[project @ 2002-11-08 12:52:51 by simonmar]

[ghc-hetmet.git] / ghc / rts / StgMiscClosures.hc

diff --git a/ghc/rts/StgMiscClosures.hc b/ghc/rts/StgMiscClosures.hc
index 6cb46b2..13a8809 100644 (file)
--- a/ghc/rts/StgMiscClosures.hc
+++ b/ghc/rts/StgMiscClosures.hc
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: StgMiscClosures.hc,v 1.74 2002/02/14 11:56:05 njn Exp $
+ * $Id: StgMiscClosures.hc,v 1.80 2002/09/17 12:34:31 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2000
  *
@@ -23,8 +23,8 @@
 # include "StgRun.h"   /* for StgReturn and register saving */
 #endif
 
-#ifdef HAVE_STDIO_H
-#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
 #endif
 
 /* ToDo: make the printing of panics more win32-friendly, i.e.,
@@ -36,14 +36,12 @@
   Template for the entry code of non-enterable closures.
 */
 
-#define NON_ENTERABLE_ENTRY_CODE(type)                                 \
-STGFUN(stg_##type##_entry)                                                     \
-{                                                                      \
-  FB_                                                                  \
-    DUMP_ERRMSG(#type " object entered!\n");                            \
-    STGCALL1(shutdownHaskellAndExit, EXIT_FAILURE);                    \
-    return NULL;                                                       \
-  FE_                                                                  \
+#define NON_ENTERABLE_ENTRY_CODE(type)         \
+STGFUN(stg_##type##_entry)                     \
+{                                              \
+  FB_                                          \
+    STGCALL1(barf, #type " object entered!\n");        \
+  FE_                                          \
 }
 
 
@@ -629,7 +627,7 @@ STGFUN(stg_SE_BLACKHOLE_entry)
   FE_
 }
 
-INFO_TABLE(SE_CAF_BLACKHOLE_info, SE_CAF_BLACKHOLE_entry,0,2,SE_CAF_BLACKHOLE,,EF_,"CAF_BLACKHOLE","CAF_BLACKHOLE");
+INFO_TABLE(stg_SE_CAF_BLACKHOLE_info, SE_CAF_BLACKHOLE_entry,0,2,SE_CAF_BLACKHOLE,,EF_,"CAF_BLACKHOLE","CAF_BLACKHOLE");
 STGFUN(stg_SE_CAF_BLACKHOLE_entry)
 {
   FB_
@@ -677,19 +675,12 @@ NON_ENTERABLE_ENTRY_CODE(EVACUATED);
 INFO_TABLE(stg_WEAK_info,stg_WEAK_entry,0,4,WEAK,,EF_,"WEAK","WEAK");
 NON_ENTERABLE_ENTRY_CODE(WEAK);
 
-// XXX! The garbage collector replaces a WEAK with a DEAD_WEAK
-// in-place, which causes problems if the heap is scanned linearly
-// after GC (certain kinds of profiling do this).  So when profiling,
-// we set the size of a DEAD_WEAK to 4 non-pointers, rather than its
-// usual 1.
-
-#ifdef PROFILING
-#define DEAD_WEAK_PAYLOAD_WORDS 4
-#else
-#define DEAD_WEAK_PAYLOAD_WORDS 1
-#endif
+// It's important when turning an existing WEAK into a DEAD_WEAK
+// (which is what finalizeWeak# does) that we don't lose the link
+// field and break the linked list of weak pointers.  Hence, we give
+// DEAD_WEAK 4 non-pointer fields, the same as WEAK.
 
-INFO_TABLE_CONSTR(stg_DEAD_WEAK_info,stg_DEAD_WEAK_entry,0,DEAD_WEAK_PAYLOAD_WORDS,0,CONSTR,,EF_,"DEAD_WEAK","DEAD_WEAK");
+INFO_TABLE_CONSTR(stg_DEAD_WEAK_info,stg_DEAD_WEAK_entry,0,4,0,CONSTR,,EF_,"DEAD_WEAK","DEAD_WEAK");
 NON_ENTERABLE_ENTRY_CODE(DEAD_WEAK);
 
 /* -----------------------------------------------------------------------------