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 type LlvmStatements = OrdList LlvmStatement
31 -- -----------------------------------------------------------------------------
32 -- | Top-level of the llvm proc codegen
34 genLlvmProc :: LlvmEnv -> RawCmmTop -> UniqSM (LlvmEnv, [LlvmCmmTop])
35 genLlvmProc env (CmmData _ _)
38 genLlvmProc env (CmmProc _ _ _ (ListGraph []))
41 genLlvmProc env (CmmProc info lbl params (ListGraph blocks))
43 (env', lmblocks, lmdata) <- basicBlocksCodeGen env blocks ([], [])
45 let proc = CmmProc info lbl params (ListGraph lmblocks)
46 let tops = lmdata ++ [proc]
51 -- -----------------------------------------------------------------------------
52 -- * Block code generation
55 -- | Generate code for a list of blocks that make up a complete procedure.
56 basicBlocksCodeGen :: LlvmEnv
58 -> ( [LlvmBasicBlock] , [LlvmCmmTop] )
59 -> UniqSM (LlvmEnv, [LlvmBasicBlock] , [LlvmCmmTop] )
60 basicBlocksCodeGen env ([]) (blocks, tops)
61 = do let (blocks', allocs) = mapAndUnzip dominateAllocs blocks
62 let allocs' = concat allocs
63 let ((BasicBlock id fstmts):rblocks) = blocks'
64 let fblocks = (BasicBlock id (funPrologue ++ allocs' ++ fstmts)):rblocks
65 return (env, fblocks, tops)
67 basicBlocksCodeGen env (block:blocks) (lblocks', ltops')
68 = do (env', lb, lt) <- basicBlockCodeGen env block
69 let lblocks = lblocks' ++ lb
70 let ltops = ltops' ++ lt
71 basicBlocksCodeGen env' blocks (lblocks, ltops)
74 -- | Generate code for one block
75 basicBlockCodeGen :: LlvmEnv
77 -> UniqSM ( LlvmEnv, [LlvmBasicBlock], [LlvmCmmTop] )
78 basicBlockCodeGen env (BasicBlock id stmts)
79 = do (env', instrs, top) <- stmtsToInstrs env stmts (nilOL, [])
80 return (env', [BasicBlock id (fromOL instrs)], top)
83 -- | Allocations need to be extracted so they can be moved to the entry
84 -- of a function to make sure they dominate all posible paths in the CFG.
85 dominateAllocs :: LlvmBasicBlock -> (LlvmBasicBlock, [LlvmStatement])
86 dominateAllocs (BasicBlock id stmts)
87 = (BasicBlock id allstmts, allallocs)
89 (allstmts, allallocs) = foldl split ([],[]) stmts
90 split (stmts', allocs) s@(Assignment _ (Alloca _ _))
91 = (stmts', allocs ++ [s])
92 split (stmts', allocs) other
93 = (stmts' ++ [other], allocs)
96 -- -----------------------------------------------------------------------------
97 -- * CmmStmt code generation
100 -- A statement conversion return data.
101 -- * LlvmEnv: The new enviornment
102 -- * LlvmStatements: The compiled llvm statements.
103 -- * LlvmCmmTop: Any global data needed.
104 type StmtData = (LlvmEnv, LlvmStatements, [LlvmCmmTop])
107 -- | Convert a list of CmmStmt's to LlvmStatement's
108 stmtsToInstrs :: LlvmEnv -> [CmmStmt] -> (LlvmStatements, [LlvmCmmTop])
110 stmtsToInstrs env [] (llvm, top)
111 = return (env, llvm, top)
113 stmtsToInstrs env (stmt : stmts) (llvm, top)
114 = do (env', instrs, tops) <- stmtToInstrs env stmt
115 stmtsToInstrs env' stmts (llvm `appOL` instrs, top ++ tops)
118 -- | Convert a CmmStmt to a list of LlvmStatement's
119 stmtToInstrs :: LlvmEnv -> CmmStmt
121 stmtToInstrs env stmt = case stmt of
123 CmmNop -> return (env, nilOL, [])
124 CmmComment _ -> return (env, nilOL, []) -- nuke comments
126 CmmAssign reg src -> genAssign env reg src
127 CmmStore addr src -> genStore env addr src
129 CmmBranch id -> genBranch env id
130 CmmCondBranch arg id -> genCondBranch env arg id
131 CmmSwitch arg ids -> genSwitch env arg ids
134 CmmCall target res args _ ret
135 -> genCall env target res args ret
138 CmmJump arg _ -> genJump env arg
140 -- CPS, only tail calls, no return's
141 -- Actually, there are a few return statements that occur because of hand
144 -> return (env, unitOL $ Return Nothing, [])
148 genCall :: LlvmEnv -> CmmCallTarget -> HintedCmmFormals -> HintedCmmActuals
149 -> CmmReturnInfo -> UniqSM StmtData
151 -- Write barrier needs to be handled specially as it is implemented as an llvm
152 -- intrinsic function.
153 genCall env (CmmPrim MO_WriteBarrier) _ _ _ = do
154 let fname = fsLit "llvm.memory.barrier"
155 let funSig = LlvmFunctionDecl fname ExternallyVisible CC_Ccc LMVoid
156 FixedArgs (Left [i1, i1, i1, i1, i1]) llvmFunAlign
157 let fty = LMFunction funSig
159 let fv = LMGlobalVar fname fty (funcLinkage funSig) Nothing Nothing
160 let tops = case funLookup fname env of
162 Nothing -> [CmmData Data [([],[fty])]]
164 let args = [lmTrue, lmTrue, lmTrue, lmTrue, lmTrue]
165 let s1 = Expr $ Call StdCall fv args llvmStdFunAttrs
166 let env' = funInsert fname fty env
168 return (env', unitOL s1, tops)
172 lmTrue = LMLitVar $ LMIntLit (-1) i1
174 -- Handle all other foreign calls and prim ops.
175 genCall env target res args ret = do
178 let arg_type (CmmHinted _ AddrHint) = i8Ptr
179 -- cast pointers to i8*. Llvm equivalent of void*
180 arg_type (CmmHinted expr _ ) = cmmToLlvmType $ cmmExprType expr
183 let ret_type ([]) = LMVoid
184 ret_type ([CmmHinted _ AddrHint]) = i8Ptr
185 ret_type ([CmmHinted reg _]) = cmmToLlvmType $ localRegType reg
186 ret_type t = panic $ "genCall: Too many return values! Can only handle"
187 ++ " 0 or 1, given " ++ show (length t) ++ "."
189 -- extract cmm call convention
190 let cconv = case target of
191 CmmCallee _ conv -> conv
192 CmmPrim _ -> PrimCallConv
194 -- translate to llvm call convention
195 let lmconv = case cconv of
196 #if i386_TARGET_ARCH || x86_64_TARGET_ARCH
197 StdCallConv -> CC_X86_Stdcc
199 StdCallConv -> CC_Ccc
202 PrimCallConv -> CC_Ccc
203 CmmCallConv -> panic "CmmCallConv not supported here!"
206 Some of the possibilities here are a worry with the use of a custom
207 calling convention for passing STG args. In practice the more
208 dangerous combinations (e.g StdCall + llvmGhcCC) don't occur.
210 The native code generator only handles StdCall and CCallConv.
214 let fnAttrs | ret == CmmNeverReturns = NoReturn : llvmStdFunAttrs
215 | otherwise = llvmStdFunAttrs
218 let ccTy = StdCall -- tail calls should be done through CmmJump
219 let retTy = ret_type res
220 let argTy = Left $ map arg_type args
221 let funTy name = LMFunction $ LlvmFunctionDecl name ExternallyVisible
222 lmconv retTy FixedArgs argTy llvmFunAlign
224 -- get paramter values
225 (env1, argVars, stmts1, top1) <- arg_vars env args ([], nilOL, [])
227 -- get the return register
228 let ret_reg ([CmmHinted reg hint]) = (reg, hint)
229 ret_reg t = panic $ "genCall: Bad number of registers! Can only handle"
230 ++ " 1, given " ++ show (length t) ++ "."
232 -- deal with call types
233 let getFunPtr :: CmmCallTarget -> UniqSM ExprData
234 getFunPtr targ = case targ of
235 CmmCallee (CmmLit (CmmLabel lbl)) _ -> do
236 let name = strCLabel_llvm lbl
237 case funLookup name env1 of
238 Just ty'@(LMFunction sig) -> do
239 -- Function in module in right form
240 let fun = LMGlobalVar name ty' (funcLinkage sig)
242 return (env1, fun, nilOL, [])
245 -- label in module but not function pointer, convert
246 let fty@(LMFunction sig) = funTy name
247 let fun = LMGlobalVar name fty (funcLinkage sig)
249 (v1, s1) <- doExpr (pLift fty)
250 $ Cast LM_Bitcast fun (pLift fty)
251 return (env1, v1, unitOL s1, [])
254 -- label not in module, create external reference
255 let fty@(LMFunction sig) = funTy name
256 let fun = LMGlobalVar name fty (funcLinkage sig)
258 let top = CmmData Data [([],[fty])]
259 let env' = funInsert name fty env1
260 return (env', fun, nilOL, [top])
262 CmmCallee expr _ -> do
263 (env', v1, stmts, top) <- exprToVar env1 expr
264 let fty = funTy $ fsLit "dynamic"
265 let cast = case getVarType v1 of
266 ty | isPointer ty -> LM_Bitcast
267 ty | isInt ty -> LM_Inttoptr
269 ty -> panic $ "genCall: Expr is of bad type for function"
270 ++ " call! (" ++ show (ty) ++ ")"
272 (v2,s1) <- doExpr (pLift fty) $ Cast cast v1 (pLift fty)
273 return (env', v2, stmts `snocOL` s1, top)
276 let name = cmmPrimOpFunctions mop
277 let lbl = mkForeignLabel name Nothing
278 ForeignLabelInExternalPackage IsFunction
279 getFunPtr $ CmmCallee (CmmLit (CmmLabel lbl)) CCallConv
281 (env2, fptr, stmts2, top2) <- getFunPtr target
283 let retStmt | ccTy == TailCall = unitOL $ Return Nothing
284 | ret == CmmNeverReturns = unitOL $ Unreachable
287 -- make the actual call
290 let s1 = Expr $ Call ccTy fptr argVars fnAttrs
291 let allStmts = stmts1 `appOL` stmts2 `snocOL` s1 `appOL` retStmt
292 return (env2, allStmts, top1 ++ top2)
295 let (creg, _) = ret_reg res
296 let (env3, vreg, stmts3, top3) = getCmmReg env2 (CmmLocal creg)
297 let allStmts = stmts1 `appOL` stmts2 `appOL` stmts3
298 (v1, s1) <- doExpr retTy $ Call ccTy fptr argVars fnAttrs
299 if retTy == pLower (getVarType vreg)
301 let s2 = Store v1 vreg
302 return (env3, allStmts `snocOL` s1 `snocOL` s2
303 `appOL` retStmt, top1 ++ top2 ++ top3)
305 let ty = pLower $ getVarType vreg
307 vt | isPointer vt -> LM_Bitcast
308 | isInt vt -> LM_Ptrtoint
310 panic $ "genCall: CmmReg bad match for"
313 (v2, s2) <- doExpr ty $ Cast op v1 ty
314 let s3 = Store v2 vreg
315 return (env3, allStmts `snocOL` s1 `snocOL` s2 `snocOL` s3
316 `appOL` retStmt, top1 ++ top2 ++ top3)
319 -- | Conversion of call arguments.
322 -> ([LlvmVar], LlvmStatements, [LlvmCmmTop])
323 -> UniqSM (LlvmEnv, [LlvmVar], LlvmStatements, [LlvmCmmTop])
325 arg_vars env [] (vars, stmts, tops)
326 = return (env, vars, stmts, tops)
328 arg_vars env (CmmHinted e AddrHint:rest) (vars, stmts, tops)
329 = do (env', v1, stmts', top') <- exprToVar env e
330 let op = case getVarType v1 of
331 ty | isPointer ty -> LM_Bitcast
332 ty | isInt ty -> LM_Inttoptr
334 a -> panic $ "genCall: Can't cast llvmType to i8*! ("
337 (v2, s1) <- doExpr i8Ptr $ Cast op v1 i8Ptr
338 arg_vars env' rest (vars ++ [v2], stmts `appOL` stmts' `snocOL` s1,
341 arg_vars env (CmmHinted e _:rest) (vars, stmts, tops)
342 = do (env', v1, stmts', top') <- exprToVar env e
343 arg_vars env' rest (vars ++ [v1], stmts `appOL` stmts', tops ++ top')
345 -- | Decide what C function to use to implement a CallishMachOp
346 cmmPrimOpFunctions :: CallishMachOp -> FastString
347 cmmPrimOpFunctions mop
349 MO_F32_Exp -> fsLit "expf"
350 MO_F32_Log -> fsLit "logf"
351 MO_F32_Sqrt -> fsLit "sqrtf"
352 MO_F32_Pwr -> fsLit "powf"
354 MO_F32_Sin -> fsLit "sinf"
355 MO_F32_Cos -> fsLit "cosf"
356 MO_F32_Tan -> fsLit "tanf"
358 MO_F32_Asin -> fsLit "asinf"
359 MO_F32_Acos -> fsLit "acosf"
360 MO_F32_Atan -> fsLit "atanf"
362 MO_F32_Sinh -> fsLit "sinhf"
363 MO_F32_Cosh -> fsLit "coshf"
364 MO_F32_Tanh -> fsLit "tanhf"
366 MO_F64_Exp -> fsLit "exp"
367 MO_F64_Log -> fsLit "log"
368 MO_F64_Sqrt -> fsLit "sqrt"
369 MO_F64_Pwr -> fsLit "pow"
371 MO_F64_Sin -> fsLit "sin"
372 MO_F64_Cos -> fsLit "cos"
373 MO_F64_Tan -> fsLit "tan"
375 MO_F64_Asin -> fsLit "asin"
376 MO_F64_Acos -> fsLit "acos"
377 MO_F64_Atan -> fsLit "atan"
379 MO_F64_Sinh -> fsLit "sinh"
380 MO_F64_Cosh -> fsLit "cosh"
381 MO_F64_Tanh -> fsLit "tanh"
383 a -> panic $ "cmmPrimOpFunctions: Unknown callish op! (" ++ show a ++ ")"
386 -- | Tail function calls
387 genJump :: LlvmEnv -> CmmExpr -> UniqSM StmtData
389 -- Call to known function
390 genJump env (CmmLit (CmmLabel lbl)) = do
391 (env', vf, stmts, top) <- getHsFunc env lbl
392 (stgRegs, stgStmts) <- funEpilogue
