6655646: dynamic languages need dynamically linked call sites
Summary: invokedynamic instruction (JSR 292 RI)
Reviewed-by: twisti, never
/*
* Copyright 1997-2009 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.
*
*/
// An instanceKlass is the VM level representation of a Java class.
// It contains all information needed for at class at execution runtime.
// instanceKlass layout:
// [header ] klassOop
// [klass pointer ] klassOop
// [C++ vtbl pointer ] Klass
// [subtype cache ] Klass
// [instance size ] Klass
// [java mirror ] Klass
// [super ] Klass
// [access_flags ] Klass
// [name ] Klass
// [first subklass ] Klass
// [next sibling ] Klass
// [array klasses ]
// [methods ]
// [local interfaces ]
// [transitive interfaces ]
// [number of implementors ]
// [implementors ] klassOop[2]
// [fields ]
// [constants ]
// [class loader ]
// [protection domain ]
// [signers ]
// [source file name ]
// [inner classes ]
// [static field size ]
// [nonstatic field size ]
// [static oop fields size ]
// [nonstatic oop maps size ]
// [has finalize method ]
// [deoptimization mark bit ]
// [initialization state ]
// [initializing thread ]
// [Java vtable length ]
// [oop map cache (stack maps) ]
// [EMBEDDED Java vtable ] size in words = vtable_len
// [EMBEDDED static oop fields ] size in words = static_oop_fields_size
// [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size
// [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
//
// The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
// where oops are located in instances of this klass.
// forward declaration for class -- see below for definition
class SuperTypeClosure;
class OopMapBlock;
class JNIid;
class jniIdMapBase;
class BreakpointInfo;
class fieldDescriptor;
class DepChange;
class nmethodBucket;
class PreviousVersionNode;
class JvmtiCachedClassFieldMap;
// This is used in iterators below.
class FieldClosure: public StackObj {
public:
virtual void do_field(fieldDescriptor* fd) = 0;
};
#ifndef PRODUCT
// Print fields.
// If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
class FieldPrinter: public FieldClosure {
oop _obj;
outputStream* _st;
public:
FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
void do_field(fieldDescriptor* fd);
};
#endif // !PRODUCT
class instanceKlass: public Klass {
friend class VMStructs;
public:
// See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
// of the class loading & initialization procedure, and the use of the states.
enum ClassState {
unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
allocated, // allocated (but not yet linked)
loaded, // loaded and inserted in class hierarchy (but not linked yet)
linked, // successfully linked/verified (but not initialized yet)
being_initialized, // currently running class initializer
fully_initialized, // initialized (successfull final state)
initialization_error // error happened during initialization
};
public:
oop* oop_block_beg() const { return adr_array_klasses(); }
oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
enum {
implementors_limit = 2 // how many implems can we track?
};
protected:
//
// The oop block. See comment in klass.hpp before making changes.
//
// Array classes holding elements of this class.
klassOop _array_klasses;
// Method array.
objArrayOop _methods;
// Int array containing the original order of method in the class file (for
// JVMTI).
typeArrayOop _method_ordering;
// Interface (klassOops) this class declares locally to implement.
objArrayOop _local_interfaces;
// Interface (klassOops) this class implements transitively.
objArrayOop _transitive_interfaces;
// Instance and static variable information, 5-tuples of shorts [access, name
// index, sig index, initval index, offset].
typeArrayOop _fields;
// Constant pool for this class.
constantPoolOop _constants;
// Class loader used to load this class, NULL if VM loader used.
oop _class_loader;
// Protection domain.
oop _protection_domain;
// Host class, which grants its access privileges to this class also.
// This is only non-null for an anonymous class (AnonymousClasses enabled).
// The host class is either named, or a previously loaded anonymous class.
klassOop _host_klass;
// Class signers.
objArrayOop _signers;
// Name of source file containing this klass, NULL if not specified.
symbolOop _source_file_name;
// the source debug extension for this klass, NULL if not specified.
symbolOop _source_debug_extension;
// inner_classes attribute.
typeArrayOop _inner_classes;
// Implementors of this interface (not valid if it overflows)
klassOop _implementors[implementors_limit];
// Generic signature, or null if none.
symbolOop _generic_signature;
// invokedynamic bootstrap method (a java.dyn.MethodHandle)
oop _bootstrap_method;
// Annotations for this class, or null if none.
typeArrayOop _class_annotations;
// Annotation objects (byte arrays) for fields, or null if no annotations.
// Indices correspond to entries (not indices) in fields array.
objArrayOop _fields_annotations;
// Annotation objects (byte arrays) for methods, or null if no annotations.
// Index is the idnum, which is initially the same as the methods array index.
objArrayOop _methods_annotations;
// Annotation objects (byte arrays) for methods' parameters, or null if no
// such annotations.
// Index is the idnum, which is initially the same as the methods array index.
objArrayOop _methods_parameter_annotations;
// Annotation objects (byte arrays) for methods' default values, or null if no
// such annotations.
// Index is the idnum, which is initially the same as the methods array index.
objArrayOop _methods_default_annotations;
//
// End of the oop block.
//
// Number of heapOopSize words used by non-static fields in this klass
// (including inherited fields but after header_size()).
int _nonstatic_field_size;
int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
int _static_oop_field_size;// number of static oop fields in this klass
int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
bool _is_marked_dependent; // used for marking during flushing and deoptimization
bool _rewritten; // methods rewritten.
bool _has_nonstatic_fields; // for sizing with UseCompressedOops
u2 _minor_version; // minor version number of class file
u2 _major_version; // major version number of class file
ClassState _init_state; // state of class
Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
int _vtable_len; // length of Java vtable (in words)
int _itable_len; // length of Java itable (in words)
ReferenceType _reference_type; // reference type
OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
JNIid* _jni_ids; // First JNI identifier for static fields in this class
jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
nmethodBucket* _dependencies; // list of dependent nmethods
nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
int _nof_implementors; // No of implementors of this interface (zero if not an interface)
// Array of interesting part(s) of the previous version(s) of this
// instanceKlass. See PreviousVersionWalker below.
GrowableArray<PreviousVersionNode *>* _previous_versions;
u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
// JVMTI fields can be moved to their own structure - see 6315920
unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
jint _cached_class_file_len; // JVMTI: length of above
JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
// embedded Java vtable follows here
// embedded Java itables follows here
// embedded static fields follows here
// embedded nonstatic oop-map blocks follows here
friend class instanceKlassKlass;
friend class SystemDictionary;
public:
bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
// field sizes
int nonstatic_field_size() const { return _nonstatic_field_size; }
void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
int static_field_size() const { return _static_field_size; }
void set_static_field_size(int size) { _static_field_size = size; }
int static_oop_field_size() const { return _static_oop_field_size; }
void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
// Java vtable
int vtable_length() const { return _vtable_len; }
void set_vtable_length(int len) { _vtable_len = len; }
// Java itable
int itable_length() const { return _itable_len; }
void set_itable_length(int len) { _itable_len = len; }
// array klasses
klassOop array_klasses() const { return _array_klasses; }
void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
// methods
objArrayOop methods() const { return _methods; }
void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
methodOop method_with_idnum(int idnum);
// method ordering
typeArrayOop method_ordering() const { return _method_ordering; }
void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
// interfaces
objArrayOop local_interfaces() const { return _local_interfaces; }
void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
// fields
// Field info extracted from the class file and stored
// as an array of 7 shorts
enum FieldOffset {
access_flags_offset = 0,
name_index_offset = 1,
signature_index_offset = 2,
initval_index_offset = 3,
low_offset = 4,
high_offset = 5,
generic_signature_offset = 6,
next_offset = 7
};
typeArrayOop fields() const { return _fields; }
int offset_from_fields( int index ) const {
return build_int_from_shorts( fields()->ushort_at(index + low_offset),
fields()->ushort_at(index + high_offset) );
}
void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
// inner classes
typeArrayOop inner_classes() const { return _inner_classes; }
void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
enum InnerClassAttributeOffset {
// From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
inner_class_inner_class_info_offset = 0,
inner_class_outer_class_info_offset = 1,
inner_class_inner_name_offset = 2,
inner_class_access_flags_offset = 3,
inner_class_next_offset = 4
};
// method override check
bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS);
// package
bool is_same_class_package(klassOop class2);
bool is_same_class_package(oop classloader2, symbolOop classname2);
static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
// find an enclosing class (defined where original code was, in jvm.cpp!)
klassOop compute_enclosing_class(symbolOop& simple_name_result, TRAPS) {
instanceKlassHandle self(THREAD, this->as_klassOop());
return compute_enclosing_class_impl(self, simple_name_result, THREAD);
}
static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
symbolOop& simple_name_result, TRAPS);
// tell if two classes have the same enclosing class (at package level)
bool is_same_package_member(klassOop class2, TRAPS) {
instanceKlassHandle self(THREAD, this->as_klassOop());
return is_same_package_member_impl(self, class2, THREAD);
}
static bool is_same_package_member_impl(instanceKlassHandle self,
klassOop class2, TRAPS);
// initialization state
bool is_loaded() const { return _init_state >= loaded; }
bool is_linked() const { return _init_state >= linked; }
bool is_initialized() const { return _init_state == fully_initialized; }
bool is_not_initialized() const { return _init_state < being_initialized; }
bool is_being_initialized() const { return _init_state == being_initialized; }
bool is_in_error_state() const { return _init_state == initialization_error; }
bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
int get_init_state() { return _init_state; } // Useful for debugging
bool is_rewritten() const { return _rewritten; }
// marking
bool is_marked_dependent() const { return _is_marked_dependent; }
void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
// initialization (virtuals from Klass)
bool should_be_initialized() const; // means that initialize should be called
void initialize(TRAPS);
void link_class(TRAPS);
bool link_class_or_fail(TRAPS); // returns false on failure
void unlink_class();
void rewrite_class(TRAPS);
methodOop class_initializer();
// set the class to initialized if no static initializer is present
void eager_initialize(Thread *thread);
// reference type
ReferenceType reference_type() const { return _reference_type; }
void set_reference_type(ReferenceType t) { _reference_type = t; }
// find local field, returns true if found
bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
// find field in direct superinterfaces, returns the interface in which the field is defined
klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
// find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
// find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
// find a non-static or static field given its offset within the class.
bool contains_field_offset(int offset) {
return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
}
bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
// find a local method (returns NULL if not found)
methodOop find_method(symbolOop name, symbolOop signature) const;
static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
// lookup operation (returns NULL if not found)
methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
// lookup a method in all the interfaces that this class implements
// (returns NULL if not found)
methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
// constant pool
constantPoolOop constants() const { return _constants; }
void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
// class loader
oop class_loader() const { return _class_loader; }
void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
// protection domain
oop protection_domain() { return _protection_domain; }
void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
// host class
oop host_klass() const { return _host_klass; }
void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
bool is_anonymous() const { return _host_klass != NULL; }
// signers
objArrayOop signers() const { return _signers; }
void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
// source file name
symbolOop source_file_name() const { return _source_file_name; }
void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
// minor and major version numbers of class file
u2 minor_version() const { return _minor_version; }
void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
u2 major_version() const { return _major_version; }
void set_major_version(u2 major_version) { _major_version = major_version; }
// source debug extension
symbolOop source_debug_extension() const { return _source_debug_extension; }
void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
// nonstatic oop-map blocks
int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
// RedefineClasses() support for previous versions:
void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
int emcp_method_count);
bool has_previous_version() const;
void init_previous_versions() {
_previous_versions = NULL;
}
GrowableArray<PreviousVersionNode *>* previous_versions() const {
return _previous_versions;
}
// JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
void set_cached_class_file(unsigned char *class_file_bytes,
jint class_file_len) { _cached_class_file_len = class_file_len;
_cached_class_file_bytes = class_file_bytes; }
jint get_cached_class_file_len() { return _cached_class_file_len; }
unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
// JVMTI: Support for caching of field indices, types, and offsets
void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
_jvmti_cached_class_field_map = descriptor;
}
JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
return _jvmti_cached_class_field_map;
}
// for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
inline u2 next_method_idnum();
void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
// generics support
symbolOop generic_signature() const { return _generic_signature; }
void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
void set_enclosing_method_indices(u2 class_index,
u2 method_index) { _enclosing_method_class_index = class_index;
_enclosing_method_method_index = method_index; }
// JSR 292 support
oop bootstrap_method() const { return _bootstrap_method; }
void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); }
// jmethodID support
static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum,
jmethodID new_id, jmethodID* new_jmeths);
static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
jmethodID jmethod_id_or_null(methodOop method);
// cached itable index support
void set_cached_itable_index(size_t idnum, int index);
int cached_itable_index(size_t idnum);
// annotations support
typeArrayOop class_annotations() const { return _class_annotations; }
objArrayOop fields_annotations() const { return _fields_annotations; }
objArrayOop methods_annotations() const { return _methods_annotations; }
objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
typeArrayOop get_method_annotations_of(int idnum)
{ return get_method_annotations_from(idnum, _methods_annotations); }
typeArrayOop get_method_parameter_annotations_of(int idnum)
{ return get_method_annotations_from(idnum, _methods_parameter_annotations); }
typeArrayOop get_method_default_annotations_of(int idnum)
{ return get_method_annotations_from(idnum, _methods_default_annotations); }
void set_method_annotations_of(int idnum, typeArrayOop anno)
{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
void set_method_default_annotations_of(int idnum, typeArrayOop anno)
{ set_methods_annotations_of(idnum, anno, &_methods_annotations); }
// allocation
DEFINE_ALLOCATE_PERMANENT(instanceKlass);
instanceOop allocate_instance(TRAPS);
instanceOop allocate_permanent_instance(TRAPS);
// additional member function to return a handle
instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
objArrayOop allocate_objArray(int n, int length, TRAPS);
// Helper function
static instanceOop register_finalizer(instanceOop i, TRAPS);
// Check whether reflection/jni/jvm code is allowed to instantiate this class;
// if not, throw either an Error or an Exception.
