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<h3>
Ben Gamari pushed to branch wip/T18854
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86380ed17f0d5b2bc0b9d40a9edd03c1c7bbde39">86380ed1</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-19T16:46:42-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document that ccall convention doesn't support varargs
We do not support foreign "C" imports of varargs functions. While this
works on amd64, in general the platform's calling convention may need
more type information that our Cmm representation can currently provide.
For instance, this is the case with Darwin's AArch64 calling convention.
Document this fact in the users guide and fix T5423 which makes use of a
disallowed foreign import.
Closes #18854.
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2">
docs/users_guide/exts/ffi.rst
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<li class="file-stats">
<a href="#be8623676f6c429829619e70a1657c7cee34fd9d">
testsuite/tests/rts/T5423.hs
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<li class="file-stats">
<a href="#8001835f2249b6c2ebfbd92eaca44e0dc453c07b">
testsuite/tests/rts/T5423_c.c
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<li class="file-stats">
<a href="#b334da64760d52260358313a63d8f59834859b08">
testsuite/tests/rts/T5423_cmm.cmm
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<h4>Changes:</h4>
<li id="f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86380ed17f0d5b2bc0b9d40a9edd03c1c7bbde39#f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2"><strong>docs/users_guide/exts/ffi.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -83,6 +83,21 @@ For more details on the implementation see the Paper:</td>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext">Last known to be accessible `here</span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext"><https://www.microsoft.com/en-us/research/wp-content/uploads/2004/09/conc-ffi.pdf>`_.</span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext">Varargs not supported by ``ccall`` calling convention</span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="plaintext">Note that functions requiring varargs arguments are unsupported by the ``ccall``</span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">calling convention. Foreign imports needing to call such functions should rather</span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext">use the ``capi`` convention, giving an explicit signature for the needed</span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="plaintext">call-pattern. For instance, one could write: ::</span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext"> foreign import "capi" "printf"</span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext"> my_printf :: Ptr CChar -> CInt -> IO ()</span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext"> printInt :: CInt -> IO ()</span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext"> printInt n = my_printf "printed number %d" n</span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext">.. _ffi-ghcexts:</span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext">GHC extensions to the FFI Chapter</span>
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<li id="be8623676f6c429829619e70a1657c7cee34fd9d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86380ed17f0d5b2bc0b9d40a9edd03c1c7bbde39#be8623676f6c429829619e70a1657c7cee34fd9d"><strong>testsuite/tests/rts/T5423.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cd">-- | Verify that @foreign import prim@ calls with more than 10 arguments</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are lowered correctly.</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash, GHCForeignImportPrim, UnliftedFFITypes #-}</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86380ed17f0d5b2bc0b9d40a9edd03c1c7bbde39#8001835f2249b6c2ebfbd92eaca44e0dc453c07b"><strong>testsuite/tests/rts/T5423_c.c</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <Rts.h></span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <stdio.h></span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">flush_stdout</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="c"> <span class="n" style="color: #333;">fflush</span><span class="p">(</span><span class="n" style="color: #333;">stdout</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">print_it</span><span class="p">(</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r1</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r2</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r3</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r4</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r5</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r6</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r7</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r8</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r9</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">r10</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="c"> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"%d %d %d %d %d %d %d %d %d %d</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="c"> <span class="n" style="color: #333;">r1</span><span class="p">,</span> <span class="n" style="color: #333;">r2</span><span class="p">,</span> <span class="n" style="color: #333;">r3</span><span class="p">,</span> <span class="n" style="color: #333;">r4</span><span class="p">,</span> <span class="n" style="color: #333;">r5</span><span class="p">,</span> <span class="n" style="color: #333;">r6</span><span class="p">,</span> <span class="n" style="color: #333;">r7</span><span class="p">,</span> <span class="n" style="color: #333;">r8</span><span class="p">,</span> <span class="n" style="color: #333;">r9</span><span class="p">,</span> <span class="n" style="color: #333;">r10</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="c"><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86380ed17f0d5b2bc0b9d40a9edd03c1c7bbde39#b334da64760d52260358313a63d8f59834859b08"><strong>testsuite/tests/rts/T5423_cmm.cmm</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -10,7 +10,6 @@ test (W_ r1,</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="ghc-cmm"> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">r9</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="ghc-cmm"> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">r10</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="ghc-cmm"> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">foreign</span> <span class="dl">"</span><span class="s" style="color: #d14;">C</span><span class="dl">"</span> <span class="nf" style="color: #900; font-weight: 600;">printf</span><span class="p">(</span><span class="dl">"</span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="s" style="color: #d14;"> </span><span class="ss" style="color: #990073;">%d</span><span class="se" style="color: #d14;">\n</span><span class="dl">"</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="ghc-cmm"> <span class="nl">r1</span><span class="p">,</span> <span class="nl">r2</span><span class="p">,</span> <span class="nl">r3</span><span class="p">,</span> <span class="nl">r4</span><span class="p">,</span> <span class="nl">r5</span><span class="p">,</span> <span class="nl">r6</span><span class="p">,</span> <span class="nl">r7</span><span class="p">,</span> <span class="nl">r8</span><span class="p">,</span> <span class="nl">r9</span><span class="p">,</span> <span class="nl">r10</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">foreign</span> <span class="dl">"</span><span class="s" style="color: #d14;">C</span><span class="dl">"</span> <span class="nf" style="color: #900; font-weight: 600;">test_it</span><span class="p">(</span><span class="nl">r1</span><span class="p">,</span> <span class="nl">r2</span><span class="p">,</span> <span class="nl">r3</span><span class="p">,</span> <span class="nl">r4</span><span class="p">,</span> <span class="nl">r5</span><span class="p">,</span> <span class="nl">r6</span><span class="p">,</span> <span class="nl">r7</span><span class="p">,</span> <span class="nl">r8</span><span class="p">,</span> <span class="nl">r9</span><span class="p">,</span> <span class="nl">r10</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">return</span> <span class="p">(</span><span class="nl">r10</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="ghc-cmm"> <span class="p">}</span></span></pre>
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