symbol.cpp revision 3465:d2a62e0f25eb
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 26#include "precompiled.hpp" 27#include "oops/oop.inline.hpp" 28#include "oops/symbol.hpp" 29#include "runtime/os.hpp" 30#include "memory/allocation.inline.hpp" 31 32Symbol::Symbol(const u1* name, int length, int refcount) : _refcount(refcount), _length(length) { 33 _identity_hash = os::random(); 34 for (int i = 0; i < _length; i++) { 35 byte_at_put(i, name[i]); 36 } 37} 38 39void* Symbol::operator new(size_t sz, int len, TRAPS) { 40 int alloc_size = object_size(len)*HeapWordSize; 41 address res = (address) AllocateHeap(alloc_size, mtSymbol); 42 DEBUG_ONLY(set_allocation_type(res, ResourceObj::C_HEAP);) 43 return res; 44} 45 46void* Symbol::operator new(size_t sz, int len, Arena* arena, TRAPS) { 47 int alloc_size = object_size(len)*HeapWordSize; 48 address res = (address)arena->Amalloc(alloc_size); 49 DEBUG_ONLY(set_allocation_type(res, ResourceObj::ARENA);) 50 return res; 51} 52 53// ------------------------------------------------------------------ 54// Symbol::equals 55// 56// Compares the symbol with a string of the given length. 57bool Symbol::equals(const char* str, int len) const { 58 int l = utf8_length(); 59 if (l != len) return false; 60 while (l-- > 0) { 61 if (str[l] != (char) byte_at(l)) 62 return false; 63 } 64 assert(l == -1, "we should be at the beginning"); 65 return true; 66} 67 68 69// ------------------------------------------------------------------ 70// Symbol::starts_with 71// 72// Tests if the symbol starts with the specified prefix of the given 73// length. 74bool Symbol::starts_with(const char* prefix, int len) const { 75 if (len > utf8_length()) return false; 76 while (len-- > 0) { 77 if (prefix[len] != (char) byte_at(len)) 78 return false; 79 } 80 assert(len == -1, "we should be at the beginning"); 81 return true; 82} 83 84 85// ------------------------------------------------------------------ 86// Symbol::index_of 87// 88// Finds if the given string is a substring of this symbol's utf8 bytes. 89// Return -1 on failure. Otherwise return the first index where str occurs. 90int Symbol::index_of_at(int i, const char* str, int len) const { 91 assert(i >= 0 && i <= utf8_length(), "oob"); 92 if (len <= 0) return 0; 93 char first_char = str[0]; 94 address bytes = (address) ((Symbol*)this)->base(); 95 address limit = bytes + utf8_length() - len; // inclusive limit 96 address scan = bytes + i; 97 if (scan > limit) 98 return -1; 99 for (;;) { 100 scan = (address) memchr(scan, first_char, (limit + 1 - scan)); 101 if (scan == NULL) 102 return -1; // not found 103 assert(scan >= bytes+i && scan <= limit, "scan oob"); 104 if (memcmp(scan, str, len) == 0) 105 return (int)(scan - bytes); 106 } 107} 108 109 110char* Symbol::as_C_string(char* buf, int size) const { 111 if (size > 0) { 112 int len = MIN2(size - 1, utf8_length()); 113 for (int i = 0; i < len; i++) { 114 buf[i] = byte_at(i); 115 } 116 buf[len] = '\0'; 117 } 118 return buf; 119} 120 121char* Symbol::as_C_string() const { 122 int len = utf8_length(); 123 char* str = NEW_RESOURCE_ARRAY(char, len + 1); 124 return as_C_string(str, len + 1); 125} 126 127char* Symbol::as_C_string_flexible_buffer(Thread* t, 128 char* buf, int size) const { 129 char* str; 130 int len = utf8_length(); 131 int buf_len = len + 1; 132 if (size < buf_len) { 133 str = NEW_RESOURCE_ARRAY(char, buf_len); 134 } else { 135 str = buf; 136 } 137 return as_C_string(str, buf_len); 138} 139 140void Symbol::print_symbol_on(outputStream* st) const { 141 st = st ? st : tty; 142 int length = UTF8::unicode_length((const char*)bytes(), utf8_length()); 143 const char *ptr = (const char *)bytes(); 144 jchar value; 145 for (int index = 0; index < length; index++) { 146 ptr = UTF8::next(ptr, &value); 147 if (value >= 32 && value < 127 || value == '\'' || value == '\\') { 148 st->put(value); 149 } else { 150 st->print("\\u%04x", value); 151 } 152 } 153} 154 155jchar* Symbol::as_unicode(int& length) const { 156 Symbol* this_ptr = (Symbol*)this; 157 length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length()); 158 jchar* result = NEW_RESOURCE_ARRAY(jchar, length); 159 if (length > 0) { 160 UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length); 161 } 162 return result; 163} 164 165const char* Symbol::as_klass_external_name(char* buf, int size) const { 166 if (size > 0) { 167 char* str = as_C_string(buf, size); 168 int length = (int)strlen(str); 169 // Turn all '/'s into '.'s (also for array klasses) 170 for (int index = 0; index < length; index++) { 171 if (str[index] == '/') { 172 str[index] = '.'; 173 } 174 } 175 return str; 176 } else { 177 return buf; 178 } 179} 180 181const char* Symbol::as_klass_external_name() const { 182 char* str = as_C_string(); 183 int length = (int)strlen(str); 184 // Turn all '/'s into '.'s (also for array klasses) 185 for (int index = 0; index < length; index++) { 186 if (str[index] == '/') { 187 str[index] = '.'; 188 } 189 } 190 return str; 191} 192 193 194void Symbol::print_on(outputStream* st) const { 195 if (this == NULL) { 196 st->print_cr("NULL"); 197 } else { 198 st->print("Symbol: '"); 199 print_symbol_on(st); 200 st->print("'"); 201 st->print(" count %d", refcount()); 202 } 203} 204 205// The print_value functions are present in all builds, to support the 206// disassembler and error reporting. 207void Symbol::print_value_on(outputStream* st) const { 208 if (this == NULL) { 209 st->print("NULL"); 210 } else { 211 st->print("'"); 212 for (int i = 0; i < utf8_length(); i++) { 213 st->print("%c", byte_at(i)); 214 } 215 st->print("'"); 216 } 217} 218 219// SymbolTable prints this in its statistics 220NOT_PRODUCT(int Symbol::_total_count = 0;) 221