8182397: Race in field updates when creating ArrayKlasses can lead to crash
Summary: Update array_klass field in component mirror after klass.java_mirror field for concurrent readers in compiled code
Reviewed-by: aph, kbarrett
/*
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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
* 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
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* questions.
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*/
#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:
static int value_offset;
static int hash_offset;
static int coder_offset;
static bool initialized;
static Handle basic_create(int length, bool byte_arr, TRAPS);
static inline void set_coder(oop string, jbyte coder);
public:
// Coders
enum Coder {
CODER_LATIN1 = 0,
CODER_UTF16 = 1
};
static void compute_offsets();
// Instance creation
static Handle create_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 void set_compact_strings(bool value);
static int value_offset_in_bytes() {
assert(initialized && (value_offset > 0), "Must be initialized");
return value_offset;
}
static int hash_offset_in_bytes() {
assert(initialized && (hash_offset > 0), "Must be initialized");
return hash_offset;
}
static int coder_offset_in_bytes() {
assert(initialized && (coder_offset > 0), "Must be initialized");
return coder_offset;
}
static inline void set_value_raw(oop string, typeArrayOop buffer);
static inline void set_value(oop string, typeArrayOop buffer);
static inline void set_hash(oop string, unsigned int hash);
// Accessors
static inline typeArrayOop value(oop java_string);
static inline unsigned int hash(oop java_string);
static inline bool is_latin1(oop java_string);
static inline int length(oop java_string);
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_utf8_string(oop java_string, int start, int len, char* buf, int buflen);
static char* as_platform_dependent_str(Handle java_string, TRAPS);
static jchar* as_unicode_string(oop java_string, int& length, TRAPS);
// produce an ascii string with all other values quoted using \u####
static char* as_quoted_ascii(oop java_string);
// Compute the hash value for a java.lang.String object which would
// contain the characters passed in.
//
// As the hash value used by the String object itself, in
// String.hashCode(). This value is normally calculated in Java code
// in the String.hashCode method(), but is precomputed for String
// objects in the shared archive file.
// hash P(31) from Kernighan & Ritchie
//
// For this reason, THIS ALGORITHM MUST MATCH String.hashCode().
static unsigned int hash_code(const jchar* s, int len) {
unsigned int h = 0;
while (len-- > 0) {
h = 31*h + (unsigned int) *s;
s++;
}
return h;
}
static unsigned int hash_code(const jbyte* s, int len) {
unsigned int h = 0;
while (len-- > 0) {
h = 31*h + (((unsigned int) *s) & 0xFF);
s++;
}
return h;
}
static unsigned int hash_code(oop java_string);
static bool equals(oop java_string, jchar* chars, int len);
static bool equals(oop str1, oop str2);
// 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(oop java_string, TRAPS);
static Symbol* as_symbol_or_null(oop java_string);
// Testers
static bool is_instance(oop obj);
static inline bool is_instance_inlined(oop obj);
// Debugging
static void print(oop java_string, outputStream* st);
friend class JavaClasses;
friend class StringTable;
};
// Interface to java.lang.Class objects
#define CLASS_INJECTED_FIELDS(macro) \
macro(java_lang_Class, klass, intptr_signature, false) \
macro(java_lang_Class, array_klass, intptr_signature, false) \
macro(java_lang_Class, oop_size, int_signature, false) \
macro(java_lang_Class, static_oop_field_count, int_signature, false) \
macro(java_lang_Class, protection_domain, object_signature, false) \
macro(java_lang_Class, signers, object_signature, false)
class java_lang_Class : AllStatic {
friend class VMStructs;
friend class JVMCIVMStructs;
private:
// The fake offsets are added by the class loader when java.lang.Class is loaded
static int _klass_offset;
static int _array_klass_offset;
static int _oop_size_offset;
static int _static_oop_field_count_offset;
static int _protection_domain_offset;
static int _init_lock_offset;
static int _signers_offset;
static int _class_loader_offset;
static int _module_offset;
static int _component_mirror_offset;
static bool offsets_computed;
static int classRedefinedCount_offset;
static GrowableArray<Klass*>* _fixup_mirror_list;
static GrowableArray<Klass*>* _fixup_module_field_list;
static void set_init_lock(oop java_class, oop init_lock);
static void set_protection_domain(oop java_class, oop protection_domain);
static void set_class_loader(oop java_class, oop class_loader);
static void set_component_mirror(oop java_class, oop comp_mirror);
static void initialize_mirror_fields(Klass* k, Handle mirror, Handle protection_domain, TRAPS);
static void set_mirror_module_field(Klass* K, Handle mirror, Handle module, TRAPS);
