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344 lines
18 KiB
HTML
344 lines
18 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>File Framework (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="File Framework (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="File Framework (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="Data-Output.html#Data-Output" rel="next" title="Data Output">
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<link href="Assembler-Format.html#Assembler-Format" rel="prev" title="Assembler Format">
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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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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</style>
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</head>
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<body lang="en">
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<a name="File-Framework"></a>
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<div class="header">
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<p>
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Next: <a href="Data-Output.html#Data-Output" accesskey="n" rel="next">Data Output</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="The-Overall-Framework-of-an-Assembler-File"></a>
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<h4 class="subsection">18.20.1 The Overall Framework of an Assembler File</h4>
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<a name="index-assembler-format"></a>
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<a name="index-output-of-assembler-code"></a>
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<p>This describes the overall framework of an assembly file.
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</p>
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<a name="index-default_005ffile_005fstart"></a>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fFILE_005fSTART"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_FILE_START</strong> <em>(void)</em></dt>
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<dd><p>Output to <code>asm_out_file</code> any text which the assembler expects to
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find at the beginning of a file. The default behavior is controlled
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by two flags, documented below. Unless your target’s assembler is
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quite unusual, if you override the default, you should call
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<code>default_file_start</code> at some point in your target hook. This
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lets other target files rely on these variables.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fFILE_005fSTART_005fAPP_005fOFF"></a>Target Hook: <em>bool</em> <strong>TARGET_ASM_FILE_START_APP_OFF</strong></dt>
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<dd><p>If this flag is true, the text of the macro <code>ASM_APP_OFF</code> will be
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printed as the very first line in the assembly file, unless
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<samp>-fverbose-asm</samp> is in effect. (If that macro has been defined
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to the empty string, this variable has no effect.) With the normal
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definition of <code>ASM_APP_OFF</code>, the effect is to notify the GNU
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assembler that it need not bother stripping comments or extra
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whitespace from its input. This allows it to work a bit faster.
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</p>
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<p>The default is false. You should not set it to true unless you have
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verified that your port does not generate any extra whitespace or
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comments that will cause GAS to issue errors in NO_APP mode.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fFILE_005fSTART_005fFILE_005fDIRECTIVE"></a>Target Hook: <em>bool</em> <strong>TARGET_ASM_FILE_START_FILE_DIRECTIVE</strong></dt>
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<dd><p>If this flag is true, <code>output_file_directive</code> will be called
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for the primary source file, immediately after printing
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<code>ASM_APP_OFF</code> (if that is enabled). Most ELF assemblers expect
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this to be done. The default is false.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fFILE_005fEND"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_FILE_END</strong> <em>(void)</em></dt>
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<dd><p>Output to <code>asm_out_file</code> any text which the assembler expects
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to find at the end of a file. The default is to output nothing.
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</p></dd></dl>
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<dl>
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<dt><a name="index-file_005fend_005findicate_005fexec_005fstack"></a>Function: <em>void</em> <strong>file_end_indicate_exec_stack</strong> <em>()</em></dt>
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<dd><p>Some systems use a common convention, the ‘<samp>.note.GNU-stack</samp>’
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special section, to indicate whether or not an object file relies on
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the stack being executable. If your system uses this convention, you
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should define <code>TARGET_ASM_FILE_END</code> to this function. If you
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need to do other things in that hook, have your hook function call
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this function.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fLTO_005fSTART"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_LTO_START</strong> <em>(void)</em></dt>
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<dd><p>Output to <code>asm_out_file</code> any text which the assembler expects
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to find at the start of an LTO section. The default is to output
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nothing.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fLTO_005fEND"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_LTO_END</strong> <em>(void)</em></dt>
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<dd><p>Output to <code>asm_out_file</code> any text which the assembler expects
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to find at the end of an LTO section. The default is to output
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nothing.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fCODE_005fEND"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_CODE_END</strong> <em>(void)</em></dt>
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<dd><p>Output to <code>asm_out_file</code> any text which is needed before emitting
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unwind info and debug info at the end of a file. Some targets emit
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here PIC setup thunks that cannot be emitted at the end of file,
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because they couldn’t have unwind info then. The default is to output
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nothing.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fCOMMENT_005fSTART"></a>Macro: <strong>ASM_COMMENT_START</strong></dt>
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<dd><p>A C string constant describing how to begin a comment in the target
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assembler language. The compiler assumes that the comment will end at
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the end of the line.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fAPP_005fON"></a>Macro: <strong>ASM_APP_ON</strong></dt>
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<dd><p>A C string constant for text to be output before each <code>asm</code>
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statement or group of consecutive ones. Normally this is
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<code>"#APP"</code>, which is a comment that has no effect on most
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assemblers but tells the GNU assembler that it must check the lines
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that follow for all valid assembler constructs.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fAPP_005fOFF"></a>Macro: <strong>ASM_APP_OFF</strong></dt>
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<dd><p>A C string constant for text to be output after each <code>asm</code>
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statement or group of consecutive ones. Normally this is
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<code>"#NO_APP"</code>, which tells the GNU assembler to resume making the
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time-saving assumptions that are valid for ordinary compiler output.
