--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/oops/symbolOop.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,118 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// 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;
+
+  // 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);
+}