Vendor import of the CTF (Compact C Type Format) code used by DTrace

from OpenSolaris.

1 files changed, 62 insertions, 0 deletions

diff --git a/tools/ctf/common/symbol.c b/tools/ctf/common/symbol.c
new file mode 100644
index 000000000000..29796acb2c61
--- /dev/null
+++ b/tools/ctf/common/symbol.c
@@ -0,0 +1,62 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+#include <string.h>
+
+#include "symbol.h"
+
+int
+ignore_symbol(GElf_Sym *sym, const char *name)
+{
+	uchar_t type = GELF_ST_TYPE(sym->st_info);
+
+	/*
+	 * As an optimization, we do not output function or data object
+	 * records for undefined or anonymous symbols.
+	 */
+	if (sym->st_shndx == SHN_UNDEF || sym->st_name == 0)
+		return (1);
+
+	/*
+	 * _START_ and _END_ are added to the symbol table by the
+	 * linker, and will never have associated type information.
+	 */
+	if (strcmp(name, "_START_") == 0 || strcmp(name, "_END_") == 0)
+		return (1);
+
+	/*
+	 * Do not output records for absolute-valued object symbols
+	 * that have value zero.  The compiler insists on generating
+	 * things like this for __fsr_init_value settings, etc.
+	 */
+	if (type == STT_OBJECT && sym->st_shndx == SHN_ABS &&
+	    sym->st_value == 0)
+		return (1);
+	return (0);
+}