jdk8-mips64-public/hotspot: src/share/vm/services/g1MemoryPool.cpp@17c778814856 (annotated)

src/share/vm/services/g1MemoryPool.cpp@17c778814856 (annotated)

src/share/vm/services/g1MemoryPool.cpp

Fri, 14 Jan 2011 13:47:53 -0500

author: coleenp
date: Fri, 14 Jan 2011 13:47:53 -0500
changeset 2463: 17c778814856
parent 2314: f95d63e2154a
child 2821: b52782ae3880
permissions: -rw-r--r--

6811367: Fix code in HeapDumper::dump_heap() to avoid buffer overrun
Summary: Check buffer size before using and use dynamic buffer sizes for subsequent calls.
Reviewed-by: kamg, dholmes

 /*
  * Copyright (c) 2007, 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.
  *
  */
 #include "precompiled.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
 #include "gc_implementation/g1/heapRegion.hpp"
 #include "services/g1MemoryPool.hpp"
 G1MemoryPoolSuper::G1MemoryPoolSuper(G1CollectedHeap* g1h,
                                      const char* name,
                                      size_t init_size,
                                      bool support_usage_threshold) :
   _g1h(g1h), CollectedMemoryPool(name,
                                  MemoryPool::Heap,
                                  init_size,
                                  undefined_max(),
                                  support_usage_threshold) {
   assert(UseG1GC, "sanity");
 }
 // See the comment at the top of g1MemoryPool.hpp
 size_t G1MemoryPoolSuper::eden_space_committed(G1CollectedHeap* g1h) {
   return MAX2(eden_space_used(g1h), (size_t) HeapRegion::GrainBytes);
 }
 // See the comment at the top of g1MemoryPool.hpp
 size_t G1MemoryPoolSuper::eden_space_used(G1CollectedHeap* g1h) {
   size_t young_list_length = g1h->young_list()->length();
   size_t eden_used = young_list_length * HeapRegion::GrainBytes;
   size_t survivor_used = survivor_space_used(g1h);
   eden_used = subtract_up_to_zero(eden_used, survivor_used);
   return eden_used;
 }
 // See the comment at the top of g1MemoryPool.hpp
 size_t G1MemoryPoolSuper::survivor_space_committed(G1CollectedHeap* g1h) {
   return MAX2(survivor_space_used(g1h), (size_t) HeapRegion::GrainBytes);
 }
 // See the comment at the top of g1MemoryPool.hpp
 size_t G1MemoryPoolSuper::survivor_space_used(G1CollectedHeap* g1h) {
   size_t survivor_num = g1h->g1_policy()->recorded_survivor_regions();
   size_t survivor_used = survivor_num * HeapRegion::GrainBytes;
   return survivor_used;
 }
 // See the comment at the top of g1MemoryPool.hpp
 size_t G1MemoryPoolSuper::old_space_committed(G1CollectedHeap* g1h) {
   size_t committed = overall_committed(g1h);
   size_t eden_committed = eden_space_committed(g1h);
   size_t survivor_committed = survivor_space_committed(g1h);
   committed = subtract_up_to_zero(committed, eden_committed);
   committed = subtract_up_to_zero(committed, survivor_committed);
   committed = MAX2(committed, (size_t) HeapRegion::GrainBytes);
   return committed;
 }
 // See the comment at the top of g1MemoryPool.hpp
 size_t G1MemoryPoolSuper::old_space_used(G1CollectedHeap* g1h) {
   size_t used = overall_used(g1h);
   size_t eden_used = eden_space_used(g1h);
   size_t survivor_used = survivor_space_used(g1h);
   used = subtract_up_to_zero(used, eden_used);
   used = subtract_up_to_zero(used, survivor_used);
   return used;
 }
 G1EdenPool::G1EdenPool(G1CollectedHeap* g1h) :
   G1MemoryPoolSuper(g1h,
                     "G1 Eden",
                     eden_space_committed(g1h), /* init_size */
                     false /* support_usage_threshold */) { }
 MemoryUsage G1EdenPool::get_memory_usage() {
   size_t initial_sz = initial_size();
   size_t max_sz     = max_size();
   size_t used       = used_in_bytes();
   size_t committed  = eden_space_committed(_g1h);
   return MemoryUsage(initial_sz, used, committed, max_sz);
 }
 G1SurvivorPool::G1SurvivorPool(G1CollectedHeap* g1h) :
   G1MemoryPoolSuper(g1h,
                     "G1 Survivor",
                     survivor_space_committed(g1h), /* init_size */
                     false /* support_usage_threshold */) { }
 MemoryUsage G1SurvivorPool::get_memory_usage() {
   size_t initial_sz = initial_size();
   size_t max_sz     = max_size();
   size_t used       = used_in_bytes();
   size_t committed  = survivor_space_committed(_g1h);
   return MemoryUsage(initial_sz, used, committed, max_sz);
 }
 G1OldGenPool::G1OldGenPool(G1CollectedHeap* g1h) :
   G1MemoryPoolSuper(g1h,
                     "G1 Old Gen",
                     old_space_committed(g1h), /* init_size */
                     true /* support_usage_threshold */) { }
 MemoryUsage G1OldGenPool::get_memory_usage() {
   size_t initial_sz = initial_size();
   size_t max_sz     = max_size();
   size_t used       = used_in_bytes();
   size_t committed  = old_space_committed(_g1h);
   return MemoryUsage(initial_sz, used, committed, max_sz);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/g1MemoryPool.cpp@17c778814856 (annotated)

src/share/vm/services/g1MemoryPool.cpp