1 /*
   2  * Copyright (c) 2003, 2022, 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 "classfile/javaClasses.hpp"
  28 #include "compiler/compiler_globals.hpp"
  29 #include "compiler/disassembler.hpp"
  30 #include "gc/shared/barrierSetAssembler.hpp"
  31 #include "interpreter/bytecodeHistogram.hpp"
  32 #include "interpreter/interp_masm.hpp"
  33 #include "interpreter/interpreter.hpp"
  34 #include "interpreter/interpreterRuntime.hpp"
  35 #include "interpreter/templateInterpreterGenerator.hpp"
  36 #include "interpreter/templateTable.hpp"
  37 #include "oops/arrayOop.hpp"
  38 #include "oops/methodData.hpp"
  39 #include "oops/method.hpp"
  40 #include "oops/oop.inline.hpp"
  41 #include "oops/inlineKlass.hpp"
  42 #include "prims/jvmtiExport.hpp"
  43 #include "prims/jvmtiThreadState.hpp"
  44 #include "runtime/deoptimization.hpp"
  45 #include "runtime/frame.inline.hpp"
  46 #include "runtime/jniHandles.hpp"
  47 #include "runtime/sharedRuntime.hpp"
  48 #include "runtime/stubRoutines.hpp"
  49 #include "runtime/synchronizer.hpp"
  50 #include "runtime/timer.hpp"
  51 #include "runtime/vframeArray.hpp"
  52 #include "utilities/debug.hpp"
  53 #include "utilities/macros.hpp"
  54 
  55 #define __ Disassembler::hook<InterpreterMacroAssembler>(__FILE__, __LINE__, _masm)->
  56 
  57 // Size of interpreter code.  Increase if too small.  Interpreter will
  58 // fail with a guarantee ("not enough space for interpreter generation");
  59 // if too small.
  60 // Run with +PrintInterpreter to get the VM to print out the size.
  61 // Max size with JVMTI
  62 #ifdef AMD64
  63 int TemplateInterpreter::InterpreterCodeSize = JVMCI_ONLY(280) NOT_JVMCI(268) * 1024;
  64 #else
  65 int TemplateInterpreter::InterpreterCodeSize = 224 * 1024;
  66 #endif // AMD64
  67 
  68 // Global Register Names
  69 static const Register rbcp     = LP64_ONLY(r13) NOT_LP64(rsi);
  70 static const Register rlocals  = LP64_ONLY(r14) NOT_LP64(rdi);
  71 
  72 const int method_offset = frame::interpreter_frame_method_offset * wordSize;
  73 const int bcp_offset    = frame::interpreter_frame_bcp_offset    * wordSize;
  74 const int locals_offset = frame::interpreter_frame_locals_offset * wordSize;
  75 
  76 
  77 //-----------------------------------------------------------------------------
  78 
  79 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
  80   address entry = __ pc();
  81 
  82 #ifdef ASSERT
  83   {
  84     Label L;
  85     __ lea(rax, Address(rbp,
  86                         frame::interpreter_frame_monitor_block_top_offset *
  87                         wordSize));
  88     __ cmpptr(rax, rsp); // rax = maximal rsp for current rbp (stack
  89                          // grows negative)
  90     __ jcc(Assembler::aboveEqual, L); // check if frame is complete
  91     __ stop ("interpreter frame not set up");
  92     __ bind(L);
  93   }
  94 #endif // ASSERT
  95   // Restore bcp under the assumption that the current frame is still
  96   // interpreted
  97   __ restore_bcp();
  98 
  99   // expression stack must be empty before entering the VM if an
 100   // exception happened
 101   __ empty_expression_stack();
 102   // throw exception
 103   __ call_VM(noreg,
 104              CAST_FROM_FN_PTR(address,
 105                               InterpreterRuntime::throw_StackOverflowError));
 106   return entry;
 107 }
 108 
 109 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
 110   address entry = __ pc();
 111   // The expression stack must be empty before entering the VM if an
 112   // exception happened.
 113   __ empty_expression_stack();
 114 
 115   // Setup parameters.
 116   // ??? convention: expect aberrant index in register ebx/rbx.
 117   // Pass array to create more detailed exceptions.
 118   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
 119   __ call_VM(noreg,
 120              CAST_FROM_FN_PTR(address,
 121                               InterpreterRuntime::
 122                               throw_ArrayIndexOutOfBoundsException),
 123              rarg, rbx);
 124   return entry;
 125 }
 126 
 127 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
 128   address entry = __ pc();
 129 
 130   // object is at TOS
 131   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
 132   __ pop(rarg);
 133 
 134   // expression stack must be empty before entering the VM if an
 135   // exception happened
 136   __ empty_expression_stack();
 137 
 138   __ call_VM(noreg,
 139              CAST_FROM_FN_PTR(address,
 140                               InterpreterRuntime::
 141                               throw_ClassCastException),
 142              rarg);
 143   return entry;
 144 }
 145 
 146 address TemplateInterpreterGenerator::generate_exception_handler_common(
 147         const char* name, const char* message, bool pass_oop) {
 148   assert(!pass_oop || message == NULL, "either oop or message but not both");
 149   address entry = __ pc();
 150 
 151   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
 152   Register rarg2 = NOT_LP64(rbx) LP64_ONLY(c_rarg2);
 153 
 154   if (pass_oop) {
 155     // object is at TOS
 156     __ pop(rarg2);
 157   }
 158   // expression stack must be empty before entering the VM if an
 159   // exception happened
 160   __ empty_expression_stack();
 161   // setup parameters
 162   __ lea(rarg, ExternalAddress((address)name));
 163   if (pass_oop) {
 164     __ call_VM(rax, CAST_FROM_FN_PTR(address,
 165                                      InterpreterRuntime::
 166                                      create_klass_exception),
 167                rarg, rarg2);
 168   } else {
 169     __ lea(rarg2, ExternalAddress((address)message));
 170     __ call_VM(rax,
 171                CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
 172                rarg, rarg2);
 173   }
 174   // throw exception
 175   __ jump(ExternalAddress(Interpreter::throw_exception_entry()));
 176   return entry;
 177 }
 178 
 179 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
 180   address entry = __ pc();
 181 
 182 #ifndef _LP64
 183 #ifdef COMPILER2
 184   // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
 185   if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
 186     for (int i = 1; i < 8; i++) {
 187         __ ffree(i);
 188     }
 189   } else if (UseSSE < 2) {
 190     __ empty_FPU_stack();
 191   }
 192 #endif // COMPILER2
 193   if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
 194     __ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled");
 195   } else {
 196     __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");
 197   }
 198 
 199   if (state == ftos) {
 200     __ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_return_entry_for in interpreter");
 201   } else if (state == dtos) {
 202     __ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_return_entry_for in interpreter");
 203   }
 204 #endif // _LP64
 205 
 206   // Restore stack bottom in case i2c adjusted stack
 207   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
 208   // and NULL it as marker that esp is now tos until next java call
 209   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
 210 
 211   if (state == atos && InlineTypeReturnedAsFields) {
 212     __ store_inline_type_fields_to_buf(NULL);
 213   }
 214 
 215   __ restore_bcp();
 216   __ restore_locals();
 217 
 218   if (state == atos) {
 219     Register mdp = rbx;
 220     Register tmp = rcx;
 221     __ profile_return_type(mdp, rax, tmp);
 222   }
 223 
 224   const Register cache = rbx;
 225   const Register index = rcx;
 226   __ get_cache_and_index_at_bcp(cache, index, 1, index_size);
 227 
 228   const Register flags = cache;
 229   __ movl(flags, Address(cache, index, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()));
 230   __ andl(flags, ConstantPoolCacheEntry::parameter_size_mask);
 231   __ lea(rsp, Address(rsp, flags, Interpreter::stackElementScale()));
 232 
 233    const Register java_thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
 234    if (JvmtiExport::can_pop_frame()) {
 235      NOT_LP64(__ get_thread(java_thread));
 236      __ check_and_handle_popframe(java_thread);
 237    }
 238    if (JvmtiExport::can_force_early_return()) {
 239      NOT_LP64(__ get_thread(java_thread));
 240      __ check_and_handle_earlyret(java_thread);
 241    }
 242 
 243   __ dispatch_next(state, step);
 244 
 245   return entry;
 246 }
 247 
 248 
 249 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step, address continuation) {
 250   address entry = __ pc();
 251 
 252 #ifndef _LP64
 253   if (state == ftos) {
 254     __ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_deopt_entry_for in interpreter");
 255   } else if (state == dtos) {
 256     __ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_deopt_entry_for in interpreter");
 257   }
 258 #endif // _LP64
 259 
 260   // NULL last_sp until next java call
 261   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
 262   __ restore_bcp();
 263   __ restore_locals();
 264   const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
 265   NOT_LP64(__ get_thread(thread));
 266 #if INCLUDE_JVMCI
 267   // Check if we need to take lock at entry of synchronized method.  This can
 268   // only occur on method entry so emit it only for vtos with step 0.
