Mercurial > hg > truffle
view src/share/vm/ci/ciArray.cpp @ 20282:f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
Summary: Added -XX:+/-ClassUnloadingWithConcurrentMark
Reviewed-by: jmasa, brutisso, mgerdin
author | stefank |
---|---|
date | Wed, 06 Aug 2014 09:55:16 +0200 |
parents | 55fb97c4c58d |
children | 4ca6dc0799b6 |
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/* * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "ci/ciArray.hpp" #include "ci/ciArrayKlass.hpp" #include "ci/ciConstant.hpp" #include "ci/ciKlass.hpp" #include "ci/ciUtilities.hpp" #include "oops/objArrayOop.hpp" #include "oops/typeArrayOop.hpp" // ciArray // // This class represents an arrayOop in the HotSpot virtual // machine. static BasicType fixup_element_type(BasicType bt) { if (bt == T_ARRAY) return T_OBJECT; if (bt == T_BOOLEAN) return T_BYTE; return bt; } ciConstant ciArray::element_value_impl(BasicType elembt, arrayOop ary, int index) { if (ary == NULL) return ciConstant(); assert(ary->is_array(), ""); if (index < 0 || index >= ary->length()) return ciConstant(); ArrayKlass* ak = (ArrayKlass*) ary->klass(); BasicType abt = ak->element_type(); if (fixup_element_type(elembt) != fixup_element_type(abt)) return ciConstant(); switch (elembt) { case T_ARRAY: case T_OBJECT: { assert(ary->is_objArray(), ""); objArrayOop objary = (objArrayOop) ary; oop elem = objary->obj_at(index); ciEnv* env = CURRENT_ENV; ciObject* box = env->get_object(elem); return ciConstant(T_OBJECT, box); } } assert(ary->is_typeArray(), ""); typeArrayOop tary = (typeArrayOop) ary; jint value = 0; switch (elembt) { case T_LONG: return ciConstant(tary->long_at(index)); case T_FLOAT: return ciConstant(tary->float_at(index)); case T_DOUBLE: return ciConstant(tary->double_at(index)); default: return ciConstant(); case T_BYTE: value = tary->byte_at(index); break; case T_BOOLEAN: value = tary->byte_at(index) & 1; break; case T_SHORT: value = tary->short_at(index); break; case T_CHAR: value = tary->char_at(index); break; case T_INT: value = tary->int_at(index); break; } return ciConstant(elembt, value); } // ------------------------------------------------------------------ // ciArray::element_value // // Current value of an element. // Returns T_ILLEGAL if there is no element at the given index. ciConstant ciArray::element_value(int index) { BasicType elembt = element_basic_type(); GUARDED_VM_ENTRY( return element_value_impl(elembt, get_arrayOop(), index); ) } // ------------------------------------------------------------------ // ciArray::element_value_by_offset // // Current value of an element at the specified offset. // Returns T_ILLEGAL if there is no element at the given offset. ciConstant ciArray::element_value_by_offset(intptr_t element_offset) { BasicType elembt = element_basic_type(); intptr_t shift = exact_log2(type2aelembytes(elembt)); intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt); intptr_t index = (element_offset - header) >> shift; intptr_t offset = header + ((intptr_t)index << shift); if (offset != element_offset || index != (jint)index) return ciConstant(); return element_value((jint) index); } // ------------------------------------------------------------------ // ciArray::print_impl // // Implementation of the print method. void ciArray::print_impl(outputStream* st) { st->print(" length=%d type=", length()); klass()->print(st); }