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<h3>
Peter Trommler pushed to branch wip/T15933
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1">b71eb384</a></strong>
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<span>by Peter Trommler</span>
<i>at 2020-06-12T17:36:07+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FFI: Fix pass small ints in foreign call wrappers
The Haskell calling convention requires integer parameters smaller
than wordsize to be promoted to wordsize (where the upper bits are
don't care). To access such small integer parameter read a word from
the parameter array and then cast that word to the small integer
target type.
Fixes #15933
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<h4>8 changed files:</h4>
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<a href="#9f0ddacf1490a1a7356d3b8c1b8506b1a8bc6ad4">
compiler/GHC/HsToCore/Foreign/Decl.hs
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<li class="file-stats">
<a href="#e18aab7fcc134a71d91f9d26e33b5110a3917e44">
compiler/GHC/StgToCmm/Foreign.hs
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<a href="#9ce49a73f669d8d499adf805a75b0029aca84a49">
testsuite/tests/ffi/should_run/Makefile
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testsuite/tests/ffi/should_run/T15933.h
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testsuite/tests/ffi/should_run/T15933.hs
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testsuite/tests/ffi/should_run/T15933.stdout
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testsuite/tests/ffi/should_run/T15933_c.c
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<li class="file-stats">
<a href="#fbea9a6392407b0fa9ede5b9aa0bb2445af9de4b">
testsuite/tests/ffi/should_run/all.T
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<h4>Changes:</h4>
<li id="9f0ddacf1490a1a7356d3b8c1b8506b1a8bc6ad4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#9f0ddacf1490a1a7356d3b8c1b8506b1a8bc6ad4"><strong>compiler/GHC/HsToCore/Foreign/Decl.hs</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">@@ -533,15 +533,36 @@ mkFExportCBits dflags c_nm maybe_target arg_htys res_hty is_IO_res_ty cc</td>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- C type</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Haskell type</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmType</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- the CmmType</span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">stg_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showStgType</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_cname</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">stg_type</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">stg_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showStgType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"> <span class="n" style="color: #333;">cmm_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeCmmType</span> <span class="n" style="color: #333;">platform</span> <span class="p">(</span><span class="n" style="color: #333;">getPrimTyOf</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"> <span class="n" style="color: #333;">stack_type</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">int_promote</span> <span class="p">(</span><span class="n" style="color: #333;">typeTyCon</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HsWord"</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">stg_type</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_cname</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">stg_type</span> <span class="n" style="color: #333;">stack_type</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="n" style="color: #333;">stg_type</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">typeCmmType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">platform</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">getPrimTyOf</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">cmm_type</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span><span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">arg_htys</span> <span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">::</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">..</span><span class="p">]</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_cname</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">stg_ty</span></span>
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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">libffi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'*'</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">stg_ty</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'*'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"> <span class="n" style="color: #333;">int_promote</span> <span class="n" style="color: #333;">ty_con</span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty_con</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">int8TyConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty_con</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">int16TyConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty_con</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">int32TyConKey</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">platformWordSizeInBytes</span> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">4</span></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty_con</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">word8TyConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty_con</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">word16TyConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty_con</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">word32TyConKey</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">platformWordSizeInBytes</span> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">4</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_cname</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">stg_ty</span> <span class="n" style="color: #333;">stack_ty</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">libffi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">stg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'*'</span> <span class="o" style="font-weight: 600;"><></span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">stack_ty</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'*'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span></span>
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566
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"args"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">brackets</span> <span class="p">(</span><span class="n" style="color: #333;">int</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">))</span></span>
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567
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="sc" style="color: #d14;">'a'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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568
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#e18aab7fcc134a71d91f9d26e33b5110a3917e44"><strong>compiler/GHC/StgToCmm/Foreign.hs</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">@@ -74,6 +74,7 @@ cgForeignCall (CCall (CCallSpec target cconv safety)) typ stg_args res_ty</td>
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74
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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75
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo: this might not be correct for 64-bit API</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is correct for the PowerPC ELF ABI version 1 and 2.</span></span>
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78
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_size</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">max</span> <span class="p">(</span><span class="n" style="color: #333;">widthInBytes</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">typeWidth</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cmmExprType</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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79
