condtional expression folded into _if<cond>
 400     case Bytecodes::_lcmp      :
 401     case Bytecodes::_fcmpl     :
 402     case Bytecodes::_fcmpg     :
 403     case Bytecodes::_dcmpl     :
 404     case Bytecodes::_dcmpg     :
 405     case Bytecodes::_ifnull    :
 406     case Bytecodes::_ifnonnull :
 407     case Bytecodes::_goto      :
 408     case Bytecodes::_goto_w    :
 409     case Bytecodes::_ifeq      :
 410     case Bytecodes::_ifne      :
 411     case Bytecodes::_iflt      :
 412     case Bytecodes::_ifge      :
 413     case Bytecodes::_ifgt      :
 414     case Bytecodes::_ifle      :
 415     case Bytecodes::_if_icmpeq :
 416     case Bytecodes::_if_icmpne :
 417     case Bytecodes::_if_icmplt :
 418     case Bytecodes::_if_icmpge :
 419     case Bytecodes::_if_icmpgt :
 420     case Bytecodes::_if_icmple :
 421     case Bytecodes::_if_acmpeq :
 422     case Bytecodes::_if_acmpne :
 423     // special cases
 424     case Bytecodes::_getfield  :
 425     case Bytecodes::_putfield  :
 426     case Bytecodes::_getstatic :
 427     case Bytecodes::_putstatic :
 428     case Bytecodes::_aastore   :
 429 #ifdef COMPILER1
 430     //special case of reexecution
 431     case Bytecodes::_athrow    :
 432 #endif
 433       return true;
 434 
 435     default:
 436       return false;
 437   }
 438 }
 439 
 440 void AbstractInterpreter::initialize_method_handle_entries() {
 441   // method handle entry kinds are generated later in MethodHandlesAdapterGenerator::generate:
 442   for (int i = method_handle_invoke_FIRST; i <= method_handle_invoke_LAST; i++) {
 443     MethodKind kind = (MethodKind) i;
 444     _entry_table[kind] = _entry_table[Interpreter::abstract];
 445     Interpreter::update_cds_entry_table(kind);
 446   }
 447 }
--- EOF ---