JDK14/Java14源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
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*
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* 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).
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef SHARE_OOPS_INSTANCEKLASS_HPP
#define SHARE_OOPS_INSTANCEKLASS_HPP
#include "classfile/classLoaderData.hpp"
#include "memory/referenceType.hpp"
#include "oops/annotations.hpp"
#include "oops/constMethod.hpp"
#include "oops/fieldInfo.hpp"
#include "oops/instanceOop.hpp"
#include "oops/klassVtable.hpp"
#include "runtime/handles.hpp"
#include "runtime/os.hpp"
#include "utilities/accessFlags.hpp"
#include "utilities/align.hpp"
#include "utilities/macros.hpp"
#if INCLUDE_JFR
#include "jfr/support/jfrKlassExtension.hpp"
#endif
class RecordComponent;
// An InstanceKlass is the VM level representation of a Java class.
// It contains all information needed for at class at execution runtime.
// InstanceKlass embedded field layout (after declared fields):
// [EMBEDDED Java vtable ] size in words = vtable_len
// [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.
// [EMBEDDED implementor of the interface] only exist for interface
// [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
// [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
// forward declaration for class -- see below for definition
#if INCLUDE_JVMTI
class BreakpointInfo;
#endif
class ClassFileParser;
class ClassFileStream;
class KlassDepChange;
class DependencyContext;
class fieldDescriptor;
class jniIdMapBase;
class JNIid;
class JvmtiCachedClassFieldMap;
class nmethodBucket;
class OopMapCache;
class InterpreterOopMap;
class PackageEntry;
class ModuleEntry;
// 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
// Describes where oops are located in instances of this klass.
class OopMapBlock {
public:
// Byte offset of the first oop mapped by this block.
int offset() const { return _offset; }
void set_offset(int offset) { _offset = offset; }
// Number of oops in this block.
uint count() const { return _count; }
void set_count(uint count) { _count = count; }
// sizeof(OopMapBlock) in words.
static const int size_in_words() {
return align_up((int)sizeof(OopMapBlock), wordSize) >>
LogBytesPerWord;
}
private:
int _offset;
uint _count;
};
struct JvmtiCachedClassFileData;
class InstanceKlass: public Klass {
friend class VMStructs;
friend class JVMCIVMStructs;
friend class ClassFileParser;
friend class CompileReplay;
public:
static const KlassID ID = InstanceKlassID;
protected:
InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
public:
InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
// 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 {
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
};
private:
static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
protected:
// If you add a new field that points to any metaspace object, you
// must add this field to InstanceKlass::metaspace_pointers_do().
// Annotations for this class
Annotations* _annotations;
// Package this class is defined in
PackageEntry* _package_entry;
// Array classes holding elements of this class.
Klass* volatile _array_klasses;
// Constant pool for this class.
ConstantPool* _constants;
// The InnerClasses attribute and EnclosingMethod attribute. The
// _inner_classes is an array of shorts. If the class has InnerClasses
// attribute, then the _inner_classes array begins with 4-tuples of shorts
// [inner_class_info_index, outer_class_info_index,
// inner_name_index, inner_class_access_flags] for the InnerClasses
// attribute. If the EnclosingMethod attribute exists, it occupies the
// last two shorts [class_index, method_index] of the array. If only
// the InnerClasses attribute exists, the _inner_classes array length is
// number_of_inner_classes * 4. If the class has both InnerClasses
// and EnclosingMethod attributes the _inner_classes array length is
// number_of_inner_classes * 4 + enclosing_method_attribute_size.
Array<jushort>* _inner_classes;
// The NestMembers attribute. An array of shorts, where each is a
// class info index for the class that is a nest member. This data
// has not been validated.
Array<jushort>* _nest_members;
// The NestHost attribute. The class info index for the class
// that is the nest-host of this class. This data has not been validated.
jushort _nest_host_index;
// Resolved nest-host klass: either true nest-host or self if we are not nested.
// By always being set it makes nest-member access checks simpler.
InstanceKlass* _nest_host;
// The contents of the Record attribute.
Array<RecordComponent*>* _record_components;
// the source debug extension for this klass, NULL if not specified.
// Specified as UTF-8 string without terminating zero byte in the classfile,
// it is stored in the instanceklass as a NULL-terminated UTF-8 string
const char* _source_debug_extension;
// Array name derived from this class which needs unreferencing
// if this class is unloaded.
Symbol* _array_name;
// 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
// Constant pool index to the utf8 entry of the Generic signature,
// or 0 if none.
u2 _generic_signature_index;
// Constant pool index to the utf8 entry for the name of source file
// containing this klass, 0 if not specified.
u2 _source_file_name_index;
u2 _static_oop_field_count;// number of static oop fields in this klass
u2 _java_fields_count; // The number of declared Java fields
int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
int _itable_len; // length of Java itable (in words)
// _is_marked_dependent can be set concurrently, thus cannot be part of the
// _misc_flags.
bool _is_marked_dependent; // used for marking during flushing and deoptimization
bool _is_being_redefined; // used for locking redefinition
// The low two bits of _misc_flags contains the kind field.
// This can be used to quickly discriminate among the four kinds of
// InstanceKlass.
static const unsigned _misc_kind_field_size = 2;
static const unsigned _misc_kind_field_pos = 0;
static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
// Start after _misc_kind field.
enum {
_misc_rewritten = 1 << 2, // methods rewritten.
_misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
_misc_should_verify_class = 1 << 4, // allow caching of preverification
_misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
_misc_is_contended = 1 << 6, // marked with contended annotation
_misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
_misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
_misc_has_been_redefined = 1 << 9, // class has been redefined
_misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
// code source was found to be matching the value recorded by AOT.
_misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
_misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
_misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
_misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
_misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
};
u2 loader_type_bits() {
return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
}
u2 _misc_flags;
u2 _minor_version; // minor version number of class file
u2 _major_version; // major version number of class file
Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
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* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
nmethodBucket* volatile _dep_context; // packed DependencyContext structure
uint64_t volatile _dep_context_last_cleaned;
nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
#if INCLUDE_JVMTI
BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
// Linked instanceKlasses of previous versions
InstanceKlass* _previous_versions;
// JVMTI fields can be moved to their own structure - see 6315920
// JVMTI: cached class file, before retransformable agent modified it in CFLH
JvmtiCachedClassFileData* _cached_class_file;
#endif
volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
// Class states are defined as ClassState (see above).
// Place the _init_state here to utilize the unused 2-byte after
// _idnum_allocated_count.
u1 _init_state; // state of class
u1 _reference_type; // reference type
u2 _this_class_index; // constant pool entry
#if INCLUDE_JVMTI
JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
#endif
NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
// Method array.
Array<Method*>* _methods;
// Default Method Array, concrete methods inherited from interfaces
Array<Method*>* _default_methods;
// Interfaces (InstanceKlass*s) this class declares locally to implement.
Array<InstanceKlass*>* _local_interfaces;
// Interfaces (InstanceKlass*s) this class implements transitively.
Array<InstanceKlass*>* _transitive_interfaces;
// Int array containing the original order of method in the class file (for JVMTI).
Array<int>* _method_ordering;
// Int array containing the vtable_indices for default_methods
// offset matches _default_methods offset
Array<int>* _default_vtable_indices;
// Instance and static variable information, starts with 6-tuples of shorts
// [access, name index, sig index, initval index, low_offset, high_offset]
// for all fields, followed by the generic signature data at the end of
// the array. Only fields with generic signature attributes have the generic
// signature data set in the array. The fields array looks like following:
//
// f1: [access, name index, sig index, initial value index, low_offset, high_offset]
// f2: [access, name index, sig index, initial value index, low_offset, high_offset]
// ...
// fn: [access, name index, sig index, initial value index, low_offset, high_offset]
// [generic signature index]
// [generic signature index]
// ...
