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<h3>
Sebastian Graf pushed to branch wip/T17676
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/3d667c3249a166a6c936589c688a143141bacc5f">3d667c32</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-03-19T18:55:46Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments
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<h4>2 changed files:</h4>
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<a href="#1a7aba0daeafab195716dd25432479804a55ab60">
compiler/GHC/Core/Utils.hs
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<a href="#10828b99499a9ef1e9839b007762c68994bcb036">
compiler/basicTypes/Demand.hs
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<h4>Changes:</h4>
<li id="1a7aba0daeafab195716dd25432479804a55ab60">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/3d667c3249a166a6c936589c688a143141bacc5f#1a7aba0daeafab195716dd25432479804a55ab60"><strong>compiler/GHC/Core/Utils.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1111" 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">@@ -1111,7 +1111,7 @@ exprIsBottom e</td>
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1111
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1111
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<pre style="margin: 0;"> <span id="LC1111" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1112
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1112
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<pre style="margin: 0;"> <span id="LC1112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">e</span></span>
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1113
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1113
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<pre style="margin: 0;"> <span id="LC1113" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1114
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isDeadEndId</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">v</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isDeadEndId</span> <span class="n" style="color: #333;">v</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">v</span></span>
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1115
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1115
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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeArg</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">e</span></span>
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1116
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<pre style="margin: 0;"> <span id="LC1116" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</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="n" style="color: #333;">e</span></span>
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1117
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<pre style="margin: 0;"> <span id="LC1117" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">e</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/3d667c3249a166a6c936589c688a143141bacc5f#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">@@ -186,10 +186,25 @@ only used by `raiseIO#` in order to preserve precise exceptions by strictness</td>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">analysis, while not impacting the ability to eliminate dead code.</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Precise exceptions and strictness analysis].</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [What are precise exceptions?]</span></span>
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<pre style="margin: 0;">+<span id="LC190" 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="LC191" 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="LC192" 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="LC193" 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="LC194" 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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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC196" 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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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/precise/ exception with some other source of divergence, such as genuine</span></span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">non-termination or an imprecise exception, so that the user can reliably</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" 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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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">optimisations.</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See the paper "A Semantics for Imprecise Exceptions" for more details.</span></span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC204" 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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<pre style="margin: 0;"> <span id="LC205" 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="LC191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have to take care to preserve precise exception semantics <span class="idiff left right">(#17676).</span></span></span>
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are two scenarios that need careful hacks.</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have to take care to preserve precise exception semantics <span class="idiff left right">in strictness</span></span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">analysis (#17676). </span>There are two scenarios that need careful hacks.</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Scenario 1: Precise exceptions in case scrutinees</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------</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">@@ -211,9 +226,9 @@ So the 'y' isn't necessarily going to be evaluated.</td>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To detect this scenario, why we track precise exceptions in the Divergence</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lattice. Specifically, if 'foo' throws an exception, the Divergence in its</span></span>
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness signature will indicate so (<span class="idiff left right">ExnOrDiv or Dunno</span>), in which case</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness signature will indicate so (<span class="idiff left right">'exnDiv' or 'topDiv'</span>), in which case</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Demand.deferAfterPreciseException' will lub with the strictness analysis</span></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">results of the virtual branch.</span></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">results of the virtual branch<span class="idiff left right"> when @dmdAnal'@ysing the @Case@</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A more complete example (#148, #1592) where this shows up is:</span></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do { let len = <expensive> ;</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">@@ -232,15 +247,29 @@ The motivating example for #13380 is the following:</td>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x y | x>0 = raiseIO blah</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | y>0 = return 1</span></span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = return 2</span></span>
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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If 'f' was inferred to be strict in 'y', WW would turn a precise into an</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">imprecise exception in the call site @f 1 (error "boom")@.</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution is to give 'raiseIO#' 'topDiv' instead of 'botDiv', so that its</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Demand.defaultFvDmd' is lazy. But then the simplifier fails to eliminate a lot</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of dead code, namely when 'raiseIO#' occurs in a case scrutinee. Hence we need</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to give it 'exnDiv', which was conceived entirely for this reason. The default</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FV demand of 'exnDiv' is lazy, its default arg dmd is absent, but otherwise (in</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">terms of 'Demand.isDeadEndDiv') it behaves exactly as 'botDiv', so that dead code</span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'f' should not be strict in 'y'. If 'f' was inferred to be strict in 'y', WW</span></span>
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">would turn a precise into an imprecise exception in the call site</span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@f 1 (error "boom")@. If the user wrote a catch block for the precise exception</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">around that call site, it would no longer match.</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Contrast this with</span></span>
