arrays-and-pointers-implementation.html

来自「自己收集的linux入门到学懂高级编程书集包括linux程序设计第三版」· HTML 代码 · 共 87 行

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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="Arrays%20and%20pointers%20implementation">Arrays and pointers implementation</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Hints-implementation.html#Hints%20implementation">Hints implementation</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Floating-point-implementation.html#Floating%20point%20implementation">Floating point implementation</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C-Implementation.html#C%20Implementation">C Implementation</a><hr><br></div><h3 class="section">Arrays and pointers</h3>     <ul><li><cite>The result of converting a pointer to an integer orvice versa (6.3.2.3).</cite>     <p>A cast from pointer to integer discards most-significant bits if thepointer representation is larger than the integer type,sign-extends<a rel="footnote" href="#fn-1"><sup>1</sup></a>if the pointer representation is smaller than the integer type, otherwisethe bits are unchanged.     <p>A cast from integer to pointer discards most-significant bits if thepointer representation is smaller than the integer type, extends accordingto the signedness of the integer type if the pointer representationis larger than the integer type, otherwise the bits are unchanged.     <p>When casting from pointer to integer and back again, the resultingpointer must reference the same object as the original pointer, otherwisethe behavior is undefined.  That is, one may not use integer arithmetic toavoid the undefined behavior of pointer arithmetic as proscribed in 6.5.6/8.     </p><li><cite>The size of the result of subtracting two pointers to elementsof the same array (6.5.6).</cite></ul>   <div class="footnote"><hr><h4>Footnotes</h4><ol type="1"><li><a name="fn-1"></a><p>Future versions of GCC may zero-extend, or usea target-defined <code>ptr_extend</code> pattern.  Do not rely on sign extension.</p>   </ol><hr></div>   </body></html>

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