393 let s1 = Expr $ Call TailCall vf stgRegs llvmStdFunAttrs
394 let s2 = Return Nothing
395 return (env', stmts `appOL` stgStmts `snocOL` s1 `snocOL` s2, top)
398 -- Call to unknown function / address
399 genJump env expr = do
401 (env', vf, stmts, top) <- exprToVar env expr
403 let cast = case getVarType vf of
404 ty | isPointer ty -> LM_Bitcast
405 ty | isInt ty -> LM_Inttoptr
407 ty -> panic $ "genJump: Expr is of bad type for function call! ("
410 (v1, s1) <- doExpr (pLift fty) $ Cast cast vf (pLift fty)
411 (stgRegs, stgStmts) <- funEpilogue
412 let s2 = Expr $ Call TailCall v1 stgRegs llvmStdFunAttrs
413 let s3 = Return Nothing
414 return (env', stmts `snocOL` s1 `appOL` stgStmts `snocOL` s2 `snocOL` s3,
418 -- | CmmAssign operation
420 -- We use stack allocated variables for CmmReg. The optimiser will replace
421 -- these with registers when possible.
422 genAssign :: LlvmEnv -> CmmReg -> CmmExpr -> UniqSM StmtData
423 genAssign env reg val = do
424 let (env1, vreg, stmts1, top1) = getCmmReg env reg
425 (env2, vval, stmts2, top2) <- exprToVar env1 val
426 let s1 = Store vval vreg
427 return (env2, stmts1 `appOL` stmts2 `snocOL` s1, top1 ++ top2)
430 -- | CmmStore operation
431 genStore :: LlvmEnv -> CmmExpr -> CmmExpr -> UniqSM StmtData
432 genStore env addr val = do
433 (env1, vaddr, stmts1, top1) <- exprToVar env addr
434 (env2, vval, stmts2, top2) <- exprToVar env1 val
435 if getVarType vaddr == llvmWord
437 let vty = pLift $ getVarType vval
438 (vptr, s1) <- doExpr vty $ Cast LM_Inttoptr vaddr vty
439 let s2 = Store vval vptr
440 return (env2, stmts1 `appOL` stmts2 `snocOL` s1 `snocOL` s2,
444 panic $ "genStore: ptr not of word size! (" ++ show vaddr ++ ")"
447 -- | Unconditional branch
448 genBranch :: LlvmEnv -> BlockId -> UniqSM StmtData
450 let label = blockIdToLlvm id
451 in return (env, unitOL $ Branch label, [])
454 -- | Conditional branch
455 genCondBranch :: LlvmEnv -> CmmExpr -> BlockId -> UniqSM StmtData
456 genCondBranch env cond idT = do
458 let labelT = blockIdToLlvm idT
459 let labelF = LMLocalVar idF LMLabel
460 (env', vc, stmts, top) <- exprToVarOpt env i1Option cond
461 if getVarType vc == i1
463 let s1 = BranchIf vc labelT labelF
465 return $ (env', stmts `snocOL` s1 `snocOL` s2, top)
467 panic $ "genCondBranch: Cond expr not bool! (" ++ show vc ++ ")"
472 -- N.B. we remove Nothing's from the list of branches, as they are 'undefined'.
473 -- However, they may be defined one day, so we better document this behaviour.
474 genSwitch :: LlvmEnv -> CmmExpr -> [Maybe BlockId] -> UniqSM StmtData
475 genSwitch env cond maybe_ids = do
476 (env', vc, stmts, top) <- exprToVar env cond
477 let ty = getVarType vc
479 let pairs = [ (ix, id) | (ix,Just id) <- zip ([0..]::[Integer]) maybe_ids ]
480 let labels = map (\(ix, b) -> (mkIntLit ix ty, blockIdToLlvm b)) pairs
481 -- out of range is undefied, so lets just branch to first label
482 let (_, defLbl) = head labels
484 let s1 = Switch vc defLbl labels
485 return $ (env', stmts `snocOL` s1, top)
488 -- -----------------------------------------------------------------------------
489 -- * CmmExpr code generation
492 -- | An expression conversion return data:
493 -- * LlvmEnv: The new enviornment
494 -- * LlvmVar: The var holding the result of the expression
495 -- * LlvmStatements: Any statements needed to evaluate the expression
496 -- * LlvmCmmTop: Any global data needed for this expression
497 type ExprData = (LlvmEnv, LlvmVar, LlvmStatements, [LlvmCmmTop])
499 -- | Values which can be passed to 'exprToVar' to configure its
500 -- behaviour in certain circumstances.
