Fix CodingStyle#Warnings URLs

[ghc-hetmet.git] / compiler / stgSyn / StgSyn.lhs

diff --git a/compiler/stgSyn/StgSyn.lhs b/compiler/stgSyn/StgSyn.lhs
index 74832a2..b97e766 100644 (file)
--- a/compiler/stgSyn/StgSyn.lhs
+++ b/compiler/stgSyn/StgSyn.lhs
@@ -9,6 +9,13 @@ form of @CoreSyntax@, the style being one that happens to be ideally
 suited to spineless tagless code generation.
 
 \begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
 module StgSyn (
        GenStgArg(..), 
        GenStgLiveVars,
@@ -67,6 +74,7 @@ import UniqSet                ( isEmptyUniqSet, uniqSetToList, UniqSet )
 import Unique          ( Unique )
 import Bitmap
 import StaticFlags     ( opt_SccProfilingOn )
+import Module          ( Module, pprModule )
 \end{code}
 
 %************************************************************************
@@ -167,13 +175,16 @@ constructors, primitives, and literals.
 \begin{code}
   | StgLit     Literal
   
+       -- StgConApp is vital for returning unboxed tuples
+       -- which can't be let-bound first
   | StgConApp  DataCon
                [GenStgArg occ] -- Saturated
 
   | StgOpApp   StgOp           -- Primitive op or foreign call
                [GenStgArg occ] -- Saturated
-               Type            -- Result type; we need to know the result type
-                               -- so that we can assign result registers.
+               Type            -- Result type
+                               -- We need to know this so that we can 
+                               -- assign result registers
 \end{code}
 
 %************************************************************************
@@ -349,6 +360,21 @@ Finally for @scc@ expressions we introduce a new STG construct.
   | StgSCC
        CostCentre              -- label of SCC expression
        (GenStgExpr bndr occ)   -- scc expression
+\end{code}
+
+%************************************************************************
+%*                                                                     *
+\subsubsection{@GenStgExpr@: @hpc@ expressions}
+%*                                                                     *
+%************************************************************************
+
+Finally for @scc@ expressions we introduce a new STG construct.
+
+\begin{code}
+  | StgTick
+    Module                     -- the module of the source of this tick
+    Int                                -- tick number
+    (GenStgExpr bndr occ)      -- sub expression
   -- end of GenStgExpr
 \end{code}
 
@@ -719,6 +745,10 @@ pprStgExpr (StgSCC cc expr)
   = sep [ hsep [ptext SLIT("_scc_"), ppr cc],
          pprStgExpr expr ]
 
+pprStgExpr (StgTick m n expr)
+  = sep [ hsep [ptext SLIT("_tick_"),  pprModule m,text (show n)],
+         pprStgExpr expr ]
+
 pprStgExpr (StgCase expr lvs_whole lvs_rhss bndr srt alt_type alts)
   = sep [sep [ptext SLIT("case"),
           nest 4 (hsep [pprStgExpr expr,