src/hotspot/share/gc/shared/collectedHeap.inline.hpp
author stefank
Fri, 04 May 2018 11:41:35 +0200
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8200729: Conditional compilation of GCs Reviewed-by: ehelin, coleenp, kvn, ihse
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/*
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 * Copyright (c) 2001, 2018, 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_SHARED_COLLECTEDHEAP_INLINE_HPP
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#define SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP
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#include "classfile/javaClasses.hpp"
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#include "gc/shared/allocTracer.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "gc/shared/threadLocalAllocBuffer.inline.hpp"
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#include "memory/universe.hpp"
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#include "oops/arrayOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/thread.inline.hpp"
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#include "services/lowMemoryDetector.hpp"
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#include "utilities/align.hpp"
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#include "utilities/copy.hpp"
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// Inline allocation implementations.
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void CollectedHeap::post_allocation_setup_common(Klass* klass,
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                                                 HeapWord* obj_ptr) {
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  post_allocation_setup_no_klass_install(klass, obj_ptr);
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  oop obj = (oop)obj_ptr;
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#if (INCLUDE_G1GC || INCLUDE_CMSGC)
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  // Need a release store to ensure array/class length, mark word, and
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  // object zeroing are visible before setting the klass non-NULL, for
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  // concurrent collectors.
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  obj->release_set_klass(klass);
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#else
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  obj->set_klass(klass);
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#endif
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}
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void CollectedHeap::post_allocation_setup_no_klass_install(Klass* klass,
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                                                           HeapWord* obj_ptr) {
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  oop obj = (oop)obj_ptr;
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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_raw(klass->prototype_header());
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  } else {
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    // May be bootstrapping
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    obj->set_mark_raw(markOopDesc::prototype());
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  }
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}
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// Support for jvmti and dtrace
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inline void post_allocation_notify(Klass* klass, oop obj, int size) {
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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, size);
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    }
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  }
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}
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void CollectedHeap::post_allocation_setup_obj(Klass* klass,
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                                              HeapWord* obj_ptr,
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                                              int size) {
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  post_allocation_setup_common(klass, obj_ptr);
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  oop obj = (oop)obj_ptr;
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  assert(Universe::is_bootstrapping() ||
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         !obj->is_array(), "must not be an array");
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  // notify jvmti and dtrace
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  post_allocation_notify(klass, obj, size);
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}
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void CollectedHeap::post_allocation_setup_class(Klass* klass,
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                                                HeapWord* obj_ptr,
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                                                int size) {
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  // Set oop_size field before setting the _klass field because a
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  // non-NULL _klass field indicates that the object is parsable by
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  // concurrent GC.
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  oop new_cls = (oop)obj_ptr;
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  assert(size > 0, "oop_size must be positive.");
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  java_lang_Class::set_oop_size(new_cls, size);
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  post_allocation_setup_common(klass, obj_ptr);
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  assert(Universe::is_bootstrapping() ||
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         !new_cls->is_array(), "must not be an array");
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  // notify jvmti and dtrace
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  post_allocation_notify(klass, new_cls, size);
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}
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void CollectedHeap::post_allocation_setup_array(Klass* klass,
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                                                HeapWord* obj_ptr,
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                                                int length) {
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  // Set array length before setting the _klass field because a
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  // non-NULL klass field indicates that the object is parsable by
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  // concurrent GC.
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  assert(length >= 0, "length should be non-negative");
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  ((arrayOop)obj_ptr)->set_length(length);
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  post_allocation_setup_common(klass, obj_ptr);
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  oop new_obj = (oop)obj_ptr;
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  assert(new_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, new_obj, new_obj->size());
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}
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HeapWord* CollectedHeap::common_mem_allocate_noinit(Klass* klass, 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 = allocate_from_tlab(klass, 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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    AllocTracer::send_allocation_outside_tlab(klass, result, size * HeapWordSize, THREAD);
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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(Klass* klass, size_t size, TRAPS) {
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  HeapWord* obj = common_mem_allocate_noinit(klass, 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(Klass* klass, 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(klass, 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(Klass* 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(klass, size, CHECK_NULL);
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  post_allocation_setup_obj(klass, obj, size);
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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::class_allocate(Klass* 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(klass, size, CHECK_NULL);
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  post_allocation_setup_class(klass, obj, size); // set oop_size
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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(Klass* 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(klass, 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(Klass* 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(klass, 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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inline HeapWord* CollectedHeap::align_allocation_or_fail(HeapWord* addr,
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                                                         HeapWord* end,
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                                                         unsigned short alignment_in_bytes) {
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  if (alignment_in_bytes <= ObjectAlignmentInBytes) {
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    return addr;
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  }
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  assert(is_aligned(addr, HeapWordSize),
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         "Address " PTR_FORMAT " is not properly aligned.", p2i(addr));
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  assert(is_aligned(alignment_in_bytes, HeapWordSize),
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         "Alignment size %u is incorrect.", alignment_in_bytes);
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  HeapWord* new_addr = align_up(addr, alignment_in_bytes);
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  size_t padding = pointer_delta(new_addr, addr);
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  if (padding == 0) {
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    return addr;
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  }
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  if (padding < CollectedHeap::min_fill_size()) {
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    padding += alignment_in_bytes / HeapWordSize;
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    assert(padding >= CollectedHeap::min_fill_size(),
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           "alignment_in_bytes %u is expect to be larger "
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           "than the minimum object size", alignment_in_bytes);
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    new_addr = addr + padding;
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  }
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  assert(new_addr > addr, "Unexpected arithmetic overflow "
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         PTR_FORMAT " not greater than " PTR_FORMAT, p2i(new_addr), p2i(addr));
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  if(new_addr < end) {
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    CollectedHeap::fill_with_object(addr, padding);
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    return new_addr;
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  } else {
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    return NULL;
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  }
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}
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#endif // SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP