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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- Code generation for foreign calls.</span>
<a name="line-4"></a><span class='hs-comment'>--</span>
<a name="line-5"></a><span class='hs-comment'>-- (c) The University of Glasgow 2004-2006</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>StgCmmForeign</span> <span class='hs-layout'>(</span>
<a name="line-10"></a> <span class='hs-varid'>cgForeignCall</span><span class='hs-layout'>,</span> <span class='hs-varid'>loadThreadState</span><span class='hs-layout'>,</span> <span class='hs-varid'>saveThreadState</span><span class='hs-layout'>,</span>
<a name="line-11"></a> <span class='hs-varid'>emitPrimCall</span><span class='hs-layout'>,</span> <span class='hs-varid'>emitCCall</span><span class='hs-layout'>,</span>
<a name="line-12"></a> <span class='hs-varid'>emitSaveThreadState</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- will be needed by the Cmm parser</span>
<a name="line-13"></a> <span class='hs-varid'>emitLoadThreadState</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ditto</span>
<a name="line-14"></a> <span class='hs-varid'>emitOpenNursery</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-cpp'>#include "HsVersions.h"</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgSyn</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgCmmProf</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgCmmEnv</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgCmmMonad</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgCmmUtils</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgCmmClosure</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>BlockId</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Cmm</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>CmmUtils</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>MkZipCfgCmm</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmAGraph</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Type</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>TysPrim</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>CLabel</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>SMRep</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ForeignCall</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Constants</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StaticFlags</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Maybes</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Outputable</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ZipCfgCmmRep</span>
<a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>BasicTypes</span>
<a name="line-41"></a>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-45"></a><span class='hs-comment'>-- Code generation for Foreign Calls</span>
<a name="line-46"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="cgForeignCall"></a><span class='hs-definition'>cgForeignCall</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>LocalReg</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- r1,r2 where to put the results</span>
<a name="line-49"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ForeignHint</span><span class='hs-keyglyph'>]</span>
<a name="line-50"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ForeignCall</span> <span class='hs-comment'>-- the op</span>
<a name="line-51"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>StgArg</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- x,y arguments</span>
<a name="line-52"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-53"></a><span class='hs-comment'>-- Emits code for an unsafe foreign call: r1, r2 = foo( x, y, z )</span>
<a name="line-54"></a>
<a name="line-55"></a><span class='hs-definition'>cgForeignCall</span> <span class='hs-varid'>results</span> <span class='hs-varid'>result_hints</span> <span class='hs-layout'>(</span><span class='hs-conid'>CCall</span> <span class='hs-layout'>(</span><span class='hs-conid'>CCallSpec</span> <span class='hs-varid'>target</span> <span class='hs-varid'>cconv</span> <span class='hs-varid'>safety</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>stg_args</span>
<a name="line-56"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>cmm_args</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFCallArgs</span> <span class='hs-varid'>stg_args</span>
<a name="line-57"></a> <span class='hs-layout'>;</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>call_args</span><span class='hs-layout'>,</span> <span class='hs-varid'>arg_hints</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cmm_target</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>target</span> <span class='hs-keyword'>of</span>
<a name="line-59"></a> <span class='hs-conid'>StaticTarget</span> <span class='hs-varid'>lbl</span> <span class='hs-keyglyph'>-></span>
<a name="line-60"></a> <span class='hs-layout'>(</span><span class='hs-varid'>unzip</span> <span class='hs-varid'>cmm_args</span><span class='hs-layout'>,</span>
<a name="line-61"></a> <span class='hs-conid'>CmmLit</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLabel</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkForeignLabel</span> <span class='hs-varid'>lbl</span> <span class='hs-layout'>(</span><span class='hs-varid'>call_size</span> <span class='hs-varid'>cmm_args</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-conid'>False</span> <span class='hs-conid'>IsFunction</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-conid'>DynamicTarget</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>cmm_args</span> <span class='hs-keyword'>of</span>
<a name="line-64"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fn</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>unzip</span> <span class='hs-varid'>rest</span><span class='hs-layout'>,</span> <span class='hs-varid'>fn</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>panic</span> <span class='hs-str'>"cgForeignCall []"</span>
<a name="line-66"></a> <span class='hs-varid'>fc</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForeignConvention</span> <span class='hs-varid'>cconv</span> <span class='hs-varid'>arg_hints</span> <span class='hs-varid'>result_hints</span>
<a name="line-67"></a> <span class='hs-varid'>call_target</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForeignTarget</span> <span class='hs-varid'>cmm_target</span> <span class='hs-varid'>fc</span>
<a name="line-68"></a>
<a name="line-69"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>srt</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getSRTInfo</span> <span class='hs-conid'>NoSRT</span> <span class='hs-comment'>-- SLPJ: Not sure what SRT </span>
<a name="line-70"></a> <span class='hs-comment'>-- is right here</span>
<a name="line-71"></a> <span class='hs-comment'>-- JD: Does it matter in the new codegen?</span>
<a name="line-72"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>emitForeignCall</span> <span class='hs-varid'>safety</span> <span class='hs-varid'>results</span> <span class='hs-varid'>call_target</span> <span class='hs-varid'>call_args</span> <span class='hs-varid'>srt</span> <span class='hs-conid'>CmmMayReturn</span> <span class='hs-layout'>}</span>
<a name="line-73"></a> <span class='hs-keyword'>where</span>
<a name="line-74"></a> <span class='hs-comment'>-- in the stdcall calling convention, the symbol needs @size appended</span>
<a name="line-75"></a> <span class='hs-comment'>-- to it, where size is the total number of bytes of arguments. We</span>
<a name="line-76"></a> <span class='hs-comment'>-- attach this info to the CLabel here, and the CLabel pretty printer</span>
<a name="line-77"></a> <span class='hs-comment'>-- will generate the suffix when the label is printed.</span>
<a name="line-78"></a> <span class='hs-varid'>call_size</span> <span class='hs-varid'>args</span>
<a name="line-79"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>StdCallConv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cconv</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>sum</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>arg_size</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-81"></a>
<a name="line-82"></a> <span class='hs-comment'>-- ToDo: this might not be correct for 64-bit API</span>
<a name="line-83"></a> <span class='hs-varid'>arg_size</span> <span class='hs-layout'>(</span><span class='hs-varid'>arg</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-layout'>(</span><span class='hs-varid'>widthInBytes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>typeWidth</span> <span class='hs-varop'>$</span> <span class='hs-varid'>cmmExprType</span> <span class='hs-varid'>arg</span><span class='hs-layout'>)</span> <span class='hs-varid'>wORD_SIZE</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="emitCCall"></a><span class='hs-definition'>emitCCall</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>CmmFormal</span><span class='hs-layout'>,</span><span class='hs-conid'>ForeignHint</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-86"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmExpr</span>
<a name="line-87"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>CmmActual</span><span class='hs-layout'>,</span><span class='hs-conid'>ForeignHint</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-88"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-89"></a><span class='hs-definition'>emitCCall</span> <span class='hs-varid'>hinted_results</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>hinted_args</span>
<a name="line-90"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emitForeignCall</span> <span class='hs-conid'>PlayRisky</span> <span class='hs-varid'>results</span> <span class='hs-varid'>target</span> <span class='hs-varid'>args</span>
<a name="line-91"></a> <span class='hs-conid'>NoC_SRT</span> <span class='hs-comment'>-- No SRT b/c we PlayRisky</span>
<a name="line-92"></a> <span class='hs-conid'>CmmMayReturn</span>
<a name="line-93"></a> <span class='hs-keyword'>where</span>
<a name="line-94"></a> <span class='hs-layout'>(</span><span class='hs-varid'>args</span><span class='hs-layout'>,</span> <span class='hs-varid'>arg_hints</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unzip</span> <span class='hs-varid'>hinted_args</span>
<a name="line-95"></a> <span class='hs-layout'>(</span><span class='hs-varid'>results</span><span class='hs-layout'>,</span> <span class='hs-varid'>result_hints</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unzip</span> <span class='hs-varid'>hinted_results</span>
<a name="line-96"></a> <span class='hs-varid'>target</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForeignTarget</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>fc</span>
<a name="line-97"></a> <span class='hs-varid'>fc</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForeignConvention</span> <span class='hs-conid'>CCallConv</span> <span class='hs-varid'>arg_hints</span> <span class='hs-varid'>result_hints</span>
<a name="line-98"></a>
<a name="line-99"></a>
<a name="line-100"></a><a name="emitPrimCall"></a><span class='hs-definition'>emitPrimCall</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmFormal</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CallishMachOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmActuals</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-101"></a><span class='hs-definition'>emitPrimCall</span> <span class='hs-varid'>res</span> <span class='hs-varid'>op</span> <span class='hs-varid'>args</span>
<a name="line-102"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emitForeignCall</span> <span class='hs-conid'>PlayRisky</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>res</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-conid'>PrimTarget</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span> <span class='hs-conid'>NoC_SRT</span> <span class='hs-conid'>CmmMayReturn</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="emitForeignCall"></a><span class='hs-comment'>-- alternative entry point, used by CmmParse</span>
<a name="line-105"></a><span class='hs-definition'>emitForeignCall</span>
<a name="line-106"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Safety</span>
<a name="line-107"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmFormals</span> <span class='hs-comment'>-- where to put the results</span>
<a name="line-108"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MidCallTarget</span> <span class='hs-comment'>-- the op</span>
<a name="line-109"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmActuals</span> <span class='hs-comment'>-- arguments</span>
<a name="line-110"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>C_SRT</span> <span class='hs-comment'>-- the SRT of the calls continuation</span>
<a name="line-111"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmReturnInfo</span> <span class='hs-comment'>-- This can say "never returns"</span>
<a name="line-112"></a> <span class='hs-comment'>-- only RTS procedures do this</span>
<a name="line-113"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-114"></a><span class='hs-definition'>emitForeignCall</span> <span class='hs-varid'>safety</span> <span class='hs-varid'>results</span> <span class='hs-varid'>target</span> <span class='hs-varid'>args</span> <span class='hs-sel'>_srt</span> <span class='hs-sel'>_ret</span>
<a name="line-115"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>playSafe</span> <span class='hs-varid'>safety</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-116"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>caller_save</span><span class='hs-layout'>,</span> <span class='hs-varid'>caller_load</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>callerSaveVolatileRegs</span>
<a name="line-117"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>caller_save</span>
<a name="line-118"></a> <span class='hs-varid'>emit</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkUnsafeCall</span> <span class='hs-varid'>target</span> <span class='hs-varid'>results</span> <span class='hs-varid'>args</span>
<a name="line-119"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>caller_load</span>
<a name="line-120"></a>
<a name="line-121"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-122"></a> <span class='hs-varid'>updfr_off</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getUpdFrameOff</span>
<a name="line-123"></a> <span class='hs-varid'>temp_target</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>load_target_into_temp</span> <span class='hs-varid'>target</span>
<a name="line-124"></a> <span class='hs-varid'>emit</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkSafeCall</span> <span class='hs-varid'>temp_target</span> <span class='hs-varid'>results</span> <span class='hs-varid'>args</span> <span class='hs-varid'>updfr_off</span>
<a name="line-125"></a>
<a name="line-126"></a>
<a name="line-127"></a><span class='hs-comment'>{-
<a name="line-128"></a>-- THINK ABOUT THIS (used to happen)
<a name="line-129"></a>-- we might need to load arguments into temporaries before
<a name="line-130"></a>-- making the call, because certain global registers might
<a name="line-131"></a>-- overlap with registers that the C calling convention uses
<a name="line-132"></a>-- for passing arguments.
<a name="line-133"></a>--
<a name="line-134"></a>-- This is a HACK; really it should be done in the back end, but
<a name="line-135"></a>-- it's easier to generate the temporaries here.
<a name="line-136"></a>load_args_into_temps = mapM arg_assign_temp
<a name="line-137"></a> where arg_assign_temp (e,hint) = do
<a name="line-138"></a> tmp <- maybe_assign_temp e
<a name="line-139"></a> return (tmp,hint)
<a name="line-140"></a>-}</span>
<a name="line-141"></a>
<a name="line-142"></a><a name="load_target_into_temp"></a><span class='hs-definition'>load_target_into_temp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MidCallTarget</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>MidCallTarget</span>
<a name="line-143"></a><span class='hs-definition'>load_target_into_temp</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForeignTarget</span> <span class='hs-varid'>expr</span> <span class='hs-varid'>conv</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-144"></a> <span class='hs-varid'>tmp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybe_assign_temp</span> <span class='hs-varid'>expr</span>
<a name="line-145"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForeignTarget</span> <span class='hs-varid'>tmp</span> <span class='hs-varid'>conv</span><span class='hs-layout'>)</span>
<a name="line-146"></a><span class='hs-definition'>load_target_into_temp</span> <span class='hs-varid'>other_target</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>PrimTarget</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-147"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>other_target</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="maybe_assign_temp"></a><span class='hs-definition'>maybe_assign_temp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>CmmExpr</span>
<a name="line-150"></a><span class='hs-definition'>maybe_assign_temp</span> <span class='hs-varid'>e</span>
<a name="line-151"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>hasNoGlobalRegs</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>e</span>
<a name="line-152"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-153"></a> <span class='hs-comment'>-- don't use assignTemp, it uses its own notion of "trivial"</span>
<a name="line-154"></a> <span class='hs-comment'>-- expressions, which are wrong here.</span>
<a name="line-155"></a> <span class='hs-comment'>-- this is a NonPtr because it only duplicates an existing</span>
<a name="line-156"></a> <span class='hs-varid'>reg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newTemp</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmExprType</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-comment'>--TODO FIXME NOW</span>
<a name="line-157"></a> <span class='hs-varid'>emit</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkAssign</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLocal</span> <span class='hs-varid'>reg</span><span class='hs-layout'>)</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-158"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmReg</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLocal</span> <span class='hs-varid'>reg</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-159"></a>
<a name="line-160"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-161"></a><span class='hs-comment'>-- Save/restore the thread state in the TSO</span>
<a name="line-162"></a>
<a name="line-163"></a><span class='hs-comment'>-- This stuff can't be done in suspendThread/resumeThread, because it</span>
<a name="line-164"></a><span class='hs-comment'>-- refers to global registers which aren't available in the C world.</span>
<a name="line-165"></a>
<a name="line-166"></a><a name="saveThreadState"></a><span class='hs-definition'>saveThreadState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmAGraph</span>
<a name="line-167"></a><span class='hs-definition'>saveThreadState</span> <span class='hs-keyglyph'>=</span>
<a name="line-168"></a> <span class='hs-comment'>-- CurrentTSO->sp = Sp;</span>
<a name="line-169"></a> <span class='hs-varid'>mkStore</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentTSO</span> <span class='hs-varid'>tso_SP</span><span class='hs-layout'>)</span> <span class='hs-varid'>stgSp</span>
<a name="line-170"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>closeNursery</span>
<a name="line-171"></a> <span class='hs-comment'>-- and save the current cost centre stack in the TSO when profiling:</span>
<a name="line-172"></a> <span class='hs-varop'><*></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>opt_SccProfilingOn</span> <span class='hs-keyword'>then</span>
<a name="line-173"></a> <span class='hs-varid'>mkStore</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentTSO</span> <span class='hs-varid'>tso_CCCS</span><span class='hs-layout'>)</span> <span class='hs-varid'>curCCS</span>
<a name="line-174"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>mkNop</span>
<a name="line-175"></a>
<a name="line-176"></a><a name="emitSaveThreadState"></a><span class='hs-definition'>emitSaveThreadState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BlockId</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-177"></a><span class='hs-definition'>emitSaveThreadState</span> <span class='hs-varid'>bid</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-178"></a> <span class='hs-comment'>-- CurrentTSO->sp = Sp;</span>
<a name="line-179"></a> <span class='hs-varid'>emit</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkStore</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentTSO</span> <span class='hs-varid'>tso_SP</span><span class='hs-layout'>)</span>
<a name="line-180"></a> <span class='hs-layout'>(</span><span class='hs-conid'>CmmStackSlot</span> <span class='hs-layout'>(</span><span class='hs-conid'>CallArea</span> <span class='hs-layout'>(</span><span class='hs-conid'>Young</span> <span class='hs-varid'>bid</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>widthInBytes</span> <span class='hs-layout'>(</span><span class='hs-varid'>typeWidth</span> <span class='hs-varid'>gcWord</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-181"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>closeNursery</span>
<a name="line-182"></a> <span class='hs-comment'>-- and save the current cost centre stack in the TSO when profiling:</span>
<a name="line-183"></a> <span class='hs-varid'>when</span> <span class='hs-varid'>opt_SccProfilingOn</span> <span class='hs-varop'>$</span>
<a name="line-184"></a> <span class='hs-varid'>emit</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkStore</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentTSO</span> <span class='hs-varid'>tso_CCCS</span><span class='hs-layout'>)</span> <span class='hs-varid'>curCCS</span><span class='hs-layout'>)</span>
<a name="line-185"></a>
<a name="line-186"></a> <span class='hs-comment'>-- CurrentNursery->free = Hp+1;</span>
<a name="line-187"></a><a name="closeNursery"></a><span class='hs-definition'>closeNursery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmAGraph</span>
<a name="line-188"></a><span class='hs-definition'>closeNursery</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkStore</span> <span class='hs-varid'>nursery_bdescr_free</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffsetW</span> <span class='hs-varid'>stgHp</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-189"></a>
<a name="line-190"></a><a name="loadThreadState"></a><span class='hs-definition'>loadThreadState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LocalReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmAGraph</span>
<a name="line-191"></a><span class='hs-definition'>loadThreadState</span> <span class='hs-varid'>tso</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-192"></a> <span class='hs-comment'>-- tso <- newTemp gcWord -- TODO FIXME NOW</span>
<a name="line-193"></a> <span class='hs-varid'>catAGraphs</span> <span class='hs-keyglyph'>[</span>
<a name="line-194"></a> <span class='hs-comment'>-- tso = CurrentTSO;</span>
<a name="line-195"></a> <span class='hs-varid'>mkAssign</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLocal</span> <span class='hs-varid'>tso</span><span class='hs-layout'>)</span> <span class='hs-varid'>stgCurrentTSO</span><span class='hs-layout'>,</span>
<a name="line-196"></a> <span class='hs-comment'>-- Sp = tso->sp;</span>
<a name="line-197"></a> <span class='hs-varid'>mkAssign</span> <span class='hs-varid'>sp</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLoad</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmReg</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLocal</span> <span class='hs-varid'>tso</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>tso_SP</span><span class='hs-layout'>)</span>
<a name="line-198"></a> <span class='hs-varid'>bWord</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-199"></a> <span class='hs-comment'>-- SpLim = tso->stack + RESERVED_STACK_WORDS;</span>
<a name="line-200"></a> <span class='hs-varid'>mkAssign</span> <span class='hs-varid'>spLim</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffsetW</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmReg</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLocal</span> <span class='hs-varid'>tso</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>tso_STACK</span><span class='hs-layout'>)</span>
<a name="line-201"></a> <span class='hs-varid'>rESERVED_STACK_WORDS</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-202"></a> <span class='hs-varid'>openNursery</span><span class='hs-layout'>,</span>
<a name="line-203"></a> <span class='hs-comment'>-- and load the current cost centre stack from the TSO when profiling:</span>
<a name="line-204"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>opt_SccProfilingOn</span> <span class='hs-keyword'>then</span>
<a name="line-205"></a> <span class='hs-varid'>mkStore</span> <span class='hs-varid'>curCCSAddr</span>
<a name="line-206"></a> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLoad</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmReg</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLocal</span> <span class='hs-varid'>tso</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>tso_CCCS</span><span class='hs-layout'>)</span> <span class='hs-varid'>ccsType</span><span class='hs-layout'>)</span>
<a name="line-207"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>mkNop</span><span class='hs-keyglyph'>]</span>
<a name="line-208"></a><a name="emitLoadThreadState"></a><span class='hs-definition'>emitLoadThreadState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LocalReg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-209"></a><span class='hs-definition'>emitLoadThreadState</span> <span class='hs-varid'>tso</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-varop'>$</span> <span class='hs-varid'>loadThreadState</span> <span class='hs-varid'>tso</span>
<a name="line-210"></a>
<a name="line-211"></a><a name="openNursery"></a><span class='hs-definition'>openNursery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmAGraph</span>
<a name="line-212"></a><span class='hs-definition'>openNursery</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catAGraphs</span> <span class='hs-keyglyph'>[</span>
<a name="line-213"></a> <span class='hs-comment'>-- Hp = CurrentNursery->free - 1;</span>
<a name="line-214"></a> <span class='hs-varid'>mkAssign</span> <span class='hs-varid'>hp</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffsetW</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLoad</span> <span class='hs-varid'>nursery_bdescr_free</span> <span class='hs-varid'>bWord</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-215"></a>
<a name="line-216"></a> <span class='hs-comment'>-- HpLim = CurrentNursery->start + </span>
<a name="line-217"></a> <span class='hs-comment'>-- CurrentNursery->blocks*BLOCK_SIZE_W - 1;</span>
<a name="line-218"></a> <span class='hs-varid'>mkAssign</span> <span class='hs-varid'>hpLim</span>
<a name="line-219"></a> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffsetExpr</span>
<a name="line-220"></a> <span class='hs-layout'>(</span><span class='hs-conid'>CmmLoad</span> <span class='hs-varid'>nursery_bdescr_start</span> <span class='hs-varid'>bWord</span><span class='hs-layout'>)</span>
<a name="line-221"></a> <span class='hs-layout'>(</span><span class='hs-varid'>cmmOffset</span>
<a name="line-222"></a> <span class='hs-layout'>(</span><span class='hs-conid'>CmmMachOp</span> <span class='hs-varid'>mo_wordMul</span> <span class='hs-keyglyph'>[</span>
<a name="line-223"></a> <span class='hs-conid'>CmmMachOp</span> <span class='hs-layout'>(</span><span class='hs-conid'>MO_SS_Conv</span> <span class='hs-conid'>W32</span> <span class='hs-varid'>wordWidth</span><span class='hs-layout'>)</span>
<a name="line-224"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>CmmLoad</span> <span class='hs-varid'>nursery_bdescr_blocks</span> <span class='hs-varid'>b32</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span>
<a name="line-225"></a> <span class='hs-conid'>CmmLit</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkIntCLit</span> <span class='hs-varid'>bLOCK_SIZE</span><span class='hs-layout'>)</span>
<a name="line-226"></a> <span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-227"></a> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-228"></a> <span class='hs-layout'>)</span>
<a name="line-229"></a> <span class='hs-layout'>)</span>
<a name="line-230"></a> <span class='hs-keyglyph'>]</span>
<a name="line-231"></a><a name="emitOpenNursery"></a><span class='hs-definition'>emitOpenNursery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FCode</span> <span class='hs-conid'>()</span>
<a name="line-232"></a><span class='hs-definition'>emitOpenNursery</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-varid'>openNursery</span>
<a name="line-233"></a>
<a name="line-234"></a><a name="nursery_bdescr_free"></a><span class='hs-definition'>nursery_bdescr_free</span><span class='hs-layout'>,</span> <span class='hs-varid'>nursery_bdescr_start</span><span class='hs-layout'>,</span> <span class='hs-varid'>nursery_bdescr_blocks</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmExpr</span>
<a name="line-235"></a><span class='hs-definition'>nursery_bdescr_free</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentNursery</span> <span class='hs-varid'>oFFSET_bdescr_free</span>
<a name="line-236"></a><a name="nursery_bdescr_start"></a><span class='hs-definition'>nursery_bdescr_start</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentNursery</span> <span class='hs-varid'>oFFSET_bdescr_start</span>
<a name="line-237"></a><a name="nursery_bdescr_blocks"></a><span class='hs-definition'>nursery_bdescr_blocks</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cmmOffset</span> <span class='hs-varid'>stgCurrentNursery</span> <span class='hs-varid'>oFFSET_bdescr_blocks</span>
<a name="line-238"></a>
<a name="line-239"></a><a name="tso_SP"></a><span class='hs-definition'>tso_SP</span><span class='hs-layout'>,</span> <span class='hs-varid'>tso_STACK</span><span class='hs-layout'>,</span> <span class='hs-varid'>tso_CCCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ByteOff</span>
