1 /*

     2  * Copyright (c) 2018, 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 #ifndef SHARE_GC_G1_C1_G1BARRIERSETC1_HPP

    26 #define SHARE_GC_G1_C1_G1BARRIERSETC1_HPP

    27 

    28 #include "c1/c1_CodeStubs.hpp"

    29 #include "gc/shared/c1/modRefBarrierSetC1.hpp"

    30 

    31 class G1PreBarrierStub: public CodeStub {

    32   friend class G1BarrierSetC1;

    33  private:

    34   bool _do_load;

    35   LIR_Opr _addr;

    36   LIR_Opr _pre_val;

    37   LIR_PatchCode _patch_code;

    38   CodeEmitInfo* _info;

    39 

    40  public:

    41   // Version that _does_ generate a load of the previous value from addr.

    42   // addr (the address of the field to be read) must be a LIR_Address

    43   // pre_val (a temporary register) must be a register;

    44   G1PreBarrierStub(LIR_Opr addr, LIR_Opr pre_val, LIR_PatchCode patch_code, CodeEmitInfo* info) :

    45     _addr(addr), _pre_val(pre_val), _do_load(true),

    46     _patch_code(patch_code), _info(info)

    47   {

    48     assert(_pre_val->is_register(), "should be temporary register");

    49     assert(_addr->is_address(), "should be the address of the field");

    50   }

    51 

    52   // Version that _does not_ generate load of the previous value; the

    53   // previous value is assumed to have already been loaded into pre_val.

    54   G1PreBarrierStub(LIR_Opr pre_val) :

    55     _addr(LIR_OprFact::illegalOpr), _pre_val(pre_val), _do_load(false),

    56     _patch_code(lir_patch_none), _info(NULL)

    57   {

    58     assert(_pre_val->is_register(), "should be a register");

    59   }

    60 

    61   LIR_Opr addr() const { return _addr; }

    62   LIR_Opr pre_val() const { return _pre_val; }

    63   LIR_PatchCode patch_code() const { return _patch_code; }

    64   CodeEmitInfo* info() const { return _info; }

    65   bool do_load() const { return _do_load; }

    66 

    67   virtual void emit_code(LIR_Assembler* e);

    68   virtual void visit(LIR_OpVisitState* visitor) {

    69     if (_do_load) {

    70       // don't pass in the code emit info since it's processed in the fast

    71       // path

    72       if (_info != NULL)

    73         visitor->do_slow_case(_info);

    74       else

    75         visitor->do_slow_case();

    76 

    77       visitor->do_input(_addr);

    78       visitor->do_temp(_pre_val);

    79     } else {

    80       visitor->do_slow_case();

    81       visitor->do_input(_pre_val);

    82     }

    83   }

    84 #ifndef PRODUCT

    85   virtual void print_name(outputStream* out) const { out->print("G1PreBarrierStub"); }

    86 #endif // PRODUCT

    87 };

    88 

    89 class G1PostBarrierStub: public CodeStub {

    90   friend class G1BarrierSetC1;

    91  private:

    92   LIR_Opr _addr;

    93   LIR_Opr _new_val;

    94 

    95  public:

    96   // addr (the address of the object head) and new_val must be registers.

    97   G1PostBarrierStub(LIR_Opr addr, LIR_Opr new_val): _addr(addr), _new_val(new_val) { }

    98 

    99   LIR_Opr addr() const { return _addr; }

   100   LIR_Opr new_val() const { return _new_val; }

   101 

   102   virtual void emit_code(LIR_Assembler* e);

   103   virtual void visit(LIR_OpVisitState* visitor) {

   104     // don't pass in the code emit info since it's processed in the fast path

   105     visitor->do_slow_case();

   106     visitor->do_input(_addr);

   107     visitor->do_input(_new_val);

   108   }

   109 #ifndef PRODUCT

   110   virtual void print_name(outputStream* out) const { out->print("G1PostBarrierStub"); }

   111 #endif // PRODUCT

   112 };

   113 

   114 class CodeBlob;

   115 

   116 class G1BarrierSetC1 : public ModRefBarrierSetC1 {

   117  protected:

   118   CodeBlob* _pre_barrier_c1_runtime_code_blob;

   119   CodeBlob* _post_barrier_c1_runtime_code_blob;

   120 

   121   virtual void pre_barrier(LIRAccess& access, LIR_Opr addr_opr,

   122                            LIR_Opr pre_val, CodeEmitInfo* info);

   123   virtual void post_barrier(LIRAccess& access, LIR_OprDesc* addr, LIR_OprDesc* new_val);

   124 

   125   virtual void load_at_resolved(LIRAccess& access, LIR_Opr result);

   126 

   127  public:

   128   G1BarrierSetC1()

   129     : _pre_barrier_c1_runtime_code_blob(NULL),

   130       _post_barrier_c1_runtime_code_blob(NULL) {}

   131 

   132   CodeBlob* pre_barrier_c1_runtime_code_blob() { return _pre_barrier_c1_runtime_code_blob; }

   133   CodeBlob* post_barrier_c1_runtime_code_blob() { return _post_barrier_c1_runtime_code_blob; }

   134 

   135   virtual void generate_c1_runtime_stubs(BufferBlob* buffer_blob);

   136 };

   137 

   138 #endif // SHARE_GC_G1_C1_G1BARRIERSETC1_HPP