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<h3>
Ben Gamari pushed to branch wip/T17619
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/8cbfcac64e6650badcd99a3d189801e7d9faa3cb">8cbfcac6</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-05-21T11:35:57-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplCore: Ignore ticks in rule templates
This fixes #17619, where a tick snuck in to the template of a rule,
resulting in a panic during rule matching. The tick in question was
introduced via post-inlining, as discussed in `Note [Simplifying
rules]`. The solution we decided upon was to simply ignore ticks in the
rule template, as discussed in `Note [Tick annotations in RULE
matching]`.
Fixes #18162.
Fixes #17619.
</pre>
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#48fbb5cdea308650de5756521feb28ec68819b9b">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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<a href="#d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
compiler/GHC/Core/Rules.hs
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<h4>Changes:</h4>
<li id="48fbb5cdea308650de5756521feb28ec68819b9b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cbfcac64e6650badcd99a3d189801e7d9faa3cb#48fbb5cdea308650de5756521feb28ec68819b9b"><strong>compiler/GHC/Core/Opt/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">@@ -830,6 +830,21 @@ Ticks into the LHS, which makes matching trickier. #10665, #10745.</td>
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830
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830
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Doing this to either side confounds tools like HERMIT, which seek to reason</span></span>
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">about and apply the RULES as originally written. See #10829.</span></span>
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832
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is, however, one case where we are pretty much /forced/ to transform the</span></span>
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">LHS of a rule: postInlineUnconditionally. For instance, in the case of</span></span>
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let f = g @Int in f</span></span>
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We very much want to inline f into the body of the let. However, to do so (and</span></span>
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be able to safely drop f's binding) we must inline into all occurrences of f,</span></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">including those in the LHS of rules.</span></span>
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This can cause somewhat surprising results; for instance, in #18162 we found</span></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that a rule template contained ticks in its arguments, because</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">postInlineUnconditionally substituted in a trivial expression that contains</span></span>
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ticks. See Note [Tick annotations in RULE matching] in GHC.Core.Rules for</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">details.</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No eta expansion in stable unfoldings]</span></span>
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<pre style="margin: 0;"> <span id="LC849" 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="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we have a stable unfolding</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">@@ -1251,6 +1266,10 @@ it's best to inline it anyway. We often get a=E; b=a from desugaring,</td>
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with both a and b marked NOINLINE. But that seems incompatible with</span></span>
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1267
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<pre style="margin: 0;"> <span id="LC1267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">our new view that inlining is like a RULE, so I'm sticking to the 'active'</span></span>
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1268
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<pre style="margin: 0;"> <span id="LC1268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">story for now.</span></span>
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1269
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<pre style="margin: 0;">+<span id="LC1269" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: unconditional inlining of this sort can introduce ticks in places that</span></span>
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<pre style="margin: 0;">+<span id="LC1271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">may seem surprising; for instance, the LHS of rules. See Note [Simplfying</span></span>
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<pre style="margin: 0;">+<span id="LC1272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rules] for details.</span></span>
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<pre style="margin: 0;"> <span id="LC1273" 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="LC1274" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1275" class="line" lang="haskell"><span class="n" style="color: #333;">postInlineUnconditionally</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cbfcac64e6650badcd99a3d189801e7d9faa3cb#d01de95d8c71d4dec6a9a59146186e29a5b3fd38"><strong>compiler/GHC/Core/Rules.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">@@ -714,11 +714,15 @@ match :: RuleMatchEnv</td>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- Target</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">RuleSubst</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We look through certain ticks. See <span class="idiff left right">n</span>ote [Tick annotations in RULE matching]</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We look through certain ticks. See <span class="idiff left right">N</span>ote [Tick annotations in RULE matching]</span></span>
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">e2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span></span>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs_binds</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mkTick</span> <span class="n" style="color: #333;">t</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">e1</span><span class="p">)</span> <span class="n" style="color: #333;">e2</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ignore ticks in rule template.</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">renv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">e2</span></span>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="haskell"><span class="n" style="color: #333;">match</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span><span class="p">{}</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"Tick in rule"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="haskell"></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">@@ -1016,7 +1020,7 @@ Hence, (a) the guard (not (isLocallyBoundR v2))</td>
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Tick annotations in RULE matching]</span></span>
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<pre style="margin: 0;"> <span id="LC1021" 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="LC1022" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We used to unconditionally look through <span class="idiff left right">Note</span>s in both template and</span></span>
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We used to unconditionally look through <span class="idiff left right">tick</span>s in both template and</span></span>
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expression being matched. This is actually illegal for counting or</span></span>
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cost-centre-scoped ticks, because we have no place to put them without</span></span>
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">changing entry counts and/or costs. So now we just fail the match in</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">@@ -1025,6 +1029,11 @@ these cases.</td>
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">On the other hand, where we are allowed to insert new cost into the</span></span>
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tick scope, we can float them upwards to the rule application site.</span></span>
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, we may encounter ticks in the template of a rule. There are a few</span></span>
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ways in which these may be introduced (e.g. #18162, #17619). Such ticks are</span></span>
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ignored by the matcher. See Note [Simplifying rules] in</span></span>
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Opt.Simplify.Utils for details.</span></span>
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cf Note [Notes in call patterns] in GHC.Core.Opt.SpecConstr</span></span>
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1029
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"></span>
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1030
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Matching lets]</span></span>
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