Mercurial > hg > graal-compiler
view src/share/vm/memory/permGen.cpp @ 2455:479b4b4b6950
6777083: assert(target != __null,"must not be null")
Reviewed-by: iveresov, kvn
author | never |
---|---|
date | Tue, 05 Apr 2011 00:31:09 -0700 |
parents | f95d63e2154a |
children |
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. * */ #include "precompiled.hpp" #include "gc_implementation/shared/cSpaceCounters.hpp" #include "gc_implementation/shared/vmGCOperations.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "memory/blockOffsetTable.inline.hpp" #include "memory/compactPermGen.hpp" #include "memory/gcLocker.hpp" #include "memory/gcLocker.inline.hpp" #include "memory/genCollectedHeap.hpp" #include "memory/generation.inline.hpp" #include "memory/permGen.hpp" #include "memory/universe.hpp" #include "oops/oop.inline.hpp" #include "runtime/java.hpp" #include "runtime/vmThread.hpp" HeapWord* PermGen::request_expand_and_allocate(Generation* gen, size_t size, GCCause::Cause prev_cause) { if (gen->capacity() < _capacity_expansion_limit || prev_cause != GCCause::_no_gc || UseG1GC) { // last disjunct is a temporary hack for G1 return gen->expand_and_allocate(size, false); } // We have reached the limit of capacity expansion where // we will not expand further until a GC is done; request denied. return NULL; } HeapWord* PermGen::mem_allocate_in_gen(size_t size, Generation* gen) { GCCause::Cause next_cause = GCCause::_permanent_generation_full; GCCause::Cause prev_cause = GCCause::_no_gc; unsigned int gc_count_before, full_gc_count_before; HeapWord* obj; for (;;) { { MutexLocker ml(Heap_lock); if ((obj = gen->allocate(size, false)) != NULL) { return obj; } // Attempt to expand and allocate the requested space: // specific subtypes may use specific policy to either expand // or not. The default policy (see above) is to expand until // _capacity_expansion_limit, and no further unless a GC is done. // Concurrent collectors may decide to kick off a concurrent // collection under appropriate conditions. obj = request_expand_and_allocate(gen, size, prev_cause); if (obj != NULL || prev_cause == GCCause::_last_ditch_collection) { return obj; } if (GC_locker::is_active_and_needs_gc()) { // If this thread is not in a jni critical section, we stall // the requestor until the critical section has cleared and // GC allowed. When the critical section clears, a GC is // initiated by the last thread exiting the critical section; so // we retry the allocation sequence from the beginning of the loop, // rather than causing more, now probably unnecessary, GC attempts. JavaThread* jthr = JavaThread::current(); if (!jthr->in_critical()) { MutexUnlocker mul(Heap_lock); // Wait for JNI critical section to be exited GC_locker::stall_until_clear(); continue; } else { if (CheckJNICalls) { fatal("Possible deadlock due to allocating while" " in jni critical section"); } return NULL; } } // Read the GC count while holding the Heap_lock gc_count_before = SharedHeap::heap()->total_collections(); full_gc_count_before = SharedHeap::heap()->total_full_collections(); } // Give up heap lock above, VMThread::execute below gets it back VM_GenCollectForPermanentAllocation op(size, gc_count_before, full_gc_count_before, next_cause); VMThread::execute(&op); if (!op.prologue_succeeded() || op.gc_locked()) { assert(op.result() == NULL, "must be NULL if gc_locked() is true"); continue; // retry and/or stall as necessary } obj = op.result(); assert(obj == NULL || SharedHeap::heap()->is_in_reserved(obj), "result not in heap"); if (obj != NULL) { return obj; } prev_cause = next_cause; next_cause = GCCause::_last_ditch_collection; } } CompactingPermGen::CompactingPermGen(ReservedSpace rs, ReservedSpace shared_rs, size_t initial_byte_size, GenRemSet* remset, PermanentGenerationSpec* perm_spec) { CompactingPermGenGen* g = new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset, NULL, perm_spec); if (g == NULL) vm_exit_during_initialization("Could not allocate a CompactingPermGen"); _gen = g; g->initialize_performance_counters(); _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion; } HeapWord* CompactingPermGen::mem_allocate(size_t size) { return mem_allocate_in_gen(size, _gen); } void CompactingPermGen::compute_new_size() { size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion); if (desired_capacity < PermSize) { desired_capacity = PermSize; } if (_gen->capacity() > desired_capacity) { _gen->shrink(_gen->capacity() - desired_capacity); } set_capacity_expansion_limit(_gen->capacity() + MaxPermHeapExpansion); }