Add a BSD licensed DWARF library for use by the DTrace clients.

The API for this library is deliberately different to the GPL'd
libdwarf to avoid licensing problems.

1 files changed, 92 insertions, 0 deletions

diff --git a/lib/libdwarf/dwarf_attr.c b/lib/libdwarf/dwarf_attr.c
new file mode 100644
index 0000000..3c9d4c8
--- /dev/null
+++ b/lib/libdwarf/dwarf_attr.c
@@ -0,0 +1,92 @@
+/*-
+ * Copyright (c) 2007 John Birrell (jb@freebsd.org)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "_libdwarf.h"
+
+int
+dwarf_attr(Dwarf_Die die, Dwarf_Half attr, Dwarf_Attribute *atp, Dwarf_Error *err)
+{
+	Dwarf_Attribute at;
+	Dwarf_Abbrev	a;
+	int ret = DWARF_E_NONE;
+
+	if (err == NULL)
+		return DWARF_E_ERROR;
+
+	if (die == NULL || atp == NULL || (a = die->die_a) == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
+		return DWARF_E_ARGUMENT;
+	}
+
+	STAILQ_FOREACH(at, &a->a_attrib, at_next)
+		if (at->at_attrib == attr)
+			break;
+
+	*atp = at;
+
+	if (at == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
+		ret = DWARF_E_NO_ENTRY;
+	}
+
+	return ret;
+}
+
+int
+dwarf_attr_add(Dwarf_Abbrev a, uint64_t attr, uint64_t form, Dwarf_Attribute *atp, Dwarf_Error *error)
+{
+	Dwarf_Attribute at;
+	int ret = DWARF_E_NONE;
+
+	if (error == NULL)
+		return DWARF_E_ERROR;
+
+	if (a == NULL) {
+		DWARF_SET_ERROR(error, DWARF_E_ARGUMENT);
+		return DWARF_E_ARGUMENT;
+	}
+
+	if ((at = malloc(sizeof(struct _Dwarf_Attribute))) == NULL) {
+		DWARF_SET_ERROR(error, DWARF_E_MEMORY);
+		return DWARF_E_MEMORY;
+	}
+
+	/* Initialise the attribute structure. */
+	at->at_attrib	= attr;
+	at->at_form	= form;
+
+	/* Add the attribute to the list in the abbrev. */
+	STAILQ_INSERT_TAIL(&a->a_attrib, at, at_next);
+
+	if (atp != NULL)
+		*atp = at;
+
+	return ret;
+}