// SPDX-License-Identifier: GPL-2.0
/*
 * builtin-test.c
 *
 * Builtin regression testing command: ever growing number of sanity tests
 */
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include "builtin.h"
#include "hist.h"
#include "intlist.h"
#include "tests.h"
#include "debug.h"
#include "color.h"
#include <subcmd/parse-options.h>
#include "string2.h"
#include "symbol.h"
#include <linux/kernel.h>
#include <subcmd/exec-cmd.h>

static bool dont_fork;

struct test __weak arch_tests[] = {
        {
                .func = NULL,
        },
};

static struct test generic_tests[] = {
        {
                .desc = "vmlinux symtab matches kallsyms",
                .func = test__vmlinux_matches_kallsyms,
        },
        {
                .desc = "Detect openat syscall event",
                .func = test__openat_syscall_event,
        },
        {
                .desc = "Detect openat syscall event on all cpus",
                .func = test__openat_syscall_event_on_all_cpus,
        },
        {
                .desc = "Read samples using the mmap interface",
                .func = test__basic_mmap,
        },
        {
                .desc = "Test data source output",
                .func = test__mem,
        },
        {
                .desc = "Parse event definition strings",
                .func = test__parse_events,
        },
        {
                .desc = "Simple expression parser",
                .func = test__expr,
        },
        {
                .desc = "PERF_RECORD_* events & perf_sample fields",
                .func = test__PERF_RECORD,
        },
        {
                .desc = "Parse perf pmu format",
                .func = test__pmu,
        },
        {
                .desc = "DSO data read",
                .func = test__dso_data,
        },
        {
                .desc = "DSO data cache",
                .func = test__dso_data_cache,
        },
        {
                .desc = "DSO data reopen",
                .func = test__dso_data_reopen,
        },
        {
                .desc = "Roundtrip evsel->name",
                .func = test__perf_evsel__roundtrip_name_test,
        },
        {
                .desc = "Parse sched tracepoints fields",
                .func = test__perf_evsel__tp_sched_test,
        },
        {
                .desc = "syscalls:sys_enter_openat event fields",
                .func = test__syscall_openat_tp_fields,
        },
        {
                .desc = "Setup struct perf_event_attr",
                .func = test__attr,
        },
        {
                .desc = "Match and link multiple hists",
                .func = test__hists_link,
        },
        {
                .desc = "'import perf' in python",
                .func = test__python_use,
        },
        {
                .desc = "Breakpoint overflow signal handler",
                .func = test__bp_signal,
                .is_supported = test__bp_signal_is_supported,
        },
        {
                .desc = "Breakpoint overflow sampling",
                .func = test__bp_signal_overflow,
                .is_supported = test__bp_signal_is_supported,
        },
        {
                .desc = "Number of exit events of a simple workload",
                .func = test__task_exit,
        },
        {
                .desc = "Software clock events period values",
                .func = test__sw_clock_freq,
        },
        {
                .desc = "Object code reading",
                .func = test__code_reading,
        },
        {
                .desc = "Sample parsing",
                .func = test__sample_parsing,
        },
        {
                .desc = "Use a dummy software event to keep tracking",
                .func = test__keep_tracking,
        },
        {
                .desc = "Parse with no sample_id_all bit set",
                .func = test__parse_no_sample_id_all,
        },
        {
                .desc = "Filter hist entries",
                .func = test__hists_filter,
        },
        {
                .desc = "Lookup mmap thread",
                .func = test__mmap_thread_lookup,
        },
        {
                .desc = "Share thread mg",
                .func = test__thread_mg_share,
        },
        {
                .desc = "Sort output of hist entries",
                .func = test__hists_output,
        },
        {
                .desc = "Cumulate child hist entries",
                .func = test__hists_cumulate,
        },
        {
                .desc = "Track with sched_switch",
                .func = test__switch_tracking,
        },
        {
                .desc = "Filter fds with revents mask in a fdarray",
                .func = test__fdarray__filter,
        },
        {
                .desc = "Add fd to a fdarray, making it autogrow",
                .func = test__fdarray__add,
        },
        {
                .desc = "kmod_path__parse",
                .func = test__kmod_path__parse,
        },
        {
                .desc = "Thread map",
                .func = test__thread_map,
        },
        {
                .desc = "LLVM search and compile",
                .func = test__llvm,
                .subtest = {
                        .skip_if_fail   = true,
                        .get_nr         = test__llvm_subtest_get_nr,
                        .get_desc       = test__llvm_subtest_get_desc,
                },
        },
        {
                .desc = "Session topology",
                .func = test__session_topology,
        },
        {
                .desc = "BPF filter",
                .func = test__bpf,
                .subtest = {
                        .skip_if_fail   = true,
                        .get_nr         = test__bpf_subtest_get_nr,
                        .get_desc       = test__bpf_subtest_get_desc,
                },
        },
        {
                .desc = "Synthesize thread map",
                .func = test__thread_map_synthesize,
        },
        {
                .desc = "Remove thread map",
                .func = test__thread_map_remove,
        },
        {
                .desc = "Synthesize cpu map",
                .func = test__cpu_map_synthesize,
        },
        {
                .desc = "Synthesize stat config",
                .func = test__synthesize_stat_config,
        },
        {
                .desc = "Synthesize stat",
                .func = test__synthesize_stat,
        },
        {
                .desc = "Synthesize stat round",
                .func = test__synthesize_stat_round,
        },
        {
                .desc = "Synthesize attr update",
                .func = test__event_update,
        },
        {
                .desc = "Event times",
                .func = test__event_times,
        },
        {
                .desc = "Read backward ring buffer",
                .func = test__backward_ring_buffer,
        },
        {
                .desc = "Print cpu map",
                .func = test__cpu_map_print,
        },
        {
                .desc = "Probe SDT events",
                .func = test__sdt_event,
        },
        {
                .desc = "is_printable_array",
                .func = test__is_printable_array,
        },
        {
                .desc = "Print bitmap",
                .func = test__bitmap_print,
        },
        {
                .desc = "perf hooks",
                .func = test__perf_hooks,
        },
        {
                .desc = "builtin clang support",
                .func = test__clang,
                .subtest = {
                        .skip_if_fail   = true,
                        .get_nr         = test__clang_subtest_get_nr,
                        .get_desc       = test__clang_subtest_get_desc,
                }
        },
        {
                .desc = "unit_number__scnprintf",
                .func = test__unit_number__scnprint,
        },
        {
                .func = NULL,
        },
};

static struct test *tests[] = {
        generic_tests,
        arch_tests,
};

static bool perf_test__matches(struct test *test, int curr, int argc, const char *argv[])
{
        int i;

        if (argc == 0)
                return true;

        for (i = 0; i < argc; ++i) {
                char *end;
                long nr = strtoul(argv[i], &end, 10);

                if (*end == '\0') {
                        if (nr == curr + 1)
                                return true;
                        continue;
                }

                if (strcasestr(test->desc, argv[i]))
                        return true;
        }

        return false;
}

static int run_test(struct test *test, int subtest)
{
        int status, err = -1, child = dont_fork ? 0 : fork();
        char sbuf[STRERR_BUFSIZE];

        if (child < 0) {
                pr_err("failed to fork test: %s\n",
                        str_error_r(errno, sbuf, sizeof(sbuf)));
                return -1;
        }

        if (!child) {
                if (!dont_fork) {
                        pr_debug("test child forked, pid %d\n", getpid());

                        if (verbose <= 0) {
                                int nullfd = open("/dev/null", O_WRONLY);

                                if (nullfd >= 0) {
                                        close(STDERR_FILENO);
                                        close(STDOUT_FILENO);

                                        dup2(nullfd, STDOUT_FILENO);
                                        dup2(STDOUT_FILENO, STDERR_FILENO);
                                        close(nullfd);
                                }
                        } else {
                                signal(SIGSEGV, sighandler_dump_stack);
                                signal(SIGFPE, sighandler_dump_stack);
                        }
                }

                err = test->func(test, subtest);
                if (!dont_fork)
                        exit(err);
        }

        if (!dont_fork) {
                wait(&status);

                if (WIFEXITED(status)) {
                        err = (signed char)WEXITSTATUS(status);
                        pr_debug("test child finished with %d\n", err);
                } else if (WIFSIGNALED(status)) {
                        err = -1;
                        pr_debug("test child interrupted\n");
                }
        }

        return err;
}

#define for_each_test(j, t)                                     \
        for (j = 0; j < ARRAY_SIZE(tests); j++) \
                for (t = &tests[j][0]; t->func; t++)

static int test_and_print(struct test *t, bool force_skip, int subtest)
{
        int err;

        if (!force_skip) {
                pr_debug("\n--- start ---\n");
                err = run_test(t, subtest);
                pr_debug("---- end ----\n");
        } else {
                pr_debug("\n--- force skipped ---\n");
                err = TEST_SKIP;
        }

        if (!t->subtest.get_nr)
                pr_debug("%s:", t->desc);
        else
                pr_debug("%s subtest %d:", t->desc, subtest);

        switch (err) {
        case TEST_OK:
                pr_info(" Ok\n");
                break;
        case TEST_SKIP:
                color_fprintf(stderr, PERF_COLOR_YELLOW, " Skip\n");
                break;
        case TEST_FAIL:
        default:
                color_fprintf(stderr, PERF_COLOR_RED, " FAILED!\n");
                break;
        }

        return err;
}

static const char *shell_test__description(char *description, size_t size,
                                           const char *path, const char *name)
{
        FILE *fp;
        char filename[PATH_MAX];

        path__join(filename, sizeof(filename), path, name);
        fp = fopen(filename, "r");
        if (!fp)
                return NULL;

        description = fgets(description, size, fp);
        fclose(fp);

        return description ? trim(description + 1) : NULL;
}

#define for_each_shell_test(dir, ent)           \
        while ((ent = readdir(dir)) != NULL)    \
                if (ent->d_type == DT_REG && ent->d_name[0] != '.')

static const char *shell_tests__dir(char *path, size_t size)
{
        const char *devel_dirs[] = { "./tools/perf/tests", "./tests", };
        char *exec_path;
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(devel_dirs); ++i) {
                struct stat st;
                if (!lstat(devel_dirs[i], &st)) {
                        scnprintf(path, size, "%s/shell", devel_dirs[i]);
                        if (!lstat(devel_dirs[i], &st))
                                return path;
                }
        }

        /* Then installed path. */
        exec_path = get_argv_exec_path();
        scnprintf(path, size, "%s/tests/shell", exec_path);
        free(exec_path);
        return path;
}

static int shell_tests__max_desc_width(void)
{
        DIR *dir;
        struct dirent *ent;
        char path_dir[PATH_MAX];
        const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
        int width = 0;

        if (path == NULL)
                return -1;

        dir = opendir(path);
        if (!dir)
                return -1;

        for_each_shell_test(dir, ent) {
                char bf[256];
                const char *desc = shell_test__description(bf, sizeof(bf), path, ent->d_name);

                if (desc) {
                        int len = strlen(desc);

                        if (width < len)
                                width = len;
                }
        }

        closedir(dir);
        return width;
}

struct shell_test {
        const char *dir;
        const char *file;
};

static int shell_test__run(struct test *test, int subdir __maybe_unused)
{
        int err;
        char script[PATH_MAX];
        struct shell_test *st = test->priv;

        path__join(script, sizeof(script), st->dir, st->file);

        err = system(script);
        if (!err)
                return TEST_OK;

        return WEXITSTATUS(err) == 2 ? TEST_SKIP : TEST_FAIL;
}

static int run_shell_tests(int argc, const char *argv[], int i, int width)
{
        DIR *dir;
        struct dirent *ent;
        char path_dir[PATH_MAX];
        struct shell_test st = {
                .dir = shell_tests__dir(path_dir, sizeof(path_dir)),
        };

        if (st.dir == NULL)
                return -1;

        dir = opendir(st.dir);
        if (!dir)
                return -1;

        for_each_shell_test(dir, ent) {
                int curr = i++;
                char desc[256];
                struct test test = {
                        .desc = shell_test__description(desc, sizeof(desc), st.dir, ent->d_name),
                        .func = shell_test__run,
                        .priv = &st,
                };

                if (!perf_test__matches(&test, curr, argc, argv))
                        continue;

                st.file = ent->d_name;
                pr_info("%2d: %-*s:", i, width, test.desc);
                test_and_print(&test, false, -1);
        }

        closedir(dir);
        return 0;
}

static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
{
        struct test *t;
        unsigned int j;
        int i = 0;
        int width = shell_tests__max_desc_width();

        for_each_test(j, t) {
                int len = strlen(t->desc);

                if (width < len)
                        width = len;
        }

        for_each_test(j, t) {
                int curr = i++, err;

                if (!perf_test__matches(t, curr, argc, argv))
                        continue;

                if (t->is_supported && !t->is_supported()) {
                        pr_debug("%2d: %-*s: Disabled\n", i, width, t->desc);
                        continue;
                }

                pr_info("%2d: %-*s:", i, width, t->desc);

                if (intlist__find(skiplist, i)) {
                        color_fprintf(stderr, PERF_COLOR_YELLOW, " Skip (user override)\n");
                        continue;
                }

                if (!t->subtest.get_nr) {
                        test_and_print(t, false, -1);
                } else {
                        int subn = t->subtest.get_nr();
                        /*
                         * minus 2 to align with normal testcases.
                         * For subtest we print additional '.x' in number.
                         * for example:
                         *
                         * 35: Test LLVM searching and compiling                        :
                         * 35.1: Basic BPF llvm compiling test                          : Ok
                         */
                        int subw = width > 2 ? width - 2 : width;
                        bool skip = false;
                        int subi;

                        if (subn <= 0) {
                                color_fprintf(stderr, PERF_COLOR_YELLOW,
                                              " Skip (not compiled in)\n");
                                continue;
                        }
                        pr_info("\n");

                        for (subi = 0; subi < subn; subi++) {
                                int len = strlen(t->subtest.get_desc(subi));

                                if (subw < len)
                                        subw = len;
                        }

                        for (subi = 0; subi < subn; subi++) {
                                pr_info("%2d.%1d: %-*s:", i, subi + 1, subw,
                                        t->subtest.get_desc(subi));
                                err = test_and_print(t, skip, subi);
                                if (err != TEST_OK && t->subtest.skip_if_fail)
                                        skip = true;
                        }
                }
        }

        return run_shell_tests(argc, argv, i, width);
}

static int perf_test__list_shell(int argc, const char **argv, int i)
{
        DIR *dir;
        struct dirent *ent;
        char path_dir[PATH_MAX];
        const char *path = shell_tests__dir(path_dir, sizeof(path_dir));

        if (path == NULL)
                return -1;

        dir = opendir(path);
        if (!dir)
                return -1;

        for_each_shell_test(dir, ent) {
                int curr = i++;
                char bf[256];
                struct test t = {
                        .desc = shell_test__description(bf, sizeof(bf), path, ent->d_name),
                };

                if (!perf_test__matches(&t, curr, argc, argv))
                        continue;

                pr_info("%2d: %s\n", i, t.desc);
        }

        closedir(dir);
        return 0;
}

static int perf_test__list(int argc, const char **argv)
{
        unsigned int j;
        struct test *t;
        int i = 0;

        for_each_test(j, t) {
                int curr = i++;

                if (!perf_test__matches(t, curr, argc, argv) ||
                    (t->is_supported && !t->is_supported()))
                        continue;

                pr_info("%2d: %s\n", i, t->desc);
        }

        perf_test__list_shell(argc, argv, i);

        return 0;
}

int cmd_test(int argc, const char **argv)
{
        const char *test_usage[] = {
        "perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]",
        NULL,
        };
        const char *skip = NULL;
        const struct option test_options[] = {
        OPT_STRING('s', "skip", &skip, "tests", "tests to skip"),
        OPT_INCR('v', "verbose", &verbose,
                    "be more verbose (show symbol address, etc)"),
        OPT_BOOLEAN('F', "dont-fork", &dont_fork,
                    "Do not fork for testcase"),
        OPT_END()
        };
        const char * const test_subcommands[] = { "list", NULL };
        struct intlist *skiplist = NULL;
        int ret = hists__init();

        if (ret < 0)
                return ret;

        argc = parse_options_subcommand(argc, argv, test_options, test_subcommands, test_usage, 0);
        if (argc >= 1 && !strcmp(argv[0], "list"))
                return perf_test__list(argc - 1, argv + 1);

        symbol_conf.priv_size = sizeof(int);
        symbol_conf.sort_by_name = true;
        symbol_conf.try_vmlinux_path = true;

        if (symbol__init(NULL) < 0)
                return -1;

        if (skip != NULL)
                skiplist = intlist__new(skip);

        return __cmd_test(argc, argv, skiplist);
}