X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Futils%2FStringBuffer.lhs;h=d7cfdddc2e31c1319aabdc5bd92baaec74acc564;hb=753d8919d892ed0f62fae63241f09610b1eda67e;hp=57ff9f4bf0537bc846bfcfde96003cafec198df8;hpb=13e40372870b3a36a3851e4a0f9a5b0f32f31148;p=ghc-hetmet.git

diff --git a/ghc/compiler/utils/StringBuffer.lhs b/ghc/compiler/utils/StringBuffer.lhs
index 57ff9f4..d7cfddd 100644
--- a/ghc/compiler/utils/StringBuffer.lhs
+++ b/ghc/compiler/utils/StringBuffer.lhs
@@ -7,6 +7,8 @@ Buffers for scanning string input stored in external arrays.
 
 \begin{code}
 
+{-# OPTIONS -optc-DNON_POSIX_SOURCE #-}
+
 module StringBuffer
        (
         StringBuffer,
@@ -30,9 +32,9 @@ module StringBuffer
 	lexemeIndex,	  -- :: StringBuffer -> Int#
 
 	 -- moving the end point of the current lexeme.
-        setCurrentPos#,   -- :: StringBuffer -> Int# -> StringBuffer
-	incLexeme,	  -- :: StringBuffer -> StringBuffer
-	decLexeme,	  -- :: StringBuffer -> StringBuffer
+        addToCurrentPos,   -- :: StringBuffer -> Int# -> StringBuffer
+	incCurrentPos,	  -- :: StringBuffer -> StringBuffer
+	decCurrentPos,	  -- :: StringBuffer -> StringBuffer
 
          -- move the start and end lexeme pointer on by x units.        
         stepOn,           -- :: StringBuffer -> StringBuffer
@@ -57,46 +59,52 @@ module StringBuffer
 
          -- conversion
         lexemeToString,     -- :: StringBuffer -> String
-        lexemeToByteArray,  -- :: StringBuffer -> _ByteArray Int
         lexemeToFastString, -- :: StringBuffer -> FastString
-        lexemeToBuffer,     -- :: StringBuffer -> StringBuffer
-
-        FastString,
-	ByteArray
        ) where
 
 #include "HsVersions.h"
 
-import GlaExts
-#if __GLASGOW_HASKELL__ < 411
-import PrelAddr 	( Addr(..) )
-#else
-import Addr		( Addr(..) )
-#endif
-import Foreign
-import Char		( chr )
-import Panic		( panic )
 
-import IO		( openFile  )
-import IOExts		( slurpFile )
-import PrelIOBase
-import PrelHandle
-import Addr
-#if __GLASGOW_HASKELL__ >= 411
+#if __GLASGOW_HASKELL__ < 502
+import Panic		( panic )
+#else
+#if __GLASGOW_HASKELL__ < 503
 import Ptr		( Ptr(..) )
+#else
+import GHC.Ptr		( Ptr(..) )
+#endif
 #endif
 
-import PrelPack		( unpackCStringBA )
-
-#if __GLASGOW_HASKELL__ >= 501
+#if __GLASGOW_HASKELL__  < 501
+import Char		( chr )
+#elif __GLASGOW_HASKELL__ < 503
 import PrelIO		( hGetcBuffered )
-import PrelCError	( throwErrnoIfMinus1RetryMayBlock )
-import PrelConc		( threadWaitRead )
+#else
+import GHC.IO		( hGetcBuffered )
 #endif
 
-import Exception	( bracket )
 import PrimPacked
 import FastString
+
+import GLAEXTS
+
+import Foreign
+
+#if __GLASGOW_HASKELL__ >= 502
+import CString ( newCString )
+#endif
+
+import IO		( openFile, isEOFError )
+import EXCEPTION	( bracket )
+
+#if __GLASGOW_HASKELL__ < 503
+import PrelIOBase
+import PrelHandle
+#else
+import GHC.IOBase
+import GHC.Handle
+#endif
+
 import Char 		( isDigit )
 \end{code} 
 
