/* Functions related to the Boehm garbage collector.
- Copyright (C) 2000 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2003, 2004, 2006 Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify
+GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
-GNU CC is distributed in the hope that it will be useful,
+GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>.
Java and all Java-based marks are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries.
#include <config.h>
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "tree.h"
#include "java-tree.h"
#include "parse.h"
#include "toplev.h"
-static void mark_reference_fields PARAMS ((tree,
- unsigned HOST_WIDE_INT *,
- unsigned HOST_WIDE_INT *,
- unsigned int,
- int *, int *,
- int *,
- HOST_WIDE_INT *));
-static void set_bit PARAMS ((unsigned HOST_WIDE_INT *,
- unsigned HOST_WIDE_INT *,
- unsigned int));
+static void mark_reference_fields (tree, unsigned HOST_WIDE_INT *,
+ unsigned HOST_WIDE_INT *, unsigned int,
+ int *, int *, int *, HOST_WIDE_INT *);
+static void set_bit (unsigned HOST_WIDE_INT *, unsigned HOST_WIDE_INT *,
+ unsigned int);
+
+/* A procedure-based object descriptor. We know that our
+ `kind' is 0, and `env' is likewise 0, so we have a simple
+ computation. From the GC sources:
+ (((((env) << LOG_MAX_MARK_PROCS) | (proc_index)) << DS_TAG_BITS) \
+ | DS_PROC)
+ Here DS_PROC == 2. */
+#define PROCEDURE_OBJECT_DESCRIPTOR 2
/* Treat two HOST_WIDE_INT's as a contiguous bitmap, with bit 0 being
the least significant. This function sets bit N in the bitmap. */
static void
-set_bit (low, high, n)
- unsigned HOST_WIDE_INT *low, *high;
- unsigned int n;
+set_bit (unsigned HOST_WIDE_INT *low, unsigned HOST_WIDE_INT *high,
+ unsigned int n)
{
- HOST_WIDE_INT *which;
+ unsigned HOST_WIDE_INT *which;
if (n >= HOST_BITS_PER_WIDE_INT)
{
else
which = low;
- *which |= (HOST_WIDE_INT) 1 << n;
+ *which |= (unsigned HOST_WIDE_INT) 1 << n;
}
/* Recursively mark reference fields. */
static void
-mark_reference_fields (field, low, high, ubit,
- pointer_after_end, all_bits_set,
- last_set_index, last_view_index)
- tree field;
- unsigned HOST_WIDE_INT *low, *high;
- unsigned int ubit;
- int *pointer_after_end, *all_bits_set;
- int *last_set_index;
- HOST_WIDE_INT *last_view_index;
+mark_reference_fields (tree field,
+ unsigned HOST_WIDE_INT *low,
+ unsigned HOST_WIDE_INT *high,
+ unsigned int ubit,
+ int *pointer_after_end,
+ int *all_bits_set,
+ int *last_set_index,
+ HOST_WIDE_INT *last_view_index)
{
/* See if we have fields from our superclass. */
if (DECL_NAME (field) == NULL_TREE)
/* If this reference slot appears to overlay a slot we think
we already covered, then we are doomed. */
- if (offset <= *last_view_index)
- abort ();
+ gcc_assert (offset > *last_view_index);
count = offset * BITS_PER_UNIT / POINTER_SIZE;
size_words = size_bytes * BITS_PER_UNIT / POINTER_SIZE;
HOST_WIDE_INT last_view_index = -1;
int pointer_after_end = 0;
unsigned HOST_WIDE_INT low = 0, high = 0;
- tree field, value;
+ tree field, value, value_type;
/* If the GC wasn't requested, just use a null pointer. */
if (! flag_use_boehm_gc)
return null_pointer_node;
+ value_type = java_type_for_mode (ptr_mode, 1);
/* If we have a type of unknown size, use a proc. */
if (int_size_in_bytes (type) == -1)
goto procedure_object_descriptor;
/* If the object is all pointers, or if the part with pointers fits
in our bitmap, then we are ok. Otherwise we have to allocate it
a different way. */
- if (all_bits_set != -1)
+ if (all_bits_set != -1 || (pointer_after_end && flag_reduced_reflection))
{
/* In this case the initial part of the object is all reference
fields, and the end of the object is all non-reference
this:
value = DS_LENGTH | WORDS_TO_BYTES (last_set_index + 1);
DS_LENGTH is 0.
- WORDS_TO_BYTES shifts by log2(bytes-per-pointer). */
+ WORDS_TO_BYTES shifts by log2(bytes-per-pointer).
+
+ In the case of flag_reduced_reflection and the bitmap would
+ overflow, we tell the gc that the object is all pointers so
+ that we don't have to emit reflection data for run time
+ marking. */
count = 0;
low = 0;
high = 0;
last_set_index >>= 1;
++count;
}
- value = build_int_2 (low, high);
+ value = build_int_cst_wide (value_type, low, high);
}
else if (! pointer_after_end)
{
/* Bottom two bits for bitmap mark type are 01. */
set_bit (&low, &high, 0);
- value = build_int_2 (low, high);
+ value = build_int_cst_wide (value_type, low, high);
}
else
{
- /* Compute a procedure-based object descriptor. We know that our
- `kind' is 0, and `env' is likewise 0, so we have a simple
- computation. From the GC sources:
- (((((env) << LOG_MAX_MARK_PROCS) | (proc_index)) << DS_TAG_BITS) \
- | DS_PROC)
- Here DS_PROC == 2. */
procedure_object_descriptor:
- value = build_int_2 (2, 0);
+ value = build_int_cst (value_type, PROCEDURE_OBJECT_DESCRIPTOR);
}
- TREE_TYPE (value) = java_type_for_mode (ptr_mode, 1);
return value;
}
+
+/* The fourth (index of 3) element in the vtable is the GC descriptor.
+ A value of 2 indicates that the class uses _Jv_MarkObj. */
+bool
+uses_jv_markobj_p (tree dtable)
+{
+ tree v;
+ /* FIXME: what do we return if !flag_use_boehm_gc ? */
+ gcc_assert (flag_use_boehm_gc);
+ /* FIXME: this is wrong if TARGET_VTABLE_USES_DESCRIPTORS. However,
+ this function is only used with flag_reduced_reflection. No
+ point in asserting unless we hit the bad case. */
+ gcc_assert (!flag_reduced_reflection || TARGET_VTABLE_USES_DESCRIPTORS == 0);
+ v = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (dtable), 3)->value;
+ return (PROCEDURE_OBJECT_DESCRIPTOR == TREE_INT_CST_LOW (v));
+}
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