<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Addenda to Haskell 98</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="The Hugs 98 User's Guide" HREF="index.html"><LINK REL="UP" TITLE="Hugs vs Haskell 98 and addenda" HREF="haskell98.html"><LINK REL="PREVIOUS" TITLE="Hugs vs Haskell 98 and addenda" HREF="haskell98.html"><LINK REL="NEXT" TITLE="Language extensions supported by Hugs and GHC" HREF="hugs-ghc.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="hugs-ug.css"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Hugs 98 User's Guide</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="haskell98.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 5. Hugs <I CLASS="FOREIGNPHRASE" >vs</I > Haskell 98 and addenda</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="hugs-ghc.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="ADDENDA" >5.2. Addenda to Haskell 98</A ></H1 ><P >These addenda describe extensions that have been standardized across haskell implementations.</P ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="FFI" >5.2.1. Foreign Function Interface</A ></H2 ><P >The Haskell Foreign Function Interface, as described in the <A HREF="http://www.cse.unsw.edu.au/~chak/haskell/ffi/" TARGET="_top" >FFI addendum</A > is implemented except for the following limitations:</P ><P ></P ><UL ><LI ><P >Only the <TT CLASS="LITERAL" >ccall</TT >, <TT CLASS="LITERAL" >stdcall</TT > and <TT CLASS="LITERAL" >dotnet</TT > calling conventions are supported. All others are flagged as errors.</P ></LI ><LI ><P ><TT CLASS="LITERAL" >foreign export</TT > is not implemented.</P ></LI ><LI ><P ><TT CLASS="LITERAL" >foreign import "wrapper"</TT > is only implemented for the x86, PowerPC and Sparc architectures and has been most thoroughly tested on Windows and Linux using <B CLASS="COMMAND" >gcc</B >.</P ></LI ></UL ><P >Modules containing <TT CLASS="LITERAL" >foreign</TT > declarations must be compiled with <B CLASS="COMMAND" >ffihugs</B > before use (see <A HREF="ffihugs.html" >Section 4.2</A >).</P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="HIERARCHICAL-LIBRARIES" >5.2.2. Hierarchical Namespace Extension</A ></H2 ><P >The <A HREF="http://www.haskell.org/hierarchical-modules/" TARGET="_top" >Haskell Hierarchical Namespace Extension</A > allows dots in module names, e.g. <TT CLASS="LITERAL" >System.IO.Error</TT >, creating a hierarchical module namespace. Hugs has supported this since the December 2001 release. When searching for the source file corresponding to a hierarchical name, Hugs replaces the dots with slashes.</P ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="haskell98.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="hugs-ghc.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Hugs <I CLASS="FOREIGNPHRASE" >vs</I > Haskell 98 and addenda</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="haskell98.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Language extensions supported by Hugs and GHC</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
