250 lines
7.9 KiB
C++
250 lines
7.9 KiB
C++
/*
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* Copyright (c) 1999, 2010, 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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#include "precompiled.hpp"
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#include "ci/ciObject.hpp"
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#include "ci/ciUtilities.hpp"
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#include "gc_interface/collectedHeap.inline.hpp"
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#include "oops/oop.inline2.hpp"
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// ciObject
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//
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// This class represents an oop in the HotSpot virtual machine.
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// Its subclasses are structured in a hierarchy which mirrors
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// an aggregate of the VM's oop and klass hierarchies (see
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// oopHierarchy.hpp). Each instance of ciObject holds a handle
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// to a corresponding oop on the VM side and provides routines
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// for accessing the information in its oop. By using the ciObject
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// hierarchy for accessing oops in the VM, the compiler ensures
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// that it is safe with respect to garbage collection; that is,
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// GC and compilation can proceed independently without
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// interference.
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//
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// Within the VM, the oop and klass hierarchies are separate.
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// The compiler interface does not preserve this separation --
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// the distinction between `klassOop' and `Klass' are not
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// reflected in the interface and instead the Klass hierarchy
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// is directly modeled as the subclasses of ciKlass.
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// ------------------------------------------------------------------
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// ciObject::ciObject
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ciObject::ciObject(oop o) {
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ASSERT_IN_VM;
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if (ciObjectFactory::is_initialized()) {
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_handle = JNIHandles::make_local(o);
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} else {
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_handle = JNIHandles::make_global(o);
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}
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_klass = NULL;
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_ident = 0;
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init_flags_from(o);
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}
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// ------------------------------------------------------------------
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// ciObject::ciObject
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//
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ciObject::ciObject(Handle h) {
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ASSERT_IN_VM;
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if (ciObjectFactory::is_initialized()) {
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_handle = JNIHandles::make_local(h());
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} else {
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_handle = JNIHandles::make_global(h);
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}
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_klass = NULL;
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_ident = 0;
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init_flags_from(h());
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}
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// ------------------------------------------------------------------
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// ciObject::ciObject
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//
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// Unloaded klass/method variant. `klass' is the klass of the unloaded
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// klass/method, if that makes sense.
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ciObject::ciObject(ciKlass* klass) {
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ASSERT_IN_VM;
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assert(klass != NULL, "must supply klass");
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_handle = NULL;
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_klass = klass;
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_ident = 0;
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}
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// ------------------------------------------------------------------
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// ciObject::ciObject
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//
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// NULL variant. Used only by ciNullObject.
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ciObject::ciObject() {
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ASSERT_IN_VM;
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_handle = NULL;
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_klass = NULL;
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_ident = 0;
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}
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// ------------------------------------------------------------------
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// ciObject::klass
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//
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// Get the ciKlass of this ciObject.
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ciKlass* ciObject::klass() {
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if (_klass == NULL) {
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if (_handle == NULL) {
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// When both _klass and _handle are NULL, we are dealing
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// with the distinguished instance of ciNullObject.
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// No one should ask it for its klass.
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assert(is_null_object(), "must be null object");
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ShouldNotReachHere();
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return NULL;
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}
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GUARDED_VM_ENTRY(
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oop o = get_oop();
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_klass = CURRENT_ENV->get_object(o->klass())->as_klass();
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);
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}
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return _klass;
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}
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// ------------------------------------------------------------------
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// ciObject::set_ident
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//
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// Set the unique identity number of a ciObject.
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void ciObject::set_ident(uint id) {
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assert((_ident >> FLAG_BITS) == 0, "must only initialize once");
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assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big");
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_ident = _ident + (id << FLAG_BITS);
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}
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// ------------------------------------------------------------------
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// ciObject::ident
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//
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// Report the unique identity number of a ciObject.
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uint ciObject::ident() {
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uint id = _ident >> FLAG_BITS;
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assert(id != 0, "must be initialized");
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return id;
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}
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// ------------------------------------------------------------------
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// ciObject::equals
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//
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// Are two ciObjects equal?
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bool ciObject::equals(ciObject* obj) {
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return (this == obj);
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}
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// ------------------------------------------------------------------
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// ciObject::hash
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//
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// A hash value for the convenience of compilers.
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//
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// Implementation note: we use the address of the ciObject as the
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// basis for the hash. Use the _ident field, which is well-behaved.
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int ciObject::hash() {
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return ident() * 31;
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}
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// ------------------------------------------------------------------
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// ciObject::constant_encoding
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//
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// The address which the compiler should embed into the
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// generated code to represent this oop. This address
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// is not the true address of the oop -- it will get patched
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// during nmethod creation.
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//
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//
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//
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// Implementation note: we use the handle as the encoding. The
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// nmethod constructor resolves the handle and patches in the oop.
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//
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// This method should be changed to return an generified address
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// to discourage use of the JNI handle.
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jobject ciObject::constant_encoding() {
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assert(is_null_object() || handle() != NULL, "cannot embed null pointer");
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assert(can_be_constant(), "oop must be NULL or perm");
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return handle();
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}
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// ------------------------------------------------------------------
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// ciObject::can_be_constant
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bool ciObject::can_be_constant() {
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if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant
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return handle() == NULL || is_perm();
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}
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// ------------------------------------------------------------------
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// ciObject::should_be_constant()
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bool ciObject::should_be_constant() {
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if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant
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if (is_null_object()) return true;
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ciEnv* env = CURRENT_ENV;
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if (!JavaObjectsInPerm) {
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// We want Strings and Classes to be embeddable by default since
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// they used to be in the perm world. Not all Strings used to be
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// embeddable but there's no easy way to distinguish the interned
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// from the regulars ones so just treat them all that way.
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if (klass() == env->String_klass() || klass() == env->Class_klass()) {
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return true;
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}
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}
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if (EnableInvokeDynamic &&
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(klass()->is_subclass_of(env->MethodHandle_klass()) ||
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klass()->is_subclass_of(env->CallSite_klass()))) {
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assert(ScavengeRootsInCode >= 1, "must be");
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// We want to treat these aggressively.
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return true;
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}
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return handle() == NULL || is_perm();
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}
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// ------------------------------------------------------------------
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// ciObject::print
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//
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// Print debugging output about this ciObject.
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//
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// Implementation note: dispatch to the virtual print_impl behavior
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// for this ciObject.
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void ciObject::print(outputStream* st) {
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st->print("<%s", type_string());
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GUARDED_VM_ENTRY(print_impl(st);)
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st->print(" ident=%d %s%s address=0x%x>", ident(),
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is_perm() ? "PERM" : "",
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is_scavengable() ? "SCAVENGABLE" : "",
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(address)this);
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}
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// ------------------------------------------------------------------
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// ciObject::print_oop
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//
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// Print debugging output about the oop this ciObject represents.
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void ciObject::print_oop(outputStream* st) {
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if (is_null_object()) {
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st->print_cr("NULL");
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} else if (!is_loaded()) {
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st->print_cr("UNLOADED");
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} else {
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GUARDED_VM_ENTRY(get_oop()->print_on(st);)
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}
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}
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