<a name="line-240"></a><span class='hs-definition'>tso_SP</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tsoFieldB</span> <span class='hs-varid'>oFFSET_StgTSO_sp</span>
<a name="line-241"></a><a name="tso_STACK"></a><span class='hs-definition'>tso_STACK</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tsoFieldB</span> <span class='hs-varid'>oFFSET_StgTSO_stack</span>
<a name="line-242"></a><a name="tso_CCCS"></a><span class='hs-definition'>tso_CCCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tsoProfFieldB</span> <span class='hs-varid'>oFFSET_StgTSO_CCCS</span>
<a name="line-243"></a>
<a name="line-244"></a><a name="tsoFieldB"></a><span class='hs-comment'>-- The TSO struct has a variable header, and an optional StgTSOProfInfo in</span>
<a name="line-245"></a><span class='hs-comment'>-- the middle. The fields we're interested in are after the StgTSOProfInfo.</span>
<a name="line-246"></a><span class='hs-definition'>tsoFieldB</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ByteOff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteOff</span>
<a name="line-247"></a><span class='hs-definition'>tsoFieldB</span> <span class='hs-varid'>off</span>
<a name="line-248"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>opt_SccProfilingOn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off</span> <span class='hs-varop'>+</span> <span class='hs-varid'>sIZEOF_StgTSOProfInfo</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fixedHdrSize</span> <span class='hs-varop'>*</span> <span class='hs-varid'>wORD_SIZE</span>
<a name="line-249"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fixedHdrSize</span> <span class='hs-varop'>*</span> <span class='hs-varid'>wORD_SIZE</span>
<a name="line-250"></a>
<a name="line-251"></a><a name="tsoProfFieldB"></a><span class='hs-definition'>tsoProfFieldB</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ByteOff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteOff</span>
<a name="line-252"></a><span class='hs-definition'>tsoProfFieldB</span> <span class='hs-varid'>off</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fixedHdrSize</span> <span class='hs-varop'>*</span> <span class='hs-varid'>wORD_SIZE</span>
<a name="line-253"></a>
<a name="line-254"></a><a name="stgSp"></a><span class='hs-definition'>stgSp</span><span class='hs-layout'>,</span> <span class='hs-varid'>stgHp</span><span class='hs-layout'>,</span> <span class='hs-varid'>stgCurrentTSO</span><span class='hs-layout'>,</span> <span class='hs-varid'>stgCurrentNursery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmExpr</span>
<a name="line-255"></a><span class='hs-definition'>stgSp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmReg</span> <span class='hs-varid'>sp</span>
<a name="line-256"></a><a name="stgHp"></a><span class='hs-definition'>stgHp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmReg</span> <span class='hs-varid'>hp</span>
<a name="line-257"></a><a name="stgCurrentTSO"></a><span class='hs-definition'>stgCurrentTSO</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmReg</span> <span class='hs-varid'>currentTSO</span>
<a name="line-258"></a><a name="stgCurrentNursery"></a><span class='hs-definition'>stgCurrentNursery</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmReg</span> <span class='hs-varid'>currentNursery</span>
<a name="line-259"></a>
<a name="line-260"></a><a name="sp"></a><span class='hs-definition'>sp</span><span class='hs-layout'>,</span> <span class='hs-varid'>spLim</span><span class='hs-layout'>,</span> <span class='hs-varid'>hp</span><span class='hs-layout'>,</span> <span class='hs-varid'>hpLim</span><span class='hs-layout'>,</span> <span class='hs-varid'>currentTSO</span><span class='hs-layout'>,</span> <span class='hs-varid'>currentNursery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmReg</span>
<a name="line-261"></a><span class='hs-definition'>sp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmGlobal</span> <span class='hs-conid'>Sp</span>
<a name="line-262"></a><a name="spLim"></a><span class='hs-definition'>spLim</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmGlobal</span> <span class='hs-conid'>SpLim</span>
<a name="line-263"></a><a name="hp"></a><span class='hs-definition'>hp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmGlobal</span> <span class='hs-conid'>Hp</span>
<a name="line-264"></a><a name="hpLim"></a><span class='hs-definition'>hpLim</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmGlobal</span> <span class='hs-conid'>HpLim</span>
<a name="line-265"></a><a name="currentTSO"></a><span class='hs-definition'>currentTSO</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmGlobal</span> <span class='hs-conid'>CurrentTSO</span>
<a name="line-266"></a><a name="currentNursery"></a><span class='hs-definition'>currentNursery</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CmmGlobal</span> <span class='hs-conid'>CurrentNursery</span>
