Mercurial > hg > graal-jvmci-8
diff src/share/vm/ci/ciObject.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 148e5441d916 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/ci/ciObject.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,260 @@ +/* + * Copyright 1999-2006 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. + * + */ + +// 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 = 1}; + enum { + PERM_FLAG = 1 + }; +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 set_perm() { + _ident |= PERM_FLAG; + } + + // 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. (I.e., is it null or perm?) + // If it does not have an encoding, the compiler is responsible for + // making other arrangements for dealing with the oop. + // See ciEnv::make_perm_array + bool has_encoding(); + + // 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; } + + // 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 encoding(); + + // What kind of ciObject is this? + virtual bool is_null_object() 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_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; + } + 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; + } + 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; + } + ciSymbolKlass* as_symbol_klass() { + assert(is_symbol_klass(), "bad cast"); + return (ciSymbolKlass*)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); +};