Mercurial > hg > truffle
annotate src/share/vm/oops/symbol.cpp @ 3202:9352a9c26095
revert outer framesate scheduling change
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Fri, 08 Jul 2011 18:00:39 +0200 |
parents | 1d1603768966 |
children | fc9d8850ab8b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" |
27 #include "oops/oop.inline.hpp" | |
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28 #include "oops/symbol.hpp" |
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29 #include "runtime/os.hpp" |
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30 #include "memory/allocation.inline.hpp" |
0 | 31 |
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32 Symbol::Symbol(const u1* name, int length) : _refcount(0), _length(length) { |
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33 _identity_hash = os::random(); |
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34 for (int i = 0; i < _length; i++) { |
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35 byte_at_put(i, name[i]); |
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36 } |
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37 } |
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38 |
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39 void* Symbol::operator new(size_t size, int len) { |
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40 return (void *) AllocateHeap(object_size(len) * HeapWordSize, "symbol"); |
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41 } |
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42 |
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43 // ------------------------------------------------------------------ |
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44 // Symbol::equals |
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45 // |
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46 // Compares the symbol with a string of the given length. |
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47 bool Symbol::equals(const char* str, int len) const { |
0 | 48 int l = utf8_length(); |
49 if (l != len) return false; | |
50 while (l-- > 0) { | |
51 if (str[l] != (char) byte_at(l)) | |
52 return false; | |
53 } | |
54 assert(l == -1, "we should be at the beginning"); | |
55 return true; | |
56 } | |
57 | |
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58 |
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59 // ------------------------------------------------------------------ |
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60 // Symbol::starts_with |
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61 // |
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62 // Tests if the symbol starts with the specified prefix of the given |
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63 // length. |
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64 bool Symbol::starts_with(const char* prefix, int len) const { |
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65 if (len > utf8_length()) return false; |
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66 while (len-- > 0) { |
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67 if (prefix[len] != (char) byte_at(len)) |
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68 return false; |
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69 } |
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70 assert(len == -1, "we should be at the beginning"); |
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71 return true; |
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72 } |
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73 |
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74 |
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75 // ------------------------------------------------------------------ |
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76 // Symbol::index_of |
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77 // |
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78 // Finds if the given string is a substring of this symbol's utf8 bytes. |
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79 // Return -1 on failure. Otherwise return the first index where str occurs. |
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80 int Symbol::index_of_at(int i, const char* str, int len) const { |
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81 assert(i >= 0 && i <= utf8_length(), "oob"); |
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82 if (len <= 0) return 0; |
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83 char first_char = str[0]; |
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84 address bytes = (address) ((Symbol*)this)->base(); |
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85 address limit = bytes + utf8_length() - len; // inclusive limit |
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86 address scan = bytes + i; |
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87 if (scan > limit) |
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88 return -1; |
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89 for (;;) { |
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90 scan = (address) memchr(scan, first_char, (limit + 1 - scan)); |
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91 if (scan == NULL) |
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92 return -1; // not found |
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93 assert(scan >= bytes+i && scan <= limit, "scan oob"); |
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94 if (memcmp(scan, str, len) == 0) |
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95 return (int)(scan - bytes); |
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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 char* Symbol::as_C_string(char* buf, int size) const { |
0 | 101 if (size > 0) { |
102 int len = MIN2(size - 1, utf8_length()); | |
103 for (int i = 0; i < len; i++) { | |
104 buf[i] = byte_at(i); | |
105 } | |
106 buf[len] = '\0'; | |
107 } | |
108 return buf; | |
109 } | |
110 | |
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111 char* Symbol::as_C_string() const { |
0 | 112 int len = utf8_length(); |
113 char* str = NEW_RESOURCE_ARRAY(char, len + 1); | |
114 return as_C_string(str, len + 1); | |
115 } | |
116 | |
