1 /*
   2  * Copyright (c) 1999, 2013, 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 "c1/c1_CodeStubs.hpp"
  27 #include "c1/c1_FrameMap.hpp"
  28 #include "c1/c1_LIRAssembler.hpp"
  29 #include "c1/c1_MacroAssembler.hpp"
  30 #include "c1/c1_Runtime1.hpp"
  31 #include "nativeInst_x86.hpp"
  32 #include "runtime/sharedRuntime.hpp"
  33 #include "utilities/macros.hpp"
  34 #include "vmreg_x86.inline.hpp"
  35 #if INCLUDE_ALL_GCS
  36 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  37 #endif // INCLUDE_ALL_GCS
  38 
  39 
  40 #define __ ce->masm()->
  41 
  42 float ConversionStub::float_zero = 0.0;
  43 double ConversionStub::double_zero = 0.0;
  44 
  45 void ConversionStub::emit_code(LIR_Assembler* ce) {
  46   __ bind(_entry);
  47   assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
  48 
  49 
  50   if (input()->is_single_xmm()) {
  51     __ comiss(input()->as_xmm_float_reg(),
  52               ExternalAddress((address)&float_zero));
  53   } else if (input()->is_double_xmm()) {
  54     __ comisd(input()->as_xmm_double_reg(),
  55               ExternalAddress((address)&double_zero));
  56   } else {
  57     LP64_ONLY(ShouldNotReachHere());
  58     __ push(rax);
  59     __ ftst();
  60     __ fnstsw_ax();
  61     __ sahf();
  62     __ pop(rax);
  63   }
  64 
  65   Label NaN, do_return;
  66   __ jccb(Assembler::parity, NaN);
  67   __ jccb(Assembler::below, do_return);
  68 
  69   // input is > 0 -> return maxInt
  70   // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
  71   __ decrement(result()->as_register());
  72   __ jmpb(do_return);
  73 
  74   // input is NaN -> return 0
  75   __ bind(NaN);
  76   __ xorptr(result()->as_register(), result()->as_register());
  77 
  78   __ bind(do_return);
  79   __ jmp(_continuation);
  80 }
  81 
  82 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
  83   __ bind(_entry);
  84   ce->store_parameter(_method->as_register(), 1);
  85   ce->store_parameter(_bci, 0);
  86   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
  87   ce->add_call_info_here(_info);
  88   ce->verify_oop_map(_info);
  89   __ jmp(_continuation);
  90 }
  91 
  92 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
  93                                bool throw_index_out_of_bounds_exception)
  94   : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
  95   , _index(index)
  96 {
  97   assert(info != NULL, "must have info");
  98   _info = new CodeEmitInfo(info);
  99 }
 100 
 101 
 102 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
 103   __ bind(_entry);
 104   if (_info->deoptimize_on_exception()) {
 105     address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
 106     __ call(RuntimeAddress(a));
 107     ce->add_call_info_here(_info);
 108     ce->verify_oop_map(_info);
 109     debug_only(__ should_not_reach_here());
 110     return;
 111   }
 112 
 113   // pass the array index on stack because all registers must be preserved
 114   if (_index->is_cpu_register()) {
 115     ce->store_parameter(_index->as_register(), 0);
 116   } else {
 117     ce->store_parameter(_index->as_jint(), 0);
 118   }
 119   Runtime1::StubID stub_id;
 120   if (_throw_index_out_of_bounds_exception) {
 121     stub_id = Runtime1::throw_index_exception_id;
 122   } else {
 123     stub_id = Runtime1::throw_range_check_failed_id;
 124   }
 125   __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
 126   ce->add_call_info_here(_info);
 127   ce->verify_oop_map(_info);
 128   debug_only(__ should_not_reach_here());
 129 }
 130 
 131 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
 132   _info = new CodeEmitInfo(info);
 133 }
 134 
 135 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
 136   __ bind(_entry);
 137   address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
 138   __ call(RuntimeAddress(a));
 139   ce->add_call_info_here(_info);
 140   ce->verify_oop_map(_info);
 141   debug_only(__ should_not_reach_here());
 142 }
 143 
 144 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
 145   if (_offset != -1) {
 146     ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 147   }
 148   __ bind(_entry);
 149   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
 150   ce->add_call_info_here(_info);
 151   debug_only(__ should_not_reach_here());
 152 }
 153 
 154 
 155 // Implementation of NewInstanceStub
 156 
 157 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
 158   _result = result;
 159   _klass = klass;
 160   _klass_reg = klass_reg;
 161   _info = new CodeEmitInfo(info);
 162   assert(stub_id == Runtime1::new_instance_id                 ||
 163          stub_id == Runtime1::fast_new_instance_id            ||
 164          stub_id == Runtime1::fast_new_instance_init_check_id,
 165          "need new_instance id");
 166   _stub_id   = stub_id;
 167 }
 168 
 169 
 170 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
 171   assert(__ rsp_offset() == 0, "frame size should be fixed");
 172   __ bind(_entry);
 173   __ movptr(rdx, _klass_reg->as_register());
 174   __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
 175   ce->add_call_info_here(_info);
 176   ce->verify_oop_map(_info);
 177   assert(_result->as_register() == rax, "result must in rax,");
 178   __ jmp(_continuation);
 179 }
 180 
 181 
 182 // Implementation of NewTypeArrayStub
 183 
 184 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 185   _klass_reg = klass_reg;
 186   _length = length;
 187   _result = result;
 188   _info = new CodeEmitInfo(info);
 189 }
 190 
 191 
 192 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
 193   assert(__ rsp_offset() == 0, "frame size should be fixed");
 194   __ bind(_entry);
 195   assert(_length->as_register() == rbx, "length must in rbx,");
 196   assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
 197   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
 198   ce->add_call_info_here(_info);
 199   ce->verify_oop_map(_info);
 200   assert(_result->as_register() == rax, "result must in rax,");
 201   __ jmp(_continuation);
 202 }
 203 
 204 
 205 // Implementation of NewObjectArrayStub
 206 
 207 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 208   _klass_reg = klass_reg;
 209   _result = result;
 210   _length = length;
 211   _info = new CodeEmitInfo(info);
 212 }
 213 
 214 
 215 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
 216   assert(__ rsp_offset() == 0, "frame size should be fixed");
 217   __ bind(_entry);
 218   assert(_length->as_register() == rbx, "length must in rbx,");
 219   assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
 220   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
 221   ce->add_call_info_here(_info);
 222   ce->verify_oop_map(_info);
 223   assert(_result->as_register() == rax, "result must in rax,");
 224   __ jmp(_continuation);
 225 }
 226 
 227 
 228 // Implementation of MonitorAccessStubs
 229 
 230 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
 231 : MonitorAccessStub(obj_reg, lock_reg)
 232 {
 233   _info = new CodeEmitInfo(info);
 234 }
 235 
 236 
 237 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
 238   assert(__ rsp_offset() == 0, "frame size should be fixed");
 239   __ bind(_entry);
 240   ce->store_parameter(_obj_reg->as_register(),  1);
 241   ce->store_parameter(_lock_reg->as_register(), 0);
 242   Runtime1::StubID enter_id;
 243   if (ce->compilation()->has_fpu_code()) {
 244     enter_id = Runtime1::monitorenter_id;
 245   } else {
 246     enter_id = Runtime1::monitorenter_nofpu_id;
 247   }
 248   __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
 249   ce->add_call_info_here(_info);
 250   ce->verify_oop_map(_info);
 251   __ jmp(_continuation);
 252 }
 253 
 254 
 255 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
 256   __ bind(_entry);
 257   if (_compute_lock) {
 258     // lock_reg was destroyed by fast unlocking attempt => recompute it
 259     ce->monitor_address(_monitor_ix, _lock_reg);
 260   }
 261   ce->store_parameter(_lock_reg->as_register(), 0);
 262   // note: non-blocking leaf routine => no call info needed
 263   Runtime1::StubID exit_id;
 264   if (ce->compilation()->has_fpu_code()) {
 265     exit_id = Runtime1::monitorexit_id;
 266   } else {
 267     exit_id = Runtime1::monitorexit_nofpu_id;
 268   }
 269   __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
 270   __ jmp(_continuation);
 271 }
 272 
 273 
 274 // Implementation of patching:
 275 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
 276 // - Replace original code with a call to the stub
 277 // At Runtime:
 278 // - call to stub, jump to runtime
 279 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
 280 // - in runtime: after initializing class, restore original code, reexecute instruction
 281 
 282 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
 283 
 284 void PatchingStub::align_patch_site(MacroAssembler* masm) {
 285   // We're patching a 5-7 byte instruction on intel and we need to
 286   // make sure that we don't see a piece of the instruction.  It
 287   // appears mostly impossible on Intel to simply invalidate other
 288   // processors caches and since they may do aggressive prefetch it's
 289   // very hard to make a guess about what code might be in the icache.
 290   // Force the instruction to be double word aligned so that it
 291   // doesn't span a cache line.
 292   masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
 293 }
 294 
 295 void PatchingStub::emit_code(LIR_Assembler* ce) {
 296   assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
 297 
 298   Label call_patch;
 299 
 300   // static field accesses have special semantics while the class
 301   // initializer is being run so we emit a test which can be used to
 302   // check that this code is being executed by the initializing
 303   // thread.
