1 -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2004-2006
5 -- Parser for concrete Cmm.
7 -----------------------------------------------------------------------------
11 -- The above warning supression flag is a temporary kludge.
12 -- While working on this module you are encouraged to remove it and fix
13 -- any warnings in the module. See
14 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
17 module CmmParse ( parseCmmFile ) where
58 import Data.Char ( ord )
63 ':' { L _ (CmmT_SpecChar ':') }
64 ';' { L _ (CmmT_SpecChar ';') }
65 '{' { L _ (CmmT_SpecChar '{') }
66 '}' { L _ (CmmT_SpecChar '}') }
67 '[' { L _ (CmmT_SpecChar '[') }
68 ']' { L _ (CmmT_SpecChar ']') }
69 '(' { L _ (CmmT_SpecChar '(') }
70 ')' { L _ (CmmT_SpecChar ')') }
71 '=' { L _ (CmmT_SpecChar '=') }
72 '`' { L _ (CmmT_SpecChar '`') }
73 '~' { L _ (CmmT_SpecChar '~') }
74 '/' { L _ (CmmT_SpecChar '/') }
75 '*' { L _ (CmmT_SpecChar '*') }
76 '%' { L _ (CmmT_SpecChar '%') }
77 '-' { L _ (CmmT_SpecChar '-') }
78 '+' { L _ (CmmT_SpecChar '+') }
79 '&' { L _ (CmmT_SpecChar '&') }
80 '^' { L _ (CmmT_SpecChar '^') }
81 '|' { L _ (CmmT_SpecChar '|') }
82 '>' { L _ (CmmT_SpecChar '>') }
83 '<' { L _ (CmmT_SpecChar '<') }
84 ',' { L _ (CmmT_SpecChar ',') }
85 '!' { L _ (CmmT_SpecChar '!') }
87 '..' { L _ (CmmT_DotDot) }
88 '::' { L _ (CmmT_DoubleColon) }
89 '>>' { L _ (CmmT_Shr) }
90 '<<' { L _ (CmmT_Shl) }
91 '>=' { L _ (CmmT_Ge) }
92 '<=' { L _ (CmmT_Le) }
93 '==' { L _ (CmmT_Eq) }
94 '!=' { L _ (CmmT_Ne) }
95 '&&' { L _ (CmmT_BoolAnd) }
96 '||' { L _ (CmmT_BoolOr) }
98 'CLOSURE' { L _ (CmmT_CLOSURE) }
99 'INFO_TABLE' { L _ (CmmT_INFO_TABLE) }
100 'INFO_TABLE_RET'{ L _ (CmmT_INFO_TABLE_RET) }
101 'INFO_TABLE_FUN'{ L _ (CmmT_INFO_TABLE_FUN) }
102 'INFO_TABLE_CONSTR'{ L _ (CmmT_INFO_TABLE_CONSTR) }
103 'INFO_TABLE_SELECTOR'{ L _ (CmmT_INFO_TABLE_SELECTOR) }
104 'else' { L _ (CmmT_else) }
105 'export' { L _ (CmmT_export) }
106 'section' { L _ (CmmT_section) }
107 'align' { L _ (CmmT_align) }
108 'goto' { L _ (CmmT_goto) }
109 'if' { L _ (CmmT_if) }
110 'jump' { L _ (CmmT_jump) }
111 'foreign' { L _ (CmmT_foreign) }
112 'never' { L _ (CmmT_never) }
113 'prim' { L _ (CmmT_prim) }
114 'return' { L _ (CmmT_return) }
115 'returns' { L _ (CmmT_returns) }
116 'import' { L _ (CmmT_import) }
117 'switch' { L _ (CmmT_switch) }
118 'case' { L _ (CmmT_case) }
119 'default' { L _ (CmmT_default) }
120 'bits8' { L _ (CmmT_bits8) }
121 'bits16' { L _ (CmmT_bits16) }
122 'bits32' { L _ (CmmT_bits32) }
123 'bits64' { L _ (CmmT_bits64) }
124 'float32' { L _ (CmmT_float32) }
125 'float64' { L _ (CmmT_float64) }
127 GLOBALREG { L _ (CmmT_GlobalReg $$) }
128 NAME { L _ (CmmT_Name $$) }
129 STRING { L _ (CmmT_String $$) }
130 INT { L _ (CmmT_Int $$) }
131 FLOAT { L _ (CmmT_Float $$) }
133 %monad { P } { >>= } { return }
134 %lexer { cmmlex } { L _ CmmT_EOF }
136 %tokentype { Located CmmToken }
138 -- C-- operator precedences, taken from the C-- spec
139 %right '||' -- non-std extension, called %disjoin in C--
140 %right '&&' -- non-std extension, called %conjoin in C--
142 %nonassoc '>=' '>' '<=' '<' '!=' '=='
154 : {- empty -} { return () }
155 | cmmtop cmm { do $1; $2 }
157 cmmtop :: { ExtCode }
161 | 'CLOSURE' '(' NAME ',' NAME lits ')' ';'
162 { do lits <- sequence $6;
163 staticClosure $3 $5 (map getLit lits) }
165 -- The only static closures in the RTS are dummy closures like
166 -- stg_END_TSO_QUEUE_closure and stg_dummy_ret. We don't need
167 -- to provide the full generality of static closures here.
169 -- * CCS can always be CCS_DONT_CARE
170 -- * closure is always extern
171 -- * payload is always empty
172 -- * we can derive closure and info table labels from a single NAME
174 cmmdata :: { ExtCode }
175 : 'section' STRING '{' statics '}'
176 { do ss <- sequence $4;
177 code (emitData (section $2) (concat ss)) }
179 statics :: { [ExtFCode [CmmStatic]] }
181 | static statics { $1 : $2 }
183 -- Strings aren't used much in the RTS HC code, so it doesn't seem
184 -- worth allowing inline strings. C-- doesn't allow them anyway.
185 static :: { ExtFCode [CmmStatic] }
186 : NAME ':' { return [CmmDataLabel (mkRtsDataLabelFS $1)] }
187 | type expr ';' { do e <- $2;
188 return [CmmStaticLit (getLit e)] }
189 | type ';' { return [CmmUninitialised
190 (machRepByteWidth $1)] }
191 | 'bits8' '[' ']' STRING ';' { return [mkString $4] }
192 | 'bits8' '[' INT ']' ';' { return [CmmUninitialised
194 | typenot8 '[' INT ']' ';' { return [CmmUninitialised
195 (machRepByteWidth $1 *
197 | 'align' INT ';' { return [CmmAlign (fromIntegral $2)] }
198 | 'CLOSURE' '(' NAME lits ')'
199 { do lits <- sequence $4;
200 return $ map CmmStaticLit $
201 mkStaticClosure (mkForeignLabel $3 Nothing True)
202 -- mkForeignLabel because these are only used
203 -- for CHARLIKE and INTLIKE closures in the RTS.
204 dontCareCCS (map getLit lits) [] [] [] }
205 -- arrays of closures required for the CHARLIKE & INTLIKE arrays
207 lits :: { [ExtFCode CmmExpr] }
209 | ',' expr lits { $2 : $3 }
211 cmmproc :: { ExtCode }
212 -- TODO: add real SRT/info tables to parsed Cmm
213 : info maybe_formals_without_kinds maybe_gc_block maybe_frame '{' body '}'
214 { do ((entry_ret_label, info, live, formals, gc_block, frame), stmts) <-
215 getCgStmtsEC' $ loopDecls $ do {
216 (entry_ret_label, info, live) <- $1;
217 formals <- sequence $2;
221 return (entry_ret_label, info, live, formals, gc_block, frame) }
222 blks <- code (cgStmtsToBlocks stmts)
223 code (emitInfoTableAndCode entry_ret_label (CmmInfo gc_block frame info) formals blks) }
225 | info maybe_formals_without_kinds ';'
226 { do (entry_ret_label, info, live) <- $1;
227 formals <- sequence $2;
228 code (emitInfoTableAndCode entry_ret_label (CmmInfo Nothing Nothing info) formals []) }
230 | NAME maybe_formals_without_kinds maybe_gc_block maybe_frame '{' body '}'
231 { do ((formals, gc_block, frame), stmts) <-
232 getCgStmtsEC' $ loopDecls $ do {
233 formals <- sequence $2;
237 return (formals, gc_block, frame) }
238 blks <- code (cgStmtsToBlocks stmts)
239 code (emitProc (CmmInfo gc_block frame CmmNonInfoTable) (mkRtsCodeLabelFS $1) formals blks) }
241 info :: { ExtFCode (CLabel, CmmInfoTable, [Maybe LocalReg]) }
242 : 'INFO_TABLE' '(' NAME ',' INT ',' INT ',' INT ',' STRING ',' STRING ')'
243 -- ptrs, nptrs, closure type, description, type
244 { do prof <- profilingInfo $11 $13
245 return (mkRtsEntryLabelFS $3,
246 CmmInfoTable prof (fromIntegral $9)
247 (ThunkInfo (fromIntegral $5, fromIntegral $7) NoC_SRT),
250 | 'INFO_TABLE_FUN' '(' NAME ',' INT ',' INT ',' INT ',' STRING ',' STRING ',' INT ')'
251 -- ptrs, nptrs, closure type, description, type, fun type
252 { do prof <- profilingInfo $11 $13
253 return (mkRtsEntryLabelFS $3,
254 CmmInfoTable prof (fromIntegral $9)
255 (FunInfo (fromIntegral $5, fromIntegral $7) NoC_SRT (fromIntegral $15) 0
259 -- we leave most of the fields zero here. This is only used
260 -- to generate the BCO info table in the RTS at the moment.
262 -- A variant with a non-zero arity (needed to write Main_main in Cmm)
263 | 'INFO_TABLE_FUN' '(' NAME ',' INT ',' INT ',' INT ',' STRING ',' STRING ',' INT ',' INT ')'
264 -- ptrs, nptrs, closure type, description, type, fun type, arity
265 { do prof <- profilingInfo $11 $13
266 return (mkRtsEntryLabelFS $3,
267 CmmInfoTable prof (fromIntegral $9)
268 (FunInfo (fromIntegral $5, fromIntegral $7) NoC_SRT (fromIntegral $15) (fromIntegral $17)
272 -- we leave most of the fields zero here. This is only used
273 -- to generate the BCO info table in the RTS at the moment.
275 | 'INFO_TABLE_CONSTR' '(' NAME ',' INT ',' INT ',' INT ',' INT ',' STRING ',' STRING ')'
276 -- ptrs, nptrs, tag, closure type, description, type
277 { do prof <- profilingInfo $13 $15
278 -- If profiling is on, this string gets duplicated,
279 -- but that's the way the old code did it we can fix it some other time.
280 desc_lit <- code $ mkStringCLit $13
281 return (mkRtsEntryLabelFS $3,
282 CmmInfoTable prof (fromIntegral $11)
283 (ConstrInfo (fromIntegral $5, fromIntegral $7) (fromIntegral $9) desc_lit),
286 | 'INFO_TABLE_SELECTOR' '(' NAME ',' INT ',' INT ',' STRING ',' STRING ')'
287 -- selector, closure type, description, type
288 { do prof <- profilingInfo $9 $11
289 return (mkRtsEntryLabelFS $3,
290 CmmInfoTable prof (fromIntegral $7)
291 (ThunkSelectorInfo (fromIntegral $5) NoC_SRT),
294 | 'INFO_TABLE_RET' '(' NAME ',' INT ')'
295 -- closure type (no live regs)
296 { do let infoLabel = mkRtsInfoLabelFS $3
297 return (mkRtsRetLabelFS $3,
298 CmmInfoTable (ProfilingInfo zeroCLit zeroCLit) (fromIntegral $5)
299 (ContInfo [] NoC_SRT),
302 | 'INFO_TABLE_RET' '(' NAME ',' INT ',' formals_without_kinds0 ')'
303 -- closure type, live regs
304 { do live <- sequence (map (liftM Just) $7)
305 return (mkRtsRetLabelFS $3,
306 CmmInfoTable (ProfilingInfo zeroCLit zeroCLit) (fromIntegral $5)
307 (ContInfo live NoC_SRT),
311 : {- empty -} { return () }
312 | decl body { do $1; $2 }
313 | stmt body { do $1; $2 }
316 : type names ';' { mapM_ (newLocal defaultKind $1) $2 }
317 | STRING type names ';' {% do k <- parseGCKind $1;
318 return $ mapM_ (newLocal k $2) $3 }
320 | 'import' names ';' { mapM_ newImport $2 }
321 | 'export' names ';' { return () } -- ignore exports
323 names :: { [FastString] }
325 | NAME ',' names { $1 : $3 }
331 { do l <- newLabel $1; code (labelC l) }
334 { do reg <- $1; e <- $3; stmtEC (CmmAssign reg e) }
335 | type '[' expr ']' '=' expr ';'
338 -- Gah! We really want to say "maybe_results" but that causes
339 -- a shift/reduce conflict with assignment. We either
340 -- we expand out the no-result and single result cases or
341 -- we tweak the syntax to avoid the conflict. The later
342 -- option is taken here because the other way would require
343 -- multiple levels of expanding and get unwieldy.
344 | maybe_results 'foreign' STRING expr '(' cmm_kind_exprs0 ')' safety vols opt_never_returns ';'
345 {% foreignCall $3 $1 $4 $6 $9 $8 $10 }
346 | maybe_results 'prim' '%' NAME '(' cmm_kind_exprs0 ')' safety vols ';'
347 {% primCall $1 $4 $6 $9 $8 }
348 -- stmt-level macros, stealing syntax from ordinary C-- function calls.
349 -- Perhaps we ought to use the %%-form?
350 | NAME '(' exprs0 ')' ';'
352 | 'switch' maybe_range expr '{' arms default '}'
353 { doSwitch $2 $3 $5 $6 }
355 { do l <- lookupLabel $2; stmtEC (CmmBranch l) }
356 | 'jump' expr maybe_actuals ';'
357 { do e1 <- $2; e2 <- sequence $3; stmtEC (CmmJump e1 e2) }
358 | 'return' maybe_actuals ';'
359 { do e <- sequence $2; stmtEC (CmmReturn e) }
360 | 'if' bool_expr '{' body '}' else
361 { ifThenElse $2 $4 $6 }
363 opt_never_returns :: { CmmReturnInfo }
365 | 'never' 'returns' { CmmNeverReturns }
367 bool_expr :: { ExtFCode BoolExpr }
369 | expr { do e <- $1; return (BoolTest e) }
371 bool_op :: { ExtFCode BoolExpr }
372 : bool_expr '&&' bool_expr { do e1 <- $1; e2 <- $3;
373 return (BoolAnd e1 e2) }
374 | bool_expr '||' bool_expr { do e1 <- $1; e2 <- $3;
375 return (BoolOr e1 e2) }
376 | '!' bool_expr { do e <- $2; return (BoolNot e) }
377 | '(' bool_op ')' { $2 }
379 -- This is not C-- syntax. What to do?
380 safety :: { CmmSafety }
381 : {- empty -} { CmmUnsafe } -- Default may change soon
382 | STRING {% parseSafety $1 }
384 -- This is not C-- syntax. What to do?
385 vols :: { Maybe [GlobalReg] }
386 : {- empty -} { Nothing }
387 | '[' ']' { Just [] }
388 | '[' globals ']' { Just $2 }
390 globals :: { [GlobalReg] }
392 | GLOBALREG ',' globals { $1 : $3 }
394 maybe_range :: { Maybe (Int,Int) }
395 : '[' INT '..' INT ']' { Just (fromIntegral $2, fromIntegral $4) }
396 | {- empty -} { Nothing }
398 arms :: { [([Int],ExtCode)] }
400 | arm arms { $1 : $2 }
402 arm :: { ([Int],ExtCode) }
403 : 'case' ints ':' '{' body '}' { ($2, $5) }
406 : INT { [ fromIntegral $1 ] }
407 | INT ',' ints { fromIntegral $1 : $3 }
409 default :: { Maybe ExtCode }
410 : 'default' ':' '{' body '}' { Just $4 }
411 -- taking a few liberties with the C-- syntax here; C-- doesn't have
412 -- 'default' branches
413 | {- empty -} { Nothing }
416 : {- empty -} { nopEC }
417 | 'else' '{' body '}' { $3 }
419 -- we have to write this out longhand so that Happy's precedence rules
421 expr :: { ExtFCode CmmExpr }
422 : expr '/' expr { mkMachOp MO_U_Quot [$1,$3] }
423 | expr '*' expr { mkMachOp MO_Mul [$1,$3] }
424 | expr '%' expr { mkMachOp MO_U_Rem [$1,$3] }
425 | expr '-' expr { mkMachOp MO_Sub [$1,$3] }
426 | expr '+' expr { mkMachOp MO_Add [$1,$3] }
427 | expr '>>' expr { mkMachOp MO_U_Shr [$1,$3] }
428 | expr '<<' expr { mkMachOp MO_Shl [$1,$3] }
429 | expr '&' expr { mkMachOp MO_And [$1,$3] }
430 | expr '^' expr { mkMachOp MO_Xor [$1,$3] }
431 | expr '|' expr { mkMachOp MO_Or [$1,$3] }
432 | expr '>=' expr { mkMachOp MO_U_Ge [$1,$3] }
433 | expr '>' expr { mkMachOp MO_U_Gt [$1,$3] }
434 | expr '<=' expr { mkMachOp MO_U_Le [$1,$3] }
435 | expr '<' expr { mkMachOp MO_U_Lt [$1,$3] }
436 | expr '!=' expr { mkMachOp MO_Ne [$1,$3] }
437 | expr '==' expr { mkMachOp MO_Eq [$1,$3] }
438 | '~' expr { mkMachOp MO_Not [$2] }
439 | '-' expr { mkMachOp MO_S_Neg [$2] }
440 | expr0 '`' NAME '`' expr0 {% do { mo <- nameToMachOp $3 ;
441 return (mkMachOp mo [$1,$5]) } }
444 expr0 :: { ExtFCode CmmExpr }
445 : INT maybe_ty { return (CmmLit (CmmInt $1 $2)) }
446 | FLOAT maybe_ty { return (CmmLit (CmmFloat $1 $2)) }
447 | STRING { do s <- code (mkStringCLit $1);
450 | type '[' expr ']' { do e <- $3; return (CmmLoad e $1) }
451 | '%' NAME '(' exprs0 ')' {% exprOp $2 $4 }
452 | '(' expr ')' { $2 }
455 -- leaving out the type of a literal gives you the native word size in C--
456 maybe_ty :: { MachRep }
457 : {- empty -} { wordRep }
460 maybe_actuals :: { [ExtFCode CmmActual] }
462 | '(' cmm_kind_exprs0 ')' { $2 }
464 cmm_kind_exprs0 :: { [ExtFCode CmmActual] }
466 | cmm_kind_exprs { $1 }
468 cmm_kind_exprs :: { [ExtFCode CmmActual] }
469 : cmm_kind_expr { [$1] }
470 | cmm_kind_expr ',' cmm_kind_exprs { $1 : $3 }
472 cmm_kind_expr :: { ExtFCode CmmActual }
473 : expr { do e <- $1; return (CmmHinted e (inferCmmKind e)) }
474 | expr STRING {% do h <- parseCmmKind $2;
476 e <- $1; return (CmmHinted e h) }
478 exprs0 :: { [ExtFCode CmmExpr] }
482 exprs :: { [ExtFCode CmmExpr] }
484 | expr ',' exprs { $1 : $3 }
486 reg :: { ExtFCode CmmExpr }
487 : NAME { lookupName $1 }
488 | GLOBALREG { return (CmmReg (CmmGlobal $1)) }
490 maybe_results :: { [ExtFCode CmmFormal] }
492 | '(' cmm_formals ')' '=' { $2 }
494 cmm_formals :: { [ExtFCode CmmFormal] }
495 : cmm_formal { [$1] }
496 | cmm_formal ',' { [$1] }
497 | cmm_formal ',' cmm_formals { $1 : $3 }
499 cmm_formal :: { ExtFCode CmmFormal }
500 : local_lreg { do e <- $1; return (CmmHinted e (inferCmmKind (CmmReg (CmmLocal e)))) }
501 | STRING local_lreg {% do h <- parseCmmKind $1;
503 e <- $2; return (CmmHinted e h) }
505 local_lreg :: { ExtFCode LocalReg }
506 : NAME { do e <- lookupName $1;
509 CmmReg (CmmLocal r) -> r
510 other -> pprPanic "CmmParse:" (ftext $1 <> text " not a local register") }
512 lreg :: { ExtFCode CmmReg }
513 : NAME { do e <- lookupName $1;
517 other -> pprPanic "CmmParse:" (ftext $1 <> text " not a register") }
518 | GLOBALREG { return (CmmGlobal $1) }
520 maybe_formals_without_kinds :: { [ExtFCode LocalReg] }
522 | '(' formals_without_kinds0 ')' { $2 }
524 formals_without_kinds0 :: { [ExtFCode LocalReg] }
526 | formals_without_kinds { $1 }
528 formals_without_kinds :: { [ExtFCode LocalReg] }
529 : formal_without_kind ',' { [$1] }
530 | formal_without_kind { [$1] }
531 | formal_without_kind ',' formals_without_kinds { $1 : $3 }
533 formal_without_kind :: { ExtFCode LocalReg }
534 : type NAME { newLocal defaultKind $1 $2 }
535 | STRING type NAME {% do k <- parseGCKind $1;
536 return $ newLocal k $2 $3 }
538 maybe_frame :: { ExtFCode (Maybe UpdateFrame) }
539 : {- empty -} { return Nothing }
540 | 'jump' expr '(' exprs0 ')' { do { target <- $2;
542 return $ Just (UpdateFrame target args) } }
544 maybe_gc_block :: { ExtFCode (Maybe BlockId) }
545 : {- empty -} { return Nothing }
547 { do l <- lookupLabel $2; return (Just l) }
553 typenot8 :: { MachRep }
560 section :: String -> Section
561 section "text" = Text
562 section "data" = Data
563 section "rodata" = ReadOnlyData
564 section "relrodata" = RelocatableReadOnlyData
565 section "bss" = UninitialisedData
566 section s = OtherSection s
568 mkString :: String -> CmmStatic
569 mkString s = CmmString (map (fromIntegral.ord) s)
571 -- mkMachOp infers the type of the MachOp from the type of its first
572 -- argument. We assume that this is correct: for MachOps that don't have
573 -- symmetrical args (e.g. shift ops), the first arg determines the type of
575 mkMachOp :: (MachRep -> MachOp) -> [ExtFCode CmmExpr] -> ExtFCode CmmExpr
576 mkMachOp fn args = do
577 arg_exprs <- sequence args
578 return (CmmMachOp (fn (cmmExprRep (head arg_exprs))) arg_exprs)
580 getLit :: CmmExpr -> CmmLit
581 getLit (CmmLit l) = l
582 getLit (CmmMachOp (MO_S_Neg _) [CmmLit (CmmInt i r)]) = CmmInt (negate i) r
583 getLit _ = panic "invalid literal" -- TODO messy failure
585 nameToMachOp :: FastString -> P (MachRep -> MachOp)
587 case lookupUFM machOps name of
588 Nothing -> fail ("unknown primitive " ++ unpackFS name)
591 exprOp :: FastString -> [ExtFCode CmmExpr] -> P (ExtFCode CmmExpr)
592 exprOp name args_code =
593 case lookupUFM exprMacros name of
594 Just f -> return $ do
595 args <- sequence args_code
598 mo <- nameToMachOp name
599 return $ mkMachOp mo args_code
601 exprMacros :: UniqFM ([CmmExpr] -> CmmExpr)
602 exprMacros = listToUFM [
603 ( fsLit "ENTRY_CODE", \ [x] -> entryCode x ),
604 ( fsLit "INFO_PTR", \ [x] -> closureInfoPtr x ),
605 ( fsLit "STD_INFO", \ [x] -> infoTable x ),
606 ( fsLit "FUN_INFO", \ [x] -> funInfoTable x ),
607 ( fsLit "GET_ENTRY", \ [x] -> entryCode (closureInfoPtr x) ),
608 ( fsLit "GET_STD_INFO", \ [x] -> infoTable (closureInfoPtr x) ),
609 ( fsLit "GET_FUN_INFO", \ [x] -> funInfoTable (closureInfoPtr x) ),
610 ( fsLit "INFO_TYPE", \ [x] -> infoTableClosureType x ),
611 ( fsLit "INFO_PTRS", \ [x] -> infoTablePtrs x ),
612 ( fsLit "INFO_NPTRS", \ [x] -> infoTableNonPtrs x )
615 -- we understand a subset of C-- primitives:
616 machOps = listToUFM $
617 map (\(x, y) -> (mkFastString x, y)) [
624 ( "quot", MO_S_Quot ),
626 ( "divu", MO_U_Quot ),
627 ( "modu", MO_U_Rem ),
645 ( "fneg", MO_S_Neg ),
652 ( "shrl", MO_U_Shr ),
653 ( "shra", MO_S_Shr ),
655 ( "lobits8", flip MO_U_Conv I8 ),
656 ( "lobits16", flip MO_U_Conv I16 ),
657 ( "lobits32", flip MO_U_Conv I32 ),
658 ( "lobits64", flip MO_U_Conv I64 ),
659 ( "sx16", flip MO_S_Conv I16 ),
660 ( "sx32", flip MO_S_Conv I32 ),
661 ( "sx64", flip MO_S_Conv I64 ),
662 ( "zx16", flip MO_U_Conv I16 ),
663 ( "zx32", flip MO_U_Conv I32 ),
664 ( "zx64", flip MO_U_Conv I64 ),
665 ( "f2f32", flip MO_S_Conv F32 ), -- TODO; rounding mode
666 ( "f2f64", flip MO_S_Conv F64 ), -- TODO; rounding mode
667 ( "f2i8", flip MO_S_Conv I8 ),
668 ( "f2i16", flip MO_S_Conv I16 ),
669 ( "f2i32", flip MO_S_Conv I32 ),
670 ( "f2i64", flip MO_S_Conv I64 ),
671 ( "i2f32", flip MO_S_Conv F32 ),
672 ( "i2f64", flip MO_S_Conv F64 )
675 callishMachOps = listToUFM $
676 map (\(x, y) -> (mkFastString x, y)) [
677 ( "write_barrier", MO_WriteBarrier )
678 -- ToDo: the rest, maybe
681 parseSafety :: String -> P CmmSafety
682 parseSafety "safe" = return (CmmSafe NoC_SRT)
683 parseSafety "unsafe" = return CmmUnsafe
684 parseSafety str = fail ("unrecognised safety: " ++ str)
686 parseCmmKind :: String -> P CmmKind
687 parseCmmKind "ptr" = return PtrHint
688 parseCmmKind "signed" = return SignedHint
689 parseCmmKind "float" = return FloatHint
690 parseCmmKind str = fail ("unrecognised hint: " ++ str)
692 parseGCKind :: String -> P GCKind
693 parseGCKind "ptr" = return GCKindPtr
694 parseGCKind str = fail ("unrecognized kin: " ++ str)
696 defaultKind :: GCKind
697 defaultKind = GCKindNonPtr
699 -- labels are always pointers, so we might as well infer the hint
700 inferCmmKind :: CmmExpr -> CmmKind
701 inferCmmKind (CmmLit (CmmLabel _)) = PtrHint
702 inferCmmKind (CmmReg (CmmGlobal g)) | isPtrGlobalReg g = PtrHint
703 inferCmmKind _ = NoHint
705 isPtrGlobalReg Sp = True
706 isPtrGlobalReg SpLim = True
707 isPtrGlobalReg Hp = True
708 isPtrGlobalReg HpLim = True
709 isPtrGlobalReg CurrentTSO = True
710 isPtrGlobalReg CurrentNursery = True
711 isPtrGlobalReg _ = False
714 happyError = srcParseFail
716 -- -----------------------------------------------------------------------------
717 -- Statement-level macros
719 stmtMacro :: FastString -> [ExtFCode CmmExpr] -> P ExtCode
720 stmtMacro fun args_code = do
721 case lookupUFM stmtMacros fun of
722 Nothing -> fail ("unknown macro: " ++ unpackFS fun)
723 Just fcode -> return $ do
724 args <- sequence args_code
727 stmtMacros :: UniqFM ([CmmExpr] -> Code)
728 stmtMacros = listToUFM [
729 ( fsLit "CCS_ALLOC", \[words,ccs] -> profAlloc words ccs ),
730 ( fsLit "CLOSE_NURSERY", \[] -> emitCloseNursery ),
731 ( fsLit "ENTER_CCS_PAP_CL", \[e] -> enterCostCentrePAP e ),
732 ( fsLit "ENTER_CCS_THUNK", \[e] -> enterCostCentreThunk e ),
733 ( fsLit "HP_CHK_GEN", \[words,liveness,reentry] ->
734 hpChkGen words liveness reentry ),
735 ( fsLit "HP_CHK_NP_ASSIGN_SP0", \[e,f] -> hpChkNodePointsAssignSp0 e f ),
736 ( fsLit "LOAD_THREAD_STATE", \[] -> emitLoadThreadState ),
737 ( fsLit "LDV_ENTER", \[e] -> ldvEnter e ),
738 ( fsLit "LDV_RECORD_CREATE", \[e] -> ldvRecordCreate e ),
739 ( fsLit "OPEN_NURSERY", \[] -> emitOpenNursery ),
740 ( fsLit "PUSH_UPD_FRAME", \[sp,e] -> emitPushUpdateFrame sp e ),
741 ( fsLit "SAVE_THREAD_STATE", \[] -> emitSaveThreadState ),
742 ( fsLit "SET_HDR", \[ptr,info,ccs] ->
743 emitSetDynHdr ptr info ccs ),
744 ( fsLit "STK_CHK_GEN", \[words,liveness,reentry] ->
745 stkChkGen words liveness reentry ),
746 ( fsLit "STK_CHK_NP", \[e] -> stkChkNodePoints e ),
747 ( fsLit "TICK_ALLOC_PRIM", \[hdr,goods,slop] ->
748 tickyAllocPrim hdr goods slop ),
749 ( fsLit "TICK_ALLOC_PAP", \[goods,slop] ->
750 tickyAllocPAP goods slop ),
751 ( fsLit "TICK_ALLOC_UP_THK", \[goods,slop] ->
752 tickyAllocThunk goods slop ),
753 ( fsLit "UPD_BH_UPDATABLE", \[] -> emitBlackHoleCode False ),
754 ( fsLit "UPD_BH_SINGLE_ENTRY", \[] -> emitBlackHoleCode True ),
756 ( fsLit "RET_P", \[a] -> emitRetUT [(PtrArg,a)]),
757 ( fsLit "RET_N", \[a] -> emitRetUT [(NonPtrArg,a)]),
758 ( fsLit "RET_PP", \[a,b] -> emitRetUT [(PtrArg,a),(PtrArg,b)]),
759 ( fsLit "RET_NN", \[a,b] -> emitRetUT [(NonPtrArg,a),(NonPtrArg,b)]),
760 ( fsLit "RET_NP", \[a,b] -> emitRetUT [(NonPtrArg,a),(PtrArg,b)]),
761 ( fsLit "RET_PPP", \[a,b,c] -> emitRetUT [(PtrArg,a),(PtrArg,b),(PtrArg,c)]),
762 ( fsLit "RET_NPP", \[a,b,c] -> emitRetUT [(NonPtrArg,a),(PtrArg,b),(PtrArg,c)]),
763 ( fsLit "RET_NNP", \[a,b,c] -> emitRetUT [(NonPtrArg,a),(NonPtrArg,b),(PtrArg,c)]),
764 ( fsLit "RET_NNN", \[a,b,c] -> emitRetUT [(NonPtrArg,a),(NonPtrArg,b),(NonPtrArg,c)]),
765 ( fsLit "RET_NNNP", \[a,b,c,d] -> emitRetUT [(NonPtrArg,a),(NonPtrArg,b),(NonPtrArg,c),(PtrArg,d)]),
766 ( fsLit "RET_NPNP", \[a,b,c,d] -> emitRetUT [(NonPtrArg,a),(PtrArg,b),(NonPtrArg,c),(PtrArg,d)])
770 -- -----------------------------------------------------------------------------
771 -- Our extended FCode monad.
773 -- We add a mapping from names to CmmExpr, to support local variable names in
774 -- the concrete C-- code. The unique supply of the underlying FCode monad
775 -- is used to grab a new unique for each local variable.
777 -- In C--, a local variable can be declared anywhere within a proc,
778 -- and it scopes from the beginning of the proc to the end. Hence, we have
779 -- to collect declarations as we parse the proc, and feed the environment
780 -- back in circularly (to avoid a two-pass algorithm).
782 data Named = Var CmmExpr | Label BlockId
783 type Decls = [(FastString,Named)]
784 type Env = UniqFM Named
786 newtype ExtFCode a = EC { unEC :: Env -> Decls -> FCode (Decls, a) }
788 type ExtCode = ExtFCode ()
790 returnExtFC a = EC $ \e s -> return (s, a)
791 thenExtFC (EC m) k = EC $ \e s -> do (s',r) <- m e s; unEC (k r) e s'
793 instance Monad ExtFCode where
797 -- This function takes the variable decarations and imports and makes
798 -- an environment, which is looped back into the computation. In this
799 -- way, we can have embedded declarations that scope over the whole
800 -- procedure, and imports that scope over the entire module.
801 -- Discards the local declaration contained within decl'
802 loopDecls :: ExtFCode a -> ExtFCode a
803 loopDecls (EC fcode) =
804 EC $ \e globalDecls -> do
805 (decls', a) <- fixC (\ ~(decls,a) -> fcode (addListToUFM e (decls ++ globalDecls)) globalDecls)
806 return (globalDecls, a)
808 getEnv :: ExtFCode Env
809 getEnv = EC $ \e s -> return (s, e)
811 addVarDecl :: FastString -> CmmExpr -> ExtCode
812 addVarDecl var expr = EC $ \e s -> return ((var, Var expr):s, ())
814 addLabel :: FastString -> BlockId -> ExtCode
815 addLabel name block_id = EC $ \e s -> return ((name, Label block_id):s, ())
817 newLocal :: GCKind -> MachRep -> FastString -> ExtFCode LocalReg
818 newLocal kind ty name = do
820 let reg = LocalReg u ty kind
821 addVarDecl name (CmmReg (CmmLocal reg))
824 -- Creates a foreign label in the import. CLabel's labelDynamic
825 -- classifies these labels as dynamic, hence the code generator emits the
826 -- PIC code for them.
827 newImport :: FastString -> ExtFCode ()
829 = addVarDecl name (CmmLit (CmmLabel (mkForeignLabel name Nothing True)))
831 newLabel :: FastString -> ExtFCode BlockId
834 addLabel name (BlockId u)
837 lookupLabel :: FastString -> ExtFCode BlockId
838 lookupLabel name = do
841 case lookupUFM env name of
843 _other -> BlockId (newTagUnique (getUnique name) 'L')
845 -- Unknown names are treated as if they had been 'import'ed.
846 -- This saves us a lot of bother in the RTS sources, at the expense of
847 -- deferring some errors to link time.
848 lookupName :: FastString -> ExtFCode CmmExpr
852 case lookupUFM env name of
854 _other -> CmmLit (CmmLabel (mkRtsCodeLabelFS name))
856 -- Lifting FCode computations into the ExtFCode monad:
857 code :: FCode a -> ExtFCode a
858 code fc = EC $ \e s -> do r <- fc; return (s, r)
860 code2 :: (FCode (Decls,b) -> FCode ((Decls,b),c))
861 -> ExtFCode b -> ExtFCode c
862 code2 f (EC ec) = EC $ \e s -> do ((s',b),c) <- f (ec e s); return (s',c)
865 stmtEC stmt = code (stmtC stmt)
866 stmtsEC stmts = code (stmtsC stmts)
867 getCgStmtsEC = code2 getCgStmts'
868 getCgStmtsEC' = code2 (\m -> getCgStmts' m >>= f)
869 where f ((decl, b), c) = return ((decl, b), (b, c))
871 forkLabelledCodeEC ec = do
872 stmts <- getCgStmtsEC ec
873 code (forkCgStmts stmts)
876 profilingInfo desc_str ty_str = do
877 lit1 <- if opt_SccProfilingOn
878 then code $ mkStringCLit desc_str
879 else return (mkIntCLit 0)
880 lit2 <- if opt_SccProfilingOn
881 then code $ mkStringCLit ty_str
882 else return (mkIntCLit 0)
883 return (ProfilingInfo lit1 lit2)
886 staticClosure :: FastString -> FastString -> [CmmLit] -> ExtCode
887 staticClosure cl_label info payload
888 = code $ emitDataLits (mkRtsDataLabelFS cl_label) lits
889 where lits = mkStaticClosure (mkRtsInfoLabelFS info) dontCareCCS payload [] [] []
893 -> [ExtFCode CmmFormal]
895 -> [ExtFCode CmmActual]
900 foreignCall conv_string results_code expr_code args_code vols safety ret
901 = do convention <- case conv_string of
902 "C" -> return CCallConv
903 "stdcall" -> return StdCallConv
904 "C--" -> return CmmCallConv
905 _ -> fail ("unknown calling convention: " ++ conv_string)
907 results <- sequence results_code
909 args <- sequence args_code
910 --code (stmtC (CmmCall (CmmCallee expr convention) results args safety))
912 -- Temporary hack so at least some functions are CmmSafe
913 CmmCallConv -> code (stmtC (CmmCall (CmmCallee expr convention) results args safety ret))
915 let expr' = adjCallTarget convention expr args in
918 code (emitForeignCall' PlayRisky results
919 (CmmCallee expr' convention) args vols NoC_SRT ret)
921 code (emitForeignCall' (PlaySafe unused) results
922 (CmmCallee expr' convention) args vols NoC_SRT ret) where
923 unused = panic "not used by emitForeignCall'"
925 adjCallTarget :: CCallConv -> CmmExpr -> [CmmHinted CmmExpr] -> CmmExpr
926 #ifdef mingw32_TARGET_OS
927 -- On Windows, we have to add the '@N' suffix to the label when making
928 -- a call with the stdcall calling convention.
929 adjCallTarget StdCallConv (CmmLit (CmmLabel lbl)) args
930 = CmmLit (CmmLabel (addLabelSize lbl (sum (map size args))))
931 where size (CmmHinted e _) = max wORD_SIZE (machRepByteWidth (cmmExprRep e))
932 -- c.f. CgForeignCall.emitForeignCall
934 adjCallTarget _ expr _
938 :: [ExtFCode CmmFormal]
940 -> [ExtFCode CmmActual]
944 primCall results_code name args_code vols safety
945 = case lookupUFM callishMachOps name of
946 Nothing -> fail ("unknown primitive " ++ unpackFS name)
947 Just p -> return $ do
948 results <- sequence results_code
949 args <- sequence args_code
952 code (emitForeignCall' PlayRisky results
953 (CmmPrim p) args vols NoC_SRT CmmMayReturn)
955 code (emitForeignCall' (PlaySafe unused) results
956 (CmmPrim p) args vols NoC_SRT CmmMayReturn) where
957 unused = panic "not used by emitForeignCall'"
959 doStore :: MachRep -> ExtFCode CmmExpr -> ExtFCode CmmExpr -> ExtCode
960 doStore rep addr_code val_code
961 = do addr <- addr_code
963 -- if the specified store type does not match the type of the expr
964 -- on the rhs, then we insert a coercion that will cause the type
965 -- mismatch to be flagged by cmm-lint. If we don't do this, then
966 -- the store will happen at the wrong type, and the error will not
969 | cmmExprRep val /= rep = CmmMachOp (MO_U_Conv rep rep) [val]
971 stmtEC (CmmStore addr coerce_val)
973 -- Return an unboxed tuple.
974 emitRetUT :: [(CgRep,CmmExpr)] -> Code
976 tickyUnboxedTupleReturn (length args) -- TICK
977 (sp, stmts) <- pushUnboxedTuple 0 args
979 when (sp /= 0) $ stmtC (CmmAssign spReg (cmmRegOffW spReg (-sp)))
980 stmtC (CmmJump (entryCode (CmmLoad (cmmRegOffW spReg sp) wordRep)) [])
981 -- TODO (when using CPS): emitStmt (CmmReturn (map snd args))
983 -- -----------------------------------------------------------------------------
984 -- If-then-else and boolean expressions
987 = BoolExpr `BoolAnd` BoolExpr
988 | BoolExpr `BoolOr` BoolExpr
992 -- ToDo: smart constructors which simplify the boolean expression.
994 ifThenElse cond then_part else_part = do
995 then_id <- code newLabelC
996 join_id <- code newLabelC
1000 stmtEC (CmmBranch join_id)
1001 code (labelC then_id)
1003 -- fall through to join
1004 code (labelC join_id)
1006 -- 'emitCond cond true_id' emits code to test whether the cond is true,
1007 -- branching to true_id if so, and falling through otherwise.
1008 emitCond (BoolTest e) then_id = do
1009 stmtEC (CmmCondBranch e then_id)
1010 emitCond (BoolNot (BoolTest (CmmMachOp op args))) then_id
1011 | Just op' <- maybeInvertComparison op
1012 = emitCond (BoolTest (CmmMachOp op' args)) then_id
1013 emitCond (BoolNot e) then_id = do
1014 else_id <- code newLabelC
1016 stmtEC (CmmBranch then_id)
1017 code (labelC else_id)
1018 emitCond (e1 `BoolOr` e2) then_id = do
1021 emitCond (e1 `BoolAnd` e2) then_id = do
1022 -- we'd like to invert one of the conditionals here to avoid an
1023 -- extra branch instruction, but we can't use maybeInvertComparison
1024 -- here because we can't look too closely at the expression since
1026 and_id <- code newLabelC
1027 else_id <- code newLabelC
1029 stmtEC (CmmBranch else_id)
1030 code (labelC and_id)
1032 code (labelC else_id)
1035 -- -----------------------------------------------------------------------------
1038 -- We use a simplified form of C-- switch statements for now. A
1039 -- switch statement always compiles to a table jump. Each arm can
1040 -- specify a list of values (not ranges), and there can be a single
1041 -- default branch. The range of the table is given either by the
1042 -- optional range on the switch (eg. switch [0..7] {...}), or by
1043 -- the minimum/maximum values from the branches.
1045 doSwitch :: Maybe (Int,Int) -> ExtFCode CmmExpr -> [([Int],ExtCode)]
1046 -> Maybe ExtCode -> ExtCode
1047 doSwitch mb_range scrut arms deflt
1049 -- Compile code for the default branch
1052 Nothing -> return Nothing
1053 Just e -> do b <- forkLabelledCodeEC e; return (Just b)
1055 -- Compile each case branch
1056 table_entries <- mapM emitArm arms
1058 -- Construct the table
1060 all_entries = concat table_entries
1061 ixs = map fst all_entries
1063 | Just (l,u) <- mb_range = (l,u)
1064 | otherwise = (minimum ixs, maximum ixs)
1066 entries = elems (accumArray (\_ a -> Just a) dflt_entry (min,max)
1069 -- ToDo: check for out of range and jump to default if necessary
1070 stmtEC (CmmSwitch expr entries)
1072 emitArm :: ([Int],ExtCode) -> ExtFCode [(Int,BlockId)]
1073 emitArm (ints,code) = do
1074 blockid <- forkLabelledCodeEC code
1075 return [ (i,blockid) | i <- ints ]
1078 -- -----------------------------------------------------------------------------
1079 -- Putting it all together
1081 -- The initial environment: we define some constants that the compiler
1082 -- knows about here.
1084 initEnv = listToUFM [
1085 ( fsLit "SIZEOF_StgHeader",
1086 Var (CmmLit (CmmInt (fromIntegral (fixedHdrSize * wORD_SIZE)) wordRep) )),
1087 ( fsLit "SIZEOF_StgInfoTable",
1088 Var (CmmLit (CmmInt (fromIntegral stdInfoTableSizeB) wordRep) ))
1091 parseCmmFile :: DynFlags -> FilePath -> IO (Maybe Cmm)
1092 parseCmmFile dflags filename = do
1093 showPass dflags "ParseCmm"
1094 buf <- hGetStringBuffer filename
1096 init_loc = mkSrcLoc (mkFastString filename) 1 0
1097 init_state = (mkPState buf init_loc dflags) { lex_state = [0] }
1098 -- reset the lex_state: the Lexer monad leaves some stuff
1099 -- in there we don't want.
1100 case unP cmmParse init_state of
1101 PFailed span err -> do printError span err; return Nothing
1103 cmm <- initC dflags no_module (getCmm (unEC code initEnv [] >> return ()))
1104 let ms = getMessages pst
1105 printErrorsAndWarnings dflags ms
1106 when (errorsFound dflags ms) $ exitWith (ExitFailure 1)
1107 dumpIfSet_dyn dflags Opt_D_dump_cmm "Cmm" (ppr cmm)
1110 no_module = panic "parseCmmFile: no module"