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|
{-# LANGUAGE Trustworthy #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.Stack
-- Copyright : (c) The University of Glasgow 2011
-- License : see libraries/base/LICENSE
--
-- Maintainer : cvs-ghc@haskell.org
-- Stability : internal
-- Portability : non-portable (GHC Extensions)
--
-- Access to GHC's call-stack simulation
--
-- @since 4.5.0.0
-----------------------------------------------------------------------------
{-# LANGUAGE UnboxedTuples, MagicHash, NoImplicitPrelude #-}
module GHC.Stack (
-- * Call stacks
currentCallStack,
whoCreated,
errorWithStackTrace,
-- * Implicit parameter call stacks
SrcLoc(..), CallStack(..),
-- * Internals
CostCentreStack,
CostCentre,
getCurrentCCS,
getCCSOf,
ccsCC,
ccsParent,
ccLabel,
ccModule,
ccSrcSpan,
ccsToStrings,
renderStack
) where
import GHC.Stack.CCS
import GHC.IO
import GHC.Base
import GHC.List
import GHC.Exception
-- | Like the function 'error', but appends a stack trace to the error
-- message if one is available.
--
-- @since 4.7.0.0
{-# DEPRECATED errorWithStackTrace "'error' appends the call stack now" #-}
-- DEPRECATED in 8.0.1
errorWithStackTrace :: String -> a
errorWithStackTrace x = unsafeDupablePerformIO $ do
stack <- ccsToStrings =<< getCurrentCCS x
if null stack
then throwIO (ErrorCall x)
else throwIO (ErrorCallWithLocation x (renderStack stack))
|
