mirror of
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999cf0984e
rtti (they shouldn't be used in the main compiler, but that's because optimizations aren't allowed to fail!) Remove the big section about iterators, because people who do not know what they are doing shouldn't be writing them. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13670 91177308-0d34-0410-b5e6-96231b3b80d8
613 lines
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HTML
613 lines
23 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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<title>A Few Coding Standards</title>
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</head>
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<body>
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<div class="doc_title">
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A Few Coding Standards
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</div>
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<ol>
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<li><a href="#introduction">Introduction</a></li>
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<li><a href="#mechanicalissues">Mechanical Source Issues</a>
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<ol>
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<li><a href="#sourceformating">Source Code Formatting</a>
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<ol>
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<li><a href="#scf_commenting">Commenting</a></li>
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<li><a href="#scf_commentformat">Comment Formatting</a></li>
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<li><a href="#scf_includes">#include Style</a></li>
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<li><a href="#scf_codewidth">Source Code Width</a></li>
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<li><a href="#scf_spacestabs">Use Spaces Instead of Tabs</a></li>
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<li><a href="#scf_indentation">Indent Code Consistently</a></li>
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</ol></li>
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<li><a href="#compilerissues">Compiler Issues</a>
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<ol>
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<li><a href="#ci_warningerrors">Treat Compiler Warnings Like
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Errors</a></li>
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<li><a href="#ci_portable_code">Write Portable Code</a></li>
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</ol></li>
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</ol></li>
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<li><a href="#styleissues">Style Issues</a>
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<ol>
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<li><a href="#macro">The High Level Issues</a>
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<ol>
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<li><a href="#hl_module">A Public Header File <b>is</b> a
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Module</a></li>
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<li><a href="#hl_dontinclude">#include as Little as Possible</a></li>
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<li><a href="#hl_privateheaders">Keep "internal" Headers
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Private</a></li>
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</ol></li>
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<li><a href="#micro">The Low Level Issues</a>
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<ol>
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<li><a href="#hl_assert">Assert Liberally</a></li>
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<li><a href="#hl_preincrement">Prefer Preincrement</a></li>
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<li><a href="#hl_avoidendl">Avoid std::endl</a></li>
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<li><a href="#hl_exploitcpp">Exploit C++ to its Fullest</a></li>
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</ol></li>
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</ol></li>
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<li><a href="#seealso">See Also</a></li>
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</ol>
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<div class="doc_author">
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<p>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="introduction">Introduction</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This document attempts to describe a few coding standards that are being used
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in the LLVM source tree. Although no coding standards should be regarded as
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absolute requirements to be followed in all instances, coding standards can be
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useful.</p>
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<p>This document intentionally does not prescribe fixed standards for religious
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issues such as brace placement and space usage. For issues like this, follow
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the golden rule:</p>
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<blockquote>
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<p><b><a name="goldenrule">If you are adding a significant body of source to a
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project, feel free to use whatever style you are most comfortable with. If you
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are extending, enhancing, or bug fixing already implemented code, use the style
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that is already being used so that the source is uniform and easy to
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follow.</a></b></p>
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</blockquote>
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<p>The ultimate goal of these guidelines is the increase readability and
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maintainability of our common source base. If you have suggestions for topics to
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be included, please mail them to <a
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href="mailto:sabre@nondot.org">Chris</a>.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="mechanicalissues">Mechanical Source Issues</a>
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</div>
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<!-- *********************************************************************** -->
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="sourceformating">Source Code Formatting</a>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="scf_commenting">Commenting</a>
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</div>
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<div class="doc_text">
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<p>Comments are one critical part of readability and maintainability. Everyone
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knows they should comment, so should you. :) Although we all should probably
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comment our code more than we do, there are a few very critical places that
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documentation is very useful:</p>
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<b>File Headers</b>
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<p>Every source file should have a header on it that
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describes the basic purpose of the file. If a file does not have a header, it
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should not be checked into CVS. Most source trees will probably have a standard
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file header format. The standard format for the LLVM source tree looks like
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this:</p>
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<pre>
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//===-- llvm/Instruction.h - Instruction class definition -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the Instruction class, which is the
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// base class for all of the VM instructions.
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//
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//===----------------------------------------------------------------------===//
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</pre>
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<p>A few things to note about this particular format: The "<tt>-*- C++
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-*-</tt>" string on the first line is there to tell Emacs that the source file
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is a C++ file, not a C file (Emacs assumes .h files are C files by default [Note
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that tag this is not necessary in .cpp files]). The name of the file is also on
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the first line, along with a very short description of the purpose of the file.
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This is important when printing out code and flipping though lots of pages.</p>
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<p>The next section in the file is a concise note that defines the license that
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the file is released under. This makes it perfectly clear what terms the source
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code can be distributed under.</p>
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<p>The main body of the description does not have to be very long in most cases.
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Here it's only two lines. If an algorithm is being implemented or something
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tricky is going on, a reference to the paper where it is published should be
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included, as well as any notes or "gotchas" in the code to watch out for.</p>
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<b>Class overviews</b>
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<p>Classes are one fundemental part of a good object oriented design. As such,
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a class definition should have a comment block that explains what the class is
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used for... if it's not obvious. If it's so completely obvious your grandma
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could figure it out, it's probably safe to leave it out. Naming classes
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something sane goes a long ways towards avoiding writing documentation. :)</p>
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<b>Method information</b>
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<p>Methods defined in a class (as well as any global functions) should also be
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documented properly. A quick note about what it does any a description of the
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borderline behaviour is all that is necessary here (unless something
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particularly tricky or insideous is going on). The hope is that people can
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figure out how to use your interfaces without reading the code itself... that is
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the goal metric.</p>
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<p>Good things to talk about here are what happens when something unexpected
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happens: does the method return null? Abort? Format your hard disk?</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="scf_commentformat">Comment Formatting</a>
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</div>
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<div class="doc_text">
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<p>In general, prefer C++ style (<tt>//</tt>) comments. They take less space,
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require less typing, don't have nesting problems, etc. There are a few cases
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when it is useful to use C style (<tt>/* */</tt>) comments however:</p>
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<ol>
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<li>When writing a C code: Obviously if you are writing C code, use C style
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comments. :)</li>
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<li>When writing a header file that may be #included by a C source file.</li>
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<li>When writing a source file that is used by a tool that only accepts C
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style comments.</li>
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</ol>
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<p>To comment out a large block of code, use <tt>#if 0</tt> and <tt>#endif</tt>.
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These nest properly and are better behaved in general than C style comments.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="scf_includes">#include Style</a>
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</div>
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<div class="doc_text">
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<p>Immediately after the <a href="#scf_commenting">header file comment</a> (and
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include guards if working on a header file), the <a
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href="hl_dontinclude">minimal</a> list of #includes required by the file should
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be listed. We prefer these #includes to be listed in this order:</p>
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<ol>
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<li><a href="#mmheader">Main Module header</a></li>
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<li><a href="#hl_privateheaders">Local/Private Headers</a></li>
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<li>llvm/*</li>
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<li>llvm/Analysis/*</li>
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<li>llvm/Assembly/*</li>
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<li>llvm/Bytecode/*</li>
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<li>llvm/CodeGen/*</li>
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<li>...</li>
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<li>Support/*</li>
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<li>Config/*</li>
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<li>System #includes</li>
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</ol>
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<p>... and each catagory should be sorted by name.</p>
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<p><a name="mmheader">The "Main Module Header"</a> file applies to .cpp file
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which implement an interface defined by a .h file. This #include should always
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be included <b>first</b> regardless of where it lives on the file system. By
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including a header file first in the .cpp files that implement the interfaces,
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we ensure that the header does not have any hidden dependencies which are not
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explicitly #included in the header, but should be. It is also a form of
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documentation in the .cpp file to indicate where the interfaces it implements
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are defined.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="scf_codewidth">Source Code Width</a>
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</div>
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<div class="doc_text">
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<p>Write your code to fit within 80 columns of text. This helps those of us who
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like to print out code and look at your code in an xterm without resizing
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it.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="scf_spacestabs">Use Spaces Instead of Tabs</a>
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</div>
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<div class="doc_text">
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<p>In all cases, prefer spaces to tabs in source files. People have different
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prefered indentation levels, and different styles of indentation that they
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like... this is fine. What isn't is that different editors/viewers expand tabs
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out to different tab stops. This can cause your code to look completely
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unreadable, and it is not worth dealing with.</p>
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<p>As always, follow the <a href="#goldenrule">Golden Rule</a> above: follow the
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style of existing code if your are modifying and extending it. If you like four
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spaces of indentation, <b>DO NOT</b> do that in the middle of a chunk of code
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with two spaces of indentation. Also, do not reindent a whole source file: it
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makes for incredible diffs that are absolutely worthless.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="scf_indentation">Indent Code Consistently</a>
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</div>
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<div class="doc_text">
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<p>Okay, your first year of programming you were told that indentation is
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important. If you didn't believe and internalize this then, now is the time.
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Just do it.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="compilerissues">Compiler Issues</a>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="ci_warningerrors">Treat Compiler Warnings Like Errors</a>
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</div>
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<div class="doc_text">
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<p>If your code has compiler warnings in it, something is wrong: you aren't
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casting values correctly, your have "questionable" constructs in your code, or
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you are doing something legitimately wrong. Compiler warnings can cover up
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legitimate errors in output and make dealing with a translation unit
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difficult.</p>
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<p>It is not possible to prevent all warnings from all compilers, nor is it
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desirable. Instead, pick a standard compiler (like <tt>gcc</tt>) that provides
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a good thorough set of warnings, and stick to them. At least in the case of
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<tt>gcc</tt>, it is possible to work around any spurious errors by changing the
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syntax of the code slightly. For example, an warning that annoys me occurs when
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I write code like this:</p>
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<pre>
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if (V = getValue()) {
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..
