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, 270 insertions, 0 deletions

diff --git a/lib/libdwarf/dwarf_attrval.c b/lib/libdwarf/dwarf_attrval.c
new file mode 100644
index 0000000..db07ee7
--- /dev/null
+++ b/lib/libdwarf/dwarf_attrval.c
@@ -0,0 +1,270 @@
+/*-
+ * 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 <unistd.h>
+#include "_libdwarf.h"
+
+Dwarf_AttrValue
+dwarf_attrval_find(Dwarf_Die die, Dwarf_Half attr)
+{
+	Dwarf_AttrValue av;
+
+	STAILQ_FOREACH(av, &die->die_attrval, av_next) {
+		if (av->av_attrib == attr)
+			break;
+	}
+
+	return av;
+}
+
+int
+dwarf_attrval_add(Dwarf_Die die, Dwarf_AttrValue avref, Dwarf_AttrValue *avp, Dwarf_Error *error)
+{
+	Dwarf_AttrValue av;
+	int ret = DWARF_E_NONE;
+
+	if ((av = malloc(sizeof(struct _Dwarf_AttrValue))) == NULL) {
+		DWARF_SET_ERROR(error, DWARF_E_MEMORY);
+		return DWARF_E_MEMORY;
+	}
+
+	memcpy(av, avref, sizeof(struct _Dwarf_AttrValue));
+
+	/* Add the attribute value to the list in the die. */
+	STAILQ_INSERT_TAIL(&die->die_attrval, av, av_next);
+
+	/* Save a pointer to the attribute name if this is one. */
+	if (av->av_attrib == DW_AT_name)
+		switch (av->av_form) {
+		case DW_FORM_strp:
+			die->die_name = av->u[1].s;
+			break;
+		case DW_FORM_string:
+			die->die_name = av->u[0].s;
+			break;
+		default:
+			break;
+		}
+
+	if (avp != NULL)
+		*avp = av;
+
+	return ret;
+}
+
+int
+dwarf_attrval_flag(Dwarf_Die die, uint64_t attr, Dwarf_Bool *valp, Dwarf_Error *err)
+{
+	Dwarf_AttrValue av;
+	int ret = DWARF_E_NONE;
+
+	if (err == NULL)
+		return DWARF_E_ERROR;
+
+	if (die == NULL || valp == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
+		return DWARF_E_ARGUMENT;
+	}
+
+	*valp = 0;
+
+	if ((av = dwarf_attrval_find(die, attr)) == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
+		ret = DWARF_E_NO_ENTRY;
+	} else {
+		switch (av->av_form) {
+		case DW_FORM_flag:
+			*valp = (Dwarf_Bool) av->u[0].u64;
+			break;
+		default:
+			printf("%s(%d): av->av_form '%s' (0x%lx) not handled\n",
+			    __func__,__LINE__,get_form_desc(av->av_form),
+			    (u_long) av->av_form);
+			DWARF_SET_ERROR(err, DWARF_E_BAD_FORM);
+			ret = DWARF_E_BAD_FORM;
+		}
+	}
+
+	return ret;
+}
+
+int
+dwarf_attrval_string(Dwarf_Die die, uint64_t attr, const char **strp, Dwarf_Error *err)
+{
+	Dwarf_AttrValue av;
+	int ret = DWARF_E_NONE;
+
+	if (err == NULL)
+		return DWARF_E_ERROR;
+
+	if (die == NULL || strp == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
+		return DWARF_E_ARGUMENT;
+	}
+
+	*strp = NULL;
+
+	if (attr == DW_AT_name)
+		*strp = die->die_name;
+	else if ((av = dwarf_attrval_find(die, attr)) == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
+		ret = DWARF_E_NO_ENTRY;
+	} else {
+		switch (av->av_form) {
+		case DW_FORM_strp:
+			*strp = av->u[1].s;
+			break;
+		case DW_FORM_string:
+			*strp = av->u[0].s;
+			break;
+		default:
+			printf("%s(%d): av->av_form '%s' (0x%lx) not handled\n",
+			    __func__,__LINE__,get_form_desc(av->av_form),
+			    (u_long) av->av_form);
+			DWARF_SET_ERROR(err, DWARF_E_BAD_FORM);
+			ret = DWARF_E_BAD_FORM;
+		}
+	}
+
+	return ret;
+}
+
+int
+dwarf_attrval_signed(Dwarf_Die die, uint64_t attr, Dwarf_Signed *valp, Dwarf_Error *err)
+{
+	Dwarf_AttrValue av;
+	int ret = DWARF_E_NONE;
+
+	if (err == NULL)
+		return DWARF_E_ERROR;
+
+	if (die == NULL || valp == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
+		return DWARF_E_ARGUMENT;
+	}
+
+	*valp = 0;
+
+	if ((av = dwarf_attrval_find(die, attr)) == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
+		ret = DWARF_E_NO_ENTRY;
+	} else {
+		switch (av->av_form) {
+		case DW_FORM_data1:
+		case DW_FORM_sdata:
+			*valp = av->u[0].s64;
+			break;
+		default:
+			printf("%s(%d): av->av_form '%s' (0x%lx) not handled\n",
+			    __func__,__LINE__,get_form_desc(av->av_form),
+			    (u_long) av->av_form);
+			DWARF_SET_ERROR(err, DWARF_E_BAD_FORM);
+			ret = DWARF_E_BAD_FORM;
+		}
+	}
+
+	return ret;
+}
+
+int
+dwarf_attrval_unsigned(Dwarf_Die die, uint64_t attr, Dwarf_Unsigned *valp, Dwarf_Error *err)
+{
+	Dwarf_AttrValue av;
+	int ret = DWARF_E_NONE;
+
+	if (err == NULL)
+		return DWARF_E_ERROR;
+
+	if (die == NULL || valp == NULL) {
+		DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
+		return DWARF_E_ARGUMENT;
+	}
+
+	*valp = 0;
+
+	if ((av = dwarf_attrval_find(die, attr)) == NULL && attr != DW_AT_type) {
+		DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
+		ret = DWARF_E_NO_ENTRY;
+	} else if (av == NULL && (av = dwarf_attrval_find(die,
+	    DW_AT_abstract_origin)) != NULL) {
+		Dwarf_Die die1;
+		Dwarf_Unsigned val;
+
+		switch (av->av_form) {
+		case DW_FORM_data1:
+		case DW_FORM_data2:
+		case DW_FORM_data4:
+		case DW_FORM_data8:
+		case DW_FORM_ref1:
+		case DW_FORM_ref2:
+		case DW_FORM_ref4:
+		case DW_FORM_ref8:
+		case DW_FORM_ref_udata:
+			val = av->u[0].u64;
+
+			if ((die1 = dwarf_die_find(die, val)) == NULL ||
+			    (av = dwarf_attrval_find(die1, attr)) == NULL) {
+				DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
+				ret = DWARF_E_NO_ENTRY;
+			}
+			break;
+		default:
+			printf("%s(%d): av->av_form '%s' (0x%lx) not handled\n",
+			    __func__,__LINE__,get_form_desc(av->av_form),
+			    (u_long) av->av_form);
+			DWARF_SET_ERROR(err, DWARF_E_BAD_FORM);
+			ret = DWARF_E_BAD_FORM;
+		}
+	}
+
+	if (ret == DWARF_E_NONE) {
+		switch (av->av_form) {
+		case DW_FORM_data1:
+		case DW_FORM_data2:
+		case DW_FORM_data4:
+		case DW_FORM_data8:
+		case DW_FORM_ref1:
+		case DW_FORM_ref2:
+		case DW_FORM_ref4:
+		case DW_FORM_ref8:
+		case DW_FORM_ref_udata:
+			*valp = av->u[0].u64;
+			break;
+		default:
+			printf("%s(%d): av->av_form '%s' (0x%lx) not handled\n",
+			    __func__,__LINE__,get_form_desc(av->av_form),
+			    (u_long) av->av_form);
+			DWARF_SET_ERROR(err, DWARF_E_BAD_FORM);
+			ret = DWARF_E_BAD_FORM;
+		}
+	}
+
+	return ret;
+}