// SPDX-License-Identifier: GPL-2.0
/* For general debugging purposes */

#include <inttypes.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <api/debug.h>
#include <linux/kernel.h>
#include <linux/time64.h>
#ifdef HAVE_BACKTRACE_SUPPORT
#include <execinfo.h>
#endif
#include "color.h"
#include "event.h"
#include "debug.h"
#include "print_binary.h"
#include "target.h"
#include "ui/helpline.h"
#include "ui/ui.h"
#include "util/parse-sublevel-options.h"

#include <linux/ctype.h>

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

int veprintf(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 = veprintf(level, var, fmt, args);
        va_end(args);

        return ret;
}

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

        secs   = nsecs / NSEC_PER_SEC;
        nsecs -= secs  * NSEC_PER_SEC;
        usecs  = nsecs / NSEC_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 = veprintf_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);
        veprintf(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;
}

static int trace_event_printer(enum binary_printer_ops op,
                               unsigned int val, void *extra, FILE *fp)
{
        const char *color = PERF_COLOR_BLUE;
        union perf_event *event = (union perf_event *)extra;
        unsigned char ch = (unsigned char)val;
        int printed = 0;

        switch (op) {
        case BINARY_PRINT_DATA_BEGIN:
                printed += fprintf(fp, ".");
                printed += color_fprintf(fp, color, "\n. ... raw event: size %d bytes\n",
                                         event->header.size);
                break;
        case BINARY_PRINT_LINE_BEGIN:
                printed += fprintf(fp, ".");
                break;
        case BINARY_PRINT_ADDR:
                printed += color_fprintf(fp, color, "  %04x: ", val);
                break;
        case BINARY_PRINT_NUM_DATA:
                printed += color_fprintf(fp, color, " %02x", val);
                break;
        case BINARY_PRINT_NUM_PAD:
                printed += color_fprintf(fp, color, "   ");
                break;
        case BINARY_PRINT_SEP:
                printed += color_fprintf(fp, color, "  ");
                break;
        case BINARY_PRINT_CHAR_DATA:
                printed += color_fprintf(fp, color, "%c",
                              isprint(ch) ? ch : '.');
                break;
        case BINARY_PRINT_CHAR_PAD:
                printed += color_fprintf(fp, color, " ");
                break;
        case BINARY_PRINT_LINE_END:
                printed += color_fprintf(fp, color, "\n");
                break;
        case BINARY_PRINT_DATA_END:
                printed += fprintf(fp, "\n");
                break;
        default:
                break;
        }

        return printed;
}

void trace_event(union perf_event *event)
{
        unsigned char *raw_event = (void *)event;

        if (!dump_trace)
                return;

        print_binary(raw_event, event->header.size, 16,
                     trace_event_printer, event);
}

static struct sublevel_option debug_opts[] = {
        { .name = "verbose",            .value_ptr = &verbose },
        { .name = "ordered-events",     .value_ptr = &debug_ordered_events},
        { .name = "stderr",             .value_ptr = &redirect_to_stderr},
        { .name = "data-convert",       .value_ptr = &debug_data_convert },
        { .name = "perf-event-open",    .value_ptr = &debug_peo_args },
        { .name = NULL, }
};

int perf_debug_option(const char *str)
{
        int ret;

        ret = perf_parse_sublevel_options(str, debug_opts);
        if (ret)
                return ret;

        /* Allow only verbose value in range (0, 10), otherwise set 0. */
        verbose = (verbose < 0) || (verbose > 10) ? 0 : verbose;

        return 0;
}

int perf_quiet_option(void)
{
        struct sublevel_option *opt = &debug_opts[0];

        /* disable all debug messages */
        while (opt->name) {
                *opt->value_ptr = -1;
                opt++;
        }

        return 0;
}

#define DEBUG_WRAPPER(__n, __l)                         \
static int pr_ ## __n ## _wrapper(const char *fmt, ...) \
{                                                       \
        va_list args;                                   \
        int ret;                                        \
                                                        \
        va_start(args, fmt);                            \
        ret = veprintf(__l, verbose, fmt, args);        \
        va_end(args);                                   \
        return ret;                                     \
}

DEBUG_WRAPPER(warning, 0);
DEBUG_WRAPPER(debug, 1);

void perf_debug_setup(void)
{
        libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
}

/* Obtain a backtrace and print it to stdout. */
#ifdef HAVE_BACKTRACE_SUPPORT
void dump_stack(void)
{
        void *array[16];
        size_t size = backtrace(array, ARRAY_SIZE(array));
        char **strings = backtrace_symbols(array, size);
        size_t i;

        printf("Obtained %zd stack frames.\n", size);

        for (i = 0; i < size; i++)
                printf("%s\n", strings[i]);

        free(strings);
}
#else
void dump_stack(void) {}
#endif

void sighandler_dump_stack(int sig)
{
        psignal(sig, "perf");
        dump_stack();
        signal(sig, SIG_DFL);
        raise(sig);
}