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src/share/vm/ci/ciConstant.hpp@710a3c8b516e (annotated)

src/share/vm/ci/ciConstant.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 6198

55fb97c4c58d

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_CI_CICONSTANT_HPP
aoqi@0	26	#define SHARE_VM_CI_CICONSTANT_HPP
aoqi@0	27
aoqi@0	28	#include "ci/ciClassList.hpp"
aoqi@0	29	#include "ci/ciNullObject.hpp"
aoqi@0	30
aoqi@0	31	// ciConstant
aoqi@0	32	//
aoqi@0	33	// This class represents a constant value.
aoqi@0	34	class ciConstant VALUE_OBJ_CLASS_SPEC {
aoqi@0	35	friend class VMStructs;
aoqi@0	36	private:
aoqi@0	37	friend class ciEnv;
aoqi@0	38	friend class ciField;
aoqi@0	39
aoqi@0	40	BasicType _type;
aoqi@0	41	union {
aoqi@0	42	jint _int;
aoqi@0	43	jlong _long;
aoqi@0	44	jfloat _float;
aoqi@0	45	jdouble _double;
aoqi@0	46	ciObject* _object;
aoqi@0	47	} _value;
aoqi@0	48
aoqi@0	49	public:
aoqi@0	50
aoqi@0	51	ciConstant() {
aoqi@0	52	_type = T_ILLEGAL; _value._long = -1;
aoqi@0	53	}
aoqi@0	54	ciConstant(BasicType type, jint value) {
aoqi@0	55	assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
aoqi@0	56	"using the wrong ciConstant constructor");
aoqi@0	57	_type = type; _value._int = value;
aoqi@0	58	}
aoqi@0	59	ciConstant(jlong value) {
aoqi@0	60	_type = T_LONG; _value._long = value;
aoqi@0	61	}
aoqi@0	62	ciConstant(jfloat value) {
aoqi@0	63	_type = T_FLOAT; _value._float = value;
aoqi@0	64	}
aoqi@0	65	ciConstant(jdouble value) {
aoqi@0	66	_type = T_DOUBLE; _value._double = value;
aoqi@0	67	}
aoqi@0	68	ciConstant(BasicType type, ciObject* p) {
aoqi@0	69	_type = type; _value._object = p;
aoqi@0	70	}
aoqi@0	71
aoqi@0	72	BasicType basic_type() const { return _type; }
aoqi@0	73
aoqi@0	74	jboolean as_boolean() {
aoqi@0	75	assert(basic_type() == T_BOOLEAN, "wrong type");
aoqi@0	76	return (jboolean)_value._int;
aoqi@0	77	}
aoqi@0	78	jchar as_char() {
aoqi@0	79	assert(basic_type() == T_CHAR, "wrong type");
aoqi@0	80	return (jchar)_value._int;
aoqi@0	81	}
aoqi@0	82	jbyte as_byte() {
aoqi@0	83	assert(basic_type() == T_BYTE, "wrong type");
aoqi@0	84	return (jbyte)_value._int;
aoqi@0	85	}
aoqi@0	86	jshort as_short() {
aoqi@0	87	assert(basic_type() == T_SHORT, "wrong type");
aoqi@0	88	return (jshort)_value._int;
aoqi@0	89	}
aoqi@0	90	jint as_int() {
aoqi@0	91	assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR ||
aoqi@0	92	basic_type() == T_BYTE || basic_type() == T_SHORT ||
aoqi@0	93	basic_type() == T_INT, "wrong type");
aoqi@0	94	return _value._int;
aoqi@0	95	}
aoqi@0	96	jlong as_long() {
aoqi@0	97	assert(basic_type() == T_LONG, "wrong type");
aoqi@0	98	return _value._long;
aoqi@0	99	}
aoqi@0	100	jfloat as_float() {
aoqi@0	101	assert(basic_type() == T_FLOAT, "wrong type");
aoqi@0	102	return _value._float;
aoqi@0	103	}
aoqi@0	104	jdouble as_double() {
aoqi@0	105	assert(basic_type() == T_DOUBLE, "wrong type");
aoqi@0	106	return _value._double;
aoqi@0	107	}
aoqi@0	108	ciObject* as_object() const {
aoqi@0	109	assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
aoqi@0	110	return _value._object;
aoqi@0	111	}
aoqi@0	112
aoqi@0	113	bool is_null_or_zero() const {
aoqi@0	114	if (!is_java_primitive(basic_type())) {
aoqi@0	115	return as_object()->is_null_object();
aoqi@0	116	} else if (type2size[basic_type()] == 1) {
aoqi@0	117	// treat float bits as int, to avoid comparison with -0 and NaN
aoqi@0	118	return (_value._int == 0);
aoqi@0	119	} else if (type2size[basic_type()] == 2) {
aoqi@0	120	// treat double bits as long, to avoid comparison with -0 and NaN
aoqi@0	121	return (_value._long == 0);
aoqi@0	122	} else {
aoqi@0	123	return false;
aoqi@0	124	}
aoqi@0	125	}
aoqi@0	126
aoqi@0	127	// Debugging output
aoqi@0	128	void print();
aoqi@0	129	};
aoqi@0	130
aoqi@0	131	#endif // SHARE_VM_CI_CICONSTANT_HPP