author | coleenp |
Sat, 01 Sep 2012 13:25:18 -0400 | |
changeset 13728 | 882756847a04 |
parent 12236 | 51d6463cfd9d |
child 14583 | d70ee55535f4 |
child 14579 | 7f6ce6e3dd80 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP |
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#define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP |
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#include "gc_interface/collectedHeap.hpp" |
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#include "memory/threadLocalAllocBuffer.inline.hpp" |
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#include "memory/universe.hpp" |
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#include "oops/arrayOop.hpp" |
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#include "prims/jvmtiExport.hpp" |
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#include "runtime/sharedRuntime.hpp" |
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#include "runtime/thread.hpp" |
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#include "services/lowMemoryDetector.hpp" |
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#include "utilities/copy.hpp" |
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#ifdef TARGET_OS_FAMILY_linux |
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# include "thread_linux.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_solaris |
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# include "thread_solaris.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_windows |
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# include "thread_windows.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_bsd |
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# include "thread_bsd.inline.hpp" |
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#endif |
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// Inline allocation implementations. |
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void CollectedHeap::post_allocation_setup_common(KlassHandle klass, |
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HeapWord* obj) { |
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post_allocation_setup_no_klass_install(klass, obj); |
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post_allocation_install_obj_klass(klass, oop(obj)); |
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} |
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void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass, |
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HeapWord* objPtr) { |
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oop obj = (oop)objPtr; |
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assert(obj != NULL, "NULL object pointer"); |
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if (UseBiasedLocking && (klass() != NULL)) { |
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obj->set_mark(klass->prototype_header()); |
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} else { |
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// May be bootstrapping |
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obj->set_mark(markOopDesc::prototype()); |
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} |
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} |
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void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass, |
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oop obj) { |
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// These asserts are kind of complicated because of klassKlass |
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// and the beginning of the world. |
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assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass"); |
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assert(klass() == NULL || klass()->is_klass(), "not a klass"); |
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assert(obj != NULL, "NULL object pointer"); |
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obj->set_klass(klass()); |
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assert(!Universe::is_fully_initialized() || obj->klass() != NULL, |
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"missing klass"); |
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} |
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// Support for jvmti and dtrace |
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inline void post_allocation_notify(KlassHandle klass, oop obj) { |
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// support low memory notifications (no-op if not enabled) |
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LowMemoryDetector::detect_low_memory_for_collected_pools(); |
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// support for JVMTI VMObjectAlloc event (no-op if not enabled) |
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JvmtiExport::vm_object_alloc_event_collector(obj); |
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if (DTraceAllocProbes) { |
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// support for Dtrace object alloc event (no-op most of the time) |
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if (klass() != NULL && klass()->name() != NULL) { |
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SharedRuntime::dtrace_object_alloc(obj); |
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} |
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} |
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} |
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void CollectedHeap::post_allocation_setup_obj(KlassHandle klass, |
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HeapWord* obj) { |
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post_allocation_setup_common(klass, obj); |
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assert(Universe::is_bootstrapping() || |
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!((oop)obj)->is_array(), "must not be an array"); |
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// notify jvmti and dtrace |
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post_allocation_notify(klass, (oop)obj); |
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} |
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void CollectedHeap::post_allocation_setup_array(KlassHandle klass, |
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HeapWord* obj, |
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int length) { |
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// Set array length before setting the _klass field |
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// in post_allocation_setup_common() because the klass field |
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// indicates that the object is parsable by concurrent GC. |
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assert(length >= 0, "length should be non-negative"); |
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((arrayOop)obj)->set_length(length); |
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post_allocation_setup_common(klass, obj); |
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assert(((oop)obj)->is_array(), "must be an array"); |
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// notify jvmti and dtrace (must be after length is set for dtrace) |
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post_allocation_notify(klass, (oop)obj); |
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} |
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HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, TRAPS) { |
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// Clear unhandled oops for memory allocation. Memory allocation might |
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// not take out a lock if from tlab, so clear here. |
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CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();) |
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if (HAS_PENDING_EXCEPTION) { |
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NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); |
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return NULL; // caller does a CHECK_0 too |
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} |
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HeapWord* result = NULL; |
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if (UseTLAB) { |
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result = CollectedHeap::allocate_from_tlab(THREAD, size); |
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if (result != NULL) { |
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assert(!HAS_PENDING_EXCEPTION, |
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"Unexpected exception, will result in uninitialized storage"); |
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return result; |
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} |
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} |
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bool gc_overhead_limit_was_exceeded = false; |
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result = Universe::heap()->mem_allocate(size, |
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&gc_overhead_limit_was_exceeded); |
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if (result != NULL) { |
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NOT_PRODUCT(Universe::heap()-> |
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check_for_non_bad_heap_word_value(result, size)); |
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assert(!HAS_PENDING_EXCEPTION, |
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"Unexpected exception, will result in uninitialized storage"); |
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THREAD->incr_allocated_bytes(size * HeapWordSize); |
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return result; |
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} |
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if (!gc_overhead_limit_was_exceeded) { |
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// -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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report_java_out_of_memory("Java heap space"); |
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if (JvmtiExport::should_post_resource_exhausted()) { |
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JvmtiExport::post_resource_exhausted( |
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JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, |
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"Java heap space"); |
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} |
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THROW_OOP_0(Universe::out_of_memory_error_java_heap()); |
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} else { |
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// -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
