RTS tidyup sweep, first phase

The first phase of this tidyup is focussed on the header files, and in
particular making sure we are exposinng publicly exactly what we need
to, and no more.

 - Rts.h now includes everything that the RTS exposes publicly,
   rather than a random subset of it.

 - Most of the public header files have moved into subdirectories, and
   many of them have been renamed.  But clients should not need to
   include any of the other headers directly, just #include the main
   public headers: Rts.h, HsFFI.h, RtsAPI.h.

 - All the headers needed for via-C compilation have moved into the
   stg subdirectory, which is self-contained.  Most of the headers for
   the rest of the RTS APIs have moved into the rts subdirectory.

 - I left MachDeps.h where it is, because it is so widely used in
   Haskell code.
 
 - I left a deprecated stub for RtsFlags.h in place.  The flag
   structures are now exposed by Rts.h.

 - Various internal APIs are no longer exposed by public header files.

 - Various bits of dead code and declarations have been removed

 - More gcc warnings are turned on, and the RTS code is more
   warning-clean.

 - More source files #include "PosixSource.h", and hence only use
   standard POSIX (1003.1c-1995) interfaces.

There is a lot more tidying up still to do, this is just the first
pass.  I also intend to standardise the names for external RTS APIs
(e.g use the rts_ prefix consistently), and declare the internal APIs
as hidden for shared libraries.

1 files changed, 48 insertions, 0 deletions

diff --git a/includes/stg/DLL.h b/includes/stg/DLL.h
new file mode 100644
index 0000000000..5e824271bf
--- /dev/null
+++ b/includes/stg/DLL.h
@@ -0,0 +1,48 @@
+#ifndef __STGDLL_H__
+#define __STGDLL_H__ 1
+
+#if defined(__PIC__) && defined(mingw32_TARGET_OS)
+#  define DLL_IMPORT_DATA_REF(x) (_imp__##x)
+#  define DLL_IMPORT_DATA_VARNAME(x) *_imp__##x
+#  if __GNUC__ && !defined(__declspec)
+#    define DLLIMPORT
+#  else
+#    define DLLIMPORT __declspec(dllimport)
+#    define DLLIMPORT_DATA(x) _imp__##x
+#  endif
+#else
+#  define DLL_IMPORT_DATA_REF(x) (&(x))
+#  define DLL_IMPORT_DATA_VARNAME(x) x
+#  define DLLIMPORT
+#endif
+
+/* The view of the ghc/includes/ header files differ ever so
+   slightly depending on whether the RTS is being compiled
+   or not - so we're forced to distinguish between two.
+   [oh, you want details :) : Data symbols defined by the RTS
+    have to be accessed through an extra level of indirection
+    when compiling generated .hc code compared to when the RTS
+    sources are being processed. This is only the case when 
+    using Win32 DLLs. ]
+*/
+#ifdef COMPILING_RTS
+#define DLL_IMPORT DLLIMPORT
+#define DLL_IMPORT_RTS
+#define DLL_IMPORT_DATA_VAR(x) x
+#else
+#define DLL_IMPORT
+#define DLL_IMPORT_RTS DLLIMPORT
+# if defined(__PIC__) && defined(mingw32_TARGET_OS)
+#  define DLL_IMPORT_DATA_VAR(x) _imp__##x
+# else
+#  define DLL_IMPORT_DATA_VAR(x) x
+# endif
+#endif
+
+#ifdef COMPILING_STDLIB
+#define DLL_IMPORT_STDLIB
+#else
+#define DLL_IMPORT_STDLIB DLLIMPORT
+#endif
+
+#endif /* __STGDLL_H__ */