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src/share/vm/utilities/constantTag.hpp@c96030fff130 (annotated)

src/share/vm/utilities/constantTag.hpp

Thu, 20 Nov 2008 16:56:09 -0800

author

ysr

date

Thu, 20 Nov 2008 16:56:09 -0800

changeset 888

c96030fff130

parent 866

a45484ea312d

child 905

ad8c8ca4ab0f

permissions

-rw-r--r--

6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa

duke@435	1	/*
duke@435	2	* Copyright 1997-2005 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// constant tags in Java .class files
duke@435	26
duke@435	27
duke@435	28	enum {
duke@435	29	// See jvm.h for shared JVM_CONSTANT_XXX tags
duke@435	30	// NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
duke@435	31	// Hotspot specific tags
duke@435	32	JVM_CONSTANT_Invalid = 0, // For bad value initialization
duke@435	33	JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course)
duke@435	34	JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use
duke@435	35	JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool
duke@435	36	JVM_CONSTANT_UnresolvedString = 102, // Temporary tag until actual use
duke@435	37	JVM_CONSTANT_StringIndex = 103, // Temporary tag while constructing constant pool
duke@435	38	JVM_CONSTANT_UnresolvedClassInError = 104, // Error tag due to resolution error
duke@435	39	JVM_CONSTANT_InternalMax = 104 // Last implementation tag
duke@435	40	};
duke@435	41
duke@435	42
duke@435	43	class constantTag VALUE_OBJ_CLASS_SPEC {
duke@435	44	private:
duke@435	45	jbyte _tag;
duke@435	46	public:
duke@435	47	bool is_klass() const { return _tag == JVM_CONSTANT_Class; }
duke@435	48	bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; }
duke@435	49	bool is_method() const { return _tag == JVM_CONSTANT_Methodref; }
duke@435	50	bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; }
duke@435	51	bool is_string() const { return _tag == JVM_CONSTANT_String; }
duke@435	52	bool is_int() const { return _tag == JVM_CONSTANT_Integer; }
duke@435	53	bool is_float() const { return _tag == JVM_CONSTANT_Float; }
duke@435	54	bool is_long() const { return _tag == JVM_CONSTANT_Long; }
duke@435	55	bool is_double() const { return _tag == JVM_CONSTANT_Double; }
duke@435	56	bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; }
duke@435	57	bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; }
duke@435	58
duke@435	59	bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; }
duke@435	60
duke@435	61	bool is_unresolved_klass() const {
duke@435	62	return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
duke@435	63	}
duke@435	64
duke@435	65	bool is_unresolved_klass_in_error() const {
duke@435	66	return _tag == JVM_CONSTANT_UnresolvedClassInError;
duke@435	67	}
duke@435	68
duke@435	69	bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; }
duke@435	70	bool is_unresolved_string() const { return _tag == JVM_CONSTANT_UnresolvedString; }
duke@435	71	bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; }
duke@435	72
duke@435	73	bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); }
jrose@866	74	bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
duke@435	75	bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); }
duke@435	76	bool is_symbol() const { return is_utf8(); }
duke@435	77
duke@435	78	constantTag(jbyte tag) {
duke@435	79	assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
duke@435	80	(tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
duke@435	81	_tag = tag;
duke@435	82	}
duke@435	83
duke@435	84	jbyte value() { return _tag; }
duke@435	85
duke@435	86	void print_on(outputStream* st) const PRODUCT_RETURN;
duke@435	87	};