1 /*

     2  * Copyright (c) 2003, 2015, 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 "interpreter/bytecodeHistogram.hpp"

    28 #include "interpreter/interpreter.hpp"

    29 #include "interpreter/interpreterGenerator.hpp"

    30 #include "interpreter/interpreterRuntime.hpp"

    31 #include "interpreter/interp_masm.hpp"

    32 #include "interpreter/templateTable.hpp"

    33 #include "oops/arrayOop.hpp"

    34 #include "oops/methodData.hpp"

    35 #include "oops/method.hpp"

    36 #include "oops/oop.inline.hpp"

    37 #include "prims/jvmtiExport.hpp"

    38 #include "prims/jvmtiThreadState.hpp"

    39 #include "runtime/arguments.hpp"

    40 #include "runtime/deoptimization.hpp"

    41 #include "runtime/frame.inline.hpp"

    42 #include "runtime/sharedRuntime.hpp"

    43 #include "runtime/stubRoutines.hpp"

    44 #include "runtime/synchronizer.hpp"

    45 #include "runtime/timer.hpp"

    46 #include "runtime/vframeArray.hpp"

    47 #include "utilities/debug.hpp"

    48 #include "utilities/macros.hpp"

    49 

    50 #define __ _masm->

    51 

    52 #ifndef CC_INTERP

    53 

    54 // Global Register Names

    55 static const Register rbcp     = LP64_ONLY(r13) NOT_LP64(rsi);

    56 static const Register rlocals  = LP64_ONLY(r14) NOT_LP64(rdi);

    57 

    58 const int method_offset = frame::interpreter_frame_method_offset * wordSize;

    59 const int bcp_offset    = frame::interpreter_frame_bcp_offset    * wordSize;

    60 const int locals_offset = frame::interpreter_frame_locals_offset * wordSize;

    61 

    62 //-----------------------------------------------------------------------------

    63 

    64 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {

    65   address entry = __ pc();

    66 

    67 #ifdef ASSERT

    68   {

    69     Label L;

    70     __ lea(rax, Address(rbp,

    71                         frame::interpreter_frame_monitor_block_top_offset *

    72                         wordSize));

    73     __ cmpptr(rax, rsp); // rax = maximal rsp for current rbp (stack

    74                          // grows negative)

    75     __ jcc(Assembler::aboveEqual, L); // check if frame is complete

    76     __ stop ("interpreter frame not set up");

    77     __ bind(L);

    78   }

    79 #endif // ASSERT

    80   // Restore bcp under the assumption that the current frame is still

    81   // interpreted

    82   __ restore_bcp();

    83 

    84   // expression stack must be empty before entering the VM if an

    85   // exception happened

    86   __ empty_expression_stack();

    87   // throw exception

    88   __ call_VM(noreg,

    89              CAST_FROM_FN_PTR(address,

    90                               InterpreterRuntime::throw_StackOverflowError));

    91   return entry;

    92 }

    93 

    94 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(

    95         const char* name) {

    96   address entry = __ pc();

    97   // expression stack must be empty before entering the VM if an

    98   // exception happened

    99   __ empty_expression_stack();

   100   // setup parameters

   101   // ??? convention: expect aberrant index in register ebx

   102   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);

   103   __ lea(rarg, ExternalAddress((address)name));

   104   __ call_VM(noreg,

   105              CAST_FROM_FN_PTR(address,

   106                               InterpreterRuntime::

   107                               throw_ArrayIndexOutOfBoundsException),

   108              rarg, rbx);

   109   return entry;

   110 }

   111 

   112 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {

   113   address entry = __ pc();

   114 

   115   // object is at TOS

   116   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);

   117   __ pop(rarg);

   118 

   119   // expression stack must be empty before entering the VM if an

   120   // exception happened

   121   __ empty_expression_stack();

   122 

   123   __ call_VM(noreg,

   124              CAST_FROM_FN_PTR(address,

   125                               InterpreterRuntime::

   126                               throw_ClassCastException),

   127              rarg);

   128   return entry;

   129 }

   130 

   131 address TemplateInterpreterGenerator::generate_exception_handler_common(

   132         const char* name, const char* message, bool pass_oop) {

   133   assert(!pass_oop || message == NULL, "either oop or message but not both");

   134   address entry = __ pc();

   135 

   136   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);

   137   Register rarg2 = NOT_LP64(rbx) LP64_ONLY(c_rarg2);

   138 

   139   if (pass_oop) {

   140     // object is at TOS

   141     __ pop(rarg2);

   142   }

   143   // expression stack must be empty before entering the VM if an

   144   // exception happened

   145   __ empty_expression_stack();

   146   // setup parameters

   147   __ lea(rarg, ExternalAddress((address)name));

   148   if (pass_oop) {

   149     __ call_VM(rax, CAST_FROM_FN_PTR(address,

   150                                      InterpreterRuntime::

   151                                      create_klass_exception),

   152                rarg, rarg2);

   153   } else {

   154     // kind of lame ExternalAddress can't take NULL because

   155     // external_word_Relocation will assert.

