#11686: implicit call stacks should provide a way to get the calling function's name -------------------------------------+------------------------------------- Reporter: elaforge | Owner: Type: feature | Status: new request | Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- With implicit call stacks we can get the calling SrcPos and the called function's name, but not the caller function's name. E.g.: {{{#!hs {-# LANGUAGE ImplicitParams, ConstraintKinds #-} import qualified GHC.Stack as Stack caller :: IO () caller = callee 10 where callee :: (?stack :: Stack.CallStack) => Int -> IO () callee _n = mapM_ print (Stack.getCallStack ?stack) }}} Gives {{{ ("?stack",SrcLoc {srcLocPackage = "main", srcLocModule = "Main", srcLocFile = "T.hs", srcLocStartLine = 9, srcLocStartCol = 36, srcLocEndLine = 9, srcLocEndCol = 42}) ("callee",SrcLoc {srcLocPackage = "main", srcLocModule = "Main", srcLocFile = "T.hs", srcLocStartLine = 6, srcLocStartCol = 23, srcLocEndLine = 6, srcLocEndCol = 29}) }}} It would be nice to get the name "caller" as well. It's too bad getCallStack returns pairs instead of an abstract type like Frame. Perhaps a separate Stack.getFrames could do that while getCallStack continues to return pairs for compatibility. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11686 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler