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_sparc.hpp"
  32 #include "runtime/sharedRuntime.hpp"
  33 #include "utilities/macros.hpp"
  34 #include "vmreg_sparc.inline.hpp"
  35 #if INCLUDE_ALL_GCS
  36 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  37 #endif // INCLUDE_ALL_GCS
  38 
  39 #define __ ce->masm()->
  40 
  41 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
  42                                bool throw_index_out_of_bounds_exception)
  43   : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
  44   , _index(index)
  45 {
  46   assert(info != NULL, "must have info");
  47   _info = new CodeEmitInfo(info);
  48 }
  49 
  50 
  51 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
  52   __ bind(_entry);
  53 
  54   if (_info->deoptimize_on_exception()) {
  55     address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
  56     __ call(a, relocInfo::runtime_call_type);
  57     __ delayed()->nop();
  58     ce->add_call_info_here(_info);
  59     ce->verify_oop_map(_info);
  60     debug_only(__ should_not_reach_here());
  61     return;
  62   }
  63 
  64   if (_index->is_register()) {
  65     __ mov(_index->as_register(), G4);
  66   } else {
  67     __ set(_index->as_jint(), G4);
  68   }
  69   if (_throw_index_out_of_bounds_exception) {
  70     __ call(Runtime1::entry_for(Runtime1::throw_index_exception_id), relocInfo::runtime_call_type);
  71   } else {
  72     __ call(Runtime1::entry_for(Runtime1::throw_range_check_failed_id), relocInfo::runtime_call_type);
  73   }
  74   __ delayed()->nop();
  75   ce->add_call_info_here(_info);
  76   ce->verify_oop_map(_info);
  77   debug_only(__ should_not_reach_here());
  78 }
  79 
  80 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
  81   _info = new CodeEmitInfo(info);
  82 }
  83 
  84 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
  85   __ bind(_entry);
  86   address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
  87   __ call(a, relocInfo::runtime_call_type);
  88   __ delayed()->nop();
  89   ce->add_call_info_here(_info);
  90   ce->verify_oop_map(_info);
  91   debug_only(__ should_not_reach_here());
  92 }
  93 
  94 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
  95   __ bind(_entry);
  96   __ set(_bci, G4);
  97   __ call(Runtime1::entry_for(Runtime1::counter_overflow_id), relocInfo::runtime_call_type);
  98   __ delayed()->mov_or_nop(_method->as_register(), G5);
  99   ce->add_call_info_here(_info);
 100   ce->verify_oop_map(_info);
 101 
 102   __ br(Assembler::always, true, Assembler::pt, _continuation);
 103   __ delayed()->nop();
 104 }
 105 
 106 
 107 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
 108   if (_offset != -1) {
 109     ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 110   }
 111   __ bind(_entry);
 112   __ call(Runtime1::entry_for(Runtime1::throw_div0_exception_id), relocInfo::runtime_call_type);
 113   __ delayed()->nop();
 114   ce->add_call_info_here(_info);
 115   ce->verify_oop_map(_info);
 116 #ifdef ASSERT
 117   __ should_not_reach_here();
 118 #endif
 119 }
 120 
 121 
 122 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
 123   address a;
 124   if (_info->deoptimize_on_exception()) {
 125     // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
 126     a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
 127   } else {
 128     a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
 129   }
 130 
 131   ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 132   __ bind(_entry);
 133   __ call(a, relocInfo::runtime_call_type);
 134   __ delayed()->nop();
 135   ce->add_call_info_here(_info);
 136   ce->verify_oop_map(_info);
 137 #ifdef ASSERT
 138   __ should_not_reach_here();
 139 #endif
 140 }
 141 
 142 
 143 // Implementation of SimpleExceptionStub
 144 // Note: %g1 and %g3 are already in use
 145 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
 146   __ bind(_entry);
 147   __ call(Runtime1::entry_for(_stub), relocInfo::runtime_call_type);
 148 
 149   if (_obj->is_valid()) {
 150     __ delayed()->mov(_obj->as_register(), G4); // _obj contains the optional argument to the stub
 151   } else {
 152     __ delayed()->mov(G0, G4);
 153   }
 154   ce->add_call_info_here(_info);
 155 #ifdef ASSERT
 156   __ should_not_reach_here();
 157 #endif
 158 }
 159 
 160 
 161 // Implementation of NewInstanceStub
 162 
 163 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
