/* * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_CLASSFILE_JAVACLASSES_HPP #define SHARE_VM_CLASSFILE_JAVACLASSES_HPP #include "classfile/systemDictionary.hpp" #include "jvmtifiles/jvmti.h" #include "oops/oop.hpp" #include "runtime/os.hpp" #include "utilities/utf8.hpp" // Interface for manipulating the basic Java classes. // // All dependencies on layout of actual Java classes should be kept here. // If the layout of any of the classes above changes the offsets must be adjusted. // // For most classes we hardwire the offsets for performance reasons. In certain // cases (e.g. java.security.AccessControlContext) we compute the offsets at // startup since the layout here differs between JDK1.2 and JDK1.3. // // Note that fields (static and non-static) are arranged with oops before non-oops // on a per class basis. The offsets below have to reflect this ordering. // // When editing the layouts please update the check_offset verification code // correspondingly. The names in the enums must be identical to the actual field // names in order for the verification code to work. // Interface to java.lang.String objects class java_lang_String : AllStatic { private: enum { hc_value_offset = 0, hc_offset_offset = 1 //hc_count_offset = 2 -- not a word-scaled offset //hc_hash_offset = 3 -- not a word-scaled offset }; static int value_offset; static int offset_offset; static int count_offset; static int hash_offset; static Handle basic_create(int length, bool tenured, TRAPS); static Handle basic_create_from_unicode(jchar* unicode, int length, bool tenured, TRAPS); static void set_value( oop string, typeArrayOop buffer) { string->obj_field_put(value_offset, (oop)buffer); } static void set_offset(oop string, int offset) { string->int_field_put(offset_offset, offset); } static void set_count( oop string, int count) { string->int_field_put(count_offset, count); } public: // Instance creation static Handle create_from_unicode(jchar* unicode, int len, TRAPS); static Handle create_tenured_from_unicode(jchar* unicode, int len, TRAPS); static oop create_oop_from_unicode(jchar* unicode, int len, TRAPS); static Handle create_from_str(const char* utf8_str, TRAPS); static oop create_oop_from_str(const char* utf8_str, TRAPS); static Handle create_from_symbol(Symbol* symbol, TRAPS); static Handle create_from_platform_dependent_str(const char* str, TRAPS); static Handle char_converter(Handle java_string, jchar from_char, jchar to_char, TRAPS); static int value_offset_in_bytes() { return value_offset; } static int count_offset_in_bytes() { return count_offset; } static int offset_offset_in_bytes() { return offset_offset; } static int hash_offset_in_bytes() { return hash_offset; } // Accessors static typeArrayOop value(oop java_string) { assert(is_instance(java_string), "must be java_string"); return (typeArrayOop) java_string->obj_field(value_offset); } static int offset(oop java_string) { assert(is_instance(java_string), "must be java_string"); return java_string->int_field(offset_offset); } static int length(oop java_string) { assert(is_instance(java_string), "must be java_string"); return java_string->int_field(count_offset); } static int utf8_length(oop java_string); // String converters static char* as_utf8_string(oop java_string); static char* as_utf8_string(oop java_string, char* buf, int buflen); static char* as_utf8_string(oop java_string, int start, int len); static char* as_platform_dependent_str(Handle java_string, TRAPS); static jchar* as_unicode_string(oop java_string, int& length); // Compute the hash value for a java.lang.String object which would // contain the characters passed in. This hash value is used for at // least two purposes. // // (a) As the hash value used by the StringTable for bucket selection // and comparison (stored in the HashtableEntry structures). This // is used in the String.intern() method. // // (b) As the hash value used by the String object itself, in // String.hashCode(). This value is normally calculate in Java code // in the String.hashCode method(), but is precomputed for String // objects in the shared archive file. // // For this reason, THIS ALGORITHM MUST MATCH String.hashCode(). static unsigned int hash_string(jchar* s, int len) { unsigned int h = 0; while (len-- > 0) { h = 31*h + (unsigned int) *s; s++; } return h; } static unsigned int hash_string(oop java_string); static bool equals(oop java_string, jchar* chars, int len); // Conversion between '.' and '/' formats static Handle externalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '/', '.', THREAD); } static Handle internalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '.', '/', THREAD); } // Conversion static Symbol* as_symbol(Handle java_string, TRAPS); static Symbol* as_symbol_or_null(oop java_string); // Testers static bool is_instance(oop obj) { return obj != NULL && obj->klass() == SystemDictionary::String_klass(); } // Debugging static void print(Handle java_string, outputStream* st); friend class JavaClasses; }; // Interface to java.lang.Class objects #define CLASS_INJECTED_FIELDS(macro) \ macro(java_lang_Class, klass, object_signature, false) \ macro(java_lang_Class, resolved_constructor, object_signature, false) \ macro(java_lang_Class, array_klass, object_signature, false) \ macro(java_lang_Class, oop_size, int_signature, false) \ macro(java_lang_Class, static_oop_field_count, int_signature, false) class java_lang_Class : AllStatic { friend class VMStructs; private: // The fake offsets are added by the class loader when java.lang.Class is loaded static int _klass_offset; static int _resolved_constructor_offset; static int _array_klass_offset; static int _oop_size_offset; static int _static_oop_field_count_offset; static bool offsets_computed; static int classRedefinedCount_offset; public: static void compute_offsets(); // Instance creation static oop create_mirror(KlassHandle k, TRAPS); static void fixup_mirror(KlassHandle k, TRAPS); static oop create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS); // Conversion static klassOop as_klassOop(oop java_class); static void set_klass(oop java_class, klassOop klass); static BasicType as_BasicType(oop java_class, klassOop* reference_klass = NULL); static BasicType as_BasicType(oop java_class, KlassHandle* reference_klass) { klassOop refk_oop = NULL; BasicType result = as_BasicType(java_class, &refk_oop); (*reference_klass) = KlassHandle(refk_oop); return result; } static Symbol* as_signature(oop java_class, bool intern_if_not_found, TRAPS); static void print_signature(oop java_class, outputStream *st); // Testing static bool is_instance(oop obj) { return obj != NULL && obj->klass() == SystemDictionary::Class_klass(); } static bool is_primitive(oop java_class); static BasicType primitive_type(oop java_class); static oop primitive_mirror(BasicType t); // JVM_NewInstance support static methodOop resolved_constructor(oop java_class); static void set_resolved_constructor(oop java_class, methodOop constructor); // JVM_NewArray support static klassOop array_klass(oop java_class); static void set_array_klass(oop java_class, klassOop klass); // compiler support for class operations static int klass_offset_in_bytes() { return _klass_offset; } static int resolved_constructor_offset_in_bytes() { return _resolved_constructor_offset; } static int array_klass_offset_in_bytes() { return _array_klass_offset; } // Support for classRedefinedCount field static int classRedefinedCount(oop the_class_mirror); static void set_classRedefinedCount(oop the_class_mirror, int value); static int oop_size(oop java_class); static void set_oop_size(oop java_class, int size); static int static_oop_field_count(oop java_class); static void set_static_oop_field_count(oop java_class, int size); // Debugging friend class JavaClasses; friend class instanceKlass; // verification code accesses offsets friend class ClassFileParser; // access to number_of_fake_fields }; // Interface to java.lang.Thread objects class java_lang_Thread : AllStatic { private: // Note that for this class the layout changed between JDK1.2 and JDK1.3, // so we compute the offsets at startup rather than hard-wiring them. static int _name_offset; static int _group_offset; static int _contextClassLoader_offset; static int _inheritedAccessControlContext_offset; static int _priority_offset; static int _eetop_offset; static int _daemon_offset; static int _stillborn_offset; static int _stackSize_offset; static int _tid_offset; static int _thread_status_offset; static int _park_blocker_offset; static int _park_event_offset ; static void compute_offsets(); public: // Instance creation static oop create(); // Returns the JavaThread associated with the thread obj static JavaThread* thread(oop java_thread); // Set JavaThread for instance static void set_thread(oop java_thread, JavaThread* thread); // Name static typeArrayOop name(oop java_thread); static void set_name(oop java_thread, typeArrayOop name); // Priority static ThreadPriority priority(oop java_thread); static void set_priority(oop java_thread, ThreadPriority priority); // Thread group static oop threadGroup(oop java_thread); // Stillborn static bool is_stillborn(oop java_thread); static void set_stillborn(oop java_thread); // Alive (NOTE: this is not really a field, but provides the correct // definition without doing a Java call) static bool is_alive(oop java_thread); // Daemon static bool is_daemon(oop java_thread); static void set_daemon(oop java_thread); // Context ClassLoader static oop context_class_loader(oop java_thread); // Control context static oop inherited_access_control_context(oop java_thread); // Stack size hint static jlong stackSize(oop java_thread); // Thread ID static jlong thread_id(oop java_thread); // Blocker object responsible for thread parking static oop park_blocker(oop java_thread); // Pointer to type-stable park handler, encoded as jlong. // Should be set when apparently null // For details, see unsafe.cpp Unsafe_Unpark static jlong park_event(oop java_thread); static bool set_park_event(oop java_thread, jlong ptr); // Java Thread Status for JVMTI and M&M use. // This thread status info is saved in threadStatus field of // java.lang.Thread java class. enum ThreadStatus { NEW = 0, RUNNABLE = JVMTI_THREAD_STATE_ALIVE + // runnable / running JVMTI_THREAD_STATE_RUNNABLE, SLEEPING = JVMTI_THREAD_STATE_ALIVE + // Thread.sleep() JVMTI_THREAD_STATE_WAITING + JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + JVMTI_THREAD_STATE_SLEEPING, IN_OBJECT_WAIT = JVMTI_THREAD_STATE_ALIVE + // Object.wait() JVMTI_THREAD_STATE_WAITING + JVMTI_THREAD_STATE_WAITING_INDEFINITELY + JVMTI_THREAD_STATE_IN_OBJECT_WAIT, IN_OBJECT_WAIT_TIMED = JVMTI_THREAD_STATE_ALIVE + // Object.wait(long) JVMTI_THREAD_STATE_WAITING + JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + JVMTI_THREAD_STATE_IN_OBJECT_WAIT, PARKED = JVMTI_THREAD_STATE_ALIVE + // LockSupport.park() JVMTI_THREAD_STATE_WAITING + JVMTI_THREAD_STATE_WAITING_INDEFINITELY + JVMTI_THREAD_STATE_PARKED, PARKED_TIMED = JVMTI_THREAD_STATE_ALIVE + // LockSupport.park(long) JVMTI_THREAD_STATE_WAITING + JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + JVMTI_THREAD_STATE_PARKED, BLOCKED_ON_MONITOR_ENTER = JVMTI_THREAD_STATE_ALIVE + // (re-)entering a synchronization block JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER, TERMINATED = JVMTI_THREAD_STATE_TERMINATED }; // Write thread status info to threadStatus field of java.lang.Thread. static void set_thread_status(oop java_thread_oop, ThreadStatus status); // Read thread status info from threadStatus field of java.lang.Thread. static ThreadStatus get_thread_status(oop java_thread_oop); static const char* thread_status_name(oop java_thread_oop); // Debugging friend class JavaClasses; }; // Interface to java.lang.ThreadGroup objects class java_lang_ThreadGroup : AllStatic { private: static int _parent_offset; static int _name_offset; static int _threads_offset; static int _groups_offset; static int _maxPriority_offset; static int _destroyed_offset; static int _daemon_offset; static int _vmAllowSuspension_offset; static int _nthreads_offset; static int _ngroups_offset; static void compute_offsets(); public: // parent ThreadGroup static oop parent(oop java_thread_group); // name static typeArrayOop name(oop java_thread_group); // ("name as oop" accessor is not necessary) // Number of threads in group static int nthreads(oop java_thread_group); // threads static objArrayOop threads(oop java_thread_group); // Number of threads in group static int ngroups(oop java_thread_group); // groups static objArrayOop groups(oop java_thread_group); // maxPriority in group static ThreadPriority maxPriority(oop java_thread_group); // Destroyed static bool is_destroyed(oop java_thread_group); // Daemon static bool is_daemon(oop java_thread_group); // vmAllowSuspension static bool is_vmAllowSuspension(oop java_thread_group); // Debugging friend class JavaClasses; }; // Interface to java.lang.Throwable objects class java_lang_Throwable: AllStatic { friend class BacktraceBuilder; private: // Offsets enum { hc_backtrace_offset = 0, hc_detailMessage_offset = 1, hc_cause_offset = 2, // New since 1.4 hc_stackTrace_offset = 3 // New since 1.4 }; enum { hc_static_unassigned_stacktrace_offset = 0 // New since 1.7 }; // Trace constants enum { trace_methods_offset = 0, trace_bcis_offset = 1, trace_next_offset = 2, trace_size = 3, trace_chunk_size = 32 }; static int backtrace_offset; static int detailMessage_offset; static int cause_offset; static int stackTrace_offset; static int static_unassigned_stacktrace_offset; // Printing static char* print_stack_element_to_buffer(methodOop method, int bci); static void print_to_stream(Handle stream, const char* str); // StackTrace (programmatic access, new since 1.4) static void clear_stacktrace(oop throwable); // No stack trace available static const char* no_stack_trace_message(); // Stacktrace (post JDK 1.7.0 to allow immutability protocol to be followed) static void set_stacktrace(oop throwable, oop st_element_array); static oop unassigned_stacktrace(); public: // Backtrace static oop backtrace(oop throwable); static void set_backtrace(oop throwable, oop value); // Needed by JVMTI to filter out this internal field. static int get_backtrace_offset() { return backtrace_offset;} static int get_detailMessage_offset() { return detailMessage_offset;} // Message static oop message(oop throwable); static oop message(Handle throwable); static void set_message(oop throwable, oop value); // Print stack trace stored in exception by call-back to Java // Note: this is no longer used in Merlin, but we still suppport // it for compatibility. static void print_stack_trace(oop throwable, oop print_stream); static void print_stack_element(Handle stream, methodOop method, int bci); static void print_stack_element(outputStream *st, methodOop method, int bci); static void print_stack_usage(Handle stream); // Allocate space for backtrace (created but stack trace not filled in) static void allocate_backtrace(Handle throwable, TRAPS); // Fill in current stack trace for throwable with preallocated backtrace (no GC) static void fill_in_stack_trace_of_preallocated_backtrace(Handle throwable); // Fill in current stack trace, can cause GC static void fill_in_stack_trace(Handle throwable, methodHandle method, TRAPS); static void fill_in_stack_trace(Handle throwable, methodHandle method = methodHandle()); // Programmatic access to stack trace static oop get_stack_trace_element(oop throwable, int index, TRAPS); static int get_stack_trace_depth(oop throwable, TRAPS); // Printing static void print(oop throwable, outputStream* st); static void print(Handle