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RE: Interface between gc and clients to control conservative scan
Here's what I've been using.
Is this OK?
Thanks,
Andrew.
2006-04-21 Andrew Haley <aph@redhat.com>
* include/gc.h (GC_register_has_static_roots_callback): Declare.
* dyn_load.c (GC_has_static_roots): Declare.
(GC_register_dynlib_callback): Call GC_has_static_roots.
Index: boehm-gc/include/gc.h
===================================================================
--- boehm-gc/include/gc.h (revision 113114)
+++ boehm-gc/include/gc.h (working copy)
@@ -925,6 +925,15 @@
#endif /* THREADS && !SRC_M3 */
+/* Register a callback to control the scanning of dynamic libraries.
+ When the GC scans the static data of a dynamic library, it will
+ first call a user-supplied routine with filename of the library and
+ the address and length of the memory region. This routine should
+ return nonzero if that region should be scanned. */
+GC_API void GC_register_has_static_roots_callback
+ (int (*callback)(const char *, void *, size_t));
+
+
#if defined(GC_WIN32_THREADS) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)
# include <windows.h>
Index: boehm-gc/dyn_load.c
===================================================================
--- boehm-gc/dyn_load.c (revision 113114)
+++ boehm-gc/dyn_load.c (working copy)
@@ -119,6 +119,17 @@
# endif
# endif
+/* An user-supplied routine that is called to dtermine if a DSO must
+ be scanned by the gc. */
+static int (*GC_has_static_roots)(const char *, void *, size_t);
+/* Register the routine. */
+void
+GC_register_has_static_roots_callback
+ (int (*callback)(const char *, void *, size_t))
+{
+ GC_has_static_roots = callback;
+}
+
#if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES)
#ifdef LINT
@@ -371,7 +382,7 @@
{
return FALSE;
}
-
+
# define HAVE_REGISTER_MAIN_STATIC_DATA
#endif /* USE_PROC_FOR_LIBRARIES */
@@ -411,6 +422,11 @@
{
if( !(p->p_flags & PF_W) ) break;
start = ((char *)(p->p_vaddr)) + info->dlpi_addr;
+
+ if (GC_has_static_roots
+ && !GC_has_static_roots(info->dlpi_name, start, p->p_memsz))
+ break;
+
GC_add_roots_inner(start, start + p->p_memsz, TRUE);
}
break;