Mercurial > hg > graal-compiler
view src/share/vm/ci/ciObject.cpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | 06f017f7daa7 01fd6090fdd8 |
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/* * Copyright (c) 1999, 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 "ci/ciObject.hpp" #include "ci/ciUtilities.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "oops/oop.inline2.hpp" // ciObject // // This class represents an oop in the HotSpot virtual machine. // Its subclasses are structured in a hierarchy which mirrors // an aggregate of the VM's oop and klass hierarchies (see // oopHierarchy.hpp). Each instance of ciObject holds a handle // to a corresponding oop on the VM side and provides routines // for accessing the information in its oop. By using the ciObject // hierarchy for accessing oops in the VM, the compiler ensures // that it is safe with respect to garbage collection; that is, // GC and compilation can proceed independently without // interference. // // Within the VM, the oop and klass hierarchies are separate. // The compiler interface does not preserve this separation -- // the distinction between `klassOop' and `Klass' are not // reflected in the interface and instead the Klass hierarchy // is directly modeled as the subclasses of ciKlass. // ------------------------------------------------------------------ // ciObject::ciObject ciObject::ciObject(oop o) { ASSERT_IN_VM; if (ciObjectFactory::is_initialized()) { _handle = JNIHandles::make_local(o); } else { _handle = JNIHandles::make_global(o); } _klass = NULL; _ident = 0; init_flags_from(o); } // ------------------------------------------------------------------ // ciObject::ciObject // ciObject::ciObject(Handle h) { ASSERT_IN_VM; if (ciObjectFactory::is_initialized()) { _handle = JNIHandles::make_local(h()); } else { _handle = JNIHandles::make_global(h); } _klass = NULL; _ident = 0; init_flags_from(h()); } // ------------------------------------------------------------------ // ciObject::ciObject // // Unloaded klass/method variant. `klass' is the klass of the unloaded // klass/method, if that makes sense. ciObject::ciObject(ciKlass* klass) { ASSERT_IN_VM; assert(klass != NULL, "must supply klass"); _handle = NULL; _klass = klass; _ident = 0; } // ------------------------------------------------------------------ // ciObject::ciObject // // NULL variant. Used only by ciNullObject. ciObject::ciObject() { ASSERT_IN_VM; _handle = NULL; _klass = NULL; _ident = 0; } // ------------------------------------------------------------------ // ciObject::klass // // Get the ciKlass of this ciObject. ciKlass* ciObject::klass() { if (_klass == NULL) { if (_handle == NULL) { // When both _klass and _handle are NULL, we are dealing // with the distinguished instance of ciNullObject. // No one should ask it for its klass. assert(is_null_object(), "must be null object"); ShouldNotReachHere(); return NULL; } GUARDED_VM_ENTRY( oop o = get_oop(); _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); ); } return _klass; } // ------------------------------------------------------------------ // ciObject::set_ident // // Set the unique identity number of a ciObject. void ciObject::set_ident(uint id) { assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); _ident = _ident + (id << FLAG_BITS); } // ------------------------------------------------------------------ // ciObject::ident // // Report the unique identity number of a ciObject. uint ciObject::ident() { uint id = _ident >> FLAG_BITS; assert(id != 0, "must be initialized"); return id; } // ------------------------------------------------------------------ // ciObject::equals // // Are two ciObjects equal? bool ciObject::equals(ciObject* obj) { return (this == obj); } // ------------------------------------------------------------------ // ciObject::hash // // A hash value for the convenience of compilers. // // Implementation note: we use the address of the ciObject as the // basis for the hash. Use the _ident field, which is well-behaved. int ciObject::hash() { return ident() * 31; } // ------------------------------------------------------------------ // ciObject::constant_encoding // // The address which the compiler should embed into the // generated code to represent this oop. This address // is not the true address of the oop -- it will get patched // during nmethod creation. // // // // Implementation note: we use the handle as the encoding. The // nmethod constructor resolves the handle and patches in the oop. // // This method should be changed to return an generified address // to discourage use of the JNI handle. jobject ciObject::constant_encoding() { assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); assert(can_be_constant(), "oop must be NULL or perm"); return handle(); } // ------------------------------------------------------------------ // ciObject::can_be_constant bool ciObject::can_be_constant() { if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant return handle() == NULL || !is_scavengable(); } // ------------------------------------------------------------------ // ciObject::should_be_constant() bool ciObject::should_be_constant() { if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant return handle() == NULL || !is_scavengable(); } // ------------------------------------------------------------------ // ciObject::print // // Print debugging output about this ciObject. // // Implementation note: dispatch to the virtual print_impl behavior // for this ciObject. void ciObject::print(outputStream* st) { st->print("<%s", type_string()); GUARDED_VM_ENTRY(print_impl(st);) st->print(" ident=%d %s%s address=0x%x>", ident(), is_perm() ? "PERM" : "", is_scavengable() ? "SCAVENGABLE" : "", (address)this); } // ------------------------------------------------------------------ // ciObject::print_oop // // Print debugging output about the oop this ciObject represents. void ciObject::print_oop(outputStream* st) { if (is_null_object()) { st->print_cr("NULL"); } else if (!is_loaded()) { st->print_cr("UNLOADED"); } else { GUARDED_VM_ENTRY(get_oop()->print_on(st);) } }