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 /*

  * Copyright (c) 1998, 2010, 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.

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  */

 #ifndef SHARE_VM_PRIMS_JVMTIEXPORT_HPP

 #define SHARE_VM_PRIMS_JVMTIEXPORT_HPP

 #include "jvmtifiles/jvmti.h"

 #include "memory/allocation.hpp"

 #include "memory/iterator.hpp"

 #include "oops/oop.hpp"

 #include "oops/oopsHierarchy.hpp"

 #include "runtime/frame.hpp"

 #include "runtime/handles.hpp"

 #include "utilities/globalDefinitions.hpp"

 #include "utilities/growableArray.hpp"

 // Must be included after jvmti.h.

 #include "code/jvmticmlr.h"

 // Forward declarations

 class JvmtiEventControllerPrivate;

 class JvmtiManageCapabilities;

 class JvmtiEnv;

 class JvmtiThreadState;

 class AttachOperation;

 #ifndef JVMTI_KERNEL

 #define JVMTI_SUPPORT_FLAG(key)                                         \

   private:                                                              \

   static bool  _##key;                                                  \

   public:                                                               \

   inline static void set_##key(bool on)       { _##key = (on != 0); }   \

   inline static bool key()                    { return _##key; }

 #else  // JVMTI_KERNEL

 #define JVMTI_SUPPORT_FLAG(key)                                           \

   private:                                                                \

   const static bool _##key = false;                                       \

   public:                                                                 \

   inline static void set_##key(bool on)       { report_unsupported(on); } \

   inline static bool key()                    { return _##key; }

 #endif // JVMTI_KERNEL

 // This class contains the JVMTI interface for the rest of hotspot.

 //

 class JvmtiExport : public AllStatic {

  private:

   static int         _field_access_count;

   static int         _field_modification_count;

   static bool        _can_access_local_variables;

   static bool        _can_hotswap_or_post_breakpoint;

   static bool        _can_modify_any_class;

   static bool        _can_walk_any_space;

   JVMTI_SUPPORT_FLAG(can_get_source_debug_extension)

   JVMTI_SUPPORT_FLAG(can_maintain_original_method_order)

   JVMTI_SUPPORT_FLAG(can_post_interpreter_events)

   JVMTI_SUPPORT_FLAG(can_post_on_exceptions)

   JVMTI_SUPPORT_FLAG(can_post_breakpoint)

   JVMTI_SUPPORT_FLAG(can_post_field_access)

   JVMTI_SUPPORT_FLAG(can_post_field_modification)

   JVMTI_SUPPORT_FLAG(can_post_method_entry)

   JVMTI_SUPPORT_FLAG(can_post_method_exit)

   JVMTI_SUPPORT_FLAG(can_pop_frame)

   JVMTI_SUPPORT_FLAG(can_force_early_return)

   friend class JvmtiEventControllerPrivate;  // should only modify these flags

   JVMTI_SUPPORT_FLAG(should_post_single_step)

   JVMTI_SUPPORT_FLAG(should_post_field_access)

   JVMTI_SUPPORT_FLAG(should_post_field_modification)

   JVMTI_SUPPORT_FLAG(should_post_class_load)

   JVMTI_SUPPORT_FLAG(should_post_class_prepare)

   JVMTI_SUPPORT_FLAG(should_post_class_unload)

   JVMTI_SUPPORT_FLAG(should_post_native_method_bind)

   JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)

   JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)

   JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)

   JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)

   JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)

   JVMTI_SUPPORT_FLAG(should_post_monitor_wait)

   JVMTI_SUPPORT_FLAG(should_post_monitor_waited)

   JVMTI_SUPPORT_FLAG(should_post_data_dump)

   JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)

   JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)

   JVMTI_SUPPORT_FLAG(should_post_on_exceptions)

   // ------ the below maybe don't have to be (but are for now)

   // fixed conditions here ------------

   // any events can be enabled

   JVMTI_SUPPORT_FLAG(should_post_thread_life)

   JVMTI_SUPPORT_FLAG(should_post_object_free)

   JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)

   // we are holding objects on the heap - need to talk to GC - e.g.

