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annotate projects/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc @ 214:0cf2d4ade63d

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 13 Jul 2021 09:53:52 +0900
parents f476a9ba4795
children
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1 //===-- sanitizer_printf.cc -----------------------------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file is shared between AddressSanitizer and ThreadSanitizer.
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11 //
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12 // Internal printf function, used inside run-time libraries.
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13 // We can't use libc printf because we intercept some of the functions used
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14 // inside it.
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15 //===----------------------------------------------------------------------===//
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16
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17 #include "sanitizer_common.h"
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18 #include "sanitizer_flags.h"
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19 #include "sanitizer_libc.h"
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20
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21 #include <stdio.h>
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22 #include <stdarg.h>
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23
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24 #if SANITIZER_WINDOWS && defined(_MSC_VER) && _MSC_VER < 1800 && \
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25 !defined(va_copy)
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26 # define va_copy(dst, src) ((dst) = (src))
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27 #endif
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28
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29 namespace __sanitizer {
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30
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31 static int AppendChar(char **buff, const char *buff_end, char c) {
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32 if (*buff < buff_end) {
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33 **buff = c;
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34 (*buff)++;
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35 }
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36 return 1;
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37 }
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38
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39 // Appends number in a given base to buffer. If its length is less than
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40 // |minimal_num_length|, it is padded with leading zeroes or spaces, depending
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41 // on the value of |pad_with_zero|.
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42 static int AppendNumber(char **buff, const char *buff_end, u64 absolute_value,
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43 u8 base, u8 minimal_num_length, bool pad_with_zero,
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44 bool negative, bool uppercase) {
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45 uptr const kMaxLen = 30;
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46 RAW_CHECK(base == 10 || base == 16);
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47 RAW_CHECK(base == 10 || !negative);
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48 RAW_CHECK(absolute_value || !negative);
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49 RAW_CHECK(minimal_num_length < kMaxLen);
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50 int result = 0;
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51 if (negative && minimal_num_length)
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52 --minimal_num_length;
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53 if (negative && pad_with_zero)
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54 result += AppendChar(buff, buff_end, '-');
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55 uptr num_buffer[kMaxLen];
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56 int pos = 0;
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57 do {
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58 RAW_CHECK_MSG((uptr)pos < kMaxLen, "AppendNumber buffer overflow");
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59 num_buffer[pos++] = absolute_value % base;
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60 absolute_value /= base;
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61 } while (absolute_value > 0);
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62 if (pos < minimal_num_length) {
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63 // Make sure compiler doesn't insert call to memset here.
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64 internal_memset(&num_buffer[pos], 0,
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65 sizeof(num_buffer[0]) * (minimal_num_length - pos));
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66 pos = minimal_num_length;
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67 }
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68 RAW_CHECK(pos > 0);
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69 pos--;
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70 for (; pos >= 0 && num_buffer[pos] == 0; pos--) {
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71 char c = (pad_with_zero || pos == 0) ? '0' : ' ';
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72 result += AppendChar(buff, buff_end, c);
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73 }
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74 if (negative && !pad_with_zero) result += AppendChar(buff, buff_end, '-');
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75 for (; pos >= 0; pos--) {
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76 char digit = static_cast<char>(num_buffer[pos]);
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77 digit = (digit < 10) ? '0' + digit : (uppercase ? 'A' : 'a') + digit - 10;
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78 result += AppendChar(buff, buff_end, digit);
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79 }
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80 return result;
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81 }
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82
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83 static int AppendUnsigned(char **buff, const char *buff_end, u64 num, u8 base,
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84 u8 minimal_num_length, bool pad_with_zero,
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85 bool uppercase) {
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86 return AppendNumber(buff, buff_end, num, base, minimal_num_length,
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87 pad_with_zero, false /* negative */, uppercase);
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88 }
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89
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90 static int AppendSignedDecimal(char **buff, const char *buff_end, s64 num,
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91 u8 minimal_num_length, bool pad_with_zero) {
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92 bool negative = (num < 0);
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93 return AppendNumber(buff, buff_end, (u64)(negative ? -num : num), 10,
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94 minimal_num_length, pad_with_zero, negative,
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95 false /* uppercase */);
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96 }
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97
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98 static int AppendString(char **buff, const char *buff_end, int precision,
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99 const char *s) {
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100 if (!s)
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101 s = "<null>";
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102 int result = 0;
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103 for (; *s; s++) {
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104 if (precision >= 0 && result >= precision)
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105 break;
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106 result += AppendChar(buff, buff_end, *s);
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107 }
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108 return result;
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109 }
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110
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111 static int AppendPointer(char **buff, const char *buff_end, u64 ptr_value) {
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112 int result = 0;
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113 result += AppendString(buff, buff_end, -1, "0x");
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114 result += AppendUnsigned(buff, buff_end, ptr_value, 16,
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115 SANITIZER_POINTER_FORMAT_LENGTH,
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116 true /* pad_with_zero */, false /* uppercase */);
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117 return result;
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118 }
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119
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120 int VSNPrintf(char *buff, int buff_length,
