Mercurial > hg > truffle
comparison src/share/vm/utilities/nativeCallStack.hpp @ 20360:833b0f92429a
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
author | zgu |
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date | Wed, 27 Aug 2014 08:19:12 -0400 |
parents | |
children | c6211b707068 |
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20359:4d3a43351904 | 20360:833b0f92429a |
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1 /* | |
2 * Copyright (c) 2014, 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 #ifndef SHARE_VM_UTILITIES_NATIVE_CALL_STACK_HPP | |
26 #define SHARE_VM_UTILITIES_NATIVE_CALL_STACK_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "services/nmtCommon.hpp" | |
30 #include "utilities/ostream.hpp" | |
31 | |
32 /* | |
33 * This class represents a native call path (does not include Java frame) | |
34 * | |
35 * This class is developed in the context of native memory tracking, it can | |
36 * be an useful tool for debugging purpose. | |
37 * | |
38 * For example, following code should print out native call path: | |
39 * | |
40 * .... | |
41 * NativeCallStack here; | |
42 * here.print_on(tty); | |
43 * .... | |
44 * | |
45 * However, there are a couple of restrictions on this class. If the restrictions are | |
46 * not strictly followed, it may break native memory tracking badly. | |
47 * | |
48 * 1. Number of stack frames to capture, is defined by native memory tracking. | |
49 * This number has impacts on how much memory to be used by native | |
50 * memory tracking. | |
51 * 2. The class is strict stack object, no heap or virtual memory can be allocated | |
52 * from it. | |
53 */ | |
54 class NativeCallStack : public StackObj { | |
55 private: | |
56 address _stack[NMT_TrackingStackDepth]; | |
57 int _hash_value; | |
58 | |
59 public: | |
60 NativeCallStack(int toSkip = 0, bool fillStack = false); | |
61 NativeCallStack(address* pc, int frameCount); | |
62 | |
63 | |
64 // if it is an empty stack | |
65 inline bool is_empty() const { | |
66 return _stack[0] == NULL; | |
67 } | |
68 | |
69 // number of stack frames captured | |
70 int frames() const; | |
71 | |
72 inline int compare(const NativeCallStack& other) const { | |
73 return memcmp(_stack, other._stack, sizeof(_stack)); | |
74 } | |
75 | |
76 inline bool equals(const NativeCallStack& other) const { | |
77 // compare hash values | |
78 if (hash() != other.hash()) return false; | |
79 // compare each frame | |
80 return compare(other) == 0; | |
81 } | |
82 | |
83 inline address get_frame(int index) const { | |
84 assert(index >= 0 && index < NMT_TrackingStackDepth, "Index out of bound"); | |
85 return _stack[index]; | |
86 } | |
87 | |
88 // Hash code. Any better algorithm? | |
89 int hash() const; | |
90 | |
91 void print_on(outputStream* out) const; | |
92 void print_on(outputStream* out, int indent) const; | |
93 }; | |
94 | |
95 #endif |