/*
* boehm-gc.c: GC implementation using either the installed or included Boehm GC.
*
+ * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
+ * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
*/
#include "config.h"
+
+#include <string.h>
+
#define GC_I_HIDE_POINTERS
-#include <mono/os/gc_wrapper.h>
+#include <mono/metadata/gc-internal.h>
#include <mono/metadata/mono-gc.h>
#include <mono/metadata/gc-internal.h>
#include <mono/metadata/profiler-private.h>
-#include <mono/utils/mono-logger.h>
+#include <mono/metadata/class-internals.h>
+#include <mono/metadata/method-builder.h>
+#include <mono/metadata/opcodes.h>
+#include <mono/metadata/domain-internals.h>
+#include <mono/metadata/metadata-internals.h>
+#include <mono/metadata/marshal.h>
+#include <mono/utils/mono-logger-internal.h>
+#include <mono/utils/mono-time.h>
+#include <mono/utils/dtrace.h>
+#include <mono/utils/gc_wrapper.h>
#if HAVE_BOEHM_GC
+#ifdef USE_INCLUDED_LIBGC
+#undef TRUE
+#undef FALSE
+#define THREAD_LOCAL_ALLOC 1
+#include "private/pthread_support.h"
+#endif
+
+#define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
+/*Boehm max heap cannot be smaller than 16MB*/
+#define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
+#define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
+
+static gboolean gc_initialized = FALSE;
+
static void
mono_gc_warning (char *msg, GC_word arg)
{
void
mono_gc_base_init (void)
{
+ char *env;
+
+ if (gc_initialized)
+ return;
+
+ /*
+ * Handle the case when we are called from a thread different from the main thread,
+ * confusing libgc.
+ * FIXME: Move this to libgc where it belongs.
+ *
+ * we used to do this only when running on valgrind,
+ * but it happens also in other setups.
+ */
+#if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
+ {
+ size_t size;
+ void *sstart;
+ pthread_attr_t attr;
+ pthread_getattr_np (pthread_self (), &attr);
+ pthread_attr_getstack (&attr, &sstart, &size);
+ pthread_attr_destroy (&attr);
+ /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
+#ifdef __ia64__
+ /*
+ * The calculation above doesn't seem to work on ia64, also we need to set
+ * GC_register_stackbottom as well, but don't know how.
+ */
+#else
+ /* apparently with some linuxthreads implementations sstart can be NULL,
+ * fallback to the more imprecise method (bug# 78096).
+ */
+ if (sstart) {
+ GC_stackbottom = (char*)sstart + size;
+ } else {
+ int dummy;
+ gsize stack_bottom = (gsize)&dummy;
+ stack_bottom += 4095;
+ stack_bottom &= ~4095;
+ GC_stackbottom = (char*)stack_bottom;
+ }
+#endif
+ }
+#elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
+ GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
+#elif defined(__OpenBSD__)
+# include <pthread_np.h>
+ {
+ stack_t ss;
+ int rslt;
+
+ rslt = pthread_stackseg_np(pthread_self(), &ss);
+ g_assert (rslt == 0);
+
+ GC_stackbottom = (char*)ss.ss_sp;
+ }
+#elif defined(__native_client__)
+ /* Do nothing, GC_stackbottom is set correctly in libgc */
+#else
+ {
+ int dummy;
+ gsize stack_bottom = (gsize)&dummy;
+ stack_bottom += 4095;
+ stack_bottom &= ~4095;
+ /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
+ GC_stackbottom = (char*)stack_bottom;
+ }
+#endif
+
+#if !defined(PLATFORM_ANDROID)
+ /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
GC_no_dls = TRUE;
+#endif
+ GC_init ();
GC_oom_fn = mono_gc_out_of_memory;
GC_set_warn_proc (mono_gc_warning);
GC_finalize_on_demand = 1;
GC_finalizer_notifier = mono_gc_finalize_notify;
+
+#ifdef HAVE_GC_GCJ_MALLOC
+ GC_init_gcj_malloc (5, NULL);
+#endif
+
+#ifdef HAVE_GC_ALLOW_REGISTER_THREADS
+ GC_allow_register_threads();
+#endif
+
+ if ((env = getenv ("MONO_GC_PARAMS"))) {
+ char **ptr, **opts = g_strsplit (env, ",", -1);
+ for (ptr = opts; *ptr; ++ptr) {
+ char *opt = *ptr;
+ if (g_str_has_prefix (opt, "max-heap-size=")) {
+ glong max_heap;
+
+ opt = strchr (opt, '=') + 1;
+ if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
+ if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
+ fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
+ exit (1);
+ }
+ GC_set_max_heap_size (max_heap);
+ } else {
+ fprintf (stderr, "max-heap-size must be an integer.\n");
+ exit (1);
+ }
+ continue;
+ } else {
+ fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
+ fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
+ exit (1);
+ }
+ }
+ g_strfreev (opts);
+ }
+
+ mono_gc_enable_events ();
+ gc_initialized = TRUE;
}
+/**
+ * mono_gc_collect:
+ * @generation: GC generation identifier
+ *
+ * Perform a garbage collection for the given generation, higher numbers
+ * mean usually older objects. Collecting a high-numbered generation
+ * implies collecting also the lower-numbered generations.
+ * The maximum value for @generation can be retrieved with a call to
+ * mono_gc_max_generation(), so this function is usually called as:
+ *
+ * mono_gc_collect (mono_gc_max_generation ());
+ */
void
mono_gc_collect (int generation)
{
+ MONO_PROBE_GC_BEGIN (generation);
+
+ mono_perfcounters->gc_induced++;
GC_gcollect ();
+
+ MONO_PROBE_GC_END (generation);
+#if defined(ENABLE_DTRACE) && defined(__sun__)
+ /* This works around a dtrace -G problem on Solaris.
+ Limit its actual use to when the probe is enabled. */
+ if (MONO_PROBE_GC_END_ENABLED ())
+ sleep(0);
+#endif
}
+/**
+ * mono_gc_max_generation:
+ *
+ * Get the maximum generation number used by the current garbage
+ * collector. The value will be 0 for the Boehm collector, 1 or more
+ * for the generational collectors.
+ *
+ * Returns: the maximum generation number.
+ */
int
mono_gc_max_generation (void)
{
return 0;
}
+/**
+ * mono_gc_get_generation:
+ * @object: a managed object
+ *
+ * Get the garbage collector's generation that @object belongs to.
+ * Use this has a hint only.
+ *
+ * Returns: a garbage collector generation number
+ */
int
mono_gc_get_generation (MonoObject *object)
{
return 0;
}
+/**
+ * mono_gc_collection_count:
+ * @generation: a GC generation number
+ *
+ * Get how many times a garbage collection has been performed
+ * for the given @generation number.
+ *
+ * Returns: the number of garbage collections
+ */
int
mono_gc_collection_count (int generation)
{
return GC_gc_no;
}
+/**
+ * mono_gc_add_memory_pressure:
+ * @value: amount of bytes
+ *
+ * Adjust the garbage collector's view of how many bytes of memory
+ * are indirectly referenced by managed objects (for example unmanaged
+ * memory holding image or other binary data).
+ * This is a hint only to the garbage collector algorithm.
+ * Note that negative amounts of @value will decrease the memory
+ * pressure.
+ */
void
mono_gc_add_memory_pressure (gint64 value)
{
}
-gint64
+/**
+ * mono_gc_get_used_size:
+ *
+ * Get the approximate amount of memory used by managed objects.
+ *
+ * Returns: the amount of memory used in bytes
+ */
+int64_t
mono_gc_get_used_size (void)
{
return GC_get_heap_size () - GC_get_free_bytes ();
}
-gint64
+/**
+ * mono_gc_get_heap_size:
+ *
+ * Get the amount of memory used by the garbage collector.
+ *
+ * Returns: the size of the heap in bytes
+ */
+int64_t
mono_gc_get_heap_size (void)
{
return GC_get_heap_size ();
gboolean
mono_gc_is_gc_thread (void)
{
-#ifdef USE_INCLUDED_LIBGC
+#if GC_VERSION_MAJOR >= 7
+ return TRUE;
+#elif defined(USE_INCLUDED_LIBGC)
return GC_thread_is_registered ();
#else
return TRUE;
gboolean
mono_gc_register_thread (void *baseptr)
{
+#if GC_VERSION_MAJOR >= 7
+ struct GC_stack_base sb;
+ int res;
+
+ res = GC_get_stack_base (&sb);
+ if (res != GC_SUCCESS) {
+ sb.mem_base = baseptr;
+#ifdef __ia64__
+ /* Can't determine the register stack bounds */
+ g_error ("mono_gc_register_thread failed ().\n");
+#endif
+ }
+ res = GC_register_my_thread (&sb);
+ if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
+ g_warning ("GC_register_my_thread () failed.\n");
+ return FALSE;
+ }
+ return TRUE;
+#else
if (mono_gc_is_gc_thread())
return TRUE;
-#if defined(USE_INCLUDED_LIBGC) && !defined(PLATFORM_WIN32)
+#if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
return GC_thread_register_foreign (baseptr);
#else
return FALSE;
#endif
+#endif
}
-extern int GC_is_marked (void *p);
-
gboolean
mono_object_is_alive (MonoObject* o)
{
#ifdef USE_INCLUDED_LIBGC
- return GC_is_marked (o);
+ return GC_is_marked ((gpointer)o);
#else
return TRUE;
#endif
}
+int
+mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
+{
+ return 1;
+}
+
#ifdef USE_INCLUDED_LIBGC
+static gint64 gc_start_time;
+
static void
on_gc_notification (GCEventType event)
{
+ if (event == MONO_GC_EVENT_START) {
+ mono_perfcounters->gc_collections0++;
+ mono_stats.major_gc_count ++;
+ gc_start_time = mono_100ns_ticks ();
+ } else if (event == MONO_GC_EVENT_END) {
+ guint64 heap_size = GC_get_heap_size ();
+ guint64 used_size = heap_size - GC_get_free_bytes ();
+ mono_perfcounters->gc_total_bytes = used_size;
+ mono_perfcounters->gc_committed_bytes = heap_size;
+ mono_perfcounters->gc_reserved_bytes = heap_size;
+ mono_perfcounters->gc_gen0size = heap_size;
+ mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
+ mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
+ }
mono_profiler_gc_event ((MonoGCEvent) event, 0);
}
static void
on_gc_heap_resize (size_t new_size)
{
+ guint64 heap_size = GC_get_heap_size ();
+ mono_perfcounters->gc_committed_bytes = heap_size;
+ mono_perfcounters->gc_reserved_bytes = heap_size;
+ mono_perfcounters->gc_gen0size = heap_size;
mono_profiler_gc_heap_resize (new_size);
}
#endif
+int
+mono_gc_register_root (char *start, size_t size, void *descr)
+{
+ /* for some strange reason, they want one extra byte on the end */
+ GC_add_roots (start, start + size + 1);
+
+ return TRUE;
+}
+
+void
+mono_gc_deregister_root (char* addr)
+{
+#ifndef HOST_WIN32
+ /* FIXME: libgc doesn't define this work win32 for some reason */
+ /* FIXME: No size info */
+ GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
+#endif
+}
+
void
-mono_gc_weak_link_add (void **link_addr, MonoObject *obj)
+mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
{
/* libgc requires that we use HIDE_POINTER... */
*link_addr = (void*)HIDE_POINTER (obj);
*link_addr = NULL;
}
+static gpointer
+reveal_link (gpointer link_addr)
+{
+ void **link_a = link_addr;
+ return REVEAL_POINTER (*link_a);
+}
+
MonoObject*
mono_gc_weak_link_get (void **link_addr)
{
- MonoObject *obj = REVEAL_POINTER (*link_addr);
+ MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
if (obj == (MonoObject *) -1)
return NULL;
return obj;
}
+void*
+mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
+{
+ return mono_gc_make_descr_from_bitmap (bitmap, numbits);
