view src/share/vm/runtime/vframe_hp.hpp @ 900:9987d9d5eb0e

6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot Summary: developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens Reviewed-by: kvn, never, jrose, twisti
author cfang
date Fri, 31 Jul 2009 17:12:33 -0700
parents a61af66fc99e
children 89e0543e1737
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/*
 * Copyright 1997-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

class compiledVFrame: public javaVFrame {
 public:
  // JVM state
  methodOop                    method()             const;
  int                          bci()                const;
  bool                         should_reexecute()   const;
  StackValueCollection*        locals()             const;
  StackValueCollection*        expressions()        const;
  GrowableArray<MonitorInfo*>* monitors()           const;

  void set_locals(StackValueCollection* values) const;

  // Virtuals defined in vframe
  bool is_compiled_frame() const { return true; }
  vframe* sender() const;
  bool is_top() const;

  // Casting
  static compiledVFrame* cast(vframe* vf) {
    assert(vf == NULL || vf->is_compiled_frame(), "must be compiled frame");
    return (compiledVFrame*) vf;
  }

 public:
  // Constructors
  compiledVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread, nmethod* nm);

  // Update a local in a compiled frame. Update happens when deopt occurs
  void update_local(BasicType type, int index, jvalue value);

  // Returns the active nmethod
  nmethod*  code() const;

  // Returns the scopeDesc
  ScopeDesc* scope() const { return _scope; }

  // Returns SynchronizationEntryBCI or bci() (used for synchronization)
  int raw_bci() const;

 protected:
  ScopeDesc* _scope;


  //StackValue resolve(ScopeValue* sv) const;
  BasicLock* resolve_monitor_lock(Location location) const;
  StackValue *create_stack_value(ScopeValue *sv) const;

 private:
  compiledVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread, ScopeDesc* scope);

#ifndef PRODUCT
 public:
  void verify() const;
#endif
};

// In order to implement set_locals for compiled vframes we must
// store updated locals in a data structure that contains enough
// information to recognize equality with a vframe and to store
// any updated locals.

class jvmtiDeferredLocalVariable;
class jvmtiDeferredLocalVariableSet : public CHeapObj {
private:

  methodOop _method;           // must be GC'd
  int       _bci;
  intptr_t* _id;
  GrowableArray<jvmtiDeferredLocalVariable*>* _locals;

 public:
  // JVM state
  methodOop                         method()         const  { return _method; }
  int                               bci()            const  { return _bci; }
  intptr_t*                         id()             const  { return _id; }
  GrowableArray<jvmtiDeferredLocalVariable*>* locals()         const  { return _locals; }
  void                              set_local_at(int idx, BasicType typ, jvalue val);

  // Does the vframe match this jvmtiDeferredLocalVariableSet
  bool                              matches(vframe* vf);
  // GC
  void                              oops_do(OopClosure* f);

  // constructor
  jvmtiDeferredLocalVariableSet(methodOop method, int bci, intptr_t* id);

  // destructor
  ~jvmtiDeferredLocalVariableSet();


};

class jvmtiDeferredLocalVariable : public CHeapObj {
  public:

    jvmtiDeferredLocalVariable(int index, BasicType type, jvalue value);

    BasicType type(void)                   { return _type; }
    int index(void)                        { return _index; }
    jvalue value(void)                     { return _value; }
    // Only mutator is for value as only it can change
    void set_value(jvalue value)           { _value = value; }
    // For gc
    oop* oop_addr(void)                    { return (oop*) &_value.l; }

  private:

    BasicType         _type;
    jvalue            _value;
    int               _index;

};