hotspot/src/share/vm/prims/jvmtiExport.hpp
author duke
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/*
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 * Copyright 1998-2006 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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#ifndef _JAVA_JVMTIEXPORT_H_
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#define _JAVA_JVMTIEXPORT_H_
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// Forward declarations
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class JvmtiEventControllerPrivate;
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class JvmtiManageCapabilities;
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class JvmtiEnv;
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class JvmtiThreadState;
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class AttachOperation;
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#ifndef JVMTI_KERNEL
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#define JVMTI_SUPPORT_FLAG(key)                                         \
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  private:                                                              \
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  static bool  _##key;                                                  \
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  public:                                                               \
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  inline static void set_##key(bool on)       { _##key = (on != 0); }   \
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  inline static bool key()                    { return _##key; }
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#else  // JVMTI_KERNEL
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#define JVMTI_SUPPORT_FLAG(key)                                           \
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  private:                                                                \
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  const static bool _##key = false;                                       \
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  public:                                                                 \
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  inline static void set_##key(bool on)       { report_unsupported(on); } \
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  inline static bool key()                    { return _##key; }
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#endif // JVMTI_KERNEL
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// This class contains the JVMTI interface for the rest of hotspot.
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//
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class JvmtiExport : public AllStatic {
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 private:
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  static int         _field_access_count;
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  static int         _field_modification_count;
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  static bool        _can_access_local_variables;
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  static bool        _can_examine_or_deopt_anywhere;
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  static bool        _can_hotswap_or_post_breakpoint;
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  static bool        _can_modify_any_class;
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  static bool        _can_walk_any_space;
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  JVMTI_SUPPORT_FLAG(can_get_source_debug_extension)
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  JVMTI_SUPPORT_FLAG(can_maintain_original_method_order)
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  JVMTI_SUPPORT_FLAG(can_post_interpreter_events)
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  JVMTI_SUPPORT_FLAG(can_post_exceptions)
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  JVMTI_SUPPORT_FLAG(can_post_breakpoint)
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  JVMTI_SUPPORT_FLAG(can_post_field_access)
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  JVMTI_SUPPORT_FLAG(can_post_field_modification)
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  JVMTI_SUPPORT_FLAG(can_post_method_entry)
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  JVMTI_SUPPORT_FLAG(can_post_method_exit)
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  JVMTI_SUPPORT_FLAG(can_pop_frame)
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  JVMTI_SUPPORT_FLAG(can_force_early_return)
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  friend class JvmtiEventControllerPrivate;  // should only modify these flags
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  JVMTI_SUPPORT_FLAG(should_post_single_step)
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  JVMTI_SUPPORT_FLAG(should_post_field_access)
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  JVMTI_SUPPORT_FLAG(should_post_field_modification)
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  JVMTI_SUPPORT_FLAG(should_post_class_load)
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  JVMTI_SUPPORT_FLAG(should_post_class_prepare)
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  JVMTI_SUPPORT_FLAG(should_post_class_unload)
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  JVMTI_SUPPORT_FLAG(should_post_native_method_bind)
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  JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)
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  JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)
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  JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)
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  JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)
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  JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)
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  JVMTI_SUPPORT_FLAG(should_post_monitor_wait)
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  JVMTI_SUPPORT_FLAG(should_post_monitor_waited)
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  JVMTI_SUPPORT_FLAG(should_post_data_dump)
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  JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)
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  JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)
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  // ------ the below maybe don't have to be (but are for now)
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  // fixed conditions here ------------
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  // any events can be enabled
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  JVMTI_SUPPORT_FLAG(should_post_thread_life)
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  JVMTI_SUPPORT_FLAG(should_post_object_free)
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  JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)
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  // we are holding objects on the heap - need to talk to GC - e.g.