Array<u2>* _fields;
// embedded Java vtable follows here
// embedded Java itables follows here
// embedded static fields follows here
// embedded nonstatic oop-map blocks follows here
// embedded implementor of this interface follows here
// The embedded implementor only exists if the current klass is an
// iterface. The possible values of the implementor fall into following
// three cases:
// NULL: no implementor.
// A Klass* that's not itself: one implementor.
// Itself: more than one implementors.
// embedded unsafe_anonymous_host klass follows here
// The embedded host klass only exists in an unsafe anonymous class for
// dynamic language support (JSR 292 enabled). The host class grants
// its access privileges to this class also. The host class is either
// named, or a previously loaded unsafe anonymous class. A non-anonymous class
// or an anonymous class loaded through normal classloading does not
// have this embedded field.
//
friend class SystemDictionary;
static bool _disable_method_binary_search;
public:
u2 loader_type() {
return _misc_flags & loader_type_bits();
}
bool is_shared_boot_class() const {
return (_misc_flags & _misc_is_shared_boot_class) != 0;
}
bool is_shared_platform_class() const {
return (_misc_flags & _misc_is_shared_platform_class) != 0;
}
bool is_shared_app_class() const {
return (_misc_flags & _misc_is_shared_app_class) != 0;
}
void clear_class_loader_type() {
_misc_flags &= ~loader_type_bits();
}
void set_class_loader_type(s2 loader_type);
bool has_nonstatic_fields() const {
return (_misc_flags & _misc_has_nonstatic_fields) != 0;
}
void set_has_nonstatic_fields(bool b) {
if (b) {
_misc_flags |= _misc_has_nonstatic_fields;
} else {
_misc_flags &= ~_misc_has_nonstatic_fields;
}
}
// 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_count() const { return (int)_static_oop_field_count; }
void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
// Java itable
int itable_length() const { return _itable_len; }
void set_itable_length(int len) { _itable_len = len; }
// array klasses
Klass* array_klasses() const { return _array_klasses; }
inline Klass* array_klasses_acquire() const; // load with acquire semantics
void set_array_klasses(Klass* k) { _array_klasses = k; }
inline void release_set_array_klasses(Klass* k); // store with release semantics
// methods
Array<Method*>* methods() const { return _methods; }
void set_methods(Array<Method*>* a) { _methods = a; }
Method* method_with_idnum(int idnum);
Method* method_with_orig_idnum(int idnum);
Method* method_with_orig_idnum(int idnum, int version);
// method ordering
Array<int>* method_ordering() const { return _method_ordering; }
void set_method_ordering(Array<int>* m) { _method_ordering = m; }
void copy_method_ordering(const intArray* m, TRAPS);
// default_methods
Array<Method*>* default_methods() const { return _default_methods; }
void set_default_methods(Array<Method*>* a) { _default_methods = a; }
// default method vtable_indices
Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
Array<int>* create_new_default_vtable_indices(int len, TRAPS);
// interfaces
Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
void set_local_interfaces(Array<InstanceKlass*>* a) {
guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
_local_interfaces = a; }
Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
void set_transitive_interfaces(Array<InstanceKlass*>* a) {
guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
_transitive_interfaces = a;
}
private:
friend class fieldDescriptor;
FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
public:
int field_offset (int index) const { return field(index)->offset(); }
int field_access_flags(int index) const { return field(index)->access_flags(); }
Symbol* field_name (int index) const { return field(index)->name(constants()); }
Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
// Number of Java declared fields
int java_fields_count() const { return (int)_java_fields_count; }
Array<u2>* fields() const { return _fields; }
void set_fields(Array<u2>* f, u2 java_fields_count) {
guarantee(_fields == NULL || f == NULL, "Just checking");
_fields = f;
_java_fields_count = java_fields_count;
}
// inner classes
Array<u2>* inner_classes() const { return _inner_classes; }
void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
// nest members
Array<u2>* nest_members() const { return _nest_members; }
void set_nest_members(Array<u2>* m) { _nest_members = m; }
// nest-host index
jushort nest_host_index() const { return _nest_host_index; }
void set_nest_host_index(u2 i) { _nest_host_index = i; }
// record components
Array<RecordComponent*>* record_components() const { return _record_components; }
void set_record_components(Array<RecordComponent*>* record_components) {
_record_components = record_components;
}
bool is_record() const { return _record_components != NULL; }
private:
// Called to verify that k is a member of this nest - does not look at k's nest-host
bool has_nest_member(InstanceKlass* k, TRAPS) const;
public:
// Returns nest-host class, resolving and validating it if needed