 164   _result = result;
 165   _klass = klass;
 166   _klass_reg = klass_reg;
 167   _info = new CodeEmitInfo(info);
 168   assert(stub_id == Runtime1::new_instance_id                 ||
 169          stub_id == Runtime1::fast_new_instance_id            ||
 170          stub_id == Runtime1::fast_new_instance_init_check_id,
 171          "need new_instance id");
 172   _stub_id   = stub_id;
 173 }
 174 
 175 
 176 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
 177   __ bind(_entry);
 178   __ call(Runtime1::entry_for(_stub_id), relocInfo::runtime_call_type);
 179   __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);
 180   ce->add_call_info_here(_info);
 181   ce->verify_oop_map(_info);
 182   __ br(Assembler::always, false, Assembler::pt, _continuation);
 183   __ delayed()->mov_or_nop(O0, _result->as_register());
 184 }
 185 
 186 
 187 // Implementation of NewTypeArrayStub
 188 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 189   _klass_reg = klass_reg;
 190   _length = length;
 191   _result = result;
 192   _info = new CodeEmitInfo(info);
 193 }
 194 
 195 
 196 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
 197   __ bind(_entry);
 198 
 199   __ mov(_length->as_register(), G4);
 200   __ call(Runtime1::entry_for(Runtime1::new_type_array_id), relocInfo::runtime_call_type);
 201   __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);
 202   ce->add_call_info_here(_info);
 203   ce->verify_oop_map(_info);
 204   __ br(Assembler::always, false, Assembler::pt, _continuation);
 205   __ delayed()->mov_or_nop(O0, _result->as_register());
 206 }
 207 
 208 
 209 // Implementation of NewObjectArrayStub
 210 
 211 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 212   _klass_reg = klass_reg;
 213   _length = length;
 214   _result = result;
 215   _info = new CodeEmitInfo(info);
 216 }
 217 
 218 
 219 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
 220   __ bind(_entry);
 221 
 222   __ mov(_length->as_register(), G4);
 223   __ call(Runtime1::entry_for(Runtime1::new_object_array_id), relocInfo::runtime_call_type);
 224   __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);
 225   ce->add_call_info_here(_info);
 226   ce->verify_oop_map(_info);
 227   __ br(Assembler::always, false, Assembler::pt, _continuation);
 228   __ delayed()->mov_or_nop(O0, _result->as_register());
 229 }
 230 
 231 
 232 // Implementation of MonitorAccessStubs
 233 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
 234   : MonitorAccessStub(obj_reg, lock_reg) {
 235   _info = new CodeEmitInfo(info);
 236 }
 237 
 238 
 239 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
 240   __ bind(_entry);
 241   __ mov(_obj_reg->as_register(), G4);
 242   if (ce->compilation()->has_fpu_code()) {
 243     __ call(Runtime1::entry_for(Runtime1::monitorenter_id), relocInfo::runtime_call_type);
 244   } else {
 245     __ call(Runtime1::entry_for(Runtime1::monitorenter_nofpu_id), relocInfo::runtime_call_type);
 246   }
 247   __ delayed()->mov_or_nop(_lock_reg->as_register(), G5);
 248   ce->add_call_info_here(_info);
 249   ce->verify_oop_map(_info);
 250   __ br(Assembler::always, true, Assembler::pt, _continuation);
 251   __ delayed()->nop();
 252 }
 253 
 254 
 255 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
 256   __ bind(_entry);
 257   if (_compute_lock) {
 258     ce->monitor_address(_monitor_ix, _lock_reg);
 259   }
 260   if (ce->compilation()->has_fpu_code()) {
 261     __ call(Runtime1::entry_for(Runtime1::monitorexit_id), relocInfo::runtime_call_type);
 262   } else {
 263     __ call(Runtime1::entry_for(Runtime1::monitorexit_nofpu_id), relocInfo::runtime_call_type);
 264   }
 265 
 266   __ delayed()->mov_or_nop(_lock_reg->as_register(), G4);
 267   __ br(Assembler::always, true, Assembler::pt, _continuation);
 268   __ delayed()->nop();
 269 }
 270 
 271 // Implementation of patching:
 272 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
 273 // - Replace original code with a call to the stub
 274 // At Runtime:
 275 // - call to stub, jump to runtime
 276 // - in runtime: preserve all registers (especially objects, i.e., source and destination object)
 277 // - in runtime: after initializing class, restore original code, reexecute instruction
 278 
 279 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
 280 
 281 void PatchingStub::align_patch_site(MacroAssembler* ) {
 282   // patch sites on sparc are always properly aligned.