public:
static void compute_offsets();
// Instance creation
static void create_mirror(Klass* k, Handle class_loader, Handle module,
Handle protection_domain, TRAPS);
static void fixup_mirror(Klass* k, TRAPS);
static oop create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS);
static void fixup_module_field(Klass* k, Handle module);
// Conversion
static Klass* as_Klass(oop java_class);
static void set_klass(oop java_class, Klass* klass);
static BasicType as_BasicType(oop java_class, Klass** reference_klass = NULL);
static Symbol* as_signature(oop java_class, bool intern_if_not_found, TRAPS);
static void print_signature(oop java_class, outputStream *st);
static const char* as_external_name(oop java_class);
// Testing
static bool is_instance(oop obj);
static bool is_primitive(oop java_class);
static BasicType primitive_type(oop java_class);
static oop primitive_mirror(BasicType t);
// JVM_NewArray support
static Klass* array_klass(oop java_class);
static void release_set_array_klass(oop java_class, Klass* klass);
// compiler support for class operations
static int klass_offset_in_bytes() { return _klass_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);
// Support for embedded per-class oops
static oop protection_domain(oop java_class);
static oop init_lock(oop java_class);
static oop component_mirror(oop java_class);
static objArrayOop signers(oop java_class);
static void set_signers(oop java_class, objArrayOop signers);
static oop class_loader(oop java_class);
static void set_module(oop java_class, oop module);
static oop module(oop java_class);
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);
static GrowableArray<Klass*>* fixup_mirror_list() {
return _fixup_mirror_list;
}
static void set_fixup_mirror_list(GrowableArray<Klass*>* v) {
_fixup_mirror_list = v;
}
static GrowableArray<Klass*>* fixup_module_field_list() {
return _fixup_module_field_list;
}
static void set_fixup_module_field_list(GrowableArray<Klass*>* v) {
_fixup_module_field_list = v;
}
// 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 oop name(oop java_thread);
static void set_name(oop java_thread, oop 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 _nthreads_offset;
static int _ngroups_offset;
static void compute_offsets();
public:
// parent ThreadGroup
static oop parent(oop java_thread_group);
// name
static const char* 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);
// Debugging
friend class JavaClasses;
};
// Interface to java.lang.Throwable objects
class java_lang_Throwable: AllStatic {
friend class BacktraceBuilder;
friend class BacktraceIterator;
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_mirrors_offset = 2,
trace_names_offset = 3,
trace_next_offset = 4,
trace_size = 5,
trace_chunk_size = 32
};
static int backtrace_offset;
static int detailMessage_offset;
static int stackTrace_offset;
static int depth_offset;
static int static_unassigned_stacktrace_offset;
// StackTrace (programmatic access, new since 1.4)
static void clear_stacktrace(oop throwable);
// 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);
static int depth(oop throwable);
static void set_depth(oop throwable, int 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 void set_message(oop throwable, oop value);
static Symbol* detail_message(oop throwable);
static void print_stack_element(outputStream *st, const methodHandle& method, int bci);
static void print_stack_usage(Handle stream);
static void compute_offsets();
// 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, const methodHandle& method, TRAPS);
static void fill_in_stack_trace(Handle throwable, const methodHandle& method = methodHandle());
// Programmatic access to stack trace
static void get_stack_trace_elements(Handle throwable, objArrayHandle stack_trace, TRAPS);
// Printing
static void print(oop throwable, outputStream* st);
static void print_stack_trace(Handle throwable, outputStream* st);
static void java_printStackTrace(Handle throwable, TRAPS);
// 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 int type_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 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);
static bool has_type_annotations_field();
static oop type_annotations(oop method);
static void set_type_annotations(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 int type_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);
static bool has_type_annotations_field();
static oop type_annotations(oop constructor);
static void set_type_annotations(oop constructor, 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 int type_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);
static bool has_type_annotations_field();
static oop type_annotations(oop field);
static void set_type_annotations(oop field, oop value);
// Debugging
friend class JavaClasses;
};
class java_lang_reflect_Parameter {
private:
// Note that to reduce dependencies on the JDK we compute these
// offsets at run-time.
