Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/shared/spaceDecorator.hpp @ 12146:9758d9f36299
8021954: VM SIGSEGV during classloading on MacOS; hs_err_pid file produced
Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification
Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung
Contributed-by: lois.foltan@oracle.com
author | coleenp |
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date | Thu, 29 Aug 2013 18:56:29 -0400 |
parents | b9a9ed0f8eeb |
children | 63a4eb8bcd23 |
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/* * Copyright (c) 2002, 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_GC_IMPLEMENTATION_SHARED_SPACEDECORATOR_HPP #define SHARE_VM_GC_IMPLEMENTATION_SHARED_SPACEDECORATOR_HPP #include "gc_implementation/shared/mutableSpace.hpp" #include "memory/space.hpp" #include "utilities/globalDefinitions.hpp" class SpaceDecorator: public AllStatic { public: // Initialization flags. static const bool Clear = true; static const bool DontClear = false; static const bool Mangle = true; static const bool DontMangle = false; }; // Functionality for use with class Space and class MutableSpace. // The approach taken with the mangling is to mangle all // the space initially and then to mangle areas that have // been allocated since the last collection. Mangling is // done in the context of a generation and in the context // of a space. // The space in a generation is mangled when it is first // initialized and when the generation grows. The spaces // are not necessarily up-to-date when this mangling occurs // and the method mangle_region() is used. // After allocations have been done in a space, the space generally // need to be remangled. Remangling is only done on the // recently allocated regions in the space. Typically, that is // the region between the new top and the top just before a // garbage collection. // An exception to the usual mangling in a space is done when the // space is used for an extraordinary purpose. Specifically, when // to-space is used as scratch space for a mark-sweep-compact // collection. // Spaces are mangled after a collection. If the generation // grows after a collection, the added space is mangled as part of // the growth of the generation. No additional mangling is needed when the // spaces are resized after an expansion. // The class SpaceMangler keeps a pointer to the top of the allocated // area and provides the methods for doing the piece meal mangling. // Methods for doing sparces and full checking of the mangling are // included. The full checking is done if DEBUG_MANGLING is defined. // GenSpaceMangler is used with the GenCollectedHeap collectors and // MutableSpaceMangler is used with the ParallelScavengeHeap collectors. // These subclasses abstract the differences in the types of spaces used // by each heap. class SpaceMangler: public CHeapObj<mtGC> { friend class VMStructs; // High water mark for allocations. Typically, the space above // this point have been mangle previously and don't need to be // touched again. Space belows this point has been allocated // and remangling is needed between the current top and this // high water mark. HeapWord* _top_for_allocations; HeapWord* top_for_allocations() { return _top_for_allocations; } public: // Setting _top_for_allocations to NULL at initialization // makes it always below top so that mangling done as part // of the initialize() call of a space does nothing (as it // should since the mangling is done as part of the constructor // for the space. SpaceMangler() : _top_for_allocations(NULL) {} // Methods for top and end that delegate to the specific // space type. virtual HeapWord* top() const = 0; virtual HeapWord* end() const = 0; // Return true if q matches the mangled pattern. static bool is_mangled(HeapWord* q) PRODUCT_RETURN0; // Used to save the an address in a space for later use during mangling. void set_top_for_allocations(HeapWord* v); // Overwrites the unused portion of this space. // Mangle only the region not previously mangled [top, top_previously_mangled) void mangle_unused_area(); // Mangle all the unused region [top, end) void mangle_unused_area_complete(); // Do some sparse checking on the area that should have been mangled. void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN; // Do a complete check of the area that should be mangled. void check_mangled_unused_area_complete() PRODUCT_RETURN; // Mangle the MemRegion. This is a non-space specific mangler. It // is used during the initial mangling of a space before the space // is fully constructed. Also is used when a generation is expanded // and possibly before the spaces have been reshaped to to the new // size of the generation. static void mangle_region(MemRegion mr) PRODUCT_RETURN; }; class ContiguousSpace; // For use with GenCollectedHeap's class GenSpaceMangler: public SpaceMangler { ContiguousSpace* _sp; ContiguousSpace* sp() { return _sp; } HeapWord* top() const { return _sp->top(); } HeapWord* end() const { return _sp->end(); } public: GenSpaceMangler(ContiguousSpace* sp) : SpaceMangler(), _sp(sp) {} }; // For use with ParallelScavengeHeap's. class MutableSpaceMangler: public SpaceMangler { MutableSpace* _sp; MutableSpace* sp() { return _sp; } HeapWord* top() const { return _sp->top(); } HeapWord* end() const { return _sp->end(); } public: MutableSpaceMangler(MutableSpace* sp) : SpaceMangler(), _sp(sp) {} }; #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_SPACEDECORATOR_HPP