1 files changed, 102 insertions, 0 deletions
diff --git a/erts/emulator/beam/beam_catches.c b/erts/emulator/beam/beam_catches.c
new file mode 100644
index 0000000000..d5cef1cad2
--- /dev/null
+++ b/erts/emulator/beam/beam_catches.c
@@ -0,0 +1,102 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2000-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "sys.h"
+#include "beam_catches.h"
+
+/* XXX: should use dynamic reallocation */
+#define TABSIZ (16*1024)
+static struct {
+    Eterm *cp;
+    unsigned cdr;
+} beam_catches[TABSIZ];
+
+static int free_list;
+static unsigned high_mark;
+
+void beam_catches_init(void)
+{
+    free_list = -1;
+    high_mark = 0;
+}
+
+unsigned beam_catches_cons(Eterm *cp, unsigned cdr)
+{
+    int i;
+
+    /*
+     * Allocate from free_list while it is non-empty.
+     * If free_list is empty, allocate at high_mark.
+     *
+     * This avoids the need to initialise the free list in
+     * beam_catches_init(), which would cost O(TABSIZ) time.
+     */
+    if( (i = free_list) >= 0 ) {
+	free_list = beam_catches[i].cdr;
+    } else if( (i = high_mark) < TABSIZ ) {
+	high_mark = i + 1;
+    } else {
+	fprintf(stderr, "beam_catches_cons: no free slots :-(\r\n");
+	exit(1);
+    }
+
+    beam_catches[i].cp = cp;
+    beam_catches[i].cdr = cdr;
+
+    return i;
+}
+
+Eterm *beam_catches_car(unsigned i)
+{
+    if( i >= TABSIZ ) {
+	fprintf(stderr,
+		"beam_catches_car: index %#x is out of range\r\n", i);
+	abort();
+    }
+    return beam_catches[i].cp;
+}
+
+void beam_catches_delmod(unsigned head, Eterm *code, unsigned code_bytes)
+{
+    unsigned i, cdr;
+
+    for(i = head; i != (unsigned)-1;) {
+	if( i >= TABSIZ ) {
+	    fprintf(stderr,
+		    "beam_catches_delmod: index %#x is out of range\r\n", i);
+	    abort();
+	}
+	if( (char*)beam_catches[i].cp - (char*)code >= code_bytes ) {
+	    fprintf(stderr,
+		    "beam_catches_delmod: item %#x has cp %#lx which is not "
+		    "in module's range [%#lx,%#lx[\r\n",
+		    i, (long)beam_catches[i].cp,
+		    (long)code, (long)((char*)code + code_bytes));
+	    abort();
+	}
+	beam_catches[i].cp = 0;
+	cdr = beam_catches[i].cdr;
+	beam_catches[i].cdr = free_list;
+	free_list = i;
+	i = cdr;
+    }
+}