 269   if (EnableJVMCI && state == vtos && step == 0) {
 270     Label L;
 271     __ cmpb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);
 272     __ jcc(Assembler::zero, L);
 273     // Clear flag.
 274     __ movb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);
 275     // Satisfy calling convention for lock_method().
 276     __ get_method(rbx);
 277     // Take lock.
 278     lock_method();
 279     __ bind(L);
 280   } else {
 281 #ifdef ASSERT
 282     if (EnableJVMCI) {
 283       Label L;
 284       __ cmpb(Address(r15_thread, JavaThread::pending_monitorenter_offset()), 0);
 285       __ jcc(Assembler::zero, L);
 286       __ stop("unexpected pending monitor in deopt entry");
 287       __ bind(L);
 288     }
 289 #endif
 290   }
 291 #endif
 292   // handle exceptions
 293   {
 294     Label L;
 295     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);
 296     __ jcc(Assembler::zero, L);
 297     __ call_VM(noreg,
 298                CAST_FROM_FN_PTR(address,
 299                                 InterpreterRuntime::throw_pending_exception));
 300     __ should_not_reach_here();
 301     __ bind(L);
 302   }
 303   if (continuation == NULL) {
 304     __ dispatch_next(state, step);
 305   } else {
 306     __ jump_to_entry(continuation);
 307   }
 308   return entry;
 309 }
 310 
 311 address TemplateInterpreterGenerator::generate_result_handler_for(
 312         BasicType type) {
 313   address entry = __ pc();
 314   switch (type) {
 315   case T_BOOLEAN: __ c2bool(rax);            break;
 316 #ifndef _LP64
 317   case T_CHAR   : __ andptr(rax, 0xFFFF);    break;
 318 #else
 319   case T_CHAR   : __ movzwl(rax, rax);       break;
 320 #endif // _LP64
 321   case T_BYTE   : __ sign_extend_byte(rax);  break;
 322   case T_SHORT  : __ sign_extend_short(rax); break;
 323   case T_INT    : /* nothing to do */        break;
 324   case T_LONG   : /* nothing to do */        break;
 325   case T_VOID   : /* nothing to do */        break;
 326 #ifndef _LP64
 327   case T_DOUBLE :
 328   case T_FLOAT  :
 329     { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
 330       __ pop(t);                            // remove return address first
 331       // Must return a result for interpreter or compiler. In SSE
 332       // mode, results are returned in xmm0 and the FPU stack must
 333       // be empty.
 334       if (type == T_FLOAT && UseSSE >= 1) {
 335         // Load ST0
 336         __ fld_d(Address(rsp, 0));
 337         // Store as float and empty fpu stack
 338         __ fstp_s(Address(rsp, 0));
 339         // and reload
 340         __ movflt(xmm0, Address(rsp, 0));
 341       } else if (type == T_DOUBLE && UseSSE >= 2 ) {
 342         __ movdbl(xmm0, Address(rsp, 0));
 343       } else {
 344         // restore ST0
 345         __ fld_d(Address(rsp, 0));
 346       }
 347       // and pop the temp
 348       __ addptr(rsp, 2 * wordSize);
 349       __ push(t);                           // restore return address
 350     }
 351     break;
 352 #else
 353   case T_FLOAT  : /* nothing to do */        break;
 354   case T_DOUBLE : /* nothing to do */        break;
 355 #endif // _LP64
 356 
 357   case T_PRIMITIVE_OBJECT: // fall through (inline types are handled with oops)
 358   case T_OBJECT :
 359     // retrieve result from frame
 360     __ movptr(rax, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize));
 361     // and verify it
 362     __ verify_oop(rax);
 363     break;
 364   default       : ShouldNotReachHere();
 365   }
 366   __ ret(0);                                   // return from result handler
 367   return entry;
 368 }
 369 
 370 address TemplateInterpreterGenerator::generate_safept_entry_for(
 371         TosState state,
 372         address runtime_entry) {
 373   address entry = __ pc();
 374   __ push(state);
 375   __ call_VM(noreg, runtime_entry);
 376   __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));
 377   return entry;
 378 }
 379 
 380 
 381 
 382 // Helpers for commoning out cases in the various type of method entries.
 383 //
 384 
 385 
 386 // increment invocation count & check for overflow
 387 //
 388 // Note: checking for negative value instead of overflow
 389 //       so we have a 'sticky' overflow test
 390 //
 391 // rbx: method
 392 // rcx: invocation counter
 393 //
 394 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
 395   Label done;
 396   // Note: In tiered we increment either counters in Method* or in MDO depending if we're profiling or not.
 397   Label no_mdo;
 398   if (ProfileInterpreter) {
 399     // Are we profiling?
 400     __ movptr(rax, Address(rbx, Method::method_data_offset()));
 401     __ testptr(rax, rax);
 402     __ jccb(Assembler::zero, no_mdo);
 403     // Increment counter in the MDO
 404     const Address mdo_invocation_counter(rax, in_bytes(MethodData::invocation_counter_offset()) +
 405         in_bytes(InvocationCounter::counter_offset()));
 406     const Address mask(rax, in_bytes(MethodData::invoke_mask_offset()));
 407     __ increment_mask_and_jump(mdo_invocation_counter, mask, rcx, overflow);
 408     __ jmp(done);
 409   }
 410   __ bind(no_mdo);
 411   // Increment counter in MethodCounters
 412   const Address invocation_counter(rax,
 413       MethodCounters::invocation_counter_offset() +
 414       InvocationCounter::counter_offset());
 415   __ get_method_counters(rbx, rax, done);
 416   const Address mask(rax, in_bytes(MethodCounters::invoke_mask_offset()));
 417   __ increment_mask_and_jump(invocation_counter, mask, rcx, overflow);
 418   __ bind(done);
 419 }
 420 
 421 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
 422 
 423   // Asm interpreter on entry
 424   // r14/rdi - locals
 425   // r13/rsi - bcp
 426   // rbx - method
 427   // rdx - cpool --- DOES NOT APPEAR TO BE TRUE
 428   // rbp - interpreter frame
 429 
 430   // On return (i.e. jump to entry_point) [ back to invocation of interpreter ]
 431   // Everything as it was on entry
 432   // rdx is not restored. Doesn't appear to really be set.
 433 
 434   // InterpreterRuntime::frequency_counter_overflow takes two
 435   // arguments, the first (thread) is passed by call_VM, the second
 436   // indicates if the counter overflow occurs at a backwards branch
 437   // (NULL bcp).  We pass zero for it.  The call returns the address
 438   // of the verified entry point for the method or NULL if the
 439   // compilation did not complete (either went background or bailed
 440   // out).
 441   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
 442   __ movl(rarg, 0);
 443   __ call_VM(noreg,
 444              CAST_FROM_FN_PTR(address,
 445                               InterpreterRuntime::frequency_counter_overflow),
 446              rarg);
 447 
 448   __ movptr(rbx, Address(rbp, method_offset));   // restore Method*
 449   // Preserve invariant that r13/r14 contain bcp/locals of sender frame
 450   // and jump to the interpreted entry.
 451   __ jmp(do_continue, relocInfo::none);
 452 }
 453 
 454 // See if we've got enough room on the stack for locals plus overhead below
 455 // JavaThread::stack_overflow_limit(). If not, throw a StackOverflowError
 456 // without going through the signal handler, i.e., reserved and yellow zones
 457 // will not be made usable. The shadow zone must suffice to handle the
 458 // overflow.
 459 // The expression stack grows down incrementally, so the normal guard
 460 // page mechanism will work for that.
 461 //
 462 // NOTE: Since the additional locals are also always pushed (wasn't
 463 // obvious in generate_fixed_frame) so the guard should work for them
 464 // too.
 465 //
 466 // Args:
 467 //      rdx: number of additional locals this frame needs (what we must check)
 468 //      rbx: Method*
 469 //
 470 // Kills:
 471 //      rax
 472 void TemplateInterpreterGenerator::generate_stack_overflow_check(void) {
 473 
 474   // monitor entry size: see picture of stack in frame_x86.hpp
 475   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
 476 
 477   // total overhead size: entry_size + (saved rbp through expr stack
 478   // bottom).  be sure to change this if you add/subtract anything
 479   // to/from the overhead area
 480   const int overhead_size =
 481     -(frame::interpreter_frame_initial_sp_offset * wordSize) + entry_size;
 482 
 483   const int page_size = os::vm_page_size();
 484 
 485   Label after_frame_check;
 486 
 487   // see if the frame is greater than one page in size. If so,
 488   // then we need to verify there is enough stack space remaining
 489   // for the additional locals.
