1 /*

     2  * Copyright (c) 2015, 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  */

    24 

    25 

    26 #ifndef SHARE_VM_PRIMS_STACKWALK_HPP

    27 #define SHARE_VM_PRIMS_STACKWALK_HPP

    28 

    29 #include "oops/oop.hpp"

    30 #include "runtime/vframe.hpp"

    31 

    32 class StackWalkAnchor : public StackObj {

    33 private:

    34   enum {

    35     magic_pos = 0

    36   };

    37 

    38   JavaThread*           _thread;

    39   vframeStream          _vfst;

    40   jlong                 _anchor;

    41 public:

    42   StackWalkAnchor(JavaThread* thread)

    43     : _thread(thread), _vfst(thread), _anchor(0L) {}

    44 

    45   vframeStream&   vframe_stream()         { return _vfst; }

    46   JavaThread*     thread()                { return _thread; }

    47 

    48   void setup_magic_on_entry(objArrayHandle classes_array);

    49   bool check_magic(objArrayHandle classes_array);

    50   bool cleanup_magic_on_exit(objArrayHandle classes_array);

    51 

    52   bool is_valid_in(Thread* thread, objArrayHandle classes_array) {

    53     return (_thread == thread && check_magic(classes_array));

    54   }

    55 

    56   jlong address_value() {

    57     return (jlong) castable_address(this);

    58   }

    59 

    60   static StackWalkAnchor* from_current(JavaThread* thread, jlong anchor, objArrayHandle frames_array);

    61 };

    62 

    63 class StackWalk : public AllStatic {

    64 private:

    65   static int fill_in_frames(jlong mode, vframeStream& vfst,

    66                             int max_nframes, int start_index,

    67                             objArrayHandle classes_array,

    68                             objArrayHandle frames_array,

    69                             int& end_index, TRAPS);

    70 

    71   static void fill_stackframe(Handle stackFrame, const methodHandle& method, int bci);

    72 

    73   static void fill_live_stackframe(Handle stackFrame, const methodHandle& method, int bci,

    74                                    javaVFrame* jvf, TRAPS);

    75 

    76   static inline bool skip_hidden_frames(int mode) {

    77     return (mode & JVM_STACKWALK_SHOW_HIDDEN_FRAMES) == 0;

    78   }

    79   static inline bool need_method_info(int mode) {

    80     return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;

    81   }

    82   static inline bool live_frame_info(int mode) {

    83     return (mode & JVM_STACKWALK_FILL_LIVE_STACK_FRAMES) != 0;

    84   }

    85   static inline bool fill_in_stacktrace(int mode) {

    86     return (mode & JVM_STACKWALK_FILTER_FILL_IN_STACK_TRACE) != 0;

    87   }

    88 

    89 public:

    90   static oop walk(Handle stackStream, jlong mode,

    91                   int skip_frames, int frame_count, int start_index,

    92                   objArrayHandle classes_array,

    93                   objArrayHandle frames_array,

    94                   TRAPS);

    95 

    96   static jint moreFrames(Handle stackStream, jlong mode, jlong magic,

    97                          int frame_count, int start_index,

    98                          objArrayHandle classes_array,

    99                          objArrayHandle frames_array,

   100                          TRAPS);

   101 };

   102 #endif // SHARE_VM_PRIMS_STACKWALK_HPP