// Returns NULL if an exception occurs during loading, or validation fails
InstanceKlass* nest_host(Symbol* validationException, TRAPS);
// Check if this klass is a nestmate of k - resolves this nest-host and k's
bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
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
};
enum EnclosingMethodAttributeOffset {
enclosing_method_class_index_offset = 0,
enclosing_method_method_index_offset = 1,
enclosing_method_attribute_size = 2
};
// method override check
bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
// package
PackageEntry* package() const { return _package_entry; }
ModuleEntry* module() const;
bool in_unnamed_package() const { return (_package_entry == NULL); }
void set_package(PackageEntry* p) { _package_entry = p; }
void set_package(ClassLoaderData* loader_data, TRAPS);
bool is_same_class_package(const Klass* class2) const;
bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
// find an enclosing class
InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
// Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
private:
// Check prohibited package ("java/" only loadable by boot or platform loaders)
static void check_prohibited_package(Symbol* class_name,
ClassLoaderData* loader_data,
TRAPS);
public:
// 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; }
ClassState init_state() { return (ClassState)_init_state; }
bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
// defineClass specified verification
bool should_verify_class() const {
return (_misc_flags & _misc_should_verify_class) != 0;
}
void set_should_verify_class(bool value) {
if (value) {
_misc_flags |= _misc_should_verify_class;
} else {
_misc_flags &= ~_misc_should_verify_class;
}
}
// 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 rewrite_class(TRAPS);
void link_methods(TRAPS);
Method* class_initializer() const;
// set the class to initialized if no static initializer is present
void eager_initialize(Thread *thread);
// reference type
ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
void set_reference_type(ReferenceType t) {
assert(t == (u1)t, "overflow");
_reference_type = (u1)t;
}
// this class cp index
u2 this_class_index() const { return _this_class_index; }
void set_this_class_index(u2 index) { _this_class_index = index; }
static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
// find local field, returns true if found
bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
// find field in direct superinterfaces, returns the interface in which the field is defined
Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
// find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
Klass* find_field(Symbol* name, Symbol* 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
Klass* find_field(Symbol* name, Symbol* 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;
private:
inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
public:
static void disable_method_binary_search() {
_disable_method_binary_search = true;
}
// find a local method (returns NULL if not found)
Method* find_method(const Symbol* name, const Symbol* signature) const;
static Method* find_method(const Array<Method*>* methods,
const Symbol* name,
const Symbol* signature);
// find a local method, but skip static methods
Method* find_instance_method(const Symbol* name, const Symbol* signature,
PrivateLookupMode private_mode = find_private) const;
static Method* find_instance_method(const Array<Method*>* methods,
const Symbol* name,
const Symbol* signature,
PrivateLookupMode private_mode = find_private);
// find a local method (returns NULL if not found)
Method* find_local_method(const Symbol* name,
const Symbol* signature,
OverpassLookupMode overpass_mode,
StaticLookupMode static_mode,
PrivateLookupMode private_mode) const;
// find a local method from given methods array (returns NULL if not found)
static Method* find_local_method(const Array<Method*>* methods,
const Symbol* name,
const Symbol* signature,
OverpassLookupMode overpass_mode,
StaticLookupMode static_mode,
PrivateLookupMode private_mode);
// find a local method index in methods or default_methods (returns -1 if not found)
static int find_method_index(const Array<Method*>* methods,
const Symbol* name,
const Symbol* signature,
OverpassLookupMode overpass_mode,
StaticLookupMode static_mode,
PrivateLookupMode private_mode);
// lookup operation (returns NULL if not found)
Method* uncached_lookup_method(const Symbol* name,
const Symbol* signature,
OverpassLookupMode overpass_mode,
PrivateLookupMode private_mode = find_private) const;
// lookup a method in all the interfaces that this class implements
// (returns NULL if not found)
Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
// lookup a method in local defaults then in all interfaces
// (returns NULL if not found)
Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
// Find method indices by name. If a method with the specified name is
// found the index to the first method is returned, and 'end' is filled in
// with the index of first non-name-matching method. If no method is found
// -1 is returned.
