Mercurial > hg > truffle
annotate src/share/vm/oops/symbol.cpp @ 15814:066ed90d15a7
[inlining] another renaming to avoid misleading type suggestion (1 of 2)
author | Miguel Garcia <miguel.m.garcia@oracle.com> |
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date | Tue, 20 May 2014 15:45:07 +0200 |
parents | 4ca6dc0799b6 |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
14909 | 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 |
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/atomic.inline.hpp" |
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31 #include "runtime/os.hpp" |
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32 #include "memory/allocation.inline.hpp" |
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33 #include "memory/resourceArea.hpp" |
0 | 34 |
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35 Symbol::Symbol(const u1* name, int length, int refcount) { |
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36 _refcount = refcount; |
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37 _length = length; |
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38 _identity_hash = os::random(); |
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39 for (int i = 0; i < _length; i++) { |
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40 byte_at_put(i, name[i]); |
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41 } |
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42 } |
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43 |
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44 void* Symbol::operator new(size_t sz, int len, TRAPS) throw() { |
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45 int alloc_size = size(len)*HeapWordSize; |
6197 | 46 address res = (address) AllocateHeap(alloc_size, mtSymbol); |
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47 return res; |
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48 } |
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49 |
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50 void* Symbol::operator new(size_t sz, int len, Arena* arena, TRAPS) throw() { |
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51 int alloc_size = size(len)*HeapWordSize; |
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52 address res = (address)arena->Amalloc(alloc_size); |
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53 return res; |
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54 } |
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55 |
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56 void* Symbol::operator new(size_t sz, int len, ClassLoaderData* loader_data, TRAPS) throw() { |
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57 address res; |
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58 int alloc_size = size(len)*HeapWordSize; |
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59 res = (address) Metaspace::allocate(loader_data, size(len), true, |
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60 MetaspaceObj::SymbolType, CHECK_NULL); |
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61 return res; |
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62 } |
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63 |
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64 void Symbol::operator delete(void *p) { |
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65 assert(((Symbol*)p)->refcount() == 0, "should not call this"); |
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66 FreeHeap(p); |
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67 } |
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68 |
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69 // ------------------------------------------------------------------ |
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70 // Symbol::equals |
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71 // |
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72 // Compares the symbol with a string of the given length. |
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73 bool Symbol::equals(const char* str, int len) const { |
0 | 74 int l = utf8_length(); |
75 if (l != len) return false; | |
76 while (l-- > 0) { | |
77 if (str[l] != (char) byte_at(l)) | |
78 return false; | |
79 } | |
80 assert(l == -1, "we should be at the beginning"); | |
81 return true; | |
82 } | |
83 | |
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84 |
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85 // ------------------------------------------------------------------ |
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86 // Symbol::starts_with |
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87 // |
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88 // Tests if the symbol starts with the specified prefix of the given |
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89 // length. |
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90 bool Symbol::starts_with(const char* prefix, int len) const { |
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91 if (len > utf8_length()) return false; |
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92 while (len-- > 0) { |
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93 if (prefix[len] != (char) byte_at(len)) |
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94 return false; |
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95 } |
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96 assert(len == -1, "we should be at the beginning"); |
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97 return true; |
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98 } |
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99 |
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100 |
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101 // ------------------------------------------------------------------ |
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102 // Symbol::index_of |
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103 // |
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104 // Finds if the given string is a substring of this symbol's utf8 bytes. |
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105 // Return -1 on failure. Otherwise return the first index where str occurs. |
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106 int Symbol::index_of_at(int i, const char* str, int len) const { |
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107 assert(i >= 0 && i <= utf8_length(), "oob"); |
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108 if (len <= 0) return 0; |
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109 char first_char = str[0]; |
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110 address bytes = (address) ((Symbol*)this)->base(); |
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111 address limit = bytes + utf8_length() - len; // inclusive limit |
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112 address scan = bytes + i; |
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113 if (scan > limit) |
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114 return -1; |
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115 for (; scan <= limit; scan++) { |
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116 scan = (address) memchr(scan, first_char, (limit + 1 - scan)); |
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117 if (scan == NULL) |
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118 return -1; // not found |
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119 assert(scan >= bytes+i && scan <= limit, "scan oob"); |
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120 if (memcmp(scan, str, len) == 0) |
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121 return (int)(scan - bytes); |
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122 } |
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123 return -1; |
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124 } |
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125 |
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126 |