 490   __ cmpl(rdx, (page_size - overhead_size) / Interpreter::stackElementSize);
 491   __ jcc(Assembler::belowEqual, after_frame_check);
 492 
 493   // compute rsp as if this were going to be the last frame on
 494   // the stack before the red zone
 495 
 496   Label after_frame_check_pop;
 497   const Register thread = NOT_LP64(rsi) LP64_ONLY(r15_thread);
 498 #ifndef _LP64
 499   __ push(thread);
 500   __ get_thread(thread);
 501 #endif
 502 
 503   const Address stack_limit(thread, JavaThread::stack_overflow_limit_offset());
 504 
 505   // locals + overhead, in bytes
 506   __ mov(rax, rdx);
 507   __ shlptr(rax, Interpreter::logStackElementSize); // Convert parameter count to bytes.
 508   __ addptr(rax, overhead_size);
 509 
 510 #ifdef ASSERT
 511   Label limit_okay;
 512   // Verify that thread stack overflow limit is non-zero.
 513   __ cmpptr(stack_limit, (int32_t)NULL_WORD);
 514   __ jcc(Assembler::notEqual, limit_okay);
 515   __ stop("stack overflow limit is zero");
 516   __ bind(limit_okay);
 517 #endif
 518 
 519   // Add locals/frame size to stack limit.
 520   __ addptr(rax, stack_limit);
 521 
 522   // Check against the current stack bottom.
 523   __ cmpptr(rsp, rax);
 524 
 525   __ jcc(Assembler::above, after_frame_check_pop);
 526   NOT_LP64(__ pop(rsi));  // get saved bcp
 527 
 528   // Restore sender's sp as SP. This is necessary if the sender's
 529   // frame is an extended compiled frame (see gen_c2i_adapter())
 530   // and safer anyway in case of JSR292 adaptations.
 531 
 532   __ pop(rax); // return address must be moved if SP is changed
 533   __ mov(rsp, rbcp);
 534   __ push(rax);
 535 
 536   // Note: the restored frame is not necessarily interpreted.
 537   // Use the shared runtime version of the StackOverflowError.
 538   assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
 539   __ jump(ExternalAddress(StubRoutines::throw_StackOverflowError_entry()));
 540   // all done with frame size check
 541   __ bind(after_frame_check_pop);
 542   NOT_LP64(__ pop(rsi));
 543 
 544   // all done with frame size check
 545   __ bind(after_frame_check);
 546 }
 547 
 548 // Allocate monitor and lock method (asm interpreter)
 549 //
 550 // Args:
 551 //      rbx: Method*
 552 //      r14/rdi: locals
 553 //
 554 // Kills:
 555 //      rax
 556 //      c_rarg0, c_rarg1, c_rarg2, c_rarg3, ...(param regs)
 557 //      rscratch1, rscratch2 (scratch regs)
 558 void TemplateInterpreterGenerator::lock_method() {
 559   // synchronize method
 560   const Address access_flags(rbx, Method::access_flags_offset());
 561   const Address monitor_block_top(
 562         rbp,
 563         frame::interpreter_frame_monitor_block_top_offset * wordSize);
 564   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
 565 
 566 #ifdef ASSERT
 567   {
 568     Label L;
 569     __ movl(rax, access_flags);
 570     __ testl(rax, JVM_ACC_SYNCHRONIZED);
 571     __ jcc(Assembler::notZero, L);
 572     __ stop("method doesn't need synchronization");
 573     __ bind(L);
 574   }
 575 #endif // ASSERT
 576 
 577   // get synchronization object
 578   {
 579     Label done;
 580     __ movl(rax, access_flags);
 581     __ testl(rax, JVM_ACC_STATIC);
 582     // get receiver (assume this is frequent case)
 583     __ movptr(rax, Address(rlocals, Interpreter::local_offset_in_bytes(0)));
 584     __ jcc(Assembler::zero, done);
 585     __ load_mirror(rax, rbx);
 586 
 587 #ifdef ASSERT
 588     {
 589       Label L;
 590       __ testptr(rax, rax);
 591       __ jcc(Assembler::notZero, L);
 592       __ stop("synchronization object is NULL");
 593       __ bind(L);
 594     }
 595 #endif // ASSERT
 596 
 597     __ bind(done);
 598   }
 599 
 600   // add space for monitor & lock
 601   __ subptr(rsp, entry_size); // add space for a monitor entry
 602   __ movptr(monitor_block_top, rsp);  // set new monitor block top
 603   // store object
 604   __ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax);
 605   const Register lockreg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
 606   __ movptr(lockreg, rsp); // object address
 607   __ lock_object(lockreg);
 608 }
 609 
 610 // Generate a fixed interpreter frame. This is identical setup for
 611 // interpreted methods and for native methods hence the shared code.
 612 //
 613 // Args:
 614 //      rax: return address
 615 //      rbx: Method*
 616 //      r14/rdi: pointer to locals
 617 //      r13/rsi: sender sp
 618 //      rdx: cp cache
 619 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
 620   // initialize fixed part of activation frame
 621   __ push(rax);        // save return address
 622   __ enter();          // save old & set new rbp
 623   __ push(rbcp);        // set sender sp
 624   __ push((int)NULL_WORD); // leave last_sp as null
 625   __ movptr(rbcp, Address(rbx, Method::const_offset()));      // get ConstMethod*
 626   __ lea(rbcp, Address(rbcp, ConstMethod::codes_offset())); // get codebase
 627   __ push(rbx);        // save Method*
 628   // Get mirror and store it in the frame as GC root for this Method*
 629   __ load_mirror(rdx, rbx);
 630   __ push(rdx);
 631   if (ProfileInterpreter) {
 632     Label method_data_continue;
 633     __ movptr(rdx, Address(rbx, in_bytes(Method::method_data_offset())));
 634     __ testptr(rdx, rdx);
 635     __ jcc(Assembler::zero, method_data_continue);
 636     __ addptr(rdx, in_bytes(MethodData::data_offset()));
 637     __ bind(method_data_continue);
 638     __ push(rdx);      // set the mdp (method data pointer)
 639   } else {
 640     __ push(0);
 641   }
 642 
 643   __ movptr(rdx, Address(rbx, Method::const_offset()));
 644   __ movptr(rdx, Address(rdx, ConstMethod::constants_offset()));
 645   __ movptr(rdx, Address(rdx, ConstantPool::cache_offset_in_bytes()));
 646   __ push(rdx); // set constant pool cache
 647   __ push(rlocals); // set locals pointer
 648   if (native_call) {
 649     __ push(0); // no bcp
 650   } else {
 651     __ push(rbcp); // set bcp
 652   }
 653   __ push(0); // reserve word for pointer to expression stack bottom
 654   __ movptr(Address(rsp, 0), rsp); // set expression stack bottom
 655 }
 656 
 657 // End of helpers
 658 
 659 // Method entry for java.lang.ref.Reference.get.
 660 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
 661   // Code: _aload_0, _getfield, _areturn
 662   // parameter size = 1
 663   //
 664   // The code that gets generated by this routine is split into 2 parts:
 665   //    1. The "intrinsified" code performing an ON_WEAK_OOP_REF load,
 666   //    2. The slow path - which is an expansion of the regular method entry.
 667   //
 668   // Notes:-
 669   // * An intrinsic is always executed, where an ON_WEAK_OOP_REF load is performed.
 670   // * We may jump to the slow path iff the receiver is null. If the
 671   //   Reference object is null then we no longer perform an ON_WEAK_OOP_REF load
 672   //   Thus we can use the regular method entry code to generate the NPE.
 673   //
 674   // rbx: Method*
 675 
 676   // r13: senderSP must preserve for slow path, set SP to it on fast path
 677 
 678   address entry = __ pc();
 679 
 680   const int referent_offset = java_lang_ref_Reference::referent_offset();
 681 
 682   Label slow_path;
 683   // rbx: method
 684 
 685   // Check if local 0 != NULL
 686   // If the receiver is null then it is OK to jump to the slow path.
 687   __ movptr(rax, Address(rsp, wordSize));
 688 
 689   __ testptr(rax, rax);
 690   __ jcc(Assembler::zero, slow_path);
 691 
 692   // rax: local 0
 693   // rbx: method (but can be used as scratch now)
 694   // rdx: scratch
 695   // rdi: scratch
 696 
 697   // Preserve the sender sp in case the load barrier
 698   // calls the runtime
 699   NOT_LP64(__ push(rsi));
 700 
 701   // Load the value of the referent field.