throwable, outputStream* st); static void print_stack_trace(oop throwable, outputStream* st); // Debugging friend class JavaClasses; }; // Interface to java.lang.reflect.AccessibleObject objects class java_lang_reflect_AccessibleObject: AllStatic { private: // Note that to reduce dependencies on the JDK we compute these // offsets at run-time. static int override_offset; static void compute_offsets(); public: // Accessors static jboolean override(oop reflect); static void set_override(oop reflect, jboolean value); // Debugging friend class JavaClasses; }; // Interface to java.lang.reflect.Method objects class java_lang_reflect_Method : public java_lang_reflect_AccessibleObject { private: // Note that to reduce dependencies on the JDK we compute these // offsets at run-time. static int clazz_offset; static int name_offset; static int returnType_offset; static int parameterTypes_offset; static int exceptionTypes_offset; static int slot_offset; static int modifiers_offset; static int signature_offset; static int annotations_offset; static int parameter_annotations_offset; static int annotation_default_offset; static void compute_offsets(); public: // Allocation static Handle create(TRAPS); // Accessors static oop clazz(oop reflect); static void set_clazz(oop reflect, oop value); static oop name(oop method); static void set_name(oop method, oop value); static oop return_type(oop method); static void set_return_type(oop method, oop value); static oop parameter_types(oop method); static void set_parameter_types(oop method, oop value); static oop exception_types(oop method); static void set_exception_types(oop method, oop value); static int slot(oop reflect); static void set_slot(oop reflect, int value); static int modifiers(oop method); static void set_modifiers(oop method, int value); static bool has_signature_field(); static oop signature(oop method); static void set_signature(oop method, oop value); static bool has_annotations_field(); static oop annotations(oop method); static void set_annotations(oop method, oop value); static bool has_parameter_annotations_field(); static oop parameter_annotations(oop method); static void set_parameter_annotations(oop method, oop value); static bool has_annotation_default_field(); static oop annotation_default(oop method); static void set_annotation_default(oop method, oop value); // Debugging friend class JavaClasses; }; // Interface to java.lang.reflect.Constructor objects class java_lang_reflect_Constructor : public java_lang_reflect_AccessibleObject { private: // Note that to reduce dependencies on the JDK we compute these // offsets at run-time. static int clazz_offset; static int parameterTypes_offset; static int exceptionTypes_offset; static int slot_offset; static int modifiers_offset; static int signature_offset; static int annotations_offset; static int parameter_annotations_offset; static void compute_offsets(); public: // Allocation static Handle create(TRAPS); // Accessors static oop clazz(oop reflect); static void set_clazz(oop reflect, oop value); static oop parameter_types(oop constructor); static void set_parameter_types(oop constructor, oop value); static oop exception_types(oop constructor); static void set_exception_types(oop constructor, oop value); static int slot(oop reflect); static void set_slot(oop reflect, int value); static int modifiers(oop constructor); static void set_modifiers(oop constructor, int value); static bool has_signature_field(); static oop signature(oop constructor); static void set_signature(oop constructor, oop value); static bool has_annotations_field(); static oop annotations(oop constructor); static void set_annotations(oop constructor, oop value); static bool has_parameter_annotations_field(); static oop parameter_annotations(oop method); static void set_parameter_annotations(oop method, oop value); // Debugging friend class JavaClasses; }; // Interface to java.lang.reflect.Field objects class java_lang_reflect_Field : public java_lang_reflect_AccessibleObject { private: // Note that to reduce dependencies on the JDK we compute these // offsets at run-time. static int clazz_offset; static int name_offset; static int type_offset; static int slot_offset; static int modifiers_offset; static int signature_offset; static int annotations_offset; static void compute_offsets(); public: // Allocation static Handle create(TRAPS); // Accessors static oop clazz(oop reflect); static void set_clazz(oop reflect, oop value); static oop name(oop field); static void set_name(oop field, oop value); static oop type(oop field); static void set_type(oop field, oop value); static int slot(oop reflect); static void set_slot(oop reflect, int value); static int modifiers(oop field); static void set_modifiers(oop field, int value); static bool has_signature_field(); static oop signature(oop constructor); static void set_signature(oop constructor, oop value); static bool has_annotations_field(); static oop annotations(oop constructor); static void set_annotations(oop constructor, oop value); static bool has_parameter_annotations_field(); static oop parameter_annotations(oop method); static void set_parameter_annotations(oop method, oop value); static bool has_annotation_default_field(); static