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<h3>
Ben Gamari pushed to branch wip/T17922
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/6bf85e01e9c3baec32e95a0ff129f69c8b0b6230">6bf85e01</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-03-30T11:14:43-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Session: Memoize stderrSupportsAnsiColors
Not only is this a reasonable efficiency measure but it avoids making
reentrant calls into ncurses, which is not thread-safe. See #17922.
</pre>
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<li class="file-stats">
<a href="#b5293b078eb6c44f702248dd629f1afc4cb6a1b1">
compiler/main/SysTools/Terminal.hs
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<h4>Changes:</h4>
<li id="774d88050336ef660c7a219fb06c480c2fc639bc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6bf85e01e9c3baec32e95a0ff129f69c8b0b6230#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1253" 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">@@ -1253,7 +1253,6 @@ initDynFlags dflags = do</td>
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<pre style="margin: 0;"> <span id="LC1253" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">catchIOError</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"> <span class="n" style="color: #333;">ghcNoUnicodeEnv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupEnv</span> <span class="s" style="color: #d14;">"GHC_NO_UNICODE"</span></span>
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">useUnicode'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNothing</span> <span class="n" style="color: #333;">ghcNoUnicodeEnv</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">canUseUnicode</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1256" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1256
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<pre style="margin: 0;">-<span id="LC1256" class="line" lang="haskell"> <span class="n" style="color: #333;">canUseColor</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stderrSupportsAnsiColors</span></span>
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1257
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"> <span class="n" style="color: #333;">maybeGhcColorsEnv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupEnv</span> <span class="s" style="color: #d14;">"GHC_COLORS"</span></span>
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<pre style="margin: 0;"> <span id="LC1257" class="line" lang="haskell"> <span class="n" style="color: #333;">maybeGhcColoursEnv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupEnv</span> <span class="s" style="color: #d14;">"GHC_COLOURS"</span></span>
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">adjustCols</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Col</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">parseScheme</span> <span class="n" style="color: #333;">env</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1270" 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="1269" 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">@@ -1270,7 +1269,7 @@ initDynFlags dflags = do</td>
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<pre style="margin: 0;"> <span id="LC1269" class="line" lang="haskell"> <span class="n" style="color: #333;">nextWrapperNum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapperNum</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC1270" class="line" lang="haskell"> <span class="n" style="color: #333;">useUnicode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">useUnicode'</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC1271" class="line" lang="haskell"> <span class="n" style="color: #333;">useColor</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">useColor'</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"> <span class="n" style="color: #333;">canUseColor</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">canUseColor</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC1272" class="line" lang="haskell"> <span class="n" style="color: #333;">canUseColor</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">stderrSupportsAnsiColors</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"> <span class="n" style="color: #333;">colScheme</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">colScheme'</span><span class="p">,</span></span>
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1275
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<pre style="margin: 0;"> <span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">rtldInfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">refRtldInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC1275" class="line" lang="haskell"> <span class="n" style="color: #333;">rtccInfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">refRtccInfo</span></span>
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<li id="b5293b078eb6c44f702248dd629f1afc4cb6a1b1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6bf85e01e9c3baec32e95a0ff129f69c8b0b6230#b5293b078eb6c44f702248dd629f1afc4cb6a1b1"><strong>compiler/main/SysTools/Terminal.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">@@ -18,6 +18,8 @@ import qualified Graphics.Win32 as Win32</td>
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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="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">System.Win32</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Win32</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></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;">System.IO.Unsafe</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="n" style="color: #333;">mingw32_HOST_OS</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WINAPI</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="n" style="color: #333;">i386_HOST_ARCH</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">define</span> <span class="kt" style="color: #458; font-weight: 600;">WINAPI</span> <span class="n" style="color: #333;">stdcall</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">@@ -28,9 +30,15 @@ import qualified System.Win32 as Win32</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</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="cd">-- | Does the controlling terminal support ANSI color sequences?</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;">-- This memoized to avoid thread-safety issues in ncurses (see #17922).</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">stderrSupportsAnsiColors</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="n" style="color: #333;">stderrSupportsAnsiColors</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafePerformIO</span> <span class="n" style="color: #333;">stderrSupportsAnsiColors'</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE stderrSupportsAnsiColors #-}</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="cd">-- | Check if ANSI escape sequences can be used to control color in stderr.</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">stderrSupportsAnsiColors</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">stderrSupportsAnsiColors</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="LC40" class="line" lang="haskell"><span class="n" style="color: #333;">stderrSupportsAnsiColors<span class="idiff left right">'</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="n" style="color: #333;">stderrSupportsAnsiColors<span class="idiff left right">'</span></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="LC42" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MIN_VERSION_terminfo</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="n" style="color: #333;">queryTerminal</span> <span class="n" style="color: #333;">stdError</span> <span class="p">`</span><span class="n" style="color: #333;">andM</span><span class="p">`</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">termSupportsColors</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">setupTermFromEnv</span><span class="p">)</span></span>
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