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1 /* |
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2009 Red Hat, Inc. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 class SharkCodeBuffer : public StackObj { |
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27 public: |
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28 SharkCodeBuffer(MacroAssembler* masm) |
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29 : _masm(masm), _base_pc(NULL) {} |
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30 |
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31 private: |
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32 MacroAssembler* _masm; |
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33 llvm::Value* _base_pc; |
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34 |
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35 private: |
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36 MacroAssembler* masm() const { |
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37 return _masm; |
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38 } |
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39 |
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40 public: |
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41 llvm::Value* base_pc() const { |
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42 return _base_pc; |
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43 } |
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44 void set_base_pc(llvm::Value* base_pc) { |
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45 assert(_base_pc == NULL, "only do this once"); |
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46 _base_pc = base_pc; |
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47 } |
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48 |
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49 // Allocate some space in the buffer and return its address. |
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50 // This buffer will have been relocated by the time the method |
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51 // is installed, so you can't inline the result in code. |
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52 public: |
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53 void* malloc(size_t size) const { |
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54 masm()->align(BytesPerWord); |
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55 void *result = masm()->pc(); |
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56 masm()->advance(size); |
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57 return result; |
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58 } |
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59 |
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60 // Create a unique offset in the buffer. |
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61 public: |
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62 int create_unique_offset() const { |
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63 int offset = masm()->offset(); |
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64 masm()->advance(1); |
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65 return offset; |
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66 } |
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67 |
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68 // Inline an oop into the buffer and return its offset. |
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69 public: |
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70 int inline_oop(jobject object) const { |
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71 masm()->align(BytesPerWord); |
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72 int offset = masm()->offset(); |
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73 masm()->store_oop(object); |
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74 return offset; |
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75 } |
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76 |
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77 // Inline a block of non-oop data into the buffer and return its offset. |
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78 public: |
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79 int inline_data(void *src, size_t size) const { |
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80 masm()->align(BytesPerWord); |
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81 int offset = masm()->offset(); |
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82 void *dst = masm()->pc(); |
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83 masm()->advance(size); |
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84 memcpy(dst, src, size); |
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85 return offset; |
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86 } |
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87 }; |