jdk8-mips64-public/hotspot: src/share/vm/ci/ciObject.hpp@5eb9169b1a14 (annotated)

src/share/vm/ci/ciObject.hpp@5eb9169b1a14 (annotated)

src/share/vm/ci/ciObject.hpp

Wed, 12 Oct 2011 21:00:13 -0700

author: twisti
date: Wed, 12 Oct 2011 21:00:13 -0700
changeset 3197: 5eb9169b1a14
parent 2933: 28a9fe9534ea
child 3969: 1d7922586cf6
permissions: -rw-r--r--

7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never

 /*
  * Copyright (c) 1999, 2011, 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/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 `klassOop' and `Klass' are not
 // reflected in the interface and instead the Klass hierarchy
 // is directly modeled as the subclasses of ciKlass.
 class ciObject : public ResourceObj {
   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;
   uint     _ident;
   enum { FLAG_BITS   = 2 };
   enum {
          PERM_FLAG        = 1,
          SCAVENGABLE_FLAG = 2
        };
 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) {
     int flags = 0;
     if (x != NULL) {
       if (x->is_perm())
         flags |= PERM_FLAG;
       if (x->is_scavengable())
         flags |= SCAVENGABLE_FLAG;
     }
     _ident |= flags;
   }
   // Virtual behavior of the print() method.
   virtual void print_impl(outputStream* st) {}
   virtual const char* type_string() { return "ciObject"; }
   void set_ident(uint id);
 public:
   // The klass of this ciObject.
   ciKlass* klass();
   // A number unique to this object.
   uint ident();
   // 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();
   // Is this object guaranteed to be in the permanent part of the heap?
   // If so, CollectedHeap::can_elide_permanent_oop_store_barriers is relevant.
   // If the answer is false, no guarantees are made.
   bool is_perm() { return (_ident & PERM_FLAG) != 0; }
   // 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();
   // 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_method()                  { return false; }
   virtual bool is_method_data()             { 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; }
   virtual bool is_symbol()                  { return false; }
   virtual bool is_type()                    { return false; }
   virtual bool is_return_address()          { return false; }
   virtual bool is_klass()                   { return false; }
   virtual bool is_instance_klass()          { return false; }
   virtual bool is_method_klass()            { return false; }
   virtual bool is_array_klass()             { return false; }
   virtual bool is_obj_array_klass()         { return false; }
   virtual bool is_type_array_klass()        { return false; }
   virtual bool is_symbol_klass()            { return false; }
   virtual bool is_klass_klass()             { return false; }
   virtual bool is_instance_klass_klass()    { return false; }
   virtual bool is_array_klass_klass()       { return false; }
   virtual bool is_obj_array_klass_klass()   { return false; }
   virtual bool is_type_array_klass_klass()  { 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; }
   // Is this ciObject a Java Language Object?  That is,
   // is the ciObject an instance or an array
   virtual bool is_java_object()             { return false; }
   // Does this ciObject represent a Java Language class?
   // That is, is the ciObject an instanceKlass or arrayKlass?
   virtual bool is_java_klass()              { return false; }
   // Is this ciObject the ciInstanceKlass representing
   // java.lang.Object()?
   virtual bool is_java_lang_Object()        { return false; }
   // Does this ciObject refer to a real oop in the VM?
   //
   // Note: some ciObjects refer to oops which have yet to be
   // created.  We refer to these as "unloaded".  Specifically,
   // there are unloaded ciMethods, ciObjArrayKlasses, and
   // ciInstanceKlasses.  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;
   }
   ciCPCache*               as_cpcache() {
     assert(is_cpcache(), "bad cast");
     return (ciCPCache*) this;
   }
   ciInstance*              as_instance() {
     assert(is_instance(), "bad cast");
     return (ciInstance*)this;
   }
   ciMethod*                as_method() {
     assert(is_method(), "bad cast");
     return (ciMethod*)this;
   }
   ciMethodData*            as_method_data() {
     assert(is_method_data(), "bad cast");
     return (ciMethodData*)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;
   }
   ciSymbol*                as_symbol() {
     assert(is_symbol(), "bad cast");
     return (ciSymbol*)this;
   }
   ciType*                  as_type() {
     assert(is_type(), "bad cast");
     return (ciType*)this;
   }
   ciReturnAddress*         as_return_address() {
     assert(is_return_address(), "bad cast");
     return (ciReturnAddress*)this;
   }
   ciKlass*                 as_klass() {
     assert(is_klass(), "bad cast");
     return (ciKlass*)this;
   }
   ciInstanceKlass*         as_instance_klass() {
     assert(is_instance_klass(), "bad cast");
     return (ciInstanceKlass*)this;
   }
   ciMethodKlass*           as_method_klass() {
     assert(is_method_klass(), "bad cast");
     return (ciMethodKlass*)this;
   }
   ciArrayKlass*            as_array_klass() {
     assert(is_array_klass(), "bad cast");
     return (ciArrayKlass*)this;
   }
   ciObjArrayKlass*         as_obj_array_klass() {
     assert(is_obj_array_klass(), "bad cast");
     return (ciObjArrayKlass*)this;
   }
   ciTypeArrayKlass*        as_type_array_klass() {
     assert(is_type_array_klass(), "bad cast");
     return (ciTypeArrayKlass*)this;
   }
   ciKlassKlass*            as_klass_klass() {
     assert(is_klass_klass(), "bad cast");
     return (ciKlassKlass*)this;
   }
   ciInstanceKlassKlass*    as_instance_klass_klass() {
     assert(is_instance_klass_klass(), "bad cast");
     return (ciInstanceKlassKlass*)this;
   }
   ciArrayKlassKlass*       as_array_klass_klass() {
     assert(is_array_klass_klass(), "bad cast");
     return (ciArrayKlassKlass*)this;
   }
   ciObjArrayKlassKlass*    as_obj_array_klass_klass() {
     assert(is_obj_array_klass_klass(), "bad cast");
     return (ciObjArrayKlassKlass*)this;
   }
   ciTypeArrayKlassKlass*   as_type_array_klass_klass() {
     assert(is_type_array_klass_klass(), "bad cast");
     return (ciTypeArrayKlassKlass*)this;
   }
   // Print debugging output about this ciObject.
   void print(outputStream* st = tty);
   // 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@5eb9169b1a14 (annotated)

src/share/vm/ci/ciObject.hpp