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 JavaThread* _thread;
34 objArrayHandle _frames;
35 vframeStream _vfst;
36 jlong _anchor;
37 address _last_decoded_frame_pc;
38 public:
39 StackWalkAnchor(JavaThread* thread, objArrayHandle frames_array)
40 : _thread(thread), _frames(frames_array), _vfst(thread), _anchor(0L), _last_decoded_frame_pc(0L)
41 {
42 }
43
44 vframeStream& vframe_stream() { return _vfst; }
45 JavaThread* thread() { return _thread; }
46 objArrayHandle frames() { return _frames; }
47 address last_decoded_frame_pc() { return _last_decoded_frame_pc; }
48
49 void setup_magic_on_entry();
50 bool check_magic();
51 bool cleanup_magic_on_exit();
52
53 bool is_valid_in(Thread* thread) {
54 return (_thread == thread && check_magic());
55 }
56
57 jlong address_value() {
58 return (jlong) castable_address(this);
59 }
60
61 int decode_frames(jlong mode, int decode_limit, int start_index,
62 objArrayHandle classes_array,
63 objArrayHandle frames_array,
64 int& end_index, TRAPS);
65 static StackWalkAnchor* from_current(JavaThread* thread, jlong anchor, objArrayHandle frames_array);
66 };
67
68 class StackWalk : public AllStatic {
69 public:
70 enum {
71 magic_pos = 0,
72 fill_class_refs_only = 0x2,
73 fill_method_name = 0x4,
74 fill_frame_buffer_only = 0x8,
75 filter_fillInStackTrace = 0x10,
76 show_hidden_frames = 0x20,
77 fill_locals_operands = 0x100
78 };
79 private:
80 static Klass* _stackWalker_klass;
81 static Klass* _abstractStackWalker_klass;
82
83 static Klass* StackWalker_klass(TRAPS);
84
85 // After this many redefines, the stack trace is unreliable.
86 public:
87 static Handle walk(Handle stackStream, jlong mode,
88 int skip_frames, int frame_count, int start_index,
89 objArrayHandle classes_array,
90 objArrayHandle frames_array,
91 TRAPS);
92
93 static jint moreFrames(Handle stackStream, jlong mode, jlong magic,
94 int frame_count, int start_index,
95 objArrayHandle classes_array,
96 objArrayHandle frames_array,
97 TRAPS);
98
99 static void fill_frame_buffer(methodHandle method, int bci, Handle stackFrame);
100
101 static void fill_live_stackframe(methodHandle method, int bci,
102 Handle stackFrame, javaVFrame* jvf, TRAPS);
103
104 static Klass* AbstractStackWalker_klass(TRAPS);
105
106 static inline bool skip_hidden_frames(int mode) { return (mode & show_hidden_frames) == 0; }
107 static inline bool need_method_info(int mode) { return (mode & fill_class_refs_only) == 0; }
108 static inline bool live_frame_info(int mode) { return (mode & fill_locals_operands) != 0; }
109 static inline bool fill_in_stacktrace(int mode) { return (mode & filter_fillInStackTrace) != 0; }
110
111 };
112 #endif // SHARE_VM_PRIMS_STACKWALK_HPP