 304   address being_initialized_entry = __ pc();
 305   if (CommentedAssembly) {
 306     __ block_comment(" patch template");
 307   }
 308   if (_id == load_klass_id) {
 309     // produce a copy of the load klass instruction for use by the being initialized case
 310 #ifdef ASSERT
 311     address start = __ pc();
 312 #endif
 313     Metadata* o = NULL;
 314     __ mov_metadata(_obj, o);
 315 #ifdef ASSERT
 316     for (int i = 0; i < _bytes_to_copy; i++) {
 317       address ptr = (address)(_pc_start + i);
 318       int a_byte = (*ptr) & 0xFF;
 319       assert(a_byte == *start++, "should be the same code");
 320     }
 321 #endif
 322   } else if (_id == load_mirror_id) {
 323     // produce a copy of the load mirror instruction for use by the being
 324     // initialized case
 325 #ifdef ASSERT
 326     address start = __ pc();
 327 #endif
 328     jobject o = NULL;
 329     __ movoop(_obj, o);
 330 #ifdef ASSERT
 331     for (int i = 0; i < _bytes_to_copy; i++) {
 332       address ptr = (address)(_pc_start + i);
 333       int a_byte = (*ptr) & 0xFF;
 334       assert(a_byte == *start++, "should be the same code");
 335     }
 336 #endif
 337   } else {
 338     // make a copy the code which is going to be patched.
 339     for (int i = 0; i < _bytes_to_copy; i++) {
 340       address ptr = (address)(_pc_start + i);
 341       int a_byte = (*ptr) & 0xFF;
 342       __ emit_int8(a_byte);
 343       *ptr = 0x90; // make the site look like a nop
 344     }
 345   }
 346 
 347   address end_of_patch = __ pc();
 348   int bytes_to_skip = 0;
 349   if (_id == load_mirror_id) {
 350     int offset = __ offset();
 351     if (CommentedAssembly) {
 352       __ block_comment(" being_initialized check");
 353     }
 354     assert(_obj != noreg, "must be a valid register");
 355     Register tmp = rax;
 356     Register tmp2 = rbx;
 357     __ push(tmp);
 358     __ push(tmp2);
 359     // Load without verification to keep code size small. We need it because
 360     // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
 361     __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
 362     __ get_thread(tmp);
 363     __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
 364     __ pop(tmp2);
 365     __ pop(tmp);
 366     __ jcc(Assembler::notEqual, call_patch);
 367 
 368     // access_field patches may execute the patched code before it's
 369     // copied back into place so we need to jump back into the main
 370     // code of the nmethod to continue execution.
 371     __ jmp(_patch_site_continuation);
 372 
 373     // make sure this extra code gets skipped
 374     bytes_to_skip += __ offset() - offset;
 375   }
 376   if (CommentedAssembly) {
 377     __ block_comment("patch data encoded as movl");
 378   }
 379   // Now emit the patch record telling the runtime how to find the
 380   // pieces of the patch.  We only need 3 bytes but for readability of
 381   // the disassembly we make the data look like a movl reg, imm32,
 382   // which requires 5 bytes
 383   int sizeof_patch_record = 5;
 384   bytes_to_skip += sizeof_patch_record;
 385 
 386   // emit the offsets needed to find the code to patch
 387   int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
 388 
 389   __ emit_int8((unsigned char)0xB8);
 390   __ emit_int8(0);
 391   __ emit_int8(being_initialized_entry_offset);
 392   __ emit_int8(bytes_to_skip);
 393   __ emit_int8(_bytes_to_copy);
 394   address patch_info_pc = __ pc();
 395   assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
 396 
 397   address entry = __ pc();
 398   NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
 399   address target = NULL;
 400   relocInfo::relocType reloc_type = relocInfo::none;
 401   switch (_id) {
 402     case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
 403     case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
 404     case load_mirror_id:   target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
 405     case load_appendix_id:      target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
 406     default: ShouldNotReachHere();
 407   }
 408   __ bind(call_patch);
 409 
 410   if (CommentedAssembly) {
 411     __ block_comment("patch entry point");
 412   }
 413   __ call(RuntimeAddress(target));
 414   assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
 415   ce->add_call_info_here(_info);
 416   int jmp_off = __ offset();
 417   __ jmp(_patch_site_entry);
 418   // Add enough nops so deoptimization can overwrite the jmp above with a call
 419   // and not destroy the world.
