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<h3>
Sebastian Graf pushed to branch wip/T13380
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac492646fe3453a78c3f7e5f5e97d9736f973cda">ac492646</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-26T19:01:17+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve precise exceptions in strictness analysis
Fix #13380 and #17676 by
1. Changing `raiseIO#` to have `topDiv` instead of `botDiv`
2. Give it special treatment in `Simplifier.Util.mkArgInfo`, treating it
as if it still had `botDiv`, to recover dead code elimination.
This is the first commit of the plan outlined in
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/2525#note_260886.
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#b73ea2c5744c45878c8939cf97da70308baa7e48">
compiler/GHC/Core/Op/Simplify/Utils.hs
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<li class="file-stats">
<a href="#10828b99499a9ef1e9839b007762c68994bcb036">
compiler/basicTypes/Demand.hs
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<li class="file-stats">
<a href="#2a8bedbc781353ca3c4d1e56daba6faa8829aaf3">
compiler/prelude/primops.txt.pp
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<li class="file-stats">
<a href="#1bc7b84857875083fbceeecd8990cce33c4167d5">
<span class="new-file">
+
testsuite/tests/stranal/should_run/T17676.hs
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<li class="file-stats">
<a href="#fcabe0b768ce21a012d35e3434a69ded3f3024bd">
testsuite/tests/stranal/should_run/all.T
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<h4>Changes:</h4>
<li id="b73ea2c5744c45878c8939cf97da70308baa7e48">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac492646fe3453a78c3f7e5f5e97d9736f973cda#b73ea2c5744c45878c8939cf97da70308baa7e48"><strong>compiler/GHC/Core/Op/Simplify/Utils.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">@@ -55,6 +55,7 @@ import Name</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Id</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">IdInfo</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Var</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrimOp</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Demand</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Op.Simplify.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="n" style="color: #333;">hiding</span><span class="p">(</span> <span class="n" style="color: #333;">substTy</span> <span class="p">)</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">@@ -500,7 +501,9 @@ mkArgInfo env fun rules n_val_args call_cont</td>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- calls to error. But now we are more careful about</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inlining lone variables, so it's ok</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (see GHC.Core.Op.Simplify.Utils.analyseCont)</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isBotDiv</span> <span class="n" style="color: #333;">result_info</span> <span class="kr" style="font-weight: 600;">then</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Precise exceptions and strictness analysis] in Demand.hs</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for the special case on raiseIO#</span></span>
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<td class="diff-line-num new new_line" data-linenumber="506" 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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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isBotDiv</span> <span class="n" style="color: #333;">result_info</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isPrimOpId_maybe</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">RaiseIOOp</span> <span class="kr" style="font-weight: 600;">then</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">isStrictDmd</span> <span class="n" style="color: #333;">demands</span> <span class="c1" style="color: #998; font-style: italic;">-- Finite => result is bottom</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">isStrictDmd</span> <span class="n" style="color: #333;">demands</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">vanilla_stricts</span></span>
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<li id="10828b99499a9ef1e9839b007762c68994bcb036">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac492646fe3453a78c3f7e5f5e97d9736f973cda#10828b99499a9ef1e9839b007762c68994bcb036"><strong>compiler/basicTypes/Demand.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">@@ -932,6 +932,53 @@ instance Outputable Divergence where</td>
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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">Diverges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'b'</span></span>
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933
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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934
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934
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Precise vs imprecise exceptions]</span></span>
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An exception is considered to be /precise/ when it is thrown by the 'raiseIO#'</span></span>
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">primop. It follows that all other primops (such as 'raise#' or</span></span>
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">division-by-zero) throw /imprecise/ exceptions. Note that the actual type of</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the exception thrown doesn't have any impact!</span></span>
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941
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC undertakes some effort not to apply an optimisation that would mask a</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/precise/ exception with some other source of nontermination, such as genuine</span></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">divergence or an imprecise exception, so that the user can reliably</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">intercept the precise exception with a catch handler before and after</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">optimisations.</span></span>
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also the wiki page on precise exceptions:</span></span>
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949
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">https://gitlab.haskell.org/ghc/ghc/-/wikis/exceptions/precise-exceptions</span></span>
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Section 5 of "Tackling the awkward squad" talks about semantic concerns.</span></span>
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Imprecise exceptions are actually more interesting than precise ones (which are</span></span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fairly standard) from the perspective of semantics. See the paper "A Semantics</span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for Imprecise Exceptions" for more details.</span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Precise exceptions and strictness analysis]</span></span>
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956
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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957
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">raiseIO# raises a *precise* exception, in contrast to raise# which</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">raise an *imprecise* exception. See Note [Precise vs imprecise exceptions]</span></span>
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959
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in XXXX.</span></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unlike raise# (which returns botDiv), we want raiseIO# to return topDiv.</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here's why. Consider this example from #13380 (similarly #17676):</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x y | x>0 = raiseIO Exc</span></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | y>0 = return 1</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = return 2</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Is 'f' strict in 'y'? One might be tempted to say yes! But that plays fast and</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loose with the precise exception; after optimisation, (f 42 (error "boom"))</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turns from throwing the precise Exc to throwing the imprecise user error</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"boom". So, the defaultDmd of raiseIO# should be lazy (topDmd), which can be</span></span>
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970
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">achieved by giving it divergence topDiv.</span></span>
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971
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But if it returns topDiv, the simplifier will fail to discard raiseIO#'s</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">continuation in</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case raiseIO# x s of { (# s', r #) -> <BIG> }</span></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we'd like to optimise to</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> raiseIO# x s</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Temporary hack solution: special treatment for raiseIO# in</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Simplifier.Utils.mkArgInfo.</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Combined demand result --</span></span>
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------------</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac492646fe3453a78c3f7e5f5e97d9736f973cda#2a8bedbc781353ca3c4d1e56daba6faa8829aaf3"><strong>compiler/prelude/primops.txt.pp</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">@@ -2644,27 +2644,12 @@ primop RaiseOverflowOp "raiseOverflow#" GenPrimOp</td>
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2644
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2644
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<pre style="margin: 0;"> <span id="LC2644" class="line" lang="puppet"><span class="s1" style="color: #d14;"> out_of_line = True</span></span>
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2645
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2645
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<pre style="margin: 0;"> <span id="LC2645" class="line" lang="puppet"><span class="s1" style="color: #d14;"> has_side_effects = True</span></span>
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2646
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2646
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<pre style="margin: 0;"> <span id="LC2646" class="line" lang="puppet"></span>
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2647
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<pre style="margin: 0;">-<span id="LC2647" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- raiseIO# needs to be a primop, because exceptions in the IO monad</span></span>
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2648
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<pre style="margin: 0;">-<span id="LC2648" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- must be *precise* - we don'</span><span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">want</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">strictness</span> <span class="n" style="color: #333;">analyser</span> <span class="n" style="color: #333;">turning</span></span>
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2649
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<pre style="margin: 0;">-<span id="LC2649" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">one</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">bottom</span> <span class="n" style="color: #333;">into</span> <span class="n" style="color: #333;">another</span><span class="p">,</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">it</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">allowed</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">do</span> <span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">code</span><span class="o" style="font-weight: 600;">.</span></span>
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2650
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<pre style="margin: 0;">-<span id="LC2650" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span></span>
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2651
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<pre style="margin: 0;">-<span id="LC2651" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="nc" style="color: #458; font-weight: 600;">But</span> <span class="n" style="color: #333;">we</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">do</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">want</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">know</span> <span class="n" style="color: #333;">that</span> <span class="n" style="color: #333;">it</span> <span class="n" style="color: #333;">returns</span> <span class="n" style="color: #333;">bottom</span> <span class="n" style="color: #333;">after</span></span>
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2652
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<pre style="margin: 0;">-<span id="LC2652" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">being</span> <span class="n" style="color: #333;">applied</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">two</span> <span class="n" style="color: #333;">arguments</span><span class="p">,</span> <span class="n" style="color: #333;">so</span> <span class="n" style="color: #333;">that</span> <span class="n" style="color: #333;">this</span> <span class="n" style="color: #333;">function</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">strict</span> <span class="ow" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">y</span></span>
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2653
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<pre style="margin: 0;">-<span id="LC2653" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">|</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">></span><span class="m" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">raiseIO</span> <span class="n" style="color: #333;">blah</span></span>
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2654
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<td class="diff-line-num new_line old" data-linenumber="2647" 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="LC2654" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="p">|</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">></span><span class="m" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="m" style="color: #099;">1</span></span>
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2655
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<td class="diff-line-num new_line old" data-linenumber="2647" 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="LC2655" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="p">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="m" style="color: #099;">2</span></span>
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2656
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<pre style="margin: 0;">-<span id="LC2656" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span></span>
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2657
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<pre style="margin: 0;">-<span id="LC2657" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="nc" style="color: #458; font-weight: 600;">TODO</span> <span class="nc" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">that</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">above</span> <span class="n" style="color: #333;">notes</span> <span class="n" style="color: #333;">on</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">@</span><span class="n" style="color: #333;">f</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">@</span> <span class="n" style="color: #333;">are</span> <span class="n" style="color: #333;">valid</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;">function</span> <span class="n" style="color: #333;">successfully</span></span>
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<pre style="margin: 0;">-<span id="LC2658" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">produces</span> <span class="n" style="color: #333;">an</span> <span class="nc" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">exception</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">compiled</span> <span class="n" style="color: #333;">without</span> <span class="n" style="color: #333;">optimization</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;">we</span> <span class="n" style="color: #333;">analyze</span></span>
