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1 //===--- Warnings.cpp - C-Language Front-end ------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // Command line warning options handler.
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10 //
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11 //===----------------------------------------------------------------------===//
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12 //
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13 // This file is responsible for handling all warning options. This includes
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14 // a number of -Wfoo options and their variants, which are driven by TableGen-
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15 // generated data, and the special cases -pedantic, -pedantic-errors, -w,
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16 // -Werror and -Wfatal-errors.
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17 //
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18 // Each warning option controls any number of actual warnings.
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19 // Given a warning option 'foo', the following are valid:
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20 // -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo
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21 //
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22 // Remark options are also handled here, analogously, except that they are much
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23 // simpler because a remark can't be promoted to an error.
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24 #include "clang/Basic/AllDiagnostics.h"
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25 #include "clang/Basic/Diagnostic.h"
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26 #include "clang/Basic/DiagnosticOptions.h"
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27 #include <algorithm>
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28 #include <cstring>
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29 #include <utility>
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30 using namespace clang;
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31
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32 // EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning
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33 // opts
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34 static void EmitUnknownDiagWarning(DiagnosticsEngine &Diags,
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35 diag::Flavor Flavor, StringRef Prefix,
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36 StringRef Opt) {
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37 StringRef Suggestion = DiagnosticIDs::getNearestOption(Flavor, Opt);
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38 Diags.Report(diag::warn_unknown_diag_option)
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39 << (Flavor == diag::Flavor::WarningOrError ? 0 : 1)
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40 << (Prefix.str() += std::string(Opt)) << !Suggestion.empty()
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41 << (Prefix.str() += std::string(Suggestion));
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42 }
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43
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44 void clang::ProcessWarningOptions(DiagnosticsEngine &Diags,
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45 const DiagnosticOptions &Opts,
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46 bool ReportDiags) {
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47 Diags.setSuppressSystemWarnings(true); // Default to -Wno-system-headers
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48 Diags.setIgnoreAllWarnings(Opts.IgnoreWarnings);
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49 Diags.setShowOverloads(Opts.getShowOverloads());
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50
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51 Diags.setElideType(Opts.ElideType);
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52 Diags.setPrintTemplateTree(Opts.ShowTemplateTree);
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53 Diags.setShowColors(Opts.ShowColors);
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54
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55 // Handle -ferror-limit
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56 if (Opts.ErrorLimit)
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57 Diags.setErrorLimit(Opts.ErrorLimit);
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58 if (Opts.TemplateBacktraceLimit)
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59 Diags.setTemplateBacktraceLimit(Opts.TemplateBacktraceLimit);
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60 if (Opts.ConstexprBacktraceLimit)
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61 Diags.setConstexprBacktraceLimit(Opts.ConstexprBacktraceLimit);
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62
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63 // If -pedantic or -pedantic-errors was specified, then we want to map all
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64 // extension diagnostics onto WARNING or ERROR unless the user has futz'd
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65 // around with them explicitly.
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66 if (Opts.PedanticErrors)
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67 Diags.setExtensionHandlingBehavior(diag::Severity::Error);
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68 else if (Opts.Pedantic)
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69 Diags.setExtensionHandlingBehavior(diag::Severity::Warning);
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70 else
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71 Diags.setExtensionHandlingBehavior(diag::Severity::Ignored);
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72
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73 SmallVector<diag::kind, 10> _Diags;
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74 const IntrusiveRefCntPtr< DiagnosticIDs > DiagIDs =
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75 Diags.getDiagnosticIDs();
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76 // We parse the warning options twice. The first pass sets diagnostic state,
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77 // while the second pass reports warnings/errors. This has the effect that
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78 // we follow the more canonical "last option wins" paradigm when there are
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79 // conflicting options.
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80 for (unsigned Report = 0, ReportEnd = 2; Report != ReportEnd; ++Report) {
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81 bool SetDiagnostic = (Report == 0);
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82
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83 // If we've set the diagnostic state and are not reporting diagnostics then
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84 // we're done.
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85 if (!SetDiagnostic && !ReportDiags)
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86 break;
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87
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88 for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) {
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89 const auto Flavor = diag::Flavor::WarningOrError;
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90 StringRef Opt = Opts.Warnings[i];
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91 StringRef OrigOpt = Opts.Warnings[i];
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92
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93 // Treat -Wformat=0 as an alias for -Wno-format.
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94 if (Opt == "format=0")
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95 Opt = "no-format";
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96
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97 // Check to see if this warning starts with "no-", if so, this is a
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98 // negative form of the option.