virtual void check_valid_for_instantiation(bool throwError, TRAPS);
// initialization
void call_class_initializer(TRAPS);
void set_initialization_state_and_notify(ClassState state, TRAPS);
// OopMapCache support
OopMapCache* oop_map_cache() { return _oop_map_cache; }
void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
// JNI identifier support (for static fields - for jni performance)
JNIid* jni_ids() { return _jni_ids; }
void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
JNIid* jni_id_for(int offset);
// maintenance of deoptimization dependencies
int mark_dependent_nmethods(DepChange& changes);
void add_dependent_nmethod(nmethod* nm);
void remove_dependent_nmethod(nmethod* nm);
// On-stack replacement support
nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
void add_osr_nmethod(nmethod* n);
void remove_osr_nmethod(nmethod* n);
nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
// Breakpoint support (see methods on methodOop for details)
BreakpointInfo* breakpoints() const { return _breakpoints; };
void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
// support for stub routines
static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
// subclass/subinterface checks
bool implements_interface(klassOop k) const;
// Access to implementors of an interface. We only store the count
// of implementors, and in case, there are only a few
// implementors, we store them in a short list.
// This accessor returns NULL if we walk off the end of the list.
klassOop implementor(int i) const {
return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
}
int nof_implementors() const { return _nof_implementors; }
void add_implementor(klassOop k); // k is a new class that implements this interface
void init_implementor(); // initialize
// link this class into the implementors list of every interface it implements
void process_interfaces(Thread *thread);
// virtual operations from Klass
bool is_leaf_class() const { return _subklass == NULL; }
objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
bool compute_is_subtype_of(klassOop k);
bool can_be_primary_super_slow() const;
klassOop java_super() const { return super(); }
int oop_size(oop obj) const { return size_helper(); }
int klass_oop_size() const { return object_size(); }
bool oop_is_instance_slow() const { return true; }
// Iterators
void do_local_static_fields(FieldClosure* cl);
void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
void methods_do(void f(methodOop method));
void array_klasses_do(void f(klassOop k));
void with_array_klasses_do(void f(klassOop k));
bool super_types_do(SuperTypeClosure* blk);
// Casting from klassOop
static instanceKlass* cast(klassOop k) {
Klass* kp = k->klass_part();
assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
return (instanceKlass*) kp;
}
// Sizing (in words)
static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
static int vtable_start_offset() { return header_size(); }
static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
static int object_size(int extra) { return align_object_size(header_size() + extra); }
intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
// Static field offset is an offset into the Heap, should be converted by
// based on UseCompressedOop for traversal
HeapWord* start_of_static_fields() const {
return (HeapWord*)(start_of_itable() + align_object_offset(itable_length()));
}
intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
int offset_of_static_fields() const {
return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop();
}
OopMapBlock* start_of_nonstatic_oop_maps() const {
return (OopMapBlock*) (start_of_static_fields() + static_field_size());
}
// Allocation profiling support
juint alloc_size() const { return _alloc_count * size_helper(); }
void set_alloc_size(juint n) {}
// Use this to return the size of an instance in heap words:
int size_helper() const {
return layout_helper_to_size_helper(layout_helper());
}
// This bit is initialized in classFileParser.cpp.
