X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FDriverPhases.hs;h=2efe293bd63cfde7e3a882dd3ed1259c6e5f7373;hb=70b6c54b3c140d96b69287f8f400f88a0b7e9c18;hp=9c9794db7c1dff4a847454549c8028cd4d9bd44a;hpb=d9d000465e182da49260b15d477d688b63c12a17;p=ghc-hetmet.git

diff --git a/ghc/compiler/main/DriverPhases.hs b/ghc/compiler/main/DriverPhases.hs
index 9c9794d..2efe293 100644
--- a/ghc/compiler/main/DriverPhases.hs
+++ b/ghc/compiler/main/DriverPhases.hs
@@ -1,5 +1,5 @@
 -----------------------------------------------------------------------------
--- $Id: DriverPhases.hs,v 1.24 2003/05/21 12:46:19 simonmar Exp $
+-- $Id: DriverPhases.hs,v 1.25 2003/06/04 15:47:59 simonmar Exp $
 --
 -- GHC Driver
 --
@@ -11,6 +11,7 @@
 
 module DriverPhases (
    Phase(..),
+   happensBefore,
    startPhase,		-- :: String -> Phase
    phaseInputExt, 	-- :: Phase -> String
 
@@ -40,8 +41,7 @@ import DriverUtil
 -}
 
 data Phase 
-	= MkDependHS	-- haskell dependency generation
-	| Unlit
+	= Unlit
 	| Cpp
 	| HsPp
 	| Hsc
@@ -58,6 +58,17 @@ data Phase
 #endif
   deriving (Eq, Show)
 
+-- Partial ordering on phases: we want to know which phases will occur before 
+-- which others.  This is used for sanity checking, to ensure that the
+-- pipeline will stop at some point (see DriverPipeline.runPipeline).
+x `happensBefore` y 
+	| x `elem` haskell_pipe = y `elem` tail (dropWhile (/= x) haskell_pipe)
+	| x `elem` c_pipe       = y `elem` tail (dropWhile (/= x) c_pipe)
+	| otherwise = False
+
+haskell_pipe = [Unlit,Cpp,HsPp,Hsc,HCc,Mangle,As,Ln]
+c_pipe       = [Cc,As,Ln]
+
 -- the first compilation phase for a given file is determined
 -- by its suffix.
 startPhase "lhs"   = Unlit
@@ -90,7 +101,6 @@ phaseInputExt SplitMangle = "split_s"	-- not really generated
 phaseInputExt As          = "s"
 phaseInputExt SplitAs     = "split_s"   -- not really generated
 phaseInputExt Ln          = "o"
-phaseInputExt MkDependHS  = "dep"
 #ifdef ILX
 phaseInputExt Ilx2Il      = "ilx"
 phaseInputExt Ilasm       = "il"