   156     if (message != NULL) {

   157       __ lea(rarg2, ExternalAddress((address)message));

   158     } else {

   159       __ movptr(rarg2, NULL_WORD);

   160     }

   161     __ call_VM(rax,

   162                CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),

   163                rarg, rarg2);

   164   }

   165   // throw exception

   166   __ jump(ExternalAddress(Interpreter::throw_exception_entry()));

   167   return entry;

   168 }

   169 

   170 

   171 address TemplateInterpreterGenerator::generate_continuation_for(TosState state) {

   172   address entry = __ pc();

   173   // NULL last_sp until next java call

   174   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);

   175   __ dispatch_next(state);

   176   return entry;

   177 }

   178 

   179 

   180 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {

   181   address entry = __ pc();

   182 

   183 #ifndef _LP64

   184 #ifdef COMPILER2

   185   // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases

   186   if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {

   187     for (int i = 1; i < 8; i++) {

   188         __ ffree(i);

   189     }

   190   } else if (UseSSE < 2) {

   191     __ empty_FPU_stack();

   192   }

   193 #endif // COMPILER2

   194   if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {

   195     __ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled");

   196   } else {

   197     __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");

   198   }

   199 

   200   if (state == ftos) {

   201     __ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_return_entry_for in interpreter");

   202   } else if (state == dtos) {

   203     __ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_return_entry_for in interpreter");

   204   }

   205 #endif // _LP64

   206 

   207   // Restore stack bottom in case i2c adjusted stack

   208   __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));

   209   // and NULL it as marker that esp is now tos until next java call

   210   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);

   211 

   212   __ restore_bcp();

   213   __ restore_locals();

   214 

   215   if (state == atos) {

   216     Register mdp = rbx;

   217     Register tmp = rcx;

   218     __ profile_return_type(mdp, rax, tmp);

   219   }

   220 

   221   const Register cache = rbx;

   222   const Register index = rcx;

   223   __ get_cache_and_index_at_bcp(cache, index, 1, index_size);

   224 

   225   const Register flags = cache;

   226   __ movl(flags, Address(cache, index, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()));

   227   __ andl(flags, ConstantPoolCacheEntry::parameter_size_mask);

   228   __ lea(rsp, Address(rsp, flags, Interpreter::stackElementScale()));

   229   __ dispatch_next(state, step);

   230 

   231   return entry;

   232 }

   233 

   234 

   235 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step) {

   236   address entry = __ pc();

   237 

   238 #ifndef _LP64

   239   if (state == ftos) {

   240     __ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_deopt_entry_for in interpreter");

   241   } else if (state == dtos) {

   242     __ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_deopt_entry_for in interpreter");

   243   }

   244 #endif // _LP64

   245 

   246   // NULL last_sp until next java call

   247   __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);

   248   __ restore_bcp();

   249   __ restore_locals();

   250   const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);

   251   NOT_LP64(__ get_thread(thread));

   252 #if INCLUDE_JVMCI

   253   // Check if we need to take lock at entry of synchronized method.

   254   if (UseJVMCICompiler) {

   255     Label L;

   256     __ cmpb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);

   257     __ jcc(Assembler::zero, L);

   258     // Clear flag.

   259     __ movb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);

   260     // Satisfy calling convention for lock_method().

   261     __ get_method(rbx);

   262     // Take lock.

   263     lock_method();

   264     __ bind(L);

   265   }

   266 #endif

   267   // handle exceptions

   268   {

   269     Label L;

   270     __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);

   271     __ jcc(Assembler::zero, L);

   272     __ call_VM(noreg,

   273                CAST_FROM_FN_PTR(address,

   274                                 InterpreterRuntime::throw_pending_exception));

   275     __ should_not_reach_here();

   276     __ bind(L);

   277   }

   278   __ dispatch_next(state, step);

   279   return entry;

   280 }

   281 

   282 address TemplateInterpreterGenerator::generate_result_handler_for(

   283         BasicType type) {

   284   address entry = __ pc();

   285   switch (type) {

   286   case T_BOOLEAN: __ c2bool(rax);            break;

   287 #ifndef _LP64

   288   case T_CHAR   : __ andptr(rax, 0xFFFF);    break;

   289 #else

   290   case T_CHAR   : __ movzwl(rax, rax);       break;

   291 #endif // _LP64

   292   case T_BYTE   : __ sign_extend_byte(rax);  break;

   293   case T_SHORT  : __ sign_extend_short(rax); break;

   294   case T_INT    : /* nothing to do */        break;

   295   case T_LONG   : /* nothing to do */        break;

   296   case T_VOID   : /* nothing to do */        break;

   297 #ifndef _LP64

   298   case T_DOUBLE :

   299   case T_FLOAT  :

   300     { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();

   301       __ pop(t);                            // remove return address first

   302       // Must return a result for interpreter or compiler. In SSE

   303       // mode, results are returned in xmm0 and the FPU stack must

   304       // be empty.

   305       if (type == T_FLOAT && UseSSE >= 1) {

   306         // Load ST0

   307         __ fld_d(Address(rsp, 0));

   308         // Store as float and empty fpu stack

   309         __ fstp_s(Address(rsp, 0));

   310         // and reload

   311         __ movflt(xmm0, Address(rsp, 0));

   312       } else if (type == T_DOUBLE && UseSSE >= 2 ) {

   313         __ movdbl(xmm0, Address(rsp, 0));

   314       } else {

   315         // restore ST0

   316         __ fld_d(Address(rsp, 0));

   317       }

   318       // and pop the temp

   319       __ addptr(rsp, 2 * wordSize);

   320       __ push(t);                           // restore return address

   321     }

   322     break;

   323 #else

   324   case T_FLOAT  : /* nothing to do */        break;

   325   case T_DOUBLE : /* nothing to do */        break;

   326 #endif // _LP64

   327 

   328   case T_OBJECT :

   329     // retrieve result from frame

   330     __ movptr(rax, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize));

   331     // and verify it

   332     __ verify_oop(rax);

   333     break;

   334   default       : ShouldNotReachHere();

   335   }

   336   __ ret(0);                                   // return from result handler

   337   return entry;

   338 }

   339 

   340 address TemplateInterpreterGenerator::generate_safept_entry_for(

   341         TosState state,

   342         address runtime_entry) {

   343   address entry = __ pc();

   344   __ push(state);

   345   __ call_VM(noreg, runtime_entry);

   346   __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));

   347   return entry;

   348 }

   349 

   350 

   351 

   352 // Helpers for commoning out cases in the various type of method entries.