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g x y | x>0 = error "You won't see this"</span></span>
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257
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = return 2</span></span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'error' throws an imprecise exception, which the compiler is free to mask</span></span>
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259
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a different exception or non-termination as it sees fit.</span></span>
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260
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might think that the solution is to give 'raiseIO#' 'topDiv' instead of</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'botDiv' (which we do for 'error' and other kinds of bottom), so that its</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Demand.defaultFvDmd' is lazy (cf. Note [Default demand on free variables and arguments]).</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then the first branch would no longer be strict in 'y'.</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But then the simplifier would fail to eliminate a lot of dead code (which</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happens in 'Simplifier.rebuildCall', feeding on the 'arg_stricts' constructed</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in 'SimplUtils.mkArgInfo', which in turn consults 'isDeadEndDiv') when</span></span>
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'raiseIO#' occurs in a case scrutinee. Hence we need to give it 'exnDiv', which</span></span>
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">was conceived entirely for this reason. The default FV demand of 'exnDiv' is</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lazy (and its default arg dmd is absent), but otherwise (in terms of</span></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Demand.isDeadEndDiv') it behaves exactly as 'botDiv', so that dead code</span></span>
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244
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">elimination works as expected.</span></span>
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245
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274
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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246
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275
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1007" 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="1036" 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">@@ -1007,7 +1036,7 @@ lubDivergence ConOrDiv ConOrDiv = ConOrDiv</td>
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1007
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"><span class="n" style="color: #333;">lubDivergence</span> <span class="kr" style="font-weight: 600;">_</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;">Dunno</span></span>
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1008
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This needs to commute with defaultFvDmd, i.e.</span></span>
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1009
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- defaultFvDmd (r1 `lubDivergence` r2) = defaultFvDmd r1 `lubDmd` defaultFvDmd r2</span></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (See Note [Default demand on free variables] for why)</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (See Note [Default demand on free variables<span class="idiff left right"> and arguments</span>] for why)</span></span>
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1011
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"></span>
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1012
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"><span class="n" style="color: #333;">bothDivergence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span></span>
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1013
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Asymmetry of 'both' for DmdType and Divergence]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1046" 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="1075" 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">@@ -1046,7 +1075,7 @@ isDeadEndDiv ExnOrDiv = True</td>
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1046
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"><span class="n" style="color: #333;">isDeadEndDiv</span> <span class="kt" style="color: #458; font-weight: 600;">ConOrDiv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1047
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<td class="diff-line-num new_line" data-linenumber="1076" 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">
1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"><span class="n" style="color: #333;">isDeadEndDiv</span> <span class="kt" style="color: #458; font-weight: 600;">Dunno</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1048
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1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"></span>
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1049
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<pre style="margin: 0;">-<span id="LC1049" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Notes [Default demand on free variables]</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Notes [Default demand on free variables<span class="idiff left right"> and arguments</span>]</span></span>
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1050
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1079
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and [defaultFvDmd vs. defaultArgDmd]</span></span>
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1051
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1080
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Scenario 2 in [Precise exceptions and strictness analysis]</span></span>
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1052
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"><span class="n" style="color: #333;">defaultFvDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Divergence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Demand</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">@@ -1087,7 +1116,7 @@ different:</td>
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1087
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1116
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<pre style="margin: 0;"> <span id="LC1116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1088
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1117
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<pre style="margin: 0;"> <span id="LC1117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1089
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1118
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<pre style="margin: 0;"> <span id="LC1118" class="line" lang="haskell"></span>
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1090
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<pre style="margin: 0;">-<span id="LC1090" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Default demand on free variables]</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Default demand on free variables<span class="idiff left right"> and arguments</span>]</span></span>
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1091
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1120
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<pre style="margin: 0;"> <span id="LC1120" class="line" lang="haskell"></span>
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1092
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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1093
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1122
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<pre style="margin: 0;"> <span id="LC1122" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DmdEnv</span> <span class="c1" style="color: #998; font-style: italic;">-- Demand on explicitly-mentioned</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">@@ -1484,7 +1513,7 @@ peelFV (DmdType fv ds res) id = -- pprTrace "rfv" (ppr id <+> ppr dmd $$ ppr fv)</td>
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1484
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1513
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="n" style="color: #333;">fv'</span> <span class="n" style="color: #333;">ds</span> <span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">dmd</span><span class="p">)</span></span>
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1485
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1514
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<pre style="margin: 0;"> <span id="LC1514" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1486
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1515
