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<h3>
David Eichmann pushed to branch wip/T17747
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/fb2fca8f996443d6a7f53fc1b1430cf701a91681">fb2fca8f</a></strong>
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<span>by David Eichmann</span>
<i>at 2020-08-24T16:24:01+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve primop documentation
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/139d2f44f3339ff3bee9d5a77aa9be72bf677a9b">139d2f44</a></strong>
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<span>by David Eichmann</span>
<i>at 2020-08-24T16:24:30+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test addresses around the start of the heap for test T17747
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
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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="#6db965f97cbab901f493506a385bcf1283009921">
rts/PrimOps.cmm
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<li class="file-stats">
<a href="#ab624cb4173bf1d70bae30dfd7bf545190920d79">
testsuite/tests/rts/T17747.hs
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<h4>Changes:</h4>
<li id="451725cc4e5d443a3b7c2adcdf224840f953b7e2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6c085a637d1985d92fb70b157986cb5f8401f7ae...139d2f44f3339ff3bee9d5a77aa9be72bf677a9b#451725cc4e5d443a3b7c2adcdf224840f953b7e2"><strong>compiler/GHC/Builtin/primops.txt.pp</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1410" 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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1410,7 +1410,7 @@ section "Byte Arrays"</td>
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- It is useful to be able to allocate byte arrays outside of the heap,</span></span>
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<td class="diff-line-num old_line" data-linenumber="1411" 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">
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- i.e. outside of the memory space covered by the HEAP_ALLOCED() test.</span></span>
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- There are two major use cases:</span></span>
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- There are two major use cases<span class="idiff left right"> (see issue #17747)</span>:</span></span>
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- 1. Having foreign memory appear as a normal GHC byte array. This</span></span>
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- are use cases similar to the use of a ForeignPtr, but where it</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">@@ -1422,10 +1422,13 @@ section "Byte Arrays"</td>
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- The second is not yet available as it requires additional support</span></span>
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- from the code gen.</span></span>
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- A concrete use-case in the first category is to memory map a file</span></span>
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- An example of the first category can be seen in GHC test T17747.</span></span>
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- A concrete use-case is to memory map a file</span></span>
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- but have it appear as a ByteArray# rather than a ForeignPtr. Doing</span></span>
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<pre style="margin: 0;">-<span id="LC1427" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- so of course requires that space is reserved immediatly before the</span></span>
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- file data for the byte array heap object header.</span></span>
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- so of course requires that space is reserved immediately before the</span></span>
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- file data for the byte array heap object header. See the</span></span>
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- placeByteArray# primop documentation below and the FFI section of</span></span>
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- the user guide for more details.</span></span>
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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<pre style="margin: 0;"> <span id="LC1433" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- To have the first use-case work requires a few things:</span></span>
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</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">@@ -1433,31 +1436,35 @@ section "Byte Arrays"</td>
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- the HEAP_ALLOCED space. This is straightforward because the GC</span></span>
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- has support for a number of different closure types to appear</span></span>
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- outside the heap (primarily for statically allocated values), and</span></span>
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<pre style="margin: 0;">-<span id="LC1436" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- byte arrays are easy because they contain no heap pointers.</span></span>
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- byte arrays are easy because they contain no heap pointers. See</span></span>
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- the reference back to this note in `evacuate(StgClosure **p)` in</span></span>
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- `rts/sm/Evac.c`</span></span>
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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<pre style="margin: 0;">-<span id="LC1438" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- * For other primops to not fail when encountering byte arrays</span></span>
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1439
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<pre style="margin: 0;">-<span id="LC1439" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- outside of the heap. Specifically isByteArrayPinned# requires</span></span>
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1440
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<pre style="margin: 0;">-<span id="LC1440" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- special support. This is currently the only primop that needs</span></span>
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1441
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<pre style="margin: 0;">-<span id="LC1441" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- special support.</span></span>
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- * For all other byte array primops (e.g. shrinkMutableByteArray#,</span></span>
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<pre style="margin: 0;">+<span id="LC1444" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- sameMutableByteArray#, isByteArrayPinned#, etc.) to not fail when</span></span>
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- encountering byte arrays outside of the heap. Specifically</span></span>
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- isByteArrayPinned# requires special support. This is currently the</span></span>
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- only primop that needs special support.</span></span>
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- See Note [isByteArrayPinned# support for off heap byte arrays].</span></span>
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1442
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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1443
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1450
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<pre style="margin: 0;"> <span id="LC1450" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- * A mechanism to set up the heap object header for a byte array at</span></span>
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1444
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1451
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<pre style="margin: 0;"> <span id="LC1451" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- an address outside of the HEAP_ALLOCED space. This is needed to</span></span>
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1445
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1452
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<pre style="margin: 0;"> <span id="LC1452" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- make the foreign allocated memory look like a byte array. This is</span></span>
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1446
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1453
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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- provided by the placeByteArray# primop.</span></span>
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1447
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1454
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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1448
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<pre style="margin: 0;">-<span id="LC1448" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- A concrete use case is to memory map a file but have it appear as a</span></span>
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1449
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- ByteArray# rather than a ForeignPtr. Doing so of course requires</span></span>
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1450
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<pre style="margin: 0;">-<span id="LC1450" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- that space is reserved immediatly before the file data for the byte</span></span>
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1451
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<pre style="margin: 0;">-<span id="LC1451" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- array heap object header.</span></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" class="line" lang="puppet"><span class="s1" style="color: #d14;">--</span></span>
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1453
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<td class="diff-line-num new_line old" data-linenumber="1455" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1453" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- The special support in the isByteArrayPinned# primop is that it</span></span>
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1454
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<pre style="margin: 0;">-<span id="LC1454" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- needs to be able to test if the byte array is HEAP_ALLOCED or not</span></span>
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1455
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<pre style="margin: 0;">-<span id="LC1455" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- and if not then it is certainly pinned. This requires CMM support</span></span>
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1456
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<pre style="margin: 0;">-<span id="LC1456" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- for the HEAP_ALLOCED test, which is otherwise only called from C</span></span>
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1455
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="puppet"></span>
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- Note [isByteArrayPinned# support for off heap byte arrays]</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1458" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1458
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<pre style="margin: 0;">+<span id="LC1458" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- The isByteArrayPinned# primop is implemented by reading block descriptor</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- flags. Since off heap byte arrays don'</span><span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">have</span> <span class="n" style="color: #333;">block</span> <span class="n" style="color: #333;">descriptors</span><span class="p">,</span></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">isByteArrayPinned</span><span class="c" style="color: #998; font-style: italic;"># must explicitly check if the byte array is HEAP_ALLOCED</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1461" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1461
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<pre style="margin: 0;">+<span id="LC1461" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="ow" style="font-weight: 600;">or</span> <span class="n" style="color: #333;">not</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">If</span> <span class="n" style="color: #333;">not</span> <span class="nc" style="color: #458; font-weight: 600;">HEAP_ALLOCED</span> <span class="n" style="color: #333;">then</span> <span class="n" style="color: #333;">it</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">certainly</span> <span class="n" style="color: #333;">pinned</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">This</span> <span class="n" style="color: #333;">requires</span> <span class="nc" style="color: #458; font-weight: 600;">CMM</span></span>
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1462
