finalize.c: - Accomodate finalization requests for static objects.

2001-04-04  Hans Boehm  <hans_boehm@hp.com>

	* finalize.c:
	- Accomodate finalization requests for static objects.
	  (Will be required by hash synchronization.  May be needed
	  in some configurations now.)

	* gc_priv.h:
	- Define MIN_WORDS.  All allocation requests are rounded
	  up to at least this size.  Removes a subtle assumption that
	  Java objects have a 2 word header.

	* gcconfig.h:
	- Adjust Linux/IA64 configuration for non-ancient kernels.
	  (Necessary fix for IA64.)

	* linux_threads.c:
	- Fix syntax error in currently unused code.  Will be needed
	  for Linux/PA-RISC.

	* malloc.c:
	- Handle MIN_WORDS.

	* misc.c:
	- Handle MIN_WORDS.
	- Change stack cleaning code to typically clear about one tenth
	  the memory it used to in the threads configuration.  Occasionally
	  still clear more.  (This is really a fix for a long-standing
	  and fairly significant performance bug with threads.)

	* os_dep.c:
	- Fix the code for finding the beginning of the data segment under
	  Linux.  I believe this is necessary for some IA64 Linux
	  distributions.  It will also helo other platforms, though those
	  may additionally require a gcconfig.h adjustment.  (This basically
	  works around the absence of a data_start or __data_start
	  definition in glibc.)

	* test.c:
	- Handle rounding due to MIN_WORDS.

From-SVN: r41102

1 files changed, 13 insertions, 4 deletions

diff --git a/boehm-gc/gcconfig.h b/boehm-gc/gcconfig.h
index 4cab9c7..84a4b3c 100644
--- a/boehm-gc/gcconfig.h
+++ b/boehm-gc/gcconfig.h
@@ -1116,11 +1116,20 @@
 #       define CPP_WORDSZ 64
 	/* This should really be done through /proc, but that	*/
 	/* requires we run on an IA64 kernel.			*/
-#       define STACKBOTTOM ((ptr_t) 0xa000000000000000l)
+	/* The following works on NUE and older kernels:	*/
+/* #       define STACKBOTTOM ((ptr_t) 0xa000000000000000l)	*/
+	/* This does not work on NUE:				*/
+#       define LINUX_STACKBOTTOM
 	/* We also need the base address of the register stack	*/
-	/* backing store.  There is probably a better way to	*/
-	/* get that, too ...					*/
-#	define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l)
+	/* backing store.  There should be a better way to get	*/
+	/* this:						*/
+#	define APPROX_BS_BASE ((word)GC_stackbottom-0x80000000)
+	/* We round to the next multiple of 1 MB, to compensate	*/
+	/* for the fact that the stack base is displaced by	*/
+	/* the environment, etc.				*/
+#	define BACKING_STORE_BASE \
+		(ptr_t)((APPROX_BS_BASE + 0xfffff) & ~0xfffff)
+
 #	if 1
 #	    define SEARCH_FOR_DATA_START
 #	    define DATASTART GC_data_start