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111
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1 /* ztest.c -- Test for libbacktrace inflate code.
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2 Copyright (C) 2017 Free Software Foundation, Inc.
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3 Written by Ian Lance Taylor, Google.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are
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7 met:
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8
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9 (1) Redistributions of source code must retain the above copyright
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10 notice, this list of conditions and the following disclaimer.
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11
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12 (2) Redistributions in binary form must reproduce the above copyright
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13 notice, this list of conditions and the following disclaimer in
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14 the documentation and/or other materials provided with the
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15 distribution.
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16
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17 (3) The name of the author may not be used to
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18 endorse or promote products derived from this software without
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19 specific prior written permission.
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20
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21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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31 POSSIBILITY OF SUCH DAMAGE. */
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32
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33 #include "config.h"
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34
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35 #include <errno.h>
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36 #include <stdio.h>
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37 #include <stdlib.h>
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38 #include <string.h>
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39 #include <time.h>
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40 #include <sys/types.h>
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41 #include <sys/stat.h>
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42
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43 #ifdef HAVE_ZLIB
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44 #include <zlib.h>
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45 #endif
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46
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47 #include "backtrace.h"
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48 #include "backtrace-supported.h"
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49
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50 #include "internal.h"
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51 #include "testlib.h"
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52
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53 #ifndef HAVE_CLOCK_GETTIME
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54
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55 typedef int xclockid_t;
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56
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57 static int
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58 xclock_gettime (xclockid_t id ATTRIBUTE_UNUSED,
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59 struct timespec *ts ATTRIBUTE_UNUSED)
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60 {
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61 errno = EINVAL;
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62 return -1;
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63 }
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64
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65 #define clockid_t xclockid_t
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66 #define clock_gettime xclock_gettime
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67 #undef CLOCK_REALTIME
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68 #define CLOCK_REALTIME 0
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69
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70 #endif /* !defined(HAVE_CLOCK_GETTIME) */
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71
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72 #ifdef CLOCK_PROCESS_CPUTIME_ID
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73 #define ZLIB_CLOCK_GETTIME_ARG CLOCK_PROCESS_CPUTIME_ID
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74 #else
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75 #define ZLIB_CLOCK_GETTIME_ARG CLOCK_REALTIME
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76 #endif
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77
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78 /* Some tests for the local zlib inflation code. */
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79
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80 struct zlib_test
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81 {
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82 const char *name;
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83 const char *uncompressed;
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84 const char *compressed;
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85 size_t compressed_len;
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86 };
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87
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88 /* Error callback. */
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89
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90 static void
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91 error_callback_compress (void *vdata, const char *msg, int errnum)
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92 {
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93 fprintf (stderr, "%s", msg);
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94 if (errnum > 0)
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95 fprintf (stderr, ": %s", strerror (errnum));
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96 fprintf (stderr, "\n");
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97 exit (EXIT_FAILURE);
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98 }
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99
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100 static const struct zlib_test tests[] =
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101 {
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102 {
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103 "empty",
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104 "",
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105 "\x78\x9c\x03\x00\x00\x00\x00\x01",
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106 8,
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107 },
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108 {
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109 "hello",
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110 "hello, world\n",
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111 ("\x78\x9c\xca\x48\xcd\xc9\xc9\xd7\x51\x28\xcf"
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112 "\x2f\xca\x49\xe1\x02\x04\x00\x00\xff\xff\x21\xe7\x04\x93"),
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113 25,
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114 },
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115 {
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116 "goodbye",
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117 "goodbye, world",
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118 ("\x78\x9c\x4b\xcf\xcf\x4f\x49\xaa"
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119 "\x4c\xd5\x51\x28\xcf\x2f\xca\x49"
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120 "\x01\x00\x28\xa5\x05\x5e"),
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121 22,
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122 }
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123 };
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124
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125 /* Test the hand coded samples. */
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126
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127 static void
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128 test_samples (struct backtrace_state *state)
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129 {
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130 size_t i;
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131
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132 for (i = 0; i < sizeof tests / sizeof tests[0]; ++i)
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133 {
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134 char *p;
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135 size_t v;
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136 size_t j;
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137 unsigned char *uncompressed;
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138 size_t uncompressed_len;
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139
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140 p = malloc (12 + tests[i].compressed_len);
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141 memcpy (p, "ZLIB", 4);
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142 v = strlen (tests[i].uncompressed);
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143 for (j = 0; j < 8; ++j)
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144 p[j + 4] = (v >> ((7 - j) * 8)) & 0xff;
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145 memcpy (p + 12, tests[i].compressed, tests[i].compressed_len);
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146 uncompressed = NULL;
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147 uncompressed_len = 0;
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148 if (!backtrace_uncompress_zdebug (state, (unsigned char *) p,
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149 tests[i].compressed_len + 12,
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150 error_callback_compress, NULL,
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151 &uncompressed, &uncompressed_len))
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152 {
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153 fprintf (stderr, "test %s: uncompress failed\n", tests[i].name);
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154 ++failures;
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155 }
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156 else
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157 {
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158 if (uncompressed_len != v)
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159 {
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160 fprintf (stderr,
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161 "test %s: got uncompressed length %zu, want %zu\n",
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162 tests[i].name, uncompressed_len, v);
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163 ++failures;