static int name_offset;
static int modifiers_offset;
static int index_offset;
static int executable_offset;
static void compute_offsets();
public:
// Allocation
static Handle create(TRAPS);
// Accessors
static oop name(oop field);
static void set_name(oop field, oop value);
static int index(oop reflect);
static void set_index(oop reflect, int value);
static int modifiers(oop reflect);
static void set_modifiers(oop reflect, int value);
static oop executable(oop constructor);
static void set_executable(oop constructor, oop value);
friend class JavaClasses;
};
#define MODULE_INJECTED_FIELDS(macro) \
macro(java_lang_Module, module_entry, intptr_signature, false)
class java_lang_Module {
private:
static int loader_offset;
static int name_offset;
static int _module_entry_offset;
static void compute_offsets();
public:
// Allocation
static Handle create(Handle loader, Handle module_name, TRAPS);
// Testers
static bool is_instance(oop obj);
// Accessors
static oop loader(oop module);
static void set_loader(oop module, oop value);
static oop name(oop module);
static void set_name(oop module, oop value);
static ModuleEntry* module_entry(oop module, TRAPS);
static void set_module_entry(oop module, ModuleEntry* module_entry);
friend class JavaClasses;
};
// Interface to jdk.internal.reflect.ConstantPool objects
class reflect_ConstantPool {
private:
// Note that to reduce dependencies on the JDK we compute these
// offsets at run-time.
static int _oop_offset;
static void compute_offsets();
public:
// Allocation
static Handle create(TRAPS);
// Accessors
static void set_cp(oop reflect, ConstantPool* value);
static int oop_offset() {
return _oop_offset;
}
static ConstantPool* get_cp(oop reflect);
// Debugging
friend class JavaClasses;
};
// Interface to jdk.internal.reflect.UnsafeStaticFieldAccessorImpl objects
class 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.
};
static int referent_offset;
static int queue_offset;
static int next_offset;
static int discovered_offset;
static int number_of_fake_oop_fields;
// Accessors
static inline oop referent(oop ref);
static inline void set_referent(oop ref, oop value);
static inline void set_referent_raw(oop ref, oop value);
static inline HeapWord* referent_addr(oop ref);
static inline oop next(oop ref);
static inline void set_next(oop ref, oop value);
static inline void set_next_raw(oop ref, oop value);
static inline HeapWord* next_addr(oop ref);
static inline oop discovered(oop ref);
static inline void set_discovered(oop ref, oop value);
static inline void set_discovered_raw(oop ref, oop value);
static inline HeapWord* discovered_addr(oop ref);
};
// 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
class MethodHandleEntry;
class java_lang_invoke_MethodHandle: AllStatic {
friend class JavaClasses;
private:
static int _type_offset; // the MethodType of this MH
static int _form_offset; // the LambdaForm of this MH
static void compute_offsets();
public:
// Accessors
static oop type(oop mh);
static void set_type(oop mh, oop mtype);
static oop form(oop mh);
static void set_form(oop mh, oop lform);
// Testers
static bool is_subclass(Klass* klass) {
return klass->is_subclass_of(SystemDictionary::MethodHandle_klass());
}
static bool is_instance(oop obj);
// Accessors for code generation:
static int type_offset_in_bytes() { return _type_offset; }
static int form_offset_in_bytes() { return _form_offset; }
};
// Interface to java.lang.invoke.DirectMethodHandle objects
class java_lang_invoke_DirectMethodHandle: AllStatic {
friend class JavaClasses;
private:
static int _member_offset; // the MemberName of this DMH
static void compute_offsets();
public:
// Accessors
static oop member(oop mh);
// Testers
static bool is_subclass(Klass* klass) {
return klass->is_subclass_of(SystemDictionary::DirectMethodHandle_klass());
}
static bool is_instance(oop obj);
// Accessors for code generation:
static int member_offset_in_bytes() { return _member_offset; }
};
// Interface to java.lang.invoke.LambdaForm objects
// (These are a private interface for managing adapter code generation.)
class java_lang_invoke_LambdaForm: AllStatic {
friend class JavaClasses;
private:
static int _vmentry_offset; // type is MemberName
static void compute_offsets();
public:
// Accessors
static oop vmentry(oop lform);
static void set_vmentry(oop lform, oop invoker);
// Testers
static bool is_subclass(Klass* klass) {
return SystemDictionary::LambdaForm_klass() != NULL &&
klass->is_subclass_of(SystemDictionary::LambdaForm_klass());
}
static bool is_instance(oop obj);
// Accessors for code generation:
static int vmentry_offset_in_bytes() { return _vmentry_offset; }
};
// Interface to java.lang.invoke.MemberName objects
// (These are a private interface for Java code to query the class hierarchy.)
