stacktrace.cc File Reference

#include "my_config.h"
#include <fcntl.h>
#include <sys/types.h>
#include <cerrno>
#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <string_view>
#include <ctime>
#include <algorithm>
#include <cinttypes>
#include <iterator>
#include "my_inttypes.h"
#include "my_stacktrace.h"
#include "template_utils.h"
#include <csignal>
#include "my_thread.h"
#include <unistd.h>
#include <execinfo.h>
#include <cxxabi.h>

Functions
static bool	ptr_sane (const char *p, const char *heap_end)
void	my_init_stacktrace ()
void	my_safe_puts_stderr (const char *val, size_t max_len)
static char *	my_demangle (const char *mangled_name, int *status)
static bool	my_demangle_symbol (char *line)
static void	my_demangle_symbols (char **addrs, int n)
void	my_print_stacktrace (const uchar *stack_bottom, ulong thread_stack)
void	my_write_core (int sig)
size_t	my_write_stderr (const void *buf, size_t count)
	Writes up to count bytes from buffer to STDERR. More...
char *	my_safe_utoa (int base, ulonglong val, char *buf)
	Converts a ulonglong value to string. More...
char *	my_safe_itoa (int base, longlong val, char *buf)
	Async-signal-safe utility functions used by signal handler routines. More...
static const char *	check_longlong (const char *fmt, bool *have_longlong)
static size_t	my_safe_vsnprintf (char *to, size_t size, const char *format, va_list ap)
size_t	my_safe_snprintf (char *to, size_t n, const char *fmt,...)
	A (very) limited version of snprintf. More...
size_t	my_safe_printf_stderr (const char *fmt,...)
	A (very) limited version of snprintf, which writes the result to STDERR. More...
void	my_safe_print_system_time ()
	Writes system time to STDERR without allocating new memory. More...

Variables
static const char	digits [] = "0123456789abcdef"

Function Documentation

check_longlong()

static const char * check_longlong ( const char *  fmt, bool *  have_longlong  )

static

my_demangle()

static char * my_demangle ( const char *  mangled_name, int *  status  )

static

my_demangle_symbol()

static bool my_demangle_symbol ( char *  line )

static

my_demangle_symbols()

static void my_demangle_symbols ( char **  addrs, int  n  )

static

my_init_stacktrace()

void my_init_stacktrace

(

)

my_print_stacktrace()

void my_print_stacktrace	(	const uchar *	stack_bottom,
		ulong	thread_stack
	)

my_safe_itoa()

char * my_safe_itoa	(	int	base,
		longlong	val,
		char *	buf
	)

Async-signal-safe utility functions used by signal handler routines.

Declared here in order to unit-test them. These are not general-purpose, but tailored to the signal handling routines. Converts a longlong value to string.

Parameters

base	10 for decimal, 16 for hex values (0..9a..f)
val	The value to convert
buf	Assumed to point to the end of the buffer.

Returns

Pointer to the first character of the converted string. Negative values: for base-10 the return string will be prepended with '-' for base-16 the return string will contain 16 characters Implemented with simplicity, and async-signal-safety in mind.

my_safe_print_system_time()

void my_safe_print_system_time

(

)

Writes system time to STDERR without allocating new memory.

my_safe_printf_stderr()

size_t my_safe_printf_stderr	(	const char *	fmt,
			...
	)

A (very) limited version of snprintf, which writes the result to STDERR.

See also

my_safe_snprintf Implemented with simplicity, and async-signal-safety in mind.

Note

Has an internal buffer capacity of 512 bytes, which should suffice for our signal handling routines.

my_safe_puts_stderr()

void my_safe_puts_stderr	(	const char *	val,
		size_t	max_len
	)

my_safe_snprintf()

size_t my_safe_snprintf	(	char *	to,
		size_t	n,
		const char *	fmt,
			...
	)

A (very) limited version of snprintf.

Parameters

to	Destination buffer.
n	Size of destination buffer.
fmt	printf() style format string.

Returns

Number of bytes written, including terminating '\0' Supports 'd' 'i' 'u' 'x' 'p' 's' conversion. Supports 'l' and 'll' modifiers for integral types. Does not support any width/precision. Implemented with simplicity, and async-signal-safety in mind.

my_safe_utoa()

char * my_safe_utoa	(	int	base,
		ulonglong	val,
		char *	buf
	)

Converts a ulonglong value to string.

Parameters

base	10 for decimal, 16 for hex values (0..9a..f)
val	The value to convert
buf	Assumed to point to the end of the buffer.

Returns

Pointer to the first character of the converted string. Implemented with simplicity, and async-signal-safety in mind.

my_safe_vsnprintf()

static size_t my_safe_vsnprintf ( char *  to, size_t  size, const char *  format, va_list  ap  )

static

my_write_core()

void my_write_core

(

int

sig

)

my_write_stderr()

size_t my_write_stderr	(	const void *	buf,
		size_t	count
	)

Writes up to count bytes from buffer to STDERR.

Implemented with simplicity, and async-signal-safety in mind.

Parameters

buf	Buffer containing data to be written.
count	Number of bytes to write.

Returns

Number of bytes written.

ptr_sane()

static bool ptr_sane ( const char *  p, const char *  heap_end  )

inlinestatic

Variable Documentation

digits

const char digits[] = "0123456789abcdef"

static