   353 //

   354 

   355 

   356 // increment invocation count & check for overflow

   357 //

   358 // Note: checking for negative value instead of overflow

   359 //       so we have a 'sticky' overflow test

   360 //

   361 // rbx: method

   362 // rcx: invocation counter

   363 //

   364 void InterpreterGenerator::generate_counter_incr(

   365         Label* overflow,

   366         Label* profile_method,

   367         Label* profile_method_continue) {

   368   Label done;

   369   // Note: In tiered we increment either counters in Method* or in MDO depending if we're profiling or not.

   370   if (TieredCompilation) {

   371     int increment = InvocationCounter::count_increment;

   372     Label no_mdo;

   373     if (ProfileInterpreter) {

   374       // Are we profiling?

   375       __ movptr(rax, Address(rbx, Method::method_data_offset()));

   376       __ testptr(rax, rax);

   377       __ jccb(Assembler::zero, no_mdo);

   378       // Increment counter in the MDO

   379       const Address mdo_invocation_counter(rax, in_bytes(MethodData::invocation_counter_offset()) +

   380                                                 in_bytes(InvocationCounter::counter_offset()));

   381       const Address mask(rax, in_bytes(MethodData::invoke_mask_offset()));

   382       __ increment_mask_and_jump(mdo_invocation_counter, increment, mask, rcx, false, Assembler::zero, overflow);

   383       __ jmp(done);

   384     }

   385     __ bind(no_mdo);

   386     // Increment counter in MethodCounters

   387     const Address invocation_counter(rax,

   388                   MethodCounters::invocation_counter_offset() +

   389                   InvocationCounter::counter_offset());

   390     __ get_method_counters(rbx, rax, done);

   391     const Address mask(rax, in_bytes(MethodCounters::invoke_mask_offset()));

   392     __ increment_mask_and_jump(invocation_counter, increment, mask, rcx,

   393                                false, Assembler::zero, overflow);

   394     __ bind(done);

   395   } else { // not TieredCompilation

   396     const Address backedge_counter(rax,

   397                   MethodCounters::backedge_counter_offset() +

   398                   InvocationCounter::counter_offset());

   399     const Address invocation_counter(rax,

   400                   MethodCounters::invocation_counter_offset() +

   401                   InvocationCounter::counter_offset());

   402 

   403     __ get_method_counters(rbx, rax, done);

   404 

   405     if (ProfileInterpreter) {

   406       __ incrementl(Address(rax,

   407               MethodCounters::interpreter_invocation_counter_offset()));

   408     }

   409     // Update standard invocation counters

   410     __ movl(rcx, invocation_counter);

   411     __ incrementl(rcx, InvocationCounter::count_increment);

   412     __ movl(invocation_counter, rcx); // save invocation count

   413 

   414     __ movl(rax, backedge_counter);   // load backedge counter

   415     __ andl(rax, InvocationCounter::count_mask_value); // mask out the status bits

   416 

   417     __ addl(rcx, rax);                // add both counters

   418 

   419     // profile_method is non-null only for interpreted method so

   420     // profile_method != NULL == !native_call

   421 

   422     if (ProfileInterpreter && profile_method != NULL) {

   423       // Test to see if we should create a method data oop

   424       __ movptr(rax, Address(rbx, Method::method_counters_offset()));

   425       __ cmp32(rcx, Address(rax, in_bytes(MethodCounters::interpreter_profile_limit_offset())));

   426       __ jcc(Assembler::less, *profile_method_continue);

   427 

   428       // if no method data exists, go to profile_method

   429       __ test_method_data_pointer(rax, *profile_method);

   430     }

   431 

   432     __ movptr(rax, Address(rbx, Method::method_counters_offset()));

   433     __ cmp32(rcx, Address(rax, in_bytes(MethodCounters::interpreter_invocation_limit_offset())));

   434     __ jcc(Assembler::aboveEqual, *overflow);

   435     __ bind(done);

   436   }

   437 }

   438 

   439 void InterpreterGenerator::generate_counter_overflow(Label* do_continue) {

   440 

   441   // Asm interpreter on entry

   442   // r14/rdi - locals

   443   // r13/rsi - bcp

   444   // rbx - method

   445   // rdx - cpool --- DOES NOT APPEAR TO BE TRUE

   446   // rbp - interpreter frame

   447 

   448   // On return (i.e. jump to entry_point) [ back to invocation of interpreter ]

   449   // Everything as it was on entry

   450   // rdx is not restored. Doesn't appear to really be set.

