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<h3>
Matthew Pickering pushed to branch wip/con-info
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/a6ef34bb20b9adda775954039a7c69a84535751e">a6ef34bb</a></strong>
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<span>by Matthew Pickering</span>
<i>at 2020-11-09T11:13:19+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve docs, a little
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<h4>1 changed file:</h4>
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<a href="#9df7e695170800345fb44916a8e8f4b8f3c55be0">
compiler/GHC/Driver/CodeOutput.hs
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<h4>Changes:</h4>
<li id="9df7e695170800345fb44916a8e8f4b8f3c55be0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a6ef34bb20b9adda775954039a7c69a84535751e#9df7e695170800345fb44916a8e8f4b8f3c55be0"><strong>compiler/GHC/Driver/CodeOutput.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">@@ -353,11 +353,12 @@ to a position in the source. The prime example is being able to map a THUNK to</td>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a specific place in the source program, the mapping is usually quite precise because</span></span>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a fresh info table is created for each distinct THUNK.</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are t<span class="idiff left right">wo</span> parts to the implementation</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are t<span class="idiff left right">hree</span> parts to the implementation</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. <span class="idiff left right">T</span>he SourceNote information is used in order to give a source location to</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. <span class="idiff left right">In CoreToStg, t</span>he SourceNote information is used in order to give a source location to</span></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">some specific closures.</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. During code generation, a mapping from the info table to the statically</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. In StgToCmm, the actually used info tables are recorded.</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. During code generation, a mapping from the info table to the statically</span></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">determined location is emitted which can then be queried at runtime by</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">various tools.</span></span>
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<pre style="margin: 0;"> <span id="LC364" 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">@@ -373,6 +374,9 @@ During the CoreToStg phase, this map is populated whenever something is turned i</td>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a StgRhsClosure or an StgConApp. The current source position is recorded</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depending on the location indicated by the surrounding SourceNote.</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The functions which add information to the map are `recordStgIdPosition` and</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`incDc`.</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"></span>
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380
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When the -fdistinct-constructor-tables` flag is turned on then every</span></span>
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381
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">usage of a data constructor gets its own distinct info table. This is orchestrated</span></span>
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378
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in `coreToStgExpr` where an incrementing number is used to distinguish each</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">@@ -382,10 +386,16 @@ occurrence of a data constructor.</td>
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382
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386
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"></span>
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383
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387
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The info tables which are actually used in the generated program are recorded during the</span></span>
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384
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">conversion from STG to Cmm. The used info tables are recorded in the `emitProc` function.</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All the used info tables are recorded in the `cgs_used_info` field. This step</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is necessary because when the information about names is collected in the previous</span></span>
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391
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">phase it's unpredictable about which names will end up needing info tables. If</span></span>
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392
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">you don't record which ones are actually used then you end up generating code</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which references info tables which don't exist.</span></span>
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385
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394
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Code Generation</span></span>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">After the mapping has been collected during compilation, a C stub is generated which</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The output of these two phases is combined together during code generation.</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A C stub is generated which</span></span>
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389
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399
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">creates the static map from info table pointer to the information about where that</span></span>
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390
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">info table was created from. This is created by `ipInitCode` in the same manner as a</span></span>
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391
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401
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">C stub is generated for cost centres.</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">@@ -406,4 +416,4 @@ can cause code generation to generate a distinct info table for each usage of</td>
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406
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416
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a constructor. Then, when inspecting the heap you can see precisely which usage of a constructor</span></span>
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407
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417
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">was responsible for each allocation.</span></span>
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408
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418
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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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">\ No newline at end of file</td>
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419
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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