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src/share/vm/ci/ciSymbol.hpp@3582bf76420e (annotated)

src/share/vm/ci/ciSymbol.hpp

Thu, 27 Jan 2011 16:11:27 -0800

author

coleenp

date

Thu, 27 Jan 2011 16:11:27 -0800

changeset 2497

3582bf76420e

parent 2314

f95d63e2154a

child 2708

1d1603768966

permissions

-rw-r--r--

6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_CI_CISYMBOL_HPP
stefank@2314	26	#define SHARE_VM_CI_CISYMBOL_HPP
stefank@2314	27
stefank@2314	28	#include "ci/ciObject.hpp"
stefank@2314	29	#include "ci/ciObjectFactory.hpp"
stefank@2314	30	#include "classfile/vmSymbols.hpp"
coleenp@2497	31	#include "oops/symbol.hpp"
stefank@2314	32
duke@435	33	// ciSymbol
duke@435	34	//
coleenp@2497	35	// This class represents a Symbol* in the HotSpot virtual
duke@435	36	// machine.
coleenp@2497	37	class ciSymbol : public ResourceObj {
coleenp@2497	38	Symbol* _symbol;
coleenp@2497	39	uint _ident;
coleenp@2497	40
duke@435	41	CI_PACKAGE_ACCESS
coleenp@2497	42	// These friends all make direct use of get_symbol:
duke@435	43	friend class ciEnv;
duke@435	44	friend class ciInstanceKlass;
duke@435	45	friend class ciSignature;
duke@435	46	friend class ciMethod;
duke@435	47	friend class ciObjArrayKlass;
duke@435	48
duke@435	49	private:
jrose@1862	50	const vmSymbols::SID _sid;
coleenp@2497	51	DEBUG_ONLY( bool sid_ok() { return vmSymbols::find_sid(get_symbol()) == _sid; } )
jrose@1862	52
coleenp@2497	53	ciSymbol(Symbol* s); // normal case, for symbols not mentioned in vmSymbols
coleenp@2497	54	ciSymbol(Symbol* s, vmSymbols::SID sid); // for use with vmSymbols
duke@435	55
coleenp@2497	56	Symbol* get_symbol() const { return _symbol; }
duke@435	57
duke@435	58	const char* type_string() { return "ciSymbol"; }
duke@435	59
duke@435	60	void print_impl(outputStream* st);
duke@435	61
coleenp@2497	62	// This is public in Symbol* but private here, because the base can move:
coleenp@2497	63	const jbyte* base();
duke@435	64
duke@435	65	// Make a ciSymbol from a C string (implementation).
duke@435	66	static ciSymbol* make_impl(const char* s);
duke@435	67
coleenp@2497	68	void set_ident(uint id) { _ident = id; }
duke@435	69	public:
coleenp@2497	70	// A number unique to this object.
coleenp@2497	71	uint ident() { return _ident; }
coleenp@2497	72
jrose@1862	73	// The enumeration ID from vmSymbols, or vmSymbols::NO_SID if none.
jrose@1862	74	vmSymbols::SID sid() const { return _sid; }
jrose@1862	75
duke@435	76	// The text of the symbol as a null-terminated utf8 string.
duke@435	77	const char* as_utf8();
duke@435	78	int utf8_length();
duke@435	79
twisti@1573	80	// Return the i-th utf8 byte, where i < utf8_length
twisti@1573	81	int byte_at(int i);
twisti@1573	82
twisti@1573	83	// Tests if the symbol starts with the given prefix.
twisti@1573	84	bool starts_with(const char* prefix, int len) const;
twisti@1573	85
twisti@1573	86	// Determines where the symbol contains the given substring.
twisti@1573	87	int index_of_at(int i, const char* str, int len) const;
twisti@1573	88
duke@435	89	void print_symbol_on(outputStream* st);
duke@435	90	void print_symbol() {
duke@435	91	print_symbol_on(tty);
duke@435	92	}
duke@435	93
duke@435	94	// Make a ciSymbol from a C string.
duke@435	95	// Consider adding to vmSymbols.hpp instead of using this constructor.
duke@435	96	// (Your code will be less subject to typographical bugs.)
duke@435	97	static ciSymbol* make(const char* s);
duke@435	98
duke@435	99	#define CI_SYMBOL_DECLARE(name, ignore_def) \
duke@435	100	static ciSymbol* name() { return ciObjectFactory::vm_symbol_at(vmSymbols::VM_SYMBOL_ENUM_NAME(name)); }
duke@435	101	VM_SYMBOLS_DO(CI_SYMBOL_DECLARE, CI_SYMBOL_DECLARE)
duke@435	102	#undef CI_SYMBOL_DECLARE
coleenp@2497	103
coleenp@2497	104	void print() {
coleenp@2497	105	_symbol->print();
coleenp@2497	106	}
coleenp@2497	107
coleenp@2497	108	// Are two ciSymbols equal?
coleenp@2497	109	bool equals(ciSymbol* obj) { return this->_symbol == obj->get_symbol(); }
duke@435	110	};
stefank@2314	111
stefank@2314	112	#endif // SHARE_VM_CI_CISYMBOL_HPP