   451 

   452   // InterpreterRuntime::frequency_counter_overflow takes two

   453   // arguments, the first (thread) is passed by call_VM, the second

   454   // indicates if the counter overflow occurs at a backwards branch

   455   // (NULL bcp).  We pass zero for it.  The call returns the address

   456   // of the verified entry point for the method or NULL if the

   457   // compilation did not complete (either went background or bailed

   458   // out).

   459   Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);

   460   __ movl(rarg, 0);

   461   __ call_VM(noreg,

   462              CAST_FROM_FN_PTR(address,

   463                               InterpreterRuntime::frequency_counter_overflow),

   464              rarg);

   465 

   466   __ movptr(rbx, Address(rbp, method_offset));   // restore Method*

   467   // Preserve invariant that r13/r14 contain bcp/locals of sender frame

   468   // and jump to the interpreted entry.

   469   __ jmp(*do_continue, relocInfo::none);

   470 }

   471 

   472 // See if we've got enough room on the stack for locals plus overhead.

   473 // The expression stack grows down incrementally, so the normal guard

   474 // page mechanism will work for that.

   475 //

   476 // NOTE: Since the additional locals are also always pushed (wasn't

   477 // obvious in generate_fixed_frame) so the guard should work for them

   478 // too.

   479 //

   480 // Args:

   481 //      rdx: number of additional locals this frame needs (what we must check)

   482 //      rbx: Method*

   483 //

   484 // Kills:

   485 //      rax

   486 void InterpreterGenerator::generate_stack_overflow_check(void) {

   487 

   488   // monitor entry size: see picture of stack in frame_x86.hpp

   489   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

   490 

   491   // total overhead size: entry_size + (saved rbp through expr stack

   492   // bottom).  be sure to change this if you add/subtract anything

   493   // to/from the overhead area

   494   const int overhead_size =

   495     -(frame::interpreter_frame_initial_sp_offset * wordSize) + entry_size;

   496 

   497   const int page_size = os::vm_page_size();

   498 

   499   Label after_frame_check;

   500 

   501   // see if the frame is greater than one page in size. If so,

   502   // then we need to verify there is enough stack space remaining

   503   // for the additional locals.

   504   __ cmpl(rdx, (page_size - overhead_size) / Interpreter::stackElementSize);

   505   __ jcc(Assembler::belowEqual, after_frame_check);

   506 

   507   // compute rsp as if this were going to be the last frame on

   508   // the stack before the red zone

   509 

   510   Label after_frame_check_pop;

   511   const Register thread = NOT_LP64(rsi) LP64_ONLY(r15_thread);

   512 #ifndef _LP64

   513   __ push(thread);

   514   __ get_thread(thread);

   515 #endif

   516 

   517   const Address stack_base(thread, Thread::stack_base_offset());

   518   const Address stack_size(thread, Thread::stack_size_offset());

   519 

   520   // locals + overhead, in bytes

   521   __ mov(rax, rdx);

   522   __ shlptr(rax, Interpreter::logStackElementSize);  // 2 slots per parameter.

   523   __ addptr(rax, overhead_size);

   524 

   525 #ifdef ASSERT

   526   Label stack_base_okay, stack_size_okay;

   527   // verify that thread stack base is non-zero

   528   __ cmpptr(stack_base, (int32_t)NULL_WORD);

   529   __ jcc(Assembler::notEqual, stack_base_okay);

   530   __ stop("stack base is zero");

   531   __ bind(stack_base_okay);

   532   // verify that thread stack size is non-zero

   533   __ cmpptr(stack_size, 0);

   534   __ jcc(Assembler::notEqual, stack_size_okay);

   535   __ stop("stack size is zero");

   536   __ bind(stack_size_okay);

   537 #endif

   538 

   539   // Add stack base to locals and subtract stack size

   540   __ addptr(rax, stack_base);

   541   __ subptr(rax, stack_size);

   542 

   543   // Use the maximum number of pages we might bang.

   544   const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages :

   545                                                                               (StackRedPages+StackYellowPages);

   546 

   547   // add in the red and yellow zone sizes

   548   __ addptr(rax, max_pages * page_size);

   549 

   550   // check against the current stack bottom

   551   __ cmpptr(rsp, rax);

   552 

   553   __ jcc(Assembler::above, after_frame_check_pop);

   554   NOT_LP64(__ pop(rsi));  // get saved bcp

   555 

   556   // Restore sender's sp as SP. This is necessary if the sender's

   557   // frame is an extended compiled frame (see gen_c2i_adapter())

   558   // and safer anyway in case of JSR292 adaptations.

   559 

   560   __ pop(rax); // return address must be moved if SP is changed

   561   __ mov(rsp, rbcp);

   562   __ push(rax);

   563 

   564   // Note: the restored frame is not necessarily interpreted.

   565   // Use the shared runtime version of the StackOverflowError.

