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Target-Macros.html

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  24. <title>GNU Compiler Collection (GCC) Internals: Target Macros</title>
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    71. 

  71. <a name="Target-Macros"></a>
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  72. <div class="header">
    73. 

  73. <p>
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  74. Next: <a href="Host-Config.html#Host-Config" accesskey="n" rel="next">Host Config</a>, Previous: <a href="Machine-Desc.html#Machine-Desc" accesskey="p" rel="prev">Machine Desc</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<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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    76. 

  76. <hr>
    77. 

  77. <a name="Target-Description-Macros-and-Functions"></a>
    78. 

  78. <h2 class="chapter">17 Target Description Macros and Functions</h2>
    79. 

  79. <a name="index-machine-description-macros"></a>
    80. 

  80. <a name="index-target-description-macros"></a>
    81. 

  81. <a name="index-macros_002c-target-description"></a>
    82. 

  82. <a name="index-tm_002eh-macros"></a>
    83. 

  83. 

  84. <p>In addition to the file <samp><var>machine</var>.md</samp>, a machine description
    85. 

  85. includes a C header file conventionally given the name
    86. 

  86. <samp><var>machine</var>.h</samp> and a C source file named <samp><var>machine</var>.c</samp>.
    87. 

  87. The header file defines numerous macros that convey the information
    88. 

  88. about the target machine that does not fit into the scheme of the
    89. 

  89. <samp>.md</samp> file.  The file <samp>tm.h</samp> should be a link to
    90. 

  90. <samp><var>machine</var>.h</samp>.  The header file <samp>config.h</samp> includes
    91. 

  91. <samp>tm.h</samp> and most compiler source files include <samp>config.h</samp>.  The
    92. 

  92. source file defines a variable <code>targetm</code>, which is a structure
    93. 

  93. containing pointers to functions and data relating to the target
    94. 

  94. machine.  <samp><var>machine</var>.c</samp> should also contain their definitions,
    95. 

  95. if they are not defined elsewhere in GCC, and other functions called
    96. 

  96. through the macros defined in the <samp>.h</samp> file.
    97. 

  97. </p>
    98. 

  98. <table class="menu" border="0" cellspacing="0">
    99. 

  99. <tr><td align="left" valign="top">&bull; <a href="Target-Structure.html#Target-Structure" accesskey="1">Target Structure</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">The <code>targetm</code> variable.
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  100. </td></tr>
    101. 

  101. <tr><td align="left" valign="top">&bull; <a href="Driver.html#Driver" accesskey="2">Driver</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Controlling how the driver runs the compilation passes.
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    104. 

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    106. 

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    108. 

  108. </td></tr>
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  109. <tr><td align="left" valign="top">&bull; <a href="Type-Layout.html#Type-Layout" accesskey="6">Type Layout</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining sizes and properties of basic user data types.
    110. 

  110. </td></tr>
    111. 

  111. <tr><td align="left" valign="top">&bull; <a href="Registers.html#Registers" accesskey="7">Registers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Naming and describing the hardware registers.
    112. 

  112. </td></tr>
    113. 

  113. <tr><td align="left" valign="top">&bull; <a href="Register-Classes.html#Register-Classes" accesskey="8">Register Classes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining the classes of hardware registers.
    114. 

  114. </td></tr>
    115. 

  115. <tr><td align="left" valign="top">&bull; <a href="Stack-and-Calling.html#Stack-and-Calling" accesskey="9">Stack and Calling</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining which way the stack grows and by how much.
    116. 

  116. </td></tr>
    117. 

  117. <tr><td align="left" valign="top">&bull; <a href="Varargs.html#Varargs">Varargs</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining the varargs macros.
    118. 

  118. </td></tr>
    119. 

  119. <tr><td align="left" valign="top">&bull; <a href="Trampolines.html#Trampolines">Trampolines</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Code set up at run time to enter a nested function.
    120. 

  120. </td></tr>
    121. 

  121. <tr><td align="left" valign="top">&bull; <a href="Library-Calls.html#Library-Calls">Library Calls</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Controlling how library routines are implicitly called.
    122. 

  122. </td></tr>
    123. 