   // breakpoint info

   JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)

   JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)

   // If flag cannot be implemented, give an error if on=true

   static void report_unsupported(bool on);

   // these should only be called by the friend class

   friend class JvmtiManageCapabilities;

   inline static void set_can_modify_any_class(bool on)                 { _can_modify_any_class = (on != 0); }

   inline static void set_can_access_local_variables(bool on)           { _can_access_local_variables = (on != 0); }

   inline static void set_can_hotswap_or_post_breakpoint(bool on)       { _can_hotswap_or_post_breakpoint = (on != 0); }

   inline static void set_can_walk_any_space(bool on)                   { _can_walk_any_space = (on != 0); }

   enum {

     JVMTI_VERSION_MASK   = 0x70000000,

     JVMTI_VERSION_VALUE  = 0x30000000,

     JVMDI_VERSION_VALUE  = 0x20000000

   };

   static void post_field_modification(JavaThread *thread, methodOop method, address location,

                                       KlassHandle field_klass, Handle object, jfieldID field,

                                       char sig_type, jvalue *value);

  private:

   // CompiledMethodUnload events are reported from the VM thread so they

   // are collected in lists (of jmethodID/addresses) and the events are posted later

   // from threads posting CompieldMethodLoad or DynamicCodeGenerated events.

   static bool _have_pending_compiled_method_unload_events;

   static GrowableArray<jmethodID>* _pending_compiled_method_unload_method_ids;

   static GrowableArray<const void *>* _pending_compiled_method_unload_code_begins;

   static JavaThread* _current_poster;

   // tests if there are CompiledMethodUnload events pending

   inline static bool have_pending_compiled_method_unload_events() {

     return _have_pending_compiled_method_unload_events;

   }

   // posts any pending CompiledMethodUnload events.

   static void post_pending_compiled_method_unload_events();

   // Perform the actual notification to interested JvmtiEnvs.

   static void post_compiled_method_unload_internal(JavaThread* self, jmethodID mid, const void* code_begin);

   // posts a DynamicCodeGenerated event (internal/private implementation).

   // The public post_dynamic_code_generated* functions make use of the

   // internal implementation.

   static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;

   // GenerateEvents support to allow posting of CompiledMethodLoad and

   // DynamicCodeGenerated events for a given environment.

   friend class JvmtiCodeBlobEvents;

   static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,

                                         const void *code_begin, const jint map_length,

                                         const jvmtiAddrLocationMap* map) KERNEL_RETURN;

   static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,

                                           const void *code_end) KERNEL_RETURN;

   // The RedefineClasses() API breaks some invariants in the "regular"

   // system. For example, there are sanity checks when GC'ing nmethods

   // that require the containing class to be unloading. However, when a

   // method is redefined, the old method and nmethod can become GC'able

   // without the containing class unloading. The state of becoming

   // GC'able can be asynchronous to the RedefineClasses() call since

   // the old method may still be running and cannot be GC'ed until

   // after all old invocations have finished. Additionally, a method

   // that has not been redefined may have an nmethod that depends on

   // the redefined method. The dependent nmethod will get deopted in

   // this case and may also be GC'able without the containing class

   // being unloaded.

   //

   // This flag indicates whether RedefineClasses() has ever redefined

   // one or more classes during the lifetime of the VM. The flag should

   // only be set by the friend class and can be queried by other sub

   // systems as needed to relax invariant checks.

   static bool _has_redefined_a_class;

   friend class VM_RedefineClasses;

   inline static void set_has_redefined_a_class() {

     _has_redefined_a_class = true;

   }

   // Flag to indicate if the compiler has recorded all dependencies. When the

   // can_redefine_classes capability is enabled in the OnLoad phase then the compiler

   // records all dependencies from startup. However if the capability is first

   // enabled some time later then the dependencies recorded by the compiler

   // are incomplete. This flag is used by RedefineClasses to know if the

   // dependency information is complete or not.

   static bool _all_dependencies_are_recorded;

  public:

   inline static bool has_redefined_a_class() {

     return _has_redefined_a_class;

   }

   inline static bool all_dependencies_are_recorded() {

     return _all_dependencies_are_recorded;

   }

   inline static void set_all_dependencies_are_recorded(bool on) {

     _all_dependencies_are_recorded = (on != 0);

   }

   // let JVMTI know that the JVM_OnLoad code is running

   static void enter_onload_phase();

   // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)

   static void enter_primordial_phase();

   // let JVMTI know that the VM isn't up yet but JNI is live

   static void enter_start_phase();

   // let JVMTI know that the VM is fully up and running now

   static void enter_live_phase();

   // ------ can_* conditions (below) are set at OnLoad and never changed ------------

   inline static bool can_modify_any_class()                       { return _can_modify_any_class; }

   inline static bool can_access_local_variables()                 { return _can_access_local_variables; }

   inline static bool can_hotswap_or_post_breakpoint()             { return _can_hotswap_or_post_breakpoint; }

   inline static bool can_walk_any_space()                         { return _can_walk_any_space; }

   // field access management

   static address  get_field_access_count_addr();

