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<h3>
Ben Gamari pushed to branch wip/T16742
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/fafdc6accc987e09fc14172ea1c6e8d70faae73c">fafdc6ac</a></strong>
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<span>by Ben Gamari</span>
<i>at 2019-06-04T02:09:12Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow runtimeError applications under let/app invariant
PrelRules.shiftRule can now rewrite Int# expressions to bottom due to
the invalid-shift check introduced by
1503da32d26fb59fb6ebb620bfd0f8c08638f627. To accomodate this we allow
known-bottoming expressions under the let/app invariant.
</pre>
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<h4>2 changed files:</h4>
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<a href="#da5742c4b404a672740f0eef71683f5a8dd3818e">
compiler/coreSyn/CoreLint.hs
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<a href="#c51feff1097e886121a45f5d4b0baf4d9793d59e">
compiler/coreSyn/CoreSyn.hs
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<h4>Changes:</h4>
<li id="da5742c4b404a672740f0eef71683f5a8dd3818e">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/fafdc6accc987e09fc14172ea1c6e8d70faae73c#da5742c4b404a672740f0eef71683f5a8dd3818e"><strong>compiler/coreSyn/CoreLint.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="536" 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="536" 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">@@ -536,7 +536,8 @@ lintSingleBinding top_lvl_flag rec_flag (binder,rhs)</td>
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536
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536
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">binder</span></span>
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537
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537
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isUnliftedType</span> <span class="n" style="color: #333;">binder_ty</span><span class="p">)</span></span>
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538
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<td class="diff-line-num new_line" data-linenumber="538" 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">
538
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">isNonRec</span> <span class="n" style="color: #333;">rec_flag</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">exprOkForSpeculation</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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539
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">exprIsTickedString</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">exprIsTickedString</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badBndrTyMsg</span> <span class="n" style="color: #333;">binder</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"unlifted"</span><span class="p">))</span></span>
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541
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542
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"></span>
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543
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that if the binder is top-level or recursive, it's not</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1018" 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="1019" 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">@@ -1018,7 +1019,7 @@ lintCoreArg fun_ty arg</td>
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1018
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">))))</span></span>
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1019
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- check for levity polymorphism first, because otherwise isUnliftedType panics</span></span>
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isUnliftedType</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">exprOkForSpeculation</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isUnliftedType</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">exprOkForSpeculation</span> <span class="n" style="color: #333;">arg</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">||</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">exprIsBottom</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg</span></span><span class="p">)</span></span>
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1022
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkLetAppMsg</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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1023
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintValApp</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">}</span></span>
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1024
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1025
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<pre style="margin: 0;"> <span id="LC1025" 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">@@ -420,9 +420,9 @@ parts of the compilation pipeline.</td>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CoreSyn let/app invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC422" 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="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The let/app invariant</span></span>
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<pre style="margin: 0;">-<span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> </span>the right hand side of a non-recursive 'Let', and</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> </span>the argument of an 'App',</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The let/app invariant<span class="idiff left right">:</span></span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the right hand side of a non-recursive 'Let', and</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the argument of an 'App',</span></span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> /may/ be of unlifted type, but only if</span></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the expression is ok-for-speculation</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or the 'Let' is for a join point.</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">@@ -445,6 +445,14 @@ which will generate a @case@ if necessary</td>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The let/app invariant is initially enforced by mkCoreLet and mkCoreApp in</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coreSyn/MkCore.</span></span>
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One notable exception to this rule is bottoming expressions. For instance, we</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allow</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y::Int = I# (runtimeError ...)</span></span>
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">since we sometimes need to make unlifted bindings bottom (e.g. see</span></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PrelRules.shiftRule).</span></span>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CoreSyn type and coercion invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC457" 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="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We allow a /non-recursive/, /non-top-level/ let to bind type and</span></span>
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