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1 /*
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2 * Copyright 1997-2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // All the basic framework for stubcode generation/debugging/printing.
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26
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27
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28 // A StubCodeDesc describes a piece of generated code (usually stubs).
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29 // This information is mainly useful for debugging and printing.
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30 // Currently, code descriptors are simply chained in a linked list,
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31 // this may have to change if searching becomes too slow.
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32
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33 class StubCodeDesc: public CHeapObj {
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34 protected:
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35 static StubCodeDesc* _list; // the list of all descriptors
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36 static int _count; // length of list
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37
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38 StubCodeDesc* _next; // the next element in the linked list
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39 const char* _group; // the group to which the stub code belongs
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40 const char* _name; // the name assigned to the stub code
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41 int _index; // serial number assigned to the stub
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42 address _begin; // points to the first byte of the stub code (included)
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43 address _end; // points to the first byte after the stub code (excluded)
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44
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45 void set_end(address end) {
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46 assert(_begin <= end, "begin & end not properly ordered");
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47 _end = end;
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48 }
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49
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50 void set_begin(address begin) {
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51 assert(begin >= _begin, "begin may not decrease");
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52 assert(_end == NULL || begin <= _end, "begin & end not properly ordered");
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53 _begin = begin;
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54 }
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55
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56 friend class StubCodeMark;
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57 friend class StubCodeGenerator;
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58
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59 public:
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60 static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL
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61 static StubCodeDesc* desc_for_index(int); // returns the code descriptor for the index or NULL
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62 static const char* name_for(address pc); // returns the name of the code containing pc or NULL
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63
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64 StubCodeDesc(const char* group, const char* name, address begin) {
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65 assert(name != NULL, "no name specified");
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66 _next = _list;
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67 _group = group;
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68 _name = name;
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69 _index = ++_count; // (never zero)
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70 _begin = begin;
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71 _end = NULL;
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72 _list = this;
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73 };
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74
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75 const char* group() const { return _group; }
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76 const char* name() const { return _name; }
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77 int index() const { return _index; }
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78 address begin() const { return _begin; }
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79 address end() const { return _end; }
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80 int size_in_bytes() const { return _end - _begin; }
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81 bool contains(address pc) const { return _begin <= pc && pc < _end; }
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82 void print();
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83 };
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84
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85 // The base class for all stub-generating code generators.
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86 // Provides utility functions.
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87
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88 class StubCodeGenerator: public StackObj {
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89 protected:
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90 MacroAssembler* _masm;
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91
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92 StubCodeDesc* _first_stub;
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93 StubCodeDesc* _last_stub;
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94
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95 public:
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96 StubCodeGenerator(CodeBuffer* code);
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97 ~StubCodeGenerator();
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98
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99 MacroAssembler* assembler() const { return _masm; }
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100
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101 virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor
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102 virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor
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103 };
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104
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105
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106 // Stack-allocated helper class used to assciate a stub code with a name.
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107 // All stub code generating functions that use a StubCodeMark will be registered
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108 // in the global StubCodeDesc list and the generated stub code can be identified
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109 // later via an address pointing into it.
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110
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111 class StubCodeMark: public StackObj {
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112 protected:
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113 StubCodeGenerator* _cgen;
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114 StubCodeDesc* _cdesc;
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115
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116 public:
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117 StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name);
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118 ~StubCodeMark();
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119
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120 };
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