1 /*
   2  * Copyright (c) 1999, 2011, 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 "vmreg_x86.inline.hpp"
  34 #ifndef SERIALGC
  35 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  36 #endif
  37 
  38 
  39 #define __ ce->masm()->
  40 
  41 float ConversionStub::float_zero = 0.0;
  42 double ConversionStub::double_zero = 0.0;
  43 
  44 void ConversionStub::emit_code(LIR_Assembler* ce) {
  45   __ bind(_entry);
  46   assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
  47 
  48 
  49   if (input()->is_single_xmm()) {
  50     __ comiss(input()->as_xmm_float_reg(),
  51               ExternalAddress((address)&float_zero));
  52   } else if (input()->is_double_xmm()) {
  53     __ comisd(input()->as_xmm_double_reg(),
  54               ExternalAddress((address)&double_zero));
  55   } else {
  56     LP64_ONLY(ShouldNotReachHere());
  57     __ push(rax);
  58     __ ftst();
  59     __ fnstsw_ax();
  60     __ sahf();
  61     __ pop(rax);
  62   }
  63 
  64   Label NaN, do_return;
  65   __ jccb(Assembler::parity, NaN);
  66   __ jccb(Assembler::below, do_return);
  67 
  68   // input is > 0 -> return maxInt
  69   // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
  70   __ decrement(result()->as_register());
  71   __ jmpb(do_return);
  72 
  73   // input is NaN -> return 0
  74   __ bind(NaN);
  75   __ xorptr(result()->as_register(), result()->as_register());
  76 
  77   __ bind(do_return);
  78   __ jmp(_continuation);
  79 }
  80 
  81 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
  82   __ bind(_entry);
  83   ce->store_parameter(_method->as_register(), 1);
  84   ce->store_parameter(_bci, 0);
  85   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
  86   ce->add_call_info_here(_info);
  87   ce->verify_oop_map(_info);
  88   __ jmp(_continuation);
  89 }
  90 
  91 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
  92                                bool throw_index_out_of_bounds_exception)
  93   : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
  94   , _index(index)
  95 {
  96   assert(info != NULL, "must have info");
  97   _info = new CodeEmitInfo(info);
  98 }
  99 
 100 
 101 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
 102   __ bind(_entry);
 103   // pass the array index on stack because all registers must be preserved
 104   if (_index->is_cpu_register()) {
 105     ce->store_parameter(_index->as_register(), 0);
 106   } else {
 107     ce->store_parameter(_index->as_jint(), 0);
 108   }
 109   Runtime1::StubID stub_id;
 110   if (_throw_index_out_of_bounds_exception) {
 111     stub_id = Runtime1::throw_index_exception_id;
 112   } else {
 113     stub_id = Runtime1::throw_range_check_failed_id;
 114   }
 115   __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
 116   ce->add_call_info_here(_info);
 117   debug_only(__ should_not_reach_here());
 118 }
 119 
 120 
 121 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
 122   if (_offset != -1) {
 123     ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 124   }
 125   __ bind(_entry);
 126   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
 127   ce->add_call_info_here(_info);
 128   debug_only(__ should_not_reach_here());
 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   assert(__ rsp_offset() == 0, "frame size should be fixed");
 149   __ bind(_entry);
 150   __ movptr(rdx, _klass_reg->as_register());
 151   __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
 152   ce->add_call_info_here(_info);
 153   ce->verify_oop_map(_info);
 154   assert(_result->as_register() == rax, "result must in rax,");
 155   __ jmp(_continuation);
 156 }
 157 
 158 
 159 // Implementation of NewTypeArrayStub
 160 
 161 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 162   _klass_reg = klass_reg;
 163   _length = length;
 164   _result = result;
 165   _info = new CodeEmitInfo(info);
 166 }
 167 
 168 
 169 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
 170   assert(__ rsp_offset() == 0, "frame size should be fixed");
 171   __ bind(_entry);
 172   assert(_length->as_register() == rbx, "length must in rbx,");
 173   assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
 174   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_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 NewObjectArrayStub
 183 
 184 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
 185   _klass_reg = klass_reg;
 186   _result = result;
 187   _length = length;
 188   _info = new CodeEmitInfo(info);
 189 }
 190 
 191 
 192 void NewObjectArrayStub::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_object_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 MonitorAccessStubs
 206 
 207 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
 208 : MonitorAccessStub(obj_reg, lock_reg)
 209 {
 210   _info = new CodeEmitInfo(info);
 211 }
 212 
 213 
 214 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
 215   assert(__ rsp_offset() == 0, "frame size should be fixed");
 216   __ bind(_entry);
 217   ce->store_parameter(_obj_reg->as_register(),  1);
 218   ce->store_parameter(_lock_reg->as_register(), 0);
 219   Runtime1::StubID enter_id;
 220   if (ce->compilation()->has_fpu_code()) {
 221     enter_id = Runtime1::monitorenter_id;
 222   } else {
 223     enter_id = Runtime1::monitorenter_nofpu_id;
 224   }
 225   __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
 226   ce->add_call_info_here(_info);
 227   ce->verify_oop_map(_info);
 228   __ jmp(_continuation);
 229 }
 230 
 231 
 232 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
 233   __ bind(_entry);
 234   if (_compute_lock) {