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<pre style="margin: 0;">+<span id="LC1462" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">support</span> <span class="n" style="color: #333;">for</span> <span class="n" style="color: #333;">the</span> <span class="nc" style="color: #458; font-weight: 600;">HEAP_ALLOCED</span> <span class="n" style="color: #333;">test</span><span class="p">,</span> <span class="n" style="color: #333;">which</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">otherwise</span> <span class="n" style="color: #333;">only</span> <span class="n" style="color: #333;">called</span> <span class="n" style="color: #333;">from</span> <span class="nc" style="color: #458; font-weight: 600;">C</span></span>
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1457
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1463
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">code</span> <span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">the</span> <span class="nc" style="color: #458; font-weight: 600;">RTS</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">The</span> <span class="n" style="color: #333;">current</span> <span class="n" style="color: #333;">design</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">provide</span> <span class="n" style="color: #333;">full</span> <span class="nc" style="color: #458; font-weight: 600;">CMM</span></span>
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1458
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<td class="diff-line-num new_line old" data-linenumber="1464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1458" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- implementations of the code to implement HEAP_ALLOCED. This is fast</span></span>
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1459
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<td class="diff-line-num new_line old" data-linenumber="1464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1459" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- but essentially duplicates what is already a complex implementation.</span></span>
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1460
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<td class="diff-line-num new_line old" data-linenumber="1464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1460" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- An alternative would be to use a CMM C call to a C function that use</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1461" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">implementations</span> <span class="n" style="color: #333;">of</span> <span class="nc" style="color: #458; font-weight: 600;">HEAP_ALLOCED</span> <span class="n" style="color: #333;">enabled</span> <span class="ow" style="font-weight: 600;">in</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span><span class="n" style="color: #333;">rts</span><span class="o" style="font-weight: 600;">/</span><span class="n" style="color: #333;">sm</span><span class="o" style="font-weight: 600;">/</span><span class="nc" style="color: #458; font-weight: 600;">HeapAlloc</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">h</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span> <span class="n" style="color: #333;">with</span> <span class="n" style="color: #333;">the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1465" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1465
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<pre style="margin: 0;">+<span id="LC1465" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="nc" style="color: #458; font-weight: 600;">CMINUSMINUS</span> <span class="n" style="color: #333;">cpp</span> <span class="n" style="color: #333;">flag</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">This</span> <span class="k" style="font-weight: 600;">include</span><span class="nc" style="color: #458; font-weight: 600;">s</span> <span class="nc" style="color: #458; font-weight: 600;">HEAP_ALLOCED_CALLISH</span> <span class="n" style="color: #333;">which</span> <span class="n" style="color: #333;">essentially</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1466" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1466
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<pre style="margin: 0;">+<span id="LC1466" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">duplicates</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">already</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">complex</span> <span class="nc" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">implementation</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">This</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">fast</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1467" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1467
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">but</span> <span class="n" style="color: #333;">an</span> <span class="n" style="color: #333;">alternative</span> <span class="n" style="color: #333;">would</span> <span class="n" style="color: #333;">be</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">use</span> <span class="n" style="color: #333;">a</span> <span class="nc" style="color: #458; font-weight: 600;">CMM</span> <span class="nc" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">call</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">a</span> <span class="nc" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">function</span> <span class="n" style="color: #333;">that</span> <span class="n" style="color: #333;">use</span></span>
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1461
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<td class="diff-line-num new_line" data-linenumber="1468" 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">
1468
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">existing</span> <span class="nc" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">implementation</span> <span class="n" style="color: #333;">of</span> <span class="nc" style="color: #458; font-weight: 600;">HEAP_ALLOCED</span><span class="o" style="font-weight: 600;">.</span></span>
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1462
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1469
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<pre style="margin: 0;"> <span id="LC1469" class="line" lang="puppet"></span>
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1463
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1470
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<pre style="margin: 0;"> <span id="LC1470" class="line" lang="puppet"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1475" 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">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1482" 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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1475,8 +1482,14 @@ primop NewByteArrayOp_Char "newByteArray#" GenPrimOp</td>
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1475
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<td class="diff-line-num new_line" data-linenumber="1482" 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">
1482
