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src/share/vm/ci/ciArray.cpp@ac27a9c85bea (annotated)

src/share/vm/ci/ciArray.cpp

Thu, 24 May 2018 18:41:44 +0800

author

aoqi

date

Thu, 24 May 2018 18:41:44 +0800

changeset 8856

ac27a9c85bea

parent 6876

710a3c8b516e

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	#include "precompiled.hpp"
aoqi@0	26	#include "ci/ciArray.hpp"
aoqi@0	27	#include "ci/ciArrayKlass.hpp"
aoqi@0	28	#include "ci/ciConstant.hpp"
aoqi@0	29	#include "ci/ciKlass.hpp"
aoqi@0	30	#include "ci/ciUtilities.hpp"
aoqi@0	31	#include "oops/objArrayOop.hpp"
aoqi@0	32	#include "oops/typeArrayOop.hpp"
aoqi@0	33
aoqi@0	34	// ciArray
aoqi@0	35	//
aoqi@0	36	// This class represents an arrayOop in the HotSpot virtual
aoqi@0	37	// machine.
aoqi@0	38	static BasicType fixup_element_type(BasicType bt) {
aoqi@0	39	if (bt == T_ARRAY) return T_OBJECT;
aoqi@0	40	if (bt == T_BOOLEAN) return T_BYTE;
aoqi@0	41	return bt;
aoqi@0	42	}
aoqi@0	43
aoqi@0	44	ciConstant ciArray::element_value_impl(BasicType elembt,
aoqi@0	45	arrayOop ary,
aoqi@0	46	int index) {
aoqi@0	47	if (ary == NULL)
aoqi@0	48	return ciConstant();
aoqi@0	49	assert(ary->is_array(), "");
aoqi@0	50	if (index < 0 || index >= ary->length())
aoqi@0	51	return ciConstant();
aoqi@0	52	ArrayKlass* ak = (ArrayKlass*) ary->klass();
aoqi@0	53	BasicType abt = ak->element_type();
aoqi@0	54	if (fixup_element_type(elembt) !=
aoqi@0	55	fixup_element_type(abt))
aoqi@0	56	return ciConstant();
aoqi@0	57	switch (elembt) {
aoqi@0	58	case T_ARRAY:
aoqi@0	59	case T_OBJECT:
aoqi@0	60	{
aoqi@0	61	assert(ary->is_objArray(), "");
aoqi@0	62	objArrayOop objary = (objArrayOop) ary;
aoqi@0	63	oop elem = objary->obj_at(index);
aoqi@0	64	ciEnv* env = CURRENT_ENV;
aoqi@0	65	ciObject* box = env->get_object(elem);
aoqi@0	66	return ciConstant(T_OBJECT, box);
aoqi@0	67	}
aoqi@0	68	}
aoqi@0	69	assert(ary->is_typeArray(), "");
aoqi@0	70	typeArrayOop tary = (typeArrayOop) ary;
aoqi@0	71	jint value = 0;
aoqi@0	72	switch (elembt) {
aoqi@0	73	case T_LONG: return ciConstant(tary->long_at(index));
aoqi@0	74	case T_FLOAT: return ciConstant(tary->float_at(index));
aoqi@0	75	case T_DOUBLE: return ciConstant(tary->double_at(index));
aoqi@0	76	default: return ciConstant();
aoqi@0	77	case T_BYTE: value = tary->byte_at(index); break;
aoqi@0	78	case T_BOOLEAN: value = tary->byte_at(index) & 1; break;
aoqi@0	79	case T_SHORT: value = tary->short_at(index); break;
aoqi@0	80	case T_CHAR: value = tary->char_at(index); break;
aoqi@0	81	case T_INT: value = tary->int_at(index); break;
aoqi@0	82	}
aoqi@0	83	return ciConstant(elembt, value);
aoqi@0	84	}
aoqi@0	85
aoqi@0	86	// ------------------------------------------------------------------
aoqi@0	87	// ciArray::element_value
aoqi@0	88	//
aoqi@0	89	// Current value of an element.
aoqi@0	90	// Returns T_ILLEGAL if there is no element at the given index.
aoqi@0	91	ciConstant ciArray::element_value(int index) {
aoqi@0	92	BasicType elembt = element_basic_type();
aoqi@0	93	GUARDED_VM_ENTRY(
aoqi@0	94	return element_value_impl(elembt, get_arrayOop(), index);
aoqi@0	95	)
aoqi@0	96	}
aoqi@0	97
aoqi@0	98	// ------------------------------------------------------------------
aoqi@0	99	// ciArray::element_value_by_offset
aoqi@0	100	//
aoqi@0	101	// Current value of an element at the specified offset.
aoqi@0	102	// Returns T_ILLEGAL if there is no element at the given offset.
aoqi@0	103	ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
aoqi@0	104	BasicType elembt = element_basic_type();
aoqi@0	105	intptr_t shift = exact_log2(type2aelembytes(elembt));
aoqi@0	106	intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
aoqi@0	107	intptr_t index = (element_offset - header) >> shift;
aoqi@0	108	intptr_t offset = header + ((intptr_t)index << shift);
aoqi@0	109	if (offset != element_offset || index != (jint)index)
aoqi@0	110	return ciConstant();
aoqi@0	111	return element_value((jint) index);
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	// ------------------------------------------------------------------
aoqi@0	115	// ciArray::print_impl
aoqi@0	116	//
aoqi@0	117	// Implementation of the print method.
aoqi@0	118	void ciArray::print_impl(outputStream* st) {
aoqi@0	119	st->print(" length=%d type=", length());
aoqi@0	120	klass()->print(st);
aoqi@0	121	}