Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/permGen.hpp @ 3293:1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
Summary: In G1 heap verification, we no longer scan perm to G1-collected heap refs as part of process_strong_roots() but rather in a separate explicit oop iteration over the perm gen. This preserves the original perm card-marks. Added a new assertion in younger_refs_iterate() to catch a simple subcase where the user may have forgotten a prior save_marks() call, as happened in the case of G1's attempt to iterate perm to G1 refs when verifying the heap before exit. The assert was deliberately weakened for ParNew+CMS and will be fixed for that combination in a future CR. Also made some (non-G1) cleanups related to code and comments obsoleted by the migration of Symbols to the native heap.
Reviewed-by: iveresov, jmasa, tonyp
author | ysr |
---|---|
date | Tue, 26 Apr 2011 21:17:24 -0700 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
line wrap: on
line source
/* * Copyright (c) 2000, 2010, 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_MEMORY_PERMGEN_HPP #define SHARE_VM_MEMORY_PERMGEN_HPP #include "gc_interface/gcCause.hpp" #include "memory/generation.hpp" #include "memory/iterator.hpp" #include "runtime/handles.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/virtualspace.hpp" // All heaps contains a "permanent generation," containing permanent // (reflective) objects. This is like a regular generation in some ways, // but unlike one in others, and so is split apart. class Generation; class GenRemSet; class CSpaceCounters; // PermGen models the part of the heap used to allocate class meta-data. class PermGen : public CHeapObj { friend class VMStructs; protected: size_t _capacity_expansion_limit; // maximum expansion allowed without a // full gc occurring void set_capacity_expansion_limit(size_t limit) { assert_locked_or_safepoint(Heap_lock); _capacity_expansion_limit = limit; } HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); // Along with mem_allocate_in_gen() above, implements policy for // "scheduling" allocation/expansion/collection of the perm gen. // The virtual method request_...() below can be overridden by // subtypes that want to implement a different expansion/collection // policy from the default provided. virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size, GCCause::Cause prev_cause); public: enum Name { MarkSweepCompact, MarkSweep, ConcurrentMarkSweep }; // Permanent allocation (initialized) virtual HeapWord* mem_allocate(size_t size) = 0; // Mark sweep support virtual void compute_new_size() = 0; // Ideally, we would use MI (IMHO) but we'll do delegation instead. virtual Generation* as_gen() const = 0; virtual void oop_iterate(OopClosure* cl) { Generation* g = as_gen(); assert(g != NULL, "as_gen() NULL"); g->oop_iterate(cl); } virtual void object_iterate(ObjectClosure* cl) { Generation* g = as_gen(); assert(g != NULL, "as_gen() NULL"); g->object_iterate(cl); } // Performance Counter support virtual void update_counters() { Generation* g = as_gen(); assert(g != NULL, "as_gen() NULL"); g->update_counters(); } }; #endif // SHARE_VM_MEMORY_PERMGEN_HPP