1 /*

     2  * Copyright 1999-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_c1_CodeStubs_x86.cpp.incl"

    27 

    28 

    29 #define __ ce->masm()->

    30 

    31 float ConversionStub::float_zero = 0.0;

    32 double ConversionStub::double_zero = 0.0;

    33 

    34 void ConversionStub::emit_code(LIR_Assembler* ce) {

    35   __ bind(_entry);

    36   assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");

    37 

    38 

    39   if (input()->is_single_xmm()) {

    40     __ comiss(input()->as_xmm_float_reg(),

    41               ExternalAddress((address)&float_zero));

    42   } else if (input()->is_double_xmm()) {

    43     __ comisd(input()->as_xmm_double_reg(),

    44               ExternalAddress((address)&double_zero));

    45   } else {

    46     __ pushl(rax);

    47     __ ftst();

    48     __ fnstsw_ax();

    49     __ sahf();

    50     __ popl(rax);

    51   }

    52 

    53   Label NaN, do_return;

    54   __ jccb(Assembler::parity, NaN);

    55   __ jccb(Assembler::below, do_return);

    56 

    57   // input is > 0 -> return maxInt

    58   // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff

    59   __ decrement(result()->as_register());

    60   __ jmpb(do_return);

    61 

    62   // input is NaN -> return 0

    63   __ bind(NaN);

    64   __ xorl(result()->as_register(), result()->as_register());

    65 

    66   __ bind(do_return);

    67   __ jmp(_continuation);

    68 }

    69 

    70 #ifdef TIERED

    71 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {

    72   __ bind(_entry);

    73   ce->store_parameter(_bci, 0);

    74   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));

    75   ce->add_call_info_here(_info);

    76   ce->verify_oop_map(_info);

    77 

    78   __ jmp(_continuation);

    79 }

    80 #endif // TIERED

    81 

    82 

    83 

    84 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,

    85                                bool throw_index_out_of_bounds_exception)

    86   : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)

    87   , _index(index)

    88 {

    89   _info = info == NULL ? NULL : new CodeEmitInfo(info);

    90 }

    91 

    92 

    93 void RangeCheckStub::emit_code(LIR_Assembler* ce) {

    94   __ bind(_entry);

    95   // pass the array index on stack because all registers must be preserved

    96   if (_index->is_cpu_register()) {

    97     ce->store_parameter(_index->as_register(), 0);

    98   } else {

    99     ce->store_parameter(_index->as_jint(), 0);

   100   }

   101   Runtime1::StubID stub_id;

   102   if (_throw_index_out_of_bounds_exception) {

   103     stub_id = Runtime1::throw_index_exception_id;

   104   } else {

   105     stub_id = Runtime1::throw_range_check_failed_id;

   106   }

   107   __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));

   108   ce->add_call_info_here(_info);

   109   debug_only(__ should_not_reach_here());

   110 }

   111 

   112 

   113 void DivByZeroStub::emit_code(LIR_Assembler* ce) {

   114   if (_offset != -1) {

   115     ce->compilation()->implicit_exception_table()->append(_offset, __ offset());

   116   }

   117   __ bind(_entry);

   118   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));

   119   ce->add_call_info_here(_info);

   120   debug_only(__ should_not_reach_here());

   121 }

   122 

   123 

   124 // Implementation of NewInstanceStub

   125 

   126 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {

   127   _result = result;

   128   _klass = klass;

   129   _klass_reg = klass_reg;

   130   _info = new CodeEmitInfo(info);

   131   assert(stub_id == Runtime1::new_instance_id                 ||

   132          stub_id == Runtime1::fast_new_instance_id            ||

   133          stub_id == Runtime1::fast_new_instance_init_check_id,

   134          "need new_instance id");

   135   _stub_id   = stub_id;

   136 }

   137 

   138 

   139 void NewInstanceStub::emit_code(LIR_Assembler* ce) {

   140   assert(__ rsp_offset() == 0, "frame size should be fixed");

   141   __ bind(_entry);

   142   __ movl(rdx, _klass_reg->as_register());

   143   __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));

   144   ce->add_call_info_here(_info);

   145   ce->verify_oop_map(_info);

   146   assert(_result->as_register() == rax, "result must in rax,");

   147   __ jmp(_continuation);

   148 }

   149 

   150 

   151 // Implementation of NewTypeArrayStub

   152 

   153 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {

   154   _klass_reg = klass_reg;

   155   _length = length;

   156   _result = result;

   157   _info = new CodeEmitInfo(info);

   158 }

   159 

   160 

   161 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {

   162   assert(__ rsp_offset() == 0, "frame size should be fixed");

   163   __ bind(_entry);

   164   assert(_length->as_register() == rbx, "length must in rbx,");

   165   assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");

   166   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));

   167   ce->add_call_info_here(_info);

   168   ce->verify_oop_map(_info);

   169   assert(_result->as_register() == rax, "result must in rax,");

   170   __ jmp(_continuation);

