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 /*

  * Copyright (c) 1999, 2007, 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

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 //

 // Forward Declarations

 //

 class JvmtiRawMonitor;

 class JvmtiBreakpoint;

 class JvmtiBreakpoints;

 ///////////////////////////////////////////////////////////////

 //

 // class GrowableCache, GrowableElement

 // Used by              : JvmtiBreakpointCache

 // Used by JVMTI methods: none directly.

 //

 // GrowableCache is a permanent CHeap growable array of <GrowableElement *>

 //

 // In addition, the GrowableCache maintains a NULL terminated cache array of type address

 // that's created from the element array using the function:

 //     address GrowableElement::getCacheValue().

 //

 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated

 // block of memory. Additionally, every time the cache changes its position in memory, the

 //    void (*_listener_fun)(void *this_obj, address* cache)

 // gets called with the cache's new address. This gives the user of the GrowableCache a callback

 // to update its pointer to the address cache.

 //

 class GrowableElement : public CHeapObj {

 public:

   virtual address getCacheValue()          =0;

   virtual bool equals(GrowableElement* e)  =0;

   virtual bool lessThan(GrowableElement *e)=0;

   virtual GrowableElement *clone()         =0;

   virtual void oops_do(OopClosure* f)      =0;

 };

 class GrowableCache VALUE_OBJ_CLASS_SPEC {

 private:

   // Object pointer passed into cache & listener functions.

   void *_this_obj;

   // Array of elements in the collection

   GrowableArray<GrowableElement *> *_elements;

   // Parallel array of cached values

   address *_cache;

   // Listener for changes to the _cache field.

   // Called whenever the _cache field has it's value changed

   // (but NOT when cached elements are recomputed).

   void (*_listener_fun)(void *, address*);

   static bool equals(void *, GrowableElement *);

   // recache all elements after size change, notify listener

   void recache();

 public:

    GrowableCache();

    ~GrowableCache();

   void initialize(void *this_obj, void listener_fun(void *, address*) );

   // number of elements in the collection

   int length();

   // get the value of the index element in the collection

   GrowableElement* at(int index);

   // find the index of the element, -1 if it doesn't exist

   int find(GrowableElement* e);

   // append a copy of the element to the end of the collection, notify listener

   void append(GrowableElement* e);

   // insert a copy of the element using lessthan(), notify listener

   void insert(GrowableElement* e);

   // remove the element at index, notify listener

   void remove (int index);

   // clear out all elements and release all heap space, notify listener

   void clear();

   // apply f to every element and update the cache

   void oops_do(OopClosure* f);

   void gc_epilogue();

 };

 ///////////////////////////////////////////////////////////////

 //

 // class JvmtiBreakpointCache

 // Used by              : JvmtiBreakpoints

 // Used by JVMTI methods: none directly.

 // Note   : typesafe wrapper for GrowableCache of JvmtiBreakpoint

 //

 class JvmtiBreakpointCache : public CHeapObj {

 private:

   GrowableCache _cache;

 public:

   JvmtiBreakpointCache()  {}

   ~JvmtiBreakpointCache() {}

   void initialize(void *this_obj, void listener_fun(void *, address*) ) {

     _cache.initialize(this_obj,listener_fun);

   }

   int length()                          { return _cache.length(); }

   JvmtiBreakpoint& at(int index)        { return (JvmtiBreakpoint&) *(_cache.at(index)); }

   int find(JvmtiBreakpoint& e)          { return _cache.find((GrowableElement *) &e); }

   void append(JvmtiBreakpoint& e)       { _cache.append((GrowableElement *) &e); }

   void remove (int index)               { _cache.remove(index); }

   void clear()                          { _cache.clear(); }

   void oops_do(OopClosure* f)           { _cache.oops_do(f); }

   void gc_epilogue()                    { _cache.gc_epilogue(); }

 };

 ///////////////////////////////////////////////////////////////

 //

 // class JvmtiBreakpoint

 // Used by              : JvmtiBreakpoints

 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints

 // Note: Extends GrowableElement for use in a GrowableCache

 //

 // A JvmtiBreakpoint describes a location (class, method, bci) to break at.

 //

 typedef void (methodOopDesc::*method_action)(int _bci);

 class JvmtiBreakpoint : public GrowableElement {

 private:

   methodOop             _method;

   int                   _bci;

   Bytecodes::Code       _orig_bytecode;

 public:

   JvmtiBreakpoint();

   JvmtiBreakpoint(methodOop m_method, jlocation location);

   bool equals(JvmtiBreakpoint& bp);

   bool lessThan(JvmtiBreakpoint &bp);

   void copy(JvmtiBreakpoint& bp);

   bool is_valid();

   address getBcp();

   void each_method_version_do(method_action meth_act);

   void set();

   void clear();

   void print();

   methodOop method() { return _method; }

   // GrowableElement implementation

   address getCacheValue()         { return getBcp(); }

   bool lessThan(GrowableElement* e) { Unimplemented(); return false; }

   bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); }

   void oops_do(OopClosure* f)     { f->do_oop((oop *) &_method); }

   GrowableElement *clone()        {

     JvmtiBreakpoint *bp = new JvmtiBreakpoint();

     bp->copy(*this);

     return bp;

   }

 };

 ///////////////////////////////////////////////////////////////

 //

 // class VM_ChangeBreakpoints

 // Used by              : JvmtiBreakpoints

 // Used by JVMTI methods: none directly.

 // Note: A Helper class.

 //

 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class.

 //

 class VM_ChangeBreakpoints : public VM_Operation {

 private:

   JvmtiBreakpoints* _breakpoints;

   int               _operation;

   JvmtiBreakpoint*  _bp;

 public:

   enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 };

   VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) {

     _breakpoints = breakpoints;

     _bp = NULL;

     _operation = operation;

     assert(breakpoints != NULL, "breakpoints != NULL");

     assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation");

   }

   VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) {

     _breakpoints = breakpoints;

     _bp = bp;

     _operation = operation;

     assert(breakpoints != NULL, "breakpoints != NULL");

     assert(bp != NULL, "bp != NULL");

     assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation");

   }

   VMOp_Type type() const { return VMOp_ChangeBreakpoints; }

   void doit();

   void oops_do(OopClosure* f);

 };

 ///////////////////////////////////////////////////////////////

 //

 // class JvmtiBreakpoints

 // Used by              : JvmtiCurrentBreakpoints

 // Used by JVMTI methods: none directly

 // Note: A Helper class

 //

 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint.

 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints.

 //

 // Because _bps is only modified at safepoints, its possible to always use the

 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints).

 //

 // It would be possible to make JvmtiBreakpoints a static class, but I've made it

 // CHeap allocated to emphasize its similarity to JvmtiFramePops.

 //

 class JvmtiBreakpoints : public CHeapObj {

 private:

   JvmtiBreakpointCache _bps;

   // These should only be used by VM_ChangeBreakpoints

   // to insure they only occur at safepoints.

   // Todo: add checks for safepoint

   friend class VM_ChangeBreakpoints;

   void set_at_safepoint(JvmtiBreakpoint& bp);

   void clear_at_safepoint(JvmtiBreakpoint& bp);

   void clearall_at_safepoint();

   static void do_element(GrowableElement *e);

 public:

   JvmtiBreakpoints(void listener_fun(void *, address *));

   ~JvmtiBreakpoints();

   int length();

   void oops_do(OopClosure* f);

   void gc_epilogue();

   void print();

   int  set(JvmtiBreakpoint& bp);

   int  clear(JvmtiBreakpoint& bp);

   void clearall_in_class_at_safepoint(klassOop klass);

   void clearall();

 };

 ///////////////////////////////////////////////////////////////

 //

 // class JvmtiCurrentBreakpoints

 //

 // A static wrapper class for the JvmtiBreakpoints that provides:

 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint).

 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary,

 //    but I'm copying the code from JvmtiThreadState which needs to lazily initialize

 //    JvmtiFramePops).

 // 3. An oops_do entry point for GC'ing the breakpoint array.

 //

 class JvmtiCurrentBreakpoints : public AllStatic {

 private:

   // Current breakpoints, lazily initialized by get_jvmti_breakpoints();

   static JvmtiBreakpoints *_jvmti_breakpoints;

   // NULL terminated cache of byte-code pointers corresponding to current breakpoints.

   // Updated only at safepoints (with listener_fun) when the cache is moved.

   // It exists only to make is_breakpoint fast.

   static address          *_breakpoint_list;

   static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; }

   static inline address *get_breakpoint_list()                     { return _breakpoint_list; }

   // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list.

   static void listener_fun(void *this_obj, address *cache);

 public:

   static void initialize();

   static void destroy();

   // lazily create _jvmti_breakpoints and _breakpoint_list

   static JvmtiBreakpoints& get_jvmti_breakpoints();

   // quickly test whether the bcp matches a cached breakpoint in the list

   static inline bool is_breakpoint(address bcp);

   static void oops_do(OopClosure* f);

   static void gc_epilogue();

 };

 // quickly test whether the bcp matches a cached breakpoint in the list

 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) {

     address *bps = get_breakpoint_list();

     if (bps == NULL) return false;

     for ( ; (*bps) != NULL; bps++) {

       if ((*bps) == bcp) return true;

     }

     return false;

 }

 ///////////////////////////////////////////////////////////////

 //

 // class JvmtiRawMonitor

 //

 // Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.)

 //

 // Wrapper for ObjectMonitor class that saves the Monitor's name

 //

 class JvmtiRawMonitor : public ObjectMonitor  {

 private:

   int           _magic;

   char *        _name;

   // JVMTI_RM_MAGIC is set in contructor and unset in destructor.

   enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') };

 public:

   JvmtiRawMonitor(const char *name);

   ~JvmtiRawMonitor();

   int            magic()   { return _magic;  }

   const char *get_name()   { return _name; }

   bool        is_valid();

 };

 // Onload pending raw monitors

 // Class is used to cache onload or onstart monitor enter

 // which will transition into real monitor when

 // VM is fully initialized.

 class JvmtiPendingMonitors : public AllStatic {

 private:

   static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter

   inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; }

   static void dispose() {

     delete monitors();

   }

 public:

   static void enter(JvmtiRawMonitor *monitor) {

     monitors()->append(monitor);

   }

   static int count() {

     return monitors()->length();

   }

   static void destroy(JvmtiRawMonitor *monitor) {

     while (monitors()->contains(monitor)) {

       monitors()->remove(monitor);

     }

   }

   // Return false if monitor is not found in the list.

   static bool exit(JvmtiRawMonitor *monitor) {

     if (monitors()->contains(monitor)) {

       monitors()->remove(monitor);

       return true;

     } else {

       return false;

     }

   }

   static void transition_raw_monitors();

 };

 ///////////////////////////////////////////////////////////////

 // The get/set local operations must only be done by the VM thread

 // because the interpreter version needs to access oop maps, which can

 // only safely be done by the VM thread

 //

 // I'm told that in 1.5 oop maps are now protected by a lock and

 // we could get rid of the VM op

 // However if the VM op is removed then the target thread must

 // be suspended AND a lock will be needed to prevent concurrent

 // setting of locals to the same java thread. This lock is needed

 // to prevent compiledVFrames from trying to add deferred updates

 // to the thread simultaneously.

 //

 class VM_GetOrSetLocal : public VM_Operation {

 private:

   JavaThread* _thread;

   JavaThread* _calling_thread;

   jint        _depth;

   jint        _index;

   BasicType   _type;

   jvalue      _value;

   javaVFrame* _jvf;

   bool        _set;

   jvmtiError  _result;

   vframe* get_vframe();

   javaVFrame* get_java_vframe();

   bool check_slot_type(javaVFrame* vf);

 public:

   // Constructor for non-object getter

   VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type);

   // Constructor for object or non-object setter

   VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value);

   // Constructor for object getter

   VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth,

                    int index);

   VMOp_Type type() const { return VMOp_GetOrSetLocal; }

   jvalue value()         { return _value; }

   jvmtiError result()    { return _result; }

   bool doit_prologue();

   void doit();

   bool allow_nested_vm_operations() const;

   const char* name() const                       { return "get/set locals"; }

   // Check that the klass is assignable to a type with the given signature.

   static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread);

 };

 ///////////////////////////////////////////////////////////////

 //

 // class JvmtiSuspendControl

 //

 // Convenience routines for suspending and resuming threads.

 //

 // All attempts by JVMTI to suspend and resume threads must go through the

 // JvmtiSuspendControl interface.

 //

 // methods return true if successful

 //

 class JvmtiSuspendControl : public AllStatic {

 public:

   // suspend the thread, taking it to a safepoint

   static bool suspend(JavaThread *java_thread);

   // resume the thread

   static bool resume(JavaThread *java_thread);

   static void print();

 };

 // Utility macro that checks for NULL pointers:

 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); }