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121 const char *format, va_list args) {
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122 static const char *kPrintfFormatsHelp =
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123 "Supported Printf formats: %([0-9]*)?(z|ll)?{d,u,x,X}; %p; %(\\.\\*)?s; "
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124 "%c\n";
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125 RAW_CHECK(format);
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126 RAW_CHECK(buff_length > 0);
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127 const char *buff_end = &buff[buff_length - 1];
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128 const char *cur = format;
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129 int result = 0;
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130 for (; *cur; cur++) {
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131 if (*cur != '%') {
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132 result += AppendChar(&buff, buff_end, *cur);
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133 continue;
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134 }
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135 cur++;
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136 bool have_width = (*cur >= '0' && *cur <= '9');
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137 bool pad_with_zero = (*cur == '0');
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138 int width = 0;
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139 if (have_width) {
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140 while (*cur >= '0' && *cur <= '9') {
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141 width = width * 10 + *cur++ - '0';
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142 }
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143 }
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144 bool have_precision = (cur[0] == '.' && cur[1] == '*');
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145 int precision = -1;
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146 if (have_precision) {
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147 cur += 2;
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148 precision = va_arg(args, int);
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149 }
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150 bool have_z = (*cur == 'z');
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151 cur += have_z;
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152 bool have_ll = !have_z && (cur[0] == 'l' && cur[1] == 'l');
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153 cur += have_ll * 2;
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154 s64 dval;
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155 u64 uval;
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156 bool have_flags = have_width | have_z | have_ll;
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157 // Only %s supports precision for now
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158 CHECK(!(precision >= 0 && *cur != 's'));
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159 switch (*cur) {
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160 case 'd': {
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161 dval = have_ll ? va_arg(args, s64)
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162 : have_z ? va_arg(args, sptr)
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163 : va_arg(args, int);
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164 result += AppendSignedDecimal(&buff, buff_end, dval, width,
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165 pad_with_zero);
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166 break;
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167 }
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168 case 'u':
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169 case 'x':
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170 case 'X': {
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171 uval = have_ll ? va_arg(args, u64)
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172 : have_z ? va_arg(args, uptr)
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173 : va_arg(args, unsigned);
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174 bool uppercase = (*cur == 'X');
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175 result += AppendUnsigned(&buff, buff_end, uval, (*cur == 'u') ? 10 : 16,
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176 width, pad_with_zero, uppercase);
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177 break;
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178 }
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179 case 'p': {
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180 RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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181 result += AppendPointer(&buff, buff_end, va_arg(args, uptr));
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182 break;
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183 }
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184 case 's': {
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185 RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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186 result += AppendString(&buff, buff_end, precision, va_arg(args, char*));
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187 break;
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188 }
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189 case 'c': {
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190 RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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191 result += AppendChar(&buff, buff_end, va_arg(args, int));
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192 break;
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193 }
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194 case '%' : {
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195 RAW_CHECK_MSG(!have_flags, kPrintfFormatsHelp);
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196 result += AppendChar(&buff, buff_end, '%');
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197 break;
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198 }
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199 default: {
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200 RAW_CHECK_MSG(false, kPrintfFormatsHelp);
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201 }
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202 }
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203 }
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204 RAW_CHECK(buff <= buff_end);
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205 AppendChar(&buff, buff_end + 1, '\0');
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206 return result;
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207 }
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208
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209 static void (*PrintfAndReportCallback)(const char *);
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210 void SetPrintfAndReportCallback(void (*callback)(const char *)) {
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211 PrintfAndReportCallback = callback;
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212 }
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213
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214 // Can be overriden in frontend.
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215 #if SANITIZER_GO && defined(TSAN_EXTERNAL_HOOKS)
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216 // Implementation must be defined in frontend.
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217 extern "C" void OnPrint(const char *str);
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218 #else
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219 SANITIZER_INTERFACE_WEAK_DEF(void, OnPrint, const char *str) {
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220 (void)str;
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221 }
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222 #endif
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223
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224 static void CallPrintfAndReportCallback(const char *str) {
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225 OnPrint(str);
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226 if (PrintfAndReportCallback)
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227 PrintfAndReportCallback(str);
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228 }
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229
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230 static void NOINLINE SharedPrintfCodeNoBuffer(bool append_pid,
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231 char *local_buffer,
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232 int buffer_size,
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233 const char *format,
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234 va_list args) {
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235 va_list args2;
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236 va_copy(args2, args);
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237 const int kLen = 16 * 1024;
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238 int needed_length;
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239 char *buffer = local_buffer;
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240 // First try to print a message using a local buffer, and then fall back to
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241 // mmaped buffer.
