Hannes Siebenhandl pushed to branch wip/fendor/revert-backtrace-decoder at Glasgow Haskell Compiler / GHC

Commits:

18 changed files:

Changes:

  • libraries/base/src/GHC/Stack/CloneStack.hs
    ... ... @@ -17,4 +17,3 @@ module GHC.Stack.CloneStack (
    17 17 
       ) where
    18 18
    19 19 
     import GHC.Internal.Stack.CloneStack
    20 
    -import GHC.Internal.Stack.Decode

  • libraries/ghc-internal/cbits/Stack.cmm
    ... ... @@ -146,14 +146,14 @@ isArgGenBigRetFunTypezh(P_ stack, W_ offsetWords) {
    146 146 
       return (type);
    147 147 
     }
    148 148
    149 
    -// (StgInfoTable*, StgInfoTable*) getInfoTableAddrszh(StgStack* stack, StgWord offsetWords)
    150 
    -getInfoTableAddrszh(P_ stack, W_ offsetWords) {
    151 
    -  P_ p, info_struct, info_ptr_ipe_key;
    149 
    +// (StgInfoTable*) getInfoTableAddrzh(StgStack* stack, StgWord offsetWords)
    150 
    +getInfoTableAddrzh(P_ stack, W_ offsetWords) {
    151 
    +  P_ p, info;
    152 152 
       p = StgStack_sp(stack) + WDS(offsetWords);
    153 153 
       ASSERT(LOOKS_LIKE_CLOSURE_PTR(p));
    154 
    -  info_struct = %GET_STD_INFO(UNTAG(p));
    155 
    -  info_ptr_ipe_key = %INFO_PTR(UNTAG(p));
    156 
    -  return (info_struct, info_ptr_ipe_key);
    154 
    +  info = %GET_STD_INFO(UNTAG(p));
    155 
    +
    156 
    +  return (info);
    157 157 
     }
    158 158
    159 159 
     // (StgInfoTable*) getStackInfoTableAddrzh(StgStack* stack)

  • libraries/ghc-internal/cbits/StackCloningDecoding.cmm
    ... ... @@ -17,3 +17,10 @@ stg_sendCloneStackMessagezh (gcptr threadId, gcptr mVarStablePtr) {
    17 17
    18 18 
         return ();
    19 19 
     }
    20 
    +
    21 
    +stg_decodeStackzh (gcptr stgStack) {
    22 
    +    gcptr stackEntries;
    23 
    +    ("ptr" stackEntries) = ccall decodeClonedStack(MyCapability() "ptr", stgStack "ptr");
    24 
    +
    25 
    +    return (stackEntries);
    26 
    +}

  • libraries/ghc-internal/cbits/Stack_c.c
    ... ... @@ -30,7 +30,7 @@ StgStack *getUnderflowFrameStack(StgStack *stack, StgWord offset) {
    30 30 
     const StgInfoTable *getItbl(StgClosure *closure) {
    31 31 
       ASSERT(LOOKS_LIKE_CLOSURE_PTR(closure));
    32 32 
       return get_itbl(closure);
    33 
    -}
    33 
    +};
    34 34
    35 35 
     StgWord getBitmapSize(StgClosure *c) {
    36 36 
       ASSERT(LOOKS_LIKE_CLOSURE_PTR(c));

  • libraries/ghc-internal/jsbits/base.js
    ... ... @@ -1245,21 +1245,9 @@ function h$mkdir(path, path_offset, mode) {
    1245 1245
    1246 1246 
     // It is required by Google Closure Compiler to be at least defined if
    1247 1247 
     // somewhere it is used
    1248 
    -var h$stg_cloneMyStackzh,
    1249 
    -    h$advanceStackFrameLocationzh, h$getStackFieldszh, h$getStackClosurezh,
    1250 
    -    h$getWordzh, h$getStackInfoTableAddrzh, h$getRetFunSmallBitmapzh, h$getRetFunLargeBitmapzh,
    1251 
    -    h$isArgGenBigRetFunTypezh,
    1252 
    -    h$getUnderflowFrameNextChunkzh,
    1253 
    -    h$getInfoTableAddrszh,
    1254 
    -    h$getLargeBitmapzh, h$getSmallBitmapzh, h$getBCOLargeBitmapzh
    1248 
    +var h$stg_cloneMyStackzh, h$stg_decodeStackzh
    1255 1249 
     h$stg_cloneMyStackzh
    1256 
    -  = h$advanceStackFrameLocationzh
    1257 
    -  = h$getStackFieldszh = h$getStackClosurezh
    1258 
    -  = h$getWordzh, h$getStackInfoTableAddrzh = h$getRetFunSmallBitmapzh = h$getRetFunLargeBitmapzh
    1259 
    -  = h$isArgGenBigRetFunTypezh
    1260 
    -  = h$getUnderflowFrameNextChunkzh
    1261 
    -  = h$getInfoTableAddrszh
    1262 
    -  = h$getLargeBitmapzh = h$getSmallBitmapzh = h$getBCOLargeBitmapzh
    1250 
    +  = h$stg_decodeStackzh
    1263 1251 
       = function () {
    1264 1252 
         throw new Error('Stack Cloning Decoding: Not Implemented Yet')
    1265 1253 
       }

  • libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
    ... ... @@ -16,7 +16,6 @@ import GHC.Internal.Stack.Types as GHC.Stack (CallStack, HasCallStack)
    16 16 
     import qualified GHC.Internal.Stack as HCS
    17 17 
     import qualified GHC.Internal.ExecutionStack.Internal as ExecStack
    18 18 
     import qualified GHC.Internal.Stack.CloneStack as CloneStack
    19 
    -import qualified GHC.Internal.Stack.Decode as CloneStack
    20 19 
     import qualified GHC.Internal.Stack.CCS as CCS
    21 20
    22 21 
     -- | How to collect a backtrace when an exception is thrown.
    ... ... @@ -144,7 +143,7 @@ displayBacktraces bts = concat
    144 143 
         displayExec = unlines . map (indent 2 . flip ExecStack.showLocation "") . fromMaybe [] . ExecStack.stackFrames
    145 144 
         -- The unsafePerformIO here is safe as 'StackSnapshot' makes sure neither the stack frames nor
    146 145 
         -- references closures can be garbage collected.
    147 
    -    displayIpe  = unlines . mapMaybe (fmap (indent 2) . CloneStack.prettyStackFrameWithIpe) . unsafePerformIO . CloneStack.decodeStackWithIpe
    146 
    +    displayIpe  = unlines . map (indent 2 . CloneStack.prettyStackEntry) . unsafePerformIO . CloneStack.decode
    148 147 
         displayHsc  = unlines . map (indent 2 . prettyCallSite) . HCS.getCallStack
    149 148 
           where prettyCallSite (f, loc) = f ++ ", called at " ++ HCS.prettySrcLoc loc
    150 149

  • libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
    ... ... @@ -15,20 +15,34 @@
    15 15 
     -- @since base-4.17.0.0
    16 16 
     module GHC.Internal.Stack.CloneStack (
    17 17 
       StackSnapshot(..),
    18 
    +  StackEntry(..),
    18 19 
       cloneMyStack,
    19 20 
       cloneThreadStack,
    21 
    +  decode,
    22 
    +  prettyStackEntry
    20 23 
       ) where
    21 24
    22 25 
     import GHC.Internal.MVar
    26 
    +import GHC.Internal.Data.Maybe (catMaybes)
    23 27 
     import GHC.Internal.Base
    28 
    +import GHC.Internal.Foreign.Storable
    24 29 
     import GHC.Internal.Conc.Sync
    30 
    +import GHC.Internal.IO (unsafeInterleaveIO)
    31 
    +import GHC.Internal.InfoProv.Types (InfoProv (..), ipLoc, lookupIPE, StgInfoTable)
    32 
    +import GHC.Internal.Num
    33 
    +import GHC.Internal.Real (div)
    25 34 
     import GHC.Internal.Stable
    35 
    +import GHC.Internal.Text.Show
    36 
    +import GHC.Internal.Ptr
    37 
    +import GHC.Internal.ClosureTypes
    26 38
    27 39 
     -- | A frozen snapshot of the state of an execution stack.
    28 40 
     --
    29 41 
     -- @since base-4.17.0.0
    30 42 
     data StackSnapshot = StackSnapshot !StackSnapshot#
    31 43
    44 
    +foreign import prim "stg_decodeStackzh" decodeStack# :: StackSnapshot# -> State# RealWorld -> (# State# RealWorld, ByteArray# #)
    45 
    +
    32 46 
     foreign import prim "stg_cloneMyStackzh" cloneMyStack# :: State# RealWorld -> (# State# RealWorld, StackSnapshot# #)
    33 47
    34 48 
     foreign import prim "stg_sendCloneStackMessagezh" sendCloneStackMessage# :: ThreadId# -> StablePtr# PrimMVar -> State# RealWorld -> (# State# RealWorld, (# #) #)
    ... ... @@ -191,3 +205,64 @@ cloneThreadStack (ThreadId tid#) = do
    191 205 
       IO $ \s -> case sendCloneStackMessage# tid# ptr s of (# s', (# #) #) -> (# s', () #)
    192 206 
       freeStablePtr boxedPtr
    193 207 
       takeMVar resultVar
    208 
    +
    209 
    +-- | Representation for the source location where a return frame was pushed on the stack.
    210 
    +-- This happens every time when a @case ... of@ scrutinee is evaluated.
    211 
    +data StackEntry = StackEntry
    212 
    +  { functionName :: String,
    213 
    +    moduleName :: String,
    214 
    +    srcLoc :: String,
    215 
    +    closureType :: ClosureType
    216 
    +  }
    217 
    +  deriving (Show, Eq)
    218 
    +
    219 
    +-- | Decode a 'StackSnapshot' to a stacktrace (a list of 'StackEntry').
    220 
    +-- The stack trace is created from return frames with according 'InfoProvEnt'
    221 
    +-- entries. To generate them, use the GHC flag @-finfo-table-map@. If there are
    222 
    +-- no 'InfoProvEnt' entries, an empty list is returned.
    223 
    +--
    224 
    +-- Please note:
    225 
    +--
    226 
    +--   * To gather 'StackEntry' from libraries, these have to be
    227 
    +--     compiled with @-finfo-table-map@, too.
    228 
    +--   * Due to optimizations by GHC (e.g. inlining) the stacktrace may change
    229 
    +--     with different GHC parameters and versions.
    230 
    +--   * The stack trace is empty (by design) if there are no return frames on
    231 
    +--     the stack. (These are pushed every time when a @case ... of@ scrutinee
    232 
    +--     is evaluated.)
    233 
    +--
    234 
    +-- @since base-4.17.0.0
    235 
    +decode :: StackSnapshot -> IO [StackEntry]
    236 
    +decode stackSnapshot = catMaybes `fmap` getDecodedStackArray stackSnapshot
    237 
    +
    238 
    +toStackEntry :: InfoProv -> StackEntry
    239 
    +toStackEntry infoProv =
    240 
    +  StackEntry
    241 
    +  { functionName = ipLabel infoProv,
    242 
    +    moduleName = ipMod infoProv,
    243 
    +    srcLoc = ipLoc infoProv,
    244 
    +    closureType = ipDesc infoProv
    245 
    +  }
    246 
    +
    247 
    +getDecodedStackArray :: StackSnapshot -> IO [Maybe StackEntry]
    248 
    +getDecodedStackArray (StackSnapshot s) =
    249 
    +  IO $ \s0 -> case decodeStack# s s0 of
    250 
    +    (# s1, arr #) ->
    251 
    +      let n = I# (sizeofByteArray# arr) `div` wordSize - 1
    252 
    +       in unIO (go arr n) s1
    253 
    +  where
    254 
    +    go :: ByteArray# -> Int -> IO [Maybe StackEntry]
    255 
    +    go _stack (-1) = return []
    256 
    +    go stack i = do
    257 
    +      infoProv <- lookupIPE (stackEntryAt stack i)
    258 
    +      rest <- unsafeInterleaveIO $ go stack (i-1)
    259 
    +      return ((toStackEntry `fmap` infoProv) : rest)
    260 
    +
    261 
    +    stackEntryAt :: ByteArray# -> Int -> Ptr StgInfoTable
    262 
    +    stackEntryAt stack (I# i) = Ptr (indexAddrArray# stack i)
    263 
    +
    264 
    +    wordSize = sizeOf (nullPtr :: Ptr ())
    265 
    +
    266 
    +prettyStackEntry :: StackEntry -> String
    267 
    +prettyStackEntry (StackEntry {moduleName=mod_nm, functionName=fun_nm, srcLoc=loc}) =
    268 
    +    "  " ++ mod_nm ++ "." ++ fun_nm ++ " (" ++ loc ++ ")"

  • libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
    ... ... @@ -14,17 +14,7 @@
    14 14 
     {-# LANGUAGE UnliftedFFITypes #-}
    15 15
    16 16 
     module GHC.Internal.Stack.Decode (
    17 
    -  -- * High-level stack decoders
    18 
    -  decode,
    19 17 
       decodeStack,
    20 
    -  decodeStackWithIpe,
    21 
    -  -- * Stack decoder helpers
    22 
    -  decodeStackWithFrameUnpack,
    23 
    -  -- * StackEntry
    24 
    -  StackEntry(..),
    25 
    -  -- * Pretty printing
    26 
    -  prettyStackEntry,
    27 
    -  prettyStackFrameWithIpe,
    28 18 
       )
    29 19 
     where
    30 20
    ... ... @@ -34,10 +24,7 @@ import GHC.Internal.Real
    34 24 
     import GHC.Internal.Word
    35 25 
     import GHC.Internal.Num
    36 26 
     import GHC.Internal.Data.Bits
    37 
    -import GHC.Internal.Data.Functor
    38 
    -import GHC.Internal.Data.Maybe (catMaybes)
    39 27 
     import GHC.Internal.Data.List
    40 
    -import GHC.Internal.Data.Tuple
    41 28 
     import GHC.Internal.Foreign.Ptr
    42 29 
     import GHC.Internal.Foreign.Storable
    43 30 
     import GHC.Internal.Exts
    ... ... @@ -58,7 +45,6 @@ import GHC.Internal.Heap.InfoTable
    58 45 
     import GHC.Internal.Stack.Annotation
    59 46 
     import GHC.Internal.Stack.Constants
    60 47 
     import GHC.Internal.Stack.CloneStack
    61 
    -import GHC.Internal.InfoProv.Types (InfoProv (..), ipLoc, lookupIPE)
    62 48
    63 49 
     {- Note [Decoding the stack]
    64 50 
        ~~~~~~~~~~~~~~~~~~~~~~~~~
    ... ... @@ -170,17 +156,14 @@ foreign import prim "getSmallBitmapzh" getSmallBitmap# :: SmallBitmapGetter
    170 156
    171 157 
     foreign import prim "getRetFunSmallBitmapzh" getRetFunSmallBitmap# :: SmallBitmapGetter
    172 158
    173 
    -foreign import prim "getInfoTableAddrszh" getInfoTableAddrs# :: StackSnapshot# -> Word# -> (# Addr#, Addr# #)
    159 
    +foreign import prim "getInfoTableAddrzh" getInfoTableAddr# :: StackSnapshot# -> Word# -> Addr#
    174 160
    175 161 
     foreign import prim "getStackInfoTableAddrzh" getStackInfoTableAddr# :: StackSnapshot# -> Addr#
    176 162
    177 
    --- | Get the 'StgInfoTable' of the stack frame.
    178 
    --- Additionally, provides 'InfoProv' for the 'StgInfoTable' if there is any.
    179 
    -getInfoTableOnStack :: StackSnapshot# -> WordOffset -> IO (StgInfoTable, Maybe InfoProv)
    163 
    +getInfoTableOnStack :: StackSnapshot# -> WordOffset -> IO StgInfoTable
    180 164 
     getInfoTableOnStack stackSnapshot# index =
    181 
    -  let !(# itbl_struct#, itbl_ptr_ipe_key# #) = getInfoTableAddrs# stackSnapshot# (wordOffsetToWord# index)
    182 
    -   in
    183 
    -    (,) <$> peekItbl (Ptr itbl_struct#) <*> lookupIPE (Ptr itbl_ptr_ipe_key#)
    165 
    +  let infoTablePtr = Ptr (getInfoTableAddr# stackSnapshot# (wordOffsetToWord# index))
    166 
    +   in peekItbl infoTablePtr
    184 167
    185 168 
     getInfoTableForStack :: StackSnapshot# -> IO StgInfoTable
    186 169 
     getInfoTableForStack stackSnapshot# =
    ... ... @@ -299,66 +282,18 @@ decodeSmallBitmap getterFun# stackSnapshot# index relativePayloadOffset =
    299 282 
           (bitmapWordPointerness size bitmap)
    300 283
    301 284 
     unpackStackFrame :: StackFrameLocation -> IO StackFrame
    302 
    -unpackStackFrame stackFrameLoc = do
    303 
    -  unpackStackFrameTo stackFrameLoc
    304 
    -    (\ info _ nextChunk -> do
    305 
    -      stackClosure <- decodeStack nextChunk
    306 
    -      pure $
    307 
    -        UnderflowFrame
    308 
    -          { info_tbl = info,
    309 
    -            nextChunk = stackClosure
    310 
    -          }
    311 
    -    )
    312 
    -    (\ frame _ -> pure frame)
    313 
    -
    314 
    -unpackStackFrameWithIpe :: StackFrameLocation -> IO [(StackFrame, Maybe InfoProv)]
    315 
    -unpackStackFrameWithIpe stackFrameLoc = do
    316 
    -  unpackStackFrameTo stackFrameLoc
    317 
    -    (\ info mIpe nextChunk@(StackSnapshot stack#) -> do
    318 
    -      framesWithIpe <- decodeStackWithIpe nextChunk
    319 
    -      pure
    320 
    -        [ ( UnderflowFrame
    321 
    -            { info_tbl = info,
    322 
    -              nextChunk =
    323 
    -                GenStgStackClosure
    324 
    -                  { ssc_info = info,
    325 
    -                    ssc_stack_size = getStackFields stack#,
    326 
    -                    ssc_stack = map fst framesWithIpe
    327 
    -                  }
    328 
    -            }
    329 
    -          , mIpe
    330 
    -          )
    331 
    -        ]
    332 
    -    )
    333 
    -    (\ frame mIpe -> pure [(frame, mIpe)])
    334 
    -
    335 
    -unpackStackFrameTo ::
    336 
    -  forall a .
    337 
    -  StackFrameLocation ->
    338 
    -  -- ^ Decode the given 'StackFrame'.
    339 
    -  (StgInfoTable -> Maybe InfoProv -> StackSnapshot -> IO a) ->
    340 
    -  -- ^ How to handle 'UNDERFLOW_FRAME's.
    341 
    -  (StackFrame -> Maybe InfoProv -> IO a) ->
    342 
    -  -- ^ How to handle all other 'StackFrame' values.
    343 
    -  IO a
    344 
    -unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame finaliseStackFrame = do
    345 
    -  (info, m_info_prov) <- getInfoTableOnStack stackSnapshot# index
    285 
    +unpackStackFrame (StackSnapshot stackSnapshot#, index) = do
    286 
    +  info <- getInfoTableOnStack stackSnapshot# index
    346 287 
       unpackStackFrame' info
    347 
    -    (unpackUnderflowFrame info m_info_prov)
    348 
    -    (`finaliseStackFrame` m_info_prov)
    349 288 
       where
    350 
    -    unpackStackFrame' ::
    351 
    -      StgInfoTable ->
    352 
    -      (StackSnapshot -> IO a) ->
    353 
    -      (StackFrame -> IO a) ->
    354 
    -      IO a
    355 
    -    unpackStackFrame' info mkUnderflowResult mkStackFrameResult =
    289 
    +    unpackStackFrame' :: StgInfoTable -> IO StackFrame
    290 
    +    unpackStackFrame' info =
    356 291 
           case tipe info of
    357 292 
             RET_BCO -> do
    358 293 