  123. <tr><td align="left" valign="top">&bull; <a href="Addressing-Modes.html#Addressing-Modes">Addressing Modes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining addressing modes valid for memory operands.
    124. 

  124. </td></tr>
    125. 

  125. <tr><td align="left" valign="top">&bull; <a href="Anchored-Addresses.html#Anchored-Addresses">Anchored Addresses</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining how <samp>-fsection-anchors</samp> should work.
    126. 

  126. </td></tr>
    127. 

  127. <tr><td align="left" valign="top">&bull; <a href="Condition-Code.html#Condition-Code">Condition Code</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining how insns update the condition code.
    128. 

  128. </td></tr>
    129. 

  129. <tr><td align="left" valign="top">&bull; <a href="Costs.html#Costs">Costs</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining relative costs of different operations.
    130. 

  130. </td></tr>
    131. 

  131. <tr><td align="left" valign="top">&bull; <a href="Scheduling.html#Scheduling">Scheduling</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Adjusting the behavior of the instruction scheduler.
    132. 

  132. </td></tr>
    133. 

  133. <tr><td align="left" valign="top">&bull; <a href="Sections.html#Sections">Sections</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Dividing storage into text, data, and other sections.
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  134. </td></tr>
    135. 

  135. <tr><td align="left" valign="top">&bull; <a href="PIC.html#PIC">PIC</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Macros for position independent code.
    136. 

  136. </td></tr>
    137. 

  137. <tr><td align="left" valign="top">&bull; <a href="Assembler-Format.html#Assembler-Format">Assembler Format</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining how to write insns and pseudo-ops to output.
    138. 

  138. </td></tr>
    139. 

  139. <tr><td align="left" valign="top">&bull; <a href="Debugging-Info.html#Debugging-Info">Debugging Info</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining the format of debugging output.
    140. 

  140. </td></tr>
    141. 

  141. <tr><td align="left" valign="top">&bull; <a href="Floating-Point.html#Floating-Point">Floating Point</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Handling floating point for cross-compilers.
    142. 

  142. </td></tr>
    143. 

  143. <tr><td align="left" valign="top">&bull; <a href="Mode-Switching.html#Mode-Switching">Mode Switching</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Insertion of mode-switching instructions.
    144. 

  144. </td></tr>
    145. 

  145. <tr><td align="left" valign="top">&bull; <a href="Target-Attributes.html#Target-Attributes">Target Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Defining target-specific uses of <code>__attribute__</code>.
    146. 

  146. </td></tr>
    147. 

  147. <tr><td align="left" valign="top">&bull; <a href="Emulated-TLS.html#Emulated-TLS">Emulated TLS</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Emulated TLS support.
    148. 

  148. </td></tr>
    149. 

  149. <tr><td align="left" valign="top">&bull; <a href="MIPS-Coprocessors.html#MIPS-Coprocessors">MIPS Coprocessors</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">MIPS coprocessor support and how to customize it.
    150. 

  150. </td></tr>
    151. 

  151. <tr><td align="left" valign="top">&bull; <a href="PCH-Target.html#PCH-Target">PCH Target</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Validity checking for precompiled headers.
    152. 

  152. </td></tr>
    153. 

  153. <tr><td align="left" valign="top">&bull; <a href="C_002b_002b-ABI.html#C_002b_002b-ABI">C++ ABI</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Controlling C++ ABI changes.
    154. 

  154. </td></tr>
    155. 

  155. <tr><td align="left" valign="top">&bull; <a href="Named-Address-Spaces.html#Named-Address-Spaces">Named Address Spaces</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Adding support for named address spaces
    156. 

  156. </td></tr>
    157. 

  157. <tr><td align="left" valign="top">&bull; <a href="Misc.html#Misc">Misc</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Everything else.
    158. 

  158. </td></tr>
    159. 

  159. </table>
    160. 

  160. 

  161. <hr>
    162. 

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    163. 

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    164. 

  164. Next: <a href="Host-Config.html#Host-Config" accesskey="n" rel="next">Host Config</a>, Previous: <a href="Machine-Desc.html#Machine-Desc" accesskey="p" rel="prev">Machine Desc</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<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>
    165. 

  165. </div>
    166. 

  166. 

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  168. 

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    170. 

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    171.