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  // breakpoint info
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  JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)
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  JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)
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  // If flag cannot be implemented, give an error if on=true
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  static void report_unsupported(bool on);
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  // these should only be called by the friend class
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  friend class JvmtiManageCapabilities;
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  inline static void set_can_examine_or_deopt_anywhere(bool on)        { _can_examine_or_deopt_anywhere = (on != 0); }
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  inline static void set_can_modify_any_class(bool on)                 { _can_modify_any_class = (on != 0); }
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  inline static void set_can_access_local_variables(bool on)           { _can_access_local_variables = (on != 0); }
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  inline static void set_can_hotswap_or_post_breakpoint(bool on)       { _can_hotswap_or_post_breakpoint = (on != 0); }
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  inline static void set_can_walk_any_space(bool on)                   { _can_walk_any_space = (on != 0); }
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  enum {
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    JVMTI_VERSION_MASK   = 0x70000000,
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    JVMTI_VERSION_VALUE  = 0x30000000,
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    JVMDI_VERSION_VALUE  = 0x20000000
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  };
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  static void post_field_modification(JavaThread *thread, methodOop method, address location,
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                                      KlassHandle field_klass, Handle object, jfieldID field,
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                                      char sig_type, jvalue *value);
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  // CompiledMethodUnload events are reported from the VM thread so they
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  // are collected in lists (of jmethodID/addresses) and the events are posted later
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  // from threads posting CompieldMethodLoad or DynamicCodeGenerated events.
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  static bool _have_pending_compiled_method_unload_events;
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  static GrowableArray<jmethodID>* _pending_compiled_method_unload_method_ids;
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  static GrowableArray<const void *>* _pending_compiled_method_unload_code_begins;
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  static JavaThread* _current_poster;
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  // tests if there are CompiledMethodUnload events pending
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  inline static bool have_pending_compiled_method_unload_events() {
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    return _have_pending_compiled_method_unload_events;
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  }
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  // posts any pending CompiledMethodUnload events.
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  static void post_pending_compiled_method_unload_events();
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  // posts a DynamicCodeGenerated event (internal/private implementation).
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  // The public post_dynamic_code_generated* functions make use of the
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  // internal implementation.
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  static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
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  // GenerateEvents support to allow posting of CompiledMethodLoad and
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  // DynamicCodeGenerated events for a given environment.
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  friend class JvmtiCodeBlobEvents;
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  static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
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                                        const void *code_begin, const jint map_length,
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                                        const jvmtiAddrLocationMap* map) KERNEL_RETURN;
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  static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,
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                                          const void *code_end) KERNEL_RETURN;
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  // The RedefineClasses() API breaks some invariants in the "regular"
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  // system. For example, there are sanity checks when GC'ing nmethods
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  // that require the containing class to be unloading. However, when a
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  // method is redefined, the old method and nmethod can become GC'able
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  // without the containing class unloading. The state of becoming
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  // GC'able can be asynchronous to the RedefineClasses() call since
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  // the old method may still be running and cannot be GC'ed until
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  // after all old invocations have finished. Additionally, a method
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  // that has not been redefined may have an nmethod that depends on
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  // the redefined method. The dependent nmethod will get deopted in
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  // this case and may also be GC'able without the containing class
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  // being unloaded.
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  //
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  // This flag indicates whether RedefineClasses() has ever redefined
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  // one or more classes during the lifetime of the VM. The flag should
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  // only be set by the friend class and can be queried by other sub
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  // systems as needed to relax invariant checks.
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  static bool _has_redefined_a_class;
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  friend class VM_RedefineClasses;
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  inline static void set_has_redefined_a_class() {
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    _has_redefined_a_class = true;
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  }
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  // Flag to indicate if the compiler has recorded all dependencies. When the
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  // can_redefine_classes capability is enabled in the OnLoad phase then the compiler
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  // records all dependencies from startup. However if the capability is first
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  // enabled some time later then the dependencies recorded by the compiler
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  // are incomplete. This flag is used by RedefineClasses to know if the
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  // dependency information is complete or not.
