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106 lines
7.5 KiB
HTML
106 lines
7.5 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Target Macros - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="Machine-Desc.html#Machine-Desc" title="Machine Desc">
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<link rel="next" href="Host-Config.html#Host-Config" title="Host Config">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1988-2015 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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<style type="text/css"><!--
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Target-Macros"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Host-Config.html#Host-Config">Host Config</a>,
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Previous: <a rel="previous" accesskey="p" href="Machine-Desc.html#Machine-Desc">Machine Desc</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="chapter">17 Target Description Macros and Functions</h2>
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<p><a name="index-machine-description-macros-3850"></a><a name="index-target-description-macros-3851"></a><a name="index-macros_002c-target-description-3852"></a><a name="index-g_t_0040file_007btm_002eh_007d-macros-3853"></a>
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In addition to the file <samp><var>machine</var><span class="file">.md</span></samp>, a machine description
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includes a C header file conventionally given the name
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<samp><var>machine</var><span class="file">.h</span></samp> and a C source file named <samp><var>machine</var><span class="file">.c</span></samp>.
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The header file defines numerous macros that convey the information
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about the target machine that does not fit into the scheme of the
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<samp><span class="file">.md</span></samp> file. The file <samp><span class="file">tm.h</span></samp> should be a link to
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<samp><var>machine</var><span class="file">.h</span></samp>. The header file <samp><span class="file">config.h</span></samp> includes
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<samp><span class="file">tm.h</span></samp> and most compiler source files include <samp><span class="file">config.h</span></samp>. The
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source file defines a variable <code>targetm</code>, which is a structure
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containing pointers to functions and data relating to the target
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machine. <samp><var>machine</var><span class="file">.c</span></samp> should also contain their definitions,
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if they are not defined elsewhere in GCC, and other functions called
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through the macros defined in the <samp><span class="file">.h</span></samp> file.
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<ul class="menu">
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<li><a accesskey="1" href="Target-Structure.html#Target-Structure">Target Structure</a>: The <code>targetm</code> variable.
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<li><a accesskey="2" href="Driver.html#Driver">Driver</a>: Controlling how the driver runs the compilation passes.
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<li><a accesskey="3" href="Run_002dtime-Target.html#Run_002dtime-Target">Run-time Target</a>: Defining ‘<samp><span class="samp">-m</span></samp>’ options like <samp><span class="option">-m68000</span></samp> and <samp><span class="option">-m68020</span></samp>.
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<li><a accesskey="4" href="Per_002dFunction-Data.html#Per_002dFunction-Data">Per-Function Data</a>: Defining data structures for per-function information.
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<li><a accesskey="5" href="Storage-Layout.html#Storage-Layout">Storage Layout</a>: Defining sizes and alignments of data.
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<li><a accesskey="6" href="Type-Layout.html#Type-Layout">Type Layout</a>: Defining sizes and properties of basic user data types.
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<li><a accesskey="7" href="Registers.html#Registers">Registers</a>: Naming and describing the hardware registers.
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<li><a accesskey="8" href="Register-Classes.html#Register-Classes">Register Classes</a>: Defining the classes of hardware registers.
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<li><a accesskey="9" href="Stack-and-Calling.html#Stack-and-Calling">Stack and Calling</a>: Defining which way the stack grows and by how much.
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<li><a href="Varargs.html#Varargs">Varargs</a>: Defining the varargs macros.
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<li><a href="Trampolines.html#Trampolines">Trampolines</a>: Code set up at run time to enter a nested function.
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<li><a href="Library-Calls.html#Library-Calls">Library Calls</a>: Controlling how library routines are implicitly called.
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<li><a href="Addressing-Modes.html#Addressing-Modes">Addressing Modes</a>: Defining addressing modes valid for memory operands.
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<li><a href="Anchored-Addresses.html#Anchored-Addresses">Anchored Addresses</a>: Defining how <samp><span class="option">-fsection-anchors</span></samp> should work.
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<li><a href="Condition-Code.html#Condition-Code">Condition Code</a>: Defining how insns update the condition code.
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<li><a href="Costs.html#Costs">Costs</a>: Defining relative costs of different operations.
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<li><a href="Scheduling.html#Scheduling">Scheduling</a>: Adjusting the behavior of the instruction scheduler.
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<li><a href="Sections.html#Sections">Sections</a>: Dividing storage into text, data, and other sections.
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<li><a href="PIC.html#PIC">PIC</a>: Macros for position independent code.
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<li><a href="Assembler-Format.html#Assembler-Format">Assembler Format</a>: Defining how to write insns and pseudo-ops to output.
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<li><a href="Debugging-Info.html#Debugging-Info">Debugging Info</a>: Defining the format of debugging output.
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<li><a href="Floating-Point.html#Floating-Point">Floating Point</a>: Handling floating point for cross-compilers.
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<li><a href="Mode-Switching.html#Mode-Switching">Mode Switching</a>: Insertion of mode-switching instructions.
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<li><a href="Target-Attributes.html#Target-Attributes">Target Attributes</a>: Defining target-specific uses of <code>__attribute__</code>.
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<li><a href="Emulated-TLS.html#Emulated-TLS">Emulated TLS</a>: Emulated TLS support.
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<li><a href="MIPS-Coprocessors.html#MIPS-Coprocessors">MIPS Coprocessors</a>: MIPS coprocessor support and how to customize it.
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<li><a href="PCH-Target.html#PCH-Target">PCH Target</a>: Validity checking for precompiled headers.
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<li><a href="C_002b_002b-ABI.html#C_002b_002b-ABI">C++ ABI</a>: Controlling C++ ABI changes.
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<li><a href="Named-Address-Spaces.html#Named-Address-Spaces">Named Address Spaces</a>: Adding support for named address spaces
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<li><a href="Misc.html#Misc">Misc</a>: Everything else.
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</ul>
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</body></html>
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