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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 2021 Jason King
* Copyright 2019, Joyent, Inc.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <sys/ctype.h>
#include <sys/debug.h>
#include <sys/sysmacros.h>
#include <stdarg.h>
#include "demangle-sys.h"
#include "demangle_int.h"
#include "strview.h"
#define DEMANGLE_DEBUG "DEMANGLE_DEBUG"
static pthread_once_t debug_once = PTHREAD_ONCE_INIT;
volatile boolean_t demangle_debug;
FILE *debugf = stderr;
static struct {
const char *str;
sysdem_lang_t lang;
} lang_tbl[] = {
{ "auto", SYSDEM_LANG_AUTO },
{ "c++", SYSDEM_LANG_CPP },
{ "rust", SYSDEM_LANG_RUST },
};
static const char *
langstr(sysdem_lang_t lang)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(lang_tbl); i++) {
if (lang == lang_tbl[i].lang)
return (lang_tbl[i].str);
}
return ("invalid");
}
boolean_t
sysdem_parse_lang(const char *str, sysdem_lang_t *langp)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(lang_tbl); i++) {
if (strcmp(str, lang_tbl[i].str) == 0) {
*langp = lang_tbl[i].lang;
return (B_TRUE);
}
}
return (B_FALSE);
}
/*
* A quick check if str can possibly be a mangled string. Currently, that
* means it must start with _Z or __Z.
*/
static boolean_t
is_mangled(const char *str, size_t n)
{
strview_t sv;
sv_init_str(&sv, str, str + n);
if (!sv_consume_if_c(&sv, '_'))
return (B_FALSE);
(void) sv_consume_if_c(&sv, '_');
if (sv_consume_if_c(&sv, 'Z'))
return (B_TRUE);
return (B_FALSE);
}
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)
{
char *res = NULL;
/*
* 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 we were given an explicit language to demangle, we always
* use that. If not, we try to demangle as rust, then c++. Any
* mangled C++ symbol that manages to successfully demangle as a
* legacy rust symbol _should_ look the same as it can really
* only be a very simple C++ symbol. Otherwise, the rust demangling
* should fail and we can try C++.
*/
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:
break;
}
/*
* To save us some potential work, if the symbol cannot
* possibly be a rust or C++ mangled name, we don't
* even attempt to demangle either.
*/
if (!is_mangled(str, slen)) {
/*
* This does mean if we somehow get a string > 2GB
* the debugging output will be truncated, but that
* seems an acceptable tradeoff.
*/
int len = slen > INT_MAX ? INT_MAX : slen;
DEMDEBUG("ERROR: '%.*s' cannot be a mangled string", len, str);
errno = EINVAL;
return (NULL);
}
DEMDEBUG("trying rust");
res = rust_demangle(str, slen, ops);
IMPLY(ret != NULL, errno == 0);
if (res != NULL)
return (res);
DEMDEBUG("trying C++");
return (cpp_demangle(str, slen, ops));
}
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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