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</p></dd></dl>
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<dl>
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<dt><a name="index-ASM_005fOUTPUT_005fSOURCE_005fFILENAME"></a>Macro: <strong>ASM_OUTPUT_SOURCE_FILENAME</strong> <em>(<var>stream</var>, <var>name</var>)</em></dt>
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<dd><p>A C statement to output COFF information or DWARF debugging information
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which indicates that filename <var>name</var> is the current source file to
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the stdio stream <var>stream</var>.
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</p>
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<p>This macro need not be defined if the standard form of output
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for the file format in use is appropriate.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fOUTPUT_005fSOURCE_005fFILENAME"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_OUTPUT_SOURCE_FILENAME</strong> <em>(FILE *<var>file</var>, const char *<var>name</var>)</em></dt>
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<dd><p>Output DWARF debugging information which indicates that filename <var>name</var> is the current source file to the stdio stream <var>file</var>.
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</p>
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<p>This target hook need not be defined if the standard form of output for the file format in use is appropriate.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fOUTPUT_005fIDENT"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_OUTPUT_IDENT</strong> <em>(const char *<var>name</var>)</em></dt>
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<dd><p>Output a string based on <var>name</var>, suitable for the ‘<samp>#ident</samp>’ directive, or the equivalent directive or pragma in non-C-family languages. If this hook is not defined, nothing is output for the ‘<samp>#ident</samp>’ directive.
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</p></dd></dl>
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<dl>
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<dt><a name="index-OUTPUT_005fQUOTED_005fSTRING"></a>Macro: <strong>OUTPUT_QUOTED_STRING</strong> <em>(<var>stream</var>, <var>string</var>)</em></dt>
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<dd><p>A C statement to output the string <var>string</var> to the stdio stream
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<var>stream</var>. If you do not call the function <code>output_quoted_string</code>
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in your config files, GCC will only call it to output filenames to
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the assembler source. So you can use it to canonicalize the format
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of the filename using this macro.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fNAMED_005fSECTION"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_NAMED_SECTION</strong> <em>(const char *<var>name</var>, unsigned int <var>flags</var>, tree <var>decl</var>)</em></dt>
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<dd><p>Output assembly directives to switch to section <var>name</var>. The section
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should have attributes as specified by <var>flags</var>, which is a bit mask
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of the <code>SECTION_*</code> flags defined in <samp>output.h</samp>. If <var>decl</var>
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is non-NULL, it is the <code>VAR_DECL</code> or <code>FUNCTION_DECL</code> with which
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this section is associated.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fELF_005fFLAGS_005fNUMERIC"></a>Target Hook: <em>bool</em> <strong>TARGET_ASM_ELF_FLAGS_NUMERIC</strong> <em>(unsigned int <var>flags</var>, unsigned int *<var>num</var>)</em></dt>
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<dd><p>This hook can be used to encode ELF section flags for which no letter
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code has been defined in the assembler. It is called by
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<code>default_asm_named_section</code> whenever the section flags need to be
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emitted in the assembler output. If the hook returns true, then the
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numerical value for ELF section flags should be calculated from
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<var>flags</var> and saved in <var>*num</var>; the value is printed out instead of the
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normal sequence of letter codes. If the hook is not defined, or if it
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returns false, then <var>num</var> is ignored and the traditional letter sequence
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is emitted.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fFUNCTION_005fSECTION"></a>Target Hook: <em>section *</em> <strong>TARGET_ASM_FUNCTION_SECTION</strong> <em>(tree <var>decl</var>, enum node_frequency <var>freq</var>, bool <var>startup</var>, bool <var>exit</var>)</em></dt>
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<dd><p>Return preferred text (sub)section for function <var>decl</var>.
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Main purpose of this function is to separate cold, normal and hot
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functions. <var>startup</var> is true when function is known to be used only
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at startup (from static constructors or it is <code>main()</code>).
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<var>exit</var> is true when function is known to be used only at exit
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(from static destructors).
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Return NULL if function should go to default text section.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fASM_005fFUNCTION_005fSWITCHED_005fTEXT_005fSECTIONS"></a>Target Hook: <em>void</em> <strong>TARGET_ASM_FUNCTION_SWITCHED_TEXT_SECTIONS</strong> <em>(FILE *<var>file</var>, tree <var>decl</var>, bool <var>new_is_cold</var>)</em></dt>
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<dd><p>Used by the target to emit any assembler directives or additional labels needed when a function is partitioned between different sections. Output should be written to <var>file</var>. The function decl is available as <var>decl</var> and the new section is ‘cold’ if <var>new_is_cold</var> is <code>true</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fHAVE_005fNAMED_005fSECTIONS"></a>Common Target Hook: <em>bool</em> <strong>TARGET_HAVE_NAMED_SECTIONS</strong></dt>
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<dd><p>This flag is true if the target supports <code>TARGET_ASM_NAMED_SECTION</code>.
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It must not be modified by command-line option processing.
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</p></dd></dl>
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<a name="TARGET_005fHAVE_005fSWITCHABLE_005fBSS_005fSECTIONS"></a><dl>
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<dt><a name="index-TARGET_005fHAVE_005fSWITCHABLE_005fBSS_005fSECTIONS"></a>Target Hook: <em>bool</em> <strong>TARGET_HAVE_SWITCHABLE_BSS_SECTIONS</strong></dt>
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<dd><p>This flag is true if we can create zeroed data by switching to a BSS
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section and then using <code>ASM_OUTPUT_SKIP</code> to allocate the space.
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This is true on most ELF targets.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fSECTION_005fTYPE_005fFLAGS"></a>Target Hook: <em>unsigned int</em> <strong>TARGET_SECTION_TYPE_FLAGS</strong> <em>(tree <var>decl</var>, const char *<var>name</var>, int <var>reloc</var>)</em></dt>
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<dd><p>Choose a set of section attributes for use by <code>TARGET_ASM_NAMED_SECTION</code>
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based on a variable or function decl, a section name, and whether or not the
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declaration’s initializer may contain runtime relocations. <var>decl</var> may be
|
||
|
|
null, in which case read-write data should be assumed.
|
||
|
|
</p>
|
||
|
|
<p>The default version of this function handles choosing code vs data,
|
||
|
|
read-only vs read-write data, and <code>flag_pic</code>. You should only
|
||
|
|
need to override this if your target has special flags that might be
|
||
|
|
set via <code>__attribute__</code>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fRECORD_005fGCC_005fSWITCHES"></a>Target Hook: <em>int</em> <strong>TARGET_ASM_RECORD_GCC_SWITCHES</strong> <em>(print_switch_type <var>type</var>, const char *<var>text</var>)</em></dt>
|
||
|
|
<dd><p>Provides the target with the ability to record the gcc command line
|
||
|
|
switches that have been passed to the compiler, and options that are
|
||
|
|
enabled. The <var>type</var> argument specifies what is being recorded.
|
||
|
|
It can take the following values:
|
||
|
|
</p>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><code>SWITCH_TYPE_PASSED</code></dt>
|
||
|
|
<dd><p><var>text</var> is a command line switch that has been set by the user.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>SWITCH_TYPE_ENABLED</code></dt>
|
||
|
|
<dd><p><var>text</var> is an option which has been enabled. This might be as a
|
||
|
|
direct result of a command line switch, or because it is enabled by
|
||
|
|
default or because it has been enabled as a side effect of a different
|
||
|
|
command line switch. For example, the <samp>-O2</samp> switch enables
|
||
|
|
various different individual optimization passes.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>SWITCH_TYPE_DESCRIPTIVE</code></dt>
|
||
|
|
<dd><p><var>text</var> is either NULL or some descriptive text which should be
|
||
|
|
ignored. If <var>text</var> is NULL then it is being used to warn the
|
||
|
|
target hook that either recording is starting or ending. The first
|
||
|
|
time <var>type</var> is SWITCH_TYPE_DESCRIPTIVE and <var>text</var> is NULL, the
|
||
|
|
warning is for start up and the second time the warning is for
|
||
|
|
wind down. This feature is to allow the target hook to make any
|
||
|
|
necessary preparations before it starts to record switches and to
|
||
|
|
perform any necessary tidying up after it has finished recording
|
||
|
|
switches.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>SWITCH_TYPE_LINE_START</code></dt>
|
||
|
|
<dd><p>This option can be ignored by this target hook.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>SWITCH_TYPE_LINE_END</code></dt>
|
||
|
|
<dd><p>This option can be ignored by this target hook.
|
||
|
|
</p></dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>The hook’s return value must be zero. Other return values may be
|
||
|
|
supported in the future.
|
||
|
|
</p>
|
||
|
|
<p>By default this hook is set to NULL, but an example implementation is
|
||
|
|
provided for ELF based targets. Called <var>elf_record_gcc_switches</var>,
|
||
|
|
it records the switches as ASCII text inside a new, string mergeable
|
||
|
|
section in the assembler output file. The name of the new section is
|
||
|
|
provided by the <code>TARGET_ASM_RECORD_GCC_SWITCHES_SECTION</code> target
|
||
|
|
hook.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-TARGET_005fASM_005fRECORD_005fGCC_005fSWITCHES_005fSECTION"></a>Target Hook: <em>const char *</em> <strong>TARGET_ASM_RECORD_GCC_SWITCHES_SECTION</strong></dt>
|
||
|
|
<dd><p>This is the name of the section that will be created by the example
|
||
|
|
ELF implementation of the <code>TARGET_ASM_RECORD_GCC_SWITCHES</code> target
|
||
|
|
hook.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Data-Output.html#Data-Output" accesskey="n" rel="next">Data Output</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>
|