jdk8-mips64-public/hotspot: src/share/vm/ci/ciObject.cpp@148e5441d916 (annotated)

src/share/vm/ci/ciObject.cpp@148e5441d916 (annotated)

src/share/vm/ci/ciObject.cpp

Tue, 15 Sep 2009 21:53:47 -0700

author: jrose
date: Tue, 15 Sep 2009 21:53:47 -0700
changeset 1424: 148e5441d916
parent 435: a61af66fc99e
child 1907: c18cbe5936b8
permissions: -rw-r--r--

6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr

 /*
  * Copyright 1999-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_ciObject.cpp.incl"
 // 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);)
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciObject.cpp@148e5441d916 (annotated)

src/share/vm/ci/ciObject.cpp