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report_java_out_of_memory("GC overhead limit exceeded"); |
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if (JvmtiExport::should_post_resource_exhausted()) { |
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JvmtiExport::post_resource_exhausted( |
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JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, |
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"GC overhead limit exceeded"); |
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} |
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THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit()); |
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} |
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} |
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HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, TRAPS) { |
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HeapWord* obj = common_mem_allocate_noinit(size, CHECK_NULL); |
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init_obj(obj, size); |
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return obj; |
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} |
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HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) { |
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assert(UseTLAB, "should use UseTLAB"); |
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HeapWord* obj = thread->tlab().allocate(size); |
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if (obj != NULL) { |
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return obj; |
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} |
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// Otherwise... |
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return allocate_from_tlab_slow(thread, size); |
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} |
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void CollectedHeap::init_obj(HeapWord* obj, size_t size) { |
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assert(obj != NULL, "cannot initialize NULL object"); |
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const size_t hs = oopDesc::header_size(); |
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assert(size >= hs, "unexpected object size"); |
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((oop)obj)->set_klass_gap(0); |
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Copy::fill_to_aligned_words(obj + hs, size - hs); |
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} |
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oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) { |
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debug_only(check_for_valid_allocation_state()); |
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assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); |
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assert(size >= 0, "int won't convert to size_t"); |
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HeapWord* obj = common_mem_allocate_init(size, CHECK_NULL); |
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post_allocation_setup_obj(klass, obj); |
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NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); |
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return (oop)obj; |
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} |
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oop CollectedHeap::array_allocate(KlassHandle klass, |
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int size, |
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int length, |
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TRAPS) { |
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debug_only(check_for_valid_allocation_state()); |
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assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); |
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assert(size >= 0, "int won't convert to size_t"); |
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HeapWord* obj = common_mem_allocate_init(size, CHECK_NULL); |
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post_allocation_setup_array(klass, obj, length); |
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NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); |
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return (oop)obj; |
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} |
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oop CollectedHeap::array_allocate_nozero(KlassHandle klass, |
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int size, |
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int length, |
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TRAPS) { |
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debug_only(check_for_valid_allocation_state()); |
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assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); |
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assert(size >= 0, "int won't convert to size_t"); |
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HeapWord* obj = common_mem_allocate_noinit(size, CHECK_NULL); |
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((oop)obj)->set_klass_gap(0); |
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post_allocation_setup_array(klass, obj, length); |
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#ifndef PRODUCT |
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const size_t hs = oopDesc::header_size()+1; |
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Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs); |
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#endif |
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return (oop)obj; |
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} |
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// Returns "TRUE" if "p" is a method oop in the |
246 |
// current heap with high probability. NOTE: The main |
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// current consumers of this interface are Forte:: |
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// and ThreadProfiler::. In these cases, the |
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// interpreter frame from which "p" came, may be |
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// under construction when sampled asynchronously, so |
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// the clients want to check that it represents a |
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// valid method before using it. Nonetheless since |
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// the clients do not typically lock out GC, the |
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// predicate is_valid_method() is not stable, so |
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// it is possible that by the time "p" is used, it |
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// is no longer valid. |
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inline bool CollectedHeap::is_valid_method(Method* p) const { |
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return |
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p != NULL && |
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// Check whether "method" is metadata |
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p->is_metadata() && |
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// See if GC is active; however, there is still an |
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// apparently unavoidable window after this call |
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// and before the client of this interface uses "p". |
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// If the client chooses not to lock out GC, then |
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// it's a risk the client must accept. |
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!is_gc_active() && |
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// Check that p is a Method*. |
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p->is_method(); |
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} |
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inline void CollectedHeap::oop_iterate_no_header(OopClosure* cl) { |
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NoHeaderExtendedOopClosure no_header_cl(cl); |
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oop_iterate(&no_header_cl); |
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} |
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#ifndef PRODUCT |
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inline bool |
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CollectedHeap::promotion_should_fail(volatile size_t* count) { |
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// Access to count is not atomic; the value does not have to be exact. |
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if (PromotionFailureALot) { |
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const size_t gc_num = total_collections(); |
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const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number; |
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if (elapsed_gcs >= PromotionFailureALotInterval) { |
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// Test for unsigned arithmetic wrap-around. |
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if (++*count >= PromotionFailureALotCount) { |
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*count = 0; |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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inline bool CollectedHeap::promotion_should_fail() { |
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return promotion_should_fail(&_promotion_failure_alot_count); |
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} |
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inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) { |
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if (PromotionFailureALot) { |
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_promotion_failure_alot_gc_number = total_collections(); |
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*count = 0; |
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} |
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} |
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inline void CollectedHeap::reset_promotion_should_fail() { |
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reset_promotion_should_fail(&_promotion_failure_alot_count); |
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} |
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#endif // #ifndef PRODUCT |
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#endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP |