1 /*
   2  * Copyright (c) 1999, 2012, 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 "vmreg_sparc.inline.hpp"
  34 #ifndef SERIALGC
  35 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  36 #endif
  37 
  38 #define __ ce->masm()->
  39 
  40 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
  41                                bool throw_index_out_of_bounds_exception)
  42   : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
  43   , _index(index)
  44 {
  45   assert(info != NULL, "must have info");
  46   _info = new CodeEmitInfo(info);
  47 }
  48 
  49 
  50 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
  51   __ bind(_entry);
  52 
  53   if (_index->is_register()) {
  54     __ mov(_index->as_register(), G4);
  55   } else {
  56     __ set(_index->as_jint(), G4);
  57   }
  58   if (_throw_index_out_of_bounds_exception) {
  59     __ call(Runtime1::entry_for(Runtime1::throw_index_exception_id), relocInfo::runtime_call_type);
  60   } else {
  61     __ call(Runtime1::entry_for(Runtime1::throw_range_check_failed_id), relocInfo::runtime_call_type);
  62   }
  63   __ delayed()->nop();
  64   ce->add_call_info_here(_info);
  65   ce->verify_oop_map(_info);
  66 #ifdef ASSERT
  67   __ should_not_reach_here();
  68 #endif
  69 }
  70 
  71 
  72 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
  73   __ bind(_entry);
  74   __ set(_bci, G4);
  75   __ call(Runtime1::entry_for(Runtime1::counter_overflow_id), relocInfo::runtime_call_type);
  76   __ delayed()->mov_or_nop(_method->as_register(), G5);
  77   ce->add_call_info_here(_info);
  78   ce->verify_oop_map(_info);
  79 
  80   __ br(Assembler::always, true, Assembler::pt, _continuation);
  81   __ delayed()->nop();
  82 }
  83 
  84 
  85 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
  86   if (_offset != -1) {
  87     ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
  88   }
  89   __ bind(_entry);
  90   __ call(Runtime1::entry_for(Runtime1::throw_div0_exception_id), relocInfo::runtime_call_type);
  91   __ delayed()->nop();
  92   ce->add_call_info_here(_info);
  93   ce->verify_oop_map(_info);
  94 #ifdef ASSERT
  95   __ should_not_reach_here();
  96 #endif
  97 }
  98 
  99 
 100 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
 101   ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 102   __ bind(_entry);
 103   __ call(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id),
 104           relocInfo::runtime_call_type);
 105   __ delayed()->nop();
 106   ce->add_call_info_here(_info);
 107   ce->verify_oop_map(_info);
 108 #ifdef ASSERT
 109   __ should_not_reach_here();
 110 #endif
 111 }
 112 
 113 
 114 // Implementation of SimpleExceptionStub
 115 // Note: %g1 and %g3 are already in use
 116 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
 117   __ bind(_entry);
 118   __ call(Runtime1::entry_for(_stub), relocInfo::runtime_call_type);
 119 
 120   if (_obj->is_valid()) {
 121     __ delayed()->mov(_obj->as_register(), G4); // _obj contains the optional argument to the stub
 122   } else {
 123     __ delayed()->mov(G0, G4);
 124   }
 125   ce->add_call_info_here(_info);
 126 #ifdef ASSERT
 127   __ should_not_reach_here();
 128 #endif
 129 }
 130 
 131 
 132 // Implementation of NewInstanceStub
 133 
 134 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
 135   _result = result;
 136   _klass = klass;
 137   _klass_reg = klass_reg;
 138   _info = new CodeEmitInfo(info);
 139   assert(stub_id == Runtime1::new_instance_id                 ||
 140          stub_id == Runtime1::fast_new_instance_id            ||
 141          stub_id == Runtime1::fast_new_instance_init_check_id,
 142          "need new_instance id");
 143   _stub_id   = stub_id;
 144 }
 145 
 146 
 147 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
 148   __ bind(_entry);
 149   __ call(Runtime1::entry_for(_stub_id), relocInfo::runtime_call_type);