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<pre style="margin: 0;"> <span id="LC1482" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="nc" style="color: #458; font-weight: 600;">See</span> <span class="p">[</span><span class="nc" style="color: #458; font-weight: 600;">Byte</span> <span class="n" style="color: #333;">arrays</span> <span class="n" style="color: #333;">outside</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">the</span> <span class="nc" style="color: #458; font-weight: 600;">HEAP_ALLOCED</span> <span class="n" style="color: #333;">space</span><span class="p">]</span></span>
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1476
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<td class="diff-line-num new_line" data-linenumber="1483" 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">
1483
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<pre style="margin: 0;"> <span id="LC1483" class="line" lang="puppet"><span class="n" style="color: #333;">primop</span> <span class="nc" style="color: #458; font-weight: 600;">PlaceByteArrayOp_Char</span> <span class="s2" style="color: #d14;">"placeByteArray#"</span> <span class="nc" style="color: #458; font-weight: 600;">GenPrimOp</span></span>
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1477
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<td class="diff-line-num new_line" data-linenumber="1484" 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">
1484
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="puppet"> <span class="nc" style="color: #458; font-weight: 600;">Addr</span><span class="c" style="color: #998; font-style: italic;"># -> Int# -> State# s -> (# State# s, MutableByteArray# s #)</span></span>
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1478
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<td class="diff-line-num new_line old" data-linenumber="1485" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1478" class="line" lang="puppet"><span class="s1" style="color: #d14;"> {Place a new byte array header for the specified size (in bytes), at the</span></span>
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1479
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<td class="diff-line-num new_line old" data-linenumber="1485" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1479" class="line" lang="puppet"><span class="s1" style="color: #d14;"> specified address outside of the heap, in the specified state thread.}</span></span>
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1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="puppet"> <span class="p">{</span><span class="nc" style="color: #458; font-weight: 600;">Place</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">new</span> <span class="n" style="color: #333;">byte</span> <span class="n" style="color: #333;">array</span> <span class="n" style="color: #333;">header</span> <span class="n" style="color: #333;">at</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">specified</span> <span class="n" style="color: #333;">address</span> <span class="n" style="color: #333;">outside</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">heap</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1486" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1486
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<pre style="margin: 0;">+<span id="LC1486" class="line" lang="puppet"> <span class="n" style="color: #333;">for</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">specified</span> <span class="n" style="color: #333;">payload</span> <span class="nf" style="color: #900; font-weight: 600;">size</span> <span class="p">(</span><span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">bytes</span><span class="p">),</span> <span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">specified</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">thread</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">In</span></span>
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<pre style="margin: 0;">+<span id="LC1487" class="line" lang="puppet"> <span class="nc" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">code</span> <span class="n" style="color: #333;">with</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span><span class="c" style="color: #998; font-style: italic;">#include "Rts.h"`, use `sizeOf(StgArrBytes)` or</span></span>
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="puppet"> <span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span><span class="nf" style="color: #900; font-weight: 600;">sizeOfW</span><span class="p">(</span><span class="nc" style="color: #458; font-weight: 600;">StgArrBytes</span><span class="p">)</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">get</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">size</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">byte</span> <span class="n" style="color: #333;">array</span> <span class="n" style="color: #333;">header</span> <span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">bytes</span> <span class="ow" style="font-weight: 600;">or</span></span>
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<pre style="margin: 0;">+<span id="LC1489" class="line" lang="puppet"> <span class="n" style="color: #333;">words</span> <span class="n" style="color: #333;">respectively</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">The</span> <span class="n" style="color: #333;">caller</span> <span class="n" style="color: #333;">must</span> <span class="n" style="color: #333;">ensure</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span><span class="nf" style="color: #900; font-weight: 600;">sizeof</span><span class="p">(</span><span class="nc" style="color: #458; font-weight: 600;">StgArrBytes</span><span class="p">)</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">n</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">`</span> <span class="n" style="color: #333;">bytes</span> <span class="n" style="color: #333;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1490" class="line" lang="puppet"> <span class="n" style="color: #333;">space</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">allocated</span> <span class="n" style="color: #333;">at</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">give</span> <span class="n" style="color: #333;">address</span> <span class="n" style="color: #333;">for</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">heap</span> <span class="n" style="color: #333;">object</span> <span class="n" style="color: #333;">header</span> <span class="n" style="color: #333;">followed</span> <span class="n" style="color: #333;">by</span></span>