   566   assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");

   567   __ jump(ExternalAddress(StubRoutines::throw_StackOverflowError_entry()));

   568   // all done with frame size check

   569   __ bind(after_frame_check_pop);

   570   NOT_LP64(__ pop(rsi));

   571 

   572   // all done with frame size check

   573   __ bind(after_frame_check);

   574 }

   575 

   576 // Allocate monitor and lock method (asm interpreter)

   577 //

   578 // Args:

   579 //      rbx: Method*

   580 //      r14/rdi: locals

   581 //

   582 // Kills:

   583 //      rax

   584 //      c_rarg0, c_rarg1, c_rarg2, c_rarg3, ...(param regs)

   585 //      rscratch1, rscratch2 (scratch regs)

   586 void TemplateInterpreterGenerator::lock_method() {

   587   // synchronize method

   588   const Address access_flags(rbx, Method::access_flags_offset());

   589   const Address monitor_block_top(

   590         rbp,

   591         frame::interpreter_frame_monitor_block_top_offset * wordSize);

   592   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

   593 

   594 #ifdef ASSERT

   595   {

   596     Label L;

   597     __ movl(rax, access_flags);

   598     __ testl(rax, JVM_ACC_SYNCHRONIZED);

   599     __ jcc(Assembler::notZero, L);

   600     __ stop("method doesn't need synchronization");

   601     __ bind(L);

   602   }

   603 #endif // ASSERT

   604 

   605   // get synchronization object

   606   {

   607     const int mirror_offset = in_bytes(Klass::java_mirror_offset());

   608     Label done;

   609     __ movl(rax, access_flags);

   610     __ testl(rax, JVM_ACC_STATIC);

   611     // get receiver (assume this is frequent case)

   612     __ movptr(rax, Address(rlocals, Interpreter::local_offset_in_bytes(0)));

   613     __ jcc(Assembler::zero, done);

   614     __ movptr(rax, Address(rbx, Method::const_offset()));

   615     __ movptr(rax, Address(rax, ConstMethod::constants_offset()));

   616     __ movptr(rax, Address(rax,

   617                            ConstantPool::pool_holder_offset_in_bytes()));

   618     __ movptr(rax, Address(rax, mirror_offset));

   619 

   620 #ifdef ASSERT

   621     {

   622       Label L;

   623       __ testptr(rax, rax);

   624       __ jcc(Assembler::notZero, L);

   625       __ stop("synchronization object is NULL");

   626       __ bind(L);

   627     }

   628 #endif // ASSERT

   629 

   630     __ bind(done);

   631   }

   632 

   633   // add space for monitor & lock

   634   __ subptr(rsp, entry_size); // add space for a monitor entry

   635   __ movptr(monitor_block_top, rsp);  // set new monitor block top

   636   // store object

   637   __ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax);

   638   const Register lockreg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);

   639   __ movptr(lockreg, rsp); // object address

   640   __ lock_object(lockreg);

   641 }

   642 

   643 // Generate a fixed interpreter frame. This is identical setup for

   644 // interpreted methods and for native methods hence the shared code.

   645 //

   646 // Args:

   647 //      rax: return address

   648 //      rbx: Method*

   649 //      r14/rdi: pointer to locals

   650 //      r13/rsi: sender sp

   651 //      rdx: cp cache

   652 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {

   653   // initialize fixed part of activation frame

   654   __ push(rax);        // save return address

   655   __ enter();          // save old & set new rbp

   656   __ push(rbcp);        // set sender sp

   657   __ push((int)NULL_WORD); // leave last_sp as null

   658   __ movptr(rbcp, Address(rbx, Method::const_offset()));      // get ConstMethod*

   659   __ lea(rbcp, Address(rbcp, ConstMethod::codes_offset())); // get codebase

   660   __ push(rbx);        // save Method*

   661   if (ProfileInterpreter) {

   662     Label method_data_continue;

   663     __ movptr(rdx, Address(rbx, in_bytes(Method::method_data_offset())));

   664     __ testptr(rdx, rdx);

   665     __ jcc(Assembler::zero, method_data_continue);

   666     __ addptr(rdx, in_bytes(MethodData::data_offset()));

   667     __ bind(method_data_continue);

   668     __ push(rdx);      // set the mdp (method data pointer)

   669   } else {

   670     __ push(0);

   671   }

   672 

   673   __ movptr(rdx, Address(rbx, Method::const_offset()));

   674   __ movptr(rdx, Address(rdx, ConstMethod::constants_offset()));

   675   __ movptr(rdx, Address(rdx, ConstantPool::cache_offset_in_bytes()));

   676   __ push(rdx); // set constant pool cache

   677   __ push(rlocals); // set locals pointer

   678   if (native_call) {

   679     __ push(0); // no bcp

   680   } else {

   681     __ push(rbcp); // set bcp

   682   }

   683   __ push(0); // reserve word for pointer to expression stack bottom

   684   __ movptr(Address(rsp, 0), rsp); // set expression stack bottom

   685 }

   686 

   687 // End of helpers

   688 

   689 // Method entry for java.lang.ref.Reference.get.

   690 address InterpreterGenerator::generate_Reference_get_entry(void) {

   691 #if INCLUDE_ALL_GCS

   692   // Code: _aload_0, _getfield, _areturn

   693   // parameter size = 1

   694   //

   695   // The code that gets generated by this routine is split into 2 parts:

   696   //    1. The "intrinsified" code for G1 (or any SATB based GC),

   697   //    2. The slow path - which is an expansion of the regular method entry.

   698   //

   699   // Notes:-

   700   // * In the G1 code we do not check whether we need to block for

   701   //   a safepoint. If G1 is enabled then we must execute the specialized

   702   //   code for Reference.get (except when the Reference object is null)

   703   //   so that we can log the value in the referent field with an SATB

   704   //   update buffer.

   705   //   If the code for the getfield template is modified so that the

   706   //   G1 pre-barrier code is executed when the current method is

   707   //   Reference.get() then going through the normal method entry

   708   //   will be fine.

