// boehm.cc - interface between libjava and Boehm GC.
-/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation
This file is part of libgcj.
#undef TRUE
#undef FALSE
+// We include two autoconf headers. Avoid multiple definition warnings.
+#undef PACKAGE_NAME
+#undef PACKAGE_STRING
+#undef PACKAGE_TARNAME
+#undef PACKAGE_VERSION
+
+#ifdef HAVE_DLFCN_H
+#undef _GNU_SOURCE
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#endif
+
extern "C"
{
#include <gc_config.h>
// Freelist used for Java arrays.
static void **array_free_list;
+static int _Jv_GC_has_static_roots (const char *filename, void *, size_t);
+
\f
// This is called by the GC during the mark phase. It marks a Java
p = (GC_PTR) obj->sync_info;
MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, obj);
# endif
- // Mark the object's class.
- p = (GC_PTR) klass;
- MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, obj);
if (__builtin_expect (klass == &java::lang::Class::class$, false))
{
MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
p = (GC_PTR) c->aux_info;
MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
+
+ p = (GC_PTR) c->reflection_data;
+ MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
+
+ // The class chain must be marked for runtime-allocated Classes
+ // loaded by the bootstrap ClassLoader.
+ p = (GC_PTR) c->next_or_version;
+ MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
}
else
{
// we may need to round up the size.
if (__builtin_expect (! dt || !(dt -> get_finalizer()), false))
return mark_stack_ptr;
- jclass klass = dt->clas;
GC_PTR p;
p = (GC_PTR) dt;
p = (GC_PTR) array->sync_info;
MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, array);
# endif
- // Mark the object's class.
- p = (GC_PTR) klass;
- MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, &(dt -> clas));
for (int i = 0; i < JvGetArrayLength (array); ++i)
{
return (void *) GC_MALLOC (size ? size : 1);
}
+typedef _Jv_ClosureList *closure_list_pointer;
+
+/* Release closures in a _Jv_ClosureList. */
+static void
+finalize_closure_list (GC_PTR obj, GC_PTR)
+{
+ _Jv_ClosureList **clpp = (_Jv_ClosureList **)obj;
+ _Jv_ClosureList::releaseClosures (clpp);
+}
+
+/* Allocate a double-indirect pointer to a _Jv_ClosureList that will
+ get garbage-collected after this double-indirect pointer becomes
+ unreachable by any other objects, including finalizable ones. */
+_Jv_ClosureList **
+_Jv_ClosureListFinalizer ()
+{
+ _Jv_ClosureList **clpp;
+ clpp = (_Jv_ClosureList **)_Jv_AllocBytes (sizeof (*clpp));
+ GC_REGISTER_FINALIZER_UNREACHABLE (clpp, finalize_closure_list,
+ NULL, NULL, NULL);
+ return clpp;
+}
+
static void
call_finalizer (GC_PTR obj, GC_PTR client_data)
{
_Jv_InitGC (void)
{
int proc;
+ static bool gc_initialized;
+
+ if (gc_initialized)
+ return;
+
+ gc_initialized = 1;
// Ignore pointers that do not point to the start of an object.
GC_all_interior_pointers = 0;
+#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
+ // Tell the collector to ask us before scanning DSOs.
+ GC_register_has_static_roots_callback (_Jv_GC_has_static_roots);
+#endif
+
// Configure the collector to use the bitmap marking descriptors that we
// stash in the class vtable.
// We always use mark proc descriptor 0, since the compiler knows
// For now, always reclaim soft references. FIXME.
return true;
}
+
+\f
+
+#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
+
+// We keep a store of the filenames of DSOs that need to be
+// conservatively scanned by the garbage collector. During collection
+// the gc calls _Jv_GC_has_static_roots() to see if the data segment
+// of a DSO should be scanned.
+typedef struct filename_node
+{
+ char *name;
+ struct filename_node *link;
+} filename_node;
+
+#define FILENAME_STORE_SIZE 17
+static filename_node *filename_store[FILENAME_STORE_SIZE];
+
+// Find a filename in filename_store.
+static filename_node **
+find_file (const char *filename)
+{
+ int index = strlen (filename) % FILENAME_STORE_SIZE;
+ filename_node **node = &filename_store[index];
+
+ while (*node)
+ {
+ if (strcmp ((*node)->name, filename) == 0)
+ return node;
+ node = &(*node)->link;
+ }
+
+ return node;
+}
+
+// Print the store of filenames of DSOs that need collection.
+void
+_Jv_print_gc_store (void)
+{
+ for (int i = 0; i < FILENAME_STORE_SIZE; i++)
+ {
+ filename_node *node = filename_store[i];
+ while (node)
+ {
+ fprintf (stderr, "%s\n", node->name);
+ node = node->link;
+ }
+ }
+}
+
+// Create a new node in the store of libraries to collect.
+static filename_node *
+new_node (const char *filename)
+{
+ filename_node *node = (filename_node*)_Jv_Malloc (sizeof (filename_node));
+ node->name = (char *)_Jv_Malloc (strlen (filename) + 1);
+ node->link = NULL;
+ strcpy (node->name, filename);
+
+ return node;
+}
+
+// Nonzero if the gc should scan this lib.
+static int
+_Jv_GC_has_static_roots (const char *filename, void *, size_t)
+{
+ if (filename == NULL || strlen (filename) == 0)
+ // No filename; better safe than sorry.
+ return 1;
+
+ filename_node **node = find_file (filename);
+ if (*node)
+ return 1;
+
+ return 0;
+}
+
+#endif
+
+// Register the DSO that contains p for collection.
+void
+_Jv_RegisterLibForGc (const void *p __attribute__ ((__unused__)))
+{
+#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
+ Dl_info info;
+
+ if (dladdr (const_cast<void *>(p), &info) != 0)
+ {
+ filename_node **node = find_file (info.dli_fname);
+ if (! *node)
+ *node = new_node (info.dli_fname);
+ }
+#endif
+}
+
+void
+_Jv_SuspendThread (_Jv_Thread_t *thread)
+{
+#if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
+ && !defined(GC_WIN32_THREADS) && !defined(GC_DARWIN_THREADS)
+ GC_suspend_thread (_Jv_GetPlatformThreadID (thread));
+#endif
+}
+
+void
+_Jv_ResumeThread (_Jv_Thread_t *thread)
+{
+#if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
+ && !defined(GC_WIN32_THREADS) && !defined(GC_DARWIN_THREADS)
+ GC_resume_thread (_Jv_GetPlatformThreadID (thread));
+#endif
+}
+
+int
+_Jv_IsThreadSuspended (_Jv_Thread_t *thread)
+{
+#if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
+ && !defined(GC_WIN32_THREADS) && !defined(GC_DARWIN_THREADS)
+ return GC_is_thread_suspended (_Jv_GetPlatformThreadID (thread));
+#else
+ return 0;
+#endif
+}
+
+void
+_Jv_GCAttachThread ()
+{
+ // The registration interface is only defined on posixy systems and
+ // only actually works if pthread_getattr_np is defined.
+ // FIXME: until gc7 it is simpler to disable this on solaris.
+#if defined(HAVE_PTHREAD_GETATTR_NP) && !defined(GC_SOLARIS_THREADS)
+ GC_register_my_thread ();
+#endif
+}
+
+void
+_Jv_GCDetachThread ()
+{
+#if defined(HAVE_PTHREAD_GETATTR_NP) && !defined(GC_SOLARIS_THREADS)
+ GC_unregister_my_thread ();
+#endif
+}
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