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<pre style="margin: 0;">+<span id="LC1491" class="line" lang="puppet"> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">bytes</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">payload</span><span class="o" style="font-weight: 600;">.</span> <span class="nc" style="color: #458; font-weight: 600;">See</span> <span class="n" style="color: #333;">the</span> <span class="nc" style="color: #458; font-weight: 600;">FFI</span> <span class="n" style="color: #333;">section</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">user</span> <span class="n" style="color: #333;">guide</span> <span class="n" style="color: #333;">for</span> <span class="n" style="color: #333;">more</span> <span class="n" style="color: #333;">details</span></span>
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<pre style="margin: 0;">+<span id="LC1492" class="line" lang="puppet"> <span class="n" style="color: #333;">on</span> <span class="n" style="color: #333;">how</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">use</span> <span class="n" style="color: #333;">this</span> <span class="n" style="color: #333;">primop</span><span class="o" style="font-weight: 600;">.</span><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1493" class="line" lang="puppet"> <span class="n" style="color: #333;">with</span> <span class="n" style="color: #333;">out_of_line</span> <span class="o" style="font-weight: 600;">=</span> <span class="nc" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC1494" class="line" lang="puppet"> <span class="n" style="color: #333;">has_side_effects</span> <span class="o" style="font-weight: 600;">=</span> <span class="nc" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC1495" class="line" lang="puppet"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6c085a637d1985d92fb70b157986cb5f8401f7ae...139d2f44f3339ff3bee9d5a77aa9be72bf677a9b#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">@@ -788,7 +788,7 @@ Note that the object header size is different for normal and profiling</td>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="plaintext">builds. When allocating in foreign memory, space must be made available</span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="plaintext">for this in the memory layout immediately before the data payload.</span>
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC791" class="line" lang="plaintext">In C code, ``#include "<span class="idiff left right">r</span>ts.h"`` and use ``sizeOf(StgArrBytes)`` or</span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="plaintext">In C code, ``#include "<span class="idiff left right">R</span>ts.h"`` and use ``sizeOf(StgArrBytes)`` or</span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="plaintext">``sizeOfW(StgArrBytes)`` to get the size of a byte array heap object</span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="plaintext">header in bytes or words respectively. This is the space that must be</span>
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="plaintext">reserved at the memory location immediately before the intended payload.</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6c085a637d1985d92fb70b157986cb5f8401f7ae...139d2f44f3339ff3bee9d5a77aa9be72bf677a9b#6db965f97cbab901f493506a385bcf1283009921"><strong>rts/PrimOps.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">@@ -74,6 +74,7 @@ stg_newByteArrayzh ( W_ n )</td>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="ghc-cmm"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="ghc-cmm"><span class="nf" style="color: #900; font-weight: 600;">stg_placeByteArrayzh</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">addr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">n</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="ghc-cmm"><span class="c1" style="color: #998; font-style: italic;">// Addr# -> Int# -> MutableByteArray# {</span></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="ghc-cmm"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="ghc-cmm"> <span class="cm" style="color: #998; font-style: italic;">/* Place an ARR_WORDS object header at the given address outside the heap.</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="ghc-cmm"><span class="cm" style="color: #998; font-style: italic;"> The caller must arrange for space for the heap object header. */</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6c085a637d1985d92fb70b157986cb5f8401f7ae...139d2f44f3339ff3bee9d5a77aa9be72bf677a9b#ab624cb4173bf1d70bae30dfd7bf545190920d79"><strong>testsuite/tests/rts/T17747.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">@@ -55,9 +55,12 @@ heapallocedTest = do</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrLn</span> <span class="p">(</span><span class="s" style="color: #d14;">"HEAP_ALLOCED = "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">same</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\t</span><span class="s" style="color: #d14;">(c_HEAP_ALLOCED ptr == cmm_HEAP_ALLOCED ptr)"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="haskell"> <span class="n" style="color: #333;">addrs</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"> <span class="n" style="color: #333;">heapStart</span> <span class="o" style="font-weight: 600;">=</span> <span class="mh" style="color: #099;">0x4200000000</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"> <span class="n" style="color: #333;">addrs</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Addresses around the start of the heap</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">heapStart</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">offset</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">offset</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1000</span><span class="o" style="font-weight: 600;">..</span><span class="mi" style="color: #099;">1000</span><span class="p">]]</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2k address probes, appropriate to the address space</span></span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">sizeOf</span> <span class="p">(</span><span class="n" style="color: #333;">nullPtr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">++</span></span><span class="idiff right"> </span><span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">sizeOf</span> <span class="p">(</span><span class="n" style="color: #333;">nullPtr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">^</span><span class="mi" style="color: #099;">21</span> <span class="o" style="font-weight: 600;">..</span> <span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">^</span><span class="mi" style="color: #099;">32</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- 0 to 4Gb-1 in 2Mb jumps</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="mi" style="color: #099;">8</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">^</span><span class="mi" style="color: #099;">30</span> <span class="o" style="font-weight: 600;">..</span> <span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">^</span><span class="mi" style="color: #099;">41</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- 0 to 2Tb-1 in 1Gb jumps</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"sizeOf ptr not 4 or 8"</span></span>
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