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108 lines
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108 lines
5.2 KiB
HTML
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<title>Host Common - GNU Compiler Collection (GCC) Internals</title>
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<link rel="up" href="Host-Config.html#Host-Config" title="Host Config">
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<link rel="next" href="Filesystem.html#Filesystem" title="Filesystem">
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A GNU Manual
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<div class="node">
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<a name="Host-Common"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Filesystem.html#Filesystem">Filesystem</a>,
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Up: <a rel="up" accesskey="u" href="Host-Config.html#Host-Config">Host Config</a>
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<hr>
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</div>
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<h3 class="section">18.1 Host Common</h3>
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<p><a name="index-host-hooks-5022"></a><a name="index-host-functions-5023"></a>
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Some things are just not portable, even between similar operating systems,
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and are too difficult for autoconf to detect. They get implemented using
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hook functions in the file specified by the <var>host_hook_obj</var>
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variable in <samp><span class="file">config.gcc</span></samp>.
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<div class="defun">
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— Host Hook: void <b>HOST_HOOKS_EXTRA_SIGNALS</b> (<var>void</var>)<var><a name="index-HOST_005fHOOKS_005fEXTRA_005fSIGNALS-5024"></a></var><br>
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<blockquote><p>This host hook is used to set up handling for extra signals. The most
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common thing to do in this hook is to detect stack overflow.
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</p></blockquote></div>
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<div class="defun">
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— Host Hook: void * <b>HOST_HOOKS_GT_PCH_GET_ADDRESS</b> (<var>size_t size, int fd</var>)<var><a name="index-HOST_005fHOOKS_005fGT_005fPCH_005fGET_005fADDRESS-5025"></a></var><br>
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<blockquote><p>This host hook returns the address of some space that is likely to be
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free in some subsequent invocation of the compiler. We intend to load
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the PCH data at this address such that the data need not be relocated.
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The area should be able to hold <var>size</var> bytes. If the host uses
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<code>mmap</code>, <var>fd</var> is an open file descriptor that can be used for
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probing.
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</p></blockquote></div>
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<div class="defun">
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— Host Hook: int <b>HOST_HOOKS_GT_PCH_USE_ADDRESS</b> (<var>void * address, size_t size, int fd, size_t offset</var>)<var><a name="index-HOST_005fHOOKS_005fGT_005fPCH_005fUSE_005fADDRESS-5026"></a></var><br>
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<blockquote><p>This host hook is called when a PCH file is about to be loaded.
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We want to load <var>size</var> bytes from <var>fd</var> at <var>offset</var>
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into memory at <var>address</var>. The given address will be the result of
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a previous invocation of <code>HOST_HOOKS_GT_PCH_GET_ADDRESS</code>.
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Return −1 if we couldn't allocate <var>size</var> bytes at <var>address</var>.
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Return 0 if the memory is allocated but the data is not loaded. Return 1
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if the hook has performed everything.
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<p>If the implementation uses reserved address space, free any reserved
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space beyond <var>size</var>, regardless of the return value. If no PCH will
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be loaded, this hook may be called with <var>size</var> zero, in which case
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all reserved address space should be freed.
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<p>Do not try to handle values of <var>address</var> that could not have been
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returned by this executable; just return −1. Such values usually
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indicate an out-of-date PCH file (built by some other GCC executable),
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and such a PCH file won't work.
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</p></blockquote></div>
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<div class="defun">
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— Host Hook: size_t <b>HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY</b> (<var>void</var>)<var>;<a name="index-HOST_005fHOOKS_005fGT_005fPCH_005fALLOC_005fGRANULARITY-5027"></a></var><br>
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<blockquote><p>This host hook returns the alignment required for allocating virtual
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memory. Usually this is the same as getpagesize, but on some hosts the
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alignment for reserving memory differs from the pagesize for committing
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memory.
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</p></blockquote></div>
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</body></html>
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