<a name="line-267"></a>
<a name="line-268"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-269"></a><span class='hs-comment'>-- For certain types passed to foreign calls, we adjust the actual</span>
<a name="line-270"></a><span class='hs-comment'>-- value passed to the call. For ByteArray#/Array# we pass the</span>
<a name="line-271"></a><span class='hs-comment'>-- address of the actual array, not the address of the heap object.</span>
<a name="line-272"></a>
<a name="line-273"></a><a name="getFCallArgs"></a><span class='hs-definition'>getFCallArgs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>StgArg</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FCode</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>CmmExpr</span><span class='hs-layout'>,</span> <span class='hs-conid'>ForeignHint</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-274"></a><span class='hs-comment'>-- (a) Drop void args</span>
<a name="line-275"></a><span class='hs-comment'>-- (b) Add foreign-call shim code</span>
<a name="line-276"></a><span class='hs-comment'>-- It's (b) that makes this differ from getNonVoidArgAmodes</span>
<a name="line-277"></a>
<a name="line-278"></a><span class='hs-definition'>getFCallArgs</span> <span class='hs-varid'>args</span>
<a name="line-279"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>mb_cmms</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>get</span> <span class='hs-varid'>args</span>
<a name="line-280"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>catMaybes</span> <span class='hs-varid'>mb_cmms</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-281"></a> <span class='hs-keyword'>where</span>
<a name="line-282"></a> <span class='hs-varid'>get</span> <span class='hs-varid'>arg</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isVoidRep</span> <span class='hs-varid'>arg_rep</span>
<a name="line-283"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-284"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-285"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>cmm</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getArgAmode</span> <span class='hs-layout'>(</span><span class='hs-conid'>NonVoid</span> <span class='hs-varid'>arg</span><span class='hs-layout'>)</span>
<a name="line-286"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>add_shim</span> <span class='hs-varid'>arg_ty</span> <span class='hs-varid'>cmm</span><span class='hs-layout'>,</span> <span class='hs-varid'>hint</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-287"></a> <span class='hs-keyword'>where</span>
<a name="line-288"></a> <span class='hs-varid'>arg_ty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>stgArgType</span> <span class='hs-varid'>arg</span>
<a name="line-289"></a> <span class='hs-varid'>arg_rep</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>typePrimRep</span> <span class='hs-varid'>arg_ty</span>
<a name="line-290"></a> <span class='hs-varid'>hint</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>typeForeignHint</span> <span class='hs-varid'>arg_ty</span>
<a name="line-291"></a>
<a name="line-292"></a><a name="add_shim"></a><span class='hs-definition'>add_shim</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmExpr</span>
<a name="line-293"></a><span class='hs-definition'>add_shim</span> <span class='hs-varid'>arg_ty</span> <span class='hs-varid'>expr</span>
<a name="line-294"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>tycon</span> <span class='hs-varop'>==</span> <span class='hs-varid'>arrayPrimTyCon</span> <span class='hs-varop'>||</span> <span class='hs-varid'>tycon</span> <span class='hs-varop'>==</span> <span class='hs-varid'>mutableArrayPrimTyCon</span>
<a name="line-295"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cmmOffsetB</span> <span class='hs-varid'>expr</span> <span class='hs-varid'>arrPtrsHdrSize</span>
<a name="line-296"></a>
<a name="line-297"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>tycon</span> <span class='hs-varop'>==</span> <span class='hs-varid'>byteArrayPrimTyCon</span> <span class='hs-varop'>||</span> <span class='hs-varid'>tycon</span> <span class='hs-varop'>==</span> <span class='hs-varid'>mutableByteArrayPrimTyCon</span>
<a name="line-298"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cmmOffsetB</span> <span class='hs-varid'>expr</span> <span class='hs-varid'>arrWordsHdrSize</span>
<a name="line-299"></a>
<a name="line-300"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expr</span>
<a name="line-301"></a> <span class='hs-keyword'>where</span>
<a name="line-302"></a> <span class='hs-varid'>tycon</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tyConAppTyCon</span> <span class='hs-layout'>(</span><span class='hs-varid'>repType</span> <span class='hs-varid'>arg_ty</span><span class='hs-layout'>)</span>
<a name="line-303"></a> <span class='hs-comment'>-- should be a tycon app, since this is a foreign call</span>
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