   709   // * The G1 code can, however, check the receiver object (the instance

   710   //   of java.lang.Reference) and jump to the slow path if null. If the

   711   //   Reference object is null then we obviously cannot fetch the referent

   712   //   and so we don't need to call the G1 pre-barrier. Thus we can use the

   713   //   regular method entry code to generate the NPE.

   714   //

   715   // rbx: Method*

   716 

   717   // r13: senderSP must preserve for slow path, set SP to it on fast path

   718 

   719   address entry = __ pc();

   720 

   721   const int referent_offset = java_lang_ref_Reference::referent_offset;

   722   guarantee(referent_offset > 0, "referent offset not initialized");

   723 

   724   if (UseG1GC) {

   725     Label slow_path;

   726     // rbx: method

   727 

   728     // Check if local 0 != NULL

   729     // If the receiver is null then it is OK to jump to the slow path.

   730     __ movptr(rax, Address(rsp, wordSize));

   731 

   732     __ testptr(rax, rax);

   733     __ jcc(Assembler::zero, slow_path);

   734 

   735     // rax: local 0

   736     // rbx: method (but can be used as scratch now)

   737     // rdx: scratch

   738     // rdi: scratch

   739 

   740     // Preserve the sender sp in case the pre-barrier

   741     // calls the runtime

   742     NOT_LP64(__ push(rsi));

   743 

   744     // Generate the G1 pre-barrier code to log the value of

   745     // the referent field in an SATB buffer.

   746 

   747     // Load the value of the referent field.

   748     const Address field_address(rax, referent_offset);

   749     __ load_heap_oop(rax, field_address);

   750 

   751     const Register sender_sp = NOT_LP64(rsi) LP64_ONLY(r13);

   752     const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);

   753     NOT_LP64(__ get_thread(thread));

   754 

   755     // Generate the G1 pre-barrier code to log the value of

   756     // the referent field in an SATB buffer.

   757     __ g1_write_barrier_pre(noreg /* obj */,

   758                             rax /* pre_val */,

   759                             thread /* thread */,

   760                             rbx /* tmp */,

   761                             true /* tosca_live */,

   762                             true /* expand_call */);

   763 

   764     // _areturn

   765     NOT_LP64(__ pop(rsi));      // get sender sp

   766     __ pop(rdi);                // get return address

   767     __ mov(rsp, sender_sp);     // set sp to sender sp

   768     __ jmp(rdi);

   769     __ ret(0);

   770 

   771     // generate a vanilla interpreter entry as the slow path

   772     __ bind(slow_path);

   773     __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));

   774     return entry;

   775   }

   776 #endif // INCLUDE_ALL_GCS

   777 

   778   // If G1 is not enabled then attempt to go through the accessor entry point

   779   // Reference.get is an accessor

   780   return NULL;

   781 }

   782 

   783 // Interpreter stub for calling a native method. (asm interpreter)

   784 // This sets up a somewhat different looking stack for calling the

   785 // native method than the typical interpreter frame setup.

   786 address InterpreterGenerator::generate_native_entry(bool synchronized) {

   787   // determine code generation flags

   788   bool inc_counter  = UseCompiler || CountCompiledCalls || LogTouchedMethods;

   789 

   790   // rbx: Method*

   791   // rbcp: sender sp

   792 

   793   address entry_point = __ pc();

   794 

   795   const Address constMethod       (rbx, Method::const_offset());

   796   const Address access_flags      (rbx, Method::access_flags_offset());

   797   const Address size_of_parameters(rcx, ConstMethod::

   798                                         size_of_parameters_offset());

   799 

   800 

   801   // get parameter size (always needed)

   802   __ movptr(rcx, constMethod);

   803   __ load_unsigned_short(rcx, size_of_parameters);

   804 

   805   // native calls don't need the stack size check since they have no

   806   // expression stack and the arguments are already on the stack and

   807   // we only add a handful of words to the stack

   808 

   809   // rbx: Method*

   810   // rcx: size of parameters

   811   // rbcp: sender sp

   812   __ pop(rax);                                       // get return address

   813 

   814   // for natives the size of locals is zero

   815 

   816   // compute beginning of parameters

   817   __ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));

   818 

   819   // add 2 zero-initialized slots for native calls

   820   // initialize result_handler slot

   821   __ push((int) NULL_WORD);

   822   // slot for oop temp

   823   // (static native method holder mirror/jni oop result)

   824   __ push((int) NULL_WORD);

   825 

   826   // initialize fixed part of activation frame

   827   generate_fixed_frame(true);

   828 

   829   // make sure method is native & not abstract

   830 #ifdef ASSERT

   831   __ movl(rax, access_flags);

   832   {

   833     Label L;

   834     __ testl(rax, JVM_ACC_NATIVE);

   835     __ jcc(Assembler::notZero, L);

   836     __ stop("tried to execute non-native method as native");

   837     __ bind(L);

   838   }

   839   {

   840     Label L;

   841     __ testl(rax, JVM_ACC_ABSTRACT);

   842     __ jcc(Assembler::zero, L);

   843     __ stop("tried to execute abstract method in interpreter");

   844     __ bind(L);

   845   }

   846 #endif

   847 

   848   // Since at this point in the method invocation the exception handler

   849   // would try to exit the monitor of synchronized methods which hasn't

   850   // been entered yet, we set the thread local variable

   851   // _do_not_unlock_if_synchronized to true. The remove_activation will

   852   // check this flag.