 702   const Address field_address(rax, referent_offset);
 703   __ load_heap_oop(rax, field_address, /*tmp1*/ rbx, /*tmp_thread*/ rdx, ON_WEAK_OOP_REF);
 704 
 705   // _areturn
 706   const Register sender_sp = NOT_LP64(rsi) LP64_ONLY(r13);
 707   NOT_LP64(__ pop(rsi));      // get sender sp
 708   __ pop(rdi);                // get return address
 709   __ mov(rsp, sender_sp);     // set sp to sender sp
 710   __ jmp(rdi);
 711   __ ret(0);
 712 
 713   // generate a vanilla interpreter entry as the slow path
 714   __ bind(slow_path);
 715   __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
 716   return entry;
 717 }
 718 
 719 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
 720   // See more discussion in stackOverflow.hpp.
 721 
 722   // Note that we do the banging after the frame is setup, since the exception
 723   // handling code expects to find a valid interpreter frame on the stack.
 724   // Doing the banging earlier fails if the caller frame is not an interpreter
 725   // frame.
 726   // (Also, the exception throwing code expects to unlock any synchronized
 727   // method receiver, so do the banging after locking the receiver.)
 728 
 729   const int shadow_zone_size = checked_cast<int>(StackOverflow::stack_shadow_zone_size());
 730   const int page_size = os::vm_page_size();
 731   const int n_shadow_pages = shadow_zone_size / page_size;
 732 
 733   const Register thread = NOT_LP64(rsi) LP64_ONLY(r15_thread);
 734 #ifndef _LP64
 735   __ push(thread);
 736   __ get_thread(thread);
 737 #endif
 738 
 739 #ifdef ASSERT
 740   Label L_good_limit;
 741   __ cmpptr(Address(thread, JavaThread::shadow_zone_safe_limit()), (int32_t)NULL_WORD);
 742   __ jcc(Assembler::notEqual, L_good_limit);
 743   __ stop("shadow zone safe limit is not initialized");
 744   __ bind(L_good_limit);
 745 
 746   Label L_good_watermark;
 747   __ cmpptr(Address(thread, JavaThread::shadow_zone_growth_watermark()), (int32_t)NULL_WORD);
 748   __ jcc(Assembler::notEqual, L_good_watermark);
 749   __ stop("shadow zone growth watermark is not initialized");
 750   __ bind(L_good_watermark);
 751 #endif
 752 
 753   Label L_done;
 754 
 755   __ cmpptr(rsp, Address(thread, JavaThread::shadow_zone_growth_watermark()));
 756   __ jcc(Assembler::above, L_done);
 757 
 758   for (int p = 1; p <= n_shadow_pages; p++) {
 759     __ bang_stack_with_offset(p*page_size);
 760   }
 761 
 762   // Record the new watermark, but only if update is above the safe limit.
 763   // Otherwise, the next time around the check above would pass the safe limit.
 764   __ cmpptr(rsp, Address(thread, JavaThread::shadow_zone_safe_limit()));
 765   __ jccb(Assembler::belowEqual, L_done);
 766   __ movptr(Address(thread, JavaThread::shadow_zone_growth_watermark()), rsp);
 767 
 768   __ bind(L_done);
 769 
 770 #ifndef _LP64
 771   __ pop(thread);
 772 #endif
 773 }
 774 
 775 // Interpreter stub for calling a native method. (asm interpreter)
 776 // This sets up a somewhat different looking stack for calling the
 777 // native method than the typical interpreter frame setup.
 778 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
 779   // determine code generation flags
 780   bool inc_counter  = UseCompiler || CountCompiledCalls || LogTouchedMethods;
 781 
 782   // rbx: Method*
 783   // rbcp: sender sp
 784 
 785   address entry_point = __ pc();
 786 
 787   const Address constMethod       (rbx, Method::const_offset());
 788   const Address access_flags      (rbx, Method::access_flags_offset());
 789   const Address size_of_parameters(rcx, ConstMethod::
 790                                         size_of_parameters_offset());
 791 
 792 
 793   // get parameter size (always needed)
 794   __ movptr(rcx, constMethod);
 795   __ load_unsigned_short(rcx, size_of_parameters);
 796 
 797   // native calls don't need the stack size check since they have no
 798   // expression stack and the arguments are already on the stack and
 799   // we only add a handful of words to the stack
 800 
 801   // rbx: Method*
 802   // rcx: size of parameters
 803   // rbcp: sender sp
 804   __ pop(rax);                                       // get return address
 805 
 806   // for natives the size of locals is zero
 807 
 808   // compute beginning of parameters
 809   __ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
 810 
 811   // add 2 zero-initialized slots for native calls
 812   // initialize result_handler slot
 813   __ push((int) NULL_WORD);
 814   // slot for oop temp
 815   // (static native method holder mirror/jni oop result)
 816   __ push((int) NULL_WORD);
 817 
 818   // initialize fixed part of activation frame
 819   generate_fixed_frame(true);
 820 
 821   // make sure method is native & not abstract
 822 #ifdef ASSERT
 823   __ movl(rax, access_flags);
 824   {
 825     Label L;
 826     __ testl(rax, JVM_ACC_NATIVE);
 827     __ jcc(Assembler::notZero, L);
 828     __ stop("tried to execute non-native method as native");
 829     __ bind(L);
 830   }
 831   {
 832     Label L;
 833     __ testl(rax, JVM_ACC_ABSTRACT);
 834     __ jcc(Assembler::zero, L);
 835     __ stop("tried to execute abstract method in interpreter");
 836     __ bind(L);
 837   }
 838 #endif
 839 
 840   // Since at this point in the method invocation the exception handler
 841   // would try to exit the monitor of synchronized methods which hasn't
 842   // been entered yet, we set the thread local variable
 843   // _do_not_unlock_if_synchronized to true. The remove_activation will
 844   // check this flag.
 845 
 846   const Register thread1 = NOT_LP64(rax) LP64_ONLY(r15_thread);
 847   NOT_LP64(__ get_thread(thread1));
 848   const Address do_not_unlock_if_synchronized(thread1,
 849         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
 850   __ movbool(do_not_unlock_if_synchronized, true);
 851 
 852   // increment invocation count & check for overflow
 853   Label invocation_counter_overflow;
 854   if (inc_counter) {
 855     generate_counter_incr(&invocation_counter_overflow);
 856   }
 857 
 858   Label continue_after_compile;
 859   __ bind(continue_after_compile);
 860 
 861   bang_stack_shadow_pages(true);
 862 
 863   // reset the _do_not_unlock_if_synchronized flag
 864   NOT_LP64(__ get_thread(thread1));
 865   __ movbool(do_not_unlock_if_synchronized, false);
 866 
 867   // check for synchronized methods
 868   // Must happen AFTER invocation_counter check and stack overflow check,
 869   // so method is not locked if overflows.
 870   if (synchronized) {
 871     lock_method();
 872   } else {
 873     // no synchronization necessary
 874 #ifdef ASSERT
 875     {
 876       Label L;
 877       __ movl(rax, access_flags);
 878       __ testl(rax, JVM_ACC_SYNCHRONIZED);
 879       __ jcc(Assembler::zero, L);
 880       __ stop("method needs synchronization");
 881       __ bind(L);
 882     }
 883 #endif
 884   }
 885 
 886   // start execution
 887 #ifdef ASSERT
 888   {
 889     Label L;
 890     const Address monitor_block_top(rbp,
 891                  frame::interpreter_frame_monitor_block_top_offset * wordSize);
 892     __ movptr(rax, monitor_block_top);
 893     __ cmpptr(rax, rsp);
 894     __ jcc(Assembler::equal, L);
 895     __ stop("broken stack frame setup in interpreter");
 896     __ bind(L);
 897   }
 898 #endif
 899 
 900   // jvmti support
 901   __ notify_method_entry();
 902 
 903   // work registers
 904   const Register method = rbx;
 905   const Register thread = NOT_LP64(rdi) LP64_ONLY(r15_thread);
 906   const Register t      = NOT_LP64(rcx) LP64_ONLY(r11);
 907 
 908   // allocate space for parameters
 909   __ get_method(method);
 910   __ movptr(t, Address(method, Method::const_offset()));
 911   __ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset()));
 912 
 913 #ifndef _LP64
 914   __ shlptr(t, Interpreter::logStackElementSize); // Convert parameter count to bytes.
 915   __ addptr(t, 2*wordSize);     // allocate two more slots for JNIEnv and possible mirror
 916   __ subptr(rsp, t);
 917   __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics
 918 #else
 919   __ shll(t, Interpreter::logStackElementSize);
 920 
 921   __ subptr(rsp, t);
 922   __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
 923   __ andptr(rsp, -16); // must be 16 byte boundary (see amd64 ABI)
 924 #endif // _LP64
 925 
 926   // get signature handler
 927   {
 928     Label L;
 929     __ movptr(t, Address(method, Method::signature_handler_offset()));
 930     __ testptr(t, t);
 931     __ jcc(Assembler::notZero, L);
 932     __ call_VM(noreg,
 933                CAST_FROM_FN_PTR(address,
 934                                 InterpreterRuntime::prepare_native_call),
 935                method);
 936     __ get_method(method);
 937     __ movptr(t, Address(method, Method::signature_handler_offset()));
 938     __ bind(L);
 939   }
 940 
 941   // call signature handler
 942   assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rlocals,
 943          "adjust this code");
 944   assert(InterpreterRuntime::SignatureHandlerGenerator::to() == rsp,
 945          "adjust this code");
 946   assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == NOT_LP64(t) LP64_ONLY(rscratch1),
 947          "adjust this code");
 948 
 949   // The generated handlers do not touch RBX (the method).
 950   // However, large signatures cannot be cached and are generated
 951   // each time here.  The slow-path generator can do a GC on return,
 952   // so we must reload it after the call.
 953   __ call(t);
 954   __ get_method(method);        // slow path can do a GC, reload RBX
 955 
 956 
 957   // result handler is in rax
 958   // set result handler
 959   __ movptr(Address(rbp,
 960                     (frame::interpreter_frame_result_handler_offset) * wordSize),
 961             rax);
 962 
 963   // pass mirror handle if static call
 964   {
 965     Label L;
 966     __ movl(t, Address(method, Method::access_flags_offset()));
 967     __ testl(t, JVM_ACC_STATIC);
 968     __ jcc(Assembler::zero, L);
 969     // get mirror
 970     __ load_mirror(t, method, rax);
 971     // copy mirror into activation frame
 972     __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize),
 973             t);
 974     // pass handle to mirror
 975 #ifndef _LP64
 976     __ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
 977     __ movptr(Address(rsp, wordSize), t);
 978 #else
 979     __ lea(c_rarg1,
 980            Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
 981 #endif // _LP64
 982     __ bind(L);
 983   }
 984 
 985   // get native function entry point
 986   {
 987     Label L;
 988     __ movptr(rax, Address(method, Method::native_function_offset()));
 989     ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
 990     __ cmpptr(rax, unsatisfied.addr());
 991     __ jcc(Assembler::notEqual, L);
 992     __ call_VM(noreg,
 993                CAST_FROM_FN_PTR(address,
 994                                 InterpreterRuntime::prepare_native_call),
 995                method);
 996     __ get_method(method);
 997     __ movptr(rax, Address(method, Method::native_function_offset()));
 998     __ bind(L);
 999   }
1000 
1001   // pass JNIEnv
1002 #ifndef _LP64
1003    __ get_thread(thread);
1004    __ lea(t, Address(thread, JavaThread::jni_environment_offset()));
1005    __ movptr(Address(rsp, 0), t);
1006 
1007    // set_last_Java_frame_before_call
1008    // It is enough that the pc()
1009    // points into the right code segment. It does not have to be the correct return pc.
1010    __ set_last_Java_frame(thread, noreg, rbp, __ pc());
1011 #else
1012    __ lea(c_rarg0, Address(r15_thread, JavaThread::jni_environment_offset()));
1013 
1014    // It is enough that the pc() points into the right code
1015    // segment. It does not have to be the correct return pc.
1016    __ set_last_Java_frame(rsp, rbp, (address) __ pc());
1017 #endif // _LP64
1018 
1019   // change thread state
1020 #ifdef ASSERT
1021   {
1022     Label L;
1023     __ movl(t, Address(thread, JavaThread::thread_state_offset()));
1024     __ cmpl(t, _thread_in_Java);
1025     __ jcc(Assembler::equal, L);
1026     __ stop("Wrong thread state in native stub");
1027     __ bind(L);
1028   }
1029 #endif
1030 
1031   // Change state to native
1032 
1033   __ movl(Address(thread, JavaThread::thread_state_offset()),
1034           _thread_in_native);
1035 
1036   // Call the native method.
1037   __ call(rax);
1038   // 32: result potentially in rdx:rax or ST0
1039   // 64: result potentially in rax or xmm0
1040 
1041   // Verify or restore cpu control state after JNI call
1042   __ restore_cpu_control_state_after_jni();
1043 
1044   // NOTE: The order of these pushes is known to frame::interpreter_frame_result
1045   // in order to extract the result of a method call. If the order of these
1046   // pushes change or anything else is added to the stack then the code in
1047   // interpreter_frame_result must also change.
1048 
1049 #ifndef _LP64
1050   // save potential result in ST(0) & rdx:rax
1051   // (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 -
1052   // the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers)
1053   // It is safe to do this push because state is _thread_in_native and return address will be found
1054   // via _last_native_pc and not via _last_jave_sp
1055 
1056   // NOTE: the order of theses push(es) is known to frame::interpreter_frame_result.
1057   // If the order changes or anything else is added to the stack the code in
1058   // interpreter_frame_result will have to be changed.
1059 
1060   { Label L;
1061     Label push_double;
1062     ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));
1063     ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));
1064     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
1065               float_handler.addr());
1066     __ jcc(Assembler::equal, push_double);
1067     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
1068               double_handler.addr());
1069     __ jcc(Assembler::notEqual, L);
1070     __ bind(push_double);
1071     __ push_d(); // FP values are returned using the FPU, so push FPU contents (even if UseSSE > 0).
1072     __ bind(L);
1073   }
1074 #else
1075   __ push(dtos);
1076 #endif // _LP64
1077 
1078   __ push(ltos);
1079 
1080   // change thread state
1081   NOT_LP64(__ get_thread(thread));
1082   __ movl(Address(thread, JavaThread::thread_state_offset()),
1083           _thread_in_native_trans);
1084 
1085   // Force this write out before the read below
1086   __ membar(Assembler::Membar_mask_bits(
1087               Assembler::LoadLoad | Assembler::LoadStore |
1088               Assembler::StoreLoad | Assembler::StoreStore));
1089 
1090 #ifndef _LP64
1091   if (AlwaysRestoreFPU) {
1092     //  Make sure the control word is correct.
1093     __ fldcw(ExternalAddress(StubRoutines::x86::addr_fpu_cntrl_wrd_std()));
1094   }
1095 #endif // _LP64
1096 
1097   // check for safepoint operation in progress and/or pending suspend requests
1098   {
1099     Label Continue;
1100     Label slow_path;
1101 
1102     __ safepoint_poll(slow_path, thread, true /* at_return */, false /* in_nmethod */);
1103 
1104     __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);
1105     __ jcc(Assembler::equal, Continue);
1106     __ bind(slow_path);
1107 
1108     // Don't use call_VM as it will see a possible pending exception
1109     // and forward it and never return here preventing us from
1110     // clearing _last_native_pc down below.  Also can't use
1111     // call_VM_leaf either as it will check to see if r13 & r14 are
1112     // preserved and correspond to the bcp/locals pointers. So we do a
1113     // runtime call by hand.
1114     //
1115 #ifndef _LP64
1116     __ push(thread);
1117     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address,
1118                                             JavaThread::check_special_condition_for_native_trans)));
1119     __ increment(rsp, wordSize);
1120     __ get_thread(thread);
1121 #else
1122     __ mov(c_rarg0, r15_thread);
1123     __ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
1124     __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
1125     __ andptr(rsp, -16); // align stack as required by ABI
1126     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
1127     __ mov(rsp, r12); // restore sp
1128     __ reinit_heapbase();
1129 #endif // _LP64
1130     __ bind(Continue);
1131   }
1132 
1133   // change thread state
1134   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java);
1135 
1136   // reset_last_Java_frame
1137   __ reset_last_Java_frame(thread, true);
1138 
1139   if (CheckJNICalls) {
1140     // clear_pending_jni_exception_check
1141     __ movptr(Address(thread, JavaThread::pending_jni_exception_check_fn_offset()), NULL_WORD);
1142   }
1143 
1144   // reset handle block
1145   __ movptr(t, Address(thread, JavaThread::active_handles_offset()));
1146   __ movl(Address(t, JNIHandleBlock::top_offset_in_bytes()), (int32_t)NULL_WORD);
1147 
1148   // If result is an oop unbox and store it in frame where gc will see it
1149   // and result handler will pick it up
1150 
1151   {
1152     Label no_oop;
1153     __ lea(t, ExternalAddress(AbstractInterpreter::result_handler(T_OBJECT)));
1154     __ cmpptr(t, Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize));
1155     __ jcc(Assembler::notEqual, no_oop);
1156     // retrieve result
1157     __ pop(ltos);
1158     // Unbox oop result, e.g. JNIHandles::resolve value.
