Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/symbol.cpp @ 10283:e484fe2abebd
Merge
author | twisti |
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date | Thu, 16 May 2013 13:47:55 -0700 |
parents | 8c03fc47511d |
children | a1ebd310d5c1 |
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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 |
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) : _refcount(refcount), _length(length) { |
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36 _identity_hash = os::random(); |
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37 for (int i = 0; i < _length; i++) { |
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38 byte_at_put(i, name[i]); |
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39 } |
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40 } |
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41 |
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42 void* Symbol::operator new(size_t sz, int len, TRAPS) { |
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43 int alloc_size = size(len)*HeapWordSize; |
6197 | 44 address res = (address) AllocateHeap(alloc_size, mtSymbol); |
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45 return res; |
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46 } |
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47 |
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48 void* Symbol::operator new(size_t sz, int len, Arena* arena, TRAPS) { |
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49 int alloc_size = size(len)*HeapWordSize; |
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50 address res = (address)arena->Amalloc(alloc_size); |
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51 return res; |
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52 } |
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53 |
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54 void* Symbol::operator new(size_t sz, int len, ClassLoaderData* loader_data, TRAPS) { |
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55 address res; |
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56 int alloc_size = size(len)*HeapWordSize; |
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57 res = (address) Metaspace::allocate(loader_data, size(len), true, |
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58 Metaspace::NonClassType, CHECK_NULL); |
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59 return res; |
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60 } |
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61 |
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62 void Symbol::operator delete(void *p) { |
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63 assert(((Symbol*)p)->refcount() == 0, "should not call this"); |
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64 FreeHeap(p); |
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65 } |
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66 |
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67 // ------------------------------------------------------------------ |
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68 // Symbol::equals |
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69 // |
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70 // Compares the symbol with a string of the given length. |
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71 bool Symbol::equals(const char* str, int len) const { |
0 | 72 int l = utf8_length(); |
73 if (l != len) return false; | |
74 while (l-- > 0) { | |
75 if (str[l] != (char) byte_at(l)) | |
76 return false; | |
77 } | |
78 assert(l == -1, "we should be at the beginning"); | |
79 return true; | |
80 } | |
81 | |
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82 |
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83 // ------------------------------------------------------------------ |
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84 // Symbol::starts_with |
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85 // |
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86 // Tests if the symbol starts with the specified prefix of the given |
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87 // length. |
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88 bool Symbol::starts_with(const char* prefix, int len) const { |
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89 if (len > utf8_length()) return false; |
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90 while (len-- > 0) { |
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91 if (prefix[len] != (char) byte_at(len)) |
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92 return false; |
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93 } |
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94 assert(len == -1, "we should be at the beginning"); |
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95 return true; |
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96 } |
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97 |
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98 |
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99 // ------------------------------------------------------------------ |
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100 // Symbol::index_of |
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101 // |
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102 // Finds if the given string is a substring of this symbol's utf8 bytes. |
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103 // Return -1 on failure. Otherwise return the first index where str occurs. |
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104 int Symbol::index_of_at(int i, const char* str, int len) const { |
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105 assert(i >= 0 && i <= utf8_length(), "oob"); |
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106 if (len <= 0) return 0; |
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107 char first_char = str[0]; |
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108 address bytes = (address) ((Symbol*)this)->base(); |
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109 address limit = bytes + utf8_length() - len; // inclusive limit |
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110 address scan = bytes + i; |
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111 if (scan > limit) |
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112 return -1; |
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113 for (; scan <= limit; scan++) { |
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114 scan = (address) memchr(scan, first_char, (limit + 1 - scan)); |
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115 if (scan == NULL) |
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116 return -1; // not found |
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117 assert(scan >= bytes+i && scan <= limit, "scan oob"); |
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118 if (memcmp(scan, str, len) == 0) |
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119 return (int)(scan - bytes); |
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120 } |
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121 return -1; |
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122 } |
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123 |
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124 |
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125 char* Symbol::as_C_string(char* buf, int size) const { |
0 | 126 if (size > 0) { |
127 int len = MIN2(size - 1, utf8_length()); | |
128 for (int i = 0; i < len; i++) { | |
129 buf[i] = byte_at(i); | |
130 } | |
131 buf[len] = '\0'; | |
132 } | |
133 return buf; | |
134 } | |
135 | |
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136 char* Symbol::as_C_string() const { |
0 | 137 int len = utf8_length(); |
138 char* str = NEW_RESOURCE_ARRAY(char, len + 1); | |
139 return as_C_string(str, len + 1); | |
140 } | |
141 | |
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142 char* Symbol::as_C_string_flexible_buffer(Thread* t, |
0 | 143 char* buf, int size) const { |
144 char* str; | |
145 int len = utf8_length(); | |
146 int buf_len = len + 1; | |
147 if (size < buf_len) { | |
148 str = NEW_RESOURCE_ARRAY(char, buf_len); | |
149 } else { | |
150 str = buf; | |
151 } | |
152 return as_C_string(str, buf_len); | |
153 } | |
154 | |
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155 void Symbol::print_symbol_on(outputStream* st) const { |
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156 ResourceMark rm; |
0 | 157 st = st ? st : tty; |
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158 st->print("%s", as_quoted_ascii()); |
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159 } |
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160 |
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161 char* Symbol::as_quoted_ascii() const { |
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162 const char *ptr = (const char *)&_body[0]; |
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163 int quoted_length = UTF8::quoted_ascii_length(ptr, utf8_length()); |
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164 char* result = NEW_RESOURCE_ARRAY(char, quoted_length + 1); |
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165 UTF8::as_quoted_ascii(ptr, utf8_length(), result, quoted_length + 1); |
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166 return result; |
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::increment_refcount() { |
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215 // Only increment the refcount if positive. If negative either |
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216 // overflow has occurred or it is a permanent symbol in a read only |
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217 // shared archive. |
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218 if (_refcount >= 0) { |
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219 Atomic::inc(&_refcount); |
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220 NOT_PRODUCT(Atomic::inc(&_total_count);) |
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221 } |
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222 } |
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223 |
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224 void Symbol::decrement_refcount() { |
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225 if (_refcount >= 0) { |
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226 Atomic::dec(&_refcount); |
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227 #ifdef ASSERT |
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228 if (_refcount < 0) { |
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229 print(); |
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230 assert(false, "reference count underflow for symbol"); |
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231 } |
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232 #endif |
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233 } |
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234 } |
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235 |
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236 void Symbol::print_on(outputStream* st) const { |
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237 if (this == NULL) { |
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238 st->print_cr("NULL"); |
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239 } else { |
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240 st->print("Symbol: '"); |
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241 print_symbol_on(st); |
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242 st->print("'"); |
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243 st->print(" count %d", refcount()); |
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244 } |
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245 } |
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246 |
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247 // The print_value functions are present in all builds, to support the |
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248 // disassembler and error reporting. |
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249 void Symbol::print_value_on(outputStream* st) const { |
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250 if (this == NULL) { |
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251 st->print("NULL"); |
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252 } else { |
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253 st->print("'"); |
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254 for (int i = 0; i < utf8_length(); i++) { |
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255 st->print("%c", byte_at(i)); |
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256 } |
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257 st->print("'"); |
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258 } |
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259 } |
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260 |
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261 // SymbolTable prints this in its statistics |
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262 NOT_PRODUCT(int Symbol::_total_count = 0;) |