Reorganisation of the source tree

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.

8 files changed, 145 insertions, 0 deletions

diff --git a/rts/hooks/FlagDefaults.c b/rts/hooks/FlagDefaults.c
new file mode 100644
index 0000000000..393d39bc39
--- /dev/null
+++ b/rts/hooks/FlagDefaults.c
@@ -0,0 +1,20 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+void
+defaultsHook (void)
+{ /* this is called *after* RTSflags has had
+     its defaults set, but *before* we start
+     processing the RTS command-line options.
+
+     This default version does *nothing*.
+     The user may provide a more interesting
+     one.
+  */
+}
+
diff --git a/rts/hooks/InitEachPE.c b/rts/hooks/InitEachPE.c
new file mode 100644
index 0000000000..cc9cdc0dba
--- /dev/null
+++ b/rts/hooks/InitEachPE.c
@@ -0,0 +1,23 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+#ifdef PAR
+void
+InitEachPEHook (void)
+{ /* In a GUM setup this is called on each
+     PE immediately before SynchroniseSystem.
+     It can be used to read in static data 
+     to each PE which has to be available to
+     each PE. See GPH-Maple as an example how to
+     use this in combination with foreign language
+     code:
+       http://www.risc.uni-linz.ac.at/software/ghc-maple/
+     -- HWL
+  */
+}
+#endif
diff --git a/rts/hooks/MallocFail.c b/rts/hooks/MallocFail.c
new file mode 100644
index 0000000000..1218d1d8d0
--- /dev/null
+++ b/rts/hooks/MallocFail.c
@@ -0,0 +1,16 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+#include <stdio.h>
+
+void
+MallocFailHook (lnat request_size /* in bytes */, char *msg)
+{
+    fprintf(stderr, "malloc: failed on request for %lu bytes; message: %s\n", request_size, msg);
+}
+
diff --git a/rts/hooks/OnExit.c b/rts/hooks/OnExit.c
new file mode 100644
index 0000000000..dd4c3b4bb0
--- /dev/null
+++ b/rts/hooks/OnExit.c
@@ -0,0 +1,19 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+/* Note: by the time this hook has been called, Haskell land
+ * will have been shut down completely.
+ *
+ * ToDo: feed the hook info on whether we're shutting down as a result
+ * of termination or run-time error ?
+ */
+ 
+void
+OnExitHook ()
+{
+}
diff --git a/rts/hooks/OutOfHeap.c b/rts/hooks/OutOfHeap.c
new file mode 100644
index 0000000000..98db0d7d49
--- /dev/null
+++ b/rts/hooks/OutOfHeap.c
@@ -0,0 +1,19 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+#include <stdio.h>
+
+void
+OutOfHeapHook (lnat request_size, lnat heap_size) /* both sizes in bytes */
+{
+  /*    fprintf(stderr, "Heap exhausted;\nwhile trying to allocate %lu bytes in a %lu-byte heap;\nuse `+RTS -H<size>' to increase the total heap size.\n", */
+
+  (void)request_size;   /* keep gcc -Wall happy */
+  fprintf(stderr, "Heap exhausted;\nCurrent maximum heap size is %lu bytes (%lu Mb);\nuse `+RTS -M<size>' to increase it.\n",
+	  heap_size, heap_size / (1024*1024));
+}
+
diff --git a/rts/hooks/RtsOpts.c b/rts/hooks/RtsOpts.c
new file mode 100644
index 0000000000..b934b05f1b
--- /dev/null
+++ b/rts/hooks/RtsOpts.c
@@ -0,0 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * Default RTS options.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+#include <stdlib.h>
+
+// Default RTS options can be given by providing an alternate
+// definition for this variable, pointing to a string of RTS options.
+char *ghc_rts_opts = NULL;
diff --git a/rts/hooks/ShutdownEachPEHook.c b/rts/hooks/ShutdownEachPEHook.c
new file mode 100644
index 0000000000..f5e3ba9344
--- /dev/null
+++ b/rts/hooks/ShutdownEachPEHook.c
@@ -0,0 +1,19 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+#ifdef PAR
+void
+ShutdownEachPEHook (void)
+{ /* In a GUM setup this routine is called at the end of 
+     shutdownParallelSystem on each PE. Useful for
+     cleaning up stuff, especially when interfacing 
+     with foreign language code.
+     -- HWL 
+  */
+}
+#endif
diff --git a/rts/hooks/StackOverflow.c b/rts/hooks/StackOverflow.c
new file mode 100644
index 0000000000..a395a3a1a5
--- /dev/null
+++ b/rts/hooks/StackOverflow.c
@@ -0,0 +1,16 @@
+/* -----------------------------------------------------------------------------
+ *
+ * User-overridable RTS hooks.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "Rts.h"
+
+#include <stdio.h>
+
+void
+StackOverflowHook (lnat stack_size)    /* in bytes */
+{
+    fprintf(stderr, "Stack space overflow: current size %ld bytes.\nUse `+RTS -Ksize' to increase it.\n", stack_size);
+}
+