Mercurial > hg > graal-compiler
view src/share/vm/oops/objArrayOop.hpp @ 7630:5ce621176715
8004903: VMThread::execute() calls Thread::check_for_valid_safepoint_state() on concurrent VM ops
Summary: check_for_valid_safepoint_state() only applies to blocking VM ops
Reviewed-by: acorn, dholmes, dice, sspitsyn
Contributed-by: karen.kinnear@oracle.com
author | dcubed |
---|---|
date | Tue, 22 Jan 2013 05:57:18 -0800 |
parents | b9a9ed0f8eeb |
children | f31986da9319 |
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/* * Copyright (c) 1997, 2012, 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. * */ #ifndef SHARE_VM_OOPS_OBJARRAYOOP_HPP #define SHARE_VM_OOPS_OBJARRAYOOP_HPP #include "oops/arrayOop.hpp" // An objArrayOop is an array containing oops. // Evaluating "String arg[10]" will create an objArrayOop. class objArrayOopDesc : public arrayOopDesc { friend class ObjArrayKlass; friend class Runtime1; friend class psPromotionManager; friend class CSetMarkOopClosure; friend class G1ParScanPartialArrayClosure; template <class T> T* obj_at_addr(int index) const { assert(is_within_bounds(index), "index out of bounds"); return &((T*)base())[index]; } private: // Give size of objArrayOop in HeapWords minus the header static int array_size(int length) { const int OopsPerHeapWord = HeapWordSize/heapOopSize; assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0), "Else the following (new) computation would be in error"); #ifdef ASSERT // The old code is left in for sanity-checking; it'll // go away pretty soon. XXX // Without UseCompressedOops, this is simply: // oop->length() * HeapWordsPerOop; // With narrowOops, HeapWordsPerOop is 1/2 or equal 0 as an integer. // The oop elements are aligned up to wordSize const int HeapWordsPerOop = heapOopSize/HeapWordSize; int old_res; if (HeapWordsPerOop > 0) { old_res = length * HeapWordsPerOop; } else { old_res = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord; } #endif // ASSERT int res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord; assert(res == old_res, "Inconsistency between old and new."); return res; } public: // Returns the offset of the first element. static int base_offset_in_bytes() { return arrayOopDesc::base_offset_in_bytes(T_OBJECT); } // base is the address following the header. HeapWord* base() const { return (HeapWord*) arrayOopDesc::base(T_OBJECT); } // Accessing oop obj_at(int index) const { // With UseCompressedOops decode the narrow oop in the objArray to an // uncompressed oop. Otherwise this is simply a "*" operator. if (UseCompressedOops) { return load_decode_heap_oop(obj_at_addr<narrowOop>(index)); } else { return load_decode_heap_oop(obj_at_addr<oop>(index)); } } void obj_at_put(int index, oop value) { if (UseCompressedOops) { oop_store(obj_at_addr<narrowOop>(index), value); } else { oop_store(obj_at_addr<oop>(index), value); } } // Sizing static int header_size() { return arrayOopDesc::header_size(T_OBJECT); } int object_size() { return object_size(length()); } static int object_size(int length) { // This returns the object size in HeapWords. uint asz = array_size(length); uint osz = align_object_size(header_size() + asz); assert(osz >= asz, "no overflow"); assert((int)osz > 0, "no overflow"); return (int)osz; } // special iterators for index ranges, returns size of object #define ObjArrayOop_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ int oop_iterate_range(OopClosureType* blk, int start, int end); ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayOop_OOP_ITERATE_DECL) ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayOop_OOP_ITERATE_DECL) }; #endif // SHARE_VM_OOPS_OBJARRAYOOP_HPP