1 -- ----------------------------------------------------------------------------
2 -- | Handle conversion of CmmProc to LLVM code.
5 module LlvmCodeGen.CodeGen ( genLlvmProc ) where
7 #include "HsVersions.h"
10 import LlvmCodeGen.Base
11 import LlvmCodeGen.Regs
14 import CgUtils ( activeStgRegs )
17 import qualified PprCmm
23 import Outputable hiding ( panic, pprPanic )
24 import qualified Outputable
29 import Control.Monad ( liftM )
31 type LlvmStatements = OrdList LlvmStatement
33 -- -----------------------------------------------------------------------------
34 -- | Top-level of the llvm proc codegen
36 genLlvmProc :: LlvmEnv -> RawCmmTop -> UniqSM (LlvmEnv, [LlvmCmmTop])
37 genLlvmProc env (CmmData _ _)
40 genLlvmProc env (CmmProc _ _ _ (ListGraph []))
43 genLlvmProc env (CmmProc info lbl params (ListGraph blocks))
45 (env', lmblocks, lmdata) <- basicBlocksCodeGen env blocks ([], [])
47 let proc = CmmProc info lbl params (ListGraph lmblocks)
48 let tops = lmdata ++ [proc]
53 -- -----------------------------------------------------------------------------
54 -- * Block code generation
57 -- | Generate code for a list of blocks that make up a complete procedure.
58 basicBlocksCodeGen :: LlvmEnv
60 -> ( [LlvmBasicBlock] , [LlvmCmmTop] )
61 -> UniqSM (LlvmEnv, [LlvmBasicBlock] , [LlvmCmmTop] )
62 basicBlocksCodeGen env ([]) (blocks, tops)
63 = do let (blocks', allocs) = mapAndUnzip dominateAllocs blocks
64 let allocs' = concat allocs
65 let ((BasicBlock id fstmts):rblocks) = blocks'
67 let fblocks = (BasicBlock id (fplog ++ allocs' ++ fstmts)):rblocks
68 return (env, fblocks, tops)
70 basicBlocksCodeGen env (block:blocks) (lblocks', ltops')
71 = do (env', lb, lt) <- basicBlockCodeGen env block
72 let lblocks = lblocks' ++ lb
73 let ltops = ltops' ++ lt
74 basicBlocksCodeGen env' blocks (lblocks, ltops)
77 -- | Generate code for one block
78 basicBlockCodeGen :: LlvmEnv
80 -> UniqSM ( LlvmEnv, [LlvmBasicBlock], [LlvmCmmTop] )
81 basicBlockCodeGen env (BasicBlock id stmts)
82 = do (env', instrs, top) <- stmtsToInstrs env stmts (nilOL, [])
83 return (env', [BasicBlock id (fromOL instrs)], top)
86 -- | Allocations need to be extracted so they can be moved to the entry
87 -- of a function to make sure they dominate all posible paths in the CFG.
88 dominateAllocs :: LlvmBasicBlock -> (LlvmBasicBlock, [LlvmStatement])
89 dominateAllocs (BasicBlock id stmts)
90 = (BasicBlock id allstmts, allallocs)
92 (allstmts, allallocs) = foldl split ([],[]) stmts
93 split (stmts', allocs) s@(Assignment _ (Alloca _ _))
94 = (stmts', allocs ++ [s])
95 split (stmts', allocs) other
96 = (stmts' ++ [other], allocs)
99 -- -----------------------------------------------------------------------------
100 -- * CmmStmt code generation
103 -- A statement conversion return data.
104 -- * LlvmEnv: The new enviornment
105 -- * LlvmStatements: The compiled llvm statements.
106 -- * LlvmCmmTop: Any global data needed.
107 type StmtData = (LlvmEnv, LlvmStatements, [LlvmCmmTop])
110 -- | Convert a list of CmmStmt's to LlvmStatement's
111 stmtsToInstrs :: LlvmEnv -> [CmmStmt] -> (LlvmStatements, [LlvmCmmTop])
113 stmtsToInstrs env [] (llvm, top)
114 = return (env, llvm, top)
116 stmtsToInstrs env (stmt : stmts) (llvm, top)
117 = do (env', instrs, tops) <- stmtToInstrs env stmt
118 stmtsToInstrs env' stmts (llvm `appOL` instrs, top ++ tops)
121 -- | Convert a CmmStmt to a list of LlvmStatement's
122 stmtToInstrs :: LlvmEnv -> CmmStmt
124 stmtToInstrs env stmt = case stmt of
126 CmmNop -> return (env, nilOL, [])
127 CmmComment _ -> return (env, nilOL, []) -- nuke comments
129 CmmAssign reg src -> genAssign env reg src
130 CmmStore addr src -> genStore env addr src
132 CmmBranch id -> genBranch env id
133 CmmCondBranch arg id -> genCondBranch env arg id
134 CmmSwitch arg ids -> genSwitch env arg ids
137 CmmCall target res args _ ret
138 -> genCall env target res args ret
141 CmmJump arg _ -> genJump env arg
143 -- CPS, only tail calls, no return's
144 -- Actually, there are a few return statements that occur because of hand
147 -> return (env, unitOL $ Return Nothing, [])
151 genCall :: LlvmEnv -> CmmCallTarget -> HintedCmmFormals -> HintedCmmActuals
152 -> CmmReturnInfo -> UniqSM StmtData
154 -- Write barrier needs to be handled specially as it is implemented as an llvm
155 -- intrinsic function.
156 genCall env (CmmPrim MO_WriteBarrier) _ _ _ = do
157 let fname = fsLit "llvm.memory.barrier"
158 let funSig = LlvmFunctionDecl fname ExternallyVisible CC_Ccc LMVoid
159 FixedArgs (tysToParams [i1, i1, i1, i1, i1]) llvmFunAlign
160 let fty = LMFunction funSig
162 let fv = LMGlobalVar fname fty (funcLinkage funSig) Nothing Nothing False
163 let tops = case funLookup fname env of
165 Nothing -> [CmmData Data [([],[fty])]]
167 let args = [lmTrue, lmTrue, lmTrue, lmTrue, lmTrue]
168 let s1 = Expr $ Call StdCall fv args llvmStdFunAttrs
169 let env' = funInsert fname fty env
171 return (env', unitOL s1, tops)
175 lmTrue = LMLitVar $ LMIntLit (-1) i1
177 -- Handle all other foreign calls and prim ops.
178 genCall env target res args ret = do
181 let arg_type (CmmHinted _ AddrHint) = i8Ptr
182 -- cast pointers to i8*. Llvm equivalent of void*
183 arg_type (CmmHinted expr _ ) = cmmToLlvmType $ cmmExprType expr
186 let ret_type ([]) = LMVoid
187 ret_type ([CmmHinted _ AddrHint]) = i8Ptr
188 ret_type ([CmmHinted reg _]) = cmmToLlvmType $ localRegType reg
189 ret_type t = panic $ "genCall: Too many return values! Can only handle"
190 ++ " 0 or 1, given " ++ show (length t) ++ "."
192 -- extract cmm call convention
193 let cconv = case target of
194 CmmCallee _ conv -> conv
195 CmmPrim _ -> PrimCallConv
197 -- translate to llvm call convention
198 let lmconv = case cconv of
199 #if i386_TARGET_ARCH || x86_64_TARGET_ARCH
200 StdCallConv -> CC_X86_Stdcc
202 StdCallConv -> CC_Ccc
205 PrimCallConv -> CC_Ccc
206 CmmCallConv -> panic "CmmCallConv not supported here!"
209 Some of the possibilities here are a worry with the use of a custom
210 calling convention for passing STG args. In practice the more
211 dangerous combinations (e.g StdCall + llvmGhcCC) don't occur.
213 The native code generator only handles StdCall and CCallConv.
217 let fnAttrs | ret == CmmNeverReturns = NoReturn : llvmStdFunAttrs
218 | otherwise = llvmStdFunAttrs
221 let ccTy = StdCall -- tail calls should be done through CmmJump
222 let retTy = ret_type res
223 let argTy = tysToParams $ map arg_type args
224 let funTy name = LMFunction $ LlvmFunctionDecl name ExternallyVisible
225 lmconv retTy FixedArgs argTy llvmFunAlign
227 -- get paramter values
228 (env1, argVars, stmts1, top1) <- arg_vars env args ([], nilOL, [])
230 -- get the return register
231 let ret_reg ([CmmHinted reg hint]) = (reg, hint)
232 ret_reg t = panic $ "genCall: Bad number of registers! Can only handle"
233 ++ " 1, given " ++ show (length t) ++ "."
235 -- deal with call types
236 let getFunPtr :: CmmCallTarget -> UniqSM ExprData
237 getFunPtr targ = case targ of
238 CmmCallee (CmmLit (CmmLabel lbl)) _ -> do
239 let name = strCLabel_llvm lbl
240 case funLookup name env1 of
241 Just ty'@(LMFunction sig) -> do
242 -- Function in module in right form
243 let fun = LMGlobalVar name ty' (funcLinkage sig)
244 Nothing Nothing False
245 return (env1, fun, nilOL, [])
248 -- label in module but not function pointer, convert
249 let fty@(LMFunction sig) = funTy name
250 let fun = LMGlobalVar name (pLift ty') (funcLinkage sig)
251 Nothing Nothing False
252 (v1, s1) <- doExpr (pLift fty)
253 $ Cast LM_Bitcast fun (pLift fty)
254 return (env1, v1, unitOL s1, [])
257 -- label not in module, create external reference
258 let fty@(LMFunction sig) = funTy name
259 let fun = LMGlobalVar name fty (funcLinkage sig)
260 Nothing Nothing False
261 let top = CmmData Data [([],[fty])]
262 let env' = funInsert name fty env1
263 return (env', fun, nilOL, [top])
265 CmmCallee expr _ -> do
266 (env', v1, stmts, top) <- exprToVar env1 expr
267 let fty = funTy $ fsLit "dynamic"
268 let cast = case getVarType v1 of
269 ty | isPointer ty -> LM_Bitcast
270 ty | isInt ty -> LM_Inttoptr
272 ty -> panic $ "genCall: Expr is of bad type for function"
273 ++ " call! (" ++ show (ty) ++ ")"
275 (v2,s1) <- doExpr (pLift fty) $ Cast cast v1 (pLift fty)
276 return (env', v2, stmts `snocOL` s1, top)
279 let name = cmmPrimOpFunctions mop
280 let lbl = mkForeignLabel name Nothing
281 ForeignLabelInExternalPackage IsFunction
282 getFunPtr $ CmmCallee (CmmLit (CmmLabel lbl)) CCallConv
284 (env2, fptr, stmts2, top2) <- getFunPtr target
286 let retStmt | ccTy == TailCall = unitOL $ Return Nothing
287 | ret == CmmNeverReturns = unitOL $ Unreachable
290 -- make the actual call
293 let s1 = Expr $ Call ccTy fptr argVars fnAttrs
294 let allStmts = stmts1 `appOL` stmts2 `snocOL` s1 `appOL` retStmt
295 return (env2, allStmts, top1 ++ top2)
298 let (creg, _) = ret_reg res
299 let (env3, vreg, stmts3, top3) = getCmmReg env2 (CmmLocal creg)
300 let allStmts = stmts1 `appOL` stmts2 `appOL` stmts3
301 (v1, s1) <- doExpr retTy $ Call ccTy fptr argVars fnAttrs
302 if retTy == pLower (getVarType vreg)
304 let s2 = Store v1 vreg
305 return (env3, allStmts `snocOL` s1 `snocOL` s2
306 `appOL` retStmt, top1 ++ top2 ++ top3)
308 let ty = pLower $ getVarType vreg
310 vt | isPointer vt -> LM_Bitcast
311 | isInt vt -> LM_Ptrtoint
313 panic $ "genCall: CmmReg bad match for"
316 (v2, s2) <- doExpr ty $ Cast op v1 ty
317 let s3 = Store v2 vreg
318 return (env3, allStmts `snocOL` s1 `snocOL` s2 `snocOL` s3
319 `appOL` retStmt, top1 ++ top2 ++ top3)
322 -- | Conversion of call arguments.
325 -> ([LlvmVar], LlvmStatements, [LlvmCmmTop])
326 -> UniqSM (LlvmEnv, [LlvmVar], LlvmStatements, [LlvmCmmTop])
328 arg_vars env [] (vars, stmts, tops)
329 = return (env, vars, stmts, tops)
331 arg_vars env (CmmHinted e AddrHint:rest) (vars, stmts, tops)
332 = do (env', v1, stmts', top') <- exprToVar env e
333 let op = case getVarType v1 of
334 ty | isPointer ty -> LM_Bitcast
335 ty | isInt ty -> LM_Inttoptr
337 a -> panic $ "genCall: Can't cast llvmType to i8*! ("
340 (v2, s1) <- doExpr i8Ptr $ Cast op v1 i8Ptr
341 arg_vars env' rest (vars ++ [v2], stmts `appOL` stmts' `snocOL` s1,
344 arg_vars env (CmmHinted e _:rest) (vars, stmts, tops)
345 = do (env', v1, stmts', top') <- exprToVar env e
346 arg_vars env' rest (vars ++ [v1], stmts `appOL` stmts', tops ++ top')
348 -- | Decide what C function to use to implement a CallishMachOp
349 cmmPrimOpFunctions :: CallishMachOp -> FastString
350 cmmPrimOpFunctions mop
352 MO_F32_Exp -> fsLit "expf"
353 MO_F32_Log -> fsLit "logf"
354 MO_F32_Sqrt -> fsLit "llvm.sqrt.f32"
355 MO_F32_Pwr -> fsLit "llvm.pow.f32"
357 MO_F32_Sin -> fsLit "llvm.sin.f32"
358 MO_F32_Cos -> fsLit "llvm.cos.f32"
359 MO_F32_Tan -> fsLit "tanf"
361 MO_F32_Asin -> fsLit "asinf"
362 MO_F32_Acos -> fsLit "acosf"
363 MO_F32_Atan -> fsLit "atanf"
365 MO_F32_Sinh -> fsLit "sinhf"
366 MO_F32_Cosh -> fsLit "coshf"
367 MO_F32_Tanh -> fsLit "tanhf"
369 MO_F64_Exp -> fsLit "exp"
370 MO_F64_Log -> fsLit "log"
371 MO_F64_Sqrt -> fsLit "llvm.sqrt.f64"
372 MO_F64_Pwr -> fsLit "llvm.pow.f64"
374 MO_F64_Sin -> fsLit "llvm.sin.f64"
375 MO_F64_Cos -> fsLit "llvm.cos.f64"
376 MO_F64_Tan -> fsLit "tan"
378 MO_F64_Asin -> fsLit "asin"
379 MO_F64_Acos -> fsLit "acos"
380 MO_F64_Atan -> fsLit "atan"
382 MO_F64_Sinh -> fsLit "sinh"
383 MO_F64_Cosh -> fsLit "cosh"
384 MO_F64_Tanh -> fsLit "tanh"
386 a -> panic $ "cmmPrimOpFunctions: Unknown callish op! (" ++ show a ++ ")"
389 -- | Tail function calls
390 genJump :: LlvmEnv -> CmmExpr -> UniqSM StmtData
392 -- Call to known function
393 genJump env (CmmLit (CmmLabel lbl)) = do
394 (env', vf, stmts, top) <- getHsFunc env lbl
395 (stgRegs, stgStmts) <- funEpilogue
396 let s1 = Expr $ Call TailCall vf stgRegs llvmStdFunAttrs
397 let s2 = Return Nothing
398 return (env', stmts `appOL` stgStmts `snocOL` s1 `snocOL` s2, top)
401 -- Call to unknown function / address
402 genJump env expr = do
404 (env', vf, stmts, top) <- exprToVar env expr
406 let cast = case getVarType vf of
407 ty | isPointer ty -> LM_Bitcast
408 ty | isInt ty -> LM_Inttoptr
410 ty -> panic $ "genJump: Expr is of bad type for function call! ("
413 (v1, s1) <- doExpr (pLift fty) $ Cast cast vf (pLift fty)
414 (stgRegs, stgStmts) <- funEpilogue
415 let s2 = Expr $ Call TailCall v1 stgRegs llvmStdFunAttrs
416 let s3 = Return Nothing
417 return (env', stmts `snocOL` s1 `appOL` stgStmts `snocOL` s2 `snocOL` s3,
421 -- | CmmAssign operation
423 -- We use stack allocated variables for CmmReg. The optimiser will replace
424 -- these with registers when possible.