 283 }
 284 
 285 void PatchingStub::emit_code(LIR_Assembler* ce) {
 286   // copy original code here
 287   assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,
 288          "not enough room for call");
 289   assert((_bytes_to_copy & 0x3) == 0, "must copy a multiple of four bytes");
 290 
 291   Label call_patch;
 292 
 293   int being_initialized_entry = __ offset();
 294 
 295   if (_id == load_klass_id) {
 296     // produce a copy of the load klass instruction for use by the being initialized case
 297 #ifdef ASSERT
 298     address start = __ pc();
 299 #endif
 300     AddressLiteral addrlit(NULL, metadata_Relocation::spec(_index));
 301     __ patchable_set(addrlit, _obj);
 302 
 303 #ifdef ASSERT
 304     for (int i = 0; i < _bytes_to_copy; i++) {
 305       address ptr = (address)(_pc_start + i);
 306       int a_byte = (*ptr) & 0xFF;
 307       assert(a_byte == *start++, "should be the same code");
 308     }
 309 #endif
 310   } else if (_id == load_mirror_id || _id == load_appendix_id) {
 311     // produce a copy of the load mirror instruction for use by the being initialized case
 312 #ifdef ASSERT
 313     address start = __ pc();
 314 #endif
 315     AddressLiteral addrlit(NULL, oop_Relocation::spec(_index));
 316     __ patchable_set(addrlit, _obj);
 317 
 318 #ifdef ASSERT
 319     for (int i = 0; i < _bytes_to_copy; i++) {
 320       address ptr = (address)(_pc_start + i);
 321       int a_byte = (*ptr) & 0xFF;
 322       assert(a_byte == *start++, "should be the same code");
 323     }
 324 #endif
 325   } else {
 326     // make a copy the code which is going to be patched.
 327     for (int i = 0; i < _bytes_to_copy; i++) {
 328       address ptr = (address)(_pc_start + i);
 329       int a_byte = (*ptr) & 0xFF;
 330       __ emit_int8 (a_byte);
 331     }
 332   }
 333 
 334   address end_of_patch = __ pc();
 335   int bytes_to_skip = 0;
 336   if (_id == load_mirror_id) {
 337     int offset = __ offset();
 338     if (CommentedAssembly) {
 339       __ block_comment(" being_initialized check");
 340     }
 341 
 342     // static field accesses have special semantics while the class
 343     // initializer is being run so we emit a test which can be used to
 344     // check that this code is being executed by the initializing
 345     // thread.
 346     assert(_obj != noreg, "must be a valid register");
 347     assert(_index >= 0, "must have oop index");
 348     __ ld_ptr(_obj, java_lang_Class::klass_offset_in_bytes(), G3);
 349     __ ld_ptr(G3, in_bytes(InstanceKlass::init_thread_offset()), G3);
 350     __ cmp_and_brx_short(G2_thread, G3, Assembler::notEqual, Assembler::pn, call_patch);
 351 
 352     // load_klass patches may execute the patched code before it's
 353     // copied back into place so we need to jump back into the main
 354     // code of the nmethod to continue execution.
 355     __ br(Assembler::always, false, Assembler::pt, _patch_site_continuation);
 356     __ delayed()->nop();
 357 
 358     // make sure this extra code gets skipped
 359     bytes_to_skip += __ offset() - offset;
 360   }
 361 
 362   // Now emit the patch record telling the runtime how to find the
 363   // pieces of the patch.  We only need 3 bytes but it has to be
 364   // aligned as an instruction so emit 4 bytes.
 365   int sizeof_patch_record = 4;
 366   bytes_to_skip += sizeof_patch_record;
 367 
 368   // emit the offsets needed to find the code to patch
 369   int being_initialized_entry_offset = __ offset() - being_initialized_entry + sizeof_patch_record;
 370 
 371   // Emit the patch record.  We need to emit a full word, so emit an extra empty byte
 372   __ emit_int8(0);
 373   __ emit_int8(being_initialized_entry_offset);
 374   __ emit_int8(bytes_to_skip);
 375   __ emit_int8(_bytes_to_copy);
 376   address patch_info_pc = __ pc();
 377   assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
 378 
 379   address entry = __ pc();
 380   NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
 381   address target = NULL;
 382   relocInfo::relocType reloc_type = relocInfo::none;
 383   switch (_id) {
 384     case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
 385     case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
 386     case load_mirror_id:   target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
 387     case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
 388     default: ShouldNotReachHere();
 389   }
 390   __ bind(call_patch);
 391 
 392   if (CommentedAssembly) {
 393     __ block_comment("patch entry point");
 394   }
 395   __ call(target, relocInfo::runtime_call_type);
