X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FErrUtils.lhs;h=ecad68951a6b0dd88fc6ebefdc0a2b5878169df6;hb=550421384b8364cdaf3135f7859c9f7d7ee1fff1;hp=d455ff0b41b6153d29b88208144457a3676be57d;hpb=6c381e873e222417d9a67aeec77b9555eca7b7a8;p=ghc-hetmet.git

diff --git a/ghc/compiler/main/ErrUtils.lhs b/ghc/compiler/main/ErrUtils.lhs
index d455ff0..ecad689 100644
--- a/ghc/compiler/main/ErrUtils.lhs
+++ b/ghc/compiler/main/ErrUtils.lhs
@@ -1,83 +1,167 @@
 %
-% (c) The AQUA Project, Glasgow University, 1994-1995
+% (c) The AQUA Project, Glasgow University, 1994-1998
 %
 \section[ErrsUtils]{Utilities for error reporting}
 
 \begin{code}
-#include "HsVersions.h"
-
 module ErrUtils (
+	Message, mkLocMessage, printError,
 
-	Error(..),
-	addErrLoc, addShortErrLocLine,
-	dontAddErrLoc, pprBagOfErrors,
-
-	TcError(..), TcWarning(..), Message(..),
-	mkTcErr, arityErr
+	ErrMsg, WarnMsg,
+	Messages, errorsFound, emptyMessages,
+	mkErrMsg, mkWarnMsg,
+	printErrorsAndWarnings, pprBagOfErrors, pprBagOfWarnings,
 
+	ghcExit,
+	doIfSet, doIfSet_dyn, 
+	dumpIfSet, dumpIfSet_core, dumpIfSet_dyn, dumpIfSet_dyn_or, mkDumpDoc,
+	showPass
     ) where
 
-import Ubiq{-uitous-}
+#include "HsVersions.h"
 
-import Bag		( bagToList )
-import PprStyle		( PprStyle(..) )
-import Pretty
-import SrcLoc		( mkUnknownSrcLoc, SrcLoc{-instance-} )
+import Bag		( Bag, bagToList, isEmptyBag, emptyBag )
+import SrcLoc		( SrcSpan )
+import Util		( sortLt )
+import Outputable
+import qualified Pretty
+import SrcLoc		( srcSpanStart )
+import CmdLineOpts	( DynFlags(..), DynFlag(..), dopt,
+			  opt_ErrorSpans )
+
+import List             ( replicate )
+import System		( ExitCode(..), exitWith )
+import IO		( hPutStr, stderr, stdout )
 \end{code}
 
+Basic error messages: just render a message with a source location.
+
 \begin{code}
-type Error   = PprStyle -> Pretty
-
-addErrLoc :: SrcLoc -> String -> Error -> Error
-addErrLoc locn title rest_of_err_msg sty
-  = ppHang (ppBesides [ppr PprForUser locn,
-		       if null title then ppNil else ppStr (": " ++ title),
-		       ppChar ':'])
-    	 4 (rest_of_err_msg sty)
-
-addShortErrLocLine :: SrcLoc -> Error -> Error
-addShortErrLocLine locn rest_of_err_msg sty
-  = ppHang (ppBeside (ppr PprForUser locn) (ppChar ':'))
-	 4 (rest_of_err_msg sty)
-
-dontAddErrLoc :: String -> Error -> Error
-dontAddErrLoc title rest_of_err_msg sty
-  = ppHang (ppBesides [ppStr title, ppChar ':'])
-    	 4 (rest_of_err_msg sty)
-
-pprBagOfErrors :: PprStyle -> Bag Error -> Pretty
-pprBagOfErrors sty bag_of_errors
-  = let  pretties = map ( \ e -> e sty ) (bagToList bag_of_errors)  in
-    ppAboves (map (\ p -> ppAbove ppSP p) pretties)
+type Message = SDoc
+
+mkLocMessage :: SrcSpan -> Message -> Message
+mkLocMessage locn msg
+  | opt_ErrorSpans = hang (ppr locn <> colon) 4 msg
+  | otherwise      = hang (ppr (srcSpanStart locn) <> colon) 4 msg
+  -- always print the location, even if it is unhelpful.  Error messages
+  -- are supposed to be in a standard format, and one without a location
+  -- would look strange.  Better to say explicitly "<no location info>".
+
+printError :: SrcSpan -> Message -> IO ()
+printError span msg = printErrs (mkLocMessage span msg $ defaultErrStyle)
 \end{code}
 
-TypeChecking Errors
-~~~~~~~~~~~~~~~~~~~
+Collecting up messages for later ordering and printing.
 
 \begin{code}
-type Message   = PprStyle -> Pretty
-type TcError   = Message
-type TcWarning = Message
+data ErrMsg = ErrMsg SrcSpan Pretty.Doc
+	-- The SrcSpan is used for sorting errors into line-number order
+	-- NB  Pretty.Doc not SDoc: we deal with the printing style (in ptic 
+	-- whether to qualify an External Name) at the error occurrence
+
+type WarnMsg = ErrMsg
+
+-- These two are used heavily by renamer/typechecker.
+--  Be refined about qualification, return an ErrMsg
+mkErrMsg :: SrcSpan -> PrintUnqualified -> Message -> ErrMsg
+mkErrMsg locn print_unqual msg
+  = ErrMsg locn (mkLocMessage locn msg $ mkErrStyle print_unqual)
+
+mkWarnMsg :: SrcSpan -> PrintUnqualified -> Message -> WarnMsg
+mkWarnMsg = mkErrMsg
+
+type Messages = (Bag WarnMsg, Bag ErrMsg)
+
+emptyMessages :: Messages
+emptyMessages = (emptyBag, emptyBag)
+
+errorsFound :: DynFlags -> Messages -> Bool
+-- The dyn-flags are used to see if the user has specified
+-- -Werorr, which says that warnings should be fatal
+errorsFound dflags (warns, errs) 
+  | dopt Opt_WarnIsError dflags = not (isEmptyBag errs) || not (isEmptyBag warns)
+  | otherwise  		        = not (isEmptyBag errs)
+
+printErrorsAndWarnings :: Messages -> IO ()
+	-- Don't print any warnings if there are errors
+printErrorsAndWarnings (warns, errs)
+  | no_errs && no_warns  = return ()
+  | no_errs		 = printErrs (pprBagOfWarnings warns)
+  | otherwise		 = printErrs (pprBagOfErrors   errs)
+  where
+    no_warns = isEmptyBag warns
+    no_errs  = isEmptyBag errs
+
+pprBagOfErrors :: Bag ErrMsg -> Pretty.Doc
+pprBagOfErrors bag_of_errors
+  = Pretty.vcat [Pretty.text "" Pretty.$$ e | ErrMsg _ e <- sorted_errs ]
+    where
+      bag_ls	  = bagToList bag_of_errors
+      sorted_errs = sortLt occ'ed_before bag_ls
+
+      occ'ed_before (ErrMsg l1 _) (ErrMsg l2 _) = LT == compare l1 l2
 
+pprBagOfWarnings :: Bag WarnMsg -> Pretty.Doc
+pprBagOfWarnings bag_of_warns = pprBagOfErrors bag_of_warns
+\end{code}
 
-mkTcErr :: SrcLoc 		-- Where
-	-> [Message] 		-- Context
-	-> Message 		-- What went wrong
-	-> TcError		-- The complete error report
+\begin{code}
+ghcExit :: Int -> IO ()
+ghcExit val
+  | val == 0  = exitWith ExitSuccess
+  | otherwise = do hPutStr stderr "\nCompilation had errors\n\n"
+	           exitWith (ExitFailure val)
+\end{code}
 
-mkTcErr locn ctxt msg sty
-  = ppHang (ppBesides [ppr PprForUser locn, ppStr ": ", msg sty])
-    	 4 (ppAboves [msg sty | msg <- ctxt])
+\begin{code}
+doIfSet :: Bool -> IO () -> IO ()
+doIfSet flag action | flag      = action
+		    | otherwise = return ()
 
+doIfSet_dyn :: DynFlags -> DynFlag -> IO () -> IO()
+doIfSet_dyn dflags flag action | dopt flag dflags = action
+		               | otherwise        = return ()
+\end{code}
 
-arityErr kind name n m sty =
-    ppBesides [ ppStr "`", ppr sty name, ppStr "' should have ",
-		n_arguments, ppStr ", but has been given ", ppInt m, ppChar '.']
-    where
-	errmsg = kind ++ " has too " ++ quantity ++ " arguments"
-	quantity | m < n     = "few"
-		 | otherwise = "many"
-	n_arguments | n == 0 = ppStr "no arguments"
-		    | n == 1 = ppStr "1 argument"
-		    | True   = ppCat [ppInt n, ppStr "arguments"]
+\begin{code}
+showPass :: DynFlags -> String -> IO ()
+showPass dflags what
+  | verbosity dflags >= 2 = hPutStr stderr ("*** "++what++":\n")
+  | otherwise		  = return ()
+
+dumpIfSet :: Bool -> String -> SDoc -> IO ()
+dumpIfSet flag hdr doc
+  | not flag   = return ()
+  | otherwise  = printDump (mkDumpDoc hdr doc)
+
+dumpIfSet_core :: DynFlags -> DynFlag -> String -> SDoc -> IO ()
+dumpIfSet_core dflags flag hdr doc
+  | dopt flag dflags
+	|| verbosity dflags >= 4
+	|| dopt Opt_D_verbose_core2core dflags 	= printDump (mkDumpDoc hdr doc)
+  | otherwise                                   = return ()
+
+dumpIfSet_dyn :: DynFlags -> DynFlag -> String -> SDoc -> IO ()
+dumpIfSet_dyn dflags flag hdr doc
+  | dopt flag dflags || verbosity dflags >= 4 
+  = if   flag `elem` [Opt_D_dump_stix, Opt_D_dump_asm]
+    then printForC stdout (mkDumpDoc hdr doc)
+    else printDump (mkDumpDoc hdr doc)
+  | otherwise
+  = return ()
+
+dumpIfSet_dyn_or :: DynFlags -> [DynFlag] -> String -> SDoc -> IO ()
+dumpIfSet_dyn_or dflags flags hdr doc
+  | or [dopt flag dflags | flag <- flags]
+  || verbosity dflags >= 4 
+  = printDump (mkDumpDoc hdr doc)
+  | otherwise = return ()
+
+mkDumpDoc hdr doc 
+   = vcat [text "", 
+	   line <+> text hdr <+> line,
+	   doc,
+	   text ""]
+     where 
+        line = text (replicate 20 '=')
 \end{code}