1159     __ resolve_jobject(rax /* value */,
1160                        thread /* thread */,
1161                        t /* tmp */);
1162     __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize), rax);
1163     // keep stack depth as expected by pushing oop which will eventually be discarded
1164     __ push(ltos);
1165     __ bind(no_oop);
1166   }
1167 
1168 
1169   {
1170     Label no_reguard;
1171     __ cmpl(Address(thread, JavaThread::stack_guard_state_offset()),
1172             StackOverflow::stack_guard_yellow_reserved_disabled);
1173     __ jcc(Assembler::notEqual, no_reguard);
1174 
1175     __ pusha(); // XXX only save smashed registers
1176 #ifndef _LP64
1177     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
1178     __ popa();
1179 #else
1180     __ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
1181     __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
1182     __ andptr(rsp, -16); // align stack as required by ABI
1183     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
1184     __ mov(rsp, r12); // restore sp
1185     __ popa(); // XXX only restore smashed registers
1186     __ reinit_heapbase();
1187 #endif // _LP64
1188 
1189     __ bind(no_reguard);
1190   }
1191 
1192 
1193   // The method register is junk from after the thread_in_native transition
1194   // until here.  Also can't call_VM until the bcp has been
1195   // restored.  Need bcp for throwing exception below so get it now.
1196   __ get_method(method);
1197 
1198   // restore to have legal interpreter frame, i.e., bci == 0 <=> code_base()
1199   __ movptr(rbcp, Address(method, Method::const_offset()));   // get ConstMethod*
1200   __ lea(rbcp, Address(rbcp, ConstMethod::codes_offset()));    // get codebase
1201 
1202   // handle exceptions (exception handling will handle unlocking!)
1203   {
1204     Label L;
1205     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);
1206     __ jcc(Assembler::zero, L);
1207     // Note: At some point we may want to unify this with the code
1208     // used in call_VM_base(); i.e., we should use the
1209     // StubRoutines::forward_exception code. For now this doesn't work
1210     // here because the rsp is not correctly set at this point.
1211     __ MacroAssembler::call_VM(noreg,
1212                                CAST_FROM_FN_PTR(address,
1213                                InterpreterRuntime::throw_pending_exception));
1214     __ should_not_reach_here();
1215     __ bind(L);
1216   }
1217 
1218   // do unlocking if necessary
1219   {
1220     Label L;
1221     __ movl(t, Address(method, Method::access_flags_offset()));
1222     __ testl(t, JVM_ACC_SYNCHRONIZED);
1223     __ jcc(Assembler::zero, L);
1224     // the code below should be shared with interpreter macro
1225     // assembler implementation
1226     {
1227       Label unlock;
1228       // BasicObjectLock will be first in list, since this is a
1229       // synchronized method. However, need to check that the object
1230       // has not been unlocked by an explicit monitorexit bytecode.
1231       const Address monitor(rbp,
1232                             (intptr_t)(frame::interpreter_frame_initial_sp_offset *
1233                                        wordSize - (int)sizeof(BasicObjectLock)));
1234 
1235       const Register regmon = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
1236 
1237       // monitor expect in c_rarg1 for slow unlock path
1238       __ lea(regmon, monitor); // address of first monitor
1239 
1240       __ movptr(t, Address(regmon, BasicObjectLock::obj_offset_in_bytes()));
1241       __ testptr(t, t);
1242       __ jcc(Assembler::notZero, unlock);
1243 
1244       // Entry already unlocked, need to throw exception
1245       __ MacroAssembler::call_VM(noreg,
1246                                  CAST_FROM_FN_PTR(address,
1247                    InterpreterRuntime::throw_illegal_monitor_state_exception));
1248       __ should_not_reach_here();
1249 
1250       __ bind(unlock);
1251       __ unlock_object(regmon);
1252     }
1253     __ bind(L);
1254   }
1255 
1256   // jvmti support
1257   // Note: This must happen _after_ handling/throwing any exceptions since
1258   //       the exception handler code notifies the runtime of method exits
1259   //       too. If this happens before, method entry/exit notifications are
1260   //       not properly paired (was bug - gri 11/22/99).
1261   __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI);
1262 
1263   // restore potential result in edx:eax, call result handler to
1264   // restore potential result in ST0 & handle result
1265 
1266   __ pop(ltos);
1267   LP64_ONLY( __ pop(dtos));
1268 
1269   __ movptr(t, Address(rbp,
1270                        (frame::interpreter_frame_result_handler_offset) * wordSize));
1271   __ call(t);
1272 
1273   // remove activation
1274   __ movptr(t, Address(rbp,
1275                        frame::interpreter_frame_sender_sp_offset *
1276                        wordSize)); // get sender sp
1277   __ leave();                                // remove frame anchor
1278   __ pop(rdi);                               // get return address
1279   __ mov(rsp, t);                            // set sp to sender sp
1280   __ jmp(rdi);
1281 
1282   if (inc_counter) {
1283     // Handle overflow of counter and compile method
1284     __ bind(invocation_counter_overflow);
1285     generate_counter_overflow(continue_after_compile);
1286   }
1287 
1288   return entry_point;
1289 }
1290 
1291 // Abstract method entry
1292 // Attempt to execute abstract method. Throw exception
1293 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
1294 
1295   address entry_point = __ pc();
1296 
1297   // abstract method entry
1298 
1299   //  pop return address, reset last_sp to NULL
1300   __ empty_expression_stack();
1301   __ restore_bcp();      // rsi must be correct for exception handler   (was destroyed)
1302   __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)
1303 
1304   // throw exception
1305   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodErrorWithMethod), rbx);
1306   // the call_VM checks for exception, so we should never return here.
1307   __ should_not_reach_here();
1308 
1309   return entry_point;
1310 }
1311 
1312 //
1313 // Generic interpreted method entry to (asm) interpreter
1314 //
1315 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1316   // determine code generation flags
1317   bool inc_counter  = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1318 
1319   // ebx: Method*
1320   // rbcp: sender sp
1321   address entry_point = __ pc();
1322 
1323   const Address constMethod(rbx, Method::const_offset());
1324   const Address access_flags(rbx, Method::access_flags_offset());
1325   const Address size_of_parameters(rdx,
1326                                    ConstMethod::size_of_parameters_offset());
1327   const Address size_of_locals(rdx, ConstMethod::size_of_locals_offset());
1328 
1329 
1330   // get parameter size (always needed)
1331   __ movptr(rdx, constMethod);
1332   __ load_unsigned_short(rcx, size_of_parameters);
1333 
1334   // rbx: Method*
1335   // rcx: size of parameters
1336   // rbcp: sender_sp (could differ from sp+wordSize if we were called via c2i )
1337 
1338   __ load_unsigned_short(rdx, size_of_locals); // get size of locals in words
1339   __ subl(rdx, rcx); // rdx = no. of additional locals
1340 
1341   // YYY
1342 //   __ incrementl(rdx);
1343 //   __ andl(rdx, -2);
1344 
1345   // see if we've got enough room on the stack for locals plus overhead.
1346   generate_stack_overflow_check();
1347 
1348   // get return address
1349   __ pop(rax);
1350 
1351   // compute beginning of parameters
1352   __ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
1353 
1354   // rdx - # of additional locals
1355   // allocate space for locals
1356   // explicitly initialize locals
1357   {
1358     Label exit, loop;
1359     __ testl(rdx, rdx);
1360     __ jcc(Assembler::lessEqual, exit); // do nothing if rdx <= 0
1361     __ bind(loop);
1362     __ push((int) NULL_WORD); // initialize local variables
1363     __ decrementl(rdx); // until everything initialized
1364     __ jcc(Assembler::greater, loop);
1365     __ bind(exit);
1366   }
1367 
1368   // initialize fixed part of activation frame
1369   generate_fixed_frame(false);
1370 
1371   // make sure method is not native & not abstract
1372 #ifdef ASSERT
1373   __ movl(rax, access_flags);
1374   {
1375     Label L;
1376     __ testl(rax, JVM_ACC_NATIVE);
1377     __ jcc(Assembler::zero, L);
1378     __ stop("tried to execute native method as non-native");
1379     __ bind(L);
1380   }
1381   {
1382     Label L;
1383     __ testl(rax, JVM_ACC_ABSTRACT);
1384     __ jcc(Assembler::zero, L);
1385     __ stop("tried to execute abstract method in interpreter");
1386     __ bind(L);
1387   }
1388 #endif
1389 
1390   // Since at this point in the method invocation the exception
1391   // handler would try to exit the monitor of synchronized methods
1392   // which hasn't been entered yet, we set the thread local variable
1393   // _do_not_unlock_if_synchronized to true. The remove_activation
1394   // will check this flag.
