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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gccint/Function-Properties.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/gccint/Function-Properties.html b/share/doc/gccint/Function-Properties.html new file mode 100644 index 0000000..d2cb9f9 --- /dev/null +++ b/share/doc/gccint/Function-Properties.html @@ -0,0 +1,186 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>GNU Compiler Collection (GCC) Internals: Function Properties</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Function Properties"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Function Properties"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Functions.html#Functions" rel="up" title="Functions"> +<link href="Language_002ddependent-trees.html#Language_002ddependent-trees" rel="next" title="Language-dependent trees"> +<link href="Function-Basics.html#Function-Basics" rel="previous" title="Function Basics"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Function-Properties"></a> +<div class="header"> +<p> +Previous: <a href="Function-Basics.html#Function-Basics" accesskey="p" rel="previous">Function Basics</a>, Up: <a href="Functions.html#Functions" accesskey="u" rel="up">Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Function-Properties-1"></a> +<h4 class="subsection">11.8.2 Function Properties</h4> +<a name="index-function-properties"></a> +<a name="index-statements"></a> + +<p>To determine the scope of a function, you can use the +<code>DECL_CONTEXT</code> macro. This macro will return the class +(either a <code>RECORD_TYPE</code> or a <code>UNION_TYPE</code>) or namespace (a +<code>NAMESPACE_DECL</code>) of which the function is a member. For a virtual +function, this macro returns the class in which the function was +actually defined, not the base class in which the virtual declaration +occurred. +</p> +<p>In C, the <code>DECL_CONTEXT</code> for a function maybe another function. +This representation indicates that the GNU nested function extension +is in use. For details on the semantics of nested functions, see the +GCC Manual. The nested function can refer to local variables in its +containing function. Such references are not explicitly marked in the +tree structure; back ends must look at the <code>DECL_CONTEXT</code> for the +referenced <code>VAR_DECL</code>. If the <code>DECL_CONTEXT</code> for the +referenced <code>VAR_DECL</code> is not the same as the function currently +being processed, and neither <code>DECL_EXTERNAL</code> nor +<code>TREE_STATIC</code> hold, then the reference is to a local variable in +a containing function, and the back end must take appropriate action. +</p> +<dl compact="compact"> +<dt><code>DECL_EXTERNAL</code> +<a name="index-DECL_005fEXTERNAL-1"></a> +</dt> +<dd><p>This predicate holds if the function is undefined. +</p> +</dd> +<dt><code>TREE_PUBLIC</code> +<a name="index-TREE_005fPUBLIC-1"></a> +</dt> +<dd><p>This predicate holds if the function has external linkage. +</p> +</dd> +<dt><code>TREE_STATIC</code> +<a name="index-TREE_005fSTATIC"></a> +</dt> +<dd><p>This predicate holds if the function has been defined. +</p> +</dd> +<dt><code>TREE_THIS_VOLATILE</code> +<a name="index-TREE_005fTHIS_005fVOLATILE"></a> +</dt> +<dd><p>This predicate holds if the function does not return normally. +</p> +</dd> +<dt><code>TREE_READONLY</code> +<a name="index-TREE_005fREADONLY"></a> +</dt> +<dd><p>This predicate holds if the function can only read its arguments. +</p> +</dd> +<dt><code>DECL_PURE_P</code> +<a name="index-DECL_005fPURE_005fP"></a> +</dt> +<dd><p>This predicate holds if the function can only read its arguments, but +may also read global memory. +</p> +</dd> +<dt><code>DECL_VIRTUAL_P</code> +<a name="index-DECL_005fVIRTUAL_005fP"></a> +</dt> +<dd><p>This predicate holds if the function is virtual. +</p> +</dd> +<dt><code>DECL_ARTIFICIAL</code> +<a name="index-DECL_005fARTIFICIAL-2"></a> +</dt> +<dd><p>This macro holds if the function was implicitly generated by the +compiler, rather than explicitly declared. In addition to implicitly +generated class member functions, this macro holds for the special +functions created to implement static initialization and destruction, to +compute run-time type information, and so forth. +</p> +</dd> +<dt><code>DECL_FUNCTION_SPECIFIC_TARGET</code> +<a name="index-DECL_005fFUNCTION_005fSPECIFIC_005fTARGET-1"></a> +</dt> +<dd><p>This macro returns a tree node that holds the target options that are +to be used to compile this particular function or <code>NULL_TREE</code> if +the function is to be compiled with the target options specified on +the command line. +</p> +</dd> +<dt><code>DECL_FUNCTION_SPECIFIC_OPTIMIZATION</code> +<a name="index-DECL_005fFUNCTION_005fSPECIFIC_005fOPTIMIZATION-1"></a> +</dt> +<dd><p>This macro returns a tree node that holds the optimization options +that are to be used to compile this particular function or +<code>NULL_TREE</code> if the function is to be compiled with the +optimization options specified on the command line. +</p> +</dd> +</dl> + + +<hr> +<div class="header"> +<p> +Previous: <a href="Function-Basics.html#Function-Basics" accesskey="p" rel="previous">Function Basics</a>, Up: <a href="Functions.html#Functions" accesskey="u" rel="up">Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |