annotate src/share/vm/runtime/stubCodeGenerator.hpp @ 2368:dde920245681

6896099: Integrate CMS heap ergo with default heap sizing ergo 6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m 7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification 7027529: CMS: retire CMSUseOldDefaults flag Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago. Reviewed-by: brutisso, poonam
author ysr
date Wed, 16 Mar 2011 10:37:08 -0700
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children a9b8b43b115f
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1 /*
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2 * Copyright (c) 1997, 2010, 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 {
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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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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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102 public:
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103 StubCodeGenerator(CodeBuffer* code);
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104 ~StubCodeGenerator();
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105
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106 MacroAssembler* assembler() const { return _masm; }
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107
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108 virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor
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109 virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor
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110 };
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111
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113 // Stack-allocated helper class used to assciate a stub code with a name.
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114 // All stub code generating functions that use a StubCodeMark will be registered
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115 // in the global StubCodeDesc list and the generated stub code can be identified
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116 // later via an address pointing into it.
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117
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118 class StubCodeMark: public StackObj {
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119 protected:
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120 StubCodeGenerator* _cgen;
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121 StubCodeDesc* _cdesc;
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122
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123 public:
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124 StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name);
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125 ~StubCodeMark();
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126
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127 };
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128
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129 #endif // SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP