Mercurial > hg > truffle
annotate src/share/vm/oops/symbol.cpp @ 6862:8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich.
Reviewed-by: johnc
Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
author | johnc |
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date | Sat, 06 Oct 2012 01:17:44 -0700 |
parents | da91efe96a93 |
children | bd7a7ce2e264 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 |
1972 | 26 #include "precompiled.hpp" |
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27 #include "classfile/altHashing.hpp" |
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28 #include "classfile/classLoaderData.hpp" |
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29 #include "oops/symbol.hpp" |
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30 #include "runtime/os.hpp" |
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31 #include "memory/allocation.inline.hpp" |
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32 #include "memory/resourceArea.hpp" |
0 | 33 |
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34 Symbol::Symbol(const u1* name, int length, int refcount) : _refcount(refcount), _length(length) { |
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35 _identity_hash = os::random(); |
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36 for (int i = 0; i < _length; i++) { |
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37 byte_at_put(i, name[i]); |
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38 } |
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39 } |
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40 |
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41 void* Symbol::operator new(size_t sz, int len, TRAPS) { |
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42 int alloc_size = size(len)*HeapWordSize; |
6197 | 43 address res = (address) AllocateHeap(alloc_size, mtSymbol); |
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44 return res; |
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45 } |
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46 |
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47 void* Symbol::operator new(size_t sz, int len, Arena* arena, TRAPS) { |
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48 int alloc_size = size(len)*HeapWordSize; |
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49 address res = (address)arena->Amalloc(alloc_size); |
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50 return res; |
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51 } |
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52 |
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53 void* Symbol::operator new(size_t sz, int len, ClassLoaderData* loader_data, TRAPS) { |
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54 address res; |
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55 int alloc_size = size(len)*HeapWordSize; |
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56 res = (address) Metaspace::allocate(loader_data, size(len), true, |
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57 Metaspace::NonClassType, CHECK_NULL); |
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58 return res; |
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59 } |
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60 |
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61 void Symbol::operator delete(void *p) { |
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62 assert(((Symbol*)p)->refcount() == 0, "should not call this"); |
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63 FreeHeap(p); |
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64 } |
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65 |
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66 // ------------------------------------------------------------------ |
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67 // Symbol::equals |
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68 // |
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69 // Compares the symbol with a string of the given length. |
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70 bool Symbol::equals(const char* str, int len) const { |
0 | 71 int l = utf8_length(); |
72 if (l != len) return false; | |
73 while (l-- > 0) { | |
74 if (str[l] != (char) byte_at(l)) | |
75 return false; | |
76 } | |
77 assert(l == -1, "we should be at the beginning"); | |
78 return true; | |
79 } | |
80 | |
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81 |
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82 // ------------------------------------------------------------------ |
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83 // Symbol::starts_with |
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84 // |
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85 // Tests if the symbol starts with the specified prefix of the given |
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86 // length. |
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87 bool Symbol::starts_with(const char* prefix, int len) const { |
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88 if (len > utf8_length()) return false; |
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89 while (len-- > 0) { |
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90 if (prefix[len] != (char) byte_at(len)) |
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91 return false; |
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92 } |
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93 assert(len == -1, "we should be at the beginning"); |
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94 return true; |
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95 } |
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96 |
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97 |
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98 // ------------------------------------------------------------------ |
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99 // Symbol::index_of |
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100 // |
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101 // Finds if the given string is a substring of this symbol's utf8 bytes. |
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102 // Return -1 on failure. Otherwise return the first index where str occurs. |
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103 int Symbol::index_of_at(int i, const char* str, int len) const { |
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104 assert(i >= 0 && i <= utf8_length(), "oob"); |
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105 if (len <= 0) return 0; |
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106 char first_char = str[0]; |
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107 address bytes = (address) ((Symbol*)this)->base(); |
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108 address limit = bytes + utf8_length() - len; // inclusive limit |
