diff -r e55dfb7bd4a9 -r 251814950cb2 hotspot/src/share/vm/oops/symbolOop.hpp --- a/hotspot/src/share/vm/oops/symbolOop.hpp Thu Feb 03 17:22:06 2011 -0800 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,139 +0,0 @@ -/* - * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - * - */ - -#ifndef SHARE_VM_OOPS_SYMBOLOOP_HPP -#define SHARE_VM_OOPS_SYMBOLOOP_HPP - -#include "oops/typeArrayOop.hpp" -#include "utilities/utf8.hpp" - -// A symbolOop is a canonicalized string. -// All symbolOops reside in global symbolTable. -// See oopFactory::new_symbol for how to allocate a symbolOop - -class symbolOopDesc : public oopDesc { - friend class VMStructs; - private: - unsigned short _length; // number of UTF8 characters in the symbol - jbyte _body[1]; - - enum { - // max_symbol_length is constrained by type of _length - max_symbol_length = (1 << 16) -1 - }; - public: - - // Low-level access (used with care, since not GC-safe) - jbyte* base() { return &_body[0]; } - - - // Returns the largest size symbol we can safely hold. - static int max_length() { - return max_symbol_length; - } - - static int object_size(int length) { - int size = header_size() + (sizeof(unsigned short) + length + HeapWordSize - 1) / HeapWordSize; - return align_object_size(size); - } - - int object_size() { return object_size(utf8_length()); } - - int byte_at(int index) const { - assert(index >=0 && index < _length, "symbol index overflow"); - return ((symbolOopDesc*)this)->base()[index]; - } - - void byte_at_put(int index, int value) { - assert(index >=0 && index < _length, "symbol index overflow"); - ((symbolOopDesc*)this)->base()[index] = value; - } - - jbyte* bytes() { return base(); } - - int utf8_length() const { return _length; } - - void set_utf8_length(int len) { _length = len; } - - // Compares the symbol with a string. - bool equals(const char* str, int len) const; - bool equals(const char* str) const { return equals(str, (int) strlen(str)); } - - // Tests if the symbol starts with the given prefix. - bool starts_with(const char* prefix, int len) const; - bool starts_with(const char* prefix) const { - return starts_with(prefix, (int) strlen(prefix)); - } - - // Tests if the symbol starts with the given prefix. - int index_of_at(int i, const char* str, int len) const; - int index_of_at(int i, const char* str) const { - return index_of_at(i, str, (int) strlen(str)); - } - - // Three-way compare for sorting; returns -1/0/1 if receiver is than arg - // note that the ordering is not alfabetical - inline int fast_compare(symbolOop other) const; - - // Returns receiver converted to null-terminated UTF-8 string; string is - // allocated in resource area, or in the char buffer provided by caller. - char* as_C_string() const; - char* as_C_string(char* buf, int size) const; - // Use buf if needed buffer length is <= size. - char* as_C_string_flexible_buffer(Thread* t, char* buf, int size) const; - - - // Returns a null terminated utf8 string in a resource array - char* as_utf8() const { return as_C_string(); } - char* as_utf8_flexible_buffer(Thread* t, char* buf, int size) const { - return as_C_string_flexible_buffer(t, buf, size); - } - - jchar* as_unicode(int& length) const; - - // Treating this symbol as a class name, returns the Java name for the class. - // String is allocated in resource area if buffer is not provided. - // See Klass::external_name() - const char* as_klass_external_name() const; - const char* as_klass_external_name(char* buf, int size) const; - - bool object_is_parsable() const { - return (utf8_length() > 0 || (oop)this == Universe::emptySymbol()); - } - - // Printing - void print_symbol_on(outputStream* st = NULL); -}; - - -// Note: this comparison is used for vtable sorting only; it doesn't matter -// what order it defines, as long as it is a total, time-invariant order -// Since symbolOops are in permSpace, their relative order in memory never changes, -// so use address comparison for speed -int symbolOopDesc::fast_compare(symbolOop other) const { - return (((uintptr_t)this < (uintptr_t)other) ? -1 - : ((uintptr_t)this == (uintptr_t) other) ? 0 : 1); -} - -#endif // SHARE_VM_OOPS_SYMBOLOOP_HPP