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, 76 insertions, 0 deletions

diff --git a/lib/libdwarf/dwarf_errmsg.c b/lib/libdwarf/dwarf_errmsg.c
new file mode 100644
index 0000000..ffc2020
--- /dev/null
+++ b/lib/libdwarf/dwarf_errmsg.c
@@ -0,0 +1,76 @@
+/*-
+ * 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 <stdio.h>
+#include "_libdwarf.h"
+
+const char *_libdwarf_errors[] = {
+#define	DEFINE_ERROR(N,S)		[DWARF_E_##N] = S
+	DEFINE_ERROR(NONE,		"No Error"),
+	DEFINE_ERROR(ERROR,		"An error"),
+	DEFINE_ERROR(NO_ENTRY,		"No entry found"),
+	DEFINE_ERROR(ARGUMENT,		"Invalid argument"),
+	DEFINE_ERROR(DEBUG_INFO,	"Debug info NULL"),
+	DEFINE_ERROR(MEMORY,		"Insufficient memory"),
+	DEFINE_ERROR(ELF,		"ELF error"),
+	DEFINE_ERROR(INVALID_CU,	"Invalid compilation unit data"),
+	DEFINE_ERROR(CU_VERSION,	"Wrong CU version. Only 2 and 3 supported"),
+	DEFINE_ERROR(MISSING_ABBREV,	"Abbrev not found"),
+	DEFINE_ERROR(NOT_IMPLEMENTED,	"Unimplemented code at"),
+	DEFINE_ERROR(CU_CURRENT,	"No current compilation unit"),
+	DEFINE_ERROR(BAD_FORM,		"Wrong form type for attribute value"),
+	DEFINE_ERROR(INVALID_EXPR,	"Invalid DWARF expression"),
+	DEFINE_ERROR(NUM,		"Unknown DWARF error")
+#undef	DEFINE_ERROR
+};
+
+const char *
+dwarf_errmsg(Dwarf_Error *error)
+{
+	const char *p;
+
+	if (error == NULL)
+		return NULL;
+
+	if (error->err_error < 0 || error->err_error >= DWARF_E_NUM)
+		return _libdwarf_errors[DWARF_E_NUM];
+	else if (error->err_error == DWARF_E_NONE)
+		return _libdwarf_errors[DWARF_E_NONE];
+	else
+		p = _libdwarf_errors[error->err_error];
+
+	if (error->err_error == DWARF_E_ELF)
+		snprintf(error->err_msg, sizeof(error->err_msg),
+		    "ELF error : %s [%s(%d)]", elf_errmsg(error->elf_error),
+		    error->err_func, error->err_line);
+	else
+		snprintf(error->err_msg, sizeof(error->err_msg),
+		    "%s [%s(%d)]", p, error->err_func, error->err_line);
+
+	return (const char *) error->err_msg;
+}