 150   __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);
 151   ce->add_call_info_here(_info);
 152   ce->verify_oop_map(_info);
 153   __ br(Assembler::always, false, Assembler::pt, _continuation);
 154   __ delayed()->mov_or_nop(O0, _result->as_register());
 155 }
 156 
 157 
 158 // Implementation of NewTypeArrayStub
 159 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 160   _klass_reg = klass_reg;
 161   _length = length;
 162   _result = result;
 163   _info = new CodeEmitInfo(info);
 164 }
 165 
 166 
 167 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
 168   __ bind(_entry);
 169 
 170   __ mov(_length->as_register(), G4);
 171   __ call(Runtime1::entry_for(Runtime1::new_type_array_id), relocInfo::runtime_call_type);
 172   __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);
 173   ce->add_call_info_here(_info);
 174   ce->verify_oop_map(_info);
 175   __ br(Assembler::always, false, Assembler::pt, _continuation);
 176   __ delayed()->mov_or_nop(O0, _result->as_register());
 177 }
 178 
 179 
 180 // Implementation of NewObjectArrayStub
 181 
 182 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 183   _klass_reg = klass_reg;
 184   _length = length;
 185   _result = result;
 186   _info = new CodeEmitInfo(info);
 187 }
 188 
 189 
 190 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
 191   __ bind(_entry);
 192 
 193   __ mov(_length->as_register(), G4);
 194   __ call(Runtime1::entry_for(Runtime1::new_object_array_id), relocInfo::runtime_call_type);
 195   __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);
 196   ce->add_call_info_here(_info);
 197   ce->verify_oop_map(_info);
 198   __ br(Assembler::always, false, Assembler::pt, _continuation);
 199   __ delayed()->mov_or_nop(O0, _result->as_register());
 200 }
 201 
 202 
 203 // Implementation of MonitorAccessStubs
 204 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
 205   : MonitorAccessStub(obj_reg, lock_reg) {
 206   _info = new CodeEmitInfo(info);
 207 }
 208 
 209 
 210 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
 211   __ bind(_entry);
 212   __ mov(_obj_reg->as_register(), G4);
 213   if (ce->compilation()->has_fpu_code()) {
 214     __ call(Runtime1::entry_for(Runtime1::monitorenter_id), relocInfo::runtime_call_type);
 215   } else {
 216     __ call(Runtime1::entry_for(Runtime1::monitorenter_nofpu_id), relocInfo::runtime_call_type);
 217   }
 218   __ delayed()->mov_or_nop(_lock_reg->as_register(), G5);
 219   ce->add_call_info_here(_info);
 220   ce->verify_oop_map(_info);
 221   __ br(Assembler::always, true, Assembler::pt, _continuation);
 222   __ delayed()->nop();
 223 }
 224 
 225 
 226 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
 227   __ bind(_entry);
 228   if (_compute_lock) {
 229     ce->monitor_address(_monitor_ix, _lock_reg);
 230   }
 231   if (ce->compilation()->has_fpu_code()) {
 232     __ call(Runtime1::entry_for(Runtime1::monitorexit_id), relocInfo::runtime_call_type);
 233   } else {
 234     __ call(Runtime1::entry_for(Runtime1::monitorexit_nofpu_id), relocInfo::runtime_call_type);
 235   }
 236 
 237   __ delayed()->mov_or_nop(_lock_reg->as_register(), G4);
 238   __ br(Assembler::always, true, Assembler::pt, _continuation);
 239   __ delayed()->nop();
 240 }
 241 
 242 // Implementation of patching:
 243 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
 244 // - Replace original code with a call to the stub
 245 // At Runtime:
 246 // - call to stub, jump to runtime
 247 // - in runtime: preserve all registers (especially objects, i.e., source and destination object)
 248 // - in runtime: after initializing class, restore original code, reexecute instruction
 249 
 250 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
 251 
 252 void PatchingStub::align_patch_site(MacroAssembler* ) {
 253   // patch sites on sparc are always properly aligned.
 254 }
 255 
 256 void PatchingStub::emit_code(LIR_Assembler* ce) {
 257   // copy original code here
 258   assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,
 259          "not enough room for call");
 260   assert((_bytes_to_copy & 0x3) == 0, "must copy a multiple of four bytes");
 261 
 262   Label call_patch;
 263 
 264   int being_initialized_entry = __ offset();
 265 
 266   if (_id == load_klass_id) {
 267     // produce a copy of the load klass instruction for use by the being initialized case
 268 #ifdef ASSERT
 269     address start = __ pc();
 270 #endif
 271     AddressLiteral addrlit(NULL, metadata_Relocation::spec(_index));
 272     __ patchable_set(addrlit, _obj);
 273 
 274 #ifdef ASSERT
 275     for (int i = 0; i < _bytes_to_copy; i++) {
 276       address ptr = (address)(_pc_start + i);
 277       int a_byte = (*ptr) & 0xFF;
 278       assert(a_byte == *start++, "should be the same code");
 279     }
 280 #endif
 281   } else if (_id == load_mirror_id) {
 282     // produce a copy of the load mirror instruction for use by the being initialized case
 283 #ifdef ASSERT
 284     address start = __ pc();
 285 #endif
 286     AddressLiteral addrlit(NULL, oop_Relocation::spec(_index));
 287     __ patchable_set(addrlit, _obj);
 288 
 289 #ifdef ASSERT
 290     for (int i = 0; i < _bytes_to_copy; i++) {
 291       address ptr = (address)(_pc_start + i);
 292       int a_byte = (*ptr) & 0xFF;
 293       assert(a_byte == *start++, "should be the same code");
 294     }
 295 #endif
 296   } else {
 297     // make a copy the code which is going to be patched.
 298     for (int i = 0; i < _bytes_to_copy; i++) {
 299       address ptr = (address)(_pc_start + i);
 300       int a_byte = (*ptr) & 0xFF;
 301       __ emit_int8 (a_byte);
 302     }
 303   }
 304 
 305   address end_of_patch = __ pc();
 306   int bytes_to_skip = 0;
 307   if (_id == load_mirror_id) {
 308     int offset = __ offset();
 309     if (CommentedAssembly) {
 310       __ block_comment(" being_initialized check");
 311     }
 312 
 313     // static field accesses have special semantics while the class
 314     // initializer is being run so we emit a test which can be used to
 315     // check that this code is being executed by the initializing
 316     // thread.
 317     assert(_obj != noreg, "must be a valid register");
 318     assert(_index >= 0, "must have oop index");
 319     __ ld_ptr(_obj, java_lang_Class::klass_offset_in_bytes(), G3);
 320     __ ld_ptr(G3, in_bytes(InstanceKlass::init_thread_offset()), G3);
 321     __ cmp_and_brx_short(G2_thread, G3, Assembler::notEqual, Assembler::pn, call_patch);
 322 
 323     // load_klass patches may execute the patched code before it's
 324     // copied back into place so we need to jump back into the main
 325     // code of the nmethod to continue execution.
 326     __ br(Assembler::always, false, Assembler::pt, _patch_site_continuation);
 327     __ delayed()->nop();
 328 
 329     // make sure this extra code gets skipped
 330     bytes_to_skip += __ offset() - offset;
 331   }
 332 
 333   // Now emit the patch record telling the runtime how to find the
 334   // pieces of the patch.  We only need 3 bytes but it has to be
 335   // aligned as an instruction so emit 4 bytes.
 336   int sizeof_patch_record = 4;
 337   bytes_to_skip += sizeof_patch_record;
 338 
 339   // emit the offsets needed to find the code to patch
 340   int being_initialized_entry_offset = __ offset() - being_initialized_entry + sizeof_patch_record;
 341 
 342   // Emit the patch record.  We need to emit a full word, so emit an extra empty byte
 343   __ emit_int8(0);
 344   __ emit_int8(being_initialized_entry_offset);
 345   __ emit_int8(bytes_to_skip);
 346   __ emit_int8(_bytes_to_copy);
 347   address patch_info_pc = __ pc();
 348   assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
 349 
 350   address entry = __ pc();
 351   NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
 352   address target = NULL;
 353   relocInfo::relocType reloc_type = relocInfo::none;
 354   switch (_id) {
 355     case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
 356     case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
 357     case load_mirror_id:   target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
 358     default: ShouldNotReachHere();
 359   }
 360   __ bind(call_patch);
 361 
 362   if (CommentedAssembly) {
 363     __ block_comment("patch entry point");
 364   }
 365   __ call(target, relocInfo::runtime_call_type);
