/*

 * 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

class java_lang_Class : AllStatic {

   friend class VMStructs;

 private:

  // The fake offsets are added by the class loader when java.lang.Class is loaded

  enum {

    hc_number_of_fake_oop_fields   = 3,

    hc_number_of_fake_int_fields   = 2

  };

  static int klass_offset;

  static int resolved_constructor_offset;

  static int array_klass_offset;

  static int number_of_fake_oop_fields;

  static int oop_size_offset;

  static int static_oop_field_count_offset;

  static void compute_offsets();

  static bool offsets_computed;

  static int classRedefinedCount_offset;

  static int parallelCapable_offset;

 public:

  // 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 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);

  // Support for parallelCapable field

  static bool parallelCapable(oop the_class_mirror);

  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);