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667 lines
36 KiB
HTML
667 lines
36 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Label Output (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Label Output (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Label Output (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Assembler-Format.html#Assembler-Format" rel="up" title="Assembler Format">
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<link href="Initialization.html#Initialization" rel="next" title="Initialization">
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<link href="Uninitialized-Data.html#Uninitialized-Data" rel="prev" title="Uninitialized Data">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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</style>
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</head>
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<body lang="en">
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<a name="Label-Output"></a>
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<div class="header">
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<p>
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Next: <a href="Initialization.html#Initialization" accesskey="n" rel="next">Initialization</a>, Previous: <a href="Uninitialized-Data.html#Uninitialized-Data" accesskey="p" rel="prev">Uninitialized Data</a>, Up: <a href="Assembler-Format.html#Assembler-Format" accesskey="u" rel="up">Assembler Format</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>
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</div>
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<hr>
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<a name="Output-and-Generation-of-Labels"></a>
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<h4 class="subsection">18.20.4 Output and Generation of Labels</h4>
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<p>This is about outputting labels.
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</p>
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<a name="index-assemble_005fname"></a>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fLABEL"></a>Macro: <strong>ASM_OUTPUT_LABEL</strong> <em>(<var>stream</var>, <var>name</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> the assembler definition of a label named <var>name</var>.
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Use the expression <code>assemble_name (<var>stream</var>, <var>name</var>)</code> to
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output the name itself; before and after that, output the additional
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assembler syntax for defining the name, and a newline. A default
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definition of this macro is provided which is correct for most systems.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fFUNCTION_005fLABEL"></a>Macro: <strong>ASM_OUTPUT_FUNCTION_LABEL</strong> <em>(<var>stream</var>, <var>name</var>, <var>decl</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> the assembler definition of a label named <var>name</var> of
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a function.
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Use the expression <code>assemble_name (<var>stream</var>, <var>name</var>)</code> to
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output the name itself; before and after that, output the additional
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assembler syntax for defining the name, and a newline. A default
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definition of this macro is provided which is correct for most systems.
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</p>
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<p>If this macro is not defined, then the function name is defined in the
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usual manner as a label (by means of <code>ASM_OUTPUT_LABEL</code>).
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</p></dd></dl>
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<a name="index-assemble_005fname_005fraw"></a>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fINTERNAL_005fLABEL"></a>Macro: <strong>ASM_OUTPUT_INTERNAL_LABEL</strong> <em>(<var>stream</var>, <var>name</var>)</em></dt>
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<dd><p>Identical to <code>ASM_OUTPUT_LABEL</code>, except that <var>name</var> is known
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to refer to a compiler-generated label. The default definition uses
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<code>assemble_name_raw</code>, which is like <code>assemble_name</code> except
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that it is more efficient.
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</p></dd></dl>
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<dl>
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<dt><a name="index-SIZE_005fASM_005fOP"></a>Macro: <strong>SIZE_ASM_OP</strong></dt>
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<dd><p>A C string containing the appropriate assembler directive to specify the
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size of a symbol, without any arguments. On systems that use ELF, the
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default (in <samp>config/elfos.h</samp>) is ‘<samp>"\t.size\t"</samp>’; on other
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systems, the default is not to define this macro.
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</p>
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<p>Define this macro only if it is correct to use the default definitions
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of <code>ASM_OUTPUT_SIZE_DIRECTIVE</code> and <code>ASM_OUTPUT_MEASURED_SIZE</code>
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for your system. If you need your own custom definitions of those
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macros, or if you do not need explicit symbol sizes at all, do not
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define this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fSIZE_005fDIRECTIVE"></a>Macro: <strong>ASM_OUTPUT_SIZE_DIRECTIVE</strong> <em>(<var>stream</var>, <var>name</var>, <var>size</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> a directive telling the assembler that the size of the
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symbol <var>name</var> is <var>size</var>. <var>size</var> is a <code>HOST_WIDE_INT</code>.
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If you define <code>SIZE_ASM_OP</code>, a default definition of this macro is
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provided.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fMEASURED_005fSIZE"></a>Macro: <strong>ASM_OUTPUT_MEASURED_SIZE</strong> <em>(<var>stream</var>, <var>name</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> a directive telling the assembler to calculate the size of
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the symbol <var>name</var> by subtracting its address from the current
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address.
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</p>
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<p>If you define <code>SIZE_ASM_OP</code>, a default definition of this macro is
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provided. The default assumes that the assembler recognizes a special
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‘<samp>.</samp>’ symbol as referring to the current address, and can calculate
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the difference between this and another symbol. If your assembler does
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not recognize ‘<samp>.</samp>’ or cannot do calculations with it, you will need
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to redefine <code>ASM_OUTPUT_MEASURED_SIZE</code> to use some other technique.
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</p></dd></dl>
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<dl>
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<dt><a name="index-NO_005fDOLLAR_005fIN_005fLABEL"></a>Macro: <strong>NO_DOLLAR_IN_LABEL</strong></dt>
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<dd><p>Define this macro if the assembler does not accept the character
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‘<samp>$</samp>’ in label names. By default constructors and destructors in
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G++ have ‘<samp>$</samp>’ in the identifiers. If this macro is defined,
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‘<samp>.</samp>’ is used instead.
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</p></dd></dl>
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<dl>
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<dt><a name="index-NO_005fDOT_005fIN_005fLABEL"></a>Macro: <strong>NO_DOT_IN_LABEL</strong></dt>
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<dd><p>Define this macro if the assembler does not accept the character
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‘<samp>.</samp>’ in label names. By default constructors and destructors in G++
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have names that use ‘<samp>.</samp>’. If this macro is defined, these names
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are rewritten to avoid ‘<samp>.</samp>’.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TYPE_005fASM_005fOP"></a>Macro: <strong>TYPE_ASM_OP</strong></dt>
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<dd><p>A C string containing the appropriate assembler directive to specify the
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type of a symbol, without any arguments. On systems that use ELF, the
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default (in <samp>config/elfos.h</samp>) is ‘<samp>"\t.type\t"</samp>’; on other
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systems, the default is not to define this macro.
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</p>
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<p>Define this macro only if it is correct to use the default definition of
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<code>ASM_OUTPUT_TYPE_DIRECTIVE</code> for your system. If you need your own
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custom definition of this macro, or if you do not need explicit symbol
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types at all, do not define this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TYPE_005fOPERAND_005fFMT"></a>Macro: <strong>TYPE_OPERAND_FMT</strong></dt>
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<dd><p>A C string which specifies (using <code>printf</code> syntax) the format of
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the second operand to <code>TYPE_ASM_OP</code>. On systems that use ELF, the
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default (in <samp>config/elfos.h</samp>) is ‘<samp>"@%s"</samp>’; on other systems,
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the default is not to define this macro.
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</p>
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<p>Define this macro only if it is correct to use the default definition of
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<code>ASM_OUTPUT_TYPE_DIRECTIVE</code> for your system. If you need your own
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custom definition of this macro, or if you do not need explicit symbol
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types at all, do not define this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fTYPE_005fDIRECTIVE"></a>Macro: <strong>ASM_OUTPUT_TYPE_DIRECTIVE</strong> <em>(<var>stream</var>, <var>type</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> a directive telling the assembler that the type of the
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symbol <var>name</var> is <var>type</var>. <var>type</var> is a C string; currently,
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that string is always either ‘<samp>"function"</samp>’ or ‘<samp>"object"</samp>’, but
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you should not count on this.
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</p>
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<p>If you define <code>TYPE_ASM_OP</code> and <code>TYPE_OPERAND_FMT</code>, a default
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definition of this macro is provided.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fDECLARE_005fFUNCTION_005fNAME"></a>Macro: <strong>ASM_DECLARE_FUNCTION_NAME</strong> <em>(<var>stream</var>, <var>name</var>, <var>decl</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> any text necessary for declaring the name <var>name</var> of a
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function which is being defined. This macro is responsible for
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outputting the label definition (perhaps using
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<code>ASM_OUTPUT_FUNCTION_LABEL</code>). The argument <var>decl</var> is the
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<code>FUNCTION_DECL</code> tree node representing the function.
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</p>
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<p>If this macro is not defined, then the function name is defined in the
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usual manner as a label (by means of <code>ASM_OUTPUT_FUNCTION_LABEL</code>).
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</p>
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<p>You may wish to use <code>ASM_OUTPUT_TYPE_DIRECTIVE</code> in the definition
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of this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fDECLARE_005fFUNCTION_005fSIZE"></a>Macro: <strong>ASM_DECLARE_FUNCTION_SIZE</strong> <em>(<var>stream</var>, <var>name</var>, <var>decl</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> any text necessary for declaring the size of a function
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which is being defined. The argument <var>name</var> is the name of the
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function. The argument <var>decl</var> is the <code>FUNCTION_DECL</code> tree node
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representing the function.
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</p>
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<p>If this macro is not defined, then the function size is not defined.
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</p>
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<p>You may wish to use <code>ASM_OUTPUT_MEASURED_SIZE</code> in the definition
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of this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fDECLARE_005fCOLD_005fFUNCTION_005fNAME"></a>Macro: <strong>ASM_DECLARE_COLD_FUNCTION_NAME</strong> <em>(<var>stream</var>, <var>name</var>, <var>decl</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> any text necessary for declaring the name <var>name</var> of a
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cold function partition which is being defined. This macro is responsible
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for outputting the label definition (perhaps using
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<code>ASM_OUTPUT_FUNCTION_LABEL</code>). The argument <var>decl</var> is the
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<code>FUNCTION_DECL</code> tree node representing the function.
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</p>
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<p>If this macro is not defined, then the cold partition name is defined in the
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usual manner as a label (by means of <code>ASM_OUTPUT_LABEL</code>).
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</p>
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<p>You may wish to use <code>ASM_OUTPUT_TYPE_DIRECTIVE</code> in the definition
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of this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fDECLARE_005fCOLD_005fFUNCTION_005fSIZE"></a>Macro: <strong>ASM_DECLARE_COLD_FUNCTION_SIZE</strong> <em>(<var>stream</var>, <var>name</var>, <var>decl</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> any text necessary for declaring the size of a cold function
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partition which is being defined. The argument <var>name</var> is the name of the
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cold partition of the function. The argument <var>decl</var> is the
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<code>FUNCTION_DECL</code> tree node representing the function.
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</p>
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<p>If this macro is not defined, then the partition size is not defined.
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</p>
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<p>You may wish to use <code>ASM_OUTPUT_MEASURED_SIZE</code> in the definition
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of this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fDECLARE_005fOBJECT_005fNAME"></a>Macro: <strong>ASM_DECLARE_OBJECT_NAME</strong> <em>(<var>stream</var>, <var>name</var>, <var>decl</var>)</em></dt>
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<dd><p>A C statement (sans semicolon) to output to the stdio stream
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<var>stream</var> any text necessary for declaring the name <var>name</var> of an
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initialized variable which is being defined. This macro must output the
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label definition (perhaps using <code>ASM_OUTPUT_LABEL</code>). The argument
|
||
|
|
<var>decl</var> is the <code>VAR_DECL</code> tree node representing the variable.
|
||
|
|
</p>
|
||
|
|
<p>If this macro is not defined, then the variable name is defined in the
|
||
|
|
usual manner as a label (by means of <code>ASM_OUTPUT_LABEL</code>).
|
||
|
|
</p>
|
||
|
|
<p>You may wish to use <code>ASM_OUTPUT_TYPE_DIRECTIVE</code> and/or
|
||
|
|
<code>ASM_OUTPUT_SIZE_DIRECTIVE</code> in the definition of this macro.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fDECLARE_005fCONSTANT_005fNAME"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_DECLARE_CONSTANT_NAME</strong> <em>(FILE *<var>file</var>, const char *<var>name</var>, const_tree <var>expr</var>, HOST_WIDE_INT <var>size</var>)</em></dt>
|
||
|
|
<dd><p>A target hook to output to the stdio stream <var>file</var> any text necessary
|
||
|
|
for declaring the name <var>name</var> of a constant which is being defined. This
|
||
|
|
target hook is responsible for outputting the label definition (perhaps using
|
||
|
|
<code>assemble_label</code>). The argument <var>exp</var> is the value of the constant,
|
||
|
|
and <var>size</var> is the size of the constant in bytes. The <var>name</var>
|
||
|
|
will be an internal label.
|
||
|
|
</p>
|
||
|
|
<p>The default version of this target hook, define the <var>name</var> in the
|
||
|
|
usual manner as a label (by means of <code>assemble_label</code>).
|
||
|
|
</p>
|
||
|
|
<p>You may wish to use <code>ASM_OUTPUT_TYPE_DIRECTIVE</code> in this target hook.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fDECLARE_005fREGISTER_005fGLOBAL"></a>Macro: <strong>ASM_DECLARE_REGISTER_GLOBAL</strong> <em>(<var>stream</var>, <var>decl</var>, <var>regno</var>, <var>name</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to output to the stdio stream
|
||
|
|
<var>stream</var> any text necessary for claiming a register <var>regno</var>
|
||
|
|
for a global variable <var>decl</var> with name <var>name</var>.
|
||
|
|
</p>
|
||
|
|
<p>If you don’t define this macro, that is equivalent to defining it to do
|
||
|
|
nothing.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fFINISH_005fDECLARE_005fOBJECT"></a>Macro: <strong>ASM_FINISH_DECLARE_OBJECT</strong> <em>(<var>stream</var>, <var>decl</var>, <var>toplevel</var>, <var>atend</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to finish up declaring a variable name
|
||
|
|
once the compiler has processed its initializer fully and thus has had a
|
||
|
|
chance to determine the size of an array when controlled by an
|
||
|
|
initializer. This is used on systems where it’s necessary to declare
|
||
|
|
something about the size of the object.
|
||
|
|
</p>
|
||
|
|
<p>If you don’t define this macro, that is equivalent to defining it to do
|
||
|
|
nothing.
|
||
|
|
</p>
|
||
|
|
<p>You may wish to use <code>ASM_OUTPUT_SIZE_DIRECTIVE</code> and/or
|
||
|
|
<code>ASM_OUTPUT_MEASURED_SIZE</code> in the definition of this macro.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fGLOBALIZE_005fLABEL"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_GLOBALIZE_LABEL</strong> <em>(FILE *<var>stream</var>, const char *<var>name</var>)</em></dt>
|
||
|
|
<dd><p>This target hook is a function to output to the stdio stream
|
||
|
|
<var>stream</var> some commands that will make the label <var>name</var> global;
|
||
|
|
that is, available for reference from other files.
|
||
|
|
</p>
|
||
|
|
<p>The default implementation relies on a proper definition of
|
||
|
|
<code>GLOBAL_ASM_OP</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fGLOBALIZE_005fDECL_005fNAME"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_GLOBALIZE_DECL_NAME</strong> <em>(FILE *<var>stream</var>, tree <var>decl</var>)</em></dt>
|
||
|
|
<dd><p>This target hook is a function to output to the stdio stream
|
||
|
|
<var>stream</var> some commands that will make the name associated with <var>decl</var>
|
||
|
|
global; that is, available for reference from other files.
|
||
|
|
</p>
|
||
|
|
<p>The default implementation uses the TARGET_ASM_GLOBALIZE_LABEL target hook.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fASSEMBLE_005fUNDEFINED_005fDECL"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_ASSEMBLE_UNDEFINED_DECL</strong> <em>(FILE *<var>stream</var>, const char *<var>name</var>, const_tree <var>decl</var>)</em></dt>
|
||
|
|
<dd><p>This target hook is a function to output to the stdio stream
|
||
|
|
<var>stream</var> some commands that will declare the name associated with
|
||
|
|
<var>decl</var> which is not defined in the current translation unit. Most
|
||
|
|
assemblers do not require anything to be output in this case.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fWEAKEN_005fLABEL"></a>Macro: <strong>ASM_WEAKEN_LABEL</strong> <em>(<var>stream</var>, <var>name</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to output to the stdio stream
|
||
|
|
<var>stream</var> some commands that will make the label <var>name</var> weak;
|
||
|
|
that is, available for reference from other files but only used if
|
||
|
|
no other definition is available. Use the expression
|
||
|
|
<code>assemble_name (<var>stream</var>, <var>name</var>)</code> to output the name
|
||
|
|
itself; before and after that, output the additional assembler syntax
|
||
|
|
for making that name weak, and a newline.
|
||
|
|
</p>
|
||
|
|
<p>If you don’t define this macro or <code>ASM_WEAKEN_DECL</code>, GCC will not
|
||
|
|
support weak symbols and you should not define the <code>SUPPORTS_WEAK</code>
|
||
|
|
macro.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fWEAKEN_005fDECL"></a>Macro: <strong>ASM_WEAKEN_DECL</strong> <em>(<var>stream</var>, <var>decl</var>, <var>name</var>, <var>value</var>)</em></dt>
|
||
|
|
<dd><p>Combines (and replaces) the function of <code>ASM_WEAKEN_LABEL</code> and
|
||
|
|
<code>ASM_OUTPUT_WEAK_ALIAS</code>, allowing access to the associated function
|
||
|
|
or variable decl. If <var>value</var> is not <code>NULL</code>, this C statement
|
||
|
|
should output to the stdio stream <var>stream</var> assembler code which
|
||
|
|
defines (equates) the weak symbol <var>name</var> to have the value
|
||
|
|
<var>value</var>. If <var>value</var> is <code>NULL</code>, it should output commands
|
||
|
|
to make <var>name</var> weak.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fWEAKREF"></a>Macro: <strong>ASM_OUTPUT_WEAKREF</strong> <em>(<var>stream</var>, <var>decl</var>, <var>name</var>, <var>value</var>)</em></dt>
|
||
|
|
<dd><p>Outputs a directive that enables <var>name</var> to be used to refer to
|
||
|
|
symbol <var>value</var> with weak-symbol semantics. <code>decl</code> is the
|
||
|
|
declaration of <code>name</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-SUPPORTS_005fWEAK"></a>Macro: <strong>SUPPORTS_WEAK</strong></dt>
|
||
|
|
<dd><p>A preprocessor constant expression which evaluates to true if the target
|
||
|
|
supports weak symbols.
|
||
|
|
</p>
|
||
|
|
<p>If you don’t define this macro, <samp>defaults.h</samp> provides a default
|
||
|
|
definition. If either <code>ASM_WEAKEN_LABEL</code> or <code>ASM_WEAKEN_DECL</code>
|
||
|
|
is defined, the default definition is ‘<samp>1</samp>’; otherwise, it is ‘<samp>0</samp>’.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fSUPPORTS_005fWEAK"></a>Macro: <strong>TARGET_SUPPORTS_WEAK</strong></dt>
|
||
|
|
<dd><p>A C expression which evaluates to true if the target supports weak symbols.
|
||
|
|
</p>
|
||
|
|
<p>If you don’t define this macro, <samp>defaults.h</samp> provides a default
|
||
|
|
definition. The default definition is ‘<samp>(SUPPORTS_WEAK)</samp>’. Define
|
||
|
|
this macro if you want to control weak symbol support with a compiler
|
||
|
|
flag such as <samp>-melf</samp>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-MAKE_005fDECL_005fONE_005fONLY"></a>Macro: <strong>MAKE_DECL_ONE_ONLY</strong> <em>(<var>decl</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to mark <var>decl</var> to be emitted as a
|
||
|
|
public symbol such that extra copies in multiple translation units will
|
||
|
|
be discarded by the linker. Define this macro if your object file
|
||
|
|
format provides support for this concept, such as the ‘<samp>COMDAT</samp>’
|
||
|
|
section flags in the Microsoft Windows PE/COFF format, and this support
|
||
|
|
requires changes to <var>decl</var>, such as putting it in a separate section.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-SUPPORTS_005fONE_005fONLY"></a>Macro: <strong>SUPPORTS_ONE_ONLY</strong></dt>
|
||
|
|
<dd><p>A C expression which evaluates to true if the target supports one-only
|
||
|
|
semantics.
|
||
|
|
</p>
|
||
|
|
<p>If you don’t define this macro, <samp>varasm.c</samp> provides a default
|
||
|
|
definition. If <code>MAKE_DECL_ONE_ONLY</code> is defined, the default
|
||
|
|
definition is ‘<samp>1</samp>’; otherwise, it is ‘<samp>0</samp>’. Define this macro if
|
||
|
|
you want to control one-only symbol support with a compiler flag, or if
|
||
|
|
setting the <code>DECL_ONE_ONLY</code> flag is enough to mark a declaration to
|
||
|
|
be emitted as one-only.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fASSEMBLE_005fVISIBILITY"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_ASSEMBLE_VISIBILITY</strong> <em>(tree <var>decl</var>, int <var>visibility</var>)</em></dt>
|
||
|
|
<dd><p>This target hook is a function to output to <var>asm_out_file</var> some
|
||
|
|
commands that will make the symbol(s) associated with <var>decl</var> have
|
||
|
|
hidden, protected or internal visibility as specified by <var>visibility</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fWEAK_005fNOT_005fIN_005fARCHIVE_005fTOC"></a>Macro: <strong>TARGET_WEAK_NOT_IN_ARCHIVE_TOC</strong></dt>
|
||
|
|
<dd><p>A C expression that evaluates to true if the target’s linker expects
|
||
|
|
that weak symbols do not appear in a static archive’s table of contents.
|
||
|
|
The default is <code>0</code>.
|
||
|
|
</p>
|
||
|
|
<p>Leaving weak symbols out of an archive’s table of contents means that,
|
||
|
|
if a symbol will only have a definition in one translation unit and
|
||
|
|
will have undefined references from other translation units, that
|
||
|
|
symbol should not be weak. Defining this macro to be nonzero will
|
||
|
|
thus have the effect that certain symbols that would normally be weak
|
||
|
|
(explicit template instantiations, and vtables for polymorphic classes
|
||
|
|
with noninline key methods) will instead be nonweak.
|
||
|
|
</p>
|
||
|
|
<p>The C++ ABI requires this macro to be zero. Define this macro for
|
||
|
|
targets where full C++ ABI compliance is impossible and where linker
|
||
|
|
restrictions require weak symbols to be left out of a static archive’s
|
||
|
|
table of contents.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fEXTERNAL"></a>Macro: <strong>ASM_OUTPUT_EXTERNAL</strong> <em>(<var>stream</var>, <var>decl</var>, <var>name</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to output to the stdio stream
|
||
|
|
<var>stream</var> any text necessary for declaring the name of an external
|
||
|
|
symbol named <var>name</var> which is referenced in this compilation but
|
||
|
|
not defined. The value of <var>decl</var> is the tree node for the
|
||
|
|
declaration.
|
||
|
|
</p>
|
||
|
|
<p>This macro need not be defined if it does not need to output anything.
|
||
|
|
The GNU assembler and most Unix assemblers don’t require anything.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fEXTERNAL_005fLIBCALL"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_EXTERNAL_LIBCALL</strong> <em>(rtx <var>symref</var>)</em></dt>
|
||
|
|
<dd><p>This target hook is a function to output to <var>asm_out_file</var> an assembler
|
||
|
|
pseudo-op to declare a library function name external. The name of the
|
||
|
|
library function is given by <var>symref</var>, which is a <code>symbol_ref</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fMARK_005fDECL_005fPRESERVED"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_MARK_DECL_PRESERVED</strong> <em>(const char *<var>symbol</var>)</em></dt>
|
||
|
|
<dd><p>This target hook is a function to output to <var>asm_out_file</var> an assembler
|
||
|
|
directive to annotate <var>symbol</var> as used. The Darwin target uses the
|
||
|
|
.no_dead_code_strip directive.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fLABELREF"></a>Macro: <strong>ASM_OUTPUT_LABELREF</strong> <em>(<var>stream</var>, <var>name</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to output to the stdio stream
|
||
|
|
<var>stream</var> a reference in assembler syntax to a label named
|
||
|
|
<var>name</var>. This should add ‘<samp>_</samp>’ to the front of the name, if that
|
||
|
|
is customary on your operating system, as it is in most Berkeley Unix
|
||
|
|
systems. This macro is used in <code>assemble_name</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fMANGLE_005fASSEMBLER_005fNAME"></a>Target Hook: <em>tree</em> <strong>TARGET_MANGLE_ASSEMBLER_NAME</strong> <em>(const char *<var>name</var>)</em></dt>
|
||
|
|
<dd><p>Given a symbol <var>name</var>, perform same mangling as <code>varasm.c</code>’s <code>assemble_name</code>, but in memory rather than to a file stream, returning result as an <code>IDENTIFIER_NODE</code>. Required for correct LTO symtabs. The default implementation calls the <code>TARGET_STRIP_NAME_ENCODING</code> hook and then prepends the <code>USER_LABEL_PREFIX</code>, if any.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fSYMBOL_005fREF"></a>Macro: <strong>ASM_OUTPUT_SYMBOL_REF</strong> <em>(<var>stream</var>, <var>sym</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to output a reference to
|
||
|
|
<code>SYMBOL_REF</code> <var>sym</var>. If not defined, <code>assemble_name</code>
|
||
|
|
will be used to output the name of the symbol. This macro may be used
|
||
|
|
to modify the way a symbol is referenced depending on information
|
||
|
|
encoded by <code>TARGET_ENCODE_SECTION_INFO</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fLABEL_005fREF"></a>Macro: <strong>ASM_OUTPUT_LABEL_REF</strong> <em>(<var>stream</var>, <var>buf</var>)</em></dt>
|
||
|
|
<dd><p>A C statement (sans semicolon) to output a reference to <var>buf</var>, the
|
||
|
|
result of <code>ASM_GENERATE_INTERNAL_LABEL</code>. If not defined,
|
||
|
|
<code>assemble_name</code> will be used to output the name of the symbol.
|
||
|
|
This macro is not used by <code>output_asm_label</code>, or the <code>%l</code>
|
||
|
|
specifier that calls it; the intention is that this macro should be set
|
||
|
|
when it is necessary to output a label differently when its address is
|
||
|
|
being taken.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fINTERNAL_005fLABEL"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_INTERNAL_LABEL</strong> <em>(FILE *<var>stream</var>, const char *<var>prefix</var>, unsigned long <var>labelno</var>)</em></dt>
|
||
|
|
<dd><p>A function to output to the stdio stream <var>stream</var> a label whose
|
||
|
|
name is made from the string <var>prefix</var> and the number <var>labelno</var>.
|
||
|
|
</p>
|
||
|
|
<p>It is absolutely essential that these labels be distinct from the labels
|
||
|
|
used for user-level functions and variables. Otherwise, certain programs
|
||
|
|
will have name conflicts with internal labels.
|
||
|
|
</p>
|
||
|
|
<p>It is desirable to exclude internal labels from the symbol table of the
|
||
|
|
object file. Most assemblers have a naming convention for labels that
|
||
|
|
should be excluded; on many systems, the letter ‘<samp>L</samp>’ at the
|
||
|
|
beginning of a label has this effect. You should find out what
|
||
|
|
convention your system uses, and follow it.
|
||
|
|
</p>
|
||
|
|
<p>The default version of this function utilizes <code>ASM_GENERATE_INTERNAL_LABEL</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fDEBUG_005fLABEL"></a>Macro: <strong>ASM_OUTPUT_DEBUG_LABEL</strong> <em>(<var>stream</var>, <var>prefix</var>, <var>num</var>)</em></dt>
|
||
|
|
<dd><p>A C statement to output to the stdio stream <var>stream</var> a debug info
|
||
|
|
label whose name is made from the string <var>prefix</var> and the number
|
||
|
|
<var>num</var>. This is useful for VLIW targets, where debug info labels
|
||
|
|
may need to be treated differently than branch target labels. On some
|
||
|
|
systems, branch target labels must be at the beginning of instruction
|
||
|
|
bundles, but debug info labels can occur in the middle of instruction
|
||
|
|
bundles.
|
||
|
|
</p>
|
||
|
|
<p>If this macro is not defined, then <code>(*targetm.asm_out.internal_label)</code> will be
|
||
|
|
used.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fGENERATE_005fINTERNAL_005fLABEL"></a>Macro: <strong>ASM_GENERATE_INTERNAL_LABEL</strong> <em>(<var>string</var>, <var>prefix</var>, <var>num</var>)</em></dt>
|
||
|
|
<dd><p>A C statement to store into the string <var>string</var> a label whose name
|
||
|
|
is made from the string <var>prefix</var> and the number <var>num</var>.
|
||
|
|
</p>
|
||
|
|
<p>This string, when output subsequently by <code>assemble_name</code>, should
|
||
|
|
produce the output that <code>(*targetm.asm_out.internal_label)</code> would produce
|
||
|
|
with the same <var>prefix</var> and <var>num</var>.
|
||
|
|
</p>
|
||
|
|
<p>If the string begins with ‘<samp>*</samp>’, then <code>assemble_name</code> will
|
||
|
|
output the rest of the string unchanged. It is often convenient for
|
||
|
|
<code>ASM_GENERATE_INTERNAL_LABEL</code> to use ‘<samp>*</samp>’ in this way. If the
|
||
|
|
string doesn’t start with ‘<samp>*</samp>’, then <code>ASM_OUTPUT_LABELREF</code> gets
|
||
|
|
to output the string, and may change it. (Of course,
|
||
|
|
<code>ASM_OUTPUT_LABELREF</code> is also part of your machine description, so
|
||
|
|
you should know what it does on your machine.)
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fFORMAT_005fPRIVATE_005fNAME"></a>Macro: <strong>ASM_FORMAT_PRIVATE_NAME</strong> <em>(<var>outvar</var>, <var>name</var>, <var>number</var>)</em></dt>
|
||
|
|
<dd><p>A C expression to assign to <var>outvar</var> (which is a variable of type
|
||
|
|
<code>char *</code>) a newly allocated string made from the string
|
||
|
|
<var>name</var> and the number <var>number</var>, with some suitable punctuation
|
||
|
|
added. Use <code>alloca</code> to get space for the string.
|
||
|
|
</p>
|
||
|
|
<p>The string will be used as an argument to <code>ASM_OUTPUT_LABELREF</code> to
|
||
|
|
produce an assembler label for an internal static variable whose name is
|
||
|
|
<var>name</var>. Therefore, the string must be such as to result in valid
|
||
|
|
assembler code. The argument <var>number</var> is different each time this
|
||
|
|
macro is executed; it prevents conflicts between similarly-named
|
||
|
|
internal static variables in different scopes.
|
||
|
|
</p>
|
||
|
|
<p>Ideally this string should not be a valid C identifier, to prevent any
|
||
|
|
conflict with the user’s own symbols. Most assemblers allow periods
|
||
|
|
or percent signs in assembler symbols; putting at least one of these
|
||
|
|
between the name and the number will suffice.
|
||
|
|
</p>
|
||
|
|
<p>If this macro is not defined, a default definition will be provided
|
||
|
|
which is correct for most systems.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fDEF"></a>Macro: <strong>ASM_OUTPUT_DEF</strong> <em>(<var>stream</var>, <var>name</var>, <var>value</var>)</em></dt>
|
||
|
|
<dd><p>A C statement to output to the stdio stream <var>stream</var> assembler code
|
||
|
|
which defines (equates) the symbol <var>name</var> to have the value <var>value</var>.