 366   __ delayed()->nop();
 367   assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
 368   ce->add_call_info_here(_info);
 369   __ br(Assembler::always, false, Assembler::pt, _patch_site_entry);
 370   __ delayed()->nop();
 371   if (_id == load_klass_id || _id == load_mirror_id) {
 372     CodeSection* cs = __ code_section();
 373     address pc = (address)_pc_start;
 374     RelocIterator iter(cs, pc, pc + 1);
 375     relocInfo::change_reloc_info_for_address(&iter, (address) pc, reloc_type, relocInfo::none);
 376 
 377     pc = (address)(_pc_start + NativeMovConstReg::add_offset);
 378     RelocIterator iter2(cs, pc, pc+1);
 379     relocInfo::change_reloc_info_for_address(&iter2, (address) pc, reloc_type, relocInfo::none);
 380   }
 381 
 382 }
 383 
 384 
 385 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
 386   __ bind(_entry);
 387   __ call(Runtime1::entry_for(Runtime1::deoptimize_id), relocInfo::runtime_call_type);
 388   __ delayed()->nop();
 389   ce->add_call_info_here(_info);
 390   DEBUG_ONLY(__ should_not_reach_here());
 391 }
 392 
 393 
 394 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
 395   //---------------slow case: call to native-----------------
 396   __ bind(_entry);
 397   __ mov(src()->as_register(),     O0);
 398   __ mov(src_pos()->as_register(), O1);
 399   __ mov(dst()->as_register(),     O2);
 400   __ mov(dst_pos()->as_register(), O3);
 401   __ mov(length()->as_register(),  O4);
 402 
 403   ce->emit_static_call_stub();
 404 
 405   __ call(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
 406   __ delayed()->nop();
 407   ce->add_call_info_here(info());
 408   ce->verify_oop_map(info());
 409 
 410 #ifndef PRODUCT
 411   __ set((intptr_t)&Runtime1::_arraycopy_slowcase_cnt, O0);
 412   __ ld(O0, 0, O1);
 413   __ inc(O1);
 414   __ st(O1, 0, O0);
 415 #endif
 416 
 417   __ br(Assembler::always, false, Assembler::pt, _continuation);
 418   __ delayed()->nop();
 419 }
 420 
 421 
 422 ///////////////////////////////////////////////////////////////////////////////////
 423 #ifndef SERIALGC
 424 
 425 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
 426   // At this point we know that marking is in progress.
 427   // If do_load() is true then we have to emit the
 428   // load of the previous value; otherwise it has already
 429   // been loaded into _pre_val.
 430 
 431   __ bind(_entry);
 432 
 433   assert(pre_val()->is_register(), "Precondition.");
 434   Register pre_val_reg = pre_val()->as_register();
 435 
 436   if (do_load()) {
 437     ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
 438   }
 439 
 440   if (__ is_in_wdisp16_range(_continuation)) {
 441     __ br_null(pre_val_reg, /*annul*/false, Assembler::pt, _continuation);
 442   } else {
 443     __ cmp(pre_val_reg, G0);
 444     __ brx(Assembler::equal, false, Assembler::pn, _continuation);
 445   }
 446   __ delayed()->nop();
 447 
 448   __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_pre_barrier_slow_id));
 449   __ delayed()->mov(pre_val_reg, G4);
 450   __ br(Assembler::always, false, Assembler::pt, _continuation);
 451   __ delayed()->nop();
 452 
 453 }
 454 
 455 jbyte* G1PostBarrierStub::_byte_map_base = NULL;
 456 
 457 jbyte* G1PostBarrierStub::byte_map_base_slow() {
 458   BarrierSet* bs = Universe::heap()->barrier_set();
 459   assert(bs->is_a(BarrierSet::G1SATBCTLogging),
 460          "Must be if we're using this.");
 461   return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;
 462 }
 463 
 464 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
 465   __ bind(_entry);
 466 
 467   assert(addr()->is_register(), "Precondition.");
 468   assert(new_val()->is_register(), "Precondition.");
 469   Register addr_reg = addr()->as_pointer_register();
 470   Register new_val_reg = new_val()->as_register();
 471 
 472   if (__ is_in_wdisp16_range(_continuation)) {
 473     __ br_null(new_val_reg, /*annul*/false, Assembler::pt, _continuation);
 474   } else {
 475     __ cmp(new_val_reg, G0);
 476     __ brx(Assembler::equal, false, Assembler::pn, _continuation);
 477   }
 478   __ delayed()->nop();
 479 
 480   __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_post_barrier_slow_id));
 481   __ delayed()->mov(addr_reg, G4);
 482   __ br(Assembler::always, false, Assembler::pt, _continuation);
 483   __ delayed()->nop();
 484 }
 485 
 486 #endif // SERIALGC
 487 ///////////////////////////////////////////////////////////////////////////////////
 488 
 489 #undef __