jdk8-mips64-public/hotspot: src/share/vm/ci/ciObject.hpp@da91efe96a93 (annotated)

src/share/vm/ci/ciObject.hpp@da91efe96a93 (annotated)

src/share/vm/ci/ciObject.hpp

Sat, 01 Sep 2012 13:25:18 -0400

author: coleenp
date: Sat, 01 Sep 2012 13:25:18 -0400
changeset 4037: da91efe96a93
parent 3969: 1d7922586cf6
child 4133: f6b0eb4e44cf
permissions: -rw-r--r--

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

 /*
  * Copyright (c) 1999, 2012, 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.
  *
  */
 #ifndef SHARE_VM_CI_CIOBJECT_HPP
 #define SHARE_VM_CI_CIOBJECT_HPP
 #include "ci/ciBaseObject.hpp"
 #include "ci/ciClassList.hpp"
 #include "memory/allocation.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/jniHandles.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 `Klass*' and `Klass' are not
 // reflected in the interface and instead the Klass hierarchy
 // is directly modeled as the subclasses of ciKlass.
 class ciObject : public ciBaseObject {
   CI_PACKAGE_ACCESS
   friend class ciEnv;
 private:
   // A JNI handle referring to an oop in the VM.  This
   // handle may, in a small set of cases, correctly be NULL.
   jobject  _handle;
   ciKlass* _klass;
 protected:
   ciObject();
   ciObject(oop o);
   ciObject(Handle h);
   ciObject(ciKlass* klass);
   jobject      handle()  const { return _handle; }
   // Get the VM oop that this object holds.
   oop get_oop() const {
     assert(_handle != NULL, "null oop");
     return JNIHandles::resolve_non_null(_handle);
   }
   void init_flags_from(oop x);
   // Virtual behavior of the print() method.
   virtual void print_impl(outputStream* st) {}
   virtual const char* type_string() { return "ciObject"; }
 public:
   // The klass of this ciObject.
   ciKlass* klass();
   // Are two ciObjects equal?
   bool equals(ciObject* obj);
   // A hash value for the convenience of compilers.
   int hash();
   // Tells if this oop has an encoding as a constant.
   // True if is_perm is true.
   // Also true if ScavengeRootsInCode is non-zero.
   // If it does not have an encoding, the compiler is responsible for
   // making other arrangements for dealing with the oop.
   // See ciEnv::make_array
   bool can_be_constant();
   // Tells if this oop should be made a constant.
   // True if is_perm is true or ScavengeRootsInCode > 1.
   bool should_be_constant();
   // Might this object possibly move during a scavenge operation?
   // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code.
   bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; }
   // 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.
   //
   // Usage note: no address arithmetic allowed.  Oop must
   // be registered with the oopRecorder.
   jobject constant_encoding();
   virtual bool is_object() const            { return true; }
   // What kind of ciObject is this?
   virtual bool is_null_object()       const { return false; }
   virtual bool is_call_site()         const { return false; }
   virtual bool is_cpcache()           const { return false; }
   virtual bool is_instance()                { return false; }
   virtual bool is_member_name()       const { return false; }
   virtual bool is_method_handle()     const { return false; }
   virtual bool is_array()                   { return false; }
   virtual bool is_obj_array()               { return false; }
   virtual bool is_type_array()              { return false; }
   // Is this a type or value which has no associated class?
   // It is true of primitive types and null objects.
   virtual bool is_classless() const         { return false; }
   // Note: some ciObjects refer to oops which have yet to be created.
   // We refer to these as "unloaded".  Specifically, there are
   // unloaded instances of java.lang.Class,
   // java.lang.invoke.MethodHandle, and java.lang.invoke.MethodType.
   // By convention the ciNullObject is considered loaded, and
   // primitive types are considered loaded.
   bool is_loaded() const {
     return handle() != NULL || is_classless();
   }
   // Subclass casting with assertions.
   ciNullObject*            as_null_object() {
     assert(is_null_object(), "bad cast");
     return (ciNullObject*)this;
   }
   ciCallSite*              as_call_site() {
     assert(is_call_site(), "bad cast");
     return (ciCallSite*) this;
   }
   ciInstance*              as_instance() {
     assert(is_instance(), "bad cast");
     return (ciInstance*)this;
   }
   ciMemberName*            as_member_name() {
     assert(is_member_name(), "bad cast");
     return (ciMemberName*)this;
   }
   ciMethodHandle*          as_method_handle() {
     assert(is_method_handle(), "bad cast");
     return (ciMethodHandle*) this;
   }
   ciArray*                 as_array() {
     assert(is_array(), "bad cast");
     return (ciArray*)this;
   }
   ciObjArray*              as_obj_array() {
     assert(is_obj_array(), "bad cast");
     return (ciObjArray*)this;
   }
   ciTypeArray*             as_type_array() {
     assert(is_type_array(), "bad cast");
     return (ciTypeArray*)this;
   }
   // Print debugging output about this ciObject.
   void print(outputStream* st);
   void print() { print(tty); }  // GDB cannot handle default arguments
   // Print debugging output about the oop this ciObject represents.
   void print_oop(outputStream* st = tty);
 };
 #endif // SHARE_VM_CI_CIOBJECT_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciObject.hpp@da91efe96a93 (annotated)

src/share/vm/ci/ciObject.hpp