vendor/elftoolchain/elftoolchain-r2974

1 files changed, 335 insertions, 0 deletions

diff --git a/libdwarf/dwarf_die.c b/libdwarf/dwarf_die.c
new file mode 100644
index 000000000000..b2b38403005f
--- /dev/null
+++ b/libdwarf/dwarf_die.c
@@ -0,0 +1,335 @@
+/*-
+ * Copyright (c) 2007 John Birrell (jb@freebsd.org)
+ * Copyright (c) 2009,2011 Kai Wang
+ * 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.
+ */
+
+#include "_libdwarf.h"
+
+ELFTC_VCSID("$Id: dwarf_die.c 2073 2011-10-27 03:30:47Z jkoshy $");
+
+int
+dwarf_child(Dwarf_Die die, Dwarf_Die *ret_die, Dwarf_Error *error)
+{
+	Dwarf_Debug dbg;
+	Dwarf_CU cu;
+	int ret;
+
+	dbg = die != NULL ? die->die_dbg : NULL;
+
+	if (die == NULL || ret_die == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	if (die->die_ab->ab_children == DW_CHILDREN_no)
+		return (DW_DLE_NO_ENTRY);
+
+	dbg = die->die_dbg;
+	cu = die->die_cu;
+	ret = _dwarf_die_parse(die->die_dbg, dbg->dbg_info_sec, cu,
+	    cu->cu_dwarf_size, die->die_next_off, cu->cu_next_offset,
+	    ret_die, 0, error);
+
+	if (ret == DW_DLE_NO_ENTRY) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+		return (DW_DLV_NO_ENTRY);
+	} else if (ret != DW_DLE_NONE)
+		return (DW_DLV_ERROR);
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_siblingof(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Die *ret_die,
+    Dwarf_Error *error)
+{
+	Dwarf_CU cu;
+	Dwarf_Attribute at;
+	uint64_t offset;
+	int ret, search_sibling;
+
+	if (dbg == NULL || ret_die == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	if ((cu = dbg->dbg_cu_current) == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_DIE_NO_CU_CONTEXT);
+		return (DW_DLV_ERROR);
+	}
+
+	/* Application requests the first DIE in this CU. */
+	if (die == NULL)
+		return (dwarf_offdie(dbg, cu->cu_1st_offset, ret_die,
+		    error));
+
+	/*
+	 * If the DIE doesn't have any children, its sibling sits next
+	 * right to it.
+	 */
+	search_sibling = 0;
+	if (die->die_ab->ab_children == DW_CHILDREN_no)
+		offset = die->die_next_off;
+	else {
+		/*
+		 * Look for DW_AT_sibling attribute for the offset of
+		 * its sibling.
+		 */
+		if ((at = _dwarf_attr_find(die, DW_AT_sibling)) != NULL) {
+			if (at->at_form != DW_FORM_ref_addr)
+				offset = at->u[0].u64 + cu->cu_offset;
+			else
+				offset = at->u[0].u64;
+		} else {
+			offset = die->die_next_off;
+			search_sibling = 1;
+		}
+	}
+
+	ret = _dwarf_die_parse(die->die_dbg, dbg->dbg_info_sec, cu,
+	    cu->cu_dwarf_size, offset, cu->cu_next_offset, ret_die,
+	    search_sibling, error);
+	
+	if (ret == DW_DLE_NO_ENTRY) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+		return (DW_DLV_NO_ENTRY);
+	} else if (ret != DW_DLE_NONE)
+		return (DW_DLV_ERROR);
+
+	return (DW_DLV_OK);
+}
+
+static int
+_dwarf_search_die_within_cu(Dwarf_Debug dbg, Dwarf_CU cu, Dwarf_Off offset,
+    Dwarf_Die *ret_die, Dwarf_Error *error)
+{
+
+	assert(dbg != NULL && cu != NULL && ret_die != NULL);
+
+	return (_dwarf_die_parse(dbg, dbg->dbg_info_sec, cu, cu->cu_dwarf_size,
+	    offset, cu->cu_next_offset, ret_die, 0, error));
+}
+
+int
+dwarf_offdie(Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Die *ret_die,
+    Dwarf_Error *error)
+{
+	Dwarf_CU cu;
+	int ret;
+
+	if (dbg == NULL || ret_die == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	/* First search the current CU. */
+	if (dbg->dbg_cu_current != NULL) {
+		cu = dbg->dbg_cu_current;
+		if (offset > cu->cu_offset && offset < cu->cu_next_offset) {
+			ret = _dwarf_search_die_within_cu(dbg, cu, offset,
+			    ret_die, error);
+			if (ret == DW_DLE_NO_ENTRY) {
+				DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+				return (DW_DLV_NO_ENTRY);
+			} else if (ret != DW_DLE_NONE)
+				return (DW_DLV_ERROR);
+			return (DW_DLV_OK);
+		}
+	}
+
+	/* Search other CUs. */
+	ret = _dwarf_info_load(dbg, 1, error);
+	if (ret != DW_DLE_NONE)
+		return (DW_DLV_ERROR);
+
+	STAILQ_FOREACH(cu, &dbg->dbg_cu, cu_next) {
+		if (offset < cu->cu_offset || offset > cu->cu_next_offset)
+			continue;
+		ret = _dwarf_search_die_within_cu(dbg, cu, offset,
+		    ret_die, error);
+		if (ret == DW_DLE_NO_ENTRY) {
+			DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+			return (DW_DLV_NO_ENTRY);
+		} else if (ret != DW_DLE_NONE)
+			return (DW_DLV_ERROR);
+		return (DW_DLV_OK);
+	}
+
+	DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+	return (DW_DLV_NO_ENTRY);
+}
+
+int
+dwarf_tag(Dwarf_Die die, Dwarf_Half *tag, Dwarf_Error *error)
+{
+	Dwarf_Debug dbg;
+
+	dbg = die != NULL ? die->die_dbg : NULL;
+
+	if (die == NULL || tag == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	assert(die->die_ab != NULL);
+
+	*tag = (Dwarf_Half) die->die_ab->ab_tag;
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_dieoffset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *error)
+{
+	Dwarf_Debug dbg;
+
+	dbg = die != NULL ? die->die_dbg : NULL;
+
+	if (die == NULL || ret_offset == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	*ret_offset = die->die_offset;
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_die_CU_offset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *error)
+{
+	Dwarf_Debug dbg;
+	Dwarf_CU cu;
+
+	dbg = die != NULL ? die->die_dbg : NULL;
+
+	if (die == NULL || ret_offset == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	cu = die->die_cu;
+	assert(cu != NULL);
+
+	*ret_offset = die->die_offset - cu->cu_offset;
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_die_CU_offset_range(Dwarf_Die die, Dwarf_Off *cu_offset,
+    Dwarf_Off *cu_length, Dwarf_Error *error)
+{
+	Dwarf_Debug dbg;
+	Dwarf_CU cu;
+
+	dbg = die != NULL ? die->die_dbg : NULL;
+
+	if (die == NULL || cu_offset == NULL || cu_length == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	cu = die->die_cu;
+	assert(cu != NULL);
+
+	*cu_offset = cu->cu_offset;
+	*cu_length = cu->cu_length + cu->cu_length_size;
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_diename(Dwarf_Die die, char **ret_name, Dwarf_Error *error)
+{
+	Dwarf_Debug dbg;
+
+	dbg = die != NULL ? die->die_dbg : NULL;
+
+	if (die == NULL || ret_name == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	if (die->die_name == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+		return (DW_DLV_NO_ENTRY);
+	}
+
+	*ret_name = die->die_name;
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_die_abbrev_code(Dwarf_Die die)
+{
+
+	assert(die != NULL);
+
+	return (die->die_abnum);
+}
+
+int
+dwarf_get_cu_die_offset_given_cu_header_offset(Dwarf_Debug dbg,
+    Dwarf_Off in_cu_header_offset, Dwarf_Off *out_cu_die_offset,
+    Dwarf_Error *error)
+{
+	Dwarf_CU cu;
+
+	if (dbg == NULL || out_cu_die_offset == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	STAILQ_FOREACH(cu, &dbg->dbg_cu, cu_next) {
+		if (cu->cu_offset == in_cu_header_offset) {
+			*out_cu_die_offset = cu->cu_1st_offset;
+			break;
+		}
+	}
+
+	if (cu == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
+		return (DW_DLV_NO_ENTRY);
+	}
+
+	return (DW_DLV_OK);
+}
+
+int
+dwarf_get_address_size(Dwarf_Debug dbg, Dwarf_Half *addr_size,
+    Dwarf_Error *error)
+{
+
+	if (dbg == NULL || addr_size == NULL) {
+		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
+		return (DW_DLV_ERROR);
+	}
+
+	*addr_size = dbg->dbg_pointer_size;
+
+	return (DW_DLV_OK);
+}