               let bco' = getClosureBox stackSnapshot# (index + offsetStgClosurePayload)
    359 294 
               -- The arguments begin directly after the payload's one element
    360 295 
               bcoArgs' <- decodeLargeBitmap getBCOLargeBitmap# stackSnapshot# index (offsetStgClosurePayload + 1)
    361 
    -          mkStackFrameResult
    296 
    +          pure
    362 297 
                 RetBCO
    363 298 
                   { info_tbl = info,
    364 299 
                     bco = bco',
    ... ... @@ -367,14 +302,14 @@ unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame fi
    367 302 
             RET_SMALL ->
    368 303 
               let payload' = decodeSmallBitmap getSmallBitmap# stackSnapshot# index offsetStgClosurePayload
    369 304 
               in
    370 
    -            mkStackFrameResult $
    305 
    +            pure $
    371 306 
                   RetSmall
    372 307 
                     { info_tbl = info,
    373 308 
                       stack_payload = payload'
    374 309 
                     }
    375 310 
             RET_BIG -> do
    376 311 
               payload' <- decodeLargeBitmap getLargeBitmap# stackSnapshot# index offsetStgClosurePayload
    377 
    -          mkStackFrameResult $
    312 
    +          pure $
    378 313 
                 RetBig
    379 314 
                   { info_tbl = info,
    380 315 
                     stack_payload = payload'
    ... ... @@ -386,7 +321,7 @@ unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame fi
    386 321 
                 if isArgGenBigRetFunType stackSnapshot# index == True
    387 322 
                   then decodeLargeBitmap getRetFunLargeBitmap# stackSnapshot# index offsetStgRetFunFramePayload
    388 323 
                   else pure $ decodeSmallBitmap getRetFunSmallBitmap# stackSnapshot# index offsetStgRetFunFramePayload
    389 
    -          mkStackFrameResult $
    324 
    +          pure $
    390 325 
                 RetFun
    391 326 
                   { info_tbl = info,
    392 327 
                     retFunSize = retFunSize',
    ... ... @@ -396,26 +331,31 @@ unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame fi
    396 331 
             UPDATE_FRAME ->
    397 332 
               let updatee' = getClosureBox stackSnapshot# (index + offsetStgUpdateFrameUpdatee)
    398 333 
               in
    399 
    -            mkStackFrameResult $
    334 
    +            pure $
    400 335 
                   UpdateFrame
    401 336 
                     { info_tbl = info,
    402 337 
                       updatee = updatee'
    403 338 
                     }
    404 339 
             CATCH_FRAME -> do
    405 340 
               let handler' = getClosureBox stackSnapshot# (index + offsetStgCatchFrameHandler)
    406 
    -          mkStackFrameResult $
    341 
    +          pure $
    407 342 
                 CatchFrame
    408 343 
                   { info_tbl = info,
    409 344 
                     handler = handler'
    410 345 
                   }
    411 346 
             UNDERFLOW_FRAME -> do
    412 347 
               let nextChunk' = getUnderflowFrameNextChunk stackSnapshot# index
    413 
    -          mkUnderflowResult nextChunk'
    414 
    -        STOP_FRAME -> mkStackFrameResult $ StopFrame {info_tbl = info}
    348 
    +          stackClosure <- decodeStack nextChunk'
    349 
    +          pure $
    350 
    +            UnderflowFrame
    351 
    +              { info_tbl = info,
    352 
    +                nextChunk = stackClosure
    353 
    +              }
    354 
    +        STOP_FRAME -> pure $ StopFrame {info_tbl = info}
    415 355 
             ATOMICALLY_FRAME -> do
    416 356 
               let atomicallyFrameCode' = getClosureBox stackSnapshot# (index + offsetStgAtomicallyFrameCode)
    417 357 
                   result' = getClosureBox stackSnapshot# (index + offsetStgAtomicallyFrameResult)
    418 
    -          mkStackFrameResult $
    358 
    +          pure $
    419 359 
                 AtomicallyFrame
    420 360 
                   { info_tbl = info,
    421 361 
                     atomicallyFrameCode = atomicallyFrameCode',
    ... ... @@ -426,7 +366,7 @@ unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame fi
    426 366 
                   first_code' = getClosureBox stackSnapshot# (index + offsetStgCatchRetryFrameRunningFirstCode)
    427 367 
                   alt_code' = getClosureBox stackSnapshot# (index + offsetStgCatchRetryFrameAltCode)
    428 368 
               in
    429 
    -            mkStackFrameResult $
    369 
    +            pure $
    430 370 
                   CatchRetryFrame
    431 371 
                     { info_tbl = info,
    432 372 
                       running_alt_code = running_alt_code',
    ... ... @@ -437,7 +377,7 @@ unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame fi
    437 377 
               let catchFrameCode' = getClosureBox stackSnapshot# (index + offsetStgCatchSTMFrameCode)
    438 378 
                   handler' = getClosureBox stackSnapshot# (index + offsetStgCatchSTMFrameHandler)
    439 379 
               in
    440 
    -            mkStackFrameResult $
    380 
    +            pure $
    441 381 
                   CatchStmFrame
    442 382 
                     { info_tbl = info,
    443 383 
                       catchFrameCode = catchFrameCode',
    ... ... @@ -446,7 +386,7 @@ unpackStackFrameTo (StackSnapshot stackSnapshot#, index) unpackUnderflowFrame fi
    446 386 
             ANN_FRAME ->
    447 387 
               let annotation = getClosureBox stackSnapshot# (index + offsetStgAnnFrameAnn)
    448 388 
                in
    449 
    -             mkStackFrameResult $
    389 
    +             pure $
    450 390 
                    AnnFrame
    451 391 
                     { info_tbl = info,
    452 392 
                       annotation = annotation
    ... ... @@ -464,54 +404,6 @@ intToWord# i = int2Word# (toInt# i)
    464 404 
     wordOffsetToWord# :: WordOffset -> Word#
    465 405 
     wordOffsetToWord# wo = intToWord# (fromIntegral wo)
    466 406
    467 
    --- ----------------------------------------------------------------------------
