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<h3>
Ben Gamari pushed to branch wip/T14334
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/61222af1a92d896b31ed8e3c44746b9b98082615">61222af1</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-14T21:54:24-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler/ByteCode: Allow 2^32 local labels
This widens LocalLabel to 2^16, avoiding the crash observed in #14334.
Closes #14334.
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<h4>3 changed files:</h4>
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<a href="#2f6f8d6d05acc04b08fff94df4b3996c65b87892">
compiler/GHC/ByteCode/Asm.hs
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<a href="#073b107caa98ea426694eacd6c08b492801a51a0">
compiler/GHC/ByteCode/Instr.hs
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<a href="#99771528d6dbafffa79f4900ea74e7d5ec76800c">
compiler/GHC/CoreToByteCode.hs
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<h4>Changes:</h4>
<li id="2f6f8d6d05acc04b08fff94df4b3996c65b87892">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61222af1a92d896b31ed8e3c44746b9b98082615#2f6f8d6d05acc04b08fff94df4b3996c65b87892"><strong>compiler/GHC/ByteCode/Asm.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">@@ -177,7 +177,9 @@ assembleBCO platform (ProtoBCO { protoBCOName = nm</td>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this BCO to be long.</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n_insns0</span><span class="p">,</span> <span class="n" style="color: #333;">lbl_map0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inspectAsm</span> <span class="n" style="color: #333;">platform</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">initial_offset</span> <span class="n" style="color: #333;">asm</span></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">n_insns</span><span class="p">,</span> <span class="n" style="color: #333;">lbl_map</span><span class="p">),</span> <span class="n" style="color: #333;">long_jumps</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isLarge</span> <span class="n" style="color: #333;">n_insns0</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">inspectAsm</span> <span class="n" style="color: #333;">platform</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">initial_offset</span> <span class="n" style="color: #333;">asm</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isLarge</span> <span class="p">(</span><span class="n" style="color: #333;">fromIntegral</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Map</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">size</span> <span class="n" style="color: #333;">lbl_map0</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isLarge</span> <span class="n" style="color: #333;">n_insns0</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">inspectAsm</span> <span class="n" style="color: #333;">platform</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">initial_offset</span> <span class="n" style="color: #333;">asm</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC183" 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="p">((</span><span class="n" style="color: #333;">n_insns0</span><span class="p">,</span> <span class="n" style="color: #333;">lbl_map0</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word</span></span>
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<li id="073b107caa98ea426694eacd6c08b492801a51a0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61222af1a92d896b31ed8e3c44746b9b98082615#073b107caa98ea426694eacd6c08b492801a51a0"><strong>compiler/GHC/ByteCode/Instr.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">@@ -50,7 +50,8 @@ data ProtoBCO a</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="n" style="color: #333;">protoBCOFFIs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FFIInfo</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="p">{</span> <span class="n" style="color: #333;">getLocalLabel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word16</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="cd">-- | A local block label (e.g. identifying a case alternative).</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="p">{</span> <span class="n" style="color: #333;">getLocalLabel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word32</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span><span class="p">)</span></span>
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56
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"></span>
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57
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61222af1a92d896b31ed8e3c44746b9b98082615#99771528d6dbafffa79f4900ea74e7d5ec76800c"><strong>compiler/GHC/CoreToByteCode.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1966" 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">@@ -1966,7 +1966,7 @@ data BcM_State</td>
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1966
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1966
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<pre style="margin: 0;"> <span id="LC1966" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">bcm_hsc_env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HscEnv</span></span>
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1967
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1967
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<pre style="margin: 0;"> <span id="LC1967" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uniqSupply</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSupply</span> <span class="c1" style="color: #998; font-style: italic;">-- for generating fresh variable names</span></span>
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1968
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1968
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<pre style="margin: 0;"> <span id="LC1968" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">thisModule</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span> <span class="c1" style="color: #998; font-style: italic;">-- current module (for breakpoints)</span></span>
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1969
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<pre style="margin: 0;">-<span id="LC1969" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nextlabel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word<span class="idiff left right">16</span></span> <span class="c1" style="color: #998; font-style: italic;">-- for generating local labels</span></span>
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1969
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<pre style="margin: 0;">+<span id="LC1969" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nextlabel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word<span class="idiff left right">32</span></span> <span class="c1" style="color: #998; font-style: italic;">-- for generating local labels</span></span>
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1970
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1970
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<pre style="margin: 0;"> <span id="LC1970" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ffis</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FFIInfo</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ffi info blocks, to free later</span></span>
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1971
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1971
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<pre style="margin: 0;"> <span id="LC1971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Should be free()d when it is GCd</span></span>
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1972
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1972
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<pre style="margin: 0;"> <span id="LC1972" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">modBreaks</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ModBreaks</span> <span class="c1" style="color: #998; font-style: italic;">-- info about breakpoints</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">@@ -2038,7 +2038,7 @@ getLabelBc</td>
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2038
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2038
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<pre style="margin: 0;"> <span id="LC2038" class="line" lang="haskell"> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"getLabelBc: Ran out of labels"</span></span>
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2039
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2039
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<pre style="margin: 0;"> <span id="LC2039" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">st</span><span class="p">{</span><span class="n" style="color: #333;">nextlabel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nl</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">},</span> <span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span> <span class="n" style="color: #333;">nl</span><span class="p">)</span></span>
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2040
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2040
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<pre style="margin: 0;"> <span id="LC2040" class="line" lang="haskell"></span>
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2041
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<pre style="margin: 0;">-<span id="LC2041" class="line" lang="haskell"><span class="n" style="color: #333;">getLabelsBc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word<span class="idiff left right">16</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span><span class="p">]</span></span>
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2041
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<pre style="margin: 0;">+<span id="LC2041" class="line" lang="haskell"><span class="n" style="color: #333;">getLabelsBc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word<span class="idiff left right">32</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LocalLabel</span><span class="p">]</span></span>
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2042
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2042
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<pre style="margin: 0;"> <span id="LC2042" class="line" lang="haskell"><span class="n" style="color: #333;">getLabelsBc</span> <span class="n" style="color: #333;">n</span></span>
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2043
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2043
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<pre style="margin: 0;"> <span id="LC2043" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BcM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">st</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nextlabel</span> <span class="n" style="color: #333;">st</span></span>
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2044
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<pre style="margin: 0;"> <span id="LC2044" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">st</span><span class="p">{</span><span class="n" style="color: #333;">nextlabel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctr</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">n</span><span class="p">},</span> <span class="n" style="color: #333;">coerce</span> <span class="p">[</span><span class="n" style="color: #333;">ctr</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">ctr</span><span class="o" style="font-weight: 600;">+</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">])</span></span>
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