501 data EOption = EOption {
502 -- | The expected LlvmType for the returned variable.
504 -- Currently just used for determining if a comparison should return
505 -- a boolean (i1) or a int (i32/i64).
506 eoExpectedType :: Maybe LlvmType
510 i1Option = EOption (Just i1)
512 wordOption :: EOption
513 wordOption = EOption (Just llvmWord)
516 -- | Convert a CmmExpr to a list of LlvmStatements with the result of the
517 -- expression being stored in the returned LlvmVar.
518 exprToVar :: LlvmEnv -> CmmExpr -> UniqSM ExprData
519 exprToVar env = exprToVarOpt env wordOption
521 exprToVarOpt :: LlvmEnv -> EOption -> CmmExpr -> UniqSM ExprData
522 exprToVarOpt env opt e = case e of
528 -> genCmmLoad env e' ty
530 -- Cmmreg in expression is the value, so must load. If you want actual
531 -- reg pointer, call getCmmReg directly.
533 let (env', vreg, stmts, top) = getCmmReg env r
534 (v1, s1) <- doExpr (pLower $ getVarType vreg) $ Load vreg
535 return (env', v1, stmts `snocOL` s1 , top)
538 -> genMachOp env opt op exprs
541 -> exprToVar env $ expandCmmReg (r, i)
544 -> panic "exprToVar: CmmStackSlot not supported!"
547 -- | Handle CmmMachOp expressions
548 genMachOp :: LlvmEnv -> EOption -> MachOp -> [CmmExpr] -> UniqSM ExprData
551 genMachOp env _ op [x] = case op of
554 let all1 = mkIntLit (-1::Int) (widthToLlvmInt w)
555 in negate (widthToLlvmInt w) all1 LM_MO_Xor
558 let all0 = mkIntLit (0::Int) (widthToLlvmInt w)
559 in negate (widthToLlvmInt w) all0 LM_MO_Sub
562 let all0 = LMLitVar $ LMFloatLit (-0) (widthToLlvmFloat w)
563 in negate (widthToLlvmFloat w) all0 LM_MO_Sub
565 MO_SF_Conv _ w -> fiConv (widthToLlvmFloat w) LM_Sitofp
566 MO_FS_Conv _ w -> fiConv (widthToLlvmInt w) LM_Fptosi
569 -> sameConv from (widthToLlvmInt to) LM_Trunc LM_Sext
572 -> sameConv from (widthToLlvmInt to) LM_Trunc LM_Zext
575 -> sameConv from (widthToLlvmFloat to) LM_Fptrunc LM_Fpext
577 a -> panic $ "genMachOp: unmatched unary CmmMachOp! (" ++ show a ++ ")"
580 negate ty v2 negOp = do
581 (env', vx, stmts, top) <- exprToVar env x
582 (v1, s1) <- doExpr ty $ LlvmOp negOp v2 vx
583 return (env', v1, stmts `snocOL` s1, top)
585 fiConv ty convOp = do
586 (env', vx, stmts, top) <- exprToVar env x
587 (v1, s1) <- doExpr ty $ Cast convOp vx ty
588 return (env', v1, stmts `snocOL` s1, top)
590 sameConv from ty reduce expand = do
591 x'@(env', vx, stmts, top) <- exprToVar env x
592 let sameConv' op = do
593 (v1, s1) <- doExpr ty $ Cast op vx ty
594 return (env', v1, stmts `snocOL` s1, top)
595 let toWidth = llvmWidthInBits ty
596 -- LLVM doesn't like trying to convert to same width, so
597 -- need to check for that as we do get cmm code doing it.
