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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _BACKTRACE_H
#define _BACKTRACE_H
#include <sys/types.h>
#include <stdbool.h>
#include <inttypes.h>
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_BACKTRACE_FRAMES 64
typedef struct backtrace_map_info {
struct backtrace_map_info* next;
uintptr_t start;
uintptr_t end;
bool is_readable;
bool is_writable;
bool is_executable;
char name[];
} backtrace_map_info_t;
typedef struct {
uintptr_t pc; /* The absolute pc. */
uintptr_t sp; /* The top of the stack. */
size_t stack_size; /* The size of the stack, zero indicate an unknown stack size. */
const char* map_name; /* The name of the map to which this pc belongs, NULL indicates the pc doesn't belong to a known map. */
uintptr_t map_offset; /* pc relative to the start of the map, only valid if map_name is not NULL. */
char* proc_name; /* The function name associated with this pc, NULL if no not found. */
uintptr_t proc_offset; /* pc relative to the start of the procedure, only valid if proc_name is not NULL. */
} backtrace_frame_data_t;
typedef struct {
backtrace_frame_data_t frames[MAX_BACKTRACE_FRAMES];
size_t num_frames;
pid_t tid;
backtrace_map_info_t* map_info_list;
void* private_data;
} backtrace_t;
/* Gather the backtrace data for tid and fill in the backtrace structure.
* If tid < 0, then gather the backtrace for the current thread.
*/
bool backtrace_get_data(backtrace_t* backtrace, pid_t tid);
/* Free any memory associated with the backtrace structure. */
void backtrace_free_data(backtrace_t* backtrace);
/* Read data at a specific address for a process. */
bool backtrace_read_word(
const backtrace_t* backtrace, uintptr_t ptr, uint32_t* value);
/* Get information about the map associated with a pc. If NULL is
* returned, then map_start is not set.
*/
const char* backtrace_get_map_info(
const backtrace_t* backtrace, uintptr_t pc, uintptr_t* map_start);
/* Get the procedure name and offest given the pc. If NULL is returned,
* then proc_offset is not set. The returned string is allocated using
* malloc and must be freed by the caller.
*/
char* backtrace_get_proc_name(
const backtrace_t* backtrace, uintptr_t pc, uintptr_t* proc_offset);
/* Loads memory map from /proc/<tid>/maps. If tid < 0, then load the memory
* map for the current process.
*/
backtrace_map_info_t* backtrace_create_map_info_list(pid_t tid);
/* Frees memory associated with the map list. */
void backtrace_destroy_map_info_list(backtrace_map_info_t* map_info_list);
/* Finds the memory map that contains the specified pc. */
const backtrace_map_info_t* backtrace_find_map_info(
const backtrace_map_info_t* map_info_list, uintptr_t pc);
/* Create a formatted line of backtrace information for a single frame. */
void backtrace_format_frame_data(
const backtrace_frame_data_t* frame, size_t frame_num, char *buf, size_t buf_size);
#ifdef __cplusplus
}
#endif
#endif /* _BACKTRACE_H */
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