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5d10d135 ASL |
1 | /******************************************************************************* |
2 | * Copyright (c) 2009 Ericsson | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are | |
5 | * made available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: | |
10 | * Alvaro Sanchez-Leon (alvsan09@gmail.com) - Initial API and implementation | |
11 | *******************************************************************************/ | |
12 | package org.eclipse.linuxtools.lttng.state.model; | |
13 | ||
14 | import java.util.Stack; | |
15 | ||
16 | import org.eclipse.linuxtools.lttng.state.StateStrings; | |
17 | import org.eclipse.linuxtools.lttng.state.StateStrings.CpuMode; | |
18 | ||
19 | /** | |
20 | * <b><u>LTTngCPUState</u></b> | |
21 | * <p> | |
22 | * | |
23 | */ | |
24 | public class LTTngCPUState implements Cloneable { | |
25 | // ======================================================================== | |
26 | // Data | |
27 | // ======================================================================= | |
28 | private Stack<StateStrings.CpuMode> mode_stack = new Stack<StateStrings.CpuMode>(); | |
29 | private Stack<Long> irq_stack = new Stack<Long>(); | |
30 | private Stack<Long> softirq_stack = new Stack<Long>(); | |
31 | private Stack<Long> trap_stack = new Stack<Long>(); | |
32 | ||
33 | // ======================================================================== | |
34 | // Constructor | |
35 | // ======================================================================= | |
36 | public LTTngCPUState() { | |
37 | mode_stack.push(CpuMode.LTTV_CPU_UNKNOWN); | |
38 | irq_stack.push(-1L); | |
39 | softirq_stack.push(-1L); | |
40 | trap_stack.push(-1L); | |
41 | } | |
42 | ||
43 | @Override | |
44 | @SuppressWarnings("unchecked") | |
45 | public LTTngCPUState clone() { | |
46 | LTTngCPUState newState = null; | |
47 | ||
48 | try { | |
49 | newState = (LTTngCPUState) super.clone(); | |
50 | ||
51 | // // *** IMPORTANT *** | |
52 | // // Basic type in java are immutable! | |
53 | // // Thus, using assignation ("=") on basic type is CORRECT, | |
54 | // // but we should ALWAYS use "new" or "clone()" on "non basic" | |
55 | // type | |
56 | ||
57 | // Clone should work correctly for all stack object that contain | |
58 | // basic java object (String, Long, etc...) | |
59 | newState.mode_stack = (Stack<StateStrings.CpuMode>) this.mode_stack | |
60 | .clone(); | |
61 | newState.irq_stack = (Stack<Long>) this.irq_stack.clone(); | |
62 | newState.softirq_stack = (Stack<Long>) this.softirq_stack.clone(); | |
63 | newState.trap_stack = (Stack<Long>) this.trap_stack.clone(); | |
64 | } catch (CloneNotSupportedException e) { | |
65 | System.out.println("Cloning failed with : " + e.getMessage()); | |
66 | } | |
67 | ||
68 | return newState; | |
69 | } | |
70 | ||
71 | // ======================================================================== | |
72 | // Methods | |
73 | public void clearAndSetBaseToCpuStack(StateStrings.CpuMode newCpuMode) { | |
74 | mode_stack.clear(); | |
75 | irq_stack.clear(); | |
76 | softirq_stack.clear(); | |
77 | trap_stack.clear(); | |
78 | ||
79 | // Ensure that there is always at least 1 item in the stack | |
80 | mode_stack.push(newCpuMode); | |
81 | irq_stack.push(-1L); | |
82 | softirq_stack.push(-1L); | |
83 | trap_stack.push(-1L); | |
84 | } | |
85 | ||
86 | // Push to stacks | |
87 | public void pushToCpuStack(StateStrings.CpuMode newCpuMode) { | |
88 | mode_stack.push(newCpuMode); | |
89 | } | |
90 | ||
91 | public void pushToIrqStack(Long irqID) { | |
92 | irq_stack.push(irqID); | |
93 | } | |
94 | ||
95 | public void pushToSoftIrqStack(Long softIrqID) { | |
96 | softirq_stack.push(softIrqID); | |
97 | } | |
98 | ||
99 | public void pushToTrapStack(Long trapID) { | |
100 | trap_stack.push(trapID); | |
101 | } | |
102 | ||
103 | // Pop from stacks | |
104 | public StateStrings.CpuMode popFromCpuStack() { | |
105 | ||
106 | StateStrings.CpuMode returnedMode = mode_stack.pop(); | |
107 | ||
108 | if (mode_stack.size() < 1) { | |
109 | // Ensure that there is always at least 1 item in the stack | |
110 | mode_stack.push(StateStrings.CpuMode.LTTV_CPU_UNKNOWN); | |
111 | } | |
112 | ||
113 | return returnedMode; | |
114 | ||
115 | } | |
116 | ||
117 | public Long popFromIrqStack() { | |
118 | Long irq = irq_stack.pop(); | |
119 | ||
120 | if (irq_stack.size() < 1) { | |
121 | // make sure the stack is not empty | |
122 | irq_stack.push(-1L); | |
123 | } | |
124 | return irq; | |
125 | } | |
126 | ||
127 | public Long popFromSoftIrqStack() { | |
128 | Long softirq = softirq_stack.pop(); | |
129 | ||
130 | if (softirq_stack.size() < 1) { | |
131 | // make sure the stack is not empty | |
132 | softirq_stack.push(-1L); | |
133 | } | |
134 | return softirq; | |
135 | } | |
136 | ||
137 | public Long popFromTrapStack() { | |
138 | Long trap = trap_stack.pop(); | |
139 | ||
140 | if (trap_stack.size() < 1) { | |
141 | // make sure the stack is not empty | |
142 | trap_stack.push(-1L); | |
143 | } | |
144 | return trap; | |
145 | } | |
146 | ||
147 | // Peek from stacks | |
148 | public StateStrings.CpuMode peekFromCpuStack() { | |
149 | return mode_stack.peek(); | |
150 | } | |
151 | ||
152 | public Long peekFromIrqStack() { | |
153 | return irq_stack.peek(); | |
154 | } | |
155 | ||
156 | public Long peekFromSoftIrqStack() { | |
157 | return softirq_stack.peek(); | |
158 | } | |
159 | ||
160 | public Long peekFromTrapStack() { | |
161 | return trap_stack.peek(); | |
162 | } | |
163 | ||
164 | ||
165 | public void reset() { | |
166 | mode_stack.clear(); | |
167 | irq_stack.clear(); | |
168 | softirq_stack.clear(); | |
169 | trap_stack.clear(); | |
170 | ||
171 | // Ensure that there is always at least 1 item in the stack | |
172 | mode_stack.push(CpuMode.LTTV_CPU_UNKNOWN); | |
173 | irq_stack.push(-1L); | |
174 | softirq_stack.push(-1L); | |
175 | trap_stack.push(-1L); | |
176 | } | |
177 | ||
178 | } |