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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Jason King
* Copyright 2019, Joyent, Inc.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <sys/ctype.h>
#include <sys/debug.h>
#include <stdarg.h>
#include "demangle-sys.h"
#include "demangle_int.h"
#define DEMANGLE_DEBUG "DEMANGLE_DEBUG"
static pthread_once_t debug_once = PTHREAD_ONCE_INIT;
volatile boolean_t demangle_debug;
FILE *debugf = stderr;
static const char *
langstr(sysdem_lang_t lang)
{
switch (lang) {
case SYSDEM_LANG_AUTO:
return ("auto");
case SYSDEM_LANG_CPP:
return ("c++");
case SYSDEM_LANG_RUST:
return ("rust");
default:
return ("invalid");
}
}
static sysdem_lang_t
detect_lang(const char *str, size_t n)
{
const char *p = str;
size_t len;
if (n < 3 || str[0] != '_')
return (SYSDEM_LANG_AUTO);
/*
* Check for ^_Z or ^__Z
*/
p = str + 1;
if (*p == '_') {
p++;
}
if (*p != 'Z')
return (SYSDEM_LANG_AUTO);
/*
* Sadly, rust currently uses the same prefix as C++, however
* demangling rust as a C++ mangled name yields less than desirable
* results. However rust names end with a hash. We use that to
* attempt to disambiguate
*/
/* Find 'h'<hexdigit>+E$ */
if ((p = strrchr(p, 'h')) == NULL)
return (SYSDEM_LANG_CPP);
if ((len = strspn(p + 1, "0123456789abcdef")) == 0)
return (SYSDEM_LANG_CPP);
p += len + 1;
if (p[0] != 'E' || p[1] != '\0')
return (SYSDEM_LANG_CPP);
return (SYSDEM_LANG_RUST);
}
static void
check_debug(void)
{
if (getenv(DEMANGLE_DEBUG))
demangle_debug = B_TRUE;
}
char *
sysdemangle(const char *str, sysdem_lang_t lang, sysdem_ops_t *ops)
{
/*
* While the language specific demangler code can handle non-NUL
* terminated strings, we currently don't expose this to consumers.
* Consumers should still pass in a NUL-terminated string.
*/
size_t slen;
VERIFY0(pthread_once(&debug_once, check_debug));
DEMDEBUG("name = '%s'", (str == NULL) ? "(NULL)" : str);
DEMDEBUG("lang = %s (%d)", langstr(lang), lang);
if (str == NULL) {
errno = EINVAL;
return (NULL);
}
slen = strlen(str);
switch (lang) {
case SYSDEM_LANG_AUTO:
case SYSDEM_LANG_CPP:
case SYSDEM_LANG_RUST:
break;
default:
errno = EINVAL;
return (NULL);
}
if (ops == NULL)
ops = sysdem_ops_default;
if (lang == SYSDEM_LANG_AUTO) {
lang = detect_lang(str, slen);
if (lang != SYSDEM_LANG_AUTO)
DEMDEBUG("detected language is %s", langstr(lang));
}
switch (lang) {
case SYSDEM_LANG_CPP:
return (cpp_demangle(str, slen, ops));
case SYSDEM_LANG_RUST:
return (rust_demangle(str, slen, ops));
case SYSDEM_LANG_AUTO:
DEMDEBUG("could not detect language");
errno = ENOTSUP;
return (NULL);
default:
/*
* This can't happen unless there's a bug with detect_lang,
* but gcc doesn't know that.
*/
errno = EINVAL;
return (NULL);
}
}
int
demdebug(const char *fmt, ...)
{
va_list ap;
flockfile(debugf);
(void) fprintf(debugf, "LIBDEMANGLE: ");
va_start(ap, fmt);
(void) vfprintf(debugf, fmt, ap);
(void) fputc('\n', debugf);
(void) fflush(debugf);
va_end(ap);
funlockfile(debugf);
return (0);
}
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