598 case widthInBits from of
599 w | w < toWidth -> sameConv' expand
600 w | w > toWidth -> sameConv' reduce
605 genMachOp env opt op [x, y] = case op of
607 MO_Eq _ -> genBinComp opt LM_CMP_Eq
608 MO_Ne _ -> genBinComp opt LM_CMP_Ne
610 MO_S_Gt _ -> genBinComp opt LM_CMP_Sgt
611 MO_S_Ge _ -> genBinComp opt LM_CMP_Sge
612 MO_S_Lt _ -> genBinComp opt LM_CMP_Slt
613 MO_S_Le _ -> genBinComp opt LM_CMP_Sle
615 MO_U_Gt _ -> genBinComp opt LM_CMP_Ugt
616 MO_U_Ge _ -> genBinComp opt LM_CMP_Uge
617 MO_U_Lt _ -> genBinComp opt LM_CMP_Ult
618 MO_U_Le _ -> genBinComp opt LM_CMP_Ule
620 MO_Add _ -> genBinMach LM_MO_Add
621 MO_Sub _ -> genBinMach LM_MO_Sub
622 MO_Mul _ -> genBinMach LM_MO_Mul
624 MO_U_MulMayOflo _ -> panic "genMachOp: MO_U_MulMayOflo unsupported!"
626 MO_S_MulMayOflo w -> isSMulOK w x y
628 MO_S_Quot _ -> genBinMach LM_MO_SDiv
629 MO_S_Rem _ -> genBinMach LM_MO_SRem
631 MO_U_Quot _ -> genBinMach LM_MO_UDiv
632 MO_U_Rem _ -> genBinMach LM_MO_URem
634 MO_F_Eq _ -> genBinComp opt LM_CMP_Feq
635 MO_F_Ne _ -> genBinComp opt LM_CMP_Fne
636 MO_F_Gt _ -> genBinComp opt LM_CMP_Fgt
637 MO_F_Ge _ -> genBinComp opt LM_CMP_Fge
638 MO_F_Lt _ -> genBinComp opt LM_CMP_Flt
639 MO_F_Le _ -> genBinComp opt LM_CMP_Fle
641 MO_F_Add _ -> genBinMach LM_MO_Add
642 MO_F_Sub _ -> genBinMach LM_MO_Sub
643 MO_F_Mul _ -> genBinMach LM_MO_Mul
644 MO_F_Quot _ -> genBinMach LM_MO_FDiv
646 MO_And _ -> genBinMach LM_MO_And
647 MO_Or _ -> genBinMach LM_MO_Or
648 MO_Xor _ -> genBinMach LM_MO_Xor
649 MO_Shl _ -> genBinMach LM_MO_Shl
650 MO_U_Shr _ -> genBinMach LM_MO_LShr
651 MO_S_Shr _ -> genBinMach LM_MO_AShr
653 a -> panic $ "genMachOp: unmatched binary CmmMachOp! (" ++ show a ++ ")"
656 binLlvmOp ty binOp = do
657 (env1, vx, stmts1, top1) <- exprToVar env x
658 (env2, vy, stmts2, top2) <- exprToVar env1 y
659 if getVarType vx == getVarType vy
661 (v1, s1) <- doExpr (ty vx) $ binOp vx vy
662 return (env2, v1, stmts1 `appOL` stmts2 `snocOL` s1,
666 -- XXX: Error. Continue anyway so we can debug the generated
668 let cmmToStr = (lines . show . llvmSDoc . PprCmm.pprExpr)
669 let dx = Comment $ map fsLit $ cmmToStr x
670 let dy = Comment $ map fsLit $ cmmToStr y
671 (v1, s1) <- doExpr (ty vx) $ binOp vx vy
672 let allStmts = stmts1 `appOL` stmts2 `snocOL` dx
673 `snocOL` dy `snocOL` s1
674 return (env2, v1, allStmts, top1 ++ top2)
676 -- let o = case binOp vx vy of
677 -- Compare op _ _ -> show op
678 -- LlvmOp op _ _ -> show op
680 -- panic $ "genMachOp: comparison between different types ("
681 -- ++ o ++ " "++ show vx ++ ", " ++ show vy ++ ")"
682 -- ++ "\ne1: " ++ (show.llvmSDoc.PprCmm.pprExpr $ x)
683 -- ++ "\ne2: " ++ (show.llvmSDoc.PprCmm.pprExpr $ y)
685 -- | Need to use EOption here as Cmm expects word size results from
686 -- comparisons while llvm return i1. Need to extend to llvmWord type
688 genBinComp opt cmp = do
689 ed@(env', v1, stmts, top) <- binLlvmOp (\_ -> i1) $ Compare cmp
691 if getVarType v1 == i1
693 case eoExpectedType opt of
701 (v2, s1) <- doExpr t $ Cast LM_Zext v1 t
702 return (env', v2, stmts `snocOL` s1, top)
705 panic $ "genBinComp: Can't case i1 compare"
706 ++ "res to non int type " ++ show (t)
708 panic $ "genBinComp: Compare returned type other then i1! "
709 ++ (show $ getVarType v1)
711 genBinMach op = binLlvmOp getVarType (LlvmOp op)
713 -- | Detect if overflow will occur in signed multiply of the two
714 -- CmmExpr's. This is the LLVM assembly equivalent of the NCG
715 -- implementation. Its much longer due to type information/safety.
716 -- This should actually compile to only about 3 asm instructions.
717 isSMulOK :: Width -> CmmExpr -> CmmExpr -> UniqSM ExprData
719 (env1, vx, stmts1, top1) <- exprToVar env x
720 (env2, vy, stmts2, top2) <- exprToVar env1 y
722 let word = getVarType vx
723 let word2 = LMInt $ 2 * (llvmWidthInBits $ getVarType vx)
724 let shift = llvmWidthInBits word
725 let shift1 = mkIntLit (shift - 1) llvmWord
726 let shift2 = mkIntLit shift llvmWord
730 (x1, s1) <- doExpr word2 $ Cast LM_Sext vx word2
731 (y1, s2) <- doExpr word2 $ Cast LM_Sext vy word2
732 (r1, s3) <- doExpr word2 $ LlvmOp LM_MO_Mul x1 y1
733 (rlow1, s4) <- doExpr word $ Cast LM_Trunc r1 word
734 (rlow2, s5) <- doExpr word $ LlvmOp LM_MO_AShr rlow1 shift1
735 (rhigh1, s6) <- doExpr word2 $ LlvmOp LM_MO_AShr r1 shift2
736 (rhigh2, s7) <- doExpr word $ Cast LM_Trunc rhigh1 word
737 (dst, s8) <- doExpr word $ LlvmOp LM_MO_Sub rlow2 rhigh2
738 let stmts = (unitOL s1) `snocOL` s2 `snocOL` s3 `snocOL` s4
739 `snocOL` s5 `snocOL` s6 `snocOL` s7 `snocOL` s8
740 return (env2, dst, stmts1 `appOL` stmts2 `appOL` stmts,
744 panic $ "isSMulOK: Not bit type! (" ++ show word ++ ")"
747 -- More then two expression, invalid!
748 genMachOp _ _ _ _ = panic "genMachOp: More then 2 expressions in MachOp!"
751 -- | Handle CmmLoad expression
752 genCmmLoad :: LlvmEnv -> CmmExpr -> CmmType -> UniqSM ExprData
753 genCmmLoad env e ty = do
754 (env', iptr, stmts, tops) <- exprToVar env e
755 let ety = getVarType iptr
757 True | llvmPtrBits == llvmWidthInBits ety -> do
758 let pty = LMPointer $ cmmToLlvmType ty
759 (ptr, cast) <- doExpr pty $ Cast LM_Inttoptr iptr pty
760 (dvar, load) <- doExpr (cmmToLlvmType ty) $ Load ptr
761 return (env', dvar, stmts `snocOL` cast `snocOL` load, tops)
765 ("exprToVar: can't cast to pointer as int not of "
767 (PprCmm.pprExpr e <+> text (
768 "Size of Ptr: " ++ show llvmPtrBits ++
769 ", Size of var: " ++ show (llvmWidthInBits ety) ++
770 ", Var: " ++ show iptr))
772 False -> panic "exprToVar: CmmLoad expression is not of type int!"
775 -- | Handle CmmReg expression
777 -- We allocate CmmReg on the stack. This avoids having to map a CmmReg to an
778 -- equivalent SSA form and avoids having to deal with Phi node insertion.
779 -- This is also the approach recommended by llvm developers.
780 getCmmReg :: LlvmEnv -> CmmReg -> ExprData
781 getCmmReg env r@(CmmLocal (LocalReg un _))
782 = let exists = varLookup un env
784 (newv, stmts) = allocReg r
785 nenv = varInsert un (pLower $ getVarType newv) env
787 Just ety -> (env, (LMLocalVar un $ pLift ety), nilOL, [])
788 Nothing -> (nenv, newv, stmts, [])
790 getCmmReg env (CmmGlobal g) = (env, lmGlobalRegVar g, nilOL, [])
793 -- | Allocate a CmmReg on the stack
794 allocReg :: CmmReg -> (LlvmVar, LlvmStatements)
795 allocReg (CmmLocal (LocalReg un ty))
796 = let ty' = cmmToLlvmType ty
797 var = LMLocalVar un (LMPointer ty')
799 in (var, unitOL $ Assignment var alc)
801 allocReg _ = panic $ "allocReg: Global reg encountered! Global registers should"
802 ++ " have been handled elsewhere!"
805 -- | Generate code for a literal
806 genLit :: LlvmEnv -> CmmLit -> UniqSM ExprData
807 genLit env (CmmInt i w)
808 = return (env, mkIntLit i (LMInt $ widthInBits w), nilOL, [])
810 genLit env (CmmFloat r w)
811 = return (env, LMLitVar $ LMFloatLit (fromRational r) (widthToLlvmFloat w),
814 genLit env cmm@(CmmLabel l)
815 = let label = strCLabel_llvm l
816 ty = funLookup label env
817 lmty = cmmToLlvmType $ cmmLitType cmm
819 -- Make generic external label defenition and then pointer to it
821 let glob@(var, _) = genStringLabelRef label
822 let ldata = [CmmData Data [([glob], [])]]
823 let env' = funInsert label (pLower $ getVarType var) env
824 (v1, s1) <- doExpr lmty $ Cast LM_Ptrtoint var llvmWord
825 return (env', v1, unitOL s1, ldata)
826 -- Referenced data exists in this module, retrieve type and make
829 let var = LMGlobalVar label (LMPointer ty')
830 ExternallyVisible Nothing Nothing
831 (v1, s1) <- doExpr lmty $ Cast LM_Ptrtoint var llvmWord
832 return (env, v1, unitOL s1, [])
834 genLit env (CmmLabelOff label off) = do
835 (env', vlbl, stmts, stat) <- genLit env (CmmLabel label)
836 let voff = mkIntLit off llvmWord
837 (v1, s1) <- doExpr (getVarType vlbl) $ LlvmOp LM_MO_Add vlbl voff
838 return (env', v1, stmts `snocOL` s1, stat)
840 genLit env (CmmLabelDiffOff l1 l2 off) = do
841 (env1, vl1, stmts1, stat1) <- genLit env (CmmLabel l1)
842 (env2, vl2, stmts2, stat2) <- genLit env1 (CmmLabel l2)
843 let voff = mkIntLit off llvmWord
844 let ty1 = getVarType vl1
845 let ty2 = getVarType vl2
846 if (isInt ty1) && (isInt ty2)
847 && (llvmWidthInBits ty1 == llvmWidthInBits ty2)
850 (v1, s1) <- doExpr (getVarType vl1) $ LlvmOp LM_MO_Sub vl1 vl2
851 (v2, s2) <- doExpr (getVarType v1 ) $ LlvmOp LM_MO_Add v1 voff
852 return (env2, v2, stmts1 `appOL` stmts2 `snocOL` s1 `snocOL` s2,
856 panic "genLit: CmmLabelDiffOff encountered with different label ty!"
858 genLit env (CmmBlock b)
859 = genLit env (CmmLabel $ infoTblLbl b)
861 genLit _ CmmHighStackMark
862 = panic "genStaticLit - CmmHighStackMark unsupported!"
865 -- -----------------------------------------------------------------------------
869 -- | Function prologue. Load STG arguments into variables for function.
870 funPrologue :: [LlvmStatement]
871 funPrologue = concat $ map getReg activeStgRegs
873 let reg = lmGlobalRegVar rr
874 arg = lmGlobalRegArg rr
875 alloc = Assignment reg $ Alloca (pLower $ getVarType reg) 1
876 store = Store arg reg
880 -- | Function epilogue. Load STG variables to use as argument for call.
881 funEpilogue :: UniqSM ([LlvmVar], LlvmStatements)
884 (v,s) <- doExpr (pLower $ getVarType r) $ Load r
886 loads <- mapM (loadExpr . lmGlobalRegVar) activeStgRegs
887 let (vars, stmts) = unzip loads
888 return (vars, concatOL stmts)
891 -- | Get a function pointer to the CLabel specified.
893 -- This is for Haskell functions, function type is assumed, so doesn't work
894 -- with foreign functions.
895 getHsFunc :: LlvmEnv -> CLabel -> UniqSM ExprData
897 = let fname = strCLabel_llvm lbl
898 ty = funLookup fname env
900 Just ty'@(LMFunction sig) -> do
901 -- Function in module in right form
902 let fun = LMGlobalVar fname ty' (funcLinkage sig) Nothing Nothing
903 return (env, fun, nilOL, [])
905 -- label in module but not function pointer, convert
906 let fun = LMGlobalVar fname (pLift ty') ExternallyVisible
908 (v1, s1) <- doExpr (pLift llvmFunTy) $
909 Cast LM_Bitcast fun (pLift llvmFunTy)
910 return (env, v1, unitOL s1, [])
912 -- label not in module, create external reference
913 let ty' = LMFunction $ llvmFunSig lbl ExternallyVisible
914 let fun = LMGlobalVar fname ty' ExternallyVisible Nothing Nothing
915 let top = CmmData Data [([],[ty'])]
916 let env' = funInsert fname ty' env
917 return (env', fun, nilOL, [top])
920 -- | Create a new local var
921 mkLocalVar :: LlvmType -> UniqSM LlvmVar
924 return $ LMLocalVar un ty
927 -- | Execute an expression, assigning result to a var
928 doExpr :: LlvmType -> LlvmExpression -> UniqSM (LlvmVar, LlvmStatement)
931 return (v, Assignment v expr)
934 -- | Expand CmmRegOff
935 expandCmmReg :: (CmmReg, Int) -> CmmExpr
936 expandCmmReg (reg, off)
937 = let width = typeWidth (cmmRegType reg)
938 voff = CmmLit $ CmmInt (fromIntegral off) width
939 in CmmMachOp (MO_Add width) [CmmReg reg, voff]
942 -- | Convert a block id into a appropriate Llvm label
943 blockIdToLlvm :: BlockId -> LlvmVar
944 blockIdToLlvm bid = LMLocalVar (getUnique bid) LMLabel
947 -- | Create Llvm int Literal
948 mkIntLit :: Integral a => a -> LlvmType -> LlvmVar
949 mkIntLit i ty = LMLitVar $ LMIntLit (toInteger i) ty
954 panic s = Outputable.panic $ "LlvmCodeGen.CodeGen." ++ s
956 pprPanic :: String -> SDoc -> a
957 pprPanic s d = Outputable.pprPanic ("LlvmCodeGen.CodeGen." ++ s) d