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1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP |
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26 #define SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP |
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27 |
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28 #include "asm/assembler.hpp" |
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29 #include "memory/allocation.hpp" |
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30 |
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31 // All the basic framework for stubcode generation/debugging/printing. |
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32 |
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33 |
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34 // A StubCodeDesc describes a piece of generated code (usually stubs). |
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35 // This information is mainly useful for debugging and printing. |
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36 // Currently, code descriptors are simply chained in a linked list, |
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37 // this may have to change if searching becomes too slow. |
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38 |
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39 class StubCodeDesc: public CHeapObj<mtCode> { |
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40 protected: |
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41 static StubCodeDesc* _list; // the list of all descriptors |
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42 static int _count; // length of list |
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43 |
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44 StubCodeDesc* _next; // the next element in the linked list |
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45 const char* _group; // the group to which the stub code belongs |
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46 const char* _name; // the name assigned to the stub code |
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47 int _index; // serial number assigned to the stub |
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48 address _begin; // points to the first byte of the stub code (included) |
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49 address _end; // points to the first byte after the stub code (excluded) |
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50 |
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51 void set_end(address end) { |
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52 assert(_begin <= end, "begin & end not properly ordered"); |
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53 _end = end; |
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54 } |
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55 |
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56 void set_begin(address begin) { |
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57 assert(begin >= _begin, "begin may not decrease"); |
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58 assert(_end == NULL || begin <= _end, "begin & end not properly ordered"); |
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59 _begin = begin; |
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60 } |
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61 |
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62 friend class StubCodeMark; |
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63 friend class StubCodeGenerator; |
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64 |
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65 public: |
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66 static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL |
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67 static StubCodeDesc* desc_for_index(int); // returns the code descriptor for the index or NULL |
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68 static const char* name_for(address pc); // returns the name of the code containing pc or NULL |
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69 |
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70 StubCodeDesc(const char* group, const char* name, address begin) { |
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71 assert(name != NULL, "no name specified"); |
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72 _next = _list; |
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73 _group = group; |
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74 _name = name; |
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75 _index = ++_count; // (never zero) |
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76 _begin = begin; |
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77 _end = NULL; |
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78 _list = this; |
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79 }; |
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80 |
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81 const char* group() const { return _group; } |
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82 const char* name() const { return _name; } |
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83 int index() const { return _index; } |
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84 address begin() const { return _begin; } |
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85 address end() const { return _end; } |
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86 int size_in_bytes() const { return _end - _begin; } |
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87 bool contains(address pc) const { return _begin <= pc && pc < _end; } |
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88 void print_on(outputStream* st) const; |
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89 void print() const { print_on(tty); } |
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90 }; |
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91 |
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92 // The base class for all stub-generating code generators. |
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93 // Provides utility functions. |
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94 |
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95 class StubCodeGenerator: public StackObj { |
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96 protected: |
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97 MacroAssembler* _masm; |
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98 |
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99 StubCodeDesc* _first_stub; |
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100 StubCodeDesc* _last_stub; |
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101 bool _print_code; |
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102 |
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103 public: |
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104 StubCodeGenerator(CodeBuffer* code, bool print_code = false); |
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105 ~StubCodeGenerator(); |
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106 |
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107 MacroAssembler* assembler() const { return _masm; } |
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108 |
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109 virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor |
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110 virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor |
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111 }; |
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112 |
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113 |
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114 // Stack-allocated helper class used to assciate a stub code with a name. |
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115 // All stub code generating functions that use a StubCodeMark will be registered |
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116 // in the global StubCodeDesc list and the generated stub code can be identified |
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117 // later via an address pointing into it. |
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118 |
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119 class StubCodeMark: public StackObj { |
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120 protected: |
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121 StubCodeGenerator* _cgen; |
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122 StubCodeDesc* _cdesc; |
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123 |
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124 public: |
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125 StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name); |
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126 ~StubCodeMark(); |
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127 |
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128 }; |
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129 |
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130 #endif // SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP |