Definitions. Error. A wrong decision made during software development
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1 Debuggig
2 Defiitios Error A wrog decisio made durig software developmet
3 Defiitios 2 Error A wrog decisio made durig software developmet Defect bug sometimes meas this The term Fault is also used Property of software that may cause the system to deviate from its iteded behaviour
4 Defiitios 3 Error A wrog decisio made durig software developmet Defect bug sometimes meas this The term Fault is also used Property of software that may cause the system to deviate from its iteded behaviour Fault bug sometimes meas this The term Failure is also used The evet i which software deviates from its iteded behaviour
5 Defiitios 4 Error A wrog decisio made durig software developmet Defect bug sometimes meas this The term Fault is also used Property of software that may cause the system to deviate from its iteded behaviour Fault bug sometimes meas this The term Failure is also used The evet i which software deviates from its iteded behaviour Error ==> Defect ==> Fault Error ==> Fault ==> Failure
6 What is debuggig? Debug 6
7 What is debuggig? 2 You have ru a test that detects a fault Debug 7
8 What is debuggig? 3 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig Debug 8
9 What is debuggig? 4 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect Debug 9
10 What is debuggig? 5 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect What do you do? Debug 10
11 What is debuggig? 6 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect What do you do? You trace the executio path followed by the test Debug 11
12 What is debuggig? 7 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect What do you do? You trace the executio path followed by the test Check the state of the program at each step Debug 12
13 What is debuggig? 8 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect What do you do? You trace the executio path followed by the test Check the state of the program at each step Util you fid the error Debug 13
14 What is debuggig? 9 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect What do you do? You trace the executio path followed by the test Check the state of the program at each step Util you fid the error Correct the error by??? Debug 14
15 What is debuggig? 10 You have ru a test that detects a fault Assumig the test is correct, that implies there is a defect i the program you are testig You wat to fid the error i your desig / implemetatio that led to the defect What do you do? You trace the executio path followed by the test Check the state of the program at each step Util you fid the error Correct the error by Esurig the program correctly implemets the desig Esurig the desig is correct Debug 15
16 Fudametal method prit the (sub)state Beefit The method works i the vast majority of cases, i all laguages ad all operatig systems Debug 16
17 Fudametal method prit the (sub)state Beefit The method works i the vast majority of cases, i all laguages ad all operatig systems No eed to lear or deped upo a tool customized for the laguage ad operatig system Debug 17
18 Fudametal method prit the (sub)state Beefit The method works i the vast majority of cases, i all laguages ad all operatig systems No eed to lear or deped upo a tool customized for the laguage ad operatig system After makig a chage, you ru the program ad see if state is correct where it was wrog before Debug 18
19 Fudametal method prit the (sub)state Drawback It is primitive ad very ad hoc Debug 19
20 Fudametal method prit the (sub)state Drawback It is primitive ad very ad hoc Program text is added to the system, that eeds to be removed oce the error has bee fixed Debug 20
21 Fudametal method prit the (sub)state Drawback It is primitive ad very ad hoc Program text is added to the system, that eeds to be removed oce the error has bee fixed It iteracts with the ormal output of the program Debug 21
22 Fudametal method prit the (sub)state Drawback It is primitive ad very ad hoc Program text is added to the system, that eeds to be removed oce the error has bee fixed It iteracts with the ormal output of the program Ca produce volumious output Debug 22
23 Fudametal method prit the (sub)state Drawback It is primitive ad very ad hoc Program text is added to the system, that eeds to be removed oce the error has bee fixed It iteracts with the ormal output of the program Ca produce volumious output Have to worry about buffered output, which meas the last few output lies may ot appear Debug 23
24 Loggig Use the Logger class istead of usig System.out.pritl Logger.getGlobal().ifo Debug 24
25 Loggig Use the Logger class istead of usig System.out.pritl Logger.getGlobal().ifo You ca have fier-grai loggig. Use fie or severe, i place of ifo Debug 25
26 Loggig Use the Logger class istead of usig System.out.pritl Logger.getGlobal().ifo You ca have fier-grai loggig. Use fie or severe, i place of ifo The API is i java.util.loggig Debug 26
27 Loggig Use the Logger class istead of usig System.out.pritl Logger.getGlobal().ifo You ca have fier-grai loggig. Use fie or severe, i place of ifo The API is i java.util.loggig You ca tur off all loggig with Logger.getGlobal().setLevel(Level.OFF); Debug 27
28 Assertios Be defesive, add assertios to the program Debug 28
29 Assertios Be defesive, add assertios to the program See Programmig with Assertios docs.oracle.com/javase/7/docs/techotes/guides/laguage/assert.html Debug 29
30 Assertios Be defesive, add assertios to the program See Programmig with Assertios docs.oracle.com/javase/7/docs/techotes/guides/laguage/assert.html Assert statemets exist i C, C++, Java, Eiffel Check existece i other laguages Debug 30
31 Assertios Be defesive, add assertios to the program See Programmig with Assertios docs.oracle.com/javase/7/docs/techotes/guides/laguage/assert.html Assert statemets exist i C, C++, Java, Eiffel Check existece i other laguages Assertios ca be implemeted with if the If ot assertio the have a exceptio / problem fi Debug 31
32 Assertios Be defesive, add assertios to the program See Programmig with Assertios docs.oracle.com/javase/7/docs/techotes/guides/laguage/assert.html Assert statemets exist i C, C++, Java, Eiffel Check existece i other laguages Assertios ca be implemeted with if the If ot assertio the have a exceptio / problem fi Jet Propulsio Lab has all its software i C ad madates the use of assertios Debug 32
33 Eable assertios i Eclipse Go to Ru à ru cofiguratios Uder Java Applicatio select the applicatio to use assertios Here Copy_Examples Select Argumets tab Add ea i VM argumets Debug 33
34 Debug Flags Whe debuggig it is useful to tur o ad off various features i a program Debug 34
35 Debug Flags Whe debuggig it is useful to tur o ad off various features i a program Especially debug output Debug 35
36 Debug Flags Whe debuggig it is useful to tur o ad off various features i a program Especially debug output Create a Debug class that cotais Boolea flags that ca be set, reset ad toggled Debug 36
37 Debug Flags Whe debuggig it is useful to tur o ad off various features i a program Especially debug output Create a Debug class that cotais Boolea flags that ca be set, reset ad toggled Use the flags i if statemets that surroud iterestig sectios of your program Debug 37
38 Debug Flags Whe debuggig it is useful to tur o ad off various features i a program Especially debug output Create a Debug class that cotais Boolea flags that ca be set, reset ad toggled Use the flags i if statemets that surroud iterestig sectios of your program For differet test rus give differet settigs of true ad false to the flags Debug 38
39 Debug Flags 2 Example if Debug.flag0 the Block1 fi if Debug.flag1 the Block2 fi if Debug.flag3 the Block3 if Debug.flag4 the Block4 fi fi Depedig upo the values of flag0.. flag3 differet combiatios of Block1.. Block4 are executed Debug 39
40 Program istrumetatio Isertig debug write / log statemets ad usig debug flags is called program istrumetatio Debug 40
41 Program istrumetatio Isertig debug write / log statemets ad usig debug flags is called program istrumetatio Used judiciously it is a useful method Debug 41
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