 396   __ delayed()->nop();
 397   assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
 398   ce->add_call_info_here(_info);
 399   __ br(Assembler::always, false, Assembler::pt, _patch_site_entry);
 400   __ delayed()->nop();
 401   if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
 402     CodeSection* cs = __ code_section();
 403     address pc = (address)_pc_start;
 404     RelocIterator iter(cs, pc, pc + 1);
 405     relocInfo::change_reloc_info_for_address(&iter, (address) pc, reloc_type, relocInfo::none);
 406 
 407     pc = (address)(_pc_start + NativeMovConstReg::add_offset);
 408     RelocIterator iter2(cs, pc, pc+1);
 409     relocInfo::change_reloc_info_for_address(&iter2, (address) pc, reloc_type, relocInfo::none);
 410   }
 411 
 412 }
 413 
 414 
 415 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
 416   __ bind(_entry);
 417   __ call(Runtime1::entry_for(Runtime1::deoptimize_id), relocInfo::runtime_call_type);
 418   __ delayed()->nop();
 419   ce->add_call_info_here(_info);
 420   DEBUG_ONLY(__ should_not_reach_here());
 421 }
 422 
 423 
 424 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
 425   //---------------slow case: call to native-----------------
 426   __ bind(_entry);
 427   __ mov(src()->as_register(),     O0);
 428   __ mov(src_pos()->as_register(), O1);
 429   __ mov(dst()->as_register(),     O2);
 430   __ mov(dst_pos()->as_register(), O3);
 431   __ mov(length()->as_register(),  O4);
 432 
 433   ce->emit_static_call_stub();
 434   if (ce->compilation()->bailed_out()) {
 435     return; // CodeCache is full
 436   }
 437 
 438   __ call(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
 439   __ delayed()->nop();
 440   ce->add_call_info_here(info());
 441   ce->verify_oop_map(info());
 442 
 443 #ifndef PRODUCT
 444   __ set((intptr_t)&Runtime1::_arraycopy_slowcase_cnt, O0);
 445   __ ld(O0, 0, O1);
 446   __ inc(O1);
 447   __ st(O1, 0, O0);
 448 #endif
 449 
 450   __ br(Assembler::always, false, Assembler::pt, _continuation);
 451   __ delayed()->nop();
 452 }
 453 
 454 
 455 ///////////////////////////////////////////////////////////////////////////////////
 456 #if INCLUDE_ALL_GCS
 457 
 458 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
 459   // At this point we know that marking is in progress.
 460   // If do_load() is true then we have to emit the
 461   // load of the previous value; otherwise it has already
 462   // been loaded into _pre_val.
 463 
 464   __ bind(_entry);
 465 
 466   assert(pre_val()->is_register(), "Precondition.");
 467   Register pre_val_reg = pre_val()->as_register();
 468 
 469   if (do_load()) {
 470     ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
 471   }
 472 
 473   if (__ is_in_wdisp16_range(_continuation)) {
 474     __ br_null(pre_val_reg, /*annul*/false, Assembler::pt, _continuation);
 475   } else {
 476     __ cmp(pre_val_reg, G0);
 477     __ brx(Assembler::equal, false, Assembler::pn, _continuation);
 478   }
 479   __ delayed()->nop();
 480 
 481   __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_pre_barrier_slow_id));
 482   __ delayed()->mov(pre_val_reg, G4);
 483   __ br(Assembler::always, false, Assembler::pt, _continuation);
 484   __ delayed()->nop();
 485 
 486 }
 487 
 488 jbyte* G1PostBarrierStub::_byte_map_base = NULL;
 489 
 490 jbyte* G1PostBarrierStub::byte_map_base_slow() {
 491   BarrierSet* bs = Universe::heap()->barrier_set();
 492   assert(bs->is_a(BarrierSet::G1SATBCTLogging),
 493          "Must be if we're using this.");
 494   return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;
 495 }
 496 
 497 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
 498   __ bind(_entry);
 499 
 500   assert(addr()->is_register(), "Precondition.");
 501   assert(new_val()->is_register(), "Precondition.");
 502   Register addr_reg = addr()->as_pointer_register();
 503   Register new_val_reg = new_val()->as_register();
 504 
 505   if (__ is_in_wdisp16_range(_continuation)) {
 506     __ br_null(new_val_reg, /*annul*/false, Assembler::pt, _continuation);
 507   } else {
 508     __ cmp(new_val_reg, G0);
 509     __ brx(Assembler::equal, false, Assembler::pn, _continuation);
 510   }
 511   __ delayed()->nop();
 512 
 513   __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_post_barrier_slow_id));
 514   __ delayed()->mov(addr_reg, G4);
 515   __ br(Assembler::always, false, Assembler::pt, _continuation);
 516   __ delayed()->nop();
 517 }
 518 
 519 #endif // INCLUDE_ALL_GCS
 520 ///////////////////////////////////////////////////////////////////////////////////
 521 
 522 #undef __