int find_method_by_name(const Symbol* name, int* end) const;
static int find_method_by_name(const Array<Method*>* methods,
const Symbol* name, int* end);
// constant pool
ConstantPool* constants() const { return _constants; }
void set_constants(ConstantPool* c) { _constants = c; }
// protection domain
oop protection_domain() const;
// signers
objArrayOop signers() const;
// host class
InstanceKlass* unsafe_anonymous_host() const {
InstanceKlass** hk = adr_unsafe_anonymous_host();
if (hk == NULL) {
assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
return NULL;
} else {
assert(*hk != NULL, "host klass should always be set if the address is not null");
assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
return *hk;
}
}
void set_unsafe_anonymous_host(const InstanceKlass* host) {
assert(is_unsafe_anonymous(), "not unsafe anonymous");
const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
assert(addr != NULL, "no reversed space");
if (addr != NULL) {
*addr = host;
}
}
bool is_unsafe_anonymous() const {
return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
}
void set_is_unsafe_anonymous(bool value) {
if (value) {
_misc_flags |= _misc_is_unsafe_anonymous;
} else {
_misc_flags &= ~_misc_is_unsafe_anonymous;
}
}
bool is_contended() const {
return (_misc_flags & _misc_is_contended) != 0;
}
void set_is_contended(bool value) {
if (value) {
_misc_flags |= _misc_is_contended;
} else {
_misc_flags &= ~_misc_is_contended;
}
}
// source file name
Symbol* source_file_name() const {
return (_source_file_name_index == 0) ?
(Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
}
u2 source_file_name_index() const {
return _source_file_name_index;
}
void set_source_file_name_index(u2 sourcefile_index) {
_source_file_name_index = sourcefile_index;
}
// 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
const char* source_debug_extension() const { return _source_debug_extension; }
void set_source_debug_extension(const char* array, int length);
// symbol unloading support (refcount already added)
Symbol* array_name() { return _array_name; }
void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
// nonstatic oop-map blocks
static int nonstatic_oop_map_size(unsigned int oop_map_count) {
return oop_map_count * OopMapBlock::size_in_words();
}
unsigned int nonstatic_oop_map_count() const {
return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
}
int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
void set_nonstatic_oop_map_size(int words) {
_nonstatic_oop_map_size = words;
}
#if INCLUDE_JVMTI
// Redefinition locking. Class can only be redefined by one thread at a time.