oop annotation_default(oop method); static void set_annotation_default(oop method, oop value); // Debugging friend class JavaClasses; }; // Interface to sun.reflect.ConstantPool objects class sun_reflect_ConstantPool { private: // Note that to reduce dependencies on the JDK we compute these // offsets at run-time. static int _cp_oop_offset; static void compute_offsets(); public: // Allocation static Handle create(TRAPS); // Accessors static oop cp_oop(oop reflect); static void set_cp_oop(oop reflect, oop value); static int cp_oop_offset() { return _cp_oop_offset; } // Debugging friend class JavaClasses; }; // Interface to sun.reflect.UnsafeStaticFieldAccessorImpl objects class sun_reflect_UnsafeStaticFieldAccessorImpl { private: static int _base_offset; static void compute_offsets(); public: static int base_offset() { return _base_offset; } // Debugging friend class JavaClasses; }; // Interface to java.lang primitive type boxing objects: // - java.lang.Boolean // - java.lang.Character // - java.lang.Float // - java.lang.Double // - java.lang.Byte // - java.lang.Short // - java.lang.Integer // - java.lang.Long // This could be separated out into 8 individual classes. class java_lang_boxing_object: AllStatic { private: enum { hc_value_offset = 0 }; static int value_offset; static int long_value_offset; static oop initialize_and_allocate(BasicType type, TRAPS); public: // Allocation. Returns a boxed value, or NULL for invalid type. static oop create(BasicType type, jvalue* value, TRAPS); // Accessors. Returns the basic type being boxed, or T_ILLEGAL for invalid oop. static BasicType get_value(oop box, jvalue* value); static BasicType set_value(oop box, jvalue* value); static BasicType basic_type(oop box); static bool is_instance(oop box) { return basic_type(box) != T_ILLEGAL; } static bool is_instance(oop box, BasicType type) { return basic_type(box) == type; } static void print(oop box, outputStream* st) { jvalue value; print(get_value(box, &value), &value, st); } static void print(BasicType type, jvalue* value, outputStream* st); static int value_offset_in_bytes(BasicType type) { return ( type == T_LONG || type == T_DOUBLE ) ? long_value_offset : value_offset; } // Debugging friend class JavaClasses; }; // Interface to java.lang.ref.Reference objects class java_lang_ref_Reference: AllStatic { public: enum { hc_referent_offset = 0, hc_queue_offset = 1, hc_next_offset = 2, hc_discovered_offset = 3 // Is not last, see SoftRefs. }; enum { hc_static_lock_offset = 0, hc_static_pending_offset = 1 }; static int referent_offset; static int queue_offset; static int next_offset; static int discovered_offset; static int static_lock_offset; static int static_pending_offset; static int number_of_fake_oop_fields; // Accessors static oop referent(oop ref) { return ref->obj_field(referent_offset); } static void set_referent(oop ref, oop value) { ref->obj_field_put(referent_offset, value); } static void set_referent_raw(oop ref, oop value) { ref->obj_field_put_raw(referent_offset, value); } static HeapWord* referent_addr(oop ref) { return ref->obj_field_addr(referent_offset); } static oop next(oop ref) { return ref->obj_field(next_offset); } static void set_next(oop ref, oop value) { ref->obj_field_put(next_offset, value); } static void set_next_raw(oop ref, oop value) { ref->obj_field_put_raw(next_offset, value); } static HeapWord* next_addr(oop ref) { return ref->obj_field_addr(next_offset); } static oop discovered(oop ref) { return ref->obj_field(discovered_offset); } static void set_discovered(oop ref, oop value) { ref->obj_field_put(discovered_offset, value); } static void set_discovered_raw(oop ref, oop value) { ref->obj_field_put_raw(discovered_offset, value); } static HeapWord* discovered_addr(oop ref) { return ref->obj_field_addr(discovered_offset); } // Accessors for statics static oop pending_list_lock(); static oop pending_list(); static HeapWord* pending_list_addr(); }; // Interface to java.lang.ref.SoftReference objects class java_lang_ref_SoftReference: public java_lang_ref_Reference { public: enum { // The timestamp is a long field and may need to be adjusted for alignment. hc_timestamp_offset = hc_discovered_offset + 1 }; enum { hc_static_clock_offset = 0 }; static int timestamp_offset; static int static_clock_offset; // Accessors static jlong timestamp(oop ref); // Accessors for statics static jlong clock(); static void set_clock(jlong value); }; // Interface to java.lang.invoke.MethodHandle objects #define METHODHANDLE_INJECTED_FIELDS(macro) \ macro(java_lang_invoke_MethodHandle, vmentry, intptr_signature, false) \ macro(java_lang_invoke_MethodHandle, vmtarget, object_signature, true) class MethodHandleEntry; class java_lang_invoke_MethodHandle: AllStatic { friend class JavaClasses; private: static int _vmentry_offset; // assembly code trampoline for MH static int _vmtarget_offset; // class-specific target reference static int _type_offset; // the MethodType of this MH static void compute_offsets(); public: // Accessors static oop type(oop mh); static void set_type(oop mh, oop mtype); static oop vmtarget(oop mh); static void set_vmtarget(oop mh, oop target); static MethodHandleEntry* vmentry(oop mh); static void