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}
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</pre>
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<p><tt>gcc</tt> will warn me that I probably want to use the <tt>==</tt>
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operator, and that I probably mistyped it. In most cases, I haven't, and I
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really don't want the spurious errors. To fix this particular problem, I
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rewrite the code like this:</p>
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<pre>
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if ((V = getValue())) {
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..
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}
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</pre>
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<p>...which shuts <tt>gcc</tt> up. Any <tt>gcc</tt> warning that annoys you can
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be fixed by massaging the code appropriately.</p>
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<p>These are the <tt>gcc</tt> warnings that I prefer to enable: <tt>-Wall
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-Winline -W -Wwrite-strings -Wno-unused</tt></p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="ci_portable_code">Write Portable Code</a>
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</div>
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<div class="doc_text">
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<p>In almost all cases, it is possible and within reason to write completely
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portable code. If there are cases where it isn't possible to write portable
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code, isolate it behind a well defined (and well documented) interface.</p>
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<p>In practice, this means that you shouldn't assume much about the host
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compiler, including its support for "high tech" features like partial
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specialization of templates. In fact, Visual C++ 6 could be an important target
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for our work in the future, and we don't want to have to rewrite all of our code
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to support it.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="styleissues">Style Issues</a>
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</div>
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<!-- *********************************************************************** -->
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="macro">The High Level Issues</a>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="hl_module">A Public Header File <b>is</b> a Module</a>
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</div>
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<div class="doc_text">
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<p>C++ doesn't do too well in the modularity department. There is no real
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encapsulation or data hiding (unless you use expensive protocol classes), but it
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is what we have to work with. When you write a public header file (in the LLVM
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source tree, they live in the top level "include" directory), you are defining a
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module of functionality.</p>
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<p>Ideally, modules should be completely independent of each other, and their
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header files should only include the absolute minimum number of headers
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possible. A module is not just a class, a function, or a namespace: <a
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href="http://www.cuj.com/articles/2000/0002/0002c/0002c.htm">it's a collection
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of these</a> that defines an interface. This interface may be several
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functions, classes or data structures, but the important issue is how they work
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together.</p>
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<p>In general, a module should be implemented with one or more <tt>.cpp</tt>
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files. Each of these <tt>.cpp</tt> files should include the header that defines
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their interface first. This ensure that all of the dependences of the module
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header have been properly added to the module header itself, and are not
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implicit. System headers should be included after user headers for a
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translation unit.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="hl_dontinclude">#include as Little as Possible</a>
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</div>
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<div class="doc_text">
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<p><tt>#include</tt> hurts compile time performance. Don't do it unless you
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have to, especially in header files.</p>
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<p>But wait, sometimes you need to have the definition of a class to use it, or
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to inherit from it. In these cases go ahead and #include that header file. Be
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aware however that there are many cases where you don't need to have the full
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definition of a class. If you are using a pointer or reference to a class, you
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don't need the header file. If you are simply returning a class instance from a
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prototyped function or method, you don't need it. In fact, for most cases, you
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simply don't need the definition of a class... and not <tt>#include</tt>'ing
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speeds up compilation.</p>
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<p>It is easy to try to go too overboard on this recommendation, however. You
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<b>must</b> include all of the header files that you are using, either directly
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or indirectly (through another header file). To make sure that you don't
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accidently forget to include a header file in your module header, make sure to
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include your module header <b>first</b> in the implementation file (as mentioned
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above). This way there won't be any hidden dependencies that you'll find out
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about later...</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="hl_privateheaders">Keep "internal" Headers Private</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
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<p>Many modules have a complex implementation that causes them to use more than
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one implementation (<tt>.cpp</tt>) file. It is often tempting to put the
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internal communication interface (helper classes, extra functions, etc) in the
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public module header file. Don't do this. :)</p>
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<p>If you really need to do something like this, put a private header file in
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the same directory as the source files, and include it locally. This ensures
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that your private interface remains private and undisturbed by outsiders.</p>
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<p>Note however, that it's okay to put extra implementation methods a public
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class itself... just make them private (or protected), and all is well.</p>
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</div>
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<!-- ======================================================================= -->
|
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<div class="doc_subsection">
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|
<a name="micro">The Low Level Issues</a>
|
|
</div>
|
|
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection">
|
|
<a name="hl_assert">Assert Liberally</a>
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|
</div>
|
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|
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<div class="doc_text">
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<p>Use the "<tt>assert</tt>" function to its fullest. Check all of your
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preconditions and assumptions, you never know when a bug (not neccesarily even
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yours) might be caught early by an assertion, which reduces debugging time
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dramatically. The "<tt><cassert></tt>" header file is probably already
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included by the header files you are using, so it doesn't cost anything to use
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it.</p>
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|
|
<p>To further assist with debugging, make sure to put some kind of error message
|
|
in the assertion statement (which is printed if the assertion is tripped). This
|
|
helps the poor debugging make sense of why an assertion is being made and
|
|
enforced, and hopefully what to do about it. Here is one complete example:</p>
|
|
|
|
<pre>
|
|
inline Value *getOperand(unsigned i) {
|
|
assert(i < Operands.size() && "getOperand() out of range!");
|
|
return Operands[i];
|
|
}
|
|
</pre>
|
|
|
|
<p>Here are some examples:</p>
|
|
|
|
<pre>
|
|
assert(Ty->isPointerType() && "Can't allocate a non pointer type!");
|
|
|
|
assert((Opcode == Shl || Opcode == Shr) && "ShiftInst Opcode invalid!");
|
|
|
|
assert(idx < getNumSuccessors() && "Successor # out of range!");
|
|
|
|
assert(V1.getType() == V2.getType() && "Constant types must be identical!");
|
|
|
|
assert(isa<PHINode>(Succ->front()) && "Only works on PHId BBs!");
|
|
</pre>
|
|
|
|
<p>You get the idea...</p>
|
|
|
|
</div>
|
|
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection">
|
|
<a name="hl_preincrement">Prefer Preincrement</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>Hard fast rule: Preincrement (++X) may be no slower than postincrement (X++)
|
|
and could very well be a lot faster than it. Use preincrementation whenever
|
|
possible.</p>
|
|
|
|
<p>The semantics of postincrement include making a copy of the value being
|
|
incremented, returning it, and then preincrementing the "work value". For
|
|
primitive types, this isn't a big deal... but for iterators, it can be a huge
|
|
issue (for example, some iterators contains stack and set objects in them...
|
|
copying an iterator could invoke the copy ctor's of these as well). In general,
|
|
get in the habit of always using preincrement, and you won't have a problem.</p>
|
|
|
|
</div>
|
|
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection">
|
|
<a name="hl_avoidendl">Avoid std::endl</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>The <tt>std::endl</tt> modifier, when used with iostreams outputs a newline
|
|
to the output stream specified. In addition to doing this, however, it also
|
|
flushes the output stream. In other words, these are equivalent:</p>
|
|
|
|
<pre>
|
|
std::cout << std::endl;
|
|
std::cout << "\n" << std::flush;
|
|
</pre>
|
|
|
|
<p>Most of the time, you probably have no reason to flush the output stream, so
|
|
it's better to use a literal <tt>"\n"</tt>.</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection">
|
|
<a name="hl_exploitcpp">Exploit C++ to its Fullest</a>
|
|
</div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>C++ is a powerful language. With a firm grasp on its capabilities, you can make
|
|
write effective, consise, readable and maintainable code all at the same time.
|
|
By staying consistent, you reduce the amount of special cases that need to be
|
|
remembered. Reducing the total number of lines of code you write is a good way
|
|
to avoid documentation, and avoid giving bugs a place to hide.</p>
|
|
|
|
<p>For these reasons, come to know and love the contents of your local
|
|
<algorithm> header file. Know about <functional> and what it can do
|
|
for you. C++ is just a tool that wants you to master it. :)</p>
|
|
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<div class="doc_section">
|
|
<a name="seealso">See Also</a>
|
|
</div>
|
|
<!-- *********************************************************************** -->
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>A lot of these comments and recommendations have been culled for other
|
|
sources. Two particularly important books for our work are:</p>
|
|
|
|
<ol>
|
|
|
|
<li><a href="http://www.aw.com/product/0,2627,0201924889,00.html">Effective
|
|
C++</a> by Scott Meyers. There is an online version of the book (only some
|
|
chapters though) <a
|
|
href="http://www.awlonline.com/cseng/meyerscddemo/">available as well</a>. Also
|
|
interesting and useful are "More Effective C++" and "Effective STL" by the same
|
|
author.</li>
|
|
|
|
<li><a href="http://cseng.aw.com/book/0,3828,0201633620,00.html">Large-Scale C++
|
|
Software Design</a> by John Lakos</li>
|
|
|
|
</ol>
|
|
|
|
<p>If you get some free time, and you haven't read them: do so, you might learn
|
|
something. :)</p>
|
|
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
<hr>
|
|
<address>
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<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
|
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<a href="http://llvm.cs.uiuc.edu">LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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