Use MD5 checksums for recompilation checking (fixes #1372, #1959)

[ghc-hetmet.git] / compiler / basicTypes / Module.lhs

diff --git a/compiler/basicTypes/Module.lhs b/compiler/basicTypes/Module.lhs
index 9d60247..8d9cb3b 100644 (file)
--- a/compiler/basicTypes/Module.lhs
+++ b/compiler/basicTypes/Module.lhs
@@ -28,6 +28,8 @@ module Module
         packageIdString,
 
        -- * Wired-in PackageIds
+       primPackageId,
+       integerPackageId,
        basePackageId,
        rtsPackageId,
        haskell98PackageId,
@@ -40,6 +42,7 @@ module Module
        modulePackageId, moduleName,
        pprModule,
        mkModule,
+        stableModuleCmp,
 
        -- * The ModuleLocation type
        ModLocation(..),
@@ -62,14 +65,16 @@ module Module
        elemModuleSet
     ) where
 
-#include "HsVersions.h"
 import Outputable
 import qualified Pretty
 import Unique
 import FiniteMap
-import UniqFM
+import LazyUniqFM
 import FastString
 import Binary
+import Util
+
+import System.FilePath
 \end{code}
 
 %************************************************************************
@@ -178,7 +183,8 @@ mkModuleNameFS s = ModuleName s
 -- Returns the string version of the module name, with dots replaced by slashes
 moduleNameSlashes :: ModuleName -> String
 moduleNameSlashes = dots_to_slashes . moduleNameString
-  where dots_to_slashes = map (\c -> if c == '.' then '/' else c)
+  where dots_to_slashes = map (\c -> if c == '.' then pathSeparator else c)
+
 \end{code}
 
 %************************************************************************
@@ -202,8 +208,13 @@ instance Binary Module where
   put_ bh (Module p n) = put_ bh p >> put_ bh n
   get bh = do p <- get bh; n <- get bh; return (Module p n)
 
-instance Uniquable PackageId where
- getUnique pid = getUnique (packageIdFS pid)
+-- This gives a stable ordering, as opposed to the Ord instance which
+-- gives an ordering based on the Uniques of the components, which may
+-- not be stable from run to run of the compiler.
+stableModuleCmp :: Module -> Module -> Ordering
+stableModuleCmp (Module p1 n1) (Module p2 n2) 
+   = (packageIdFS  p1 `compare` packageIdFS  p2) `thenCmp`
+     (moduleNameFS n1 `compare` moduleNameFS n2)
 
 mkModule :: PackageId -> ModuleName -> Module
 mkModule = Module
@@ -232,9 +243,17 @@ pprPackagePrefix p mod = getPprStyle doc
 %************************************************************************
 
 \begin{code}
-newtype PackageId = PId FastString deriving( Eq, Ord )  -- includes the version
+newtype PackageId = PId FastString deriving( Eq )  -- includes the version
     -- here to avoid module loops with PackageConfig
 
+instance Uniquable PackageId where
+ getUnique pid = getUnique (packageIdFS pid)
+
+-- Note: *not* a stable lexicographic ordering, a faster unique-based
+-- ordering.
+instance Ord PackageId where
+  nm1 `compare` nm2 = getUnique nm1 `compare` getUnique nm2
+
 instance Outputable PackageId where
    ppr pid = text (packageIdString pid)
 
@@ -275,18 +294,21 @@ packageIdString = unpackFS . packageIdFS
 -- package that depends directly or indirectly on it (much as if you
 -- had used -ignore-package).
 
-basePackageId, rtsPackageId, haskell98PackageId, 
+integerPackageId, primPackageId,
+  basePackageId, rtsPackageId, haskell98PackageId,
   thPackageId, ndpPackageId, mainPackageId  :: PackageId
-basePackageId      = fsToPackageId FSLIT("base")
-rtsPackageId      = fsToPackageId FSLIT("rts")
-haskell98PackageId = fsToPackageId FSLIT("haskell98")
-thPackageId        = fsToPackageId FSLIT("template-haskell")
-ndpPackageId       = fsToPackageId FSLIT("ndp")
+primPackageId      = fsToPackageId (fsLit "ghc-prim")
+integerPackageId   = fsToPackageId (fsLit "integer")
+basePackageId      = fsToPackageId (fsLit "base")
+rtsPackageId      = fsToPackageId (fsLit "rts")
+haskell98PackageId = fsToPackageId (fsLit "haskell98")
+thPackageId        = fsToPackageId (fsLit "template-haskell")
+ndpPackageId       = fsToPackageId (fsLit "ndp")
 
 -- This is the package Id for the program.  It is the default package
 -- Id if you don't specify a package name.  We don't add this prefix
 -- to symbol name, since there can be only one main package per program.
-mainPackageId     = fsToPackageId FSLIT("main")
+mainPackageId     = fsToPackageId (fsLit "main")
 \end{code}
 
 %************************************************************************