set_vmentry(oop mh, MethodHandleEntry* data); static int vmslots(oop mh); // Testers static bool is_subclass(klassOop klass) { return Klass::cast(klass)->is_subclass_of(SystemDictionary::MethodHandle_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } // Accessors for code generation: static int type_offset_in_bytes() { return _type_offset; } static int vmtarget_offset_in_bytes() { return _vmtarget_offset; } static int vmentry_offset_in_bytes() { return _vmentry_offset; } }; #define DIRECTMETHODHANDLE_INJECTED_FIELDS(macro) \ macro(java_lang_invoke_DirectMethodHandle, vmindex, int_signature, true) class java_lang_invoke_DirectMethodHandle: public java_lang_invoke_MethodHandle { friend class JavaClasses; private: static int _vmindex_offset; // negative or vtable idx or itable idx static void compute_offsets(); public: // Accessors static int vmindex(oop mh); static void set_vmindex(oop mh, int index); // Testers static bool is_subclass(klassOop klass) { return Klass::cast(klass)->is_subclass_of(SystemDictionary::DirectMethodHandle_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } // Accessors for code generation: static int vmindex_offset_in_bytes() { return _vmindex_offset; } }; class java_lang_invoke_BoundMethodHandle: public java_lang_invoke_MethodHandle { friend class JavaClasses; private: static int _argument_offset; // argument value bound into this MH static int _vmargslot_offset; // relevant argument slot (<= vmslots) static void compute_offsets(); public: static oop argument(oop mh); static void set_argument(oop mh, oop ref); static jint vmargslot(oop mh); static void set_vmargslot(oop mh, jint slot); // Testers static bool is_subclass(klassOop klass) { return Klass::cast(klass)->is_subclass_of(SystemDictionary::BoundMethodHandle_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } static int argument_offset_in_bytes() { return _argument_offset; } static int vmargslot_offset_in_bytes() { return _vmargslot_offset; } }; class java_lang_invoke_AdapterMethodHandle: public java_lang_invoke_BoundMethodHandle { friend class JavaClasses; private: static int _conversion_offset; // type of conversion to apply static void compute_offsets(); public: static int conversion(oop mh); static void set_conversion(oop mh, int conv); // Testers static bool is_subclass(klassOop klass) { return Klass::cast(klass)->is_subclass_of(SystemDictionary::AdapterMethodHandle_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants): enum { OP_RETYPE_ONLY = 0x0, // no argument changes; straight retype OP_RETYPE_RAW = 0x1, // straight retype, trusted (void->int, Object->T) OP_CHECK_CAST = 0x2, // ref-to-ref conversion; requires a Class argument OP_PRIM_TO_PRIM = 0x3, // converts from one primitive to another OP_REF_TO_PRIM = 0x4, // unboxes a wrapper to produce a primitive OP_PRIM_TO_REF = 0x5, // boxes a primitive into a wrapper OP_SWAP_ARGS = 0x6, // swap arguments (vminfo is 2nd arg) OP_ROT_ARGS = 0x7, // rotate arguments (vminfo is displaced arg) OP_DUP_ARGS = 0x8, // duplicates one or more arguments (at TOS) OP_DROP_ARGS = 0x9, // remove one or more argument slots OP_COLLECT_ARGS = 0xA, // combine arguments using an auxiliary function OP_SPREAD_ARGS = 0xB, // expand in place a varargs array (of known size) OP_FOLD_ARGS = 0xC, // combine but do not remove arguments; prepend result //OP_UNUSED_13 = 0xD, // unused code, perhaps for reified argument lists CONV_OP_LIMIT = 0xE, // limit of CONV_OP enumeration CONV_OP_MASK = 0xF00, // this nybble contains the conversion op field CONV_TYPE_MASK = 0x0F, // fits T_ADDRESS and below CONV_VMINFO_MASK = 0x0FF, // LSB is reserved for JVM use CONV_VMINFO_SHIFT = 0, // position of bits in CONV_VMINFO_MASK CONV_OP_SHIFT = 8, // position of bits in CONV_OP_MASK CONV_DEST_TYPE_SHIFT = 12, // byte 2 has the adapter BasicType (if needed) CONV_SRC_TYPE_SHIFT = 16, // byte 2 has the source BasicType (if needed) CONV_STACK_MOVE_SHIFT = 20, // high 12 bits give signed SP change CONV_STACK_MOVE_MASK = (1 << (32 - CONV_STACK_MOVE_SHIFT)) - 1 }; static int conversion_offset_in_bytes() { return _conversion_offset; } }; // A simple class that maintains an invocation count class java_lang_invoke_CountingMethodHandle: public java_lang_invoke_MethodHandle { friend class JavaClasses; private: static int _vmcount_offset; static void compute_offsets(); public: // Accessors static int vmcount(oop mh); static void set_vmcount(oop mh, int count); // Testers static bool is_subclass(klassOop klass) { return SystemDictionary::CountingMethodHandle_klass() != NULL && Klass::cast(klass)->is_subclass_of(SystemDictionary::CountingMethodHandle_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } // Accessors for code generation: static int vmcount_offset_in_bytes() { return _vmcount_offset; } }; // Interface to java.lang.invoke.MemberName objects // (These are a private interface for Java code to query the class hierarchy.) #define MEMBERNAME_INJECTED_FIELDS(macro) \ macro(java_lang_invoke_MemberName, vmtarget, object_signature, true) class java_lang_invoke_MemberName: AllStatic { friend class JavaClasses; private: // From java.lang.invoke.MemberName: // private Class clazz; // class in which the method is defined // private String name; // may