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">platformWordSizeInBytes</span> <span class="n" style="color: #333;">platform</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cmm_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFCallArgs</span> <span class="n" style="color: #333;">stg_args</span> <span class="n" style="color: #333;">typ</span></span>
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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">@@ -634,4 +635,3 @@ typeToStgFArgType typ</td>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a type in a foreign function signature with a representationally</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equivalent newtype.</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="n" style="color: #333;">tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConAppTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">unwrapType</span> <span class="n" style="color: #333;">typ</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#9ce49a73f669d8d499adf805a75b0029aca84a49"><strong>testsuite/tests/ffi/should_run/Makefile</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">@@ -43,3 +43,9 @@ Capi_Ctype_002:</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="make"> <span class="s1" style="color: #d14;">'</span><span class="nv" style="color: #008080;">$(TEST_HC)</span><span class="s1" style="color: #d14;">'</span> <span class="nv" style="color: #008080;">$(TEST_HC_OPTS)</span> Capi_Ctype_A_002.o Capi_Ctype_002.o <span class="nt" style="color: #000080;">-o</span> Capi_Ctype_002</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="make"> ./Capi_Ctype_002</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="make"></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="make"><span class="nl">.PHONY</span><span class="o" style="font-weight: 600;">:</span> <span class="nf" style="color: #900; font-weight: 600;">T15933</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="make"><span class="nl">T15933</span><span class="o" style="font-weight: 600;">:</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="make"> <span class="s1" style="color: #d14;">'</span><span class="nv" style="color: #008080;">$(TEST_HC)</span><span class="s1" style="color: #d14;">'</span> <span class="nv" style="color: #008080;">$(TEST_HC_OPTS)</span> <span class="nt" style="color: #000080;">-c</span> T15933_c.c</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="make"> <span class="s1" style="color: #d14;">'</span><span class="nv" style="color: #008080;">$(TEST_HC)</span><span class="s1" style="color: #d14;">'</span> <span class="nv" style="color: #008080;">$(TEST_HC_OPTS)</span> <span class="nt" style="color: #000080;">-c</span> T15933.hs</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="make"> <span class="s1" style="color: #d14;">'</span><span class="nv" style="color: #008080;">$(TEST_HC)</span><span class="s1" style="color: #d14;">'</span> <span class="nv" style="color: #008080;">$(TEST_HC_OPTS)</span> T15933_c.o T15933.o <span class="nt" style="color: #000080;">-o</span> T15933</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="make"> ./T15933</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#c7caae4a302acc613b9c69333de0e0fb09bbd53e"><strong>testsuite/tests/ffi/should_run/T15933.h</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="k" style="font-weight: 600;">typedef</span> <span class="nf" style="color: #900; font-weight: 600;">void</span><span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">hs_callback</span><span class="p">)(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">x</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">function_in_c</span><span class="p">(</span><span class="n" style="color: #333;">hs_callback</span> <span class="n" style="color: #333;">cb</span><span class="p">);</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#e28996b7b6858811d6e55316ec4cd8b16018503a"><strong>testsuite/tests/ffi/should_run/T15933.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span><span class="p">(</span><span class="n" style="color: #333;">main</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">HsCallback</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"T15933.h function_in_c"</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">functionInC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="kt" style="color: #458; font-weight: 600;">HsCallback</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"wrapper"</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsCallback</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="kt" style="color: #458; font-weight: 600;">HsCallback</span><span class="p">)</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">print</span> <span class="n" style="color: #333;">x</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">functionInC</span> <span class="n" style="color: #333;">f</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="n" style="color: #333;">freeHaskellFunPtr</span> <span class="n" style="color: #333;">f</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#7ce156f6f0987dbb2ce9bc185f17d2354ec5de3b"><strong>testsuite/tests/ffi/should_run/T15933.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">10</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#1018f8075341843147d0e311ed8508b5ede00273"><strong>testsuite/tests/ffi/should_run/T15933_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 "T15933.h"</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">function_in_c</span><span class="p">(</span><span class="n" style="color: #333;">hs_callback</span> <span class="n" style="color: #333;">cb</span><span class="p">)</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="p">{</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">10</span><span class="p">;</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"> <span class="n" style="color: #333;">cb</span><span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">);</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b71eb384dae5830b9266e02e0e4a1c10497062d1#fbea9a6392407b0fa9ede5b9aa0bb2445af9de4b"><strong>testsuite/tests/ffi/should_run/all.T</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">@@ -194,6 +194,8 @@ test('T12134', [omit_ways(['ghci'])], compile_and_run, ['T12134_c.c'])</td>
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194
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194
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="perl"></span>
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195
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195
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12614</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">omit_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghci</span><span class="p">'])],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T12614_c.c</span><span class="p">'])</span></span>
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196
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196
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="perl"></span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15933</span><span class="p">',</span> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">T15933_c.c</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">T15933.h</span><span class="p">']),</span> <span class="nv" style="color: #008080;">makefile_test</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T15933</span><span class="p">'])</span></span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="perl"></span>
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197
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16650a</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">omit_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghci</span><span class="p">'])],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T16650a_c.c</span><span class="p">'])</span></span>
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198
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="perl"></span>
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199
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16650b</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">omit_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghci</span><span class="p">'])],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T16650b_c.c</span><span class="p">'])</span></span>
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