Big tidy-up of deriving code

[ghc-hetmet.git] / compiler / parser / Parser.y.pp

diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp
index f349f30..889e4ce 100644 (file)
--- a/compiler/parser/Parser.y.pp
+++ b/compiler/parser/Parser.y.pp
@@ -31,7 +31,7 @@ import SrcLoc         ( Located(..), unLoc, getLoc, noLoc, combineSrcSpans,
                          SrcSpan, combineLocs, srcLocFile, 
                          mkSrcLoc, mkSrcSpan )
 import Module
-import StaticFlags     ( opt_SccProfilingOn )
+import StaticFlags     ( opt_SccProfilingOn, opt_Hpc )
 import Type            ( Kind, mkArrowKind, liftedTypeKind, unliftedTypeKind )
 import BasicTypes      ( Boxity(..), Fixity(..), FixityDirection(..), IPName(..),
                          Activation(..), defaultInlineSpec )
@@ -178,9 +178,9 @@ incorrect.
  'data'        { L _ ITdata } 
  'default'     { L _ ITdefault }
  'deriving'    { L _ ITderiving }
+ 'derived'     { L _ ITderived }
  'do'          { L _ ITdo }
  'else'        { L _ ITelse }
- 'for'                 { L _ ITfor }
  'hiding'      { L _ IThiding }
  'if'          { L _ ITif }
  'import'      { L _ ITimport }
@@ -223,6 +223,7 @@ incorrect.
  '{-# RULES'      { L _ ITrules_prag }
  '{-# CORE'        { L _ ITcore_prag }              -- hdaume: annotated core
  '{-# SCC'        { L _ ITscc_prag }
+ '{-# GENERATED'   { L _ ITgenerated_prag }
  '{-# DEPRECATED'  { L _ ITdeprecated_prag }
  '{-# UNPACK'      { L _ ITunpack_prag }
  '#-}'            { L _ ITclose_prag }
@@ -739,10 +740,7 @@ tycl_hdr :: { Located (LHsContext RdrName,
 
 -- Glasgow extension: stand-alone deriving declarations
 stand_alone_deriving :: { LDerivDecl RdrName }
-       : 'deriving' qtycon            'for' qtycon  {% do { p <- checkInstType (fmap HsTyVar $2)
-                                                          ; checkDerivDecl (LL (DerivDecl p $4)) } }
-
-        | 'deriving' '(' inst_type ')' 'for' qtycon  {% checkDerivDecl (LL (DerivDecl $3 $6)) }
+       : 'derived' 'instance' inst_type {% checkDerivDecl (LL (DerivDecl $3)) }
 
 -----------------------------------------------------------------------------
 -- Nested declarations
@@ -970,8 +968,13 @@ ctype      :: { LHsType RdrName }
 -- errors in ctype.  The basic problem is that
 --     (Eq a, Ord a)
 -- looks so much like a tuple type.  We can't tell until we find the =>
+--
+-- We have the t1 ~ t2 form here and in gentype, to permit an individual
+-- equational constraint without parenthesis.
 context :: { LHsContext RdrName }
-       : btype                         {% checkContext $1 }
+        : btype '~'      btype         {% checkContext
+                                            (LL $ HsPredTy (HsEqualP $1 $3)) }
+       | btype                         {% checkContext $1 }
 
 type :: { LHsType RdrName }
        : ipvar '::' gentype            { LL (HsPredTy (HsIParam (unLoc $1) $3)) }
@@ -981,7 +984,8 @@ gentype :: { LHsType RdrName }
         : btype                         { $1 }
         | btype qtyconop gentype        { LL $ HsOpTy $1 $2 $3 }
         | btype tyvarop  gentype       { LL $ HsOpTy $1 $2 $3 }
-       | btype '->' ctype              { LL $ HsFunTy $1 $3 }
+       | btype '->'     ctype          { LL $ HsFunTy $1 $3 }
+        | btype '~'      btype         { LL $ HsPredTy (HsEqualP $1 $3) }
 
 btype :: { LHsType RdrName }
        : btype atype                   { LL $ HsAppTy $1 $2 }
@@ -1263,6 +1267,9 @@ exp10 :: { LHsExpr RdrName }
         | scc_annot exp                                { LL $ if opt_SccProfilingOn
                                                        then HsSCC (unLoc $1) $2
                                                        else HsPar $2 }
+        | hpc_annot exp                                { LL $ if opt_Hpc
+                                                       then HsTickPragma (unLoc $1) $2
+                                                       else HsPar $2 }
 
        | 'proc' aexp '->' exp  
                        {% checkPattern $2 >>= \ p -> 
@@ -1278,6 +1285,18 @@ scc_annot :: { Located FastString }
        : '_scc_' STRING                        { LL $ getSTRING $2 }
        | '{-# SCC' STRING '#-}'                { LL $ getSTRING $2 }
 
+hpc_annot :: { Located (FastString,(Int,Int),(Int,Int)) }
+       : '{-# GENERATED' STRING INTEGER ':' INTEGER '-' INTEGER ':' INTEGER '#-}'
+                                               { LL $ (getSTRING $2
+                                                      ,( fromInteger $ getINTEGER $3
+                                                       , fromInteger $ getINTEGER $5
+                                                       )
+                                                      ,( fromInteger $ getINTEGER $7
+                                                       , fromInteger $ getINTEGER $9
+                                                       )
+                                                      )
+                                                }
+
 fexp   :: { LHsExpr RdrName }
        : fexp aexp                             { LL $ HsApp $1 $2 }
        | aexp                                  { $1 }
@@ -1719,7 +1738,7 @@ special_id
        : 'as'                  { L1 FSLIT("as") }
        | 'qualified'           { L1 FSLIT("qualified") }
        | 'hiding'              { L1 FSLIT("hiding") }
-        | 'for'                 { L1 FSLIT("for") }
+       | 'derived'             { L1 FSLIT("derived") }
        | 'export'              { L1 FSLIT("export") }
        | 'label'               { L1 FSLIT("label")  }
        | 'dynamic'             { L1 FSLIT("dynamic") }