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src/share/vm/ci/ciConstant.hpp@b2ee5dc63353 (annotated)

src/share/vm/ci/ciConstant.hpp

Wed, 23 Oct 2013 12:40:23 +0200

author

roland

date

Wed, 23 Oct 2013 12:40:23 +0200

changeset 5991

b2ee5dc63353

parent 5658

edb5ab0f3fe5

child 6198

55fb97c4c58d

permissions

-rw-r--r--

8024070: C2 needs some form of type speculation
Summary: record unused type profile information with type system, propagate and use it.
Reviewed-by: kvn, twisti

duke@435	1	/*
never@3138	2	* Copyright (c) 1999, 2011, 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_CICONSTANT_HPP
stefank@2314	26	#define SHARE_VM_CI_CICONSTANT_HPP
stefank@2314	27
stefank@2314	28	#include "ci/ciClassList.hpp"
stefank@2314	29	#include "ci/ciNullObject.hpp"
stefank@2314	30
duke@435	31	// ciConstant
duke@435	32	//
duke@435	33	// This class represents a constant value.
duke@435	34	class ciConstant VALUE_OBJ_CLASS_SPEC {
never@3138	35	friend class VMStructs;
duke@435	36	private:
duke@435	37	friend class ciEnv;
duke@435	38	friend class ciField;
duke@435	39
duke@435	40	BasicType _type;
duke@435	41	union {
duke@435	42	jint _int;
duke@435	43	jlong _long;
duke@435	44	jfloat _float;
duke@435	45	jdouble _double;
duke@435	46	ciObject* _object;
duke@435	47	} _value;
duke@435	48
duke@435	49	public:
duke@435	50
duke@435	51	ciConstant() {
duke@435	52	_type = T_ILLEGAL; _value._long = -1;
duke@435	53	}
duke@435	54	ciConstant(BasicType type, jint value) {
duke@435	55	assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
duke@435	56	"using the wrong ciConstant constructor");
duke@435	57	_type = type; _value._int = value;
duke@435	58	}
duke@435	59	ciConstant(jlong value) {
duke@435	60	_type = T_LONG; _value._long = value;
duke@435	61	}
duke@435	62	ciConstant(jfloat value) {
duke@435	63	_type = T_FLOAT; _value._float = value;
duke@435	64	}
duke@435	65	ciConstant(jdouble value) {
duke@435	66	_type = T_DOUBLE; _value._double = value;
duke@435	67	}
duke@435	68	ciConstant(BasicType type, ciObject* p) {
duke@435	69	_type = type; _value._object = p;
duke@435	70	}
duke@435	71
duke@435	72	BasicType basic_type() const { return _type; }
duke@435	73
duke@435	74	jboolean as_boolean() {
duke@435	75	assert(basic_type() == T_BOOLEAN, "wrong type");
duke@435	76	return (jboolean)_value._int;
duke@435	77	}
duke@435	78	jchar as_char() {
duke@435	79	assert(basic_type() == T_CHAR, "wrong type");
duke@435	80	return (jchar)_value._int;
duke@435	81	}
duke@435	82	jbyte as_byte() {
duke@435	83	assert(basic_type() == T_BYTE, "wrong type");
duke@435	84	return (jbyte)_value._int;
duke@435	85	}
duke@435	86	jshort as_short() {
duke@435	87	assert(basic_type() == T_SHORT, "wrong type");
duke@435	88	return (jshort)_value._int;
duke@435	89	}
duke@435	90	jint as_int() {
duke@435	91	assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR ||
duke@435	92	basic_type() == T_BYTE || basic_type() == T_SHORT ||
duke@435	93	basic_type() == T_INT, "wrong type");
duke@435	94	return _value._int;
duke@435	95	}
duke@435	96	jlong as_long() {
duke@435	97	assert(basic_type() == T_LONG, "wrong type");
duke@435	98	return _value._long;
duke@435	99	}
duke@435	100	jfloat as_float() {
duke@435	101	assert(basic_type() == T_FLOAT, "wrong type");
duke@435	102	return _value._float;
duke@435	103	}
duke@435	104	jdouble as_double() {
duke@435	105	assert(basic_type() == T_DOUBLE, "wrong type");
duke@435	106	return _value._double;
duke@435	107	}
duke@435	108	ciObject* as_object() const {
duke@435	109	assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
duke@435	110	return _value._object;
duke@435	111	}
duke@435	112
vlivanov@5658	113	bool is_null_or_zero() const {
vlivanov@5658	114	if (!is_java_primitive(basic_type())) {
vlivanov@5658	115	return as_object()->is_null_object();
vlivanov@5658	116	} else if (type2size[basic_type()] == 1) {
vlivanov@5658	117	// treat float bits as int, to avoid comparison with -0 and NaN
vlivanov@5658	118	return (_value._int == 0);
vlivanov@5658	119	} else if (type2size[basic_type()] == 2) {
vlivanov@5658	120	// treat double bits as long, to avoid comparison with -0 and NaN
vlivanov@5658	121	return (_value._long == 0);
vlivanov@5658	122	} else {
vlivanov@5658	123	return false;
vlivanov@5658	124	}
vlivanov@5658	125	}
vlivanov@5658	126
duke@435	127	// Debugging output
duke@435	128	void print();
duke@435	129	};
stefank@2314	130
stefank@2314	131	#endif // SHARE_VM_CI_CICONSTANT_HPP