author | coleenp |
Thu, 27 Jan 2011 16:11:27 -0800 | |
changeset 8076 | 96d498ec7ae1 |
parent 7397 | hotspot/src/share/vm/oops/symbolOop.cpp@5b173b4ca846 |
child 8921 | 14bfe81f2a9d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/symbol.hpp" |
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#include "runtime/os.hpp" |
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#include "memory/allocation.inline.hpp" |
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Symbol::Symbol(const u1* name, int length) : _refcount(0), _length(length) { |
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_identity_hash = os::random(); |
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for (int i = 0; i < _length; i++) { |
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byte_at_put(i, name[i]); |
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} |
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} |
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void* Symbol::operator new(size_t size, int len) { |
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return (void *) AllocateHeap(object_size(len) * HeapWordSize, "symbol"); |
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} |
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// ------------------------------------------------------------------ |
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// Symbol::equals |
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// |
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// Compares the symbol with a string of the given length. |
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bool Symbol::equals(const char* str, int len) const { |
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int l = utf8_length(); |
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if (l != len) return false; |
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while (l-- > 0) { |
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if (str[l] != (char) byte_at(l)) |
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return false; |
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} |
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assert(l == -1, "we should be at the beginning"); |
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return true; |
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} |
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// ------------------------------------------------------------------ |
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// Symbol::starts_with |
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// |
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// Tests if the symbol starts with the specified prefix of the given |
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// length. |
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bool Symbol::starts_with(const char* prefix, int len) const { |
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if (len > utf8_length()) return false; |
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while (len-- > 0) { |
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if (prefix[len] != (char) byte_at(len)) |
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return false; |
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} |
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assert(len == -1, "we should be at the beginning"); |
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return true; |
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} |
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// ------------------------------------------------------------------ |
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// Symbol::index_of |
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// |
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// Finds if the given string is a substring of this symbol's utf8 bytes. |
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// Return -1 on failure. Otherwise return the first index where str occurs. |
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int Symbol::index_of_at(int i, const char* str, int len) const { |
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assert(i >= 0 && i <= utf8_length(), "oob"); |
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if (len <= 0) return 0; |
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char first_char = str[0]; |
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address bytes = (address) ((Symbol*)this)->base(); |
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address limit = bytes + utf8_length() - len; // inclusive limit |
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address scan = bytes + i; |
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if (scan > limit) |
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return -1; |
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for (;;) { |
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scan = (address) memchr(scan, first_char, (limit + 1 - scan)); |
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if (scan == NULL) |
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return -1; // not found |
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assert(scan >= bytes+i && scan <= limit, "scan oob"); |
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if (memcmp(scan, str, len) == 0) |
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return (int)(scan - bytes); |
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} |
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} |
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char* Symbol::as_C_string(char* buf, int size) const { |
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if (size > 0) { |
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int len = MIN2(size - 1, utf8_length()); |
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for (int i = 0; i < len; i++) { |
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buf[i] = byte_at(i); |
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} |
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buf[len] = '\0'; |
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} |
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return buf; |
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} |
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char* Symbol::as_C_string() const { |
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int len = utf8_length(); |
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char* str = NEW_RESOURCE_ARRAY(char, len + 1); |
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return as_C_string(str, len + 1); |
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} |
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char* Symbol::as_C_string_flexible_buffer(Thread* t, |
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char* buf, int size) const { |
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char* str; |
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int len = utf8_length(); |
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int buf_len = len + 1; |
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if (size < buf_len) { |
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str = NEW_RESOURCE_ARRAY(char, buf_len); |
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} else { |
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str = buf; |
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} |
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return as_C_string(str, buf_len); |
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} |
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void Symbol::print_symbol_on(outputStream* st) const { |
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st = st ? st : tty; |
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int length = UTF8::unicode_length((const char*)bytes(), utf8_length()); |
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const char *ptr = (const char *)bytes(); |
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jchar value; |
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for (int index = 0; index < length; index++) { |
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ptr = UTF8::next(ptr, &value); |
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if (value >= 32 && value < 127 || value == '\'' || value == '\\') { |
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st->put(value); |
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} else { |
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st->print("\\u%04x", value); |
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} |
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} |
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} |
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jchar* Symbol::as_unicode(int& length) const { |
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Symbol* this_ptr = (Symbol*)this; |
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length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length()); |
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jchar* result = NEW_RESOURCE_ARRAY(jchar, length); |
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if (length > 0) { |
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UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length); |
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} |
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return result; |
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} |
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const char* Symbol::as_klass_external_name(char* buf, int size) const { |
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if (size > 0) { |
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char* str = as_C_string(buf, size); |
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int length = (int)strlen(str); |
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// Turn all '/'s into '.'s (also for array klasses) |
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for (int index = 0; index < length; index++) { |
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if (str[index] == '/') { |
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str[index] = '.'; |
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} |
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} |
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return str; |
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} else { |
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return buf; |
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} |
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} |
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const char* Symbol::as_klass_external_name() const { |
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char* str = as_C_string(); |
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int length = (int)strlen(str); |
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// Turn all '/'s into '.'s (also for array klasses) |
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for (int index = 0; index < length; index++) { |
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if (str[index] == '/') { |
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str[index] = '.'; |
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} |
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} |
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return str; |
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} |
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void Symbol::print_on(outputStream* st) const { |
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if (this == NULL) { |
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st->print_cr("NULL"); |
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} else { |
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st->print("Symbol: '"); |
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print_symbol_on(st); |
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st->print("'"); |
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st->print(" count %d", refcount()); |
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} |
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} |
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// The print_value functions are present in all builds, to support the |
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// disassembler and error reporting. |
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void Symbol::print_value_on(outputStream* st) const { |
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if (this == NULL) { |
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st->print("NULL"); |
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} else { |
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st->print("'"); |
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for (int i = 0; i < utf8_length(); i++) { |
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st->print("%c", byte_at(i)); |
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} |
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st->print("'"); |
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} |
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} |
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|
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void Symbol::increment_refcount() { |
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// Only increment the refcount if positive. If negative either |
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// overflow has occurred or it is a permanent symbol in a read only |
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// shared archive. |
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if (_refcount >= 0) { |
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Atomic::inc(&_refcount); |
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NOT_PRODUCT(Atomic::inc(&_total_count);) |
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} |
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} |
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|
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void Symbol::decrement_refcount() { |
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if (_refcount >= 0) { |
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Atomic::dec(&_refcount); |
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#ifdef ASSERT |
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if (_refcount < 0) { |
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print(); |
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assert(false, "reference count underflow for symbol"); |
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} |
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#endif |
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} |
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} |
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|
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NOT_PRODUCT(int Symbol::_total_count = 0;) |