{-# LANGUAGE NamedFieldPuns #-} {- This funny module was reduced from a failing build of stage2 using the new code generator and the linear register allocator, with this bug: "inplace/bin/ghc-stage1" -fPIC -dynamic -H32m -O -Wall -H64m -O0 -package-name ghc-7.1.20110414 -hide-all-packages -i -icompiler/basicTypes -icompiler/cmm -icompiler/codeGen -icompiler/coreSyn -icompiler/deSugar -icompiler/ghci -icompiler/hsSyn -icompiler/iface -icompiler/llvmGen -icompiler/main -icompiler/nativeGen -icompiler/parser -icompiler/prelude -icompiler/profiling -icompiler/rename -icompiler/simplCore -icompiler/simplStg -icompiler/specialise -icompiler/stgSyn -icompiler/stranal -icompiler/typecheck -icompiler/types -icompiler/utils -icompiler/vectorise -icompiler/stage2/build -icompiler/stage2/build/autogen -Icompiler/stage2/build -Icompiler/stage2/build/autogen -Icompiler/../libffi/build/include -Icompiler/stage2 -Icompiler/../libraries/base/cbits -Icompiler/../libraries/base/include -Icompiler/. -Icompiler/parser -Icompiler/utils -optP-DHAVE_INTERNAL_INTERPRETER -optP-include -optPcompiler/stage2/build/autogen/cabal_macros.h -package Cabal-1.11.0 -package array-0.3.0.2 -package base-4.3.1.0 -package ghc-boot-0.0.0.0 -package bytestring-0.9.1.10 -package containers-0.4.0.0 -package directory-1.1.0.0 -package filepath-1.2.0.0 -package hoopl-3.8.7.0 -package hpc-0.5.0.6 -package old-time-1.0.0.6 -package process-1.0.1.4 -package template-haskell-2.5.0.0 -package unix-2.4.1.0 -Wall -fno-warn-name-shadowing -fno-warn-orphans -XHaskell98 -XNondecreasingIndentation -XCPP -XMagicHash -XUnboxedTuples -XPatternGuards -XForeignFunctionInterface -XEmptyDataDecls -XTypeSynonymInstances -XMultiParamTypeClasses -XFlexibleInstances -XRank2Types -XScopedTypeVariables -XDeriveDataTypeable -DSTAGE=2 -O2 -O -DGHC_DEFAULT_NEW_CODEGEN -no-user-package-db -rtsopts -odir compiler/stage2/build -hidir compiler/stage2/build -stubdir compiler/stage2/build -hisuf dyn_hi -osuf dyn_o -hcsuf dyn_hc -c compiler/main/DriverPipeline.hs -o compiler/stage2/build/DriverPipeline.dyn_o -fforce-recomp -dno-debug-output -fno-warn-unused-binds ghc-stage1: panic! (the 'impossible' happened) (GHC version 7.1.20110414 for x86_64-unknown-linux): Cannot patch JMP_TBL This panic only appears to show up on x86-64 and with -fPIC. I wasn't able to get the produced optimized C-- to crash the linear register allocator. To see the bug, you need some extra patches for the new code generator, in particular, this set (which can be acquired from the jmp_tbl_bug tag at ): commit 7b275c93df7944f0a9b51034cf1f64e3e70582a5 Author: Edward Z. Yang Date: Thu Apr 14 21:20:21 2011 +0100 Give manifestSP better information about the actual SP location. This patch fixes silliness where the SP pointer is continually bumped up and down. Signed-off-by: Edward Z. Yang commit 5b5add4246d3997670ae995f7d2a028db92fff95 Author: Edward Z. Yang Date: Wed Apr 13 11:16:36 2011 +0100 Generalized assignment rewriting pass. This assignment rewriting pass subsumes the previous reload sinking pass, and also performs basic inlining. Signed-off-by: Edward Z. Yang The ostensible cause is that the linear register allocator is getting really unlucky and needs to insert a fixup block after precisely one jump in a jump table, because the block it jumps to was processed already. As you can see, actually getting the linear register allocator into this funk is /very/ difficult. -} module DriverPipeline (compileFile) where import Control.Exception import Control.Applicative (Applicative(..)) import Control.Monad (liftM, ap) data Phase = Unlit () | Ccpp | Cc | Cobjc | HCc | SplitAs | As | LlvmOpt | LlvmLlc | LlvmMangle | MergeStub | StopLn deriving (Show) data PipeState = PipeState { stop_phase :: Phase, src_basename :: String, output_spec :: (), hsc_env :: Maybe String, maybe_loc :: Maybe String } newtype CompPipeline a = P { unP :: PipeState -> IO (PipeState, a) } instance Functor CompPipeline where fmap = liftM instance Applicative CompPipeline where pure a = P $ \state -> return (state, a) (<*>) = ap instance Monad CompPipeline where P m >>= k = P $ \state -> do (state',a) <- m state unP (k a) state' eqPhase :: Phase -> Phase -> Bool eqPhase (Unlit _) (Unlit _) = True eqPhase Ccpp Ccpp = True eqPhase Cc Cc = True eqPhase HCc HCc = True eqPhase SplitAs SplitAs = True eqPhase As As = True eqPhase LlvmOpt LlvmOpt = True eqPhase LlvmLlc LlvmLlc = True eqPhase LlvmMangle LlvmMangle = True eqPhase MergeStub MergeStub = True eqPhase StopLn StopLn = True eqPhase _ _ = False compileFile start_phase state = do unP (pipeLoop start_phase) state getOutputFilename undefined undefined undefined undefined undefined undefined pipeLoop phase = do dflags@PipeState{stop_phase} <- getPipeState io $ evaluate (phase `eqPhase` stop_phase) runPhase phase dflags pipeLoop phase getOutputFilename :: Phase -> () -> String -> Maybe String -> Phase -> Maybe String -> IO String getOutputFilename p o b md p' ml | p' `eqPhase` p, () <- o = undefined | Just l <- ml = return l | Just d <- md = return $ d ++ b | otherwise = undefined runPhase p _ | p `eqPhase` Cc || p `eqPhase` Ccpp || p `eqPhase` HCc || p `eqPhase` Cobjc = undefined runPhase LlvmMangle _ = undefined runPhase SplitAs _ = undefined runPhase LlvmOpt _ = undefined runPhase LlvmLlc dflags = phaseOutputFilename >> io (evaluate dflags) >> return undefined runPhase MergeStub _ = phaseOutputFilename >> undefined runPhase other _ = io (evaluate (show other)) >> undefined phaseOutputFilename :: CompPipeline () phaseOutputFilename = do PipeState{stop_phase, src_basename, output_spec, maybe_loc, hsc_env} <- getPipeState io $ getOutputFilename stop_phase output_spec src_basename hsc_env StopLn maybe_loc getPipeState = P $ \state -> return (state, state) io m = P $ \state -> do a <- m; return (state, ())