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15<TITLE>Pintos Projects: Development Tools</TITLE>
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37<HR SIZE=2>
38<H1> E. Development Tools </H1>
39<!--docid::SEC109::-->
40<P>
41
42Here are some tools that you might find useful while developing code.
43</P>
44<P>
45
46<A NAME="Tags"></A>
47<HR SIZE="6">
48<A NAME="SEC110"></A>
49<H2> E.1 Tags </H2>
50<!--docid::SEC110::-->
51<P>
52
53Tags are an index to the functions and global variables declared in a
54program. Many editors, including Emacs and <CODE>vi</CODE>, can use
55them. The <Q><TT>Makefile</TT></Q> in <Q><TT>pintos/src</TT></Q> produces Emacs-style
56tags with the command <CODE>make TAGS</CODE> or <CODE>vi</CODE>-style tags with
57<CODE>make tags</CODE>.
58</P>
59<P>
60
61In Emacs, use <KBD>M-.</KBD> to follow a tag in the current window,
62<KBD>C-x 4 .</KBD> in a new window, or <KBD>C-x 5 .</KBD> in a new frame. If
63your cursor is on a symbol name for any of those commands, it becomes
64the default target. If a tag name has multiple definitions, <KBD>M-0
65M-.</KBD> jumps to the next one. To jump back to where you were before
66you followed the last tag, use <KBD>M-*</KBD>.
67</P>
68<P>
69
70<A NAME="cscope"></A>
71<HR SIZE="6">
72<A NAME="SEC111"></A>
73<H2> E.2 cscope </H2>
74<!--docid::SEC111::-->
75<P>
76
77The <CODE>cscope</CODE> program also provides an index to functions and
78variables declared in a program. It has some features that tag
79facilities lack. Most notably, it can find all the points in a
80program at which a given function is called.
81</P>
82<P>
83
84The <Q><TT>Makefile</TT></Q> in <Q><TT>pintos/src</TT></Q> produces <CODE>cscope</CODE>
85indexes when it is invoked as <CODE>make cscope</CODE>. Once the index has
86been generated, run <CODE>cscope</CODE> from a shell command line; no
87command-line arguments are normally necessary. Then use the arrow
88keys to choose one of the search criteria listed near the bottom of
89the terminal, type in an identifier, and hit <KBD>Enter</KBD>.
90<CODE>cscope</CODE> will then display the matches in the upper part of
91the terminal. You may use the arrow keys to choose a particular
92match; if you then hit <KBD>Enter</KBD>, <CODE>cscope</CODE> will invoke the
93default system editor<A NAME="DOCF7" HREF="pintos_fot.html#FOOT7">(7)</A> and position the
94cursor on that match. To start a new search, type <KBD>Tab</KBD>. To exit
95<CODE>cscope</CODE>, type <KBD>Ctrl-d</KBD>.
96</P>
97<P>
98
99Emacs and some versions of <CODE>vi</CODE> have their own interfaces to
100<CODE>cscope</CODE>. For information on how to use these interface,
101visit <A HREF="http://cscope.sourceforge.net, the &lt;CODE&gt;cscope&lt;/CODE&gt; home
102page">http://cscope.sourceforge.net, the <CODE>cscope</CODE> home
103page</A>.
104</P>
105<P>
106
107<A NAME="git"></A>
108<HR SIZE="6">
109<A NAME="SEC112"></A>
110<H2> E.3 git </H2>
111<!--docid::SEC112::-->
112<P>
113
114git is a version-control system. That is, you can use it to keep
115track of multiple versions of files. The idea is that you do some
116work on your code and test it, then check it into the version-control
117system. If you decide that the work you've done since your last
118check-in is no good, you can easily revert to the last checked-in
119version. Furthermore, you can retrieve any old version of your code
120as of some given day and time. The version control logs tell you who
121made changes and when.
122</P>
123<P>
124
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131<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="pintos.html#SEC_Contents">Contents</A>]</TD>
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