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FFmpeg/tests/checkasm/checkasm.c
James Almer ba89dc27b5 checkasm: add an af_afir test 
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2019-01-03 10:12:18 -03:00

825 lines
22 KiB
C
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/*
* Assembly testing and benchmarking tool
* Copyright (c) 2015 Henrik Gramner
* Copyright (c) 2008 Loren Merritt
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#if CONFIG_LINUX_PERF
# ifndef _GNU_SOURCE
# define _GNU_SOURCE // for syscall (performance monitoring API)
# endif
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "checkasm.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/intfloat.h"
#include "libavutil/random_seed.h"
#if HAVE_IO_H
#include <io.h>
#endif
#if HAVE_SETCONSOLETEXTATTRIBUTE
#include <windows.h>
#define COLOR_RED FOREGROUND_RED
#define COLOR_GREEN FOREGROUND_GREEN
#define COLOR_YELLOW (FOREGROUND_RED|FOREGROUND_GREEN)
#else
#define COLOR_RED 1
#define COLOR_GREEN 2
#define COLOR_YELLOW 3
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if !HAVE_ISATTY
#define isatty(fd) 1
#endif
#if ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
#include "libavutil/arm/cpu.h"
void (*checkasm_checked_call)(void *func, int dummy, ...) = checkasm_checked_call_novfp;
#endif
/* List of tests to invoke */
static const struct {
const char *name;
void (*func)(void);
} tests[] = {
#if CONFIG_AVCODEC
#if CONFIG_AAC_DECODER
{ "aacpsdsp", checkasm_check_aacpsdsp },
{ "sbrdsp", checkasm_check_sbrdsp },
#endif
#if CONFIG_ALAC_DECODER
{ "alacdsp", checkasm_check_alacdsp },
#endif
#if CONFIG_AUDIODSP
{ "audiodsp", checkasm_check_audiodsp },
#endif
#if CONFIG_BLOCKDSP
{ "blockdsp", checkasm_check_blockdsp },
#endif
#if CONFIG_BSWAPDSP
{ "bswapdsp", checkasm_check_bswapdsp },
#endif
#if CONFIG_DCA_DECODER
{ "synth_filter", checkasm_check_synth_filter },
#endif
#if CONFIG_EXR_DECODER
{ "exrdsp", checkasm_check_exrdsp },
#endif
#if CONFIG_FLACDSP
{ "flacdsp", checkasm_check_flacdsp },
#endif
#if CONFIG_FMTCONVERT
{ "fmtconvert", checkasm_check_fmtconvert },
#endif
#if CONFIG_G722DSP
{ "g722dsp", checkasm_check_g722dsp },
#endif
#if CONFIG_H264DSP
{ "h264dsp", checkasm_check_h264dsp },
#endif
#if CONFIG_H264PRED
{ "h264pred", checkasm_check_h264pred },
#endif
#if CONFIG_H264QPEL
{ "h264qpel", checkasm_check_h264qpel },
#endif
#if CONFIG_HEVC_DECODER
{ "hevc_add_res", checkasm_check_hevc_add_res },
{ "hevc_idct", checkasm_check_hevc_idct },
{ "hevc_sao", checkasm_check_hevc_sao },
#endif
#if CONFIG_HUFFYUV_DECODER
{ "huffyuvdsp", checkasm_check_huffyuvdsp },
#endif
#if CONFIG_JPEG2000_DECODER
{ "jpeg2000dsp", checkasm_check_jpeg2000dsp },
#endif
#if CONFIG_HUFFYUVDSP
{ "llviddsp", checkasm_check_llviddsp },
#endif
#if CONFIG_LLVIDENCDSP
{ "llviddspenc", checkasm_check_llviddspenc },
#endif
#if CONFIG_PIXBLOCKDSP
{ "pixblockdsp", checkasm_check_pixblockdsp },
#endif
#if CONFIG_UTVIDEO_DECODER
{ "utvideodsp", checkasm_check_utvideodsp },
#endif
#if CONFIG_V210_ENCODER
{ "v210enc", checkasm_check_v210enc },
#endif
#if CONFIG_VP8DSP
{ "vp8dsp", checkasm_check_vp8dsp },
#endif
#if CONFIG_VP9_DECODER
{ "vp9dsp", checkasm_check_vp9dsp },
#endif
#if CONFIG_VIDEODSP
{ "videodsp", checkasm_check_videodsp },
#endif
#endif
#if CONFIG_AVFILTER
#if CONFIG_AFIR_FILTER
{ "af_afir", checkasm_check_afir },
#endif
#if CONFIG_BLEND_FILTER
{ "vf_blend", checkasm_check_blend },
#endif
#if CONFIG_COLORSPACE_FILTER
{ "vf_colorspace", checkasm_check_colorspace },
#endif
#if CONFIG_HFLIP_FILTER
{ "vf_hflip", checkasm_check_vf_hflip },
#endif
#if CONFIG_NLMEANS_FILTER
{ "vf_nlmeans", checkasm_check_nlmeans },
#endif
#if CONFIG_THRESHOLD_FILTER
{ "vf_threshold", checkasm_check_vf_threshold },
#endif
#endif
#if CONFIG_SWSCALE
{ "sw_rgb", checkasm_check_sw_rgb },
#endif
#if CONFIG_AVUTIL
{ "fixed_dsp", checkasm_check_fixed_dsp },
{ "float_dsp", checkasm_check_float_dsp },
#endif
{ NULL }
};
/* List of cpu flags to check */
static const struct {
const char *name;
const char *suffix;
int flag;
} cpus[] = {
#if ARCH_AARCH64
{ "ARMV8", "armv8", AV_CPU_FLAG_ARMV8 },
{ "NEON", "neon", AV_CPU_FLAG_NEON },
#elif ARCH_ARM
{ "ARMV5TE", "armv5te", AV_CPU_FLAG_ARMV5TE },
{ "ARMV6", "armv6", AV_CPU_FLAG_ARMV6 },
{ "ARMV6T2", "armv6t2", AV_CPU_FLAG_ARMV6T2 },
{ "VFP", "vfp", AV_CPU_FLAG_VFP },
{ "VFP_VM", "vfp_vm", AV_CPU_FLAG_VFP_VM },
{ "VFPV3", "vfp3", AV_CPU_FLAG_VFPV3 },
{ "NEON", "neon", AV_CPU_FLAG_NEON },
#elif ARCH_PPC
{ "ALTIVEC", "altivec", AV_CPU_FLAG_ALTIVEC },
{ "VSX", "vsx", AV_CPU_FLAG_VSX },
{ "POWER8", "power8", AV_CPU_FLAG_POWER8 },
#elif ARCH_X86
{ "MMX", "mmx", AV_CPU_FLAG_MMX|AV_CPU_FLAG_CMOV },
{ "MMXEXT", "mmxext", AV_CPU_FLAG_MMXEXT },
{ "3DNOW", "3dnow", AV_CPU_FLAG_3DNOW },
{ "3DNOWEXT", "3dnowext", AV_CPU_FLAG_3DNOWEXT },
{ "SSE", "sse", AV_CPU_FLAG_SSE },
{ "SSE2", "sse2", AV_CPU_FLAG_SSE2|AV_CPU_FLAG_SSE2SLOW },
{ "SSE3", "sse3", AV_CPU_FLAG_SSE3|AV_CPU_FLAG_SSE3SLOW },
{ "SSSE3", "ssse3", AV_CPU_FLAG_SSSE3|AV_CPU_FLAG_ATOM },
{ "SSE4.1", "sse4", AV_CPU_FLAG_SSE4 },
{ "SSE4.2", "sse42", AV_CPU_FLAG_SSE42 },
{ "AES-NI", "aesni", AV_CPU_FLAG_AESNI },
{ "AVX", "avx", AV_CPU_FLAG_AVX },