   // field modification management

   static address  get_field_modification_count_addr();

   // -----------------

   static bool is_jvmti_version(jint version)                      { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; }

   static bool is_jvmdi_version(jint version)                      { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; }

   static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version);

   static void decode_version_values(jint version, int * major, int * minor,

                                     int * micro);

   // single stepping management methods

   static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN;

   static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN;

   static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;);

   // Methods that notify the debugger that something interesting has happened in the VM.

   static void post_vm_start              ();

   static void post_vm_initialized        ();

   static void post_vm_death              ();

   static void post_single_step           (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;

   static void post_raw_breakpoint        (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;

   static void post_exception_throw       (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN;

   static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN;

   static oop jni_GetField_probe          (JavaThread *thread, jobject jobj,

     oop obj, klassOop klass, jfieldID fieldID, bool is_static)

     KERNEL_RETURN_(return NULL;);

   static oop jni_GetField_probe_nh       (JavaThread *thread, jobject jobj,

     oop obj, klassOop klass, jfieldID fieldID, bool is_static)

     KERNEL_RETURN_(return NULL;);

   static void post_field_access_by_jni   (JavaThread *thread, oop obj,

     klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN;

   static void post_field_access          (JavaThread *thread, methodOop method,

     address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN;

   static oop jni_SetField_probe          (JavaThread *thread, jobject jobj,

     oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,

     jvalue *value) KERNEL_RETURN_(return NULL;);

   static oop jni_SetField_probe_nh       (JavaThread *thread, jobject jobj,

     oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,

     jvalue *value) KERNEL_RETURN_(return NULL;);

   static void post_field_modification_by_jni(JavaThread *thread, oop obj,

     klassOop klass, jfieldID fieldID, bool is_static, char sig_type,

     jvalue *value);

   static void post_raw_field_modification(JavaThread *thread, methodOop method,

     address location, KlassHandle field_klass, Handle object, jfieldID field,

     char sig_type, jvalue *value) KERNEL_RETURN;

   static void post_method_entry          (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;

   static void post_method_exit           (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;

   static void post_class_load            (JavaThread *thread, klassOop klass) KERNEL_RETURN;

   static void post_class_unload          (klassOop klass) KERNEL_RETURN;

   static void post_class_prepare         (JavaThread *thread, klassOop klass) KERNEL_RETURN;

   static void post_thread_start          (JavaThread *thread) KERNEL_RETURN;

   static void post_thread_end            (JavaThread *thread) KERNEL_RETURN;

   // Support for java.lang.instrument agent loading.

   static bool _should_post_class_file_load_hook;

   inline static void set_should_post_class_file_load_hook(bool on)     { _should_post_class_file_load_hook = on;  }

   inline static bool should_post_class_file_load_hook()           { return _should_post_class_file_load_hook; }

   static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader,

                                         Handle h_protection_domain,

                                         unsigned char **data_ptr, unsigned char **end_ptr,

                                         unsigned char **cached_data_ptr,

                                         jint *cached_length_ptr);

   static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN;

   static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN;

   static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;

   // used to post a CompiledMethodUnload event

   static void post_compiled_method_unload(jmethodID mid, const void *code_begin) KERNEL_RETURN;

   // similiar to post_dynamic_code_generated except that it can be used to

   // post a DynamicCodeGenerated event while holding locks in the VM. Any event

   // posted using this function is recorded by the enclosing event collector

   // -- JvmtiDynamicCodeEventCollector.

   static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN;

   static void post_garbage_collection_finish() KERNEL_RETURN;

   static void post_garbage_collection_start() KERNEL_RETURN;

   static void post_data_dump() KERNEL_RETURN;

   static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;

   static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;

   static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN;

   static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN;

   static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN;

   static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN;

   static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN;

   // Post objects collected by vm_object_alloc_event_collector.

   static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN;

   // Collects vm internal objects for later event posting.

   inline static void vm_object_alloc_event_collector(oop object) {

     if (should_post_vm_object_alloc()) {

       record_vm_internal_object_allocation(object);

     }

   }

   static void cleanup_thread             (JavaThread* thread) KERNEL_RETURN;

   static void oops_do(OopClosure* f) KERNEL_RETURN;

   static void transition_pending_onload_raw_monitors() KERNEL_RETURN;

 #ifndef SERVICES_KERNEL

   // attach support

   static jint load_agent_library(AttachOperation* op, outputStream* out);

 #endif // SERVICES_KERNEL

   // SetNativeMethodPrefix support

   static char** get_all_native_method_prefixes(int* count_ptr);

 };

 // Support class used by JvmtiDynamicCodeEventCollector and others. It

 // describes a single code blob by name and address range.