   853 

   854   const Register thread1 = NOT_LP64(rax) LP64_ONLY(r15_thread);

   855   NOT_LP64(__ get_thread(thread1));

   856   const Address do_not_unlock_if_synchronized(thread1,

   857         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));

   858   __ movbool(do_not_unlock_if_synchronized, true);

   859 

   860   // increment invocation count & check for overflow

   861   Label invocation_counter_overflow;

   862   if (inc_counter) {

   863     generate_counter_incr(&invocation_counter_overflow, NULL, NULL);

   864   }

   865 

   866   Label continue_after_compile;

   867   __ bind(continue_after_compile);

   868 

   869   bang_stack_shadow_pages(true);

   870 

   871   // reset the _do_not_unlock_if_synchronized flag

   872   NOT_LP64(__ get_thread(thread1));

   873   __ movbool(do_not_unlock_if_synchronized, false);

   874 

   875   // check for synchronized methods

   876   // Must happen AFTER invocation_counter check and stack overflow check,

   877   // so method is not locked if overflows.

   878   if (synchronized) {

   879     lock_method();

   880   } else {

   881     // no synchronization necessary

   882 #ifdef ASSERT

   883     {

   884       Label L;

   885       __ movl(rax, access_flags);

   886       __ testl(rax, JVM_ACC_SYNCHRONIZED);

   887       __ jcc(Assembler::zero, L);

   888       __ stop("method needs synchronization");

   889       __ bind(L);

   890     }

   891 #endif

   892   }

   893 

   894   // start execution

   895 #ifdef ASSERT

   896   {

   897     Label L;

   898     const Address monitor_block_top(rbp,

   899                  frame::interpreter_frame_monitor_block_top_offset * wordSize);

   900     __ movptr(rax, monitor_block_top);

   901     __ cmpptr(rax, rsp);

   902     __ jcc(Assembler::equal, L);

   903     __ stop("broken stack frame setup in interpreter");

   904     __ bind(L);

   905   }

   906 #endif

   907 

   908   // jvmti support

   909   __ notify_method_entry();

   910 

   911   // work registers

   912   const Register method = rbx;

   913   const Register thread = NOT_LP64(rdi) LP64_ONLY(r15_thread);

   914   const Register t      = NOT_LP64(rcx) LP64_ONLY(r11);

   915 

   916   // allocate space for parameters

   917   __ get_method(method);

   918   __ movptr(t, Address(method, Method::const_offset()));

   919   __ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset()));

   920 

   921 #ifndef _LP64

   922   __ shlptr(t, Interpreter::logStackElementSize);

   923   __ addptr(t, 2*wordSize);     // allocate two more slots for JNIEnv and possible mirror

   924   __ subptr(rsp, t);

   925   __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics

   926 #else

   927   __ shll(t, Interpreter::logStackElementSize);

   928 

   929   __ subptr(rsp, t);

   930   __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows

   931   __ andptr(rsp, -16); // must be 16 byte boundary (see amd64 ABI)

   932 #endif // _LP64

   933 

   934   // get signature handler

   935   {

   936     Label L;

   937     __ movptr(t, Address(method, Method::signature_handler_offset()));

   938     __ testptr(t, t);

   939     __ jcc(Assembler::notZero, L);

   940     __ call_VM(noreg,

   941                CAST_FROM_FN_PTR(address,

   942                                 InterpreterRuntime::prepare_native_call),

   943                method);

   944     __ get_method(method);

   945     __ movptr(t, Address(method, Method::signature_handler_offset()));

   946     __ bind(L);

   947   }

   948 

   949   // call signature handler

   950   assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rlocals,

   951          "adjust this code");

   952   assert(InterpreterRuntime::SignatureHandlerGenerator::to() == rsp,

   953          "adjust this code");

   954   assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == NOT_LP64(t) LP64_ONLY(rscratch1),

   955          "adjust this code");

   956 

   957   // The generated handlers do not touch RBX (the method oop).

   958   // However, large signatures cannot be cached and are generated

   959   // each time here.  The slow-path generator can do a GC on return,

   960   // so we must reload it after the call.

   961   __ call(t);

   962   __ get_method(method);        // slow path can do a GC, reload RBX

   963 

   964 

   965   // result handler is in rax

   966   // set result handler

   967   __ movptr(Address(rbp,

   968                     (frame::interpreter_frame_result_handler_offset) * wordSize),

   969             rax);

   970 

   971   // pass mirror handle if static call

   972   {

   973     Label L;

   974     const int mirror_offset = in_bytes(Klass::java_mirror_offset());

   975     __ movl(t, Address(method, Method::access_flags_offset()));

   976     __ testl(t, JVM_ACC_STATIC);

   977     __ jcc(Assembler::zero, L);

   978     // get mirror

   979     __ movptr(t, Address(method, Method::const_offset()));

   980     __ movptr(t, Address(t, ConstMethod::constants_offset()));

   981     __ movptr(t, Address(t, ConstantPool::pool_holder_offset_in_bytes()));

   982     __ movptr(t, Address(t, mirror_offset));

   983     // copy mirror into activation frame

   984     __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize),

   985             t);

   986     // pass handle to mirror

   987 #ifndef _LP64

   988     __ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));

   989     __ movptr(Address(rsp, wordSize), t);

   990 #else

   991     __ lea(c_rarg1,

   992            Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));

   993 #endif // _LP64

   994     __ bind(L);

   995   }

   996 

   997   // get native function entry point

   998   {

   999     Label L;

  1000     __ movptr(rax, Address(method, Method::native_function_offset()));

