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// SPDX-License-Identifier: GPL-2.0
#include "debug.h"
#include "symbol_conf.h"
#include "unwind.h"
#include <linux/string.h>
#include <string.h>
#include <stdlib.h>
int unwind__get_entries(unwind_entry_cb_t cb __maybe_unused, void *arg __maybe_unused,
struct thread *thread __maybe_unused,
struct perf_sample *data __maybe_unused,
int max_stack __maybe_unused,
bool best_effort __maybe_unused)
{
int ret = 0;
#if defined(HAVE_LIBDW_SUPPORT) || defined(HAVE_LIBUNWIND_SUPPORT)
if (symbol_conf.unwind_style[0] == UNWIND_STYLE_UNKNOWN) {
int i = 0;
#ifdef HAVE_LIBDW_SUPPORT
symbol_conf.unwind_style[i++] = UNWIND_STYLE_LIBDW;
#endif
#ifdef HAVE_LIBUNWIND_SUPPORT
symbol_conf.unwind_style[i++] = UNWIND_STYLE_LIBUNWIND;
#endif
}
#endif //defined(HAVE_LIBDW_SUPPORT) || defined(HAVE_LIBUNWIND_SUPPORT)
for (size_t i = 0; i < ARRAY_SIZE(symbol_conf.unwind_style); i++) {
switch (symbol_conf.unwind_style[i]) {
case UNWIND_STYLE_LIBDW:
ret = libdw__get_entries(cb, arg, thread, data, max_stack, best_effort);
break;
case UNWIND_STYLE_LIBUNWIND:
ret = libunwind__get_entries(cb, arg, thread, data, max_stack, best_effort);
break;
case UNWIND_STYLE_UNKNOWN:
default:
#if !defined(HAVE_LIBDW_SUPPORT) && !defined(HAVE_LIBUNWIND_SUPPORT)
pr_warning_once(
"Error: dwarf unwinding not supported, build perf with libdw or libunwind.\n");
#endif
ret = 0;
break;
}
if (ret > 0) {
ret = 0;
break;
}
if (ret < 0)
break;
}
return ret;
}
int unwind__configure(const char *var, const char *value, void *cb __maybe_unused)
{
static const char * const unwind_style_names[] = {
[UNWIND_STYLE_LIBDW] = "libdw",
[UNWIND_STYLE_LIBUNWIND] = "libunwind",
NULL
};
char *s, *p, *saveptr;
size_t i = 0;
if (strcmp(var, "unwind.style"))
return 0;
if (!value)
return -1;
s = strdup(value);
if (!s)
return -1;
memset(symbol_conf.unwind_style, 0, sizeof(symbol_conf.unwind_style));
p = strtok_r(s, ",", &saveptr);
while (p && i < ARRAY_SIZE(symbol_conf.unwind_style)) {
bool found = false;
char *q = strim(p);
for (size_t j = UNWIND_STYLE_LIBDW; j < MAX_UNWIND_STYLE; j++) {
if (!strcasecmp(q, unwind_style_names[j])) {
symbol_conf.unwind_style[i++] = j;
found = true;
break;
}
}
if (!found)
pr_warning("Unknown unwind style: %s\n", q);
p = strtok_r(NULL, ",", &saveptr);
}
free(s);
return 0;
}
int unwind__option(const struct option *opt __maybe_unused,
const char *arg,
int unset __maybe_unused)
{
return unwind__configure("unwind.style", arg, NULL);
}
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