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2659
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<pre style="margin: 0;">-<span id="LC2659" class="line" lang="puppet"><span class="o" style="font-weight: 600;">--</span> <span class="n" style="color: #333;">it</span> <span class="n" style="color: #333;">as</span> <span class="n" style="color: #333;">strict</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;">y</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">@</span><span class="p">,</span> <span class="n" style="color: #333;">won</span><span class="s1" style="color: #d14;">'t we change that behavior under optimization?</span></span>
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2660
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<pre style="margin: 0;">-<span id="LC2660" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- I thought the rule was that it was okay to replace one valid imprecise</span></span>
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2661
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<pre style="margin: 0;">-<span id="LC2661" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- exception with another, but not to replace a precise exception with</span></span>
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2662
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<pre style="margin: 0;">-<span id="LC2662" class="line" lang="puppet"><span class="s1" style="color: #d14;">-- an imprecise one (dfeuer, 2017-03-05).</span></span>
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2663
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<pre style="margin: 0;">-<span id="LC2663" class="line" lang="puppet"></span>
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2664
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2647
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<pre style="margin: 0;"> <span id="LC2647" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop RaiseIOOp "raiseIO#" GenPrimOp</span></span>
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2648
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<pre style="margin: 0;"> <span id="LC2648" class="line" lang="puppet"><span class="s1" style="color: #d14;"> a -> State# RealWorld -> (# State# RealWorld, b #)</span></span>
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2666
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2649
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<pre style="margin: 0;"> <span id="LC2649" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with</span></span>
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2667
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<pre style="margin: 0;">-<span id="LC2667" class="line" lang="puppet"><span class="s1" style="color: #d14;"> strictness = { \ _arity -> mkClosedStrictSig [topDmd, topDmd] botDiv }</span></span>
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2650
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<pre style="margin: 0;">+<span id="LC2650" class="line" lang="puppet"><span class="s1" style="color: #d14;"> -- See Note [Precise exceptions and strictness analysis] in Demand.hs</span></span>
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<pre style="margin: 0;">+<span id="LC2651" class="line" lang="puppet"><span class="s1" style="color: #d14;"> -- for why we give it topDiv</span></span>
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<pre style="margin: 0;">+<span id="LC2652" class="line" lang="puppet"><span class="s1" style="color: #d14;"> -- strictness = { \ _arity -> mkClosedStrictSig [topDmd, topDmd] topDiv }</span></span>
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<pre style="margin: 0;"> <span id="LC2653" class="line" lang="puppet"><span class="s1" style="color: #d14;"> out_of_line = True</span></span>
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<pre style="margin: 0;"> <span id="LC2654" class="line" lang="puppet"><span class="s1" style="color: #d14;"> has_side_effects = True</span></span>
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<pre style="margin: 0;"> <span id="LC2655" class="line" lang="puppet"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac492646fe3453a78c3f7e5f5e97d9736f973cda#1bc7b84857875083fbceeecd8990cce33c4167d5"><strong>testsuite/tests/stranal/should_run/T17676.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.IORef</span></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;">Control.Exception</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;">Control.Monad</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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Exc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Exc</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Show</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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span> <span class="kt" style="color: #458; font-weight: 600;">Exc</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Recursive instead of NOINLINE because of #17673</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">f</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="kt" style="color: #458; font-weight: 600;">Int</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="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">x</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="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">true</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sum</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span><span class="mi" style="color: #099;">4</span><span class="p">]</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">10</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">true</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">throwIO</span> <span class="kt" style="color: #458; font-weight: 600;">Exc</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">seq</span><span class="p">`</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</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 class="p">(</span><span class="n" style="color: #333;">x</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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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"expensive computation"</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">catch</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Exc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac492646fe3453a78c3f7e5f5e97d9736f973cda#fcabe0b768ce21a012d35e3434a69ded3f3024bd"><strong>testsuite/tests/stranal/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">@@ -19,7 +19,8 @@ test('T11076', normal, multimod_compile_and_run, ['T11076.hs', 'T11076_prim.cmm'</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T11555a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12368</span><span class="p">',</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12368a</span><span class="p">',</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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22
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13380</span><span class="p">',</span> <span class="p"><span class="idiff left">[</span></span><span class="nv" style="color: #008080;"><span class="idiff">expect_broken</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">13380</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="nv" style="color: #008080;"><span class="idiff">exit_code</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff right">)]</span>,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13380</span><span class="p">',</span> <span class="nv" style="color: #008080;"><span class="idiff left">exit_code</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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23
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14171</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">14171</span><span class="p">),</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">)],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14290</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14285</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T14285</span><span class="p">',</span> <span class="p">''])</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17676</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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