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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __UNWIND_H
#define __UNWIND_H
#include <stdint.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include "map_symbol.h"
struct maps;
struct option;
struct perf_sample;
struct thread;
struct unwind_entry {
struct map_symbol ms;
u64 ip;
};
typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
int unwind__configure(const char *var, const char *value, void *cb);
int unwind__option(const struct option *opt, const char *arg, int unset);
/*
* When best_effort is set, don't report errors and fail silently. This could
* be expanded in the future to be more permissive about things other than
* error messages.
*/
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
struct thread *thread,
struct perf_sample *data, int max_stack,
bool best_effort);
#ifdef HAVE_LIBDW_SUPPORT
int libdw__get_entries(unwind_entry_cb_t cb, void *arg,
struct thread *thread,
struct perf_sample *data, int max_stack,
bool best_effort);
#else
#include "debug.h"
static inline int libdw__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)
{
pr_warning_once("Error: libdw dwarf unwinding not built into perf\n");
return 0;
}
#endif
#ifdef HAVE_LIBUNWIND_SUPPORT
/* libunwind specific */
int libunwind__get_entries(unwind_entry_cb_t cb, void *arg,
struct thread *thread,
struct perf_sample *data, int max_stack,
bool best_effort);
int unwind__prepare_access(struct maps *maps, uint16_t e_machine);
void unwind__flush_access(struct maps *maps);
void unwind__finish_access(struct maps *maps);
#else
#include "debug.h"
static inline int libunwind__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)
{
pr_warning_once("Error: libunwind dwarf unwinding not built into perf\n");
return 0;
}
static inline int unwind__prepare_access(struct maps *maps __maybe_unused,
uint16_t e_machine __maybe_unused)
{
return 0;
}
static inline void unwind__flush_access(struct maps *maps __maybe_unused) {}
static inline void unwind__finish_access(struct maps *maps __maybe_unused) {}
#endif
#endif /* __UNWIND_H */
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