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242 for (int use_mmap = 0; use_mmap < 2; use_mmap++) {
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243 if (use_mmap) {
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244 va_end(args);
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245 va_copy(args, args2);
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246 buffer = (char*)MmapOrDie(kLen, "Report");
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247 buffer_size = kLen;
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248 }
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249 needed_length = 0;
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250 // Check that data fits into the current buffer.
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251 # define CHECK_NEEDED_LENGTH \
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252 if (needed_length >= buffer_size) { \
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253 if (!use_mmap) continue; \
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254 RAW_CHECK_MSG(needed_length < kLen, \
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255 "Buffer in Report is too short!\n"); \
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256 }
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257 // Fuchsia's logging infrastructure always keeps track of the logging
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258 // process, thread, and timestamp, so never prepend such information.
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259 if (!SANITIZER_FUCHSIA && append_pid) {
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260 int pid = internal_getpid();
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261 const char *exe_name = GetProcessName();
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262 if (common_flags()->log_exe_name && exe_name) {
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263 needed_length += internal_snprintf(buffer, buffer_size,
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264 "==%s", exe_name);
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265 CHECK_NEEDED_LENGTH
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266 }
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267 needed_length += internal_snprintf(
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268 buffer + needed_length, buffer_size - needed_length, "==%d==", pid);
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269 CHECK_NEEDED_LENGTH
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270 }
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271 needed_length += VSNPrintf(buffer + needed_length,
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272 buffer_size - needed_length, format, args);
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273 CHECK_NEEDED_LENGTH
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274 // If the message fit into the buffer, print it and exit.
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275 break;
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276 # undef CHECK_NEEDED_LENGTH
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277 }
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278 RawWrite(buffer);
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279
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280 // Remove color sequences from the message.
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281 RemoveANSIEscapeSequencesFromString(buffer);
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282 CallPrintfAndReportCallback(buffer);
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283 LogMessageOnPrintf(buffer);
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284
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285 // If we had mapped any memory, clean up.
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286 if (buffer != local_buffer)
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287 UnmapOrDie((void *)buffer, buffer_size);
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288 va_end(args2);
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289 }
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290
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291 static void NOINLINE SharedPrintfCode(bool append_pid, const char *format,
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292 va_list args) {
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293 // |local_buffer| is small enough not to overflow the stack and/or violate
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294 // the stack limit enforced by TSan (-Wframe-larger-than=512). On the other
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295 // hand, the bigger the buffer is, the more the chance the error report will
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296 // fit into it.
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297 char local_buffer[400];
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298 SharedPrintfCodeNoBuffer(append_pid, local_buffer, ARRAY_SIZE(local_buffer),
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299 format, args);
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300 }
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301
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302 FORMAT(1, 2)
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303 void Printf(const char *format, ...) {
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304 va_list args;
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305 va_start(args, format);
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306 SharedPrintfCode(false, format, args);
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307 va_end(args);
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308 }
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309
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310 // Like Printf, but prints the current PID before the output string.
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311 FORMAT(1, 2)
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312 void Report(const char *format, ...) {
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313 va_list args;
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314 va_start(args, format);
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315 SharedPrintfCode(true, format, args);
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316 va_end(args);
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317 }
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318
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319 // Writes at most "length" symbols to "buffer" (including trailing '\0').
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320 // Returns the number of symbols that should have been written to buffer
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321 // (not including trailing '\0'). Thus, the string is truncated
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322 // iff return value is not less than "length".
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323 FORMAT(3, 4)
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324 int internal_snprintf(char *buffer, uptr length, const char *format, ...) {
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325 va_list args;
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326 va_start(args, format);
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327 int needed_length = VSNPrintf(buffer, length, format, args);
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328 va_end(args);
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329 return needed_length;
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330 }
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331
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332 FORMAT(2, 3)
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333 void InternalScopedString::append(const char *format, ...) {
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334 CHECK_LT(length_, size());
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335 va_list args;
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336 va_start(args, format);
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337 VSNPrintf(data() + length_, size() - length_, format, args);
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338 va_end(args);
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339 length_ += internal_strlen(data() + length_);
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340 CHECK_LT(length_, size());
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341 }
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342
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343 } // namespace __sanitizer