linux_kernel/tools/perf/util/debug.c

/* For general debugging purposes */

#include "../perf.h"

#include <string.h>
#include <stdarg.h>
#include <stdio.h>

#include "cache.h"
#include "color.h"
#include "event.h"
#include "debug.h"
#include "util.h"
#include "target.h"

#define NSECS_PER_SEC  1000000000ULL
#define NSECS_PER_USEC 1000ULL

int verbose;
bool dump_trace = false, quiet = false;
int debug_ordered_events;
static int redirect_to_stderr;

static int _eprintf(int level, int var, const char *fmt, va_list args)
{
	int ret = 0;

	if (var >= level) {
		if (use_browser >= 1 && !redirect_to_stderr)
			ui_helpline__vshow(fmt, args);
		else
			ret = vfprintf(stderr, fmt, args);
	}

	return ret;
}

int eprintf(int level, int var, const char *fmt, ...)
{
	va_list args;
	int ret;

	va_start(args, fmt);
	ret = _eprintf(level, var, fmt, args);
	va_end(args);

	return ret;
}

static int __eprintf_time(u64 t, const char *fmt, va_list args)
{
	int ret = 0;
	u64 secs, usecs, nsecs = t;

	secs   = nsecs / NSECS_PER_SEC;
	nsecs -= secs  * NSECS_PER_SEC;
	usecs  = nsecs / NSECS_PER_USEC;

	ret = fprintf(stderr, "[%13" PRIu64 ".%06" PRIu64 "] ",
		      secs, usecs);
	ret += vfprintf(stderr, fmt, args);
	return ret;
}

int eprintf_time(int level, int var, u64 t, const char *fmt, ...)
{
	int ret = 0;
	va_list args;

	if (var >= level) {
		va_start(args, fmt);
		ret = __eprintf_time(t, fmt, args);
		va_end(args);
	}

	return ret;
}

/*
 * Overloading libtraceevent standard info print
 * function, display with -v in perf.
 */
void pr_stat(const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	_eprintf(1, verbose, fmt, args);
	va_end(args);
	eprintf(1, verbose, "\n");
}

int dump_printf(const char *fmt, ...)
{
	va_list args;
	int ret = 0;

	if (dump_trace) {
		va_start(args, fmt);
		ret = vprintf(fmt, args);
		va_end(args);
	}

	return ret;
}

void trace_event(union perf_event *event)
{
	unsigned char *raw_event = (void *)event;
	const char *color = PERF_COLOR_BLUE;
	int i, j;

	if (!dump_trace)
		return;

	printf(".");
	color_fprintf(stdout, color, "\n. ... raw event: size %d bytes\n",
		      event->header.size);

	for (i = 0; i < event->header.size; i++) {
		if ((i & 15) == 0) {
			printf(".");
			color_fprintf(stdout, color, "  %04x: ", i);
		}

		color_fprintf(stdout, color, " %02x", raw_event[i]);

		if (((i & 15) == 15) || i == event->header.size-1) {
			color_fprintf(stdout, color, "  ");
			for (j = 0; j < 15-(i & 15); j++)
				color_fprintf(stdout, color, "   ");
			for (j = i & ~15; j <= i; j++) {
				color_fprintf(stdout, color, "%c",
					      isprint(raw_event[j]) ?
					      raw_event[j] : '.');
			}
			color_fprintf(stdout, color, "\n");
		}
	}
	printf(".\n");
}

static struct debug_variable {
	const char *name;
	int *ptr;
} debug_variables[] = {
	{ .name = "verbose",		.ptr = &verbose },
	{ .name = "ordered-events",	.ptr = &debug_ordered_events},
	{ .name = "stderr",		.ptr = &redirect_to_stderr},
	{ .name = NULL, }
};

int perf_debug_option(const char *str)
{
	struct debug_variable *var = &debug_variables[0];
	char *vstr, *s = strdup(str);
	int v = 1;

	vstr = strchr(s, '=');
	if (vstr)
		*vstr++ = 0;

	while (var->name) {
		if (!strcmp(s, var->name))
			break;
		var++;
	}

	if (!var->name) {
		pr_err("Unknown debug variable name '%s'\n", s);
		free(s);
		return -1;
	}

	if (vstr) {
		v = atoi(vstr);
		/*
		 * Allow only values in range (0, 10),
		 * otherwise set 0.
		 */
		v = (v < 0) || (v > 10) ? 0 : v;
	}

	*var->ptr = v;
	free(s);
	return 0;
}