be null if not yet materialized // private Object type; // may be null if not yet materialized // private int flags; // modifier bits; see reflect.Modifier // private Object vmtarget; // VM-specific target value // private int vmindex; // method index within class or interface static int _clazz_offset; static int _name_offset; static int _type_offset; static int _flags_offset; static int _vmtarget_offset; static int _vmindex_offset; static void compute_offsets(); public: // Accessors static oop clazz(oop mname); static void set_clazz(oop mname, oop clazz); static oop type(oop mname); static void set_type(oop mname, oop type); static oop name(oop mname); static void set_name(oop mname, oop name); static int flags(oop mname); static void set_flags(oop mname, int flags); static int modifiers(oop mname) { return (u2) flags(mname); } static void set_modifiers(oop mname, int mods) { set_flags(mname, (flags(mname) &~ (u2)-1) | (u2)mods); } static oop vmtarget(oop mname); static void set_vmtarget(oop mname, oop target); static int vmindex(oop mname); static void set_vmindex(oop mname, int index); // Testers static bool is_subclass(klassOop klass) { return Klass::cast(klass)->is_subclass_of(SystemDictionary::MemberName_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants): enum { MN_IS_METHOD = 0x00010000, // method (not constructor) MN_IS_CONSTRUCTOR = 0x00020000, // constructor MN_IS_FIELD = 0x00040000, // field MN_IS_TYPE = 0x00080000, // nested type MN_SEARCH_SUPERCLASSES = 0x00100000, // for MHN.getMembers MN_SEARCH_INTERFACES = 0x00200000, // for MHN.getMembers VM_INDEX_UNINITIALIZED = -99 }; // Accessors for code generation: static int clazz_offset_in_bytes() { return _clazz_offset; } static int type_offset_in_bytes() { return _type_offset; } static int name_offset_in_bytes() { return _name_offset; } static int flags_offset_in_bytes() { return _flags_offset; } static int vmtarget_offset_in_bytes() { return _vmtarget_offset; } static int vmindex_offset_in_bytes() { return _vmindex_offset; } }; // Interface to java.lang.invoke.MethodType objects class java_lang_invoke_MethodType: AllStatic { friend class JavaClasses; private: static int _rtype_offset; static int _ptypes_offset; static int _form_offset; static void compute_offsets(); public: // Accessors static oop rtype(oop mt); static objArrayOop ptypes(oop mt); static oop form(oop mt); static oop ptype(oop mt, int index); static int ptype_count(oop mt); static Symbol* as_signature(oop mt, bool intern_if_not_found, TRAPS); static void print_signature(oop mt, outputStream* st); static bool is_instance(oop obj) { return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass(); } static bool equals(oop mt1, oop mt2); // Accessors for code generation: static int rtype_offset_in_bytes() { return _rtype_offset; } static int ptypes_offset_in_bytes() { return _ptypes_offset; } static int form_offset_in_bytes() { return _form_offset; } }; #define METHODTYPEFORM_INJECTED_FIELDS(macro) \ macro(java_lang_invoke_MethodTypeForm, vmslots, int_signature, true) \ macro(java_lang_invoke_MethodTypeForm, vmlayout, object_signature, true) class java_lang_invoke_MethodTypeForm: AllStatic { friend class JavaClasses; private: static int _vmslots_offset; // number of argument slots needed static int _vmlayout_offset; // object describing internal calling sequence static int _erasedType_offset; // erasedType = canonical MethodType static int _genericInvoker_offset; // genericInvoker = adapter for invokeGeneric static void compute_offsets(); public: // Accessors static int vmslots(oop mtform); static void set_vmslots(oop mtform, int vmslots); static oop erasedType(oop mtform); static oop genericInvoker(oop mtform); static oop vmlayout(oop mtform); static oop init_vmlayout(oop mtform, oop cookie); // Accessors for code generation: static int vmslots_offset_in_bytes() { return _vmslots_offset; } static int vmlayout_offset_in_bytes() { return _vmlayout_offset; } static int erasedType_offset_in_bytes() { return _erasedType_offset; } static int genericInvoker_offset_in_bytes() { return _genericInvoker_offset; } }; // Interface to java.lang.invoke.CallSite objects class java_lang_invoke_CallSite: AllStatic { friend class JavaClasses; private: static int _target_offset; static void compute_offsets(); public: // Accessors static oop target( oop site) { return site->obj_field( _target_offset); } static void set_target( oop site, oop target) { site->obj_field_put( _target_offset, target); } static volatile oop target_volatile(oop site) { return site->obj_field_volatile( _target_offset); } static void set_target_volatile(oop site, oop target) { site->obj_field_put_volatile(_target_offset, target); } // Testers static bool is_subclass(klassOop klass) { return Klass::cast(klass)->is_subclass_of(SystemDictionary::CallSite_klass()); } static bool is_instance(oop obj) { return obj != NULL && is_subclass(obj->klass()); } // Accessors for code generation: static int target_offset_in_bytes() { return _target_offset; } }; // Interface to java.security.AccessControlContext objects class java_security_AccessControlContext: AllStatic { private: // Note that for this class the layout changed between JDK1.2 and JDK1.3, // so we