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  static bool _all_dependencies_are_recorded;
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 public:
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  inline static bool has_redefined_a_class() {
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    return _has_redefined_a_class;
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  }
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  inline static bool all_dependencies_are_recorded() {
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    return _all_dependencies_are_recorded;
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  }
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  inline static void set_all_dependencies_are_recorded(bool on) {
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    _all_dependencies_are_recorded = (on != 0);
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  }
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  // let JVMTI know that the JVM_OnLoad code is running
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  static void enter_onload_phase();
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  // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
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  static void enter_primordial_phase();
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  // let JVMTI know that the VM isn't up yet but JNI is live
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  static void enter_start_phase();
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  // let JVMTI know that the VM is fully up and running now
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  static void enter_live_phase();
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  // ------ can_* conditions (below) are set at OnLoad and never changed ------------
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  inline static bool can_examine_or_deopt_anywhere()              { return _can_examine_or_deopt_anywhere; }
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  inline static bool can_modify_any_class()                       { return _can_modify_any_class; }
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  inline static bool can_access_local_variables()                 { return _can_access_local_variables; }
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  inline static bool can_hotswap_or_post_breakpoint()             { return _can_hotswap_or_post_breakpoint; }
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  inline static bool can_walk_any_space()                         { return _can_walk_any_space; }
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  // field access management
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  static address  get_field_access_count_addr();
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  // field modification management
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  static address  get_field_modification_count_addr();
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  // -----------------
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  static bool is_jvmti_version(jint version)                      { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; }
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  static bool is_jvmdi_version(jint version)                      { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; }
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  static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version);
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  // single stepping management methods
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  static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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  static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN;
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  static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;);
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  // Methods that notify the debugger that something interesting has happened in the VM.
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  static void post_vm_start              ();
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  static void post_vm_initialized        ();
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  static void post_vm_death              ();
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  static void post_single_step           (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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  static void post_raw_breakpoint        (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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  static void post_exception_throw       (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN;
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  static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN;
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  static oop jni_GetField_probe          (JavaThread *thread, jobject jobj,
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    oop obj, klassOop klass, jfieldID fieldID, bool is_static)
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    KERNEL_RETURN_(return NULL;);
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  static oop jni_GetField_probe_nh       (JavaThread *thread, jobject jobj,
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    oop obj, klassOop klass, jfieldID fieldID, bool is_static)
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    KERNEL_RETURN_(return NULL;);
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  static void post_field_access_by_jni   (JavaThread *thread, oop obj,
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    klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN;
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  static void post_field_access          (JavaThread *thread, methodOop method,
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    address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN;
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  static oop jni_SetField_probe          (JavaThread *thread, jobject jobj,
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    oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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    jvalue *value) KERNEL_RETURN_(return NULL;);
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  static oop jni_SetField_probe_nh       (JavaThread *thread, jobject jobj,
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    oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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    jvalue *value) KERNEL_RETURN_(return NULL;);
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  static void post_field_modification_by_jni(JavaThread *thread, oop obj,
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    klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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    jvalue *value);
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  static void post_raw_field_modification(JavaThread *thread, methodOop method,
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    address location, KlassHandle field_klass, Handle object, jfieldID field,
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    char sig_type, jvalue *value) KERNEL_RETURN;
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  static void post_method_entry          (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
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  static void post_method_exit           (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
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  static void post_class_load            (JavaThread *thread, klassOop klass) KERNEL_RETURN;
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  static void post_class_unload          (klassOop klass) KERNEL_RETURN;
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  static void post_class_prepare         (JavaThread *thread, klassOop klass) KERNEL_RETURN;
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  static void post_thread_start          (JavaThread *thread) KERNEL_RETURN;
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  static void post_thread_end            (JavaThread *thread) KERNEL_RETURN;
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  // Support for java.lang.instrument agent loading.
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  static bool _should_post_class_file_load_hook;
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  inline static void set_should_post_class_file_load_hook(bool on)     { _should_post_class_file_load_hook = on;  }
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  inline static bool should_post_class_file_load_hook()           { return _should_post_class_file_load_hook; }
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  static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader,
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                                        Handle h_protection_domain,
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                                        unsigned char **data_ptr, unsigned char **end_ptr,
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                                        unsigned char **cached_data_ptr,
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                                        jint *cached_length_ptr);
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  static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN;
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  static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN;
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  static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
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  // used at a safepoint to post a CompiledMethodUnload event
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  static void post_compiled_method_unload_at_safepoint(jmethodID mid, const void *code_begin) KERNEL_RETURN;
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  // similiar to post_dynamic_code_generated except that it can be used to
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  // post a DynamicCodeGenerated event while holding locks in the VM. Any event
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  // posted using this function is recorded by the enclosing event collector
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  // -- JvmtiDynamicCodeEventCollector.
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  static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN;
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  static void post_garbage_collection_finish() KERNEL_RETURN;
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  static void post_garbage_collection_start() KERNEL_RETURN;
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  static void post_data_dump() KERNEL_RETURN;
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  static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
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  static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
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  static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN;
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  static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN;
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  static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN;
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  static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN;
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  static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN;
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  // Post objects collected by vm_object_alloc_event_collector.
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  static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN;
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  // Collects vm internal objects for later event posting.
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  inline static void vm_object_alloc_event_collector(oop object) {
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    if (should_post_vm_object_alloc()) {
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      record_vm_internal_object_allocation(object);
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    }
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  }
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  static void cleanup_thread             (JavaThread* thread) KERNEL_RETURN;
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  static void oops_do(OopClosure* f) KERNEL_RETURN;
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  static void transition_pending_onload_raw_monitors() KERNEL_RETURN;
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#ifndef SERVICES_KERNEL
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  // attach support
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  static jint load_agent_library(AttachOperation* op, outputStream* out);
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#endif // SERVICES_KERNEL
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  // SetNativeMethodPrefix support
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  static char** get_all_native_method_prefixes(int* count_ptr);
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  // call after CMS has completed referencing processing
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  static void cms_ref_processing_epilogue() KERNEL_RETURN;
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};
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// Support class used by JvmtiDynamicCodeEventCollector and others. It
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// describes a single code blob by name and address range.
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class JvmtiCodeBlobDesc : public CHeapObj {
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 private:
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  char _name[64];
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  address _code_begin;
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  address _code_end;
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 public:
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  JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
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    assert(name != NULL, "all code blobs must be named");
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    strncpy(_name, name, sizeof(_name));
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    _name[sizeof(_name)-1] = '\0';
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    _code_begin = code_begin;
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    _code_end = code_end;
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  }
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  char* name()                  { return _name; }
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  address code_begin()          { return _code_begin; }
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  address code_end()            { return _code_end; }
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};
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   368
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   369
// JvmtiEventCollector is a helper class to setup thread for
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   370
// event collection.
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   371
class JvmtiEventCollector : public StackObj {
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   372
 private:
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   373
  JvmtiEventCollector* _prev;  // Save previous one to support nested event collector.
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   374
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   375
 public:
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  void setup_jvmti_thread_state(); // Set this collector in current thread.
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   377
  void unset_jvmti_thread_state(); // Reset previous collector in current thread.
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   378
  virtual bool is_dynamic_code_event()   { return false; }
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   379
  virtual bool is_vm_object_alloc_event(){ return false; }
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   380
  JvmtiEventCollector *get_prev()        { return _prev; }
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   381
};
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   382
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   383
// A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
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   384
// interface. It collects "dynamic code generated" events that are posted
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   385
// while holding locks. When the event collector goes out of scope the
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   386
// events will be posted.
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   387
//
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   388
// Usage :-
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   389
//
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   390
// {
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//   JvmtiDynamicCodeEventCollector event_collector;
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   392
//   :
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   393
//   { MutexLocker ml(...)
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   394
//     :
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   395
//     JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
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   396
//   }
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   397
//   // event collector goes out of scope => post events to profiler.
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   398
// }
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   399
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   400
class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
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   401
 private:
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   402
  GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs;           // collected code blob events
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   403
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   404
  friend class JvmtiExport;
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   405
  void register_stub(const char* name, address start, address end);
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   406
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   407
 public:
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   408
  JvmtiDynamicCodeEventCollector()  KERNEL_RETURN;
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   409
  ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
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   410
  bool is_dynamic_code_event()   { return true; }
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   411
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   412
};
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   413
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   414
// Used to record vm internally allocated object oops and post
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   415
// vm object alloc event for objects visible to java world.
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   416
// Constructor enables JvmtiThreadState flag and all vm allocated
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   417
// objects are recorded in a growable array. When destructor is
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   418
// called the vm object alloc event is posted for each objects
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   419
// visible to java world.
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   420
// See jvm.cpp file for its usage.
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   421
//
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   422
class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector {
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   423
 private:
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   424
  GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop.
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   425
  bool _enable;                   // This flag is enabled in constructor and disabled
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   426
                                  // in destructor before posting event. To avoid
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   427
                                  // collection of objects allocated while running java code inside
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   428
                                  // agent post_vm_object_alloc() event handler.
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   429
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   430
  //GC support
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   431
  void oops_do(OopClosure* f);
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   432
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   433
  friend class JvmtiExport;
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   434
  // Record vm allocated object oop.
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parents:
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   435
  inline void record_allocation(oop obj);
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   436
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   437
  //GC support
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   438
  static void oops_do_for_all_threads(OopClosure* f);
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   439
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   440
 public:
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   441
  JvmtiVMObjectAllocEventCollector()  KERNEL_RETURN;
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   442
  ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
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   443
  bool is_vm_object_alloc_event()   { return true; }
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   444
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   445
  bool is_enabled()                 { return _enable; }
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   446
  void set_enabled(bool on)         { _enable = on; }
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   447
};
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   448
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   449
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   450
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   451
// Marker class to disable the posting of VMObjectAlloc events
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   452
// within its scope.
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   453
//
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   454
// Usage :-
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   455
//
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parents:
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   456
// {
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   457
//   NoJvmtiVMObjectAllocMark njm;
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   458
//   :
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diff changeset
   459
//   // VMObjAlloc event will not be posted
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diff changeset
   460
//   JvmtiExport::vm_object_alloc_event_collector(obj);
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   461
//   :
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   462
// }
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diff changeset
   463
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   464
class NoJvmtiVMObjectAllocMark : public StackObj {
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   465
 private:
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   466
  // enclosing collector if enabled, NULL otherwise
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   467
  JvmtiVMObjectAllocEventCollector *_collector;
489c9b5090e2 Initial load
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diff changeset
   468
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   469
  bool was_enabled()    { return _collector != NULL; }
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   470
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diff changeset
   471
 public:
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   472
  NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
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diff changeset
   473
  ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
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diff changeset
   474
};
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   475
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diff changeset
   476
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parents:
diff changeset
   477
// Base class for reporting GC events to JVMTI.
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   478
class JvmtiGCMarker : public StackObj {
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parents:
diff changeset
   479
 private:
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diff changeset
   480
  bool _full;                           // marks a "full" GC
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parents:
diff changeset
   481
  unsigned int _invocation_count;       // GC invocation count
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diff changeset
   482
 protected:
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parents:
diff changeset
   483
  JvmtiGCMarker(bool full) KERNEL_RETURN;       // protected
489c9b5090e2 Initial load
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parents:
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   484
  ~JvmtiGCMarker() KERNEL_RETURN;               // protected
489c9b5090e2 Initial load
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parents:
diff changeset
   485
};
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parents:
diff changeset
   486
489c9b5090e2 Initial load
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parents:
diff changeset
   487
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parents:
diff changeset
   488
// Support class used to report GC events to JVMTI. The class is stack
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parents:
diff changeset
   489
// allocated and should be placed in the doit() implementation of all
489c9b5090e2 Initial load
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parents:
diff changeset
   490
// vm operations that do a stop-the-world GC for failed allocation.