bool is_being_redefined() const { return _is_being_redefined; }
void set_is_being_redefined(bool value) { _is_being_redefined = value; }
// RedefineClasses() support for previous versions:
void add_previous_version(InstanceKlass* ik, int emcp_method_count);
void purge_previous_version_list();
InstanceKlass* previous_versions() const { return _previous_versions; }
#else
InstanceKlass* previous_versions() const { return NULL; }
#endif
InstanceKlass* get_klass_version(int version) {
for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
if (ik->constants()->version() == version) {
return ik;
}
}
return NULL;
}
bool has_been_redefined() const {
return (_misc_flags & _misc_has_been_redefined) != 0;
}
void set_has_been_redefined() {
_misc_flags |= _misc_has_been_redefined;
}
bool has_passed_fingerprint_check() const {
return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
}
void set_has_passed_fingerprint_check(bool b) {
if (b) {
_misc_flags |= _misc_has_passed_fingerprint_check;
} else {
_misc_flags &= ~_misc_has_passed_fingerprint_check;
}
}
bool supers_have_passed_fingerprint_checks();
static bool should_store_fingerprint(bool is_unsafe_anonymous);
bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
bool has_stored_fingerprint() const;
uint64_t get_stored_fingerprint() const;
void store_fingerprint(uint64_t fingerprint);
bool is_scratch_class() const {
return (_misc_flags & _misc_is_scratch_class) != 0;
}
void set_is_scratch_class() {
_misc_flags |= _misc_is_scratch_class;
}
bool has_resolved_methods() const {
return (_misc_flags & _misc_has_resolved_methods) != 0;
}
void set_has_resolved_methods() {
_misc_flags |= _misc_has_resolved_methods;
}
private:
void set_kind(unsigned kind) {
assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
unsigned flags = _misc_flags & ~fmask;
_misc_flags = (flags | (kind << _misc_kind_field_pos));
}
bool is_kind(unsigned desired) const {
unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
return kind == desired;
}
public:
// Other is anything that is not one of the more specialized kinds of InstanceKlass.
bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
#if INCLUDE_JVMTI
void init_previous_versions() {
_previous_versions = NULL;
}
private:
static bool _has_previous_versions;
public:
static void purge_previous_versions(InstanceKlass* ik) {
if (ik->has_been_redefined()) {
ik->purge_previous_version_list();
}
}
static bool has_previous_versions_and_reset();
static bool has_previous_versions() { return _has_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(JvmtiCachedClassFileData *data) {
_cached_class_file = data;
}
JvmtiCachedClassFileData * get_cached_class_file();
jint get_cached_class_file_len();
unsigned char * get_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;
}
#else // INCLUDE_JVMTI
static void purge_previous_versions(InstanceKlass* ik) { return; };
static bool has_previous_versions_and_reset() { return false; }
void set_cached_class_file(JvmtiCachedClassFileData *data) {
assert(data == NULL, "unexpected call with JVMTI disabled");
}
JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
#endif // INCLUDE_JVMTI
bool has_nonstatic_concrete_methods() const {
return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
}
void set_has_nonstatic_concrete_methods(bool b) {
if (b) {
_misc_flags |= _misc_has_nonstatic_concrete_methods;
} else {
_misc_flags &= ~_misc_has_nonstatic_concrete_methods;
}
}
bool declares_nonstatic_concrete_methods() const {
return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
}
void set_declares_nonstatic_concrete_methods(bool b) {
if (b) {
_misc_flags |= _misc_declares_nonstatic_concrete_methods;
} else {
_misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
}
}
// for adding methods, ConstMethod::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
Symbol* generic_signature() const {
return (_generic_signature_index == 0) ?
(Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
}
u2 generic_signature_index() const {
return _generic_signature_index;
}
void set_generic_signature_index(u2 sig_index) {
_generic_signature_index = sig_index;
}
u2 enclosing_method_data(int offset) const;
u2 enclosing_method_class_index() const {
return enclosing_method_data(enclosing_method_class_index_offset);
}
u2 enclosing_method_method_index() {
return enclosing_method_data(enclosing_method_method_index_offset);
}
void set_enclosing_method_indices(u2 class_index,
u2 method_index);
// jmethodID support
jmethodID get_jmethod_id(const methodHandle& method_h);
jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
jmethodID new_id, jmethodID* new_jmeths,
jmethodID* to_dealloc_id_p,
jmethodID** to_dealloc_jmeths_p);
static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
size_t *length_p, jmethodID* id_p);
void ensure_space_for_methodids(int start_offset = 0);
jmethodID jmethod_id_or_null(Method* method);
// annotations support
Annotations* annotations() const { return _annotations; }
void set_annotations(Annotations* anno) { _annotations = anno; }
AnnotationArray* class_annotations() const {
return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
}
Array<AnnotationArray*>* fields_annotations() const {
return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
}
AnnotationArray* class_type_annotations() const {
return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
}
Array<AnnotationArray*>* fields_type_annotations() const {
return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
}
// allocation
instanceOop allocate_instance(TRAPS);
// additional member function to return a handle
instanceHandle allocate_instance_handle(TRAPS);
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(const 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
inline DependencyContext dependencies();
int mark_dependent_nmethods(KlassDepChange& changes);
void add_dependent_nmethod(nmethod* nm);
void remove_dependent_nmethod(nmethod* nm);
void clean_dependency_context();
// 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);
bool remove_osr_nmethod(nmethod* n);
int mark_osr_nmethods(const Method* m);
nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
#if INCLUDE_JVMTI
// Breakpoint support (see methods on Method* for details)
BreakpointInfo* breakpoints() const { return _breakpoints; };
void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
#endif
// support for stub routines
static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
// subclass/subinterface checks
bool implements_interface(Klass* k) const;
bool is_same_or_direct_interface(Klass* k) const;
#ifdef ASSERT
// check whether this class or one of its superclasses was redefined
bool has_redefined_this_or_super() const;
#endif
// Access to the implementor of an interface.
Klass* implementor() const;
void set_implementor(Klass* k);
int nof_implementors() const;
void add_implementor(Klass* 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
GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
Array<InstanceKlass*>* transitive_interfaces);
bool can_be_primary_super_slow() const;
int oop_size(oop obj) const { return size_helper(); }
// slow because it's a virtual call and used for verifying the layout_helper.
// Using the layout_helper bits, we can call is_instance_klass without a virtual call.
DEBUG_ONLY(bool is_instance_klass_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*, Handle, TRAPS), Handle, TRAPS);
void methods_do(void f(Method* method));
void array_klasses_do(void f(Klass* k));
void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
static InstanceKlass* cast(Klass* k) {
return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
}
static const InstanceKlass* cast(const Klass* k) {
assert(k != NULL, "k should not be null");
assert(k->is_instance_klass(), "cast to InstanceKlass");
return static_cast<const InstanceKlass*>(k);
}
virtual InstanceKlass* java_super() const {
return (super() == NULL) ? NULL : cast(super());
}
// Sizing (in words)
static int header_size() { return sizeof(InstanceKlass)/wordSize; }
static int size(int vtable_length, int itable_length,
int nonstatic_oop_map_size,
bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
return align_metadata_size(header_size() +
vtable_length +
itable_length +
nonstatic_oop_map_size +
(is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
(is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
(has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
}
int size() const { return size(vtable_length(),
itable_length(),
nonstatic_oop_map_size(),
is_interface(),
is_unsafe_anonymous(),
has_stored_fingerprint());
}
#if INCLUDE_SERVICES
virtual void collect_statistics(KlassSizeStats *sz) const;
#endif
intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
oop static_field_base_raw() { return java_mirror(); }
OopMapBlock* start_of_nonstatic_oop_maps() const {
return (OopMapBlock*)(start_of_itable() + itable_length());
}
Klass** end_of_nonstatic_oop_maps() const {
return (Klass**)(start_of_nonstatic_oop_maps() +
nonstatic_oop_map_count());
}
Klass* volatile* adr_implementor() const {
if (is_interface()) {
return (Klass* volatile*)end_of_nonstatic_oop_maps();
} else {
return NULL;
}
};
InstanceKlass** adr_unsafe_anonymous_host() const {
if (is_unsafe_anonymous()) {
InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
if (adr_impl != NULL) {
return adr_impl + 1;
} else {
return (InstanceKlass **)end_of_nonstatic_oop_maps();
}
} else {
return NULL;
}
}
address adr_fingerprint() const {
if (has_stored_fingerprint()) {
InstanceKlass** adr_host = adr_unsafe_anonymous_host();
if (adr_host != NULL) {
return (address)(adr_host + 1);
}
Klass* volatile* adr_impl = adr_implementor();
if (adr_impl != NULL) {
return (address)(adr_impl + 1);
}
return (address)end_of_nonstatic_oop_maps();
} else {
return NULL;
}
}
// 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 itable
klassItable itable() const; // return klassItable wrapper
Method* method_at_itable(Klass* holder, int index, TRAPS);
#if INCLUDE_JVMTI
void adjust_default_methods(bool* trace_name_printed);
#endif // INCLUDE_JVMTI
void clean_weak_instanceklass_links();
private:
void clean_implementors_list();
void clean_method_data();
public:
// Explicit metaspace deallocation of fields
// For RedefineClasses and class file parsing errors, we need to deallocate
// instanceKlasses and the metadata they point to.