compute the offsets at startup rather than hard-wiring them. static int _context_offset; static int _privilegedContext_offset; static int _isPrivileged_offset; static void compute_offsets(); public: static oop create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS); // Debugging/initialization friend class JavaClasses; }; // Interface to java.lang.ClassLoader objects class java_lang_ClassLoader : AllStatic { private: enum { hc_parent_offset = 0 }; static bool offsets_computed; static int parent_offset; static int parallelCapable_offset; static void compute_offsets(); public: static oop parent(oop loader); // Support for parallelCapable field static bool parallelCapable(oop the_class_mirror); static bool is_trusted_loader(oop loader); // Fix for 4474172 static oop non_reflection_class_loader(oop loader); // Debugging friend class JavaClasses; }; // Interface to java.lang.System objects class java_lang_System : AllStatic { private: enum { hc_static_in_offset = 0, hc_static_out_offset = 1, hc_static_err_offset = 2 }; static int static_in_offset; static int static_out_offset; static int static_err_offset; public: static int in_offset_in_bytes(); static int out_offset_in_bytes(); static int err_offset_in_bytes(); // Debugging friend class JavaClasses; }; // Interface to java.lang.StackTraceElement objects class java_lang_StackTraceElement: AllStatic { private: enum { hc_declaringClass_offset = 0, hc_methodName_offset = 1, hc_fileName_offset = 2, hc_lineNumber_offset = 3 }; static int declaringClass_offset; static int methodName_offset; static int fileName_offset; static int lineNumber_offset; public: // Setters static void set_declaringClass(oop element, oop value); static void set_methodName(oop element, oop value); static void set_fileName(oop element, oop value); static void set_lineNumber(oop element, int value); // Create an instance of StackTraceElement static oop create(methodHandle m, int bci, TRAPS); // Debugging friend class JavaClasses; }; // Interface to java.lang.AssertionStatusDirectives objects class java_lang_AssertionStatusDirectives: AllStatic { private: enum { hc_classes_offset, hc_classEnabled_offset, hc_packages_offset, hc_packageEnabled_offset, hc_deflt_offset }; static int classes_offset; static int classEnabled_offset; static int packages_offset; static int packageEnabled_offset; static int deflt_offset; public: // Setters static void set_classes(oop obj, oop val); static void set_classEnabled(oop obj, oop val); static void set_packages(oop obj, oop val); static void set_packageEnabled(oop obj, oop val); static void set_deflt(oop obj, bool val); // Debugging friend class JavaClasses; }; class java_nio_Buffer: AllStatic { private: static int _limit_offset; public: static int limit_offset(); static void compute_offsets(); }; class sun_misc_AtomicLongCSImpl: AllStatic { private: static int _value_offset; public: static int value_offset(); static void compute_offsets(); }; class java_util_concurrent_locks_AbstractOwnableSynchronizer : AllStatic { private: static int _owner_offset; public: static void initialize(TRAPS); static oop get_owner_threadObj(oop obj); }; // Use to declare fields that need to be injected into Java classes // for the JVM to use. The name_index and signature_index are // declared in vmSymbols. The may_be_java flag is used to declare // fields that might already exist in Java but should be injected if // they don't. Otherwise the field is unconditionally injected and // the JVM uses the injected one. This is to ensure that name // collisions don't occur. In general may_be_java should be false // unless there's a good reason. class InjectedField { public: const SystemDictionary::WKID klass_id; const vmSymbols::SID name_index; const vmSymbols::SID signature_index; const bool may_be_java; klassOop klass() const { return SystemDictionary::well_known_klass(klass_id); } Symbol* name() const { return lookup_symbol(name_index); } Symbol* signature() const { return lookup_symbol(signature_index); } int compute_offset(); // Find the Symbol for this index static Symbol* lookup_symbol(int symbol_index) { return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); } }; #define DECLARE_INJECTED_FIELD_ENUM(klass, name, signature, may_be_java) \ klass##_##name##_enum, #define ALL_INJECTED_FIELDS(macro) \ CLASS_INJECTED_FIELDS(macro) \ METHODHANDLE_INJECTED_FIELDS(macro) \ DIRECTMETHODHANDLE_INJECTED_FIELDS(macro) \ MEMBERNAME_INJECTED_FIELDS(macro) \ METHODTYPEFORM_INJECTED_FIELDS(macro) // Interface to hard-coded offset checking class JavaClasses : AllStatic { private: static InjectedField _injected_fields[]; static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0; static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0; static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0; public: enum InjectedFieldID { ALL_INJECTED_FIELDS(DECLARE_INJECTED_FIELD_ENUM) MAX_enum }; static int compute_injected_offset(InjectedFieldID id); static void compute_hard_coded_offsets(); static void compute_offsets(); static void check_offsets() PRODUCT_RETURN; static InjectedField* get_injected(Symbol* class_name, int* field_count); }; #undef DECLARE_INJECTED_FIELD_ENUM #endif // SHARE_VM_CLASSFILE_JAVACLASSES_HPP