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<h3>
Marge Bot pushed to branch master
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/5cbf9934c59f7726781cc4cccf4748a5c09c4997">5cbf9934</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-03-19T04:39:27Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update "GHC differences to the FFI Chapter" in user guide.
The old entry had a heavy focus on how things had been. Which is
not what I generally look for in a user guide.
I also added a small section on behaviour of nested safe ffi calls.
[skip-ci]
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<h4>1 changed file:</h4>
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<a href="#f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2">
docs/users_guide/exts/ffi.rst
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<h4>Changes:</h4>
<li id="f1fb2cbc6312f41f6aac14d2046c24ce0c5cbea2">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/5cbf9934c59f7726781cc4cccf4748a5c09c4997#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">@@ -37,31 +37,51 @@ Guaranteed call safety</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext">The Haskell 2010 Report specifies that ``safe`` FFI calls must allow foreign</span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext">calls to safely call into Haskell code. In practice, this means that <span class="idiff left right">the</span></span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="plaintext"><span class="idiff left right">garbage collector must be able to run while these calls are in progress,</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="plaintext"><span class="idiff left right">moving heap-allocated Haskell values around arbitrarily</span>.</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">calls to safely call into Haskell code. In practice, this means that <span class="idiff left right">called</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"><span class="idiff left right">functions also have to assume heap-allocated Haskell values may move around</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"><span class="idiff left right">arbitrarily in order to allow for GC</span>.</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">This greatly constrains library authors since it implies that it is not safe to</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">pass any heap object reference to a ``safe`` foreign function call. For</span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="plaintext">instance, it is often desirable to pass <span class="idiff left right">an </span>:ref:`unpinned <pinned-byte-arrays>`</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext">instance, it is often desirable to pass :ref:`unpinned <pinned-byte-arrays>`</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">``ByteArray#``\s directly to native code to avoid making an otherwise-unnecessary</span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext">copy. However, this can <span class="idiff left right">only be done safely if the array is guaranteed not to be</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="plaintext">moved by the garbage collector in the middle of the call.</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">copy. However, this can <span class="idiff left right">not be done safely for ``safe`` calls since the array might</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"><span class="idiff left right">be </span>moved by the garbage collector in the middle of the call.</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext">The Chapter <span class="idiff left right">does *not* require implementations to refrain from doing the</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext"><span class="idiff left right">same for ``unsafe`` calls, s</span>o strictly Haskell 2010-conforming programs</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">The Chapter <span class="idiff left right">*does* allow for implementations to move objects around during</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"><span class="idiff left right">``unsafe`` calls as well. S</span>o strictly Haskell 2010-conforming programs</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">cannot pass heap-allocated references to ``unsafe`` FFI calls either.</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">GHC, since version 8.4, **guarantees** that garbage collection will never occur</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">during an ``unsafe`` call, even in the bytecode interpreter, and further guarantees</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">that ``unsafe`` calls will be performed in the calling thread. Making it safe to</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext">pass heap-allocated objects to unsafe functions.</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">In previous releases, GHC would take advantage of the freedom afforded by the</span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext">Chapter by performing ``safe`` foreign calls in place of ``unsafe`` calls in</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">the bytecode interpreter. This meant that some packages which worked when</span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="plaintext">compiled would fail under GHCi (e.g. :ghc-ticket:`13730`).</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">compiled would fail under GHCi (e.g. :ghc-ticket:`13730`). But this is no</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">longer the case in recent releases.</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">Interactions between ``safe`` calls and bound threads</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">A ``safe`` call calling into haskell is run on a bound thread by</span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext">the RTS. This means any nesting of ``safe`` calls will be executed on</span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext">the same operating system thread. *Sequential* ``safe`` calls however</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext">do not enjoy this luxury and may be run on arbitrary OS threads.</span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext">However, since version 8.4 this is no longer the case: GHC **guarantees** that</span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="plaintext">garbage collection will never occur during an ``unsafe`` call, even in the</span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="plaintext">bytecode interpreter, and further guarantees that ``unsafe`` calls will be</span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="plaintext">performed in the calling thread.</span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext">This behaviour is considered an implementation detail and code relying on</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext">thread local state should instead use one of the interfaces provided</span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext">in :base-ref:`Control.Concurrent.` to make this explicit.</span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext">For information on what bound threads are,</span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext">see the documentation for the :base-ref:`Control.Concurrent.`.</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext">For more details on the implementation see the Paper:</span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="plaintext">"Extending the Haskell Foreign Function Interface with Concurrency".</span>
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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">.. _ffi-ghcexts:</span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext"></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">@@ -100,7 +120,7 @@ restrictions:</td>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext"> of heap objects record writes for the purpose of garbage collection.</span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext"> An array of heap objects is passed to a foreign C function, the</span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext"> runtime does not record any writes. Consequently, it is not safe to</span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="plaintext"> write to an array of heap objects in a foreign function.<span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"> write to an array of heap objects in a foreign function.</span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext"> Since the runtime has no facilities for tracking mutation of a</span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext"> ``MutableByteArray#``, these can be safely mutated in any foreign</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext"> function.</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">@@ -169,7 +189,7 @@ In other situations, the C function may need knowledge of the RTS</td>
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">closure types. The following example sums the first element of</span>
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170
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="plaintext">each ``ByteArray#`` (interpreting the bytes as an array of ``CInt``)</span>
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171
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="plaintext">element of an ``ArrayArray##`` [3]_::</span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="plaintext"><span class="idiff left right"> </span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="plaintext"></span>
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173
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193
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="plaintext"> // C source, must include the RTS to make the struct StgArrBytes</span>
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<td class="diff-line-num old_line" data-linenumber="174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
174
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194
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="plaintext"> // available along with its fields: ptrs and payload.</span>
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175
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195
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="plaintext"> #include "Rts.h"</span>
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