jdk8-mips64-public/hotspot: src/share/vm/code/scopeDesc.hpp@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

     1 /*

     2  * Copyright 1997-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // SimpleScopeDesc is used when all you need to extract from

    26 // a given pc,nmethod pair is a methodOop and a bci. This is

    27 // quite a bit faster than allocating a full ScopeDesc, but

    28 // very limited in abilities.

    30 class SimpleScopeDesc : public StackObj {

    31  private:

    32   methodOop _method;

    33   int _bci;

    35  public:

    36   SimpleScopeDesc(nmethod* code,address pc) {

    37     PcDesc* pc_desc = code->pc_desc_at(pc);

    38     assert(pc_desc != NULL, "Must be able to find matching PcDesc");

    39     DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());

    40     int ignore_sender = buffer.read_int();

    41     _method           = methodOop(buffer.read_oop());

    42     bool dummy_reexecute; //only methodOop and bci are needed!

    43     _bci              = buffer.read_bci_and_reexecute(dummy_reexecute);

    44   }

    46   methodOop method() { return _method; }

    47   int bci() { return _bci; }

    48 };

    50 // ScopeDescs contain the information that makes source-level debugging of

    51 // nmethods possible; each scopeDesc describes a method activation

    53 class ScopeDesc : public ResourceObj {

    54  public:

    55   // Constructor

    56   ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset);

    58   // Calls above, giving default value of "serialized_null" to the

    59   // "obj_decode_offset" argument.  (We don't use a default argument to

    60   // avoid a .hpp-.hpp dependency.)

    61   ScopeDesc(const nmethod* code, int decode_offset);

    63   // JVM state

    64   methodHandle method()   const { return _method; }

    65   int          bci()      const { return _bci;    }

    66   bool should_reexecute() const { return _reexecute; }

    68   GrowableArray<ScopeValue*>*   locals();

    69   GrowableArray<ScopeValue*>*   expressions();

    70   GrowableArray<MonitorValue*>* monitors();

    71   GrowableArray<ScopeValue*>*   objects();

    73   // Stack walking, returns NULL if this is the outer most scope.

    74   ScopeDesc* sender() const;

    76   // Returns where the scope was decoded

    77   int decode_offset() const { return _decode_offset; }

    79   // Tells whether sender() returns NULL

    80   bool is_top() const;

    81   // Tells whether sd is equal to this

    82   bool is_equal(ScopeDesc* sd) const;

    84  private:

    85   // Alternative constructor

    86   ScopeDesc(const ScopeDesc* parent);

    88   // JVM state

    89   methodHandle  _method;

    90   int           _bci;

    91   bool          _reexecute;

    93   // Decoding offsets

    94   int _decode_offset;

    95   int _sender_decode_offset;

    96   int _locals_decode_offset;

    97   int _expressions_decode_offset;

    98   int _monitors_decode_offset;

   100   // Object pool

   101   GrowableArray<ScopeValue*>* _objects;

   103   // Nmethod information

   104   const nmethod* _code;

   106   // Decoding operations

   107   void decode_body();

   108   GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);

   109   GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);

   110   GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);

   112   DebugInfoReadStream* stream_at(int decode_offset) const;

   115  public:

   116   // Verification

   117   void verify();

   119 #ifndef PRODUCT

   120  public:

   121   // Printing support

   122   void print_on(outputStream* st) const;

   123   void print_on(outputStream* st, PcDesc* pd) const;

   124   void print_value_on(outputStream* st) const;

   125 #endif

   126 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/code/scopeDesc.hpp@9987d9d5eb0e

src/share/vm/code/scopeDesc.hpp