1 /*

     2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * Copyright 2009 Red Hat, Inc.

     4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     5  *

     6  * This code is free software; you can redistribute it and/or modify it

     7  * under the terms of the GNU General Public License version 2 only, as

     8  * published by the Free Software Foundation.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  *

    24  */

    25 

    26 #ifndef SHARE_VM_SHARK_SHARKCODEBUFFER_HPP

    27 #define SHARE_VM_SHARK_SHARKCODEBUFFER_HPP

    28 

    29 #include "asm/codeBuffer.hpp"

    30 #include "memory/allocation.hpp"

    31 #include "shark/llvmHeaders.hpp"

    32 

    33 class SharkCodeBuffer : public StackObj {

    34  public:

    35   SharkCodeBuffer(MacroAssembler* masm)

    36     : _masm(masm), _base_pc(NULL) {}

    37 

    38  private:

    39   MacroAssembler* _masm;

    40   llvm::Value*    _base_pc;

    41 

    42  private:

    43   MacroAssembler* masm() const {

    44     return _masm;

    45   }

    46 

    47  public:

    48   llvm::Value* base_pc() const {

    49     return _base_pc;

    50   }

    51   void set_base_pc(llvm::Value* base_pc) {

    52     assert(_base_pc == NULL, "only do this once");

    53     _base_pc = base_pc;

    54   }

    55 

    56   // Allocate some space in the buffer and return its address.

    57   // This buffer will have been relocated by the time the method

    58   // is installed, so you can't inline the result in code.

    59  public:

    60   void* malloc(size_t size) const {

    61     masm()->align(BytesPerWord);

    62     void *result = masm()->pc();

    63     masm()->advance(size);

    64     return result;

    65   }

    66 

    67   // Create a unique offset in the buffer.

    68  public:

    69   int create_unique_offset() const {

    70     int offset = masm()->offset();

    71     masm()->advance(1);

    72     return offset;

    73   }

    74 

    75   // Inline an oop into the buffer and return its offset.

    76  public:

    77   int inline_oop(jobject object) const {

    78     masm()->align(BytesPerWord);

    79     int offset = masm()->offset();

    80     masm()->store_oop(object);

    81     return offset;

    82   }

    83 

    84   int inline_Metadata(Metadata* metadata) const {

    85     masm()->align(BytesPerWord);

    86     int offset = masm()->offset();

    87     masm()->store_Metadata(metadata);

    88     return offset;

    89   }

    90 

    91   // Inline a block of non-oop data into the buffer and return its offset.

    92  public:

    93   int inline_data(void *src, size_t size) const {

    94     masm()->align(BytesPerWord);

    95     int offset = masm()->offset();

    96     void *dst = masm()->pc();

    97     masm()->advance(size);

    98     memcpy(dst, src, size);

    99     return offset;

   100   }

   101 };

   102 

   103 #endif // SHARE_VM_SHARK_SHARKCODEBUFFER_HPP