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annotate src/share/vm/runtime/handles.hpp @ 18096:ca6d25be853b jdk8u25-b13

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8044269: Analysis of archive files. Summary: Add checksum verification. Reviewed-by: iklam, dholmes, mschoene
author jiangli
date Tue, 12 Aug 2014 17:46:16 -0400
parents 4f9a42c33738
children 63a4eb8bcd23 833b0f92429a
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1 /*
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2 * Copyright (c) 1997, 2013, 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_HANDLES_HPP
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26 #define SHARE_VM_RUNTIME_HANDLES_HPP
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27
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28 #include "oops/klass.hpp"
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29
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30 //------------------------------------------------------------------------------------------------------------------------
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31 // In order to preserve oops during garbage collection, they should be
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32 // allocated and passed around via Handles within the VM. A handle is
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33 // simply an extra indirection allocated in a thread local handle area.
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34 //
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35 // A handle is a ValueObj, so it can be passed around as a value, can
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36 // be used as a parameter w/o using &-passing, and can be returned as a
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37 // return value.
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38 //
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39 // oop parameters and return types should be Handles whenever feasible.
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40 //
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41 // Handles are declared in a straight-forward manner, e.g.
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42 //
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43 // oop obj = ...;
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44 // Handle h1(obj); // allocate new handle
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45 // Handle h2(thread, obj); // faster allocation when current thread is known
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46 // Handle h3; // declare handle only, no allocation occurs
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47 // ...
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48 // h3 = h1; // make h3 refer to same indirection as h1
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49 // oop obj2 = h2(); // get handle value
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50 // h1->print(); // invoking operation on oop
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51 //
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52 // Handles are specialized for different oop types to provide extra type
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53 // information and avoid unnecessary casting. For each oop type xxxOop
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54 // there is a corresponding handle called xxxHandle, e.g.
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55 //
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56 // oop Handle
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57 // Method* methodHandle
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58 // instanceOop instanceHandle
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59
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60 //------------------------------------------------------------------------------------------------------------------------
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61 // Base class for all handles. Provides overloading of frequently
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62 // used operators for ease of use.
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63
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64 class Handle VALUE_OBJ_CLASS_SPEC {
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65 private:
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66 oop* _handle;
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67
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68 protected:
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69 oop obj() const { return _handle == NULL ? (oop)NULL : *_handle; }
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70 oop non_null_obj() const { assert(_handle != NULL, "resolving NULL handle"); return *_handle; }
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71
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72 public:
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73 // Constructors
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74 Handle() { _handle = NULL; }
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75 Handle(oop obj);
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76 Handle(Thread* thread, oop obj);
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77
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78 // General access
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79 oop operator () () const { return obj(); }
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80 oop operator -> () const { return non_null_obj(); }
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81 bool operator == (oop o) const { return obj() == o; }
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82 bool operator == (const Handle& h) const { return obj() == h.obj(); }
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83
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84 // Null checks
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85 bool is_null() const { return _handle == NULL; }
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86 bool not_null() const { return _handle != NULL; }
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87
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88 // Debugging
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89 void print() { obj()->print(); }
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90
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91 // Direct interface, use very sparingly.
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92 // Used by JavaCalls to quickly convert handles and to create handles static data structures.
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93 // Constructor takes a dummy argument to prevent unintentional type conversion in C++.
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94 Handle(oop *handle, bool dummy) { _handle = handle; }
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95
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96 // Raw handle access. Allows easy duplication of Handles. This can be very unsafe
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97 // since duplicates is only valid as long as original handle is alive.
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98 oop* raw_value() { return _handle; }
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99 static oop raw_resolve(oop *handle) { return handle == NULL ? (oop)NULL : *handle; }
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100 };
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101
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102 // Specific Handles for different oop types
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103 #define DEF_HANDLE(type, is_a) \
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104 class type##Handle: public Handle { \
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105 protected: \
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106 type##Oop obj() const { return (type##Oop)Handle::obj(); } \
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107 type##Oop non_null_obj() const { return (type##Oop)Handle::non_null_obj(); } \
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108 \
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109 public: \
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110 /* Constructors */ \
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111 type##Handle () : Handle() {} \
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112 type##Handle (type##Oop obj) : Handle((oop)obj) { \
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113 assert(is_null() || ((oop)obj)->is_a(), \
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114 "illegal type"); \
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115 } \
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116 type##Handle (Thread* thread, type##Oop obj) : Handle(thread, (oop)obj) { \
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117 assert(is_null() || ((oop)obj)->is_a(), "illegal type"); \
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118 } \
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119 \
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120 /* Operators for ease of use */ \
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121 type##Oop operator () () const { return obj(); } \
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122 type##Oop operator -> () const { return non_null_obj(); } \
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123 };
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124
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125
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126 DEF_HANDLE(instance , is_instance )
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127 DEF_HANDLE(array , is_array )
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128 DEF_HANDLE(objArray , is_objArray )
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129 DEF_HANDLE(typeArray , is_typeArray )
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130
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131 //------------------------------------------------------------------------------------------------------------------------
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132
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133 // Metadata Handles. Unlike oop Handles these are needed to prevent metadata
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134 // from being reclaimed by RedefineClasses.
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135
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136 // Specific Handles for different oop types
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137 #define DEF_METADATA_HANDLE(name, type) \
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138 class name##Handle; \
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139 class name##Handle : public StackObj { \
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140 type* _value; \
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141 Thread* _thread; \
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142 protected: \
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143 type* obj() const { return _value; } \
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144 type* non_null_obj() const { assert(_value != NULL, "resolving NULL _value"); return _value; } \
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145 \
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146 public: \
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147 /* Constructors */ \
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148 name##Handle () : _value(NULL), _thread(NULL) {} \
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149 name##Handle (type* obj); \
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150 name##Handle (Thread* thread, type* obj); \
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151 \
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152 name##Handle (const name##Handle &h); \
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153 name##Handle& operator=(const name##Handle &s); \
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154 \
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155 /* Destructor */ \
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156 ~name##Handle (); \
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157 void remove(); \
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158 \
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159 /* Operators for ease of use */ \
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160 type* operator () () const { return obj(); } \
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161 type* operator -> () const { return non_null_obj(); } \
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162 \
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163 bool operator == (type* o) const { return obj() == o; } \
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164 bool operator == (const name##Handle& h) const { return obj() == h.obj(); } \
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165 \
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166 /* Null checks */ \
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167 bool is_null() const { return _value == NULL; } \
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168 bool not_null() const { return _value != NULL; } \
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169 };
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170
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171
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172 DEF_METADATA_HANDLE(method, Method)
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173 DEF_METADATA_HANDLE(constantPool, ConstantPool)
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174
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175 // Writing this class explicitly, since DEF_METADATA_HANDLE(klass) doesn't
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176 // provide the necessary Klass* <-> Klass* conversions. This Klass
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177 // could be removed when we don't have the Klass* typedef anymore.
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178 class KlassHandle : public StackObj {
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179 Klass* _value;
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180 protected:
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181 Klass* obj() const { return _value; }
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182 Klass* non_null_obj() const { assert(_value != NULL, "resolving NULL _value"); return _value; }
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183
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184 public:
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185 KlassHandle() : _value(NULL) {}
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186 KlassHandle(const Klass* obj) : _value(const_cast<Klass *>(obj)) {};
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187 KlassHandle(Thread* thread, const Klass* obj) : _value(const_cast<Klass *>(obj)) {};
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188
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189 Klass* operator () () const { return obj(); }
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190 Klass* operator -> () const { return non_null_obj(); }
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191
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192 bool operator == (Klass* o) const { return obj() == o; }
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193 bool operator == (const KlassHandle& h) const { return obj() == h.obj(); }
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194
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195 bool is_null() const { return _value == NULL; }
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196 bool not_null() const { return _value != NULL; }
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197 };
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198
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199 class instanceKlassHandle : public KlassHandle {
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200 public:
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201 /* Constructors */
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202 instanceKlassHandle () : KlassHandle() {}
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203 instanceKlassHandle (const Klass* k) : KlassHandle(k) {
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204 assert(k == NULL || k->oop_is_instance(),
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205 "illegal type");
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206 }
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207 instanceKlassHandle (Thread* thread, const Klass* k) : KlassHandle(thread, k) {
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208 assert(k == NULL || k->oop_is_instance(),
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209 "illegal type");
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210 }
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211 /* Access to klass part */
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212 InstanceKlass* operator () () const { return (InstanceKlass*)obj(); }
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213 InstanceKlass* operator -> () const { return (InstanceKlass*)obj(); }
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214 };
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215
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216
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217 //------------------------------------------------------------------------------------------------------------------------
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218 // Thread local handle area
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219 class HandleArea: public Arena {
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220 friend class HandleMark;
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221 friend class NoHandleMark;
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222 friend class ResetNoHandleMark;
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223 #ifdef ASSERT
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224 int _handle_mark_nesting;
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225 int _no_handle_mark_nesting;
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226 #endif
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227 HandleArea* _prev; // link to outer (older) area
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228 public:
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229 // Constructor
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230 HandleArea(HandleArea* prev) : Arena(Chunk::tiny_size) {
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231 debug_only(_handle_mark_nesting = 0);
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232 debug_only(_no_handle_mark_nesting = 0);
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233 _prev = prev;
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234 }
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235
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236 // Handle allocation
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237 private:
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238 oop* real_allocate_handle(oop obj) {
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239 #ifdef ASSERT