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109 address scan = bytes + i; |
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110 if (scan > limit) |
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111 return -1; |
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112 for (; scan <= limit; scan++) { |
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113 scan = (address) memchr(scan, first_char, (limit + 1 - scan)); |
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114 if (scan == NULL) |
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115 return -1; // not found |
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116 assert(scan >= bytes+i && scan <= limit, "scan oob"); |
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117 if (memcmp(scan, str, len) == 0) |
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118 return (int)(scan - bytes); |
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119 } |
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120 return -1; |
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121 } |
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122 |
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123 |
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124 char* Symbol::as_C_string(char* buf, int size) const { |
0 | 125 if (size > 0) { |
126 int len = MIN2(size - 1, utf8_length()); | |
127 for (int i = 0; i < len; i++) { | |
128 buf[i] = byte_at(i); | |
129 } | |
130 buf[len] = '\0'; | |
131 } | |
132 return buf; | |
133 } | |
134 | |
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135 char* Symbol::as_C_string() const { |
0 | 136 int len = utf8_length(); |
137 char* str = NEW_RESOURCE_ARRAY(char, len + 1); | |
138 return as_C_string(str, len + 1); | |
139 } | |
140 | |
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141 char* Symbol::as_C_string_flexible_buffer(Thread* t, |
0 | 142 char* buf, int size) const { |
143 char* str; | |
144 int len = utf8_length(); | |
145 int buf_len = len + 1; | |
146 if (size < buf_len) { | |
147 str = NEW_RESOURCE_ARRAY(char, buf_len); | |
148 } else { | |
149 str = buf; | |
150 } | |
151 return as_C_string(str, buf_len); | |
152 } | |
153 | |
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154 void Symbol::print_symbol_on(outputStream* st) const { |
0 | 155 st = st ? st : tty; |
222 | 156 int length = UTF8::unicode_length((const char*)bytes(), utf8_length()); |
157 const char *ptr = (const char *)bytes(); | |
158 jchar value; | |
159 for (int index = 0; index < length; index++) { | |
160 ptr = UTF8::next(ptr, &value); | |
161 if (value >= 32 && value < 127 || value == '\'' || value == '\\') { | |
162 st->put(value); | |
163 } else { | |
164 st->print("\\u%04x", value); | |
165 } | |
166 } | |
0 | 167 } |
168 | |
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169 jchar* Symbol::as_unicode(int& length) const { |
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170 Symbol* this_ptr = (Symbol*)this; |
0 | 171 length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length()); |
172 jchar* result = NEW_RESOURCE_ARRAY(jchar, length); | |
173 if (length > 0) { | |
174 UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length); | |
175 } | |
176 return result; | |
177 } | |
178 | |
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179 const char* Symbol::as_klass_external_name(char* buf, int size) const { |
0 | 180 if (size > 0) { |
181 char* str = as_C_string(buf, size); | |
182 int length = (int)strlen(str); | |
183 // Turn all '/'s into '.'s (also for array klasses) | |
184 for (int index = 0; index < length; index++) { | |
185 if (str[index] == '/') { | |
186 str[index] = '.'; | |
187 } | |
188 } | |
189 return str; | |
190 } else { | |
191 return buf; | |
192 } | |
193 } | |
194 | |
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195 const char* Symbol::as_klass_external_name() const { |
0 | 196 char* str = as_C_string(); |
197 int length = (int)strlen(str); | |
198 // Turn all '/'s into '.'s (also for array klasses) | |
199 for (int index = 0; index < length; index++) { | |
200 if (str[index] == '/') { | |
201 str[index] = '.'; | |
202 } | |
203 } | |
204 return str; | |
205 } | |
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206 |
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207 // Alternate hashing for unbalanced symbol tables. |
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208 unsigned int Symbol::new_hash(jint seed) { |
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209 ResourceMark rm; |
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210 // Use alternate hashing algorithm on this symbol. |
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211 return AltHashing::murmur3_32(seed, (const jbyte*)as_C_string(), utf8_length()); |
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212 } |
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213 |
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214 void Symbol::print_on(outputStream* st) const { |
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215 if (this == NULL) { |
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216 st->print_cr("NULL"); |
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217 } else { |
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218 st->print("Symbol: '"); |
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219 print_symbol_on(st); |
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220 st->print("'"); |
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221 st->print(" count %d", refcount()); |
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222 } |
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223 } |
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224 |
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225 // The print_value functions are present in all builds, to support the |
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226 // disassembler and error reporting. |
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227 void Symbol::print_value_on(outputStream* st) const { |
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228 if (this == NULL) { |
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229 st->print("NULL"); |
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230 } else { |
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231 st->print("'"); |
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232 for (int i = 0; i < utf8_length(); i++) { |
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233 st->print("%c", byte_at(i)); |
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234 } |
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235 st->print("'"); |
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236 } |
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237 } |
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238 |
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239 // SymbolTable prints this in its statistics |
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240 NOT_PRODUCT(int Symbol::_total_count = 0;) |