1395 
1396   const Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread);
1397   NOT_LP64(__ get_thread(thread));
1398   const Address do_not_unlock_if_synchronized(thread,
1399         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
1400   __ movbool(do_not_unlock_if_synchronized, true);
1401 
1402   __ profile_parameters_type(rax, rcx, rdx);
1403   // increment invocation count & check for overflow
1404   Label invocation_counter_overflow;
1405   if (inc_counter) {
1406     generate_counter_incr(&invocation_counter_overflow);
1407   }
1408 
1409   Label continue_after_compile;
1410   __ bind(continue_after_compile);
1411 
1412   // check for synchronized interpreted methods
1413   bang_stack_shadow_pages(false);
1414 
1415   // reset the _do_not_unlock_if_synchronized flag
1416   NOT_LP64(__ get_thread(thread));
1417   __ movbool(do_not_unlock_if_synchronized, false);
1418 
1419   // check for synchronized methods
1420   // Must happen AFTER invocation_counter check and stack overflow check,
1421   // so method is not locked if overflows.
1422   if (synchronized) {
1423     // Allocate monitor and lock method
1424     lock_method();
1425   } else {
1426     // no synchronization necessary
1427 #ifdef ASSERT
1428     {
1429       Label L;
1430       __ movl(rax, access_flags);
1431       __ testl(rax, JVM_ACC_SYNCHRONIZED);
1432       __ jcc(Assembler::zero, L);
1433       __ stop("method needs synchronization");
1434       __ bind(L);
1435     }
1436 #endif
1437   }
1438 
1439   // start execution
1440 #ifdef ASSERT
1441   {
1442     Label L;
1443      const Address monitor_block_top (rbp,
1444                  frame::interpreter_frame_monitor_block_top_offset * wordSize);
1445     __ movptr(rax, monitor_block_top);
1446     __ cmpptr(rax, rsp);
1447     __ jcc(Assembler::equal, L);
1448     __ stop("broken stack frame setup in interpreter");
1449     __ bind(L);
1450   }
1451 #endif
1452 
1453   // jvmti support
1454   __ notify_method_entry();
1455 
1456   __ dispatch_next(vtos);
1457 
1458   // invocation counter overflow
1459   if (inc_counter) {
1460     // Handle overflow of counter and compile method
1461     __ bind(invocation_counter_overflow);
1462     generate_counter_overflow(continue_after_compile);
1463   }
1464 
1465   return entry_point;
1466 }
1467 
1468 //-----------------------------------------------------------------------------
1469 // Exceptions
1470 
1471 void TemplateInterpreterGenerator::generate_throw_exception() {
1472   // Entry point in previous activation (i.e., if the caller was
1473   // interpreted)
1474   Interpreter::_rethrow_exception_entry = __ pc();
1475   // Restore sp to interpreter_frame_last_sp even though we are going
1476   // to empty the expression stack for the exception processing.
1477   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
1478   // rax: exception
1479   // rdx: return address/pc that threw exception
1480   __ restore_bcp();    // r13/rsi points to call/send
1481   __ restore_locals();
1482   LP64_ONLY(__ reinit_heapbase());  // restore r12 as heapbase.
1483   // Entry point for exceptions thrown within interpreter code
1484   Interpreter::_throw_exception_entry = __ pc();
1485   // expression stack is undefined here
1486   // rax: exception
1487   // r13/rsi: exception bcp
1488   __ verify_oop(rax);
1489   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
1490   LP64_ONLY(__ mov(c_rarg1, rax));
1491 
1492   // expression stack must be empty before entering the VM in case of
1493   // an exception
1494   __ empty_expression_stack();
1495   // find exception handler address and preserve exception oop
1496   __ call_VM(rdx,
1497              CAST_FROM_FN_PTR(address,
1498                           InterpreterRuntime::exception_handler_for_exception),
1499              rarg);
1500   // rax: exception handler entry point
1501   // rdx: preserved exception oop
1502   // r13/rsi: bcp for exception handler
1503   __ push_ptr(rdx); // push exception which is now the only value on the stack
1504   __ jmp(rax); // jump to exception handler (may be _remove_activation_entry!)
1505 
1506   // If the exception is not handled in the current frame the frame is
1507   // removed and the exception is rethrown (i.e. exception
1508   // continuation is _rethrow_exception).
1509   //
1510   // Note: At this point the bci is still the bxi for the instruction
1511   // which caused the exception and the expression stack is
1512   // empty. Thus, for any VM calls at this point, GC will find a legal
1513   // oop map (with empty expression stack).
1514 
1515   // In current activation
1516   // tos: exception
1517   // esi: exception bcp
1518 
1519   //
1520   // JVMTI PopFrame support
1521   //
1522 
1523   Interpreter::_remove_activation_preserving_args_entry = __ pc();
1524   __ empty_expression_stack();
1525   // Set the popframe_processing bit in pending_popframe_condition
1526   // indicating that we are currently handling popframe, so that
1527   // call_VMs that may happen later do not trigger new popframe
1528   // handling cycles.
1529   const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
1530   NOT_LP64(__ get_thread(thread));
1531   __ movl(rdx, Address(thread, JavaThread::popframe_condition_offset()));
1532   __ orl(rdx, JavaThread::popframe_processing_bit);
1533   __ movl(Address(thread, JavaThread::popframe_condition_offset()), rdx);
1534 
1535   {
1536     // Check to see whether we are returning to a deoptimized frame.
1537     // (The PopFrame call ensures that the caller of the popped frame is
1538     // either interpreted or compiled and deoptimizes it if compiled.)
1539     // In this case, we can't call dispatch_next() after the frame is
1540     // popped, but instead must save the incoming arguments and restore
1541     // them after deoptimization has occurred.
1542     //
1543     // Note that we don't compare the return PC against the
1544     // deoptimization blob's unpack entry because of the presence of
1545     // adapter frames in C2.
1546     Label caller_not_deoptimized;
1547     Register rarg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
1548     __ movptr(rarg, Address(rbp, frame::return_addr_offset * wordSize));
1549     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
1550                                InterpreterRuntime::interpreter_contains), rarg);
1551     __ testl(rax, rax);
1552     __ jcc(Assembler::notZero, caller_not_deoptimized);
1553 
1554     // Compute size of arguments for saving when returning to
1555     // deoptimized caller
1556     __ get_method(rax);
1557     __ movptr(rax, Address(rax, Method::const_offset()));
1558     __ load_unsigned_short(rax, Address(rax, in_bytes(ConstMethod::
1559                                                 size_of_parameters_offset())));
1560     __ shll(rax, Interpreter::logStackElementSize);
1561     __ restore_locals();
1562     __ subptr(rlocals, rax);
1563     __ addptr(rlocals, wordSize);
1564     // Save these arguments
1565     NOT_LP64(__ get_thread(thread));
1566     __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
1567                                            Deoptimization::
1568                                            popframe_preserve_args),
1569                           thread, rax, rlocals);
1570 
1571     __ remove_activation(vtos, rdx,
1572                          /* throw_monitor_exception */ false,
1573                          /* install_monitor_exception */ false,
1574                          /* notify_jvmdi */ false);
1575 
1576     // Inform deoptimization that it is responsible for restoring
1577     // these arguments
1578     NOT_LP64(__ get_thread(thread));
1579     __ movl(Address(thread, JavaThread::popframe_condition_offset()),
1580             JavaThread::popframe_force_deopt_reexecution_bit);
1581 
1582     // Continue in deoptimization handler
1583     __ jmp(rdx);
1584 
1585     __ bind(caller_not_deoptimized);
1586   }
1587 
1588   __ remove_activation(vtos, rdx, /* rdx result (retaddr) is not used */
1589                        /* throw_monitor_exception */ false,
1590                        /* install_monitor_exception */ false,
1591                        /* notify_jvmdi */ false);
1592 
1593   // Finish with popframe handling
1594   // A previous I2C followed by a deoptimization might have moved the
1595   // outgoing arguments further up the stack. PopFrame expects the
1596   // mutations to those outgoing arguments to be preserved and other
1597   // constraints basically require this frame to look exactly as
1598   // though it had previously invoked an interpreted activation with
1599   // no space between the top of the expression stack (current
1600   // last_sp) and the top of stack. Rather than force deopt to
1601   // maintain this kind of invariant all the time we call a small
1602   // fixup routine to move the mutated arguments onto the top of our
1603   // expression stack if necessary.
1604 #ifndef _LP64
1605   __ mov(rax, rsp);
1606   __ movptr(rbx, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
1607   __ get_thread(thread);
1608   // PC must point into interpreter here
1609   __ set_last_Java_frame(thread, noreg, rbp, __ pc());
1610   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), thread, rax, rbx);
1611   __ get_thread(thread);
1612 #else
1613   __ mov(c_rarg1, rsp);
1614   __ movptr(c_rarg2, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
1615   // PC must point into interpreter here
1616   __ set_last_Java_frame(noreg, rbp, __ pc());
1617   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), r15_thread, c_rarg1, c_rarg2);
1618 #endif
1619   __ reset_last_Java_frame(thread, true);
1620 
1621   // Restore the last_sp and null it out
1622   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
1623   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
1624 
1625   __ restore_bcp();
1626   __ restore_locals();
1627   // The method data pointer was incremented already during
1628   // call profiling. We have to restore the mdp for the current bcp.
1629   if (ProfileInterpreter) {
1630     __ set_method_data_pointer_for_bcp();
1631   }
1632 
1633   // Clear the popframe condition flag
1634   NOT_LP64(__ get_thread(thread));
1635   __ movl(Address(thread, JavaThread::popframe_condition_offset()),
1636           JavaThread::popframe_inactive);
1637 
1638 #if INCLUDE_JVMTI
1639   {
1640     Label L_done;
1641     const Register local0 = rlocals;
1642 
1643     __ cmpb(Address(rbcp, 0), Bytecodes::_invokestatic);
1644     __ jcc(Assembler::notEqual, L_done);
1645 
1646     // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
1647     // Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL.
1648 
1649     __ get_method(rdx);
1650     __ movptr(rax, Address(local0, 0));
1651     __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), rax, rdx, rbcp);
1652 
1653     __ testptr(rax, rax);
1654     __ jcc(Assembler::zero, L_done);
1655 
1656     __ movptr(Address(rbx, 0), rax);
1657     __ bind(L_done);
1658   }
1659 #endif // INCLUDE_JVMTI
1660 
1661   __ dispatch_next(vtos);
1662   // end of PopFrame support
1663 
1664   Interpreter::_remove_activation_entry = __ pc();
1665 
1666   // preserve exception over this code sequence
1667   __ pop_ptr(rax);
1668   NOT_LP64(__ get_thread(thread));
1669   __ movptr(Address(thread, JavaThread::vm_result_offset()), rax);
1670   // remove the activation (without doing throws on illegalMonitorExceptions)
1671   __ remove_activation(vtos, rdx, false, true, false);
1672   // restore exception
1673   NOT_LP64(__ get_thread(thread));
1674   __ get_vm_result(rax, thread);
1675 
1676   // In between activations - previous activation type unknown yet
1677   // compute continuation point - the continuation point expects the
1678   // following registers set up:
1679   //
1680   // rax: exception
1681   // rdx: return address/pc that threw exception
1682   // rsp: expression stack of caller
1683   // rbp: ebp of caller
1684   __ push(rax);                                  // save exception
1685   __ push(rdx);                                  // save return address
1686   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
1687                           SharedRuntime::exception_handler_for_return_address),
1688                         thread, rdx);
1689   __ mov(rbx, rax);                              // save exception handler
1690   __ pop(rdx);                                   // restore return address
1691   __ pop(rax);                                   // restore exception
1692   // Note that an "issuing PC" is actually the next PC after the call
1693   __ jmp(rbx);                                   // jump to exception
1694                                                  // handler of caller
1695 }
1696 
1697 
1698 //
1699 // JVMTI ForceEarlyReturn support
1700 //
1701 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
1702   address entry = __ pc();
1703 
1704   __ restore_bcp();
1705   __ restore_locals();
1706   __ empty_expression_stack();
1707   __ load_earlyret_value(state);  // 32 bits returns value in rdx, so don't reuse
1708 
1709   const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
1710   NOT_LP64(__ get_thread(thread));
1711   __ movptr(rcx, Address(thread, JavaThread::jvmti_thread_state_offset()));
1712   Address cond_addr(rcx, JvmtiThreadState::earlyret_state_offset());
1713 
1714   // Clear the earlyret state
1715   __ movl(cond_addr, JvmtiThreadState::earlyret_inactive);
1716 
1717   __ remove_activation(state, rsi,
1718                        false, /* throw_monitor_exception */
1719                        false, /* install_monitor_exception */
1720                        true); /* notify_jvmdi */
1721   __ jmp(rsi);
1722 
1723   return entry;
1724 } // end of ForceEarlyReturn support
1725 
1726 
1727 //-----------------------------------------------------------------------------
1728 // Helper for vtos entry point generation
1729 
1730 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
1731                                                          address& bep,
1732                                                          address& cep,
1733                                                          address& sep,
1734                                                          address& aep,
1735                                                          address& iep,
1736                                                          address& lep,
1737                                                          address& fep,
1738                                                          address& dep,
1739                                                          address& vep) {
1740   assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
1741   Label L;
1742 #ifndef _LP64
1743   fep = __ pc();     // ftos entry point
1744       __ push(ftos);
1745       __ jmpb(L);
1746   dep = __ pc();     // dtos entry point
1747       __ push(dtos);
1748       __ jmpb(L);
1749 #else
1750   fep = __ pc();     // ftos entry point
1751       __ push_f(xmm0);
1752       __ jmpb(L);
1753   dep = __ pc();     // dtos entry point
1754       __ push_d(xmm0);
1755       __ jmpb(L);
1756 #endif // _LP64
1757   lep = __ pc();     // ltos entry point
1758       __ push_l();
1759       __ jmpb(L);
1760   aep = bep = cep = sep = iep = __ pc();      // [abcsi]tos entry point
1761       __ push_i_or_ptr();
1762   vep = __ pc();    // vtos entry point
1763   __ bind(L);
1764   generate_and_dispatch(t);
1765 }
1766 
1767 //-----------------------------------------------------------------------------
1768 
1769 // Non-product code
1770 #ifndef PRODUCT
1771 
1772 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
1773   address entry = __ pc();
1774 
1775 #ifndef _LP64
1776   // prepare expression stack
1777   __ pop(rcx);          // pop return address so expression stack is 'pure'
1778   __ push(state);       // save tosca
1779 
1780   // pass tosca registers as arguments & call tracer
1781   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), rcx, rax, rdx);
1782   __ mov(rcx, rax);     // make sure return address is not destroyed by pop(state)
1783   __ pop(state);        // restore tosca
1784 
1785   // return
1786   __ jmp(rcx);
1787 #else
1788   __ push(state);
1789   __ push(c_rarg0);
1790   __ push(c_rarg1);
1791   __ push(c_rarg2);
1792   __ push(c_rarg3);
1793   __ mov(c_rarg2, rax);  // Pass itos
1794 #ifdef _WIN64
1795   __ movflt(xmm3, xmm0); // Pass ftos
1796 #endif
1797   __ call_VM(noreg,
1798              CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode),
1799              c_rarg1, c_rarg2, c_rarg3);
1800   __ pop(c_rarg3);
1801   __ pop(c_rarg2);
1802   __ pop(c_rarg1);
1803   __ pop(c_rarg0);
1804   __ pop(state);
1805   __ ret(0);                                   // return from result handler
1806 #endif // _LP64
1807 
1808   return entry;
1809 }
1810 
1811 void TemplateInterpreterGenerator::count_bytecode() {
1812   __ incrementl(ExternalAddress((address) &BytecodeCounter::_counter_value));
1813 }
1814 
1815 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
1816   __ incrementl(ExternalAddress((address) &BytecodeHistogram::_counters[t->bytecode()]));
1817 }
1818 
1819 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
1820   __ mov32(rbx, ExternalAddress((address) &BytecodePairHistogram::_index));
1821   __ shrl(rbx, BytecodePairHistogram::log2_number_of_codes);
1822   __ orl(rbx,
1823          ((int) t->bytecode()) <<
1824          BytecodePairHistogram::log2_number_of_codes);
1825   __ mov32(ExternalAddress((address) &BytecodePairHistogram::_index), rbx);
1826   __ lea(rscratch1, ExternalAddress((address) BytecodePairHistogram::_counters));
1827   __ incrementl(Address(rscratch1, rbx, Address::times_4));
1828 }
1829 
1830 
1831 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
1832   // Call a little run-time stub to avoid blow-up for each bytecode.
1833   // The run-time runtime saves the right registers, depending on
1834   // the tosca in-state for the given template.
1835 
1836   assert(Interpreter::trace_code(t->tos_in()) != NULL,
1837          "entry must have been generated");
1838 #ifndef _LP64
1839   __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in())));
1840 #else
1841   __ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
1842   __ andptr(rsp, -16); // align stack as required by ABI
1843   __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in())));
1844   __ mov(rsp, r12); // restore sp
1845   __ reinit_heapbase();
1846 #endif // _LP64
1847 }
1848 
1849 
1850 void TemplateInterpreterGenerator::stop_interpreter_at() {
1851   Label L;
1852   __ cmp32(ExternalAddress((address) &BytecodeCounter::_counter_value),
1853            StopInterpreterAt);
1854   __ jcc(Assembler::notEqual, L);
1855   __ int3();
1856   __ bind(L);
1857 }
1858 #endif // !PRODUCT