Mercurial > hg > graal-compiler
annotate src/share/vm/oops/symbol.cpp @ 7168:73e64867adb7
8003690: Example code in JVMTI GetStackTrace documentation is broken
Summary: Fixed to minor errors in example code
Reviewed-by: sspitsyn, dholmes
author | mikael |
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date | Wed, 21 Nov 2012 09:02:13 -0800 |
parents | bd7a7ce2e264 |
children | fcc9e7681d63 |
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; |
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156 st->print("%s", as_quoted_ascii()); |
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157 } |
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158 |
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159 char* Symbol::as_quoted_ascii() const { |
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160 const char *ptr = (const char *)&_body[0]; |
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161 int quoted_length = UTF8::quoted_ascii_length(ptr, utf8_length()); |
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162 char* result = NEW_RESOURCE_ARRAY(char, quoted_length + 1); |
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163 UTF8::as_quoted_ascii(ptr, result, quoted_length + 1); |
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164 return result; |
0 | 165 } |
166 | |
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167 jchar* Symbol::as_unicode(int& length) const { |
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168 Symbol* this_ptr = (Symbol*)this; |
0 | 169 length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length()); |
170 jchar* result = NEW_RESOURCE_ARRAY(jchar, length); | |
171 if (length > 0) { | |
172 UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length); | |
173 } | |
174 return result; | |
175 } | |
176 | |
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177 const char* Symbol::as_klass_external_name(char* buf, int size) const { |
0 | 178 if (size > 0) { |
179 char* str = as_C_string(buf, size); | |
180 int length = (int)strlen(str); | |
181 // Turn all '/'s into '.'s (also for array klasses) | |
182 for (int index = 0; index < length; index++) { | |
183 if (str[index] == '/') { | |
184 str[index] = '.'; | |
185 } | |
186 } | |
187 return str; | |
188 } else { | |
189 return buf; | |
190 } | |
191 } | |
192 | |
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193 const char* Symbol::as_klass_external_name() const { |
0 | 194 char* str = as_C_string(); |
195 int length = (int)strlen(str); | |
196 // Turn all '/'s into '.'s (also for array klasses) | |
197 for (int index = 0; index < length; index++) { | |
198 if (str[index] == '/') { | |
199 str[index] = '.'; | |
200 } | |
201 } | |
202 return str; | |
203 } | |
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204 |
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205 // Alternate hashing for unbalanced symbol tables. |
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206 unsigned int Symbol::new_hash(jint seed) { |
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207 ResourceMark rm; |
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208 // Use alternate hashing algorithm on this symbol. |
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209 return AltHashing::murmur3_32(seed, (const jbyte*)as_C_string(), utf8_length()); |
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210 } |
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211 |
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212 void Symbol::print_on(outputStream* st) const { |
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213 if (this == NULL) { |
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214 st->print_cr("NULL"); |
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215 } else { |
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216 st->print("Symbol: '"); |
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217 print_symbol_on(st); |
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218 st->print("'"); |
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219 st->print(" count %d", refcount()); |
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220 } |
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221 } |
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222 |
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223 // The print_value functions are present in all builds, to support the |
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224 // disassembler and error reporting. |
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225 void Symbol::print_value_on(outputStream* st) const { |
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226 if (this == NULL) { |
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227 st->print("NULL"); |
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228 } else { |
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229 st->print("'"); |
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230 for (int i = 0; i < utf8_length(); i++) { |
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231 st->print("%c", byte_at(i)); |
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232 } |
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233 st->print("'"); |
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234 } |
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235 } |
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236 |
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237 // SymbolTable prints this in its statistics |
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238 NOT_PRODUCT(int Symbol::_total_count = 0;) |