hotspot/src/share/vm/ci/ciSymbol.hpp
author twisti
Tue, 05 Jan 2010 15:21:25 +0100
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permissions -rw-r--r--
6893268: additional dynamic language related optimizations in C2 Summary: C2 needs some additional optimizations to be able to handle MethodHandle invokes and invokedynamic instructions at the best performance. Reviewed-by: kvn, never
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/*
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 * Copyright 1999-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// ciSymbol
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//
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// This class represents a symbolOop in the HotSpot virtual
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// machine.
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class ciSymbol : public ciObject {
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  CI_PACKAGE_ACCESS
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  // These friends all make direct use of get_symbolOop:
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  friend class ciEnv;
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  friend class ciInstanceKlass;
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  friend class ciSignature;
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  friend class ciMethod;
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  friend class ciObjArrayKlass;
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private:
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  ciSymbol(symbolOop s) : ciObject(s) {}
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  ciSymbol(symbolHandle s);   // for use with vmSymbolHandles
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  symbolOop get_symbolOop() const { return (symbolOop)get_oop(); }
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  const char* type_string() { return "ciSymbol"; }
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  void print_impl(outputStream* st);
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  // This is public in symbolOop but private here, because the base can move:
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  jbyte*      base();
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  // Make a ciSymbol from a C string (implementation).
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  static ciSymbol* make_impl(const char* s);
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public:
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  // The text of the symbol as a null-terminated utf8 string.
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  const char* as_utf8();
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  int         utf8_length();
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  // Return the i-th utf8 byte, where i < utf8_length
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  int         byte_at(int i);
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  // Tests if the symbol starts with the given prefix.
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  bool starts_with(const char* prefix, int len) const;
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  // Determines where the symbol contains the given substring.
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  int index_of_at(int i, const char* str, int len) const;
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  // What kind of ciObject is this?
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  bool is_symbol() { return true; }
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  void print_symbol_on(outputStream* st);
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  void print_symbol() {
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    print_symbol_on(tty);
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  }
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  // Make a ciSymbol from a C string.
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  // Consider adding to vmSymbols.hpp instead of using this constructor.
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  // (Your code will be less subject to typographical bugs.)
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  static ciSymbol* make(const char* s);
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#define CI_SYMBOL_DECLARE(name, ignore_def) \
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  static ciSymbol* name() { return ciObjectFactory::vm_symbol_at(vmSymbols::VM_SYMBOL_ENUM_NAME(name)); }
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  VM_SYMBOLS_DO(CI_SYMBOL_DECLARE, CI_SYMBOL_DECLARE)
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#undef CI_SYMBOL_DECLARE
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};