+}
+
+void*
+mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
+{
+ return mono_gc_make_descr_from_bitmap (bitmap, numbits);
+}
+
+void*
+mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
+{
+ /* libgc has no usable support for arrays... */
+ return GC_NO_DESCRIPTOR;
+}
+
void*
mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
+{
+#ifdef HAVE_GC_GCJ_MALLOC
+ /* It seems there are issues when the bitmap doesn't fit: play it safe */
+ if (numbits >= 30)
+ return GC_NO_DESCRIPTOR;
+ else
+ return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
+#else
+ return NULL;
+#endif
+}
+
+void*
+mono_gc_make_root_descr_all_refs (int numbits)
{
return NULL;
}
void*
mono_gc_alloc_fixed (size_t size, void *descr)
{
- return GC_MALLOC (size);
+ /* To help track down typed allocation bugs */
+ /*
+ static int count;
+ count ++;
+ if (count == atoi (getenv ("COUNT2")))
+ printf ("HIT!\n");
+ if (count > atoi (getenv ("COUNT2")))
+ return GC_MALLOC (size);
+ */
+
+ if (descr)
+ return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
+ else
+ return GC_MALLOC (size);
}
void
return GC_should_invoke_finalizers ();
}
+/*
+ * LOCKING: Assumes the domain_finalizers lock is held.
+ */
+static void
+add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
+{
+ GSList *refs;
+
+ if (!domain->track_resurrection_objects_hash)
+ domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
+
+ refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
+ refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
+ g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
+}
+
+void
+mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
+{
+ MonoDomain *domain;
+
+ if (!obj)
+ return;
+
+ domain = mono_object_get_domain (obj);
+
+ mono_domain_finalizers_lock (domain);
+
+ add_weak_track_handle_internal (domain, obj, handle);
+
+ g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
+
+ mono_domain_finalizers_unlock (domain);
+}
+
+/*
+ * LOCKING: Assumes the domain_finalizers lock is held.
+ */
+static void
+remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
+{
+ GSList *refs;
+
+ if (!domain->track_resurrection_objects_hash)
+ return;
+
+ refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
+ refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
+ g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
+}
+
+void
+mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
+{
+ MonoDomain *domain = mono_domain_get ();
+
+ mono_domain_finalizers_lock (domain);
+
+ if (old_obj)
+ remove_weak_track_handle_internal (domain, old_obj, gchandle);
+ if (obj)
+ add_weak_track_handle_internal (domain, obj, gchandle);
+
+ mono_domain_finalizers_unlock (domain);
+}
+
+void
+mono_gc_remove_weak_track_handle (guint32 gchandle)
+{
+ MonoDomain *domain = mono_domain_get ();
+ MonoObject *obj;
+
+ /* Clean our entries in the two hashes in MonoDomain */
+
+ mono_domain_finalizers_lock (domain);
+
+ /* Get the original object this handle pointed to */
+ obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
+ if (obj) {
+ g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
+
+ remove_weak_track_handle_internal (domain, obj, gchandle);
+ }
+
+ mono_domain_finalizers_unlock (domain);
+}
+
+GSList*
+mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
+{
+ GSList *refs = NULL;
+
+ if (domain->track_resurrection_objects_hash) {
+ refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
+
+ if (refs)
+ /*
+ * Since we don't run finalizers again for resurrected objects,
+ * no need to keep these around.
+ */
+ g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
+ }
+
+ return refs;
+}
+
void
mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
{
}
void
-mono_gc_wbarrier_arrayref_copy (MonoArray *arr, gpointer slot_ptr, int count)
+mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
{
- /* no need to do anything */
+ memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
}
void
*(void**)ptr = value;
}
+void
+mono_gc_wbarrier_generic_nostore (gpointer ptr)
+{
+}
+
void
mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
{
+ memmove (dest, src, count * mono_class_value_size (klass, NULL));
}
-#endif /* no Boehm GC */
+void
+mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
+{
+ /* do not copy the sync state */
+ memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
+ mono_object_class (obj)->instance_size - sizeof (MonoObject));
+}
+
+void
+mono_gc_clear_domain (MonoDomain *domain)
+{
+}
+
+int
+mono_gc_get_suspend_signal (void)
+{
+#ifdef USE_INCLUDED_GC
+ return GC_get_suspend_signal ();
+#else
+ return -1;
+#endif
+}
+
+#if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
+extern __thread MONO_TLS_FAST void* GC_thread_tls;
+#include "metadata-internals.h"
+
+static int
+shift_amount (int v)
+{
+ int i = 0;
+ while (!(v & (1 << i)))
+ i++;
+ return i;
+}
+
+enum {
+ ATYPE_FREEPTR,
+ ATYPE_FREEPTR_FOR_BOX,
+ ATYPE_NORMAL,
+ ATYPE_GCJ,
+ ATYPE_STRING,
+ ATYPE_NUM
+};
+
+static MonoMethod*
+create_allocator (int atype, int offset)
+{
+ int index_var, bytes_var, my_fl_var, my_entry_var;
+ guint32 no_freelist_branch, not_small_enough_branch = 0;
+ guint32 size_overflow_branch = 0;
+ MonoMethodBuilder *mb;
+ MonoMethod *res;
+ MonoMethodSignature *csig;
+ AllocatorWrapperInfo *info;
+
+ if (atype == ATYPE_STRING) {
+ csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
+ csig->ret = &mono_defaults.string_class->byval_arg;
+ csig->params [0] = &mono_defaults.int_class->byval_arg;
+ csig->params [1] = &mono_defaults.int32_class->byval_arg;
+ } else {
+ csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
+ csig->ret = &mono_defaults.object_class->byval_arg;
+ csig->params [0] = &mono_defaults.int_class->byval_arg;
+ }
+ mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
+ bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
+ if (atype == ATYPE_STRING) {
+ /* a string alloator method takes the args: (vtable, len) */
+ /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
+ mono_mb_emit_ldarg (mb, 1);
+ mono_mb_emit_icon (mb, 1);
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_icon (mb, 1);
+ mono_mb_emit_byte (mb, MONO_CEE_SHL);
+ // sizeof (MonoString) might include padding
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_stloc (mb, bytes_var);
+ } else {
+ /* bytes = vtable->klass->instance_size */
+ mono_mb_emit_ldarg (mb, 0);
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ /* FIXME: assert instance_size stays a 4 byte integer */
+ mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
+ mono_mb_emit_stloc (mb, bytes_var);
+ }
+
+ /* this is needed for strings/arrays only as the other big types are never allocated with this method */
+ if (atype == ATYPE_STRING) {
+ /* check for size */
+ /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
+ mono_mb_emit_ldloc (mb, bytes_var);
+ mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
+ not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
+ /* check for overflow */
+ mono_mb_emit_ldloc (mb, bytes_var);
+ mono_mb_emit_icon (mb, sizeof (MonoString));
+ size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
+ }
+
+ /* int index = INDEX_FROM_BYTES(bytes); */
+ index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
+
+ mono_mb_emit_ldloc (mb, bytes_var);
+ mono_mb_emit_icon (mb, GRANULARITY - 1);
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
+ mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
+ mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
+ mono_mb_emit_byte (mb, MONO_CEE_SHL);
+ /* index var is already adjusted into bytes */
+ mono_mb_emit_stloc (mb, index_var);
+
+ my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
+ my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
+ /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
+ mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
+ mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
+ mono_mb_emit_i4 (mb, offset);
+ if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
+ else if (atype == ATYPE_NORMAL)
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
+ else if (atype == ATYPE_GCJ)
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
+ else
+ g_assert_not_reached ();
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_ldloc (mb, index_var);
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_stloc (mb, my_fl_var);
+
+ /* my_entry = *my_fl; */
+ mono_mb_emit_ldloc (mb, my_fl_var);
+ mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
+ mono_mb_emit_stloc (mb, my_entry_var);
+
+ /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_icon (mb, HBLKSIZE);
+ no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
+
+ /* ptr_t next = obj_link(my_entry); *my_fl = next; */
+ mono_mb_emit_ldloc (mb, my_fl_var);
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
+ mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
+
+ /* set the vtable and clear the words in the object */
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_ldarg (mb, 0);
+ mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
+
+ if (atype == ATYPE_FREEPTR) {
+ int start_var, end_var, start_loop;
+ /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
+ */
+ start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
+ end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_ldloc (mb, bytes_var);
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_stloc (mb, end_var);
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_stloc (mb, start_var);
+ /*
+ * do {
+ * *start++ = NULL;
+ * } while (start < end);
+ */
+ start_loop = mono_mb_get_label (mb);
+ mono_mb_emit_ldloc (mb, start_var);
+ mono_mb_emit_icon (mb, 0);
+ mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
+ mono_mb_emit_ldloc (mb, start_var);
+ mono_mb_emit_icon (mb, sizeof (gpointer));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_stloc (mb, start_var);
+
+ mono_mb_emit_ldloc (mb, start_var);
+ mono_mb_emit_ldloc (mb, end_var);
+ mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
+ mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
+ } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
+ /* need to clear just the sync pointer */
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_icon (mb, 0);
+ mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
+ }
+
+ if (atype == ATYPE_STRING) {
+ /* need to set length and clear the last char */
+ /* s->length = len; */
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_ldarg (mb, 1);
+ mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
+ /* s->chars [len] = 0; */
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_ldloc (mb, bytes_var);
+ mono_mb_emit_icon (mb, 2);
+ mono_mb_emit_byte (mb, MONO_CEE_SUB);
+ mono_mb_emit_byte (mb, MONO_CEE_ADD);
+ mono_mb_emit_icon (mb, 0);
+ mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
+ }
+
+ /* return my_entry; */
+ mono_mb_emit_ldloc (mb, my_entry_var);
+ mono_mb_emit_byte (mb, MONO_CEE_RET);
+
+ mono_mb_patch_short_branch (mb, no_freelist_branch);
+ if (not_small_enough_branch > 0)
+ mono_mb_patch_short_branch (mb, not_small_enough_branch);
+ if (size_overflow_branch > 0)
+ mono_mb_patch_short_branch (mb, size_overflow_branch);
+ /* the slow path: we just call back into the runtime */
+ if (atype == ATYPE_STRING) {
+ mono_mb_emit_ldarg (mb, 1);
+ mono_mb_emit_icall (mb, mono_string_alloc);
+ } else {
+ mono_mb_emit_ldarg (mb, 0);
+ mono_mb_emit_icall (mb, mono_object_new_specific);
+ }
+
+ mono_mb_emit_byte (mb, MONO_CEE_RET);
+
+ res = mono_mb_create_method (mb, csig, 8);
+ mono_mb_free (mb);
+ mono_method_get_header (res)->init_locals = FALSE;
+
+ info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
+ info->gc_name = "boehm";
+ info->alloc_type = atype;
+ mono_marshal_set_wrapper_info (res, info);
+
+ return res;
+}
+
+static MonoMethod* alloc_method_cache [ATYPE_NUM];
+
+/*
+ * If possible, generate a managed method that can quickly allocate objects in class
+ * @klass. The method will typically have an thread-local inline allocation sequence.
+ * The signature of the called method is:
+ * object allocate (MonoVTable *vtable)
+ * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
+ * keep in sync.
+ * The thread local alloc logic is taken from libgc/pthread_support.c.
+ */
+
+MonoMethod*
+mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
+{
+ int offset = -1;
+ int atype;
+ MonoClass *klass = vtable->klass;
+ MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
+
+ /*g_print ("thread tls: %d\n", offset);*/
+ if (offset == -1)
+ return NULL;
+ if (!SMALL_ENOUGH (klass->instance_size))
+ return NULL;
+ if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
+ return NULL;
+ if (klass->rank)
+ return NULL;
+ if (klass->byval_arg.type == MONO_TYPE_STRING) {
+ atype = ATYPE_STRING;
+ } else if (!klass->has_references) {
+ if (for_box)
+ atype = ATYPE_FREEPTR_FOR_BOX;
+ else
+ atype = ATYPE_FREEPTR;
+ } else {
+ return NULL;
+ /*
+ * disabled because we currently do a runtime choice anyway, to
+ * deal with multiple appdomains.
+ if (vtable->gc_descr != GC_NO_DESCRIPTOR)
+ atype = ATYPE_GCJ;
+ else
+ atype = ATYPE_NORMAL;
+ */
+ }
+ return mono_gc_get_managed_allocator_by_type (atype);
+}
+
+MonoMethod*
+mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
+{
+ return NULL;
+}
+
+/**
+ * mono_gc_get_managed_allocator_by_type:
+ *
+ * Return a managed allocator method corresponding to allocator type ATYPE.
+ */
+MonoMethod*
+mono_gc_get_managed_allocator_by_type (int atype)
+{
+ int offset = -1;
+ MonoMethod *res;
+ MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
+
+ mono_loader_lock ();
+ res = alloc_method_cache [atype];
+ if (!res)
+ res = alloc_method_cache [atype] = create_allocator (atype, offset);
+ mono_loader_unlock ();
+ return res;
+}
+
+guint32
+mono_gc_get_managed_allocator_types (void)
+{
+ return ATYPE_NUM;
+}
+
+MonoMethod*
+mono_gc_get_write_barrier (void)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+#else
+
+MonoMethod*
+mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
+{
+ return NULL;
+}
+
+MonoMethod*
+mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
+{
+ return NULL;
+}
+
+MonoMethod*
+mono_gc_get_managed_allocator_by_type (int atype)
+{
+ return NULL;
+}
+
+guint32
+mono_gc_get_managed_allocator_types (void)
+{
+ return 0;
+}
+
+MonoMethod*
+mono_gc_get_write_barrier (void)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+#endif
+
+const char *
+mono_gc_get_gc_name (void)
+{
+ return "boehm";
+}
+
+void*
+mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
+{
+ return GC_call_with_alloc_lock (func, data);
+}
+
+char*
+mono_gc_get_description (void)
+{
+ return g_strdup (DEFAULT_GC_NAME);
+}
+
+void
+mono_gc_set_desktop_mode (void)
+{
+ GC_dont_expand = 1;
+}
+
+gboolean
+mono_gc_is_moving (void)
+{
+ return FALSE;
+}
+
+gboolean
+mono_gc_is_disabled (void)
+{
+ if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
+ return TRUE;
+ else
+ return FALSE;
+}
+
+void
+mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
+{
+ g_assert_not_reached ();
+}
+
+
+guint8*
+mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+void*
+mono_gc_get_nursery (int *shift_bits, size_t *size)
+{
+ return NULL;
+}
+
+gboolean
+mono_gc_precise_stack_mark_enabled (void)
+{
+ return FALSE;
+}
+
+FILE *
+mono_gc_get_logfile (void)
+{
+ return NULL;
+}
+
+void
+mono_gc_conservatively_scan_area (void *start, void *end)
+{
+ g_assert_not_reached ();
+}
+
+void *
+mono_gc_scan_object (void *obj)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+gsize*
+mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
+{
+ g_assert_not_reached ();
+ return NULL;
+}
+
+void
+mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
+{
+}
+
+/*
+ * These will call the redefined versions in libgc.
+ */
+
+#ifndef HOST_WIN32
+
+int
+mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
+{
+ return pthread_create (new_thread, attr, start_routine, arg);
+}
+
+int
+mono_gc_pthread_join (pthread_t thread, void **retval)
+{
+ return pthread_join (thread, retval);
+}
+
+int
+mono_gc_pthread_detach (pthread_t thread)
+{
+ return pthread_detach (thread);
+}
+
+#endif
+
+#ifdef HOST_WIN32
+BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
+{
+#ifdef USE_INCLUDED_LIBGC
+ return GC_DllMain (module_handle, reason, reserved);
+#else
+ return TRUE;
+#endif
+}
+#endif
+
+#endif /* no Boehm GC */
projects / mono.git / blobdiff