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117 char* Symbol::as_C_string_flexible_buffer(Thread* t, |
0 | 118 char* buf, int size) const { |
119 char* str; | |
120 int len = utf8_length(); | |
121 int buf_len = len + 1; | |
122 if (size < buf_len) { | |
123 str = NEW_RESOURCE_ARRAY(char, buf_len); | |
124 } else { | |
125 str = buf; | |
126 } | |
127 return as_C_string(str, buf_len); | |
128 } | |
129 | |
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130 void Symbol::print_symbol_on(outputStream* st) const { |
0 | 131 st = st ? st : tty; |
222 | 132 int length = UTF8::unicode_length((const char*)bytes(), utf8_length()); |
133 const char *ptr = (const char *)bytes(); | |
134 jchar value; | |
135 for (int index = 0; index < length; index++) { | |
136 ptr = UTF8::next(ptr, &value); | |
137 if (value >= 32 && value < 127 || value == '\'' || value == '\\') { | |
138 st->put(value); | |
139 } else { | |
140 st->print("\\u%04x", value); | |
141 } | |
142 } | |
0 | 143 } |
144 | |
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145 jchar* Symbol::as_unicode(int& length) const { |
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146 Symbol* this_ptr = (Symbol*)this; |
0 | 147 length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length()); |
148 jchar* result = NEW_RESOURCE_ARRAY(jchar, length); | |
149 if (length > 0) { | |
150 UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length); | |
151 } | |
152 return result; | |
153 } | |
154 | |
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155 const char* Symbol::as_klass_external_name(char* buf, int size) const { |
0 | 156 if (size > 0) { |
157 char* str = as_C_string(buf, size); | |
158 int length = (int)strlen(str); | |
159 // Turn all '/'s into '.'s (also for array klasses) | |
160 for (int index = 0; index < length; index++) { | |
161 if (str[index] == '/') { | |
162 str[index] = '.'; | |
163 } | |
164 } | |
165 return str; | |
166 } else { | |
167 return buf; | |
168 } | |
169 } | |
170 | |
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171 const char* Symbol::as_klass_external_name() const { |
0 | 172 char* str = as_C_string(); |
173 int length = (int)strlen(str); | |
174 // Turn all '/'s into '.'s (also for array klasses) | |
175 for (int index = 0; index < length; index++) { | |
176 if (str[index] == '/') { | |
177 str[index] = '.'; | |
178 } | |
179 } | |
180 return str; | |
181 } | |
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182 |
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183 |
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184 void Symbol::print_on(outputStream* st) const { |
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185 if (this == NULL) { |
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186 st->print_cr("NULL"); |
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187 } else { |
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188 st->print("Symbol: '"); |
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189 print_symbol_on(st); |
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190 st->print("'"); |
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191 st->print(" count %d", refcount()); |
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192 } |
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193 } |
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194 |
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195 // The print_value functions are present in all builds, to support the |
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196 // disassembler and error reporting. |
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197 void Symbol::print_value_on(outputStream* st) const { |
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198 if (this == NULL) { |
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199 st->print("NULL"); |
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200 } else { |
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201 st->print("'"); |
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202 for (int i = 0; i < utf8_length(); i++) { |
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203 st->print("%c", byte_at(i)); |
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204 } |
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205 st->print("'"); |
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206 } |
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207 } |
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208 |
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209 void Symbol::increment_refcount() { |
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210 // Only increment the refcount if positive. If negative either |
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211 // overflow has occurred or it is a permanent symbol in a read only |
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212 // shared archive. |
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213 if (_refcount >= 0) { |
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214 Atomic::inc(&_refcount); |
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215 NOT_PRODUCT(Atomic::inc(&_total_count);) |
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216 } |
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217 } |
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218 |
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219 void Symbol::decrement_refcount() { |
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220 if (_refcount >= 0) { |
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221 Atomic::dec(&_refcount); |
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222 #ifdef ASSERT |
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223 if (_refcount < 0) { |
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224 print(); |
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225 assert(false, "reference count underflow for symbol"); |
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226 } |
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227 #endif |
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228 } |
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229 } |
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230 |
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231 NOT_PRODUCT(int Symbol::_total_count = 0;) |