Fri, 23 Mar 2012 11:16:05 -0400
7150058: Allocate symbols from null boot loader to an arena for NMT
Summary: Move symbol allocation to an arena so NMT doesn't have to track them at startup.
Reviewed-by: never, kamg, zgu
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 */
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"
32 Symbol::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 }
39 void* Symbol::operator new(size_t sz, int len, TRAPS) {
40 int alloc_size = object_size(len)*HeapWordSize;
41 address res = (address) AllocateHeap(alloc_size, "symbol");
42 DEBUG_ONLY(set_allocation_type(res, ResourceObj::C_HEAP);)
43 return res;
44 }
46 void* 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 }
53 // ------------------------------------------------------------------
54 // Symbol::equals
55 //
56 // Compares the symbol with a string of the given length.
57 bool 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 }
69 // ------------------------------------------------------------------
70 // Symbol::starts_with
71 //
72 // Tests if the symbol starts with the specified prefix of the given
73 // length.
74 bool 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 }
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.
90 int 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 }
110 char* 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 }
121 char* 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 }
127 char* 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 }
140 void 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 }
155 jchar* 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 }
165 const 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 }
181 const 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 }
194 void 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 }
205 // The print_value functions are present in all builds, to support the
206 // disassembler and error reporting.
207 void 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 }
219 // SymbolTable prints this in its statistics
220 NOT_PRODUCT(int Symbol::_total_count = 0;)