1 /*

     2  * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.

     3  * Copyright 2008, 2009 Red Hat, Inc.

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

     5  *

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

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

     8  * published by the Free Software Foundation.

     9  *

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

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

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

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

    14  * accompanied this code).

    15  *

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

    17  * 2 along with this work; if not, write to the Free Software Foundation,

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

    19  *

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

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

    22  * questions.

    23  *

    24  */

    25 

    26 class SharkState;

    27 

    28 class SharkStateScanner : public SharkTargetInvariants {

    29  protected:

    30   SharkStateScanner(SharkFunction* function)

    31     : SharkTargetInvariants(function), _stack(function->stack()) {}

    32 

    33  private:

    34   SharkStack* _stack;

    35 

    36  protected:

    37   SharkStack* stack() const {

    38     return _stack;

    39   }

    40 

    41   // Scan the frame

    42  public:

    43   void scan(SharkState* state);

    44 

    45   // Callbacks

    46   // Note that the offsets supplied to the various process_* callbacks

    47   // are specified in wordSize words from the frame's unextended_sp.

    48  protected:

    49   virtual void start_frame()                                                 {}

    50 

    51   virtual void start_stack(int stack_depth)                                  {}

    52   virtual void process_stack_slot(int index, SharkValue** value, int offset) {}

    53   virtual void end_stack()                                                   {}

    54 

    55   virtual void start_monitors(int num_monitors)                              {}

    56   virtual void process_monitor(int index, int box_offset, int obj_offset)    {}

    57   virtual void end_monitors()                                                {}

    58 

    59   virtual void start_frame_header()                                          {}

    60   virtual void process_oop_tmp_slot(llvm::Value** value, int offset)         {}

    61   virtual void process_method_slot(llvm::Value** value, int offset)          {}

    62   virtual void process_pc_slot(int offset)                                   {}

    63   virtual void end_frame_header()                                            {}

    64 

    65   virtual void start_locals()                                                {}

    66   virtual void process_local_slot(int index, SharkValue** value, int offset) {}

    67   virtual void end_locals()                                                  {}

    68 

    69   virtual void end_frame()                                                   {}

    70 

    71   // Integrity checks

    72  private:

    73   void stack_integrity_checks(SharkState* state) PRODUCT_RETURN;

    74   void locals_integrity_checks(SharkState* state) PRODUCT_RETURN;

    75 };