    468 
    --- Simplified source location representation of provenance information
    469 
    --- ----------------------------------------------------------------------------
    470 
    -
    471 
    --- | Representation for the source location where a return frame was pushed on the stack.
    472 
    --- This happens every time when a @case ... of@ scrutinee is evaluated.
    473 
    -data StackEntry = StackEntry
    474 
    -  { functionName :: String,
    475 
    -    moduleName :: String,
    476 
    -    srcLoc :: String,
    477 
    -    closureType :: ClosureType
    478 
    -  }
    479 
    -  deriving (Show, Eq)
    480 
    -
    481 
    -toStackEntry :: InfoProv -> StackEntry
    482 
    -toStackEntry infoProv =
    483 
    -  StackEntry
    484 
    -  { functionName = ipLabel infoProv,
    485 
    -    moduleName = ipMod infoProv,
    486 
    -    srcLoc = ipLoc infoProv,
    487 
    -    closureType = ipDesc infoProv
    488 
    -  }
    489 
    -
    490 
    --- ----------------------------------------------------------------------------
    491 
    --- Stack decoders
    492 
    --- ----------------------------------------------------------------------------
    493 
    -
    494 
    --- | Decode a 'StackSnapshot' to a stacktrace (a list of 'StackEntry').
    495 
    --- The stack trace is created from return frames with according 'InfoProvEnt'
    496 
    --- entries. To generate them, use the GHC flag @-finfo-table-map@. If there are
    497 
    --- no 'InfoProvEnt' entries, an empty list is returned.
    498 
    ---
    499 
    --- Please note:
    500 
    ---
    501 
    ---   * To gather 'StackEntry' from libraries, these have to be
    502 
    ---     compiled with @-finfo-table-map@, too.
    503 
    ---   * Due to optimizations by GHC (e.g. inlining) the stacktrace may change
    504 
    ---     with different GHC parameters and versions.
    505 
    ---   * The stack trace is empty (by design) if there are no return frames on
    506 
    ---     the stack. (These are pushed every time when a @case ... of@ scrutinee
    507 
    ---     is evaluated.)
    508 
    ---
    509 
    --- @since base-4.17.0.0
    510 
    -decode :: StackSnapshot -> IO [StackEntry]
    511 
    -decode stackSnapshot =
    512 
    -  (map toStackEntry . catMaybes . map snd . reverse) <$> decodeStackWithIpe stackSnapshot
    513 
    -
    514 
    -
    515 407 
     -- | Location of a stackframe on the stack
    516 408 
     --
    517 409 
     -- It's defined by the `StackSnapshot` (@StgStack@) and the offset to the bottom
    ... ... @@ -524,31 +416,19 @@ type StackFrameLocation = (StackSnapshot, WordOffset)
    524 416 
     --
    525 417 
     -- See /Note [Decoding the stack]/.
    526 418 
     decodeStack :: StackSnapshot -> IO StgStackClosure
    527 
    -decodeStack snapshot@(StackSnapshot stack#) = do
    528 
    -  (stackInfo, ssc_stack) <- decodeStackWithFrameUnpack unpackStackFrame snapshot
    529 
    -  pure
    530 
    -    GenStgStackClosure
    531 
    -      { ssc_info = stackInfo,
    532 
    -        ssc_stack_size = getStackFields stack#,
    533 
    -        ssc_stack = ssc_stack
    534 
    -      }
    535 
    -
    536 
    -decodeStackWithIpe :: StackSnapshot -> IO [(StackFrame, Maybe InfoProv)]
    537 
    -decodeStackWithIpe snapshot =
    538 
    -  concat . snd <$> decodeStackWithFrameUnpack unpackStackFrameWithIpe snapshot
    539 
    -
    540 
    --- ----------------------------------------------------------------------------
    541 
    --- Write your own stack decoder!
    542 
    --- ----------------------------------------------------------------------------
    543 
    -
    544 
    -decodeStackWithFrameUnpack :: (StackFrameLocation -> IO a) -> StackSnapshot -> IO (StgInfoTable, [a])
    545 
    -decodeStackWithFrameUnpack unpackFrame (StackSnapshot stack#) = do
    419 
    +decodeStack (StackSnapshot stack#) = do
    546 420 
       info <- getInfoTableForStack stack#
    547 421 
       case tipe info of
    548 422 
         STACK -> do
    549 
    -      let sfls = stackFrameLocations stack#
    550 
    -      stack' <- mapM unpackFrame sfls
    551 
    -      pure (info, stack')
    423 
    +      let stack_size' = getStackFields stack#
    424 
    +          sfls = stackFrameLocations stack#
    425 
    +      stack' <- mapM unpackStackFrame sfls
    426 
    +      pure $
    427 
    +        GenStgStackClosure
    428 
    +          { ssc_info = info,
    429 
    +            ssc_stack_size = stack_size',
    430 
    +            ssc_stack = stack'
    431 
    +          }
    552 432 
         _ -> error $ "Expected STACK closure, got " ++ show info
    553 433 
       where
    554 434 
         stackFrameLocations :: StackSnapshot# -> [StackFrameLocation]
    ... ... @@ -559,21 +439,3 @@ decodeStackWithFrameUnpack unpackFrame (StackSnapshot stack#) = do
    559 439 
             go :: Maybe StackFrameLocation -> [StackFrameLocation]
    560 440 
             go Nothing = []
    561 441 
             go (Just r) = r : go (advanceStackFrameLocation r)
    562 
    -
    563 
    --- ----------------------------------------------------------------------------
    564 
    --- Pretty printing functions for stack entries, stack frames and provenance info
    565 
    --- ----------------------------------------------------------------------------
    566 
    -
    567 
    -prettyStackFrameWithIpe :: (StackFrame, Maybe InfoProv) -> Maybe String
    568 
    -prettyStackFrameWithIpe (frame, mipe) =
    569 
    -  case frame of
    570 
    -    AnnFrame {annotation = Box someStackAnno } ->
    571 
    -      case unsafeCoerce someStackAnno of
    572 
    -        SomeStackAnnotation ann ->
    573 
    -          Just $ displayStackAnnotation ann
    574 
    -    _ ->
    575 
    -      (prettyStackEntry . toStackEntry) <$> mipe
    576 
    -
    577 
    -prettyStackEntry :: StackEntry -> String
    578 
    -prettyStackEntry (StackEntry {moduleName=mod_nm, functionName=fun_nm, srcLoc=loc}) =
    579 
    -  mod_nm ++ "." ++ fun_nm ++ " (" ++ loc ++ ")"

  • libraries/ghc-internal/tests/backtraces/T26507.hs
    1 
    +import GHC.Internal.Control.Exception
    2 
    +import GHC.Internal.Exception.Backtrace
    3 
    +
    4 
    +main :: IO ()
    5 
    +main = do
    6 
    +  setBacktraceMechanismState IPEBacktrace True
    7 
    +  throwIO $ ErrorCall "Throw error"

  • libraries/ghc-internal/tests/backtraces/T26507.stderr
    1 
    +T26507: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
    2 
    +
    3 
    +Throw error
    4 
    +
    5 
    +IPE backtrace:
    6 
    +HasCallStack backtrace:
    7 
    +  throwIO, called at T26507.hs:7:3 in main:Main
    8 
    +

  • libraries/ghc-internal/tests/backtraces/all.T
    1 1 
     test('T14532a', [], compile_and_run, [''])
    2 2 
     test('T14532b', [], compile_and_run, [''])
    3 
    +test('T26507', [extra_ways(['prof']), when(js_arch(), skip), exit_code(1)], compile_and_run, [''])
    4 
    +

  • rts/CloneStack.c
    ... ... @@ -26,6 +26,11 @@
    26 26 
     #include <string.h>
    27 27
    28 28
    29 
    +static StgWord getStackFrameCount(StgStack* stack);
    30 
    +static StgWord getStackChunkClosureCount(StgStack* stack);
    31 
    +static StgArrBytes* allocateByteArray(Capability *cap, StgWord bytes);
    32 
    +static void copyPtrsToArray(StgArrBytes* arr, StgStack* stack);
    33 
    +
    29 34 
     static StgStack* cloneStackChunk(Capability* capability, const StgStack* stack)
    30 35 
     {
    31 36 
       StgWord spOffset = stack->sp - stack->stack;
    ... ... @@ -107,3 +112,94 @@ void sendCloneStackMessage(StgTSO *tso STG_UNUSED, HsStablePtr mvar STG_UNUSED)
    107 112 
     }
    108 113
    109 114 
     #endif // end !defined(THREADED_RTS)
    115 
    +
    116 
    +// Creates a MutableArray# (Haskell representation) that contains a
    117 
    +// InfoProvEnt* for every stack frame on the given stack. Thus, the size of the
    118 
    +// array is the count of stack frames.
    119 
    +// Each InfoProvEnt* is looked up by lookupIPE(). If there's no IPE for a stack
    120 
    +// frame it's represented by null.
    121 
    +StgArrBytes* decodeClonedStack(Capability *cap, StgStack* stack) {
    122 
    +  StgWord closureCount = getStackFrameCount(stack);
    123 
    +
    124 
    +  StgArrBytes* array = allocateByteArray(cap, sizeof(StgInfoTable*) * closureCount);
    125 
    +
    126 
    +  copyPtrsToArray(array, stack);
    127 
    +
    128 
    +  return array;
    129 
    +}
    130 
    +
    131 
    +// Count the stack frames that are on the given stack.
    132 
    +// This is the sum of all stack frames in all stack chunks of this stack.
    133 
    +StgWord getStackFrameCount(StgStack* stack) {
    134 
    +  StgWord closureCount = 0;
    135 
    +  StgStack *last_stack = stack;
    136 
    +  while (true) {
    137 
    +    closureCount += getStackChunkClosureCount(last_stack);
    138 
    +
    139 
    +    // check whether the stack ends in an underflow frame
    140 
    +    StgUnderflowFrame *frame = (StgUnderflowFrame *) (last_stack->stack
    141 
    +      + last_stack->stack_size - sizeofW(StgUnderflowFrame));
    142 
    +    if (frame->info == &stg_stack_underflow_frame_d_info
    143 
    +      ||frame->info == &stg_stack_underflow_frame_v16_info
    144 
    +      ||frame->info == &stg_stack_underflow_frame_v32_info
    145 
    +      ||frame->info == &stg_stack_underflow_frame_v64_info) {
    146 
    +      last_stack = frame->next_chunk;
    147 
    +    } else {
    148 
    +      break;
    149 
    +    }
    150 
    +  }
    151 
    +  return closureCount;
    152 
    +}
    153 
    +
    154 
    +StgWord getStackChunkClosureCount(StgStack* stack) {
    155 
    +    StgWord closureCount = 0;
    156 
    +    StgPtr sp = stack->sp;
    157 
    +    StgPtr spBottom = stack->stack + stack->stack_size;
    158 
    +    for (; sp < spBottom; sp += stack_frame_sizeW((StgClosure *)sp)) {
    159 
    +      closureCount++;
    160 
    +    }
    161 
    +
    162 
    +    return closureCount;
    163 
    +}
    164 
    +
    165 
    +// Allocate and initialize memory for a ByteArray# (Haskell representation).
    166 
    +StgArrBytes* allocateByteArray(Capability *cap, StgWord bytes) {
    167 
    +  // Idea stolen from PrimOps.cmm:stg_newArrayzh()
    168 
    +  StgWord words = sizeofW(StgArrBytes) + bytes;
    169 
    +
    170 
    +  StgArrBytes* array = (StgArrBytes*) allocate(cap, words);
    171 
    +
    172 
    +  SET_HDR(array, &stg_ARR_WORDS_info, CCS_SYSTEM);
    173 
    +  array->bytes  = bytes;
    174 
    +  return array;
    175 
    +}
    176 
    +
    177 
    +static void copyPtrsToArray(StgArrBytes* arr, StgStack* stack) {
    178 
    +  StgWord index = 0;
    179 
    +  StgStack *last_stack = stack;
    180 
    +  const StgInfoTable **result = (const StgInfoTable **) arr->payload;
    181 
    +  while (true) {
    182 
    +    StgPtr sp = last_stack->sp;
    183 
    +    StgPtr spBottom = last_stack->stack + last_stack->stack_size;
    184 
    +    for (; sp < spBottom; sp += stack_frame_sizeW((StgClosure *)sp)) {
    185 
    +      const StgInfoTable* infoTable = ((StgClosure *)sp)->header.info;
    186 
    +      result[index] = infoTable;
    187 
    +      index++;
    188 
    +    }
    189 
    +
    190 
    +    // Ensure that we didn't overflow the result array
    191 
    +    ASSERT(index-1 < arr->bytes / sizeof(StgInfoTable*));
    192 
    +
    193 
    +    // check whether the stack ends in an underflow frame
    194 
    +    StgUnderflowFrame *frame = (StgUnderflowFrame *) (last_stack->stack
    195 
    +      + last_stack->stack_size - sizeofW(StgUnderflowFrame));
    196 
    +    if (frame->info == &stg_stack_underflow_frame_d_info
    197 
    +      ||frame->info == &stg_stack_underflow_frame_v16_info
    198 
    +      ||frame->info == &stg_stack_underflow_frame_v32_info
    199 
    +      ||frame->info == &stg_stack_underflow_frame_v64_info) {
    200 
    +      last_stack = frame->next_chunk;
    201 
    +    } else {
    202 
    +      break;
    203 
    +    }
    204 
    +  }
    205 
    +}

  • rts/CloneStack.h
    ... ... @@ -15,6 +15,8 @@ StgStack* cloneStack(Capability* capability, const StgStack* stack);
    15 15
    16 16 
     void sendCloneStackMessage(StgTSO *tso, HsStablePtr mvar);
    17 17
    18 
    +StgArrBytes* decodeClonedStack(Capability *cap, StgStack* stack);
    19 
    +
    18 20 
     #include "BeginPrivate.h"
    19 21
    20 22 
     #if defined(THREADED_RTS)

  • rts/RtsSymbols.c
    ... ... @@ -943,6 +943,7 @@ extern char **environ;
    943 943 
           SymI_HasProto(lookupIPE)                                          \
    944 944 
           SymI_HasProto(sendCloneStackMessage)                              \
    945 945 
           SymI_HasProto(cloneStack)                                         \
    946 
    +      SymI_HasProto(decodeClonedStack)                                  \
    946 947 
           SymI_HasProto(stg_newPromptTagzh)                                 \
    947 948 
           SymI_HasProto(stg_promptzh)                                       \
    948 949 
           SymI_HasProto(stg_control0zh)                                     \

  • testsuite/tests/interface-stability/base-exports.stdout
    ... ... @@ -11682,7 +11682,7 @@ instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.BigNat.BigNat -- Defined in
    11682 11682 
     instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.Natural.Natural -- Defined in ‘GHC.Internal.Bignum.Natural’
    11683 11683 
     instance GHC.Internal.Classes.Eq GHC.RTS.Flags.IoManagerFlag -- Defined in ‘GHC.RTS.Flags’
    11684 11684 
     instance forall a. GHC.Internal.Classes.Eq (GHC.Internal.StableName.StableName a) -- Defined in ‘GHC.Internal.StableName’
    11685 
    -instance GHC.Internal.Classes.Eq GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    11685 
    +instance GHC.Internal.Classes.Eq GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    11686 11686 
     instance forall (n :: GHC.Internal.TypeNats.Nat). GHC.Internal.Classes.Eq (GHC.Internal.TypeNats.SNat n) -- Defined in ‘GHC.Internal.TypeNats’
    11687 11687 
     instance GHC.Internal.Classes.Eq GHC.Internal.TypeNats.SomeNat -- Defined in ‘GHC.Internal.TypeNats’
    11688 11688 
     instance forall (c :: GHC.Internal.Types.Char). GHC.Internal.Classes.Eq (GHC.Internal.TypeLits.SChar c) -- Defined in ‘GHC.Internal.TypeLits’
    ... ... @@ -13197,8 +13197,7 @@ instance GHC.Internal.Show.Show GHC.RTS.Flags.ProfFlags -- Defined in ‘GHC.RTS
    13197 13197 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.RTSFlags -- Defined in ‘GHC.RTS.Flags’
    13198 13198 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TickyFlags -- Defined in ‘GHC.RTS.Flags’
    13199 13199 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TraceFlags -- Defined in ‘GHC.RTS.Flags’
    13200 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.Pointerness -- Defined in ‘GHC.Internal.Stack.Decode’
    13201 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    13200 
    +instance GHC.Internal.Show.Show GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    13202 13201 
     instance GHC.Internal.Show.Show GHC.Internal.StaticPtr.StaticPtrInfo -- Defined in ‘GHC.Internal.StaticPtr’
    13203 13202 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.GCDetails -- Defined in ‘GHC.Stats’
    13204 13203 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.RTSStats -- Defined in ‘GHC.Stats’

  • testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs
    ... ... @@ -14717,7 +14717,7 @@ instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.BigNat.BigNat -- Defined in
    14717 14717 
     instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.Natural.Natural -- Defined in ‘GHC.Internal.Bignum.Natural’
    14718 14718 
     instance GHC.Internal.Classes.Eq GHC.RTS.Flags.IoManagerFlag -- Defined in ‘GHC.RTS.Flags’
    14719 14719 
     instance forall a. GHC.Internal.Classes.Eq (GHC.Internal.StableName.StableName a) -- Defined in ‘GHC.Internal.StableName’
    14720 
    -instance GHC.Internal.Classes.Eq GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    14720 
    +instance GHC.Internal.Classes.Eq GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    14721 14721 
     instance forall (n :: GHC.Internal.TypeNats.Nat). GHC.Internal.Classes.Eq (GHC.Internal.TypeNats.SNat n) -- Defined in ‘GHC.Internal.TypeNats’
    14722 14722 
     instance GHC.Internal.Classes.Eq GHC.Internal.TypeNats.SomeNat -- Defined in ‘GHC.Internal.TypeNats’
    14723 14723 
     instance forall (c :: GHC.Internal.Types.Char). GHC.Internal.Classes.Eq (GHC.Internal.TypeLits.SChar c) -- Defined in ‘GHC.Internal.TypeLits’
    ... ... @@ -16229,8 +16229,7 @@ instance GHC.Internal.Show.Show GHC.RTS.Flags.ProfFlags -- Defined in ‘GHC.RTS
    16229 16229 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.RTSFlags -- Defined in ‘GHC.RTS.Flags’
    16230 16230 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TickyFlags -- Defined in ‘GHC.RTS.Flags’
    16231 16231 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TraceFlags -- Defined in ‘GHC.RTS.Flags’
    16232 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.Pointerness -- Defined in ‘GHC.Internal.Stack.Decode’
    16233 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    16232 
    +instance GHC.Internal.Show.Show GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    16234 16233 
     instance GHC.Internal.Show.Show GHC.Internal.StaticPtr.StaticPtrInfo -- Defined in ‘GHC.Internal.StaticPtr’
    16235 16234 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.GCDetails -- Defined in ‘GHC.Stats’
    16236 16235 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.RTSStats -- Defined in ‘GHC.Stats’

  • testsuite/tests/interface-stability/base-exports.stdout-mingw32
    ... ... @@ -11938,7 +11938,7 @@ instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.BigNat.BigNat -- Defined in
    11938 11938 
     instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.Natural.Natural -- Defined in ‘GHC.Internal.Bignum.Natural’
    11939 11939 
     instance GHC.Internal.Classes.Eq GHC.RTS.Flags.IoManagerFlag -- Defined in ‘GHC.RTS.Flags’
    11940 11940 
     instance forall a. GHC.Internal.Classes.Eq (GHC.Internal.StableName.StableName a) -- Defined in ‘GHC.Internal.StableName’
    11941 
    -instance GHC.Internal.Classes.Eq GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    11941 
    +instance GHC.Internal.Classes.Eq GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    11942 11942 
     instance forall (n :: GHC.Internal.TypeNats.Nat). GHC.Internal.Classes.Eq (GHC.Internal.TypeNats.SNat n) -- Defined in ‘GHC.Internal.TypeNats’
    11943 11943 
     instance GHC.Internal.Classes.Eq GHC.Internal.TypeNats.SomeNat -- Defined in ‘GHC.Internal.TypeNats’
    11944 11944 
     instance forall (c :: GHC.Internal.Types.Char). GHC.Internal.Classes.Eq (GHC.Internal.TypeLits.SChar c) -- Defined in ‘GHC.Internal.TypeLits’
    ... ... @@ -13469,8 +13469,7 @@ instance GHC.Internal.Show.Show GHC.RTS.Flags.ProfFlags -- Defined in ‘GHC.RTS
    13469 13469 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.RTSFlags -- Defined in ‘GHC.RTS.Flags’
    13470 13470 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TickyFlags -- Defined in ‘GHC.RTS.Flags’
    13471 13471 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TraceFlags -- Defined in ‘GHC.RTS.Flags’
    13472 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.Pointerness -- Defined in ‘GHC.Internal.Stack.Decode’
    13473 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    13472 
    +instance GHC.Internal.Show.Show GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    13474 13473 
     instance GHC.Internal.Show.Show GHC.Internal.StaticPtr.StaticPtrInfo -- Defined in ‘GHC.Internal.StaticPtr’
    13475 13474 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.GCDetails -- Defined in ‘GHC.Stats’
    13476 13475 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.RTSStats -- Defined in ‘GHC.Stats’

  • testsuite/tests/interface-stability/base-exports.stdout-ws-32
    ... ... @@ -11682,7 +11682,7 @@ instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.BigNat.BigNat -- Defined in
    11682 11682 
     instance GHC.Internal.Classes.Eq GHC.Internal.Bignum.Natural.Natural -- Defined in ‘GHC.Internal.Bignum.Natural’
    11683 11683 
     instance GHC.Internal.Classes.Eq GHC.RTS.Flags.IoManagerFlag -- Defined in ‘GHC.RTS.Flags’
    11684 11684 
     instance forall a. GHC.Internal.Classes.Eq (GHC.Internal.StableName.StableName a) -- Defined in ‘GHC.Internal.StableName’
    11685 
    -instance GHC.Internal.Classes.Eq GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    11685 
    +instance GHC.Internal.Classes.Eq GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    11686 11686 
     instance forall (n :: GHC.Internal.TypeNats.Nat). GHC.Internal.Classes.Eq (GHC.Internal.TypeNats.SNat n) -- Defined in ‘GHC.Internal.TypeNats’
    11687 11687 
     instance GHC.Internal.Classes.Eq GHC.Internal.TypeNats.SomeNat -- Defined in ‘GHC.Internal.TypeNats’
    11688 11688 
     instance forall (c :: GHC.Internal.Types.Char). GHC.Internal.Classes.Eq (GHC.Internal.TypeLits.SChar c) -- Defined in ‘GHC.Internal.TypeLits’
    ... ... @@ -13197,8 +13197,7 @@ instance GHC.Internal.Show.Show GHC.RTS.Flags.ProfFlags -- Defined in ‘GHC.RTS
    13197 13197 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.RTSFlags -- Defined in ‘GHC.RTS.Flags’
    13198 13198 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TickyFlags -- Defined in ‘GHC.RTS.Flags’
    13199 13199 
     instance GHC.Internal.Show.Show GHC.RTS.Flags.TraceFlags -- Defined in ‘GHC.RTS.Flags’
    13200 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.Pointerness -- Defined in ‘GHC.Internal.Stack.Decode’
    13201 
    -instance GHC.Internal.Show.Show GHC.Internal.Stack.Decode.StackEntry -- Defined in ‘GHC.Internal.Stack.Decode’
    13200 
    +instance GHC.Internal.Show.Show GHC.Internal.Stack.CloneStack.StackEntry -- Defined in ‘GHC.Internal.Stack.CloneStack’
    13202 13201 
     instance GHC.Internal.Show.Show GHC.Internal.StaticPtr.StaticPtrInfo -- Defined in ‘GHC.Internal.StaticPtr’
    13203 13202 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.GCDetails -- Defined in ‘GHC.Stats’
    13204 13203 
     instance [safe] GHC.Internal.Show.Show GHC.Stats.RTSStats -- Defined in ‘GHC.Stats’

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