jdk8-mips64-public/hotspot: src/share/vm/runtime/vframe

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

     1 /*

     2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_RUNTIME_VFRAME_HP_HPP

    26 #define SHARE_VM_RUNTIME_VFRAME_HP_HPP

    28 #include "runtime/vframe.hpp"

    30 class compiledVFrame: public javaVFrame {

    31  public:

    32   // JVM state

    33   Method*                      method()             const;

    34   int                          bci()                const;

    35   bool                         should_reexecute()   const;

    36   StackValueCollection*        locals()             const;

    37   StackValueCollection*        expressions()        const;

    38   GrowableArray<MonitorInfo*>* monitors()           const;

    40   void set_locals(StackValueCollection* values) const;

    42   // Virtuals defined in vframe

    43   bool is_compiled_frame() const { return true; }

    44   vframe* sender() const;

    45   bool is_top() const;

    47   // Casting

    48   static compiledVFrame* cast(vframe* vf) {

    49     assert(vf == NULL || vf->is_compiled_frame(), "must be compiled frame");

    50     return (compiledVFrame*) vf;

    51   }

    53  public:

    54   // Constructors

    55   compiledVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread, nmethod* nm);

    57   // Update a local in a compiled frame. Update happens when deopt occurs

    58   void update_local(BasicType type, int index, jvalue value);

    60   // Returns the active nmethod

    61   nmethod*  code() const;

    63   // Returns the scopeDesc

    64   ScopeDesc* scope() const { return _scope; }

    66   // Returns SynchronizationEntryBCI or bci() (used for synchronization)

    67   int raw_bci() const;

    69  protected:

    70   ScopeDesc* _scope;

    73   //StackValue resolve(ScopeValue* sv) const;

    74   BasicLock* resolve_monitor_lock(Location location) const;

    75   StackValue *create_stack_value(ScopeValue *sv) const;

    77  private:

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

    80 #ifndef PRODUCT

    81  public:

    82   void verify() const;

    83 #endif

    84 };

    86 // In order to implement set_locals for compiled vframes we must

    87 // store updated locals in a data structure that contains enough

    88 // information to recognize equality with a vframe and to store

    89 // any updated locals.

    91 class jvmtiDeferredLocalVariable;

    92 class jvmtiDeferredLocalVariableSet : public CHeapObj<mtCompiler> {

    93 private:

    95   Method* _method;

    96   int       _bci;

    97   intptr_t* _id;

    98   GrowableArray<jvmtiDeferredLocalVariable*>* _locals;

   100  public:

   101   // JVM state

   102   Method*                           method()         const  { return _method; }

   103   int                               bci()            const  { return _bci; }

   104   intptr_t*                         id()             const  { return _id; }

   105   GrowableArray<jvmtiDeferredLocalVariable*>* locals()         const  { return _locals; }

   106   void                              set_local_at(int idx, BasicType typ, jvalue val);

   108   // Does the vframe match this jvmtiDeferredLocalVariableSet

   109   bool                              matches(vframe* vf);

   110   // GC

   111   void                              oops_do(OopClosure* f);

   113   // constructor

   114   jvmtiDeferredLocalVariableSet(Method* method, int bci, intptr_t* id);

   116   // destructor

   117   ~jvmtiDeferredLocalVariableSet();

   120 };

   122 class jvmtiDeferredLocalVariable : public CHeapObj<mtCompiler> {

   123   public:

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

   127     BasicType type(void)                   { return _type; }

   128     int index(void)                        { return _index; }

   129     jvalue value(void)                     { return _value; }

   130     // Only mutator is for value as only it can change

   131     void set_value(jvalue value)           { _value = value; }

   132     // For gc

   133     oop* oop_addr(void)                    { return (oop*) &_value.l; }

   135   private:

   137     BasicType         _type;

   138     jvalue            _value;

   139     int               _index;

   141 };

   143 #endif // SHARE_VM_RUNTIME_VFRAME_HP_HPP

src/share/vm/runtime/vframe_hp.hpp@595c0f60d50d