// It is false under any of the following conditions:
// - the class is abstract (including any interface)
// - the class has a finalizer (if !RegisterFinalizersAtInit)
// - the class size is larger than FastAllocateSizeLimit
// - the class is java/lang/Class, which cannot be allocated directly
bool can_be_fastpath_allocated() const {
return !layout_helper_needs_slow_path(layout_helper());
}
// Java vtable/itable
klassVtable* vtable() const; // return new klassVtable wrapper
inline methodOop method_at_vtable(int index);
klassItable* itable() const; // return new klassItable wrapper
methodOop method_at_itable(klassOop holder, int index, TRAPS);
// Garbage collection
void oop_follow_contents(oop obj);
void follow_static_fields();
void adjust_static_fields();
int oop_adjust_pointers(oop obj);
bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
// Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
void follow_weak_klass_links(
BoolObjectClosure* is_alive, OopClosure* keep_alive);
void release_C_heap_structures();
// Parallel Scavenge and Parallel Old
PARALLEL_GC_DECLS
#ifndef SERIALGC
// Parallel Scavenge
void copy_static_fields(PSPromotionManager* pm);
void push_static_fields(PSPromotionManager* pm);
// Parallel Old
void follow_static_fields(ParCompactionManager* cm);
void copy_static_fields(ParCompactionManager* cm);
void update_static_fields();
void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
#endif // SERIALGC
// Naming
char* signature_name() const;
// Iterators
int oop_oop_iterate(oop obj, OopClosure* blk) {
return oop_oop_iterate_v(obj, blk);
}
int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
return oop_oop_iterate_v_m(obj, blk, mr);
}
#define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
MemRegion mr);
ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
#ifndef SERIALGC
#define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
#endif // !SERIALGC
void iterate_static_fields(OopClosure* closure);
void iterate_static_fields(OopClosure* closure, MemRegion mr);
private:
// initialization state
#ifdef ASSERT
void set_init_state(ClassState state);
#else
void set_init_state(ClassState state) { _init_state = state; }
#endif
void set_rewritten() { _rewritten = true; }
void set_init_thread(Thread *thread) { _init_thread = thread; }
u2 idnum_allocated_count() const { return _idnum_allocated_count; }
jmethodID* methods_jmethod_ids_acquire() const
{ return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
void release_set_methods_jmethod_ids(jmethodID* jmeths)
{ OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
int* methods_cached_itable_indices_acquire() const
{ return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
void release_set_methods_cached_itable_indices(int* indices)
{ OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
// Offsets for memory management
oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
oop* adr_methods() const { return (oop*)&this->_methods;}
oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
oop* adr_fields() const { return (oop*)&this->_fields;}
oop* adr_constants() const { return (oop*)&this->_constants;}
oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
oop* adr_signers() const { return (oop*)&this->_signers;}
oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;}
oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
// Static methods that are used to implement member methods where an exposed this pointer
// is needed due to possible GCs
static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
static void eager_initialize_impl (instanceKlassHandle this_oop);
static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
/* jni_id_for_impl for jfieldID only */
static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
// Returns the array class for the n'th dimension
klassOop array_klass_impl(bool or_null, int n, TRAPS);
// Returns the array class with this class as element type
klassOop array_klass_impl(bool or_null, TRAPS);
public:
// sharing support
virtual void remove_unshareable_info();
void field_names_and_sigs_iterate(OopClosure* closure);
// jvm support
jint compute_modifier_flags(TRAPS) const;
public:
// JVMTI support
jint jvmti_class_status() const;
#ifndef PRODUCT
public:
// Printing
void oop_print_on (oop obj, outputStream* st);
void oop_print_value_on(oop obj, outputStream* st);
void print_dependent_nmethods(bool verbose = false);
bool is_dependent_nmethod(nmethod* nm);
#endif
public:
// Verification
const char* internal_name() const;
void oop_verify_on(oop obj, outputStream* st);
#ifndef PRODUCT
static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
#endif
};
inline methodOop instanceKlass::method_at_vtable(int index) {
#ifndef PRODUCT
assert(index >= 0, "valid vtable index");
if (DebugVtables) {
verify_vtable_index(index);
}
#endif
vtableEntry* ve = (vtableEntry*)start_of_vtable();
return ve[index].method();
}
inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
if (annos == NULL || annos->length() <= idnum) {
return NULL;
}
return typeArrayOop(annos->obj_at(idnum));
}
// for adding methods
// UNSET_IDNUM return means no more ids available
inline u2 instanceKlass::next_method_idnum() {
if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
return constMethodOopDesc::UNSET_IDNUM; // no more ids available
} else {
return _idnum_allocated_count++;
}
}
// ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
class OopMapBlock VALUE_OBJ_CLASS_SPEC {
private:
jushort _offset; // Offset of first oop in oop-map block
jushort _length; // Length of oop-map block
public:
// Accessors
jushort offset() const { return _offset; }
void set_offset(jushort offset) { _offset = offset; }
jushort length() const { return _length; }
void set_length(jushort length) { _length = length; }
};
/* JNIid class for jfieldIDs only */
class JNIid: public CHeapObj {
friend class VMStructs;
private:
klassOop _holder;
JNIid* _next;
int _offset;
#ifdef ASSERT
bool _is_static_field_id;
#endif
public:
// Accessors
klassOop holder() const { return _holder; }
int offset() const { return _offset; }
JNIid* next() { return _next; }
// Constructor
JNIid(klassOop holder, int offset, JNIid* next);
// Identifier lookup
JNIid* find(int offset);
// Garbage collection support
oop* holder_addr() { return (oop*)&_holder; }
void oops_do(OopClosure* f);
static void deallocate(JNIid* id);
// Debugging
#ifdef ASSERT
bool is_static_field_id() const { return _is_static_field_id; }
void set_is_static_field_id() { _is_static_field_id = true; }
#endif
void verify(klassOop holder);
};
// If breakpoints are more numerous than just JVMTI breakpoints,
// consider compressing this data structure.