#define RESOLVEDMETHOD_INJECTED_FIELDS(macro) \
macro(java_lang_invoke_ResolvedMethodName, vmholder, object_signature, false) \
macro(java_lang_invoke_ResolvedMethodName, vmtarget, intptr_signature, false)
class java_lang_invoke_ResolvedMethodName : AllStatic {
friend class JavaClasses;
static int _vmtarget_offset;
static int _vmholder_offset;
static void compute_offsets();
public:
static int vmtarget_offset_in_bytes() { return _vmtarget_offset; }
static Method* vmtarget(oop resolved_method);
static void set_vmtarget(oop resolved_method, Method* method);
// find or create resolved member name
static oop find_resolved_method(const methodHandle& m, TRAPS);
static bool is_instance(oop resolved_method);
};
#define MEMBERNAME_INJECTED_FIELDS(macro) \
macro(java_lang_invoke_MemberName, vmindex, intptr_signature, false)
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 ResolvedMethodName method; // holds VM-specific target value
// private intptr_t vmindex; // member index within class or interface
static int _clazz_offset;
static int _name_offset;
static int _type_offset;
static int _flags_offset;
static int _method_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);
// Link through ResolvedMethodName field to get Method*
static Method* vmtarget(oop mname);
static void set_method(oop mname, oop method);
static intptr_t vmindex(oop mname);
static void set_vmindex(oop mname, intptr_t index);
// Testers
static bool is_subclass(Klass* klass) {
return klass->is_subclass_of(SystemDictionary::MemberName_klass());
}
static bool is_instance(oop obj);
static bool is_method(oop obj);
// 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_CALLER_SENSITIVE = 0x00100000, // @CallerSensitive annotation detected
MN_REFERENCE_KIND_SHIFT = 24, // refKind
MN_REFERENCE_KIND_MASK = 0x0F000000 >> MN_REFERENCE_KIND_SHIFT,
// The SEARCH_* bits are not for MN.flags but for the matchFlags argument of MHN.getMembers:
MN_SEARCH_SUPERCLASSES = 0x00100000, // walk super classes
MN_SEARCH_INTERFACES = 0x00200000 // walk implemented interfaces
};
// 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 method_offset_in_bytes() { return _method_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 void compute_offsets();
public:
// Accessors
static oop rtype(oop mt);
static objArrayOop ptypes(oop mt);
static oop ptype(oop mt, int index);
static int ptype_count(oop mt);
static int ptype_slot_count(oop mt); // extra counts for long/double
static int rtype_slot_count(oop mt); // extra counts for long/double
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);
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; }
};
// Interface to java.lang.invoke.CallSite objects
class java_lang_invoke_CallSite: AllStatic {
friend class JavaClasses;
private:
static int _target_offset;
static int _context_offset;
static void compute_offsets();
public:
// Accessors
static oop target( oop site);
static void set_target( oop site, oop target);
static void set_target_volatile( oop site, oop target);
static oop context(oop site);
// Testers
static bool is_subclass(Klass* klass) {
return klass->is_subclass_of(SystemDictionary::CallSite_klass());
}
static bool is_instance(oop obj);
// Accessors for code generation:
static int target_offset_in_bytes() { return _target_offset; }
};
// Interface to java.lang.invoke.MethodHandleNatives$CallSiteContext objects
#define CALLSITECONTEXT_INJECTED_FIELDS(macro) \
macro(java_lang_invoke_MethodHandleNatives_CallSiteContext, vmdependencies, intptr_signature, false)
class DependencyContext;
class java_lang_invoke_MethodHandleNatives_CallSiteContext : AllStatic {
friend class JavaClasses;
private:
static int _vmdependencies_offset;
static void compute_offsets();
public:
// Accessors
static DependencyContext vmdependencies(oop context);
// Testers
static bool is_subclass(Klass* klass) {
return klass->is_subclass_of(SystemDictionary::Context_klass());
}
static bool is_instance(oop obj);
};
// 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 int _isAuthorized_offset;
static void compute_offsets();
public:
static oop create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS);
static bool is_authorized(Handle context);
// Debugging/initialization
friend class JavaClasses;
};
// Interface to java.lang.ClassLoader objects
#define CLASSLOADER_INJECTED_FIELDS(macro) \
macro(java_lang_ClassLoader, loader_data, intptr_signature, false)
class java_lang_ClassLoader : AllStatic {
private:
// The fake offsets are added by the class loader when java.lang.Class is loaded
enum {
hc_parent_offset = 0
};
static int _loader_data_offset;
static bool offsets_computed;
static int parent_offset;
static int parallelCapable_offset;
static int name_offset;
static int unnamedModule_offset;
public:
static void compute_offsets();
static ClassLoaderData** loader_data_addr(oop loader);
static ClassLoaderData* loader_data(oop loader);
static oop parent(oop loader);
static oop name(oop loader);
static bool isAncestor(oop loader, oop cl);
// Support for parallelCapable field
static bool parallelCapable(oop the_class_mirror);
static bool is_trusted_loader(oop loader);
// Return true if this is one of the class loaders associated with
// the generated bytecodes for reflection.