 235     // lock_reg was destroyed by fast unlocking attempt => recompute it
 236     ce->monitor_address(_monitor_ix, _lock_reg);
 237   }
 238   ce->store_parameter(_lock_reg->as_register(), 0);
 239   // note: non-blocking leaf routine => no call info needed
 240   Runtime1::StubID exit_id;
 241   if (ce->compilation()->has_fpu_code()) {
 242     exit_id = Runtime1::monitorexit_id;
 243   } else {
 244     exit_id = Runtime1::monitorexit_nofpu_id;
 245   }
 246   __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
 247   __ jmp(_continuation);
 248 }
 249 
 250 
 251 // Implementation of patching:
 252 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
 253 // - Replace original code with a call to the stub
 254 // At Runtime:
 255 // - call to stub, jump to runtime
 256 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
 257 // - in runtime: after initializing class, restore original code, reexecute instruction
 258 
 259 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
 260 
 261 void PatchingStub::align_patch_site(MacroAssembler* masm) {
 262   // We're patching a 5-7 byte instruction on intel and we need to
 263   // make sure that we don't see a piece of the instruction.  It
 264   // appears mostly impossible on Intel to simply invalidate other
 265   // processors caches and since they may do aggressive prefetch it's
 266   // very hard to make a guess about what code might be in the icache.
 267   // Force the instruction to be double word aligned so that it
 268   // doesn't span a cache line.
 269   masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
 270 }
 271 
 272 void PatchingStub::emit_code(LIR_Assembler* ce) {
 273   assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
 274 
 275   Label call_patch;
 276 
 277   // static field accesses have special semantics while the class
 278   // initializer is being run so we emit a test which can be used to
 279   // check that this code is being executed by the initializing
 280   // thread.
 281   address being_initialized_entry = __ pc();
 282   if (CommentedAssembly) {
 283     __ block_comment(" patch template");
 284   }
 285   if (_id == load_klass_id) {
 286     // produce a copy of the load klass instruction for use by the being initialized case
 287     address start = __ pc();
 288     jobject o = NULL;
 289     __ movoop(_obj, o);
 290 #ifdef ASSERT
 291     for (int i = 0; i < _bytes_to_copy; i++) {
 292       address ptr = (address)(_pc_start + i);
 293       int a_byte = (*ptr) & 0xFF;
 294       assert(a_byte == *start++, "should be the same code");
 295     }
 296 #endif
 297   } else {
 298     // make a copy the code which is going to be patched.
 299     for ( int i = 0; i < _bytes_to_copy; i++) {
 300       address ptr = (address)(_pc_start + i);
 301       int a_byte = (*ptr) & 0xFF;
 302       __ a_byte (a_byte);
 303       *ptr = 0x90; // make the site look like a nop
 304     }
 305   }
 306 
 307   address end_of_patch = __ pc();
 308   int bytes_to_skip = 0;
 309   if (_id == load_klass_id) {
 310     int offset = __ offset();
 311     if (CommentedAssembly) {
 312       __ block_comment(" being_initialized check");
 313     }
 314     assert(_obj != noreg, "must be a valid register");
 315     Register tmp = rax;
 316     Register tmp2 = rbx;
 317     __ push(tmp);
 318     __ push(tmp2);
 319     __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
 320     __ get_thread(tmp);
 321     __ cmpptr(tmp, Address(tmp2, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
 322     __ pop(tmp2);
 323     __ pop(tmp);
 324     __ jcc(Assembler::notEqual, call_patch);
 325 
 326     // access_field patches may execute the patched code before it's
 327     // copied back into place so we need to jump back into the main
 328     // code of the nmethod to continue execution.
 329     __ jmp(_patch_site_continuation);
 330 
 331     // make sure this extra code gets skipped
 332     bytes_to_skip += __ offset() - offset;
 333   }
 334   if (CommentedAssembly) {
 335     __ block_comment("patch data encoded as movl");
 336   }
 337   // Now emit the patch record telling the runtime how to find the
 338   // pieces of the patch.  We only need 3 bytes but for readability of
 339   // the disassembly we make the data look like a movl reg, imm32,
 340   // which requires 5 bytes
 341   int sizeof_patch_record = 5;
 342   bytes_to_skip += sizeof_patch_record;
 343 
 344   // emit the offsets needed to find the code to patch
 345   int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
 346 
 347   __ a_byte(0xB8);
 348   __ a_byte(0);
 349   __ a_byte(being_initialized_entry_offset);
 350   __ a_byte(bytes_to_skip);
 351   __ a_byte(_bytes_to_copy);
 352   address patch_info_pc = __ pc();
 353   assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
 354 
 355   address entry = __ pc();
 356   NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
 357   address target = NULL;
 358   switch (_id) {
 359     case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
 360     case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;
 361     default: ShouldNotReachHere();
 362   }
 363   __ bind(call_patch);
 364 
 365   if (CommentedAssembly) {
 366     __ block_comment("patch entry point");
 367   }
 368   __ call(RuntimeAddress(target));
 369   assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
 370   ce->add_call_info_here(_info);
 371   int jmp_off = __ offset();
 372   __ jmp(_patch_site_entry);
 373   // Add enough nops so deoptimization can overwrite the jmp above with a call
 374   // and not destroy the world.
 375   for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
 376     __ nop();
 377   }
 378   if (_id == load_klass_id) {
 379     CodeSection* cs = __ code_section();
 380     RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
 381     relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
 382   }
 383 }
 384 
 385 
 386 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
 387   __ bind(_entry);
 388   __ call(RuntimeAddress(SharedRuntime::deopt_blob()->unpack_with_reexecution()));
 389   ce->add_call_info_here(_info);
 390   debug_only(__ should_not_reach_here());
 391 }
 392 
 393 
 394 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
 395   ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
 396   __ bind(_entry);
 397   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
 398   ce->add_call_info_here(_info);
 399   debug_only(__ should_not_reach_here());
 400 }
 401 
 402 
 403 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
 404   assert(__ rsp_offset() == 0, "frame size should be fixed");
 405 
 406   __ bind(_entry);
 407   // pass the object on stack because all registers must be preserved
 408   if (_obj->is_cpu_register()) {
 409     ce->store_parameter(_obj->as_register(), 0);
 410   }
 411   __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
 412   ce->add_call_info_here(_info);
 413   debug_only(__ should_not_reach_here());
 414 }
 415 
 416 
 417 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
 418   //---------------slow case: call to native-----------------
 419   __ bind(_entry);
 420   // Figure out where the args should go
 421   // This should really convert the IntrinsicID to the methodOop and signature
 422   // but I don't know how to do that.
 423   //
 424   VMRegPair args[5];
 425   BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
 426   SharedRuntime::java_calling_convention(signature, args, 5, true);
 427 
 428   // push parameters
 429   // (src, src_pos, dest, destPos, length)
 430   Register r[5];
 431   r[0] = src()->as_register();
 432   r[1] = src_pos()->as_register();
 433   r[2] = dst()->as_register();
 434   r[3] = dst_pos()->as_register();
 435   r[4] = length()->as_register();
 436 
 437   // next registers will get stored on the stack
 438   for (int i = 0; i < 5 ; i++ ) {
 439     VMReg r_1 = args[i].first();
 440     if (r_1->is_stack()) {
 441       int st_off = r_1->reg2stack() * wordSize;
 442       __ movptr (Address(rsp, st_off), r[i]);
 443     } else {
 444       assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
 445     }
 446   }
 447 
 448   ce->align_call(lir_static_call);
 449 
 450   ce->emit_static_call_stub();
 451   AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
 452                          relocInfo::static_call_type);
 453   __ call(resolve);
 454   ce->add_call_info_here(info());
 455 
 456 #ifndef PRODUCT
 457   __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
 458 #endif
 459 
 460   __ jmp(_continuation);
 461 }
 462 
 463 /////////////////////////////////////////////////////////////////////////////
 464 #ifndef SERIALGC
 465 
 466 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
 467 
 468   // At this point we know that marking is in progress
 469 
 470   __ bind(_entry);
 471   assert(pre_val()->is_register(), "Precondition.");
 472 
 473   Register pre_val_reg = pre_val()->as_register();
 474 
 475   ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
 476 
 477   __ cmpptr(pre_val_reg, (int32_t) NULL_WORD);
 478   __ jcc(Assembler::equal, _continuation);
 479   ce->store_parameter(pre_val()->as_register(), 0);
 480   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));
 481   __ jmp(_continuation);
 482 
 483 }
 484 
 485 jbyte* G1PostBarrierStub::_byte_map_base = NULL;
 486 
 487 jbyte* G1PostBarrierStub::byte_map_base_slow() {
 488   BarrierSet* bs = Universe::heap()->barrier_set();
 489   assert(bs->is_a(BarrierSet::G1SATBCTLogging),
 490          "Must be if we're using this.");
 491   return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;
 492 }
 493 
 494 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
 495   __ bind(_entry);
 496   assert(addr()->is_register(), "Precondition.");
 497   assert(new_val()->is_register(), "Precondition.");
 498   Register new_val_reg = new_val()->as_register();
 499   __ cmpptr(new_val_reg, (int32_t) NULL_WORD);
 500   __ jcc(Assembler::equal, _continuation);
 501   ce->store_parameter(addr()->as_pointer_register(), 0);
 502   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id)));
 503   __ jmp(_continuation);
 504 }
 505 
 506 #endif // SERIALGC
 507 /////////////////////////////////////////////////////////////////////////////
 508 
 509 #undef __