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<h3>
Ben Gamari pushed to branch wip/T18527
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/d04d0eafefa6ace6d5addd20a344cb731eec0903">d04d0eaf</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-08-04T15:35:12-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmLint: Check foreign call argument register invariant
As mentioned in Note [Register parameter passing] the arguments of
foreign calls cannot refer to caller-saved registers.
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<h4>1 changed file:</h4>
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<a href="#cf82b82d6e47b3c81686a3340668a31ce028e2a1">
compiler/GHC/Cmm/Lint.hs
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<h4>Changes:</h4>
<li id="cf82b82d6e47b3c81686a3340668a31ce028e2a1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d04d0eafefa6ace6d5addd20a344cb731eec0903#cf82b82d6e47b3c81686a3340668a31ce028e2a1"><strong>compiler/GHC/Cmm/Lint.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">@@ -6,6 +6,7 @@</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveFunctor #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Cmm.Lint</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">cmmLint</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cmmLintGraph</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="15" 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">@@ -14,6 +15,7 @@ module GHC.Cmm.Lint (</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Platform</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Platform.Regs</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">callerSaves</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.Dataflow.Block</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.Dataflow.Collections</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Cmm.Dataflow.Graph</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">@@ -26,7 +28,7 @@ import GHC.Cmm.Ppr () -- For Outputable instances</td>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">ap</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">ap</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">unless</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Things to check:</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - invariant on CmmBlock in GHC.Cmm.Expr (see comment there)</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">@@ -160,7 +162,14 @@ lintCmmMiddle node = case node of</td>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmUnsafeForeignCall</span> <span class="n" style="color: #333;">target</span> <span class="n" style="color: #333;">_formals</span> <span class="n" style="color: #333;">actuals</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">lintTarget</span> <span class="n" style="color: #333;">target</span></span>
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lintCmmExpr</span> <span class="n" style="color: #333;">actuals</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lintArg</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Arguments can't mention caller-saved</span></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- registers. See See Note [Register</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parameter passing].</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">mayNotMentionCallerSavedRegs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"foreign call argument"</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCmmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lintArg</span> <span class="n" style="color: #333;">actuals</span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">lintCmmLast</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LabelSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmNode</span> <span class="kt" style="color: #458; font-weight: 600;">O</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmLint</span> <span class="nb" style="color: #0086b3;">()</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">@@ -188,18 +197,37 @@ lintCmmLast labels node = case node of</td>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmmForeignCall</span> <span class="n" style="color: #333;">tgt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">succ</span> <span class="kr" style="font-weight: 600;">_</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="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <span class="n" style="color: #333;">lintTarget</span> <span class="n" style="color: #333;">tgt</span></span>
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lintCmmExpr</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lintArg</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Arguments can't mention caller-saved</span></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- registers. See See Note [Register</span></span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parameter passing].</span></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">mayNotMentionCallerSavedRegs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"foreign call argument"</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCmmExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">lintArg</span> <span class="n" style="color: #333;">args</span></span>
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192
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTarget</span> <span class="n" style="color: #333;">succ</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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194
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTarget</span> <span class="n" style="color: #333;">id</span></span>
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195
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">setMember</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">labels</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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196
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<pre style="margin: 0;"> <span id="LC211" 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;">cmmLintErr</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Branch to nonexistent id"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"><span class="n" style="color: #333;">lintTarget</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignTarget</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmLint</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">lintTarget</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignTarget</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lintCmmExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="n" style="color: #333;">lintTarget</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignTarget</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"> <span class="n" style="color: #333;">mayNotMentionCallerSavedRegs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"foreign target"</span><span class="p">)</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCmmExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"><span class="n" style="color: #333;">lintTarget</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrimTarget</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"><span class="cd">-- | As noted in Note [Register parameter passing], the arguments and</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'ForeignTarget' of a foreign call mustn't mention</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- caller-saved registers.</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"><span class="n" style="color: #333;">mayNotMentionCallerSavedRegs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UserOfRegs</span> <span class="kt" style="color: #458; font-weight: 600;">GlobalReg</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmLint</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="n" style="color: #333;">mayNotMentionCallerSavedRegs</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">badRegs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">callerSaves</span> <span class="p">(</span><span class="n" style="color: #333;">targetPlatform</span> <span class="n" style="color: #333;">dflags</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">foldRegsUsed</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">flip</span> <span class="p">(</span><span class="o" style="font-weight: 600;">:</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">thing</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">badRegs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cmmLintErr</span> <span class="p">(</span><span class="n" style="color: #333;">what</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"mentions caller-saved registers: "</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">badRegs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="n" style="color: #333;">checkCond</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Platform</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmmLint</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="n" style="color: #333;">checkCond</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmMachOp</span> <span class="n" style="color: #333;">mop</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isComparisonMachOp</span> <span class="n" style="color: #333;">mop</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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