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Diffstat (limited to 'testsuite/tests/codeGen/should_compile/jmp_tbl.hs')
| -rw-r--r-- | testsuite/tests/codeGen/should_compile/jmp_tbl.hs | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/testsuite/tests/codeGen/should_compile/jmp_tbl.hs b/testsuite/tests/codeGen/should_compile/jmp_tbl.hs new file mode 100644 index 0000000000..56904ed7a1 --- /dev/null +++ b/testsuite/tests/codeGen/should_compile/jmp_tbl.hs @@ -0,0 +1,128 @@ +{-# 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-DGHCI -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 bin-package-db-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 -DGHCI_TABLES_NEXT_TO_CODE -DSTAGE=2 -O2 -O -DGHC_DEFAULT_NEW_CODEGEN -no-user-package-conf -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 <https://github.com/ezyang/ghc>): + + commit 7b275c93df7944f0a9b51034cf1f64e3e70582a5 + Author: Edward Z. Yang <ezyang@mit.edu> + 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 <ezyang@mit.edu> + + commit 5b5add4246d3997670ae995f7d2a028db92fff95 + Author: Edward Z. Yang <ezyang@mit.edu> + 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 <ezyang@mit.edu> + +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 + +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 Monad CompPipeline where + return a = P $ \state -> return (state, a) + 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, ()) |