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240 oop* handle = (oop*) (UseMallocOnly ? internal_malloc_4(oopSize) : Amalloc_4(oopSize));
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241 #else
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242 oop* handle = (oop*) Amalloc_4(oopSize);
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243 #endif
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244 *handle = obj;
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245 return handle;
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246 }
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247 public:
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248 #ifdef ASSERT
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249 oop* allocate_handle(oop obj);
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250 #else
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251 oop* allocate_handle(oop obj) { return real_allocate_handle(obj); }
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252 #endif
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253
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254 // Garbage collection support
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255 void oops_do(OopClosure* f);
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256
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257 // Number of handles in use
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258 size_t used() const { return Arena::used() / oopSize; }
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259
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260 debug_only(bool no_handle_mark_active() { return _no_handle_mark_nesting > 0; })
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261 };
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262
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263
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264 //------------------------------------------------------------------------------------------------------------------------
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265 // Handles are allocated in a (growable) thread local handle area. Deallocation
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266 // is managed using a HandleMark. It should normally not be necessary to use
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267 // HandleMarks manually.
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268 //
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269 // A HandleMark constructor will record the current handle area top, and the
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270 // desctructor will reset the top, destroying all handles allocated in between.
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271 // The following code will therefore NOT work:
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272 //
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273 // Handle h;
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274 // {
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275 // HandleMark hm;
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276 // h = Handle(obj);
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277 // }
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278 // h()->print(); // WRONG, h destroyed by HandleMark destructor.
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279 //
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280 // If h has to be preserved, it can be converted to an oop or a local JNI handle
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281 // across the HandleMark boundary.
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282
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283 // The base class of HandleMark should have been StackObj but we also heap allocate
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284 // a HandleMark when a thread is created. The operator new is for this special case.
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285
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286 class HandleMark {
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287 private:
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288 Thread *_thread; // thread that owns this mark
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289 HandleArea *_area; // saved handle area
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290 Chunk *_chunk; // saved arena chunk
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291 char *_hwm, *_max; // saved arena info
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292 size_t _size_in_bytes; // size of handle area
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293 // Link to previous active HandleMark in thread
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294 HandleMark* _previous_handle_mark;
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295
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296 void initialize(Thread* thread); // common code for constructors
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297 void set_previous_handle_mark(HandleMark* mark) { _previous_handle_mark = mark; }
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298 HandleMark* previous_handle_mark() const { return _previous_handle_mark; }
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299
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300 size_t size_in_bytes() const { return _size_in_bytes; }
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301 public:
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302 HandleMark(); // see handles_inline.hpp
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303 HandleMark(Thread* thread) { initialize(thread); }
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304 ~HandleMark();
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305
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306 // Functions used by HandleMarkCleaner
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307 // called in the constructor of HandleMarkCleaner
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308 void push();
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309 // called in the destructor of HandleMarkCleaner
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310 void pop_and_restore();
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311 // overloaded operators
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312 void* operator new(size_t size) throw();
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313 void* operator new [](size_t size) throw();
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314 void operator delete(void* p);
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315 void operator delete[](void* p);
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316 };
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317
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318 //------------------------------------------------------------------------------------------------------------------------
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319 // A NoHandleMark stack object will verify that no handles are allocated
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320 // in its scope. Enabled in debug mode only.
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321
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322 class NoHandleMark: public StackObj {
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323 public:
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324 #ifdef ASSERT
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325 NoHandleMark();
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326 ~NoHandleMark();
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327 #else
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328 NoHandleMark() {}
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329 ~NoHandleMark() {}
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330 #endif
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331 };
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332
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333
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334 class ResetNoHandleMark: public StackObj {
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335 int _no_handle_mark_nesting;
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336 public:
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337 #ifdef ASSERT
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338 ResetNoHandleMark();
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339 ~ResetNoHandleMark();
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340 #else
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341 ResetNoHandleMark() {}
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342 ~ResetNoHandleMark() {}
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343 #endif
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344 };
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345
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346 #endif // SHARE_VM_RUNTIME_HANDLES_HPP