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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"> <span class="n" style="color: #333;">fv'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fv</span> <span class="p">`</span><span class="n" style="color: #333;">delVarEnv</span><span class="p">`</span> <span class="n" style="color: #333;">id</span></span>
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1487
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<pre style="margin: 0;">-<span id="LC1487" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Default demand on free variables]</span></span>
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1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Default demand on free variables<span class="idiff left right"> and arguments</span>]</span></span>
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1488
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1517
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<pre style="margin: 0;"> <span id="LC1517" class="line" lang="haskell"> <span class="n" style="color: #333;">dmd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">id</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="n" style="color: #333;">defaultFvDmd</span> <span class="n" style="color: #333;">res</span></span>
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1489
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1518
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<pre style="margin: 0;"> <span id="LC1518" class="line" lang="haskell"></span>
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1490
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1519
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"><span class="n" style="color: #333;">addDemand</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DmdType</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1495" 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>
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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">@@ -1495,17 +1524,24 @@ findIdDemand (DmdType fv _ res) id</td>
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1495
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1524
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<pre style="margin: 0;"> <span id="LC1524" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">fv</span> <span class="n" style="color: #333;">id</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="n" style="color: #333;">defaultFvDmd</span> <span class="n" style="color: #333;">res</span></span>
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1496
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1525
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<pre style="margin: 0;"> <span id="LC1525" class="line" lang="haskell"></span>
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1497
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1526
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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1498
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<pre style="margin: 0;">-<span id="LC1498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Default demand on free variables]</span></span>
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1499
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<pre style="margin: 0;">-<span id="LC1499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1500
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<pre style="margin: 0;">-<span id="LC1500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If the variable is not mentioned in the environment of a demand type,</span></span>
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1501
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<pre style="margin: 0;">-<span id="LC1501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">its demand is taken to be a result demand of the type.</span></span>
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1502
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<pre style="margin: 0;">-<span id="LC1502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> For the strictness component,</span></span>
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1503
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<pre style="margin: 0;">-<span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if the result demand is a Diverges, then we use HyperStr</span></span>
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1504
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<pre style="margin: 0;">-<span id="LC1504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> else we use Lazy</span></span>
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1505
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<pre style="margin: 0;">-<span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> For the usage component, we use Absent.</span></span>
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1506
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<pre style="margin: 0;">-<span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we use either absDmd or botDmd.</span></span>
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1507
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<pre style="margin: 0;">-<span id="LC1507" class="line" lang="haskell"></span>
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1508
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<pre style="margin: 0;">-<span id="LC1508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also note the equation for lubDivergence noted there.</span></span>
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1527
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Default demand on free variables and arguments]</span></span>
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1528
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<pre style="margin: 0;">+<span id="LC1528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1529
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Free variables not mentioned in the environment of a 'DmdType'</span></span>
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1530
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are demanded according to the demand type's Divergence:</span></span>
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1531
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In a Diverges (botDiv) context, that demand is botDmd</span></span>
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1532
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (HyperStr and Absent).</span></span>
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1533
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In all other contexts, the demand is absDmd (Lazy and Absent).</span></span>
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1534
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is recorded in 'defaultFvDmd'.</span></span>
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1535
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Similarly, we can eta-expand demand types to get demands on excess arguments</span></span>
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1537
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not accounted for in the type, by consulting 'defaultArgDmd':</span></span>
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In a Diverges (botDiv) context, that demand is again botDmd.</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In a ExnOrDiv (exnDiv) context, that demand is absDmd: We surely diverge</span></span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> before evaluating the excess argument, but don't want to eagerly evaluate</span></span>
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1541
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> it (cf. Note [Precise exceptions and strictness analysis]).</span></span>
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1542
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In all other contexts (conDiv, topDiv), the demand is topDmd, because</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> it's perfectly possible to enter the additional lambda and evaluate it</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in unforeseen ways.</span></span>
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1509
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1545
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"></span>
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1510
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1546
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<pre style="margin: 0;"> <span id="LC1546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Always analyse in virgin pass]</span></span>
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1511
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1547
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<pre style="margin: 0;"> <span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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