425 genAssign :: LlvmEnv -> CmmReg -> CmmExpr -> UniqSM StmtData
426 genAssign env reg val = do
427 let (env1, vreg, stmts1, top1) = getCmmReg env reg
428 (env2, vval, stmts2, top2) <- exprToVar env1 val
429 let stmts = stmts1 `appOL` stmts2
431 let ty = (pLower . getVarType) vreg
432 case isPointer ty && getVarType vval == llvmWord of
433 -- Some registers are pointer types, so need to cast value to pointer
435 (v, s1) <- doExpr ty $ Cast LM_Inttoptr vval ty
436 let s2 = Store v vreg
437 return (env2, stmts `snocOL` s1 `snocOL` s2, top1 ++ top2)
440 let s1 = Store vval vreg
441 return (env2, stmts `snocOL` s1, top1 ++ top2)
444 -- | CmmStore operation
445 genStore :: LlvmEnv -> CmmExpr -> CmmExpr -> UniqSM StmtData
447 -- First we try to detect a few common cases and produce better code for
448 -- these then the default case. We are mostly trying to detect Cmm code
449 -- like I32[Sp + n] and use 'getelementptr' operations instead of the
450 -- generic case that uses casts and pointer arithmetic
451 genStore env addr@(CmmReg (CmmGlobal r)) val
452 = genStore_fast env addr r 0 val
454 genStore env addr@(CmmRegOff (CmmGlobal r) n) val
455 = genStore_fast env addr r n val
457 genStore env addr@(CmmMachOp (MO_Add _) [
458 (CmmReg (CmmGlobal r)),
459 (CmmLit (CmmInt n _))])
461 = genStore_fast env addr r (fromInteger n) val
463 genStore env addr@(CmmMachOp (MO_Sub _) [
464 (CmmReg (CmmGlobal r)),
465 (CmmLit (CmmInt n _))])
467 = genStore_fast env addr r (negate $ fromInteger n) val
470 genStore env addr val = genStore_slow env addr val
472 -- | CmmStore operation
473 -- This is a special case for storing to a global register pointer
474 -- offset such as I32[Sp+8].
475 genStore_fast :: LlvmEnv -> CmmExpr -> GlobalReg -> Int -> CmmExpr
477 genStore_fast env addr r n val
478 = let gr = lmGlobalRegVar r
479 grt = (pLower . getVarType) gr
480 ix = n `div` ((llvmWidthInBits . pLower) grt `div` 8)
481 in case isPointer grt of
483 (env', vval, stmts, top) <- exprToVar env val
484 (gv, s1) <- doExpr grt $ Load gr
485 (ptr, s2) <- doExpr grt $ GetElemPtr gv [ix]
486 -- We might need a different pointer type, so check
487 case pLower grt == getVarType vval of
490 let s3 = Store vval ptr
491 return (env', stmts `snocOL` s1 `snocOL` s2
494 -- cast to pointer type needed
496 let ty = (pLift . getVarType) vval
497 (ptr', s3) <- doExpr ty $ Cast LM_Bitcast ptr ty
498 let s4 = Store vval ptr'
499 return (env', stmts `snocOL` s1 `snocOL` s2
500 `snocOL` s3 `snocOL` s4, top)
502 -- If its a bit type then we use the slow method since
503 -- we can't avoid casting anyway.
504 False -> genStore_slow env addr val
507 -- | CmmStore operation
508 -- Generic case. Uses casts and pointer arithmetic if needed.
509 genStore_slow :: LlvmEnv -> CmmExpr -> CmmExpr -> UniqSM StmtData
510 genStore_slow env addr val = do
511 (env1, vaddr, stmts1, top1) <- exprToVar env addr
512 (env2, vval, stmts2, top2) <- exprToVar env1 val
514 let stmts = stmts1 `appOL` stmts2
515 case getVarType vaddr of
516 -- sometimes we need to cast an int to a pointer before storing
517 LMPointer ty@(LMPointer _) | getVarType vval == llvmWord -> do
518 (v, s1) <- doExpr ty $ Cast LM_Inttoptr vval ty
519 let s2 = Store v vaddr
520 return (env2, stmts `snocOL` s1 `snocOL` s2, top1 ++ top2)
523 let s1 = Store vval vaddr
524 return (env2, stmts `snocOL` s1, top1 ++ top2)
526 i@(LMInt _) | i == llvmWord -> do
527 let vty = pLift $ getVarType vval
528 (vptr, s1) <- doExpr vty $ Cast LM_Inttoptr vaddr vty
529 let s2 = Store vval vptr
530 return (env2, stmts `snocOL` s1 `snocOL` s2, top1 ++ top2)
533 pprPanic "genStore: ptr not right type!"
534 (PprCmm.pprExpr addr <+> text (
535 "Size of Ptr: " ++ show llvmPtrBits ++
536 ", Size of var: " ++ show (llvmWidthInBits other) ++
537 ", Var: " ++ show vaddr))
540 -- | Unconditional branch
541 genBranch :: LlvmEnv -> BlockId -> UniqSM StmtData
543 let label = blockIdToLlvm id
544 in return (env, unitOL $ Branch label, [])
547 -- | Conditional branch
548 genCondBranch :: LlvmEnv -> CmmExpr -> BlockId -> UniqSM StmtData
549 genCondBranch env cond idT = do
551 let labelT = blockIdToLlvm idT
552 let labelF = LMLocalVar idF LMLabel
553 (env', vc, stmts, top) <- exprToVarOpt env i1Option cond
554 if getVarType vc == i1
556 let s1 = BranchIf vc labelT labelF
558 return $ (env', stmts `snocOL` s1 `snocOL` s2, top)
560 panic $ "genCondBranch: Cond expr not bool! (" ++ show vc ++ ")"
565 -- N.B. we remove Nothing's from the list of branches, as they are 'undefined'.
566 -- However, they may be defined one day, so we better document this behaviour.
567 genSwitch :: LlvmEnv -> CmmExpr -> [Maybe BlockId] -> UniqSM StmtData
568 genSwitch env cond maybe_ids = do
569 (env', vc, stmts, top) <- exprToVar env cond
570 let ty = getVarType vc
572 let pairs = [ (ix, id) | (ix,Just id) <- zip ([0..]::[Integer]) maybe_ids ]
573 let labels = map (\(ix, b) -> (mkIntLit ix ty, blockIdToLlvm b)) pairs
574 -- out of range is undefied, so lets just branch to first label
575 let (_, defLbl) = head labels
577 let s1 = Switch vc defLbl labels
578 return $ (env', stmts `snocOL` s1, top)
581 -- -----------------------------------------------------------------------------
582 -- * CmmExpr code generation
585 -- | An expression conversion return data:
586 -- * LlvmEnv: The new enviornment
587 -- * LlvmVar: The var holding the result of the expression
588 -- * LlvmStatements: Any statements needed to evaluate the expression
589 -- * LlvmCmmTop: Any global data needed for this expression
590 type ExprData = (LlvmEnv, LlvmVar, LlvmStatements, [LlvmCmmTop])
592 -- | Values which can be passed to 'exprToVar' to configure its
593 -- behaviour in certain circumstances.
