hotspot/src/share/vm/shark/sharkCodeBuffer.hpp
changeset 6187 4fa7845f7c14
child 7397 5b173b4ca846
equal deleted inserted replaced
6186:7eef4cda471c 6187:4fa7845f7c14
       
     1 /*
       
     2  * Copyright (c) 1999, 2007, 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 class SharkCodeBuffer : public StackObj {
       
    27  public:
       
    28   SharkCodeBuffer(MacroAssembler* masm)
       
    29     : _masm(masm), _base_pc(NULL) {}
       
    30 
       
    31  private:
       
    32   MacroAssembler* _masm;
       
    33   llvm::Value*    _base_pc;
       
    34 
       
    35  private:
       
    36   MacroAssembler* masm() const {
       
    37     return _masm;
       
    38   }
       
    39 
       
    40  public:
       
    41   llvm::Value* base_pc() const {
       
    42     return _base_pc;
       
    43   }
       
    44   void set_base_pc(llvm::Value* base_pc) {
       
    45     assert(_base_pc == NULL, "only do this once");
       
    46     _base_pc = base_pc;
       
    47   }
       
    48 
       
    49   // Allocate some space in the buffer and return its address.
       
    50   // This buffer will have been relocated by the time the method
       
    51   // is installed, so you can't inline the result in code.
       
    52  public:
       
    53   void* malloc(size_t size) const {
       
    54     masm()->align(BytesPerWord);
       
    55     void *result = masm()->pc();
       
    56     masm()->advance(size);
       
    57     return result;
       
    58   }
       
    59 
       
    60   // Create a unique offset in the buffer.
       
    61  public:
       
    62   int create_unique_offset() const {
       
    63     int offset = masm()->offset();
       
    64     masm()->advance(1);
       
    65     return offset;
       
    66   }
       
    67 
       
    68   // Inline an oop into the buffer and return its offset.
       
    69  public:
       
    70   int inline_oop(jobject object) const {
       
    71     masm()->align(BytesPerWord);
       
    72     int offset = masm()->offset();
       
    73     masm()->store_oop(object);
       
    74     return offset;
       
    75   }
       
    76 
       
    77   // Inline a block of non-oop data into the buffer and return its offset.
       
    78  public:
       
    79   int inline_data(void *src, size_t size) const {
       
    80     masm()->align(BytesPerWord);
       
    81     int offset = masm()->offset();
       
    82     void *dst = masm()->pc();
       
    83     masm()->advance(size);
       
    84     memcpy(dst, src, size);
       
    85     return offset;
       
    86   }
       
    87 };