| /* |
| * 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_method_type() 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; } |
| virtual void dump_replay_data(outputStream* st) { /* do nothing */ } |
| |
| // 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; |
| } |
| ciMethodType* as_method_type() { |
| assert(is_method_type(), "bad cast"); |
| return (ciMethodType*)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 |