|
||
|
|
</p>
|
||
|
|
<a name="index-SET_005fASM_005fOP"></a>
|
||
|
|
<p>If <code>SET_ASM_OP</code> is defined, a default definition is provided which is
|
||
|
|
correct for most systems.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fDEF_005fFROM_005fDECLS"></a>Macro: <strong>ASM_OUTPUT_DEF_FROM_DECLS</strong> <em>(<var>stream</var>, <var>decl_of_name</var>, <var>decl_of_value</var>)</em></dt>
|
||
|
|
<dd><p>A C statement to output to the stdio stream <var>stream</var> assembler code
|
||
|
|
which defines (equates) the symbol whose tree node is <var>decl_of_name</var>
|
||
|
|
to have the value of the tree node <var>decl_of_value</var>. This macro will
|
||
|
|
be used in preference to ‘<samp>ASM_OUTPUT_DEF</samp>’ if it is defined and if
|
||
|
|
the tree nodes are available.
|
||
|
|
</p>
|
||
|
|
<a name="index-SET_005fASM_005fOP-1"></a>
|
||
|
|
<p>If <code>SET_ASM_OP</code> is defined, a default definition is provided which is
|
||
|
|
correct for most systems.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fDEFERRED_005fOUTPUT_005fDEFS"></a>Macro: <strong>TARGET_DEFERRED_OUTPUT_DEFS</strong> <em>(<var>decl_of_name</var>, <var>decl_of_value</var>)</em></dt>
|
||
|
|
<dd><p>A C statement that evaluates to true if the assembler code which defines
|
||
|
|
(equates) the symbol whose tree node is <var>decl_of_name</var> to have the value
|
||
|
|
of the tree node <var>decl_of_value</var> should be emitted near the end of the
|
||
|
|
current compilation unit. The default is to not defer output of defines.
|
||
|
|
This macro affects defines output by ‘<samp>ASM_OUTPUT_DEF</samp>’ and
|
||
|
|
‘<samp>ASM_OUTPUT_DEF_FROM_DECLS</samp>’.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-ASM_005fOUTPUT_005fWEAK_005fALIAS"></a>Macro: <strong>ASM_OUTPUT_WEAK_ALIAS</strong> <em>(<var>stream</var>, <var>name</var>, <var>value</var>)</em></dt>
|
||
|
|
<dd><p>A C statement to output to the stdio stream <var>stream</var> assembler code
|
||
|
|
which defines (equates) the weak symbol <var>name</var> to have the value
|
||
|
|
<var>value</var>. If <var>value</var> is <code>NULL</code>, it defines <var>name</var> as
|
||
|
|
an undefined weak symbol.
|
||
|
|
</p>
|
||
|
|
<p>Define this macro if the target only supports weak aliases; define
|
||
|
|
<code>ASM_OUTPUT_DEF</code> instead if possible.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-OBJC_005fGEN_005fMETHOD_005fLABEL"></a>Macro: <strong>OBJC_GEN_METHOD_LABEL</strong> <em>(<var>buf</var>, <var>is_inst</var>, <var>class_name</var>, <var>cat_name</var>, <var>sel_name</var>)</em></dt>
|
||
|
|
<dd><p>Define this macro to override the default assembler names used for
|
||
|
|
Objective-C methods.
|
||
|
|
</p>
|
||
|
|
<p>The default name is a unique method number followed by the name of the
|
||
|
|
class (e.g. ‘<samp>_1_Foo</samp>’). For methods in categories, the name of
|
||
|
|
the category is also included in the assembler name (e.g.
|
||
|
|
‘<samp>_1_Foo_Bar</samp>’).
|
||
|
|
</p>
|
||
|
|
<p>These names are safe on most systems, but make debugging difficult since
|
||
|
|
the method’s selector is not present in the name. Therefore, particular
|
||
|
|
systems define other ways of computing names.
|
||
|
|
</p>
|
||
|
|
<p><var>buf</var> is an expression of type <code>char *</code> which gives you a
|
||
|
|
buffer in which to store the name; its length is as long as
|
||
|
|
<var>class_name</var>, <var>cat_name</var> and <var>sel_name</var> put together, plus
|
||
|
|
50 characters extra.
|
||
|
|
</p>
|
||
|
|
<p>The argument <var>is_inst</var> specifies whether the method is an instance
|
||
|
|
method or a class method; <var>class_name</var> is the name of the class;
|
||
|
|
<var>cat_name</var> is the name of the category (or <code>NULL</code> if the method is not
|
||
|
|
in a category); and <var>sel_name</var> is the name of the selector.
|
||
|
|
</p>
|
||
|
|
<p>On systems where the assembler can handle quoted names, you can use this
|
||
|
|
macro to provide more human-readable names.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Initialization.html#Initialization" accesskey="n" rel="next">Initialization</a>, Previous: <a href="Uninitialized-Data.html#Uninitialized-Data" accesskey="p" rel="prev">Uninitialized Data</a>, Up: <a href="Assembler-Format.html#Assembler-Format" accesskey="u" rel="up">Assembler Format</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>
|