| author | stechong |
| Wed, 20 Oct 2010 11:19:31 -0500 | |
| changeset 2165 | 2a7b5eccb0bc |
| parent 1641 | 2b3996fc09a1 |
| permissions | -rw-r--r-- |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><html> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> |
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<meta http-equiv="Content-Style-Type" content="text/css" /> |
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" /> |
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<title>Language-related strategies</title> |
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<link rel="StyleSheet" href="../../book.css" type="text/css"/> |
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</head> |
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<body bgcolor="#FFFFFF"> |
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<h3>Language-related Strategies</h3> |
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<p> Language-related strategies limit or avoid the use of ISO C++ features. While these features can make software design and maintenance easier, they can also increase code size.</p> |
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<ul> |
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<li>Virtual Functions—Not using virtual functions reduces code size.</li> |
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<li>Runtime Type Identification—Extra data is not generated if program does not use Runtime Type Identification (RTTI).</li> |
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<li>Exception Handling—While the Carbide.c++ compiler provides zero-overhead exception handling to provide optimum execution speed, it still generates extra object code for exception support.</li> |
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<li>Operator New—Do not throw an exception within the new operator.</li> |
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<li>Multiple and Virtual Inheritance</li> |
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</ul> |
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<h4>Virtual Functions</h4> |
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<p>For optimal code size, do not use virtual functions unless absolutely necessary. A virtual function is never dead-stripped, even if it is never called.</p> |
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<h4>Runtime Type Identification</h4> |
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<p>If code size is an issue, do not use RTTI because it generates a data table for every class. Disabling RTTI decreases the size of the data section.</p> |
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<p>The EC++ proposal does not allow runtime type identification.</p> |
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<p>See also “Controlling RTTI”.</p> |
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<h4>Exception Handling</h4> |
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<p>If you must handle exceptions, be careful when using C++ exception handling routines. Carbide has a zero runtime overhead error handling mechanism. However, using exceptions does increase code size, particularly the exception tables data.</p> |
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<p>The EC++ proposal does not allow exception handling.</p> |
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<p class="note"><strong>NOTE</strong> The proposed ISO standard libraries and the use of the new operator require exception handling.</p> |
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<h4>Operator New</h4> |
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<p>The C++ new operator might throw an exception, depending on how the runtime library implements the new operator. To make the new operator throw exceptions, set __throws_bad_alloc to 1 in the prefix file for your target and rebuild your library. To prevent the new operator from throwing exceptions, set __throws_bad_alloc to 0 in the prefix file for your target and rebuild your library.</p> |
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<p>See your release notes or Targeting manual for more information.</p> |
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<h4>Multiple and Virtual Inheritance</h4> |
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<p>Implementing multiple inheritance requires a modest amount of code and data overhead. The EC++ proposal does not allow multiple inheritance.</p> |
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<p>For optimal code size, do not use virtual inheritance. Virtual base classes are often complex and add a lot of code to the constructor and destructor functions.</p> |
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<p>The EC++ proposal does not allow virtual inheritance.</p> |
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<div id="footer">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
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</body> |
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</html> |