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1 // go-diagnostics.cc -- Go error/warning diagnostics utilities.
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2
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3 // Copyright 2016 The Go Authors. All rights reserved.
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4 // Use of this source code is governed by a BSD-style
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5 // license that can be found in the LICENSE file.
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6
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7 #include "go-diagnostics.h"
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8
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9 static std::string
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10 mformat_value()
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11 {
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12 return std::string(xstrerror(errno));
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13 }
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14
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15 // Rewrite a format string to expand any extensions not
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16 // supported by sprintf(). See comments in go-diagnostics.h
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17 // for list of supported format specifiers.
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18
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19 static std::string
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20 expand_format(const char* fmt)
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21 {
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22 std::stringstream ss;
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23 for (const char* c = fmt; *c; ++c)
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24 {
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25 if (*c != '%')
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26 {
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27 ss << *c;
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28 continue;
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29 }
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30 c++;
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31 switch (*c)
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32 {
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33 case '\0':
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34 {
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35 // malformed format string
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36 go_unreachable();
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37 }
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38 case '%':
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39 {
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40 ss << "%";
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41 break;
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42 }
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43 case 'm':
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44 {
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45 ss << mformat_value();
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46 break;
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47 }
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48 case '<':
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49 {
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50 ss << go_open_quote();
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51 break;
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52 }
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53 case '>':
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54 {
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55 ss << go_close_quote();
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56 break;
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57 }
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58 case 'q':
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59 {
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60 ss << go_open_quote();
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61 c++;
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62 if (*c == 'm')
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63 {
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64 ss << mformat_value();
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65 }
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66 else
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67 {
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68 ss << "%" << *c;
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69 }
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70 ss << go_close_quote();
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71 break;
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72 }
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73 default:
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74 {
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75 ss << "%" << *c;
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76 }
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77 }
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78 }
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79 return ss.str();
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80 }
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81
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82 // Expand message format specifiers, using a combination of
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83 // expand_format above to handle extensions (ex: %m, %q) and vasprintf()
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84 // to handle regular printf-style formatting. A pragma is being used here to
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85 // suppress this warning:
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86 //
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87 // warning: function ‘std::__cxx11::string expand_message(const char*, __va_list_tag*)’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
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88 //
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89 // What appears to be happening here is that the checker is deciding that
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90 // because of the call to vasprintf() (which has attribute gnu_printf), the
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91 // calling function must need to have attribute gnu_printf as well, even
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92 // though there is already an attribute declaration for it.
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93
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94 static std::string
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95 expand_message(const char* fmt, va_list ap) GO_ATTRIBUTE_GCC_DIAG(1,0);
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96
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97 #pragma GCC diagnostic push
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98 #pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
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99
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100 static std::string
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101 expand_message(const char* fmt, va_list ap)
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102 {
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103 char* mbuf = 0;
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104 std::string expanded_fmt = expand_format(fmt);
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105 int nwr = vasprintf(&mbuf, expanded_fmt.c_str(), ap);
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106 if (nwr == -1)
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107 {
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108 // memory allocation failed
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109 go_be_error_at(Linemap::unknown_location(),
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110 "memory allocation failed in vasprintf");
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111 go_assert(0);
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112 }
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113 std::string rval = std::string(mbuf);
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114 free(mbuf);
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115 return rval;
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116 }
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117
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118 #pragma GCC diagnostic pop
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119
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120 static const char* cached_open_quote = NULL;
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121 static const char* cached_close_quote = NULL;
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122
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123 const char*
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124 go_open_quote()
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125 {
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126 if (cached_open_quote == NULL)
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127 go_be_get_quotechars(&cached_open_quote, &cached_close_quote);
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128 return cached_open_quote;
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129 }
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130
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131 const char*
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132 go_close_quote()
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133 {
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134 if (cached_close_quote == NULL)
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135 go_be_get_quotechars(&cached_open_quote, &cached_close_quote);
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136 return cached_close_quote;
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137 }
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138
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139 void
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140 go_error_at(const Location location, const char* fmt, ...)
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141 {
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142 va_list ap;
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143
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144 va_start(ap, fmt);
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145 go_be_error_at(location, expand_message(fmt, ap));
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146 va_end(ap);
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147 }
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148
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149 void
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150 go_warning_at(const Location location, int opt, const char* fmt, ...)
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151 {
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152 va_list ap;
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153
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154 va_start(ap, fmt);
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155 go_be_warning_at(location, opt, expand_message(fmt, ap));
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156 va_end(ap);
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157 }
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158
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159 void
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160 go_fatal_error(const Location location, const char* fmt, ...)
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161 {
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162 va_list ap;
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163
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164 va_start(ap, fmt);
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165 go_be_fatal_error(location, expand_message(fmt, ap));
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166 va_end(ap);
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167 }
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168
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169 void
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170 go_inform(const Location location, const char* fmt, ...)
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171 {
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172 va_list ap;
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173
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174 va_start(ap, fmt);
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175 go_be_inform(location, expand_message(fmt, ap));
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176 va_end(ap);
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177 }
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