{ "XOP", "xop", AV_CPU_FLAG_XOP },
{ "FMA3", "fma3", AV_CPU_FLAG_FMA3 },
{ "FMA4", "fma4", AV_CPU_FLAG_FMA4 },
{ "AVX2", "avx2", AV_CPU_FLAG_AVX2 },
{ "AVX-512", "avx512", AV_CPU_FLAG_AVX512 },
#endif
{ NULL }
};
typedef struct CheckasmFuncVersion {
struct CheckasmFuncVersion *next;
void *func;
int ok;
int cpu;
CheckasmPerf perf;
} CheckasmFuncVersion;
/* Binary search tree node */
typedef struct CheckasmFunc {
struct CheckasmFunc *child[2];
CheckasmFuncVersion versions;
uint8_t color; /* 0 = red, 1 = black */
char name[1];
} CheckasmFunc;
/* Internal state */
static struct {
CheckasmFunc *funcs;
CheckasmFunc *current_func;
CheckasmFuncVersion *current_func_ver;
const char *current_test_name;
const char *bench_pattern;
int bench_pattern_len;
int num_checked;
int num_failed;
/* perf */
int nop_time;
int sysfd;
int cpu_flag;
const char *cpu_flag_name;
const char *test_name;
} state;
/* PRNG state */
AVLFG checkasm_lfg;
/* float compare support code */
static int is_negative(union av_intfloat32 u)
{
return u.i >> 31;
}
int float_near_ulp(float a, float b, unsigned max_ulp)
{
union av_intfloat32 x, y;
x.f = a;
y.f = b;
if (is_negative(x) != is_negative(y)) {
// handle -0.0 == +0.0
return a == b;
}
if (llabs((int64_t)x.i - y.i) <= max_ulp)
return 1;
return 0;
}
int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!float_near_ulp(a[i], b[i], max_ulp))
return 0;
}
return 1;
}
int float_near_abs_eps(float a, float b, float eps)
{
float abs_diff = fabsf(a - b);
if (abs_diff < eps)
return 1;
fprintf(stderr, "test failed comparing %g with %g (abs diff=%g with EPS=%g)\n", a, b, abs_diff, eps);
return 0;
}
int float_near_abs_eps_array(const float *a, const float *b, float eps,
unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!float_near_abs_eps(a[i], b[i], eps))
return 0;
}
return 1;
}
int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp)
{
return float_near_ulp(a, b, max_ulp) || float_near_abs_eps(a, b, eps);
}
int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
unsigned max_ulp, unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!float_near_abs_eps_ulp(a[i], b[i], eps, max_ulp))
return 0;
}
return 1;
}
int double_near_abs_eps(double a, double b, double eps)
{
double abs_diff = fabs(a - b);
return abs_diff < eps;
}
int double_near_abs_eps_array(const double *a, const double *b, double eps,
unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!double_near_abs_eps(a[i], b[i], eps))
return 0;
}
return 1;
}
/* Print colored text to stderr if the terminal supports it */
static void color_printf(int color, const char *fmt, ...)
