Mercurial > hg > graal-compiler
annotate src/share/vm/oops/symbol.hpp @ 10179:a08c80e9e1e5
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Reviewed-by: tschatzl, jmasa
author | stefank |
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date | Mon, 22 Apr 2013 20:27:36 +0200 |
parents | 63e54c37ac64 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
0 | 22 * |
23 */ | |
24 | |
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25 #ifndef SHARE_VM_OOPS_SYMBOL_HPP |
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26 #define SHARE_VM_OOPS_SYMBOL_HPP |
1972 | 27 |
28 #include "utilities/utf8.hpp" | |
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29 #include "memory/allocation.hpp" |
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30 |
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31 // A Symbol is a canonicalized string. |
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32 // All Symbols reside in global SymbolTable and are reference counted. |
1972 | 33 |
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34 // Reference counting |
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35 // |
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36 // All Symbols are allocated and added to the SymbolTable. |
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37 // When a class is unloaded, the reference counts of the Symbol pointers in |
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38 // the ConstantPool and in InstanceKlass (see release_C_heap_structures) are |
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39 // decremented. When the reference count for a Symbol goes to 0, the garbage |
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40 // collector can free the Symbol and remove it from the SymbolTable. |
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41 // |
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42 // 0) Symbols need to be reference counted when a pointer to the Symbol is |
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43 // saved in persistent storage. This does not include the pointer |
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44 // in the SymbolTable bucket (the _literal field in HashtableEntry) |
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45 // that points to the Symbol. All other stores of a Symbol* |
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46 // to a field of a persistent variable (e.g., the _name filed in |
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47 // FieldAccessInfo or _ptr in a CPSlot) is reference counted. |
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48 // |
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49 // 1) The lookup of a "name" in the SymbolTable either creates a Symbol F for |
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50 // "name" and returns a pointer to F or finds a pre-existing Symbol F for |
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51 // "name" and returns a pointer to it. In both cases the reference count for F |
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52 // is incremented under the assumption that a pointer to F will be created from |
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53 // the return value. Thus the increment of the reference count is on the lookup |
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54 // and not on the assignment to the new Symbol*. That is |
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55 // Symbol* G = lookup() |
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56 // ^ increment on lookup() |
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57 // and not |
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58 // Symbol* G = lookup() |
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59 // ^ increment on assignmnet |
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60 // The reference count must be decremented manually when the copy of the |
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61 // pointer G is destroyed. |
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62 // |
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63 // 2) For a local Symbol* A that is a copy of an existing Symbol* B, the |
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64 // reference counting is elided when the scope of B is greater than the scope |
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65 // of A. For example, in the code fragment |
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66 // below "klass" is passed as a parameter to the method. Symbol* "kn" |
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67 // is a copy of the name in "klass". |
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68 // |
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69 // Symbol* kn = klass->name(); |
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70 // unsigned int d_hash = dictionary()->compute_hash(kn, class_loader); |
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71 // |
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72 // The scope of "klass" is greater than the scope of "kn" so the reference |
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73 // counting for "kn" is elided. |
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74 // |
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75 // Symbol* copied from ConstantPool entries are good candidates for reference |
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76 // counting elision. The ConstantPool entries for a class C exist until C is |
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77 // unloaded. If a Symbol* is copied out of the ConstantPool into Symbol* X, |
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78 // the Symbol* in the ConstantPool will in general out live X so the reference |
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79 // counting on X can be elided. |
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80 // |
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81 // For cases where the scope of A is not greater than the scope of B, |
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82 // the reference counting is explicitly done. See ciSymbol, |
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83 // ResolutionErrorEntry and ClassVerifier for examples. |
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84 // |
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85 // 3) When a Symbol K is created for temporary use, generally for substrings of |
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86 // an existing symbol or to create a new symbol, assign it to a |
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87 // TempNewSymbol. The SymbolTable methods new_symbol(), lookup() |
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88 // and probe() all potentially return a pointer to a new Symbol. |
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89 // The allocation (or lookup) of K increments the reference count for K |
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90 // and the destructor decrements the reference count. |
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91 // |
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92 // Another example of TempNewSymbol usage is parsed_name used in |
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93 // ClassFileParser::parseClassFile() where parsed_name is used in the cleanup |
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94 // after a failed attempt to load a class. Here parsed_name is a |
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95 // TempNewSymbol (passed in as a parameter) so the reference count on its symbol |
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96 // will be decremented when it goes out of scope. |
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98 |
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99 // This cannot be inherited from ResourceObj because it cannot have a vtable. |
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100 // Since sometimes this is allocated from Metadata, pick a base allocation |
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101 // type without virtual functions. |
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102 class ClassLoaderData; |
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103 |
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104 class Symbol : public MetaspaceObj { |
0 | 105 friend class VMStructs; |
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106 friend class SymbolTable; |
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107 friend class MoveSymbols; |