 420   for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
 421     __ nop();
 422   }
 423   if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
 424     CodeSection* cs = __ code_section();
 425     RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
 426     relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
 427   }
 428 }
 429 
 430 
 431 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
 432   __ bind(_entry);
 433   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
 434   ce->add_call_info_here(_info);
 435   DEBUG_ONLY(__ should_not_reach_here());
 436 }
 437 
 438 
 439 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
 440   address a;
 441   if (_info->deoptimize_on_exception()) {
 442     // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
 443     a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
 444   } else {
 445     a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
 446   }
 447 
 448   ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 449   __ bind(_entry);
 450   __ call(RuntimeAddress(a));
 451   ce->add_call_info_here(_info);
 452   ce->verify_oop_map(_info);
 453   debug_only(__ should_not_reach_here());
 454 }
 455 
 456 
 457 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
 458   assert(__ rsp_offset() == 0, "frame size should be fixed");
 459 
 460   __ bind(_entry);
 461   // pass the object on stack because all registers must be preserved
 462   if (_obj->is_cpu_register()) {
 463     ce->store_parameter(_obj->as_register(), 0);
 464   }
 465   __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
 466   ce->add_call_info_here(_info);
 467   debug_only(__ should_not_reach_here());
 468 }
 469 
 470 
 471 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
 472   //---------------slow case: call to native-----------------
 473   __ bind(_entry);
 474   // Figure out where the args should go
 475   // This should really convert the IntrinsicID to the Method* and signature
 476   // but I don't know how to do that.
 477   //
 478   VMRegPair args[5];
 479   BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
 480   SharedRuntime::java_calling_convention(signature, args, 5, true);
 481 
 482   // push parameters
 483   // (src, src_pos, dest, destPos, length)
 484   Register r[5];
 485   r[0] = src()->as_register();
 486   r[1] = src_pos()->as_register();
 487   r[2] = dst()->as_register();
 488   r[3] = dst_pos()->as_register();
 489   r[4] = length()->as_register();
 490 
 491   // next registers will get stored on the stack
 492   for (int i = 0; i < 5 ; i++ ) {
 493     VMReg r_1 = args[i].first();
 494     if (r_1->is_stack()) {
 495       int st_off = r_1->reg2stack() * wordSize;
 496       __ movptr (Address(rsp, st_off), r[i]);
 497     } else {
 498       assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
 499     }
 500   }
 501 
 502   ce->align_call(lir_static_call);
 503 
 504   ce->emit_static_call_stub();
 505   if (ce->compilation()->bailed_out()) {
 506     return; // CodeCache is full
 507   }
 508   AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
 509                          relocInfo::static_call_type);
 510   __ call(resolve);
 511   ce->add_call_info_here(info());
 512 
 513 #ifndef PRODUCT
 514   __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
 515 #endif
 516 
 517   __ jmp(_continuation);
 518 }
 519 
 520 /////////////////////////////////////////////////////////////////////////////
 521 #if INCLUDE_ALL_GCS
 522 
 523 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
 524   // At this point we know that marking is in progress.
 525   // If do_load() is true then we have to emit the
 526   // load of the previous value; otherwise it has already
 527   // been loaded into _pre_val.
 528 
 529   __ bind(_entry);
 530   assert(pre_val()->is_register(), "Precondition.");
 531 
 532   Register pre_val_reg = pre_val()->as_register();
 533 
 534   if (do_load()) {
 535     ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
 536   }
 537 
 538   __ cmpptr(pre_val_reg, (int32_t) NULL_WORD);
 539   __ jcc(Assembler::equal, _continuation);
 540   ce->store_parameter(pre_val()->as_register(), 0);
 541   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));
 542   __ jmp(_continuation);
 543 
 544 }
 545 
 546 jbyte* G1PostBarrierStub::_byte_map_base = NULL;
 547 
 548 jbyte* G1PostBarrierStub::byte_map_base_slow() {
 549   BarrierSet* bs = Universe::heap()->barrier_set();
 550   assert(bs->is_a(BarrierSet::G1SATBCTLogging),
 551          "Must be if we're using this.");
 552   return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;
 553 }
 554 
 555 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
 556   __ bind(_entry);
 557   assert(addr()->is_register(), "Precondition.");
 558   assert(new_val()->is_register(), "Precondition.");
 559   Register new_val_reg = new_val()->as_register();
 560   __ cmpptr(new_val_reg, (int32_t) NULL_WORD);
 561   __ jcc(Assembler::equal, _continuation);
 562   ce->store_parameter(addr()->as_pointer_register(), 0);
 563   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id)));
 564   __ jmp(_continuation);
 565 }
 566 
 567 #endif // INCLUDE_ALL_GCS
 568 /////////////////////////////////////////////////////////////////////////////
 569 
 570 #undef __