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parents:
diff changeset
   491
//
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parents:
diff changeset
   492
// Usage :-
489c9b5090e2 Initial load
duke
parents:
diff changeset
   493
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   494
// void VM_GenCollectForAllocation::doit() {
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parents:
diff changeset
   495
//   JvmtiGCForAllocationMarker jgcm;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   496
//   :
489c9b5090e2 Initial load
duke
parents:
diff changeset
   497
// }
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parents:
diff changeset
   498
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   499
// If jvmti is not enabled the constructor and destructor is essentially
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parents:
diff changeset
   500
// a no-op (no overhead).
489c9b5090e2 Initial load
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parents:
diff changeset
   501
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   502
class JvmtiGCForAllocationMarker : public JvmtiGCMarker {
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duke
parents:
diff changeset
   503
 public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   504
  JvmtiGCForAllocationMarker() : JvmtiGCMarker(false) {
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duke
parents:
diff changeset
   505
  }
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parents:
diff changeset
   506
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   507
489c9b5090e2 Initial load
duke
parents:
diff changeset
   508
// Support class used to report GC events to JVMTI. The class is stack
489c9b5090e2 Initial load
duke
parents:
diff changeset
   509
// allocated and should be placed in the doit() implementation of all
489c9b5090e2 Initial load
duke
parents:
diff changeset
   510
// vm operations that do a "full" stop-the-world GC. This class differs
489c9b5090e2 Initial load
duke
parents:
diff changeset
   511
// from JvmtiGCForAllocationMarker in that this class assumes that a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   512
// "full" GC will happen.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   513
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   514
// Usage :-
489c9b5090e2 Initial load
duke
parents:
diff changeset
   515
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   516
// void VM_GenCollectFull::doit() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   517
//   JvmtiGCFullMarker jgcm;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   518
//   :
489c9b5090e2 Initial load
duke
parents:
diff changeset
   519
// }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   520
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   521
class JvmtiGCFullMarker : public JvmtiGCMarker {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   522
 public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   523
  JvmtiGCFullMarker() : JvmtiGCMarker(true) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   524
  }
489c9b5090e2 Initial load
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parents:
diff changeset
   525
};
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parents:
diff changeset
   526
489c9b5090e2 Initial load
duke
parents:
diff changeset
   527
489c9b5090e2 Initial load
duke
parents:
diff changeset
   528
// JvmtiHideSingleStepping is a helper class for hiding
489c9b5090e2 Initial load
duke
parents:
diff changeset
   529
// internal single step events.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   530
class JvmtiHideSingleStepping : public StackObj {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   531
 private:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   532
  bool         _single_step_hidden;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   533
  JavaThread * _thread;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   534
489c9b5090e2 Initial load
duke
parents:
diff changeset
   535
 public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   536
  JvmtiHideSingleStepping(JavaThread * thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   537
    assert(thread != NULL, "sanity check");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   538
489c9b5090e2 Initial load
duke
parents:
diff changeset
   539
    _single_step_hidden = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   540
    _thread = thread;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   541
    if (JvmtiExport::should_post_single_step()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   542
      _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   543
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   544
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   545
489c9b5090e2 Initial load
duke
parents:
diff changeset
   546
  ~JvmtiHideSingleStepping() {
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duke
parents:
diff changeset
   547
    if (_single_step_hidden) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   548
      JvmtiExport::expose_single_stepping(_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   549
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   550
  }
489c9b5090e2 Initial load
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parents:
diff changeset
   551
};
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parents:
diff changeset
   552
489c9b5090e2 Initial load
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parents:
diff changeset
   553
#endif   /* _JAVA_JVMTIEXPORT_H_ */