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127 char* Symbol::as_C_string(char* buf, int size) const { |
0 | 128 if (size > 0) { |
129 int len = MIN2(size - 1, utf8_length()); | |
130 for (int i = 0; i < len; i++) { | |
131 buf[i] = byte_at(i); | |
132 } | |
133 buf[len] = '\0'; | |
134 } | |
135 return buf; | |
136 } | |
137 | |
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138 char* Symbol::as_C_string() const { |
0 | 139 int len = utf8_length(); |
140 char* str = NEW_RESOURCE_ARRAY(char, len + 1); | |
141 return as_C_string(str, len + 1); | |
142 } | |
143 | |
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144 char* Symbol::as_C_string_flexible_buffer(Thread* t, |
0 | 145 char* buf, int size) const { |
146 char* str; | |
147 int len = utf8_length(); | |
148 int buf_len = len + 1; | |
149 if (size < buf_len) { | |
150 str = NEW_RESOURCE_ARRAY(char, buf_len); | |
151 } else { | |
152 str = buf; | |
153 } | |
154 return as_C_string(str, buf_len); | |
155 } | |
156 | |
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157 void Symbol::print_symbol_on(outputStream* st) const { |
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158 ResourceMark rm; |
0 | 159 st = st ? st : tty; |
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160 st->print("%s", as_quoted_ascii()); |
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161 } |
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162 |
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163 char* Symbol::as_quoted_ascii() const { |
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164 const char *ptr = (const char *)&_body[0]; |
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165 int quoted_length = UTF8::quoted_ascii_length(ptr, utf8_length()); |
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166 char* result = NEW_RESOURCE_ARRAY(char, quoted_length + 1); |
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167 UTF8::as_quoted_ascii(ptr, utf8_length(), result, quoted_length + 1); |
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168 return result; |
0 | 169 } |
170 | |
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171 jchar* Symbol::as_unicode(int& length) const { |
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172 Symbol* this_ptr = (Symbol*)this; |
0 | 173 length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length()); |
174 jchar* result = NEW_RESOURCE_ARRAY(jchar, length); | |
175 if (length > 0) { | |
176 UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length); | |
177 } | |
178 return result; | |
179 } | |
180 | |
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181 const char* Symbol::as_klass_external_name(char* buf, int size) const { |
0 | 182 if (size > 0) { |
183 char* str = as_C_string(buf, size); | |
184 int length = (int)strlen(str); | |
185 // Turn all '/'s into '.'s (also for array klasses) | |
186 for (int index = 0; index < length; index++) { | |
187 if (str[index] == '/') { | |
188 str[index] = '.'; | |
189 } | |
190 } | |
191 return str; | |
192 } else { | |
193 return buf; | |
194 } | |
195 } | |
196 | |
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197 const char* Symbol::as_klass_external_name() const { |
0 | 198 char* str = as_C_string(); |
199 int length = (int)strlen(str); | |
200 // Turn all '/'s into '.'s (also for array klasses) | |
201 for (int index = 0; index < length; index++) { | |
202 if (str[index] == '/') { | |
203 str[index] = '.'; | |
204 } | |
205 } | |
206 return str; | |
207 } | |
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208 |
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209 // Alternate hashing for unbalanced symbol tables. |
14909 | 210 unsigned int Symbol::new_hash(jint seed) { |
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211 ResourceMark rm; |
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212 // Use alternate hashing algorithm on this symbol. |
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213 return AltHashing::murmur3_32(seed, (const jbyte*)as_C_string(), utf8_length()); |
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214 } |
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215 |
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216 void Symbol::increment_refcount() { |
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217 // Only increment the refcount if positive. If negative either |
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218 // overflow has occurred or it is a permanent symbol in a read only |
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219 // shared archive. |
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220 if (_refcount >= 0) { |
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221 Atomic::inc(&_refcount); |
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222 NOT_PRODUCT(Atomic::inc(&_total_count);) |
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223 } |
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224 } |
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225 |
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226 void Symbol::decrement_refcount() { |
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227 if (_refcount >= 0) { |
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228 Atomic::dec(&_refcount); |
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229 #ifdef ASSERT |
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230 if (_refcount < 0) { |
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231 print(); |
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232 assert(false, "reference count underflow for symbol"); |
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233 } |
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234 #endif |
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235 } |
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236 } |
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237 |
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238 void Symbol::print_on(outputStream* st) const { |
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239 if (this == NULL) { |
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240 st->print_cr("NULL"); |
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241 } else { |
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242 st->print("Symbol: '"); |
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243 print_symbol_on(st); |
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244 st->print("'"); |
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245 st->print(" count %d", refcount()); |
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246 } |
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247 } |
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248 |
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249 // The print_value functions are present in all builds, to support the |
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250 // disassembler and error reporting. |
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251 void Symbol::print_value_on(outputStream* st) const { |
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252 if (this == NULL) { |
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253 st->print("NULL"); |
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254 } else { |
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255 st->print("'"); |
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256 for (int i = 0; i < utf8_length(); i++) { |
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257 st->print("%c", byte_at(i)); |
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258 } |
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259 st->print("'"); |
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260 } |
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261 } |
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262 |
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263 // SymbolTable prints this in its statistics |
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264 NOT_PRODUCT(int Symbol::_total_count = 0;) |