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164 }
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165 else if (memcmp (tests[i].uncompressed, uncompressed, v) != 0)
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166 {
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167 size_t j;
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168
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169 fprintf (stderr, "test %s: uncompressed data mismatch\n",
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170 tests[i].name);
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171 for (j = 0; j < v; ++j)
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172 if (tests[i].uncompressed[j] != uncompressed[j])
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173 fprintf (stderr, " %zu: got %#x want %#x\n", j,
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174 uncompressed[j], tests[i].uncompressed[j]);
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175 ++failures;
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176 }
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177 else
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178 printf ("PASS: inflate %s\n", tests[i].name);
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179
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180 backtrace_free (state, uncompressed, uncompressed_len,
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181 error_callback_compress, NULL);
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182 }
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183 }
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184 }
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185
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186 #ifdef HAVE_ZLIB
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187
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188 /* Given a set of TRIALS timings, discard the lowest and highest
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189 values and return the mean average of the rest. */
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190
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191 static size_t
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192 average_time (const size_t *times, size_t trials)
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193 {
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194 size_t imax;
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195 size_t max;
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196 size_t imin;
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197 size_t min;
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198 size_t i;
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199 size_t sum;
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200
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201 imin = 0;
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202 imax = 0;
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203 min = times[0];
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204 max = times[0];
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205 for (i = 1; i < trials; ++i)
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206 {
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207 if (times[i] < min)
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208 {
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209 imin = i;
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210 min = times[i];
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211 }
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212 if (times[i] > max)
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213 {
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214 imax = i;
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215 max = times[i];
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216 }
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217 }
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218
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219 sum = 0;
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220 for (i = 0; i < trials; ++i)
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221 {
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222 if (i != imax && i != imin)
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223 sum += times[i];
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224 }
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225 return sum / (trials - 2);
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226 }
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227
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228 #endif
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229
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230 /* Test a larger text, if available. */
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231
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232 static void
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233 test_large (struct backtrace_state *state)
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234 {
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235 #ifdef HAVE_ZLIB
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236 unsigned char *orig_buf;
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237 size_t orig_bufsize;
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238 size_t i;
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239 char *compressed_buf;
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240 size_t compressed_bufsize;
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241 unsigned long compress_sizearg;
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242 unsigned char *uncompressed_buf;
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243 size_t uncompressed_bufsize;
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244 int r;
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245 clockid_t cid;
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246 struct timespec ts1;
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247 struct timespec ts2;
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248 size_t ctime;
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249 size_t ztime;
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250 const size_t trials = 16;
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251 size_t ctimes[16];
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252 size_t ztimes[16];
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253 static const char * const names[] = {
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254 "Mark.Twain-Tom.Sawyer.txt",
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255 "../libgo/go/compress/testdata/Mark.Twain-Tom.Sawyer.txt"
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256 };
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257
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258 orig_buf = NULL;
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259 orig_bufsize = 0;
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260 uncompressed_buf = NULL;
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261 compressed_buf = NULL;
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262
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263 for (i = 0; i < sizeof names / sizeof names[0]; ++i)
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264 {
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265 size_t len;
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266 char *namebuf;
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267 FILE *e;
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268 struct stat st;
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269 char *rbuf;
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270 size_t got;
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271
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272 len = strlen (SRCDIR) + strlen (names[i]) + 2;
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273 namebuf = malloc (len);
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274 if (namebuf == NULL)
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275 {
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276 perror ("malloc");
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277 goto fail;
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278 }
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279 snprintf (namebuf, len, "%s/%s", SRCDIR, names[i]);
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280 e = fopen (namebuf, "r");
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281 free (namebuf);
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282 if (e == NULL)
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283 continue;
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284 if (fstat (fileno (e), &st) < 0)
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285 {
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286 perror ("fstat");
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287 fclose (e);
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288 continue;
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289 }
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290 rbuf = malloc (st.st_size);
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291 if (rbuf == NULL)
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292 {
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293 perror ("malloc");
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294 goto fail;
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295 }
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296 got = fread (rbuf, 1, st.st_size, e);
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297 fclose (e);
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298 if (got > 0)
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299 {
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300 orig_buf = rbuf;
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301 orig_bufsize = got;
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302 break;
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303 }
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304 free (rbuf);
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305 }
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306
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307 if (orig_buf == NULL)
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308 {
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309 /* We couldn't find an input file. */
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310 printf ("UNSUPPORTED: inflate large\n");
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311 return;
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312 }
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313
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314 compressed_bufsize = compressBound (orig_bufsize) + 12;
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315 compressed_buf = malloc (compressed_bufsize);
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316 if (compressed_buf == NULL)
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317 {
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318 perror ("malloc");
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319 goto fail;
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320 }
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321
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322 compress_sizearg = compressed_bufsize - 12;
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323 r = compress (compressed_buf + 12, &compress_sizearg,
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324 orig_buf, orig_bufsize);
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325 if (r != Z_OK)
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326 {
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327 fprintf (stderr, "zlib compress failed: %d\n", r);
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328 goto fail;
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329 }
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330
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331 compressed_bufsize = compress_sizearg + 12;
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332
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333 /* Prepare the header that our library expects. */
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334 memcpy (compressed_buf, "ZLIB", 4);
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335 for (i = 0; i < 8; ++i)
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336 compressed_buf[i + 4] = (orig_bufsize >> ((7 - i) * 8)) & 0xff;
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337
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338 uncompressed_buf = malloc (orig_bufsize);
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339 if (uncompressed_buf == NULL)
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340 {
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341 perror ("malloc");
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342 goto fail;
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343 }
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344 uncompressed_bufsize = orig_bufsize;
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345
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346 if (!backtrace_uncompress_zdebug (state, compressed_buf, compressed_bufsize,
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347 error_callback_compress, NULL,
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348 &uncompressed_buf, &uncompressed_bufsize))
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349 {
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350 fprintf (stderr, "inflate large: backtrace_uncompress_zdebug failed\n");
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351 goto fail;
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352 }
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353
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354 if (uncompressed_bufsize != orig_bufsize)
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355 {
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356 fprintf (stderr,
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357 "inflate large: got uncompressed length %zu, want %zu\n",
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358 uncompressed_bufsize, orig_bufsize);
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359 goto fail;
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360 }
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361
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362 if (memcmp (uncompressed_buf, orig_buf, uncompressed_bufsize) != 0)
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363 {
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364 fprintf (stderr, "inflate large: uncompressed data mismatch\n");
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365 goto fail;
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366 }
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367
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368 printf ("PASS: inflate large\n");
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369
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370 for (i = 0; i < trials; ++i)
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371 {
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372 unsigned long uncompress_sizearg;
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373
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374 cid = ZLIB_CLOCK_GETTIME_ARG;
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375 if (clock_gettime (cid, &ts1) < 0)
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376 {
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377 if (errno == EINVAL)
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378 return;
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379 perror ("clock_gettime");
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380 return;
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381 }
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382
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383 if (!backtrace_uncompress_zdebug (state, compressed_buf,
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384 compressed_bufsize,
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385 error_callback_compress, NULL,
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386 &uncompressed_buf,
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387 &uncompressed_bufsize))
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388 {
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389 fprintf (stderr,
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390 ("inflate large: "
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391 "benchmark backtrace_uncompress_zdebug failed\n"));
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392 return;
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393 }
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394
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395 if (clock_gettime (cid, &ts2) < 0)
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396 {
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397 perror ("clock_gettime");
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398 return;
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399 }
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400
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401 ctime = (ts2.tv_sec - ts1.tv_sec) * 1000000000;
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402 ctime += ts2.tv_nsec - ts1.tv_nsec;
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403 ctimes[i] = ctime;
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404
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405 if (clock_gettime (cid, &ts1) < 0)
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406 {
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407 perror("clock_gettime");
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408 return;
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409 }
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410
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411 uncompress_sizearg = uncompressed_bufsize;
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412 r = uncompress (uncompressed_buf, &uncompress_sizearg,
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413 compressed_buf + 12, compressed_bufsize - 12);
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414
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415 if (clock_gettime (cid, &ts2) < 0)
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416 {
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417 perror ("clock_gettime");
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418 return;
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419 }
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420
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421 if (r != Z_OK)
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422 {
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423 fprintf (stderr,
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424 "inflate large: benchmark zlib uncompress failed: %d\n",
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425 r);
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426 return;
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427 }
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428
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429 ztime = (ts2.tv_sec - ts1.tv_sec) * 1000000000;
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430 ztime += ts2.tv_nsec - ts1.tv_nsec;
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431 ztimes[i] = ztime;
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432 }
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433
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434 /* Toss the highest and lowest times and average the rest. */
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435 ctime = average_time (ctimes, trials);
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436 ztime = average_time (ztimes, trials);
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437
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438 printf ("backtrace: %zu ns\n", ctime);
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439 printf ("zlib : %zu ns\n", ztime);
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440 printf ("ratio : %g\n", (double) ztime / (double) ctime);
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441
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442 return;
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443
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444 fail:
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445 printf ("FAIL: inflate large\n");
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446 ++failures;
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447
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448 if (orig_buf != NULL)
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449 free (orig_buf);
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450 if (compressed_buf != NULL)
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451 free (compressed_buf);
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452 if (uncompressed_buf != NULL)
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453 free (uncompressed_buf);
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454
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455 #else /* !HAVE_ZLIB */
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456
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457 printf ("UNSUPPORTED: inflate large\n");
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458
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459 #endif /* !HAVE_ZLIB */
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460 }
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461
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462 int
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463 main (int argc ATTRIBUTE_UNUSED, char **argv)
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464 {
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465 struct backtrace_state *state;
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466
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467 state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
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468 error_callback_create, NULL);
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469
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470 test_samples (state);
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471 test_large (state);
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472
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473 exit (failures != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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474 }
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