0 | 108 private: |
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109 volatile int _refcount; |
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110 int _identity_hash; |
0 | 111 unsigned short _length; // number of UTF8 characters in the symbol |
112 jbyte _body[1]; | |
113 | |
114 enum { | |
115 // max_symbol_length is constrained by type of _length | |
116 max_symbol_length = (1 << 16) -1 | |
117 }; | |
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118 |
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119 static int size(int length) { |
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120 size_t sz = heap_word_size(sizeof(Symbol) + (length > 0 ? length - 1 : 0)); |
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121 return align_object_size(sz); |
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122 } |
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123 |
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124 void byte_at_put(int index, int value) { |
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125 assert(index >=0 && index < _length, "symbol index overflow"); |
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126 _body[index] = value; |
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127 } |
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128 |
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129 Symbol(const u1* name, int length, int refcount); |
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130 void* operator new(size_t size, int len, TRAPS); |
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131 void* operator new(size_t size, int len, Arena* arena, TRAPS); |
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132 void* operator new(size_t size, int len, ClassLoaderData* loader_data, TRAPS); |
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133 |
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134 void operator delete(void* p); |
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135 |
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137 // Low-level access (used with care, since not GC-safe) | |
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138 const jbyte* base() const { return &_body[0]; } |
0 | 139 |
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140 int size() { return size(utf8_length()); } |
0 | 141 |
142 // Returns the largest size symbol we can safely hold. | |
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143 static int max_length() { return max_symbol_length; } |
0 | 144 |
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145 int identity_hash() { return _identity_hash; } |
0 | 146 |
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147 // For symbol table alternate hashing |
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148 unsigned int new_hash(jint seed); |
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149 |
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150 // Reference counting. See comments above this class for when to use. |
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151 int refcount() const { return _refcount; } |
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152 void increment_refcount(); |
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153 void decrement_refcount(); |
0 | 154 |
155 int byte_at(int index) const { | |
156 assert(index >=0 && index < _length, "symbol index overflow"); | |
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157 return base()[index]; |
0 | 158 } |
159 | |
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160 const jbyte* bytes() const { return base(); } |
0 | 161 |
162 int utf8_length() const { return _length; } | |
163 | |
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164 // Compares the symbol with a string. |
0 | 165 bool equals(const char* str, int len) const; |
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166 bool equals(const char* str) const { return equals(str, (int) strlen(str)); } |
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167 |
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168 // Tests if the symbol starts with the given prefix. |
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169 bool starts_with(const char* prefix, int len) const; |
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170 bool starts_with(const char* prefix) const { |
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171 return starts_with(prefix, (int) strlen(prefix)); |
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172 } |
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173 |
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174 // Tests if the symbol starts with the given prefix. |
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175 int index_of_at(int i, const char* str, int len) const; |
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176 int index_of_at(int i, const char* str) const { |
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177 return index_of_at(i, str, (int) strlen(str)); |
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178 } |
0 | 179 |
180 // Three-way compare for sorting; returns -1/0/1 if receiver is </==/> than arg | |
181 // note that the ordering is not alfabetical | |
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182 inline int fast_compare(Symbol* other) const; |
0 | 183 |
184 // Returns receiver converted to null-terminated UTF-8 string; string is | |
185 // allocated in resource area, or in the char buffer provided by caller. | |
186 char* as_C_string() const; | |
187 char* as_C_string(char* buf, int size) const; | |
188 // Use buf if needed buffer length is <= size. | |
189 char* as_C_string_flexible_buffer(Thread* t, char* buf, int size) const; | |
190 | |
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191 // Returns an escaped form of a Java string. |
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192 char* as_quoted_ascii() const; |
0 | 193 |
194 // Returns a null terminated utf8 string in a resource array | |
195 char* as_utf8() const { return as_C_string(); } | |
196 char* as_utf8_flexible_buffer(Thread* t, char* buf, int size) const { | |
197 return as_C_string_flexible_buffer(t, buf, size); | |
198 } | |
199 | |
200 jchar* as_unicode(int& length) const; | |
201 | |
202 // Treating this symbol as a class name, returns the Java name for the class. | |
203 // String is allocated in resource area if buffer is not provided. | |
204 // See Klass::external_name() | |
205 const char* as_klass_external_name() const; | |
206 const char* as_klass_external_name(char* buf, int size) const; | |
207 | |
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208 // Printing |
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209 void print_symbol_on(outputStream* st = NULL) const; |
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210 void print_on(outputStream* st) const; // First level print |
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211 void print_value_on(outputStream* st) const; // Second level print. |
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212 |
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213 // printing on default output stream |
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214 void print() { print_on(tty); } |
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215 void print_value() { print_value_on(tty); } |
0 | 216 |
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217 #ifndef PRODUCT |
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218 // Empty constructor to create a dummy symbol object on stack |
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219 // only for getting its vtable pointer. |
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220 Symbol() { } |
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221 |
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222 static int _total_count; |
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223 #endif |
0 | 224 }; |
225 | |
226 // Note: this comparison is used for vtable sorting only; it doesn't matter | |
227 // what order it defines, as long as it is a total, time-invariant order | |
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228 // Since Symbol*s are in C_HEAP, their relative order in memory never changes, |
0 | 229 // so use address comparison for speed |
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230 int Symbol::fast_compare(Symbol* other) const { |
0 | 231 return (((uintptr_t)this < (uintptr_t)other) ? -1 |
232 : ((uintptr_t)this == (uintptr_t) other) ? 0 : 1); | |
233 } | |
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234 #endif // SHARE_VM_OOPS_SYMBOL_HPP |