   171 }

   172 

   173 

   174 // Implementation of NewObjectArrayStub

   175 

   176 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {

   177   _klass_reg = klass_reg;

   178   _result = result;

   179   _length = length;

   180   _info = new CodeEmitInfo(info);

   181 }

   182 

   183 

   184 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {

   185   assert(__ rsp_offset() == 0, "frame size should be fixed");

   186   __ bind(_entry);

   187   assert(_length->as_register() == rbx, "length must in rbx,");

   188   assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");

   189   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));

   190   ce->add_call_info_here(_info);

   191   ce->verify_oop_map(_info);

   192   assert(_result->as_register() == rax, "result must in rax,");

   193   __ jmp(_continuation);

   194 }

   195 

   196 

   197 // Implementation of MonitorAccessStubs

   198 

   199 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)

   200 : MonitorAccessStub(obj_reg, lock_reg)

   201 {

   202   _info = new CodeEmitInfo(info);

   203 }

   204 

   205 

   206 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {

   207   assert(__ rsp_offset() == 0, "frame size should be fixed");

   208   __ bind(_entry);

   209   ce->store_parameter(_obj_reg->as_register(),  1);

   210   ce->store_parameter(_lock_reg->as_register(), 0);

   211   Runtime1::StubID enter_id;

   212   if (ce->compilation()->has_fpu_code()) {

   213     enter_id = Runtime1::monitorenter_id;

   214   } else {

   215     enter_id = Runtime1::monitorenter_nofpu_id;

   216   }

   217   __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));

   218   ce->add_call_info_here(_info);

   219   ce->verify_oop_map(_info);

   220   __ jmp(_continuation);

   221 }

   222 

   223 

   224 void MonitorExitStub::emit_code(LIR_Assembler* ce) {

   225   __ bind(_entry);

   226   if (_compute_lock) {

   227     // lock_reg was destroyed by fast unlocking attempt => recompute it

   228     ce->monitor_address(_monitor_ix, _lock_reg);

   229   }

   230   ce->store_parameter(_lock_reg->as_register(), 0);

   231   // note: non-blocking leaf routine => no call info needed

   232   Runtime1::StubID exit_id;

   233   if (ce->compilation()->has_fpu_code()) {

   234     exit_id = Runtime1::monitorexit_id;

   235   } else {

   236     exit_id = Runtime1::monitorexit_nofpu_id;

   237   }

   238   __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));

   239   __ jmp(_continuation);

   240 }

   241 

   242 

   243 // Implementation of patching:

   244 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)

   245 // - Replace original code with a call to the stub

   246 // At Runtime:

   247 // - call to stub, jump to runtime

   248 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)

   249 // - in runtime: after initializing class, restore original code, reexecute instruction

   250 

   251 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;

   252 

   253 void PatchingStub::align_patch_site(MacroAssembler* masm) {

   254   // We're patching a 5-7 byte instruction on intel and we need to

   255   // make sure that we don't see a piece of the instruction.  It

   256   // appears mostly impossible on Intel to simply invalidate other

   257   // processors caches and since they may do aggressive prefetch it's

   258   // very hard to make a guess about what code might be in the icache.

   259   // Force the instruction to be double word aligned so that it

   260   // doesn't span a cache line.

   261   masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));

   262 }

   263 

   264 void PatchingStub::emit_code(LIR_Assembler* ce) {

   265   assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");

   266 

   267   Label call_patch;

   268 

   269   // static field accesses have special semantics while the class

   270   // initializer is being run so we emit a test which can be used to

   271   // check that this code is being executed by the initializing

   272   // thread.

   273   address being_initialized_entry = __ pc();

   274   if (CommentedAssembly) {

   275     __ block_comment(" patch template");

   276   }

   277   if (_id == load_klass_id) {

   278     // produce a copy of the load klass instruction for use by the being initialized case

   279     address start = __ pc();

   280     jobject o = NULL;

   281     __ movoop(_obj, o);

   282 #ifdef ASSERT

   283     for (int i = 0; i < _bytes_to_copy; i++) {

   284       address ptr = (address)(_pc_start + i);

   285       int a_byte = (*ptr) & 0xFF;

   286       assert(a_byte == *start++, "should be the same code");

   287     }

   288 #endif

   289   } else {

   290     // make a copy the code which is going to be patched.

   291     for ( int i = 0; i < _bytes_to_copy; i++) {

   292       address ptr = (address)(_pc_start + i);

   293       int a_byte = (*ptr) & 0xFF;

   294       __ a_byte (a_byte);

   295       *ptr = 0x90; // make the site look like a nop

   296     }

   297   }

   298 

   299   address end_of_patch = __ pc();

   300   int bytes_to_skip = 0;

   301   if (_id == load_klass_id) {

   302     int offset = __ offset();

   303     if (CommentedAssembly) {

   304       __ block_comment(" being_initialized check");

   305     }

   306     assert(_obj != noreg, "must be a valid register");

   307     Register tmp = rax;

   308     if (_obj == tmp) tmp = rbx;

   309     __ pushl(tmp);

   310     __ get_thread(tmp);

   311     __ cmpl(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));

   312     __ popl(tmp);

   313     __ jcc(Assembler::notEqual, call_patch);

   314 

   315     // access_field patches may execute the patched code before it's

   316     // copied back into place so we need to jump back into the main

   317     // code of the nmethod to continue execution.

   318     __ jmp(_patch_site_continuation);

   319 

   320     // make sure this extra code gets skipped

   321     bytes_to_skip += __ offset() - offset;

   322   }

   323   if (CommentedAssembly) {

   324     __ block_comment("patch data encoded as movl");

   325   }

   326   // Now emit the patch record telling the runtime how to find the

   327   // pieces of the patch.  We only need 3 bytes but for readability of

   328   // the disassembly we make the data look like a movl reg, imm32,

   329   // which requires 5 bytes

   330   int sizeof_patch_record = 5;

   331   bytes_to_skip += sizeof_patch_record;

   332 

   333   // emit the offsets needed to find the code to patch

   334   int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;

   335 

   336   __ a_byte(0xB8);

   337   __ a_byte(0);

   338   __ a_byte(being_initialized_entry_offset);

   339   __ a_byte(bytes_to_skip);

   340   __ a_byte(_bytes_to_copy);

   341   address patch_info_pc = __ pc();

   342   assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");

   343 

   344   address entry = __ pc();

   345   NativeGeneralJump::insert_unconditional((address)_pc_start, entry);

   346   address target = NULL;

   347   switch (_id) {

   348     case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;

   349     case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;

   350     default: ShouldNotReachHere();

   351   }

   352   __ bind(call_patch);

   353 

   354   if (CommentedAssembly) {

   355     __ block_comment("patch entry point");

   356   }

   357   __ call(RuntimeAddress(target));

   358   assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");

   359   ce->add_call_info_here(_info);

   360   int jmp_off = __ offset();

   361   __ jmp(_patch_site_entry);

   362   // Add enough nops so deoptimization can overwrite the jmp above with a call

   363   // and not destroy the world.

   364   for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {

   365     __ nop();

   366   }

   367   if (_id == load_klass_id) {

   368     CodeSection* cs = __ code_section();

   369     RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));

   370     relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);

   371   }

   372 }

   373 

   374 

   375 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {

   376   ce->compilation()->implicit_exception_table()->append(_offset, __ offset());

   377   __ bind(_entry);

   378   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));

   379   ce->add_call_info_here(_info);

   380   debug_only(__ should_not_reach_here());

   381 }

   382 

   383 

   384 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {

   385   assert(__ rsp_offset() == 0, "frame size should be fixed");

   386 

   387   __ bind(_entry);

   388   // pass the object on stack because all registers must be preserved

   389   if (_obj->is_cpu_register()) {

   390     ce->store_parameter(_obj->as_register(), 0);

   391   }

   392   __ call(RuntimeAddress(Runtime1::entry_for(_stub)));

   393   ce->add_call_info_here(_info);

   394   debug_only(__ should_not_reach_here());

   395 }

   396 

   397 

   398 ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info):

   399   _info(info) {

   400 }

   401 

   402 

   403 void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) {

   404   assert(__ rsp_offset() == 0, "frame size should be fixed");

   405   __ bind(_entry);

   406   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id)));

   407   ce->add_call_info_here(_info);

   408   debug_only(__ should_not_reach_here());

   409 }

   410 

   411 

   412 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {

   413   //---------------slow case: call to native-----------------

   414   __ bind(_entry);

   415   // Figure out where the args should go

   416   // This should really convert the IntrinsicID to the methodOop and signature

   417   // but I don't know how to do that.

   418   //

   419   VMRegPair args[5];

   420   BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};

   421   SharedRuntime::java_calling_convention(signature, args, 5, true);

   422 

   423   // push parameters

   424   // (src, src_pos, dest, destPos, length)

   425   Register r[5];

   426   r[0] = src()->as_register();

   427   r[1] = src_pos()->as_register();

   428   r[2] = dst()->as_register();

   429   r[3] = dst_pos()->as_register();

   430   r[4] = length()->as_register();

   431 

   432   // next registers will get stored on the stack

   433   for (int i = 0; i < 5 ; i++ ) {

   434     VMReg r_1 = args[i].first();

   435     if (r_1->is_stack()) {

   436       int st_off = r_1->reg2stack() * wordSize;

   437       __ movl (Address(rsp, st_off), r[i]);

   438     } else {

   439       assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");

   440     }

   441   }

   442 

   443   ce->align_call(lir_static_call);

   444 

   445   ce->emit_static_call_stub();

   446   AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),

   447                          relocInfo::static_call_type);

   448   __ call(resolve);

   449   ce->add_call_info_here(info());

   450 

   451 #ifndef PRODUCT

   452   __ increment(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));

   453 #endif

   454 

   455   __ jmp(_continuation);

   456 }

   457 

   458 

   459 #undef __