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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b08e0c06e038448a63aa9bd7f163b23d824ba4b">5b08e0c0</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-04-14T23:28:20-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">StgCRun: Enable unwinding only on Linux
It's broken on macOS due and SmartOS due to assembler differences
(#15207) so let's be conservative in enabling it. Also, refactor things
to make the intent clearer.
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<h4>1 changed file:</h4>
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<a href="#58538d5291ee4e1bbdcd28de5ef291880c691d06">
rts/StgCRun.c
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<h4>Changes:</h4>
<li id="58538d5291ee4e1bbdcd28de5ef291880c691d06">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b08e0c06e038448a63aa9bd7f163b23d824ba4b#58538d5291ee4e1bbdcd28de5ef291880c691d06"><strong>rts/StgCRun.c</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">@@ -29,6 +29,13 @@</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "PosixSource.h"</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "ghcconfig.h"</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Enable DWARF Call-Frame Information (used for stack unwinding) on Linux.</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// This is not supported on Darwin and SmartOS due to assembler differences</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// (#15207).</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(linux_HOST_OS)</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define ENABLE_UNWINDING</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(sparc_HOST_ARCH) || defined(USE_MINIINTERPRETER)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* include Stg.h first because we want real machine regs in here: we</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * have to get the value of R1 back from Stg land to C land intact.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="405" 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="412" 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">@@ -405,7 +412,7 @@ StgRunIsImplementedInAssembler(void)</td>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="c"> <span class="s" style="color: #d14;">"movq %%xmm15,136(%%rax)</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if <span class="idiff left right">!defined(darwin_HOST_OS</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if <span class="idiff left right">defined(ENABLE_UNWINDING</span>)</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Let the unwinder know where we saved the registers</span></span>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See Note [Unwinding foreign exports on x86-64].</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">@@ -444,7 +451,7 @@ StgRunIsImplementedInAssembler(void)</td>
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444
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451
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#error "RSP_DELTA too big"</span></span>
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445
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452
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<pre style="margin: 0;"> <span id="LC452" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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453
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="c"> <span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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447
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<pre style="margin: 0;">-<span id="LC447" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* <span class="idiff left right">!defined(darwin_HOST_OS</span>) */</span></span>
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454
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* <span class="idiff left right">defined(ENABLE_UNWINDING</span>) */</span></span>
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455
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="c"></span>
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456
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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450
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457
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Set BaseReg</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="526" 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">@@ -519,7 +526,7 @@ StgRunIsImplementedInAssembler(void)</td>
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519
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526
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="c"> <span class="s" style="color: #d14;">"i"</span><span class="p">(</span><span class="n" style="color: #333;">RESERVED_C_STACK_BYTES</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">STG_RUN_STACK_FRAME_SIZE</span></span>
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520
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527
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* rip relative to cfa */</span><span class="p">)</span></span>
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521
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528
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="c"></span>
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522
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if <span class="idiff left right">!defined(darwin_HOST_OS</span>)</span></span>
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529
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if <span class="idiff left right">defined(ENABLE_UNWINDING</span>)</span></span>
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523
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530
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="c"> <span class="p">,</span> <span class="s" style="color: #d14;">"i"</span><span class="p">((</span><span class="n" style="color: #333;">RSP_DELTA</span> <span class="o" style="font-weight: 600;">&</span> <span class="mi" style="color: #099;">127</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="mi" style="color: #099;">128</span> <span class="o" style="font-weight: 600;">*</span> <span class="p">((</span><span class="n" style="color: #333;">RSP_DELTA</span> <span class="o" style="font-weight: 600;">>></span> <span class="mi" style="color: #099;">7</span><span class="p">)</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)))</span></span>
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524
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531
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* signed LEB128-encoded delta from rsp - byte 1 */</span></span>
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532
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if (RSP_DELTA >> 7) > 0</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">@@ -538,7 +545,7 @@ StgRunIsImplementedInAssembler(void)</td>
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538
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545
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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539
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546
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#undef RSP_DELTA</span></span>
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547
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* <span class="idiff left right">!defined(darwin_HOST_OS</span>) */</span></span>
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548
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* <span class="idiff left right">defined(ENABLE_UNWINDING</span>) */</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="c"> <span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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