{
static int use_color = -1;
va_list arg;
#if HAVE_SETCONSOLETEXTATTRIBUTE
static HANDLE con;
static WORD org_attributes;
if (use_color < 0) {
CONSOLE_SCREEN_BUFFER_INFO con_info;
con = GetStdHandle(STD_ERROR_HANDLE);
if (con && con != INVALID_HANDLE_VALUE && GetConsoleScreenBufferInfo(con, &con_info)) {
org_attributes = con_info.wAttributes;
use_color = 1;
} else
use_color = 0;
}
if (use_color)
SetConsoleTextAttribute(con, (org_attributes & 0xfff0) | (color & 0x0f));
#else
if (use_color < 0) {
const char *term = getenv("TERM");
use_color = term && strcmp(term, "dumb") && isatty(2);
}
if (use_color)
fprintf(stderr, "\x1b[%d;3%dm", (color & 0x08) >> 3, color & 0x07);
#endif
va_start(arg, fmt);
vfprintf(stderr, fmt, arg);
va_end(arg);
if (use_color) {
#if HAVE_SETCONSOLETEXTATTRIBUTE
SetConsoleTextAttribute(con, org_attributes);
#else
fprintf(stderr, "\x1b[0m");
#endif
}
}
/* Deallocate a tree */
static void destroy_func_tree(CheckasmFunc *f)
{
if (f) {
CheckasmFuncVersion *v = f->versions.next;
while (v) {
CheckasmFuncVersion *next = v->next;
free(v);
v = next;
}
destroy_func_tree(f->child[0]);
destroy_func_tree(f->child[1]);
free(f);
}
}
/* Allocate a zero-initialized block, clean up and exit on failure */
static void *checkasm_malloc(size_t size)
{
void *ptr = calloc(1, size);
if (!ptr) {
fprintf(stderr, "checkasm: malloc failed\n");
destroy_func_tree(state.funcs);
exit(1);
}
return ptr;
}
/* Get the suffix of the specified cpu flag */
static const char *cpu_suffix(int cpu)
{
int i = FF_ARRAY_ELEMS(cpus);
while (--i >= 0)
if (cpu & cpus[i].flag)
return cpus[i].suffix;
return "c";
}
static int cmp_nop(const void *a, const void *b)
{
return *(const uint16_t*)a - *(const uint16_t*)b;
}
/* Measure the overhead of the timing code (in decicycles) */
static int measure_nop_time(void)
{
uint16_t nops[10000];
int i, nop_sum = 0;
av_unused const int sysfd = state.sysfd;
uint64_t t = 0;
for (i = 0; i < 10000; i++) {
PERF_START(t);
PERF_STOP(t);
nops[i] = t;
}
qsort(nops, 10000, sizeof(uint16_t), cmp_nop);
for (i = 2500; i < 7500; i++)
nop_sum += nops[i];
return nop_sum / 500;
}
/* Print benchmark results */
static void print_benchs(CheckasmFunc *f)
{
if (f) {
print_benchs(f->child[0]);
/* Only print functions with at least one assembly version */
if (f->versions.cpu || f->versions.next) {
CheckasmFuncVersion *v = &f->versions;
do {
CheckasmPerf *p = &v->perf;
if (p->iterations) {
int decicycles = (10*p->cycles/p->iterations - state.nop_time) / 4;
printf("%s_%s: %d.%d\n", f->name, cpu_suffix(v->cpu), decicycles/10, decicycles%10);
}
} while ((v = v->next));
}
print_benchs(f->child[1]);
}
}
/* ASCIIbetical sort except preserving natural order for numbers */
static int cmp_func_names(const char *a, const char *b)
{
const char *start = a;
int ascii_diff, digit_diff;
for (; !(ascii_diff = *(const unsigned char*)a - *(const unsigned char*)b) && *a; a++, b++);
for (; av_isdigit(*a) && av_isdigit(*b); a++, b++);
if (a > start && av_isdigit(a[-1]) && (digit_diff = av_isdigit(*a) - av_isdigit(*b)))
return digit_diff;
return ascii_diff;
}
/* Perform a tree rotation in the specified direction and return the new root */
static CheckasmFunc *rotate_tree(CheckasmFunc *f, int dir)
{
CheckasmFunc *r = f->child[dir^1];
f->child[dir^1] = r->child[dir];
r->child[dir] = f;
r->color = f->color;
f->color = 0;
return r;
}
#define is_red(f) ((f) && !(f)->color)
/* Balance a left-leaning red-black tree at the specified node */
static void balance_tree(CheckasmFunc **root)
{
CheckasmFunc *f = *root;
if (is_red(f->child[0]) && is_red(f->child[1])) {
f->color ^= 1;
f->child[0]->color = f->child[1]->color = 1;
}
if (!is_red(f->child[0]) && is_red(f->child[1]))
*root = rotate_tree(f, 0); /* Rotate left */
else if (is_red(f->child[0]) && is_red(f->child[0]->child[0]))
*root = rotate_tree(f, 1); /* Rotate right */
}
/* Get a node with the specified name, creating it if it doesn't exist */
static CheckasmFunc *get_func(CheckasmFunc **root, const char *name)
{
CheckasmFunc *f = *root;
if (f) {
/* Search the tree for a matching node */
int cmp = cmp_func_names(name, f->name);
if (cmp) {
f = get_func(&f->child[cmp > 0], name);
/* Rebalance the tree on the way up if a new node was inserted */
if (!f->versions.func)
balance_tree(root);
}
} else {
/* Allocate and insert a new node into the tree */
int name_length = strlen(name);
f = *root = checkasm_malloc(sizeof(CheckasmFunc) + name_length);
memcpy(f->name, name, name_length + 1);
}
return f;
}
/* Perform tests and benchmarks for the specified cpu flag if supported by the host */
static void check_cpu_flag(const char *name, int flag)
{
int old_cpu_flag = state.cpu_flag;
flag |= old_cpu_flag;
av_force_cpu_flags(-1);
state.cpu_flag = flag & av_get_cpu_flags();
av_force_cpu_flags(state.cpu_flag);
if (!flag || state.cpu_flag != old_cpu_flag) {
int i;
state.cpu_flag_name = name;
for (i = 0; tests[i].func; i++) {
if (state.test_name && strcmp(tests[i].name, state.test_name))
continue;
state.current_test_name = tests[i].name;
tests[i].func();
}
}
}
/* Print the name of the current CPU flag, but only do it once */
static void print_cpu_name(void)
{
if (state.cpu_flag_name) {
color_printf(COLOR_YELLOW, "%s:\n", state.cpu_flag_name);
state.cpu_flag_name = NULL;
}
}
#if CONFIG_LINUX_PERF
static int bench_init_linux(void)
{
struct perf_event_attr attr = {
.type = PERF_TYPE_HARDWARE,
.size = sizeof(struct perf_event_attr),
.config = PERF_COUNT_HW_CPU_CYCLES,
.disabled = 1, // start counting only on demand
.exclude_kernel = 1,
.exclude_hv = 1,
};
printf("benchmarking with Linux Perf Monitoring API\n");
state.sysfd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
if (state.sysfd == -1) {
perror("syscall");
return -1;
}
return 0;
}
#endif
static int bench_init_ffmpeg(void)
{
#ifdef AV_READ_TIME
printf("benchmarking with native FFmpeg timers\n");
return 0;
#else
fprintf(stderr, "checkasm: --bench is not supported on your system\n");
return -1;
#endif
}
static int bench_init(void)
{
#if CONFIG_LINUX_PERF
int ret = bench_init_linux();
#else
int ret = bench_init_ffmpeg();
#endif
if (ret < 0)
return ret;
state.nop_time = measure_nop_time();
printf("nop: %d.%d\n", state.nop_time/10, state.nop_time%10);
return 0;
}
static void bench_uninit(void)
{
#if CONFIG_LINUX_PERF
if (state.sysfd > 0)
close(state.sysfd);
#endif
}
int main(int argc, char *argv[])
{
unsigned int seed = av_get_random_seed();
int i, ret = 0;
#if ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
if (have_vfp(av_get_cpu_flags()) || have_neon(av_get_cpu_flags()))
checkasm_checked_call = checkasm_checked_call_vfp;
#endif
if (!tests[0].func || !cpus[0].flag) {
fprintf(stderr, "checkasm: no tests to perform\n");
return 0;
}
while (argc > 1) {
if (!strncmp(argv[1], "--bench", 7)) {
if (bench_init() < 0)
return 1;
if (argv[1][7] == '=') {
state.bench_pattern = argv[1] + 8;
state.bench_pattern_len = strlen(state.bench_pattern);
} else
state.bench_pattern = "";
} else if (!strncmp(argv[1], "--test=", 7)) {
state.test_name = argv[1] + 7;
} else {
seed = strtoul(argv[1], NULL, 10);
}
argc--;
argv++;
}
fprintf(stderr, "checkasm: using random seed %u\n", seed);
av_lfg_init(&checkasm_lfg, seed);
check_cpu_flag(NULL, 0);
for (i = 0; cpus[i].flag; i++)
check_cpu_flag(cpus[i].name, cpus[i].flag);
if (state.num_failed) {
fprintf(stderr, "checkasm: %d of %d tests have failed\n", state.num_failed, state.num_checked);
ret = 1;
} else {
fprintf(stderr, "checkasm: all %d tests passed\n", state.num_checked);
if (state.bench_pattern) {
print_benchs(state.funcs);
}
}
destroy_func_tree(state.funcs);
bench_uninit();
return ret;
}
/* Decide whether or not the specified function needs to be tested and
* allocate/initialize data structures if needed. Returns a pointer to a
* reference function if the function should be tested, otherwise NULL */
void *checkasm_check_func(void *func, const char *name, ...)
{
char name_buf[256];
void *ref = func;
CheckasmFuncVersion *v;
int name_length;
va_list arg;
va_start(arg, name);
name_length = vsnprintf(name_buf, sizeof(name_buf), name, arg);
va_end(arg);
if (!func || name_length <= 0 || name_length >= sizeof(name_buf))
return NULL;
state.current_func = get_func(&state.funcs, name_buf);
state.funcs->color = 1;
v = &state.current_func->versions;
if (v->func) {
CheckasmFuncVersion *prev;
do {
/* Only test functions that haven't already been tested */
if (v->func == func)
return NULL;
if (v->ok)
ref = v->func;
prev = v;
} while ((v = v->next));
v = prev->next = checkasm_malloc(sizeof(CheckasmFuncVersion));
}
v->func = func;
v->ok = 1;
v->cpu = state.cpu_flag;
state.current_func_ver = v;
if (state.cpu_flag)
state.num_checked++;
return ref;
}
/* Decide whether or not the current function needs to be benchmarked */
int checkasm_bench_func(void)
{
return !state.num_failed && state.bench_pattern &&
!strncmp(state.current_func->name, state.bench_pattern, state.bench_pattern_len);
}
/* Indicate that the current test has failed */
void checkasm_fail_func(const char *msg, ...)
{
if (state.current_func_ver->cpu && state.current_func_ver->ok) {
va_list arg;
print_cpu_name();
fprintf(stderr, " %s_%s (", state.current_func->name, cpu_suffix(state.current_func_ver->cpu));
va_start(arg, msg);
vfprintf(stderr, msg, arg);
va_end(arg);
fprintf(stderr, ")\n");
state.current_func_ver->ok = 0;
state.num_failed++;
}
}
/* Get the benchmark context of the current function */
CheckasmPerf *checkasm_get_perf_context(void)
{
CheckasmPerf *perf = &state.current_func_ver->perf;
memset(perf, 0, sizeof(*perf));
perf->sysfd = state.sysfd;
return perf;
}
/* Print the outcome of all tests performed since the last time this function was called */
void checkasm_report(const char *name, ...)
{
static int prev_checked, prev_failed, max_length;
if (state.num_checked > prev_checked) {
int pad_length = max_length + 4;
va_list arg;
print_cpu_name();
pad_length -= fprintf(stderr, " - %s.", state.current_test_name);
va_start(arg, name);
pad_length -= vfprintf(stderr, name, arg);
va_end(arg);
fprintf(stderr, "%*c", FFMAX(pad_length, 0) + 2, '[');
if (state.num_failed == prev_failed)
color_printf(COLOR_GREEN, "OK");
else
color_printf(COLOR_RED, "FAILED");
fprintf(stderr, "]\n");
prev_checked = state.num_checked;
prev_failed = state.num_failed;
} else if (!state.cpu_flag) {
/* Calculate the amount of padding required to make the output vertically aligned */
int length = strlen(state.current_test_name);
va_list arg;
va_start(arg, name);
length += vsnprintf(NULL, 0, name, arg);
va_end(arg);
if (length > max_length)
max_length = length;
}
}
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