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<h3>
Ben Gamari pushed to branch wip/memory-barriers
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/233c879a7f877ec3a9efcab69248556a074b4154">233c879a</a></strong>
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<span>by Ben Gamari</span>
<i>at 2019-06-18T19:36:55Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More comments from Simon
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<h4>3 changed files:</h4>
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<a href="#fbe566a2918ba0562be9aceeb5d07448bf2f9ed0">
includes/stg/SMP.h
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<li class="file-stats">
<a href="#84507939a4554de9c515fb6ece9c30b5178af638">
rts/sm/CNF.c
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<li class="file-stats">
<a href="#fc4b339ae37fb0232f0fb9338221077876a4247d">
rts/sm/MarkWeak.c
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<h4>Changes:</h4>
<li id="fbe566a2918ba0562be9aceeb5d07448bf2f9ed0">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/233c879a7f877ec3a9efcab69248556a074b4154#fbe566a2918ba0562be9aceeb5d07448bf2f9ed0"><strong>includes/stg/SMP.h</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">@@ -176,18 +176,13 @@ EXTERN_INLINE void load_load_barrier(void);</td>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This case is protected by explicit write barriers in the the update frame</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * entry code (see rts/Updates.h).</span></span>
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<pre style="margin: 0;"> <span id="LC178" 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="LC179" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Writing to the thread's local stack, followed by the thread blocking:</span></span>
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is protected by the write barrier necessary to place the thread on</span></span>
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * whichever blocking queue it is blocked on:</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Blocking on an MVar# (e.g. takeMVar#):</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * In this case the appropriate MVar primops (e.g. stg_takeMVarzh). include</span></span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * explicit memory barriers to ensure that the the newly-allocated</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * MVAR_TSO_QUEUE is visible to other cores.</span></span>
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<pre style="margin: 0;"> <span id="LC183" 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="LC183" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - a BLACKHOLE's BLOCKING_QUEUE: explicit barriers in</span></span>
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Messages.c:messageBlackHole and Messages.c:sendMessage.</span></span>
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<pre style="margin: 0;">-<span id="LC185" 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="LC186" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - a TVAR's STM_TVAR_WATCH_QUEUE: The CAS in STM.c:unlock_stm, called by</span></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * STM.c:stmWaitUnlock.</span></span>
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<pre style="margin: 0;">-<span id="LC188" 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="LC189" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - an MVAR's MVAR_TSO_QUEUE: explicit write barriers in the appropriate</span></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * MVar primops (e.g. stg_takeMVarzh).</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Write to an MVar# (e.g. putMVar#):</span></span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This protected by the full barrier implied by the CAS in putMVar#.</span></span>
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186
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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192
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Write to a TVar#:</span></span>
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is protected by the full barrier implied by the CAS in STM.c:lock_stm.</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">@@ -205,9 +200,6 @@ EXTERN_INLINE void load_load_barrier(void);</td>
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205
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is protected by the full barrier implied by the cmpxchg operations</span></span>
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * in this primops.</span></span>
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202
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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208
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Write to an MVar#:</span></span>
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209
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This protected by the full barrier implied by the CAS in putMVar#.</span></span>
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210
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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211
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Sending a Message to another capability:</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is protected by the acquition and release of the target capability's</span></span>
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213
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * lock in Messages.c:sendMessage.</span></span>
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<li id="84507939a4554de9c515fb6ece9c30b5178af638">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/233c879a7f877ec3a9efcab69248556a074b4154#84507939a4554de9c515fb6ece9c30b5178af638"><strong>rts/sm/CNF.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">@@ -543,7 +543,6 @@ insertCompactHash (Capability *cap,</td>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="c"> <span class="n" style="color: #333;">insertHashTable</span><span class="p">(</span><span class="n" style="color: #333;">str</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">hash</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgWord</span><span class="p">)</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="p">(</span><span class="k" style="font-weight: 600;">const</span> <span class="kt" style="color: #458; font-weight: 600;">void</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">to</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgInfoTable</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">strinfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">str</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC546" class="line" lang="c"> <span class="n" style="color: #333;">load_load_barrier</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">strinfo</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_COMPACT_NFDATA_CLEAN_info</span><span class="p">)</span> <span class="p">{</span></span>
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548
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="c"> <span class="n" style="color: #333;">strinfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_COMPACT_NFDATA_DIRTY_info</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="c"> <span class="n" style="color: #333;">recordClosureMutated</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">str</span><span class="p">);</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="687" 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">@@ -688,7 +687,6 @@ verify_consistency_block (StgCompactNFData *str, StgCompactNFDataBlock *block)</td>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">q</span><span class="p">));</span></span>
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689
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688
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="c"></span>
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690
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689
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="c"> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">q</span><span class="p">);</span></span>
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691
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="c"> <span class="n" style="color: #333;">load_load_barrier</span><span class="p">();</span></span>
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692
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690
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="c"> <span class="k" style="font-weight: 600;">switch</span> <span class="p">(</span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">)</span> <span class="p">{</span></span>
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693
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691
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<pre style="margin: 0;"> <span id="LC691" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">CONSTR_1_0</span><span class="p">:</span></span>
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694
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692
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="c"> <span class="n" style="color: #333;">check_object_in_compact</span><span class="p">(</span><span class="n" style="color: #333;">str</span><span class="p">,</span> <span class="n" style="color: #333;">UNTAG_CLOSURE</span><span class="p">(</span><span class="n" style="color: #333;">q</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">payload</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">]));</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="928" 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="926" 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">@@ -928,7 +926,6 @@ fixup_block(StgCompactNFDataBlock *block, StgWord *fixup_table, uint32_t count)</td>
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928
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">free</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num old_line" data-linenumber="929" 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">
929
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<td class="diff-line-num new_line" data-linenumber="927" 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">
927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">));</span></span>
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930
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<td class="diff-line-num new_line" data-linenumber="928" 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">
928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="c"> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_itbl</span><span class="p">((</span><span class="n" style="color: #333;">StgClosure</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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931
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="c"> <span class="n" style="color: #333;">load_load_barrier</span><span class="p">();</span></span>
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932
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929
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="c"></span>
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933
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930
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<pre style="margin: 0;"> <span id="LC930" class="line" lang="c"> <span class="k" style="font-weight: 600;">switch</span> <span class="p">(</span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">type</span><span class="p">)</span> <span class="p">{</span></span>
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934
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931
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">CONSTR_1_0</span><span class="p">:</span></span>
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<li id="fc4b339ae37fb0232f0fb9338221077876a4247d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/233c879a7f877ec3a9efcab69248556a074b4154#fc4b339ae37fb0232f0fb9338221077876a4247d"><strong>rts/sm/MarkWeak.c</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="235" 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">@@ -235,7 +235,10 @@ static bool tidyWeakList(generation *gen)</td>
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235
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235
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gen</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">old_weak_ptr_list</span><span class="p">;</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">next_w</span><span class="p">)</span> <span class="p">{</span></span>
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236
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236
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="c"></span>
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237
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237
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="c"> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span><span class="p">;</span></span>
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238
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="c"> <span class="n" style="color: #333;">load_load_barrier</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* N.B. This function is executed only during the serial part of GC</span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * so consequently there is no potential for data races and therefore</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * no need for memory barriers.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="239" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC241" 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="LC242" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* There might be a DEAD_WEAK on the list if finalizeWeak# was</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * called on a live weak pointer object. Just remove it.</span></span>
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