jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiImpl.hpp@fa83ab460c54 (annotated)

src/share/vm/prims/jvmtiImpl.hpp@fa83ab460c54 (annotated)

src/share/vm/prims/jvmtiImpl.hpp

Fri, 22 Oct 2010 15:59:34 -0400

author: acorn
date: Fri, 22 Oct 2010 15:59:34 -0400
changeset 2233: fa83ab460c54
parent 1907: c18cbe5936b8
child 2314: f95d63e2154a
permissions: -rw-r--r--

6988353: refactor contended sync subsystem
Summary: reduce complexity by factoring synchronizer.cpp
Reviewed-by: dholmes, never, coleenp

 /*
  * 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
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 //
 // Forward Declarations
 //
 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;
 }
 ///////////////////////////////////////////////////////////////
 // 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); }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jvmtiImpl.hpp@fa83ab460c54 (annotated)

src/share/vm/prims/jvmtiImpl.hpp