void deallocate_contents(ClassLoaderData* loader_data);
static void deallocate_methods(ClassLoaderData* loader_data,
Array<Method*>* methods);
void static deallocate_interfaces(ClassLoaderData* loader_data,
const Klass* super_klass,
Array<InstanceKlass*>* local_interfaces,
Array<InstanceKlass*>* transitive_interfaces);
void static deallocate_record_components(ClassLoaderData* loader_data,
Array<RecordComponent*>* record_component);
// The constant pool is on stack if any of the methods are executing or
// referenced by handles.
bool on_stack() const { return _constants->on_stack(); }
// callbacks for actions during class unloading
static void unload_class(InstanceKlass* ik);
static void release_C_heap_structures(InstanceKlass* ik);
// Naming
const char* signature_name() const;
static Symbol* package_from_name(const Symbol* name, TRAPS);
// Oop fields (and metadata) iterators
//
// The InstanceKlass iterators also visits the Object's klass.
// Forward iteration
public:
// Iterate over all oop fields in the oop maps.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
// Iterate over all oop fields and metadata.
template <typename T, class OopClosureType>
inline void oop_oop_iterate(oop obj, OopClosureType* closure);
// Iterate over all oop fields in one oop map.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
// Reverse iteration
// Iterate over all oop fields and metadata.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
private:
// Iterate over all oop fields in the oop maps.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
// Iterate over all oop fields in one oop map.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
// Bounded range iteration
public:
// Iterate over all oop fields in the oop maps.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
// Iterate over all oop fields and metadata.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
private:
// Iterate over all oop fields in one oop map.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
public:
u2 idnum_allocated_count() const { return _idnum_allocated_count; }
public:
void set_in_error_state() {
assert(DumpSharedSpaces, "only call this when dumping archive");
_init_state = initialization_error;
}
bool check_sharing_error_state();
private:
// initialization state
void set_init_state(ClassState state);
void set_rewritten() { _misc_flags |= _misc_rewritten; }
void set_init_thread(Thread *thread) { _init_thread = thread; }
// The RedefineClasses() API can cause new method idnums to be needed
// which will cause the caches to grow. Safety requires different
// cache management logic if the caches can grow instead of just
// going from NULL to non-NULL.
bool idnum_can_increment() const { return has_been_redefined(); }
inline jmethodID* methods_jmethod_ids_acquire() const;
inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
// Lock during initialization
public:
// Lock for (1) initialization; (2) access to the ConstantPool of this class.
// Must be one per class and it has to be a VM internal object so java code
// cannot lock it (like the mirror).
// It has to be an object not a Mutex because it's held through java calls.
oop init_lock() const;
private:
void fence_and_clear_init_lock();
bool link_class_impl (TRAPS);
bool verify_code (TRAPS);
void initialize_impl (TRAPS);
void initialize_super_interfaces (TRAPS);
void eager_initialize_impl ();
/* jni_id_for_impl for jfieldID only */
JNIid* jni_id_for_impl (int offset);
// Returns the array class for the n'th dimension
Klass* array_klass_impl(bool or_null, int n, TRAPS);
// Returns the array class with this class as element type
Klass* array_klass_impl(bool or_null, TRAPS);
// find a local method (returns NULL if not found)
Method* find_method_impl(const Symbol* name,
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