[project @ 2004-08-20 11:20:16 by simonmar]

Give literal string labels a _str suffix, to make it less likely that
they'll clash with a symbol in scope in a C file.

ghc/compiler/cmm/CLabel.hs

@@ -28,6 +28,7 @@ module CLabel (
 	mkAltLabel,
 	mkDefaultLabel,
 	mkBitmapLabel,
+	mkStringLitLabel,
 
 	mkClosureTblLabel,
 
@@ -136,6 +137,9 @@ data CLabel
   | AsmTempLabel 
 	{-# UNPACK #-} !Unique
 
+  | StringLitLabel
+	{-# UNPACK #-} !Unique
+
   | ModuleInitLabel 
 	Module			-- the module name
 	String			-- its "way"
@@ -249,6 +253,7 @@ mkReturnInfoLabel uniq		= CaseLabel uniq CaseReturnInfo
 mkAltLabel      uniq tag	= CaseLabel uniq (CaseAlt tag)
 mkDefaultLabel  uniq 		= CaseLabel uniq CaseDefault
 
+mkStringLitLabel		= StringLitLabel
 mkAsmTempLabel 			= AsmTempLabel
 
 mkModuleInitLabel		= ModuleInitLabel
@@ -351,6 +356,7 @@ needsCDecl (PlainModuleInitLabel _)	= True
 needsCDecl ModuleRegdLabel		= False
 
 needsCDecl (CaseLabel _ _)		= False
+needsCDecl (StringLitLabel _)		= False
 needsCDecl (AsmTempLabel _)		= False
 needsCDecl (RtsLabel _)			= False
 needsCDecl (ForeignLabel _ _ _)		= False
@@ -372,6 +378,7 @@ isAsmTemp _ 	    	   = False
 
 externallyVisibleCLabel :: CLabel -> Bool -- not C "static"
 externallyVisibleCLabel (CaseLabel _ _)	   = False
+externallyVisibleCLabel (StringLitLabel _) = False
 externallyVisibleCLabel (AsmTempLabel _)   = False
 externallyVisibleCLabel (ModuleInitLabel _ _)= True
 externallyVisibleCLabel (PlainModuleInitLabel _)= True
@@ -536,6 +543,9 @@ pprAsmCLbl (ForeignLabel fs (Just sz) _)
 pprAsmCLbl lbl
    = pprCLbl lbl
 
+pprCLbl (StringLitLabel u)
+  = pprUnique u <> ptext SLIT("_str")
+
 pprCLbl (CaseLabel u CaseReturnPt)
   = hcat [pprUnique u, ptext SLIT("_ret")]
 pprCLbl (CaseLabel u CaseReturnInfo)

ghc/compiler/codeGen/CgUtils.hs

@@ -48,7 +48,7 @@ import MachOp		( MachRep(..), wordRep, MachOp(..),  MachHint(..),
 			  mo_wordULt, machRepByteWidth )
 import ForeignCall	( CCallConv(..) )
 import Literal		( Literal(..) )
-import CLabel		( CLabel, mkAsmTempLabel )
+import CLabel		( CLabel, mkStringLitLabel )
 import Digraph		( SCC(..), stronglyConnComp )
 import ListSetOps	( assocDefault )
 import Util		( filterOut, sortLe )
@@ -302,7 +302,7 @@ mkStringCLit :: String -> FCode CmmLit
 -- and return its label
 mkStringCLit str 
   = do 	{ uniq <- newUnique
-	; let lbl = mkAsmTempLabel uniq
+	; let lbl = mkStringLitLabel uniq
 	; emitData ReadOnlyData [CmmDataLabel lbl, CmmString str]
 	; return (CmmLabel lbl) }
 

ghc/driver/mangler/ghc-asm.lprl

@@ -494,8 +494,8 @@ sub mangle_asm {
 	    $chkcat[$i]  = 'data';
 	    $chksymb[$i] = '';
 
-	# Labels beginning "_c": these are literal strings.
-	} elsif ( /^${T_US}_c.*$/ ) {
+	# Labels ending "_str": these are literal strings.
+	} elsif ( /^${T_US}([A-Za-z0-9_]+)_str${T_POST_LBL}$/ ) {
 	    $chk[++$i]   = $_;
 	    $chkcat[$i]  = 'rodata';
 	    $chksymb[$i] = '';