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* Fix <>'s in code to be &lt;&gt;'s

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* Add section describing how we prefer #includes to be ordered


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7697 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-07 21:45:47 +00:00
parent 3d9cafa003
commit 2e5cbc218c
1 changed files with 54 additions and 26 deletions
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@ -14,6 +14,7 @@
<ol>
<li><a href="#scf_commenting">Commenting</a>
<li><a href="#scf_commentformat">Comment Formatting</a>
<li><a href="#scf_includes">#include Style</a>
<li><a href="#scf_codewidth">Source Code Width</a>
<li><a href="#scf_spacestabs">Use Spaces Instead of Tabs</a>
<li><a href="#scf_indentation">Indent Code Consistently</a>
@ -123,6 +124,39 @@ In general, prefer C++ style (<tt>//</tt>) comments. They take less space, requ
To comment out a large block of code, use <tt>#if 0</tt> and <tt>#endif</tt>. These nest properly and are better behaved in general than C style comments.<p>
<!-- _______________________________________________________________________ -->
</ul><a name="scf_includes"><h4><hr size=0>#include Style</h4><ul>
Immediately after the <a href="#scf_commenting">header file comment</a> (and
include guards if working on a header file), the <a
href="hl_dontinclude">minimal</a> list of #includes required by the file should
be listed. We prefer these #includes to be listed in this order:<p>
<ol>
<li><a href="#mmheader">Main Module header</a>
<li><a href="#hl_privateheaders">Local/Private Headers</a>
<li>llvm/*
<li>llvm/Analysis/*
<li>llvm/Assembly/*
<li>llvm/Bytecode/*
<li>llvm/CodeGen/*
<li>...
<li>Support/*
<li>Config/*
<li>System #includes
</ol>
... and each catagory should be sorted by name.<p>
<a name="mmheader">The "Main Module Header" file applies to .cpp file which
implement an interface defined by a .h file. This #include should always be
included <b>first</b> regardless of where it lives on the file system. By
including a header file first in the .cpp files that implement the interfaces,
we ensure that the header does not have any hidden dependencies which are not
explicitly #included in the header, but should be. It is also a form of
documentation in the .cpp file to indicate where the interfaces it implements
are defined.<p>
<!-- _______________________________________________________________________ -->
</ul><a name="scf_codewidth"><h4><hr size=0>Source Code Width</h4><ul>
@ -253,12 +287,6 @@ of these</a> that defines an interface. This interface may be several
functions, classes or data structures, but the important issue is how they work
together.<p>
<!--One example of this is the <tt>llvm/include/llvm/CFG.h</tt> file. It
defines a collection of global functions, template classes, and member functions
that are syntactically unrelated to each other. Semantically, however, they all
provide useful functionality for operating on a CFG, and so they are bound
together.<p> -->
In general, a module should be implemented with one or more <tt>.cpp</tt> files.
Each of these <tt>.cpp</tt> files should include the header that defines their
interface first. This ensure that all of the dependences of the module header
@ -450,13 +478,13 @@ rather than a set of member functions, which leaves some leeway in how
you actually implement it. Typically it looks something like this
(I'll start with the const-iterator-only situation):
#include <iterator>
#include &lt;iterator&gt;
class container {
public:
typedef something_or_other value_type;
class const_iterator:
public std::iterator<std::forward_iterator_tag, value_type> {
public std::iterator&lt;std::forward_iterator_tag, value_type&gt; {
friend class container;
public:
const value_type&amp; operator*() const;
@ -568,7 +596,7 @@ the simple addition of a second class.
typedef something_or_other value_type;
class const_iterator;
class iterator:
public std::iterator<std::forward_iterator_tag, value_type> {
public std::iterator&lt;std::forward_iterator_tag, value_type&gt; {
friend class container;
friend class container::const_iterator;
public:
@ -582,7 +610,7 @@ the simple addition of a second class.
//...
};
class const_iterator:
public std::iterator<std::forward_iterator_tag, value_type> {
public std::iterator&lt;std::forward_iterator_tag, value_type&gt; {
friend class container;
public:
const_iterator();
@ -615,7 +643,7 @@ Bidirectional iterators add just two member functions to forward
iterators:
class iterator:
public std::iterator<std::bidirectional_iterator_tag, value_type> {
public std::iterator&lt;std::bidirectional_iterator_tag, value_type&gt; {
public:
//...
iterator&amp; operator--();
@ -629,7 +657,7 @@ operator++().
Random access iterators add several more member and friend functions:
class iterator:
public std::iterator<std::random_access_iterator_tag, value_type> {
public std::iterator&lt;std::random_access_iterator_tag, value_type&gt; {
public:
//...
iterator&amp; operator+=(difference_type rhs);
@ -638,10 +666,10 @@ Random access iterators add several more member and friend functions:
friend iterator operator+(difference_type lhs, iterator rhs);
friend iterator operator-(iterator lhs, difference_type rhs);
friend difference_type operator-(iterator lhs, iterator rhs);
friend bool operator<(iterator lhs, iterator rhs);
friend bool operator>(iterator lhs, iterator rhs);
friend bool operator<=(iterator lhs, iterator rhs);
friend bool operator>=(iterator lhs, iterator rhs);
friend bool operator&lt;(iterator lhs, iterator rhs);
friend bool operator&gt;(iterator lhs, iterator rhs);
friend bool operator&lt;=(iterator lhs, iterator rhs);
friend bool operator&gt;=(iterator lhs, iterator rhs);
//...
};
@ -677,24 +705,24 @@ Random access iterators add several more member and friend functions:
// calculate distance between iterators
}
bool operator<(container::iterator lhs, container::iterator rhs) {
bool operator&lt;(container::iterator lhs, container::iterator rhs) {
// perform less-than comparison
}
bool operator>(container::iterator lhs, container::iterator rhs) {
return rhs < lhs;
bool operator&gt;(container::iterator lhs, container::iterator rhs) {
return rhs &lt; lhs;
}
bool operator<=(container::iterator lhs, container::iterator rhs) {
return !(rhs < lhs);
bool operator&lt;=(container::iterator lhs, container::iterator rhs) {
return !(rhs &lt; lhs);
}
bool operator>=(container::iterator lhs, container::iterator rhs) {
return !(lhs < rhs);
bool operator&gt;=(container::iterator lhs, container::iterator rhs) {
return !(lhs &lt; rhs);
}
Four of the functions (operator+=(), operator-=(), the second
operator-(), and operator<()) are nontrivial; the rest are
operator-(), and operator&lt;()) are nontrivial; the rest are
boilerplate.
One feature of the above code that some experts may disapprove of is
@ -712,7 +740,7 @@ I hope all this is some help to anyone who needs to write their own
STL-like containers and iterators.
--
Ross Smith <ross.s@ihug.co.nz> The Internet Group, Auckland, New Zealand
Ross Smith &lt;ross.s@ihug.co.nz&gt; The Internet Group, Auckland, New Zealand
</pre>
@ -741,7 +769,7 @@ If you get some free time, and you haven't read them: do so, you might learn som
<address><a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Jan 23 15:19:28 CST 2001 -->
<!-- hhmts start -->
Last modified: Fri Jul 25 12:29:52 CDT 2003
Last modified: Thu Aug 7 16:44:33 CDT 2003
<!-- hhmts end -->
</font>
</body></html>