@@ -111,34 +119,26 @@ data StringBuffer
 
 \begin{code}
 instance Show StringBuffer where
-	showsPrec _ s = showString ""
+	showsPrec _ s = showString "<stringbuffer>"
 \end{code}
 
 \begin{code}
-hGetStringBuffer :: Bool -> FilePath -> IO StringBuffer
-hGetStringBuffer expand_tabs fname = do
-   (a, read) <- if expand_tabs 
-				then slurpFileExpandTabs fname 
-#if __GLASGOW_HASKELL__ < 411
-				else slurpFile fname
-#else
-				else do
-				    (Ptr a#, read) <- slurpFile fname
-				    return (A# a#, read)
-#endif
-
-   let (A# a#) = a;  (I# read#) = read
-
-         -- add sentinel '\NUL'
-   _casm_ `` ((char *)%0)[(int)%1]=(char)0; '' (A# a#) (I# (read# -# 1#))
-   return (StringBuffer a# read# 0# 0#)
-
-unsafeWriteBuffer :: StringBuffer -> Int# -> Char# -> StringBuffer
-unsafeWriteBuffer s@(StringBuffer a _ _ _) i# ch# =
- unsafePerformIO (
-   _casm_ `` ((char *)%0)[(int)%1]=(char)%2; '' (A# a) (I# i#) (C# ch#) >>= \ () ->
-   return s
- )
+hGetStringBuffer :: FilePath -> IO StringBuffer
+hGetStringBuffer fname = do
+   (a, read) <- slurpFileExpandTabs fname 
+
+	-- urk! slurpFile gives us a buffer that doesn't have room for
+	-- the sentinel.  Assume it has a final newline for now, and overwrite
+	-- that with the sentinel.  slurpFileExpandTabs (below) leaves room
+	-- for the sentinel.
+   let  (Ptr a#) = a;  
+	(I# read#) = read;
+	end# = read# -# 1#
+
+   -- add sentinel '\NUL'
+   writeCharOffPtr a (I# end#) '\0'
+
+   return (StringBuffer a# end# 0# 0#)
 \end{code}
 
 -----------------------------------------------------------------------------
@@ -148,18 +148,11 @@ unsafeWriteBuffer s@(StringBuffer a _ _ _) i# ch# =
 stringToStringBuffer :: String -> IO StringBuffer
 freeStringBuffer :: StringBuffer -> IO ()
 
-#if __GLASGOW_HASKELL__ >= 411
-stringToStringBuffer str =
-  do let sz@(I# sz#) = length str
-     (Ptr a#) <- mallocBytes (sz+1)
-     fill_in str (A# a#)
-     writeCharOffAddr (A# a#) sz '\0'		-- sentinel
-     return (StringBuffer a# sz# 0# 0#)
- where
-  fill_in [] _ = return ()
-  fill_in (c:cs) a = do
-    writeCharOffAddr a 0 c 
-    fill_in cs (a `plusAddr` 1)
+#if __GLASGOW_HASKELL__ >= 502
+stringToStringBuffer str = do
+  let sz@(I# sz#) = length str
+  Ptr a# <- newCString str
+  return (StringBuffer a# sz# 0# 0#)
 
 freeStringBuffer (StringBuffer a# _ _ _) = Foreign.free (Ptr a#)
 #else
@@ -180,24 +173,31 @@ We guess the size of the buffer required as 20% extra for
 expanded tabs, and enlarge it if necessary.
 
 \begin{code}
+#if __GLASGOW_HASKELL__ < 501
 getErrType :: IO Int
 getErrType =  _ccall_ getErrType__
+#endif
 
-slurpFileExpandTabs :: FilePath -> IO (Addr,Int)
+slurpFileExpandTabs :: FilePath -> IO (Ptr (),Int)
 slurpFileExpandTabs fname = do
   bracket (openFile fname ReadMode) (hClose) 
    (\ handle ->
      do sz <- hFileSize handle
         if sz > toInteger (maxBound::Int) 
-	  then IOERROR (userError "slurpFile: file too big")
+	  then ioError (userError "slurpFile: file too big")
           else do
       	    let sz_i = fromInteger sz
-      	        sz_i' = (sz_i * 12) `div` 10		-- add 20% for tabs
-      	    chunk <- allocMem sz_i'
-      	    trySlurp handle sz_i' chunk
+            if sz_i == 0
+			-- empty file: just allocate a buffer containing '\0'
+		then do chunk <- allocMem 1
+			writeCharOffPtr chunk 0 '\0'
+			return (chunk, 0)
+		else do let sz_i' = (sz_i * 12) `div` 10 -- add 20% for tabs
+	      	        chunk <- allocMem sz_i'
+      	    		trySlurp handle sz_i' chunk
    )
 
-trySlurp :: Handle -> Int -> Addr -> IO (Addr, Int)
+trySlurp :: Handle -> Int -> Ptr () -> IO (Ptr (), Int)
 trySlurp handle sz_i chunk =
 #if __GLASGOW_HASKELL__ < 501
   wantReadableHandle "hGetChar" handle $ \ handle_ ->
@@ -211,11 +211,11 @@ trySlurp handle sz_i chunk =
 
 	tAB_SIZE = 8#
 
-	slurpFile :: Int# -> Int# -> Addr -> Int# -> Int# -> IO (Addr, Int)
+	slurpFile :: Int# -> Int# -> Ptr () -> Int# -> Int# -> IO (Ptr (), Int)
 	slurpFile c off chunk chunk_sz max_off = slurp c off
 	 where
 
-	  slurp :: Int# -> Int# -> IO (Addr, Int)
+	  slurp :: Int# -> Int# -> IO (Ptr (), Int)
 	  slurp c off | off >=# max_off = do
 		let new_sz = chunk_sz *# 2#
 	     	chunk' <- reAllocMem chunk (I# new_sz)
@@ -233,7 +233,12 @@ trySlurp handle sz_i chunk =
 		buf <- readIORef ref
 		ch <- (if not (bufferEmpty buf)
 		      then hGetcBuffered fd ref buf
-		      else do new_buf <- fillReadBuffer fd True buf
+		      else do 
+#if __GLASGOW_HASKELL__ >= 503
+		              new_buf <- fillReadBuffer fd True False buf
+#else
+		              new_buf <- fillReadBuffer fd True buf
+#endif
 		              hGetcBuffered fd ref new_buf)
 		    `catch` \e -> if isEOFError e
 			then return '\xFFFF'
@@ -242,16 +247,16 @@ trySlurp handle sz_i chunk =
 			 '\xFFFF' -> return (chunk, I# off)
 #endif
 			 '\t' -> tabIt c off
-			 ch   -> do  writeCharOffAddr chunk (I# off) ch
+			 ch   -> do  writeCharOffPtr chunk (I# off) ch
 				     let c' | ch == '\n' = 0#
 					    | otherwise  = c +# 1#
 				     slurp c' (off +# 1#)
 
-	  tabIt :: Int# -> Int# -> IO (Addr, Int)
+	  tabIt :: Int# -> Int# -> IO (Ptr (), Int)
 	  -- can't run out of buffer in here, because we reserved an
 	  -- extra tAB_SIZE bytes at the end earlier.
 	  tabIt c off = do
-		writeCharOffAddr chunk (I# off) ' '
+		writeCharOffPtr chunk (I# off) ' '
 		let c' = c +# 1#
 		    off' = off +# 1#
 		if c' `remInt#` tAB_SIZE ==# 0#
@@ -264,23 +269,20 @@ trySlurp handle sz_i chunk =
 	-- and add 1 to allow room for the final sentinel \NUL at
 	-- the end of the file.
   (chunk', rc) <- slurpFile 0# 0# chunk chunk_sz (chunk_sz -# (tAB_SIZE +# 1#))
-#if __GLASGOW_HASKELL__ < 404
-  writeHandle handle handle_
-#endif
-  return (chunk', rc+1 {-room for sentinel-})
+  return (chunk', rc+1 {- room for sentinel -})
 
 
-reAllocMem :: Addr -> Int -> IO Addr
+reAllocMem :: Ptr () -> Int -> IO (Ptr ())
 reAllocMem ptr sz = do
-   chunk <- _ccall_ realloc ptr sz
-   if chunk == nullAddr 
+   chunk <- c_realloc ptr sz
+   if chunk == nullPtr 
       then fail "reAllocMem"
       else return chunk
 
-allocMem :: Int -> IO Addr
+allocMem :: Int -> IO (Ptr ())
 allocMem sz = do
-   chunk <- _ccall_ malloc sz
-   if chunk == nullAddr 
+   chunk <- c_malloc sz
+   if chunk == nullPtr 
 #if __GLASGOW_HASKELL__ < 501
       then constructErrorAndFail "allocMem"
 #else
@@ -288,6 +290,22 @@ allocMem sz = do
 					"out of memory" Nothing)
 #endif
       else return chunk
+
+#if __GLASGOW_HASKELL__ <= 408
+c_malloc sz = do A# a <- c_malloc' sz; return (Ptr a)
+foreign import ccall "malloc" unsafe
+  c_malloc' :: Int -> IO Addr
+
+c_realloc (Ptr a) sz = do A# a <- c_realloc' (A# a) sz; return (Ptr a)
+foreign import ccall "realloc" unsafe
+  c_realloc' :: Addr -> Int -> IO Addr
+#else
+foreign import ccall "malloc" unsafe
+  c_malloc :: Int -> IO (Ptr a)
+
+foreign import ccall "realloc" unsafe
+  c_realloc :: Ptr a -> Int -> IO (Ptr a)
+#endif
 \end{code}
 
 Lookup
@@ -322,16 +340,16 @@ lexemeIndex (StringBuffer fo# _ c# _) = c#
 
 \begin{code}
  -- moving the end point of the current lexeme.
-setCurrentPos# :: StringBuffer -> Int# -> StringBuffer
-setCurrentPos# (StringBuffer fo l# s# c#) i# =
+addToCurrentPos :: StringBuffer -> Int# -> StringBuffer
+addToCurrentPos (StringBuffer fo l# s# c#) i# =
  StringBuffer fo l# s# (c# +# i#)
 
 -- augmenting the current lexeme by one.
-incLexeme :: StringBuffer -> StringBuffer
-incLexeme (StringBuffer fo l# s# c#) = StringBuffer fo l# s# (c# +# 1#)
+incCurrentPos :: StringBuffer -> StringBuffer
+incCurrentPos (StringBuffer fo l# s# c#) = StringBuffer fo l# s# (c# +# 1#)
 
-decLexeme :: StringBuffer -> StringBuffer
-decLexeme (StringBuffer fo l# s# c#) = StringBuffer fo l# s# (c# -# 1#)
+decCurrentPos :: StringBuffer -> StringBuffer
+decCurrentPos (StringBuffer fo l# s# c#) = StringBuffer fo l# s# (c# -# 1#)
 
 \end{code}
 
@@ -482,38 +500,17 @@ stepOnUntilChar# (StringBuffer fo l# s# c#) x# =
 
          -- conversion
 lexemeToString :: StringBuffer -> String
-lexemeToString (StringBuffer fo _ start_pos# current#) = 
+lexemeToString (StringBuffer fo len# start_pos# current#) = 
  if start_pos# ==# current# then
     ""
  else
-    unpackCStringBA (copySubStr (A# fo) (I# start_pos#) (I# (current# -# start_pos#)))
-    
-lexemeToByteArray :: StringBuffer -> ByteArray Int
-lexemeToByteArray (StringBuffer fo _ start_pos# current#) = 
- if start_pos# ==# current# then
-    error "lexemeToByteArray" 
- else
-    copySubStr (A# fo) (I# start_pos#) (I# (current# -# start_pos#))
+    let len = I# (current# -# start_pos#) in
+    unpackNBytesBA (copySubStr fo (I# start_pos#) len) len
 
 lexemeToFastString :: StringBuffer -> FastString
 lexemeToFastString (StringBuffer fo l# start_pos# current#) =
  if start_pos# ==# current# then
-    mkFastCharString2 (A# fo) (I# 0#)
+    mkFastString ""
  else
-    mkFastSubString (A# fo) (I# start_pos#) (I# (current# -# start_pos#))
-
-{-
- Create a StringBuffer from the current lexeme, and add a sentinel
- at the end. Know What You're Doing before taking this function
- into use..
--}
-lexemeToBuffer :: StringBuffer -> StringBuffer
-lexemeToBuffer (StringBuffer fo l# start_pos# current#) =
- if start_pos# ==# current# then
-    StringBuffer fo 0# start_pos# current# -- an error, really. 
- else
-    unsafeWriteBuffer (StringBuffer fo (current# -# start_pos#) start_pos# start_pos#)
-		      (current# -# 1#)
-		      '\NUL'#
-
+    mkFastSubString fo (I# start_pos#) (I# (current# -# start_pos#))
 \end{code}