  1001     ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry());

  1002     __ cmpptr(rax, unsatisfied.addr());

  1003     __ jcc(Assembler::notEqual, L);

  1004     __ call_VM(noreg,

  1005                CAST_FROM_FN_PTR(address,

  1006                                 InterpreterRuntime::prepare_native_call),

  1007                method);

  1008     __ get_method(method);

  1009     __ movptr(rax, Address(method, Method::native_function_offset()));

  1010     __ bind(L);

  1011   }

  1012 

  1013   // pass JNIEnv

  1014 #ifndef _LP64

  1015    __ get_thread(thread);

  1016    __ lea(t, Address(thread, JavaThread::jni_environment_offset()));

  1017    __ movptr(Address(rsp, 0), t);

  1018 

  1019    // set_last_Java_frame_before_call

  1020    // It is enough that the pc()

  1021    // points into the right code segment. It does not have to be the correct return pc.

  1022    __ set_last_Java_frame(thread, noreg, rbp, __ pc());

  1023 #else

  1024    __ lea(c_rarg0, Address(r15_thread, JavaThread::jni_environment_offset()));

  1025 

  1026    // It is enough that the pc() points into the right code

  1027    // segment. It does not have to be the correct return pc.

  1028    __ set_last_Java_frame(rsp, rbp, (address) __ pc());

  1029 #endif // _LP64

  1030 

  1031   // change thread state

  1032 #ifdef ASSERT

  1033   {

  1034     Label L;

  1035     __ movl(t, Address(thread, JavaThread::thread_state_offset()));

  1036     __ cmpl(t, _thread_in_Java);

  1037     __ jcc(Assembler::equal, L);

  1038     __ stop("Wrong thread state in native stub");

  1039     __ bind(L);

  1040   }

  1041 #endif

  1042 

  1043   // Change state to native

  1044 

  1045   __ movl(Address(thread, JavaThread::thread_state_offset()),

  1046           _thread_in_native);

  1047 

  1048   // Call the native method.

  1049   __ call(rax);

  1050   // 32: result potentially in rdx:rax or ST0

  1051   // 64: result potentially in rax or xmm0

  1052 

  1053   // Verify or restore cpu control state after JNI call

  1054   __ restore_cpu_control_state_after_jni();

  1055 

  1056   // NOTE: The order of these pushes is known to frame::interpreter_frame_result

  1057   // in order to extract the result of a method call. If the order of these

  1058   // pushes change or anything else is added to the stack then the code in

  1059   // interpreter_frame_result must also change.

  1060 

  1061 #ifndef _LP64

  1062   // save potential result in ST(0) & rdx:rax

  1063   // (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 -

  1064   // the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers)

  1065   // It is safe to do this push because state is _thread_in_native and return address will be found

  1066   // via _last_native_pc and not via _last_jave_sp

  1067 

  1068   // NOTE: the order of theses push(es) is known to frame::interpreter_frame_result.

  1069   // If the order changes or anything else is added to the stack the code in

  1070   // interpreter_frame_result will have to be changed.

  1071 

  1072   { Label L;

  1073     Label push_double;

  1074     ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));

  1075     ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));

  1076     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),

  1077               float_handler.addr());

  1078     __ jcc(Assembler::equal, push_double);

  1079     __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),

  1080               double_handler.addr());

  1081     __ jcc(Assembler::notEqual, L);

  1082     __ bind(push_double);

  1083     __ push_d(); // FP values are returned using the FPU, so push FPU contents (even if UseSSE > 0).

  1084     __ bind(L);

  1085   }

  1086 #else

  1087   __ push(dtos);

  1088 #endif // _LP64

  1089 

  1090   __ push(ltos);

  1091 

  1092   // change thread state

  1093   NOT_LP64(__ get_thread(thread));

  1094   __ movl(Address(thread, JavaThread::thread_state_offset()),

  1095           _thread_in_native_trans);

  1096 

  1097   if (os::is_MP()) {

  1098     if (UseMembar) {

  1099       // Force this write out before the read below

  1100       __ membar(Assembler::Membar_mask_bits(

  1101            Assembler::LoadLoad | Assembler::LoadStore |

  1102            Assembler::StoreLoad | Assembler::StoreStore));

  1103     } else {

  1104       // Write serialization page so VM thread can do a pseudo remote membar.

  1105       // We use the current thread pointer to calculate a thread specific

  1106       // offset to write to within the page. This minimizes bus traffic

  1107       // due to cache line collision.

  1108       __ serialize_memory(thread, rcx);

  1109     }

  1110   }

  1111 

  1112 #ifndef _LP64

  1113   if (AlwaysRestoreFPU) {

  1114     //  Make sure the control word is correct.

  1115     __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));

  1116   }

  1117 #endif // _LP64

  1118 

  1119   // check for safepoint operation in progress and/or pending suspend requests

  1120   {

  1121     Label Continue;

  1122     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),

  1123              SafepointSynchronize::_not_synchronized);

  1124 

  1125     Label L;

  1126     __ jcc(Assembler::notEqual, L);

  1127     __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);

  1128     __ jcc(Assembler::equal, Continue);

  1129     __ bind(L);

  1130 

  1131     // Don't use call_VM as it will see a possible pending exception

  1132     // and forward it and never return here preventing us from

  1133     // clearing _last_native_pc down below.  Also can't use

  1134     // call_VM_leaf either as it will check to see if r13 & r14 are