 class JvmtiCodeBlobDesc : public CHeapObj {

  private:

   char _name[64];

   address _code_begin;

   address _code_end;

  public:

   JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {

     assert(name != NULL, "all code blobs must be named");

     strncpy(_name, name, sizeof(_name));

     _name[sizeof(_name)-1] = '\0';

     _code_begin = code_begin;

     _code_end = code_end;

   }

   char* name()                  { return _name; }

   address code_begin()          { return _code_begin; }

   address code_end()            { return _code_end; }

 };

 // JvmtiEventCollector is a helper class to setup thread for

 // event collection.

 class JvmtiEventCollector : public StackObj {

  private:

   JvmtiEventCollector* _prev;  // Save previous one to support nested event collector.

  public:

   void setup_jvmti_thread_state(); // Set this collector in current thread.

   void unset_jvmti_thread_state(); // Reset previous collector in current thread.

   virtual bool is_dynamic_code_event()   { return false; }

   virtual bool is_vm_object_alloc_event(){ return false; }

   JvmtiEventCollector *get_prev()        { return _prev; }

 };

 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport

 // interface. It collects "dynamic code generated" events that are posted

 // while holding locks. When the event collector goes out of scope the

 // events will be posted.

 //

 // Usage :-

 //

 // {

 //   JvmtiDynamicCodeEventCollector event_collector;

 //   :

 //   { MutexLocker ml(...)

 //     :

 //     JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)

 //   }

 //   // event collector goes out of scope => post events to profiler.

 // }

 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {

  private:

   GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs;           // collected code blob events

   friend class JvmtiExport;

   void register_stub(const char* name, address start, address end);

  public:

   JvmtiDynamicCodeEventCollector()  KERNEL_RETURN;

   ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN;

   bool is_dynamic_code_event()   { return true; }

 };

 // Used to record vm internally allocated object oops and post

 // vm object alloc event for objects visible to java world.

 // Constructor enables JvmtiThreadState flag and all vm allocated

 // objects are recorded in a growable array. When destructor is

 // called the vm object alloc event is posted for each objects

 // visible to java world.

 // See jvm.cpp file for its usage.

 //

 class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector {

  private:

   GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop.

   bool _enable;                   // This flag is enabled in constructor and disabled

                                   // in destructor before posting event. To avoid

                                   // collection of objects allocated while running java code inside

                                   // agent post_vm_object_alloc() event handler.

   //GC support

   void oops_do(OopClosure* f);

   friend class JvmtiExport;

   // Record vm allocated object oop.

   inline void record_allocation(oop obj);

   //GC support

   static void oops_do_for_all_threads(OopClosure* f);

  public:

   JvmtiVMObjectAllocEventCollector()  KERNEL_RETURN;

   ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;

   bool is_vm_object_alloc_event()   { return true; }

   bool is_enabled()                 { return _enable; }

   void set_enabled(bool on)         { _enable = on; }

 };

 // Marker class to disable the posting of VMObjectAlloc events

 // within its scope.

 //

 // Usage :-

 //

 // {

 //   NoJvmtiVMObjectAllocMark njm;

 //   :

 //   // VMObjAlloc event will not be posted

 //   JvmtiExport::vm_object_alloc_event_collector(obj);

 //   :

 // }

 class NoJvmtiVMObjectAllocMark : public StackObj {

  private:

   // enclosing collector if enabled, NULL otherwise

   JvmtiVMObjectAllocEventCollector *_collector;

   bool was_enabled()    { return _collector != NULL; }

  public:

   NoJvmtiVMObjectAllocMark() KERNEL_RETURN;

   ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN;

 };

 // Base class for reporting GC events to JVMTI.

 class JvmtiGCMarker : public StackObj {

  public:

   JvmtiGCMarker() KERNEL_RETURN;

   ~JvmtiGCMarker() KERNEL_RETURN;

 };

 // JvmtiHideSingleStepping is a helper class for hiding

 // internal single step events.

 class JvmtiHideSingleStepping : public StackObj {

  private:

   bool         _single_step_hidden;

   JavaThread * _thread;

  public:

   JvmtiHideSingleStepping(JavaThread * thread) {

     assert(thread != NULL, "sanity check");

     _single_step_hidden = false;

     _thread = thread;

     if (JvmtiExport::should_post_single_step()) {

       _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);

     }

   }

   ~JvmtiHideSingleStepping() {

     if (_single_step_hidden) {

       JvmtiExport::expose_single_stepping(_thread);

     }

   }

 };

 #endif // SHARE_VM_PRIMS_JVMTIEXPORT_HPP