static bool is_reflection_class_loader(oop loader);
// Fix for 4474172
static oop non_reflection_class_loader(oop loader);
// Testers
static bool is_subclass(Klass* klass) {
return klass->is_subclass_of(SystemDictionary::ClassLoader_klass());
}
static bool is_instance(oop obj);
static oop unnamedModule(oop loader);
// Debugging
friend class JavaClasses;
friend class ClassFileParser; // access to number_of_fake_fields
};
// 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,
hc_static_security_offset = 3
};
static int static_in_offset;
static int static_out_offset;
static int static_err_offset;
static int static_security_offset;
public:
static int in_offset_in_bytes();
static int out_offset_in_bytes();
static int err_offset_in_bytes();
static bool has_security_manager();
// Debugging
friend class JavaClasses;
};
// Interface to java.lang.StackTraceElement objects
class java_lang_StackTraceElement: AllStatic {
private:
enum {
hc_declaringClassObject_offset = 0,
hc_classLoaderName_offset = 1,
hc_moduleName_offset = 2,
hc_moduleVersion_offset = 3,
hc_declaringClass_offset = 4,
hc_methodName_offset = 5,
hc_fileName_offset = 6,
hc_lineNumber_offset = 7
};
static int declaringClassObject_offset;
static int classLoaderName_offset;
static int moduleName_offset;
static int moduleVersion_offset;
static int declaringClass_offset;
static int methodName_offset;
static int fileName_offset;
static int lineNumber_offset;
// Setters
static void set_classLoaderName(oop element, oop value);
static void set_moduleName(oop element, oop value);
static void set_moduleVersion(oop element, oop value);
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);
static void set_declaringClassObject(oop element, oop value);
public:
// Create an instance of StackTraceElement
static oop create(const methodHandle& method, int bci, TRAPS);
static void fill_in(Handle element, InstanceKlass* holder, const methodHandle& method,
int version, int bci, Symbol* name, TRAPS);
// Debugging
friend class JavaClasses;
};
class Backtrace: AllStatic {
public:
// Helper backtrace functions to store bci|version together.
static int merge_bci_and_version(int bci, int version);
static int merge_mid_and_cpref(int mid, int cpref);
static int bci_at(unsigned int merged);
static int version_at(unsigned int merged);
static int mid_at(unsigned int merged);
static int cpref_at(unsigned int merged);
static int get_line_number(const methodHandle& method, int bci);
static Symbol* get_source_file_name(InstanceKlass* holder, int version);
// Debugging
friend class JavaClasses;
};
// Interface to java.lang.StackFrameInfo objects
#define STACKFRAMEINFO_INJECTED_FIELDS(macro) \
macro(java_lang_StackFrameInfo, version, short_signature, false)
class java_lang_StackFrameInfo: AllStatic {
private:
static int _declaringClass_offset;
static int _memberName_offset;
static int _bci_offset;
static int _version_offset;
static Method* get_method(Handle stackFrame, InstanceKlass* holder, TRAPS);
public:
// Setters
static void set_declaringClass(oop info, oop value);
static void set_method_and_bci(Handle stackFrame, const methodHandle& method, int bci, TRAPS);
static void set_bci(oop info, int value);
static void set_version(oop info, short value);
static void compute_offsets();
static void to_stack_trace_element(Handle stackFrame, Handle stack_trace_element, TRAPS);
// Debugging
friend class JavaClasses;
};
class java_lang_LiveStackFrameInfo: AllStatic {
private:
static int _monitors_offset;
static int _locals_offset;
static int _operands_offset;
static int _mode_offset;
public:
static void set_monitors(oop info, oop value);
static void set_locals(oop info, oop value);
static void set_operands(oop info, oop value);
static void set_mode(oop info, int value);
static void compute_offsets();
// 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 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;
Klass* 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) \
CLASSLOADER_INJECTED_FIELDS(macro) \
RESOLVEDMETHOD_INJECTED_FIELDS(macro) \
MEMBERNAME_INJECTED_FIELDS(macro) \
CALLSITECONTEXT_INJECTED_FIELDS(macro) \
STACKFRAMEINFO_INJECTED_FIELDS(macro) \
MODULE_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