// It is currently a simple linked list defined in methodOop.hpp.
class BreakpointInfo;
// A collection point for interesting information about the previous
// version(s) of an instanceKlass. This class uses weak references to
// the information so that the information may be collected as needed
// by the system. If the information is shared, then a regular
// reference must be used because a weak reference would be seen as
// collectible. A GrowableArray of PreviousVersionNodes is attached
// to the instanceKlass as needed. See PreviousVersionWalker below.
class PreviousVersionNode : public CHeapObj {
private:
// A shared ConstantPool is never collected so we'll always have
// a reference to it so we can update items in the cache. We'll
// have a weak reference to a non-shared ConstantPool until all
// of the methods (EMCP or obsolete) have been collected; the
// non-shared ConstantPool becomes collectible at that point.
jobject _prev_constant_pool; // regular or weak reference
bool _prev_cp_is_weak; // true if not a shared ConstantPool
// If the previous version of the instanceKlass doesn't have any
// EMCP methods, then _prev_EMCP_methods will be NULL. If all the
// EMCP methods have been collected, then _prev_EMCP_methods can
// have a length of zero.
GrowableArray<jweak>* _prev_EMCP_methods;
public:
PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
GrowableArray<jweak>* prev_EMCP_methods);
~PreviousVersionNode();
jobject prev_constant_pool() const {
return _prev_constant_pool;
}
GrowableArray<jweak>* prev_EMCP_methods() const {
return _prev_EMCP_methods;
}
};
// A Handle-ized version of PreviousVersionNode.
class PreviousVersionInfo : public ResourceObj {
private:
constantPoolHandle _prev_constant_pool_handle;
// If the previous version of the instanceKlass doesn't have any
// EMCP methods, then _prev_EMCP_methods will be NULL. Since the
// methods cannot be collected while we hold a handle,
// _prev_EMCP_methods should never have a length of zero.
GrowableArray<methodHandle>* _prev_EMCP_method_handles;
public:
PreviousVersionInfo(PreviousVersionNode *pv_node);
~PreviousVersionInfo();
constantPoolHandle prev_constant_pool_handle() const {
return _prev_constant_pool_handle;
}
GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
return _prev_EMCP_method_handles;
}
};
// Helper object for walking previous versions. This helper cleans up
// the Handles that it allocates when the helper object is destroyed.
// The PreviousVersionInfo object returned by next_previous_version()
// is only valid until a subsequent call to next_previous_version() or
// the helper object is destroyed.
class PreviousVersionWalker : public StackObj {
private:
GrowableArray<PreviousVersionNode *>* _previous_versions;
int _current_index;
// Fields for cleaning up when we are done walking the previous versions:
// A HandleMark for the PreviousVersionInfo handles:
HandleMark _hm;
// It would be nice to have a ResourceMark field in this helper also,
// but the ResourceMark code says to be careful to delete handles held
// in GrowableArrays _before_ deleting the GrowableArray. Since we
// can't guarantee the order in which the fields are destroyed, we
// have to let the creator of the PreviousVersionWalker object do
// the right thing. Also, adding a ResourceMark here causes an
// include loop.
// A pointer to the current info object so we can handle the deletes.
PreviousVersionInfo * _current_p;
public:
PreviousVersionWalker(instanceKlass *ik);
~PreviousVersionWalker();
// Return the interesting information for the next previous version
// of the klass. Returns NULL if there are no more previous versions.
PreviousVersionInfo* next_previous_version();
};