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