594 data EOption = EOption {
595 -- | The expected LlvmType for the returned variable.
597 -- Currently just used for determining if a comparison should return
598 -- a boolean (i1) or a int (i32/i64).
599 eoExpectedType :: Maybe LlvmType
603 i1Option = EOption (Just i1)
605 wordOption :: EOption
606 wordOption = EOption (Just llvmWord)
609 -- | Convert a CmmExpr to a list of LlvmStatements with the result of the
610 -- expression being stored in the returned LlvmVar.
611 exprToVar :: LlvmEnv -> CmmExpr -> UniqSM ExprData
612 exprToVar env = exprToVarOpt env wordOption
614 exprToVarOpt :: LlvmEnv -> EOption -> CmmExpr -> UniqSM ExprData
615 exprToVarOpt env opt e = case e of
621 -> genCmmLoad env e' ty
623 -- Cmmreg in expression is the value, so must load. If you want actual
624 -- reg pointer, call getCmmReg directly.
626 let (env', vreg, stmts, top) = getCmmReg env r
627 (v1, s1) <- doExpr (pLower $ getVarType vreg) $ Load vreg
628 case (isPointer . getVarType) v1 of
630 -- Cmm wants the value, so pointer types must be cast to ints
631 -- TODO: Remove, keep as pointers as much as possible
632 (v2, s2) <- doExpr llvmWord $ Cast LM_Ptrtoint v1 llvmWord
633 return (env', v2, stmts `snocOL` s1 `snocOL` s2, top)
635 False -> return (env', v1, stmts `snocOL` s1, top)
638 -> genMachOp env opt op exprs
641 -> exprToVar env $ expandCmmReg (r, i)
644 -> panic "exprToVar: CmmStackSlot not supported!"
647 -- | Handle CmmMachOp expressions
648 genMachOp :: LlvmEnv -> EOption -> MachOp -> [CmmExpr] -> UniqSM ExprData
651 genMachOp env _ op [x] = case op of
654 let all1 = mkIntLit (-1::Int) (widthToLlvmInt w)
655 in negate (widthToLlvmInt w) all1 LM_MO_Xor
658 let all0 = mkIntLit (0::Int) (widthToLlvmInt w)
659 in negate (widthToLlvmInt w) all0 LM_MO_Sub
662 let all0 = LMLitVar $ LMFloatLit (-0) (widthToLlvmFloat w)
663 in negate (widthToLlvmFloat w) all0 LM_MO_FSub
665 MO_SF_Conv _ w -> fiConv (widthToLlvmFloat w) LM_Sitofp
666 MO_FS_Conv _ w -> fiConv (widthToLlvmInt w) LM_Fptosi
669 -> sameConv from (widthToLlvmInt to) LM_Trunc LM_Sext
672 -> sameConv from (widthToLlvmInt to) LM_Trunc LM_Zext
675 -> sameConv from (widthToLlvmFloat to) LM_Fptrunc LM_Fpext
677 a -> panic $ "genMachOp: unmatched unary CmmMachOp! (" ++ show a ++ ")"
680 negate ty v2 negOp = do
681 (env', vx, stmts, top) <- exprToVar env x
682 (v1, s1) <- doExpr ty $ LlvmOp negOp v2 vx
683 return (env', v1, stmts `snocOL` s1, top)
685 fiConv ty convOp = do
686 (env', vx, stmts, top) <- exprToVar env x
687 (v1, s1) <- doExpr ty $ Cast convOp vx ty
688 return (env', v1, stmts `snocOL` s1, top)
690 sameConv from ty reduce expand = do
691 x'@(env', vx, stmts, top) <- exprToVar env x
692 let sameConv' op = do
693 (v1, s1) <- doExpr ty $ Cast op vx ty
694 return (env', v1, stmts `snocOL` s1, top)
695 let toWidth = llvmWidthInBits ty
696 -- LLVM doesn't like trying to convert to same width, so
697 -- need to check for that as we do get cmm code doing it.
698 case widthInBits from of
699 w | w < toWidth -> sameConv' expand
700 w | w > toWidth -> sameConv' reduce
705 genMachOp env opt op [x, y] = case op of
707 MO_Eq _ -> genBinComp opt LM_CMP_Eq
708 MO_Ne _ -> genBinComp opt LM_CMP_Ne
710 MO_S_Gt _ -> genBinComp opt LM_CMP_Sgt
711 MO_S_Ge _ -> genBinComp opt LM_CMP_Sge
712 MO_S_Lt _ -> genBinComp opt LM_CMP_Slt
713 MO_S_Le _ -> genBinComp opt LM_CMP_Sle
715 MO_U_Gt _ -> genBinComp opt LM_CMP_Ugt
716 MO_U_Ge _ -> genBinComp opt LM_CMP_Uge
717 MO_U_Lt _ -> genBinComp opt LM_CMP_Ult
718 MO_U_Le _ -> genBinComp opt LM_CMP_Ule
720 MO_Add _ -> genBinMach LM_MO_Add
721 MO_Sub _ -> genBinMach LM_MO_Sub
722 MO_Mul _ -> genBinMach LM_MO_Mul
724 MO_U_MulMayOflo _ -> panic "genMachOp: MO_U_MulMayOflo unsupported!"
726 MO_S_MulMayOflo w -> isSMulOK w x y
728 MO_S_Quot _ -> genBinMach LM_MO_SDiv
729 MO_S_Rem _ -> genBinMach LM_MO_SRem
731 MO_U_Quot _ -> genBinMach LM_MO_UDiv
732 MO_U_Rem _ -> genBinMach LM_MO_URem
734 MO_F_Eq _ -> genBinComp opt LM_CMP_Feq
735 MO_F_Ne _ -> genBinComp opt LM_CMP_Fne
736 MO_F_Gt _ -> genBinComp opt LM_CMP_Fgt
737 MO_F_Ge _ -> genBinComp opt LM_CMP_Fge
738 MO_F_Lt _ -> genBinComp opt LM_CMP_Flt
739 MO_F_Le _ -> genBinComp opt LM_CMP_Fle
741 MO_F_Add _ -> genBinMach LM_MO_FAdd
742 MO_F_Sub _ -> genBinMach LM_MO_FSub
743 MO_F_Mul _ -> genBinMach LM_MO_FMul
744 MO_F_Quot _ -> genBinMach LM_MO_FDiv
746 MO_And _ -> genBinMach LM_MO_And
747 MO_Or _ -> genBinMach LM_MO_Or
748 MO_Xor _ -> genBinMach LM_MO_Xor
749 MO_Shl _ -> genBinMach LM_MO_Shl
750 MO_U_Shr _ -> genBinMach LM_MO_LShr
751 MO_S_Shr _ -> genBinMach LM_MO_AShr
753 a -> panic $ "genMachOp: unmatched binary CmmMachOp! (" ++ show a ++ ")"
756 binLlvmOp ty binOp = do
757 (env1, vx, stmts1, top1) <- exprToVar env x
758 (env2, vy, stmts2, top2) <- exprToVar env1 y
759 if getVarType vx == getVarType vy
761 (v1, s1) <- doExpr (ty vx) $ binOp vx vy
762 return (env2, v1, stmts1 `appOL` stmts2 `snocOL` s1,
766 -- XXX: Error. Continue anyway so we can debug the generated
768 let cmmToStr = (lines . show . llvmSDoc . PprCmm.pprExpr)
769 let dx = Comment $ map fsLit $ cmmToStr x
770 let dy = Comment $ map fsLit $ cmmToStr y
771 (v1, s1) <- doExpr (ty vx) $ binOp vx vy
772 let allStmts = stmts1 `appOL` stmts2 `snocOL` dx
773 `snocOL` dy `snocOL` s1
774 return (env2, v1, allStmts, top1 ++ top2)
776 -- let o = case binOp vx vy of
777 -- Compare op _ _ -> show op
778 -- LlvmOp op _ _ -> show op
780 -- panic $ "genMachOp: comparison between different types ("
781 -- ++ o ++ " "++ show vx ++ ", " ++ show vy ++ ")"
782 -- ++ "\ne1: " ++ (show.llvmSDoc.PprCmm.pprExpr $ x)
783 -- ++ "\ne2: " ++ (show.llvmSDoc.PprCmm.pprExpr $ y)
785 -- | Need to use EOption here as Cmm expects word size results from
786 -- comparisons while llvm return i1. Need to extend to llvmWord type
788 genBinComp opt cmp = do
789 ed@(env', v1, stmts, top) <- binLlvmOp (\_ -> i1) $ Compare cmp
791 if getVarType v1 == i1
793 case eoExpectedType opt of
801 (v2, s1) <- doExpr t $ Cast LM_Zext v1 t
802 return (env', v2, stmts `snocOL` s1, top)
805 panic $ "genBinComp: Can't case i1 compare"
806 ++ "res to non int type " ++ show (t)
808 panic $ "genBinComp: Compare returned type other then i1! "
809 ++ (show $ getVarType v1)
811 genBinMach op = binLlvmOp getVarType (LlvmOp op)
813 -- | Detect if overflow will occur in signed multiply of the two
814 -- CmmExpr's. This is the LLVM assembly equivalent of the NCG
815 -- implementation. Its much longer due to type information/safety.
816 -- This should actually compile to only about 3 asm instructions.
817 isSMulOK :: Width -> CmmExpr -> CmmExpr -> UniqSM ExprData
819 (env1, vx, stmts1, top1) <- exprToVar env x
820 (env2, vy, stmts2, top2) <- exprToVar env1 y
822 let word = getVarType vx
823 let word2 = LMInt $ 2 * (llvmWidthInBits $ getVarType vx)
824 let shift = llvmWidthInBits word
825 let shift1 = mkIntLit (shift - 1) llvmWord
826 let shift2 = mkIntLit shift llvmWord
830 (x1, s1) <- doExpr word2 $ Cast LM_Sext vx word2
831 (y1, s2) <- doExpr word2 $ Cast LM_Sext vy word2
832 (r1, s3) <- doExpr word2 $ LlvmOp LM_MO_Mul x1 y1
833 (rlow1, s4) <- doExpr word $ Cast LM_Trunc r1 word
834 (rlow2, s5) <- doExpr word $ LlvmOp LM_MO_AShr rlow1 shift1
835 (rhigh1, s6) <- doExpr word2 $ LlvmOp LM_MO_AShr r1 shift2
836 (rhigh2, s7) <- doExpr word $ Cast LM_Trunc rhigh1 word
837 (dst, s8) <- doExpr word $ LlvmOp LM_MO_Sub rlow2 rhigh2
838 let stmts = (unitOL s1) `snocOL` s2 `snocOL` s3 `snocOL` s4
839 `snocOL` s5 `snocOL` s6 `snocOL` s7 `snocOL` s8
840 return (env2, dst, stmts1 `appOL` stmts2 `appOL` stmts,
844 panic $ "isSMulOK: Not bit type! (" ++ show word ++ ")"
847 -- More then two expression, invalid!
848 genMachOp _ _ _ _ = panic "genMachOp: More then 2 expressions in MachOp!"
851 -- | Handle CmmLoad expression.
852 genCmmLoad :: LlvmEnv -> CmmExpr -> CmmType -> UniqSM ExprData
854 -- First we try to detect a few common cases and produce better code for
855 -- these then the default case. We are mostly trying to detect Cmm code
856 -- like I32[Sp + n] and use 'getelementptr' operations instead of the
857 -- generic case that uses casts and pointer arithmetic
858 genCmmLoad env e@(CmmReg (CmmGlobal r)) ty
859 = genCmmLoad_fast env e r 0 ty
861 genCmmLoad env e@(CmmRegOff (CmmGlobal r) n) ty
862 = genCmmLoad_fast env e r n ty
864 genCmmLoad env e@(CmmMachOp (MO_Add _) [
865 (CmmReg (CmmGlobal r)),
866 (CmmLit (CmmInt n _))])
868 = genCmmLoad_fast env e r (fromInteger n) ty
870 genCmmLoad env e@(CmmMachOp (MO_Sub _) [
871 (CmmReg (CmmGlobal r)),
872 (CmmLit (CmmInt n _))])
874 = genCmmLoad_fast env e r (negate $ fromInteger n) ty
877 genCmmLoad env e ty = genCmmLoad_slow env e ty
879 -- | Handle CmmLoad expression.
880 -- This is a special case for loading from a global register pointer
881 -- offset such as I32[Sp+8].
882 genCmmLoad_fast :: LlvmEnv -> CmmExpr -> GlobalReg -> Int -> CmmType
884 genCmmLoad_fast env e r n ty =
885 let gr = lmGlobalRegVar r
886 grt = (pLower . getVarType) gr
887 ix = n `div` ((llvmWidthInBits . pLower) grt `div` 8)
888 ty' = cmmToLlvmType ty
889 in case isPointer grt of
891 (gv, s1) <- doExpr grt $ Load gr
892 (ptr, s2) <- doExpr grt $ GetElemPtr gv [ix]
893 -- We might need a different pointer type, so check
897 (var, s3) <- doExpr ty' $ Load ptr
898 return (env, var, unitOL s1 `snocOL` s2 `snocOL` s3,
901 -- cast to pointer type needed
904 (ptr', s3) <- doExpr pty $ Cast LM_Bitcast ptr pty
905 (var, s4) <- doExpr ty' $ Load ptr'
906 return (env, var, unitOL s1 `snocOL` s2 `snocOL` s3
909 -- If its a bit type then we use the slow method since
910 -- we can't avoid casting anyway.
911 False -> genCmmLoad_slow env e ty
914 -- | Handle Cmm load expression.
915 -- Generic case. Uses casts and pointer arithmetic if needed.
916 genCmmLoad_slow :: LlvmEnv -> CmmExpr -> CmmType -> UniqSM ExprData
917 genCmmLoad_slow env e ty = do
918 (env', iptr, stmts, tops) <- exprToVar env e
919 case getVarType iptr of
921 (dvar, load) <- doExpr (cmmToLlvmType ty) $ Load iptr
922 return (env', dvar, stmts `snocOL` load, tops)
924 i@(LMInt _) | i == llvmWord -> do
925 let pty = LMPointer $ cmmToLlvmType ty
926 (ptr, cast) <- doExpr pty $ Cast LM_Inttoptr iptr pty
927 (dvar, load) <- doExpr (cmmToLlvmType ty) $ Load ptr
928 return (env', dvar, stmts `snocOL` cast `snocOL` load, tops)
930 other -> pprPanic "exprToVar: CmmLoad expression is not right type!"
931 (PprCmm.pprExpr e <+> text (
932 "Size of Ptr: " ++ show llvmPtrBits ++
933 ", Size of var: " ++ show (llvmWidthInBits other) ++
934 ", Var: " ++ show iptr))
937 -- | Handle CmmReg expression
939 -- We allocate CmmReg on the stack. This avoids having to map a CmmReg to an
940 -- equivalent SSA form and avoids having to deal with Phi node insertion.
941 -- This is also the approach recommended by llvm developers.
942 getCmmReg :: LlvmEnv -> CmmReg -> ExprData
943 getCmmReg env r@(CmmLocal (LocalReg un _))
944 = let exists = varLookup un env
946 (newv, stmts) = allocReg r
947 nenv = varInsert un (pLower $ getVarType newv) env
949 Just ety -> (env, (LMLocalVar un $ pLift ety), nilOL, [])
950 Nothing -> (nenv, newv, stmts, [])
952 getCmmReg env (CmmGlobal g) = (env, lmGlobalRegVar g, nilOL, [])
955 -- | Allocate a CmmReg on the stack
956 allocReg :: CmmReg -> (LlvmVar, LlvmStatements)
957 allocReg (CmmLocal (LocalReg un ty))
958 = let ty' = cmmToLlvmType ty
959 var = LMLocalVar un (LMPointer ty')
961 in (var, unitOL $ Assignment var alc)
963 allocReg _ = panic $ "allocReg: Global reg encountered! Global registers should"
964 ++ " have been handled elsewhere!"
967 -- | Generate code for a literal
968 genLit :: LlvmEnv -> CmmLit -> UniqSM ExprData
969 genLit env (CmmInt i w)
970 = return (env, mkIntLit i (LMInt $ widthInBits w), nilOL, [])
972 genLit env (CmmFloat r w)
973 = return (env, LMLitVar $ LMFloatLit (fromRational r) (widthToLlvmFloat w),
976 genLit env cmm@(CmmLabel l)
977 = let label = strCLabel_llvm l
978 ty = funLookup label env
979 lmty = cmmToLlvmType $ cmmLitType cmm
981 -- Make generic external label defenition and then pointer to it
983 let glob@(var, _) = genStringLabelRef label
984 let ldata = [CmmData Data [([glob], [])]]
985 let env' = funInsert label (pLower $ getVarType var) env
986 (v1, s1) <- doExpr lmty $ Cast LM_Ptrtoint var llvmWord
987 return (env', v1, unitOL s1, ldata)
989 -- Referenced data exists in this module, retrieve type and make
992 let var = LMGlobalVar label (LMPointer ty')
993 ExternallyVisible Nothing Nothing False
994 (v1, s1) <- doExpr lmty $ Cast LM_Ptrtoint var llvmWord
995 return (env, v1, unitOL s1, [])
997 genLit env (CmmLabelOff label off) = do
998 (env', vlbl, stmts, stat) <- genLit env (CmmLabel label)
999 let voff = mkIntLit off llvmWord
1000 (v1, s1) <- doExpr (getVarType vlbl) $ LlvmOp LM_MO_Add vlbl voff
1001 return (env', v1, stmts `snocOL` s1, stat)
1003 genLit env (CmmLabelDiffOff l1 l2 off) = do
1004 (env1, vl1, stmts1, stat1) <- genLit env (CmmLabel l1)
1005 (env2, vl2, stmts2, stat2) <- genLit env1 (CmmLabel l2)
1006 let voff = mkIntLit off llvmWord
1007 let ty1 = getVarType vl1
1008 let ty2 = getVarType vl2
1009 if (isInt ty1) && (isInt ty2)
1010 && (llvmWidthInBits ty1 == llvmWidthInBits ty2)
1013 (v1, s1) <- doExpr (getVarType vl1) $ LlvmOp LM_MO_Sub vl1 vl2
1014 (v2, s2) <- doExpr (getVarType v1 ) $ LlvmOp LM_MO_Add v1 voff
1015 return (env2, v2, stmts1 `appOL` stmts2 `snocOL` s1 `snocOL` s2,
1019 panic "genLit: CmmLabelDiffOff encountered with different label ty!"
1021 genLit env (CmmBlock b)
1022 = genLit env (CmmLabel $ infoTblLbl b)
1024 genLit _ CmmHighStackMark
1025 = panic "genStaticLit - CmmHighStackMark unsupported!"
1028 -- -----------------------------------------------------------------------------
1032 -- | Function prologue. Load STG arguments into variables for function.
1033 funPrologue :: UniqSM [LlvmStatement]
1034 funPrologue = liftM concat $ mapM getReg activeStgRegs
1036 let reg = lmGlobalRegVar rr
1037 arg = lmGlobalRegArg rr
1038 alloc = Assignment reg $ Alloca (pLower $ getVarType reg) 1
1039 in return [alloc, Store arg reg]
1042 -- | Function epilogue. Load STG variables to use as argument for call.
1043 funEpilogue :: UniqSM ([LlvmVar], LlvmStatements)
1046 let reg = lmGlobalRegVar r
1047 (v,s) <- doExpr (pLower $ getVarType reg) $ Load reg
1048 return (v, unitOL s)
1049 loads <- mapM loadExpr activeStgRegs
1050 let (vars, stmts) = unzip loads
1051 return (vars, concatOL stmts)
1054 -- | Get a function pointer to the CLabel specified.
1056 -- This is for Haskell functions, function type is assumed, so doesn't work
1057 -- with foreign functions.
1058 getHsFunc :: LlvmEnv -> CLabel -> UniqSM ExprData
1060 = let fn = strCLabel_llvm lbl
1061 ty = funLookup fn env
1063 -- Function in module in right form
1064 Just ty'@(LMFunction sig) -> do
1065 let fun = LMGlobalVar fn ty' (funcLinkage sig) Nothing Nothing False
1066 return (env, fun, nilOL, [])
1068 -- label in module but not function pointer, convert
1070 let fun = LMGlobalVar fn (pLift ty') ExternallyVisible
1071 Nothing Nothing False
1072 (v1, s1) <- doExpr (pLift llvmFunTy) $
1073 Cast LM_Bitcast fun (pLift llvmFunTy)
1074 return (env, v1, unitOL s1, [])
1076 -- label not in module, create external reference
1078 let ty' = LMFunction $ llvmFunSig lbl ExternallyVisible
1079 let fun = LMGlobalVar fn ty' ExternallyVisible Nothing Nothing False
1080 let top = CmmData Data [([],[ty'])]
1081 let env' = funInsert fn ty' env
1082 return (env', fun, nilOL, [top])
1085 -- | Create a new local var
1086 mkLocalVar :: LlvmType -> UniqSM LlvmVar
1089 return $ LMLocalVar un ty
1092 -- | Execute an expression, assigning result to a var
1093 doExpr :: LlvmType -> LlvmExpression -> UniqSM (LlvmVar, LlvmStatement)
1096 return (v, Assignment v expr)
1099 -- | Expand CmmRegOff
1100 expandCmmReg :: (CmmReg, Int) -> CmmExpr
1101 expandCmmReg (reg, off)
1102 = let width = typeWidth (cmmRegType reg)
1103 voff = CmmLit $ CmmInt (fromIntegral off) width
1104 in CmmMachOp (MO_Add width) [CmmReg reg, voff]
1107 -- | Convert a block id into a appropriate Llvm label
1108 blockIdToLlvm :: BlockId -> LlvmVar
1109 blockIdToLlvm bid = LMLocalVar (getUnique bid) LMLabel
1112 -- | Create Llvm int Literal
1113 mkIntLit :: Integral a => a -> LlvmType -> LlvmVar
1114 mkIntLit i ty = LMLitVar $ LMIntLit (toInteger i) ty
1117 -- | Error functions
1118 panic :: String -> a
1119 panic s = Outputable.panic $ "LlvmCodeGen.CodeGen." ++ s
1121 pprPanic :: String -> SDoc -> a
1122 pprPanic s d = Outputable.pprPanic ("LlvmCodeGen.CodeGen." ++ s) d