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99 bool isPositive = true;
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100 if (Opt.startswith("no-")) {
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101 isPositive = false;
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102 Opt = Opt.substr(3);
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103 }
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104
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105 // Figure out how this option affects the warning. If -Wfoo, map the
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106 // diagnostic to a warning, if -Wno-foo, map it to ignore.
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107 diag::Severity Mapping =
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108 isPositive ? diag::Severity::Warning : diag::Severity::Ignored;
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109
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110 // -Wsystem-headers is a special case, not driven by the option table. It
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111 // cannot be controlled with -Werror.
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112 if (Opt == "system-headers") {
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113 if (SetDiagnostic)
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114 Diags.setSuppressSystemWarnings(!isPositive);
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115 continue;
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116 }
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117
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118 // -Weverything is a special case as well. It implicitly enables all
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119 // warnings, including ones not explicitly in a warning group.
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120 if (Opt == "everything") {
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121 if (SetDiagnostic) {
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122 if (isPositive) {
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123 Diags.setEnableAllWarnings(true);
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124 } else {
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125 Diags.setEnableAllWarnings(false);
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126 Diags.setSeverityForAll(Flavor, diag::Severity::Ignored);
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127 }
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128 }
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129 continue;
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130 }
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131
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132 // -Werror/-Wno-error is a special case, not controlled by the option
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221
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133 // table. It also has the "specifier" form of -Werror=foo. GCC supports
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134 // the deprecated -Werror-implicit-function-declaration which is used by
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135 // a few projects.
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150
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136 if (Opt.startswith("error")) {
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137 StringRef Specifier;
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138 if (Opt.size() > 5) { // Specifier must be present.
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221
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139 if (Opt[5] != '=' &&
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140 Opt.substr(5) != "-implicit-function-declaration") {
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150
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141 if (Report)
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142 Diags.Report(diag::warn_unknown_warning_specifier)
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143 << "-Werror" << ("-W" + OrigOpt.str());
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144 continue;
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145 }
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146 Specifier = Opt.substr(6);
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147 }
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148
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149 if (Specifier.empty()) {
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150 if (SetDiagnostic)
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151 Diags.setWarningsAsErrors(isPositive);
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152 continue;
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153 }
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154
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155 if (SetDiagnostic) {
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156 // Set the warning as error flag for this specifier.
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157 Diags.setDiagnosticGroupWarningAsError(Specifier, isPositive);
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158 } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) {
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159 EmitUnknownDiagWarning(Diags, Flavor, "-Werror=", Specifier);
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160 }
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161 continue;
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162 }
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163
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164 // -Wfatal-errors is yet another special case.
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165 if (Opt.startswith("fatal-errors")) {
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166 StringRef Specifier;
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167 if (Opt.size() != 12) {
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168 if ((Opt[12] != '=' && Opt[12] != '-') || Opt.size() == 13) {
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169 if (Report)
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170 Diags.Report(diag::warn_unknown_warning_specifier)
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171 << "-Wfatal-errors" << ("-W" + OrigOpt.str());
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172 continue;
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173 }
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174 Specifier = Opt.substr(13);
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175 }
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176
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177 if (Specifier.empty()) {
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178 if (SetDiagnostic)
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179 Diags.setErrorsAsFatal(isPositive);
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180 continue;
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181 }
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182
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183 if (SetDiagnostic) {
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184 // Set the error as fatal flag for this specifier.
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185 Diags.setDiagnosticGroupErrorAsFatal(Specifier, isPositive);
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186 } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) {
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187 EmitUnknownDiagWarning(Diags, Flavor, "-Wfatal-errors=", Specifier);
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188 }
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189 continue;
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190 }
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191
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192 if (Report) {
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193 if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags))
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194 EmitUnknownDiagWarning(Diags, Flavor, isPositive ? "-W" : "-Wno-",
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195 Opt);
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196 } else {
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197 Diags.setSeverityForGroup(Flavor, Opt, Mapping);
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198 }
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199 }
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200
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201 for (unsigned i = 0, e = Opts.Remarks.size(); i != e; ++i) {
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202 StringRef Opt = Opts.Remarks[i];
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203 const auto Flavor = diag::Flavor::Remark;
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204
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205 // Check to see if this warning starts with "no-", if so, this is a
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206 // negative form of the option.
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207 bool IsPositive = !Opt.startswith("no-");
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208 if (!IsPositive) Opt = Opt.substr(3);
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209
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210 auto Severity = IsPositive ? diag::Severity::Remark
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211 : diag::Severity::Ignored;
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212
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213 // -Reverything sets the state of all remarks. Note that all remarks are
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214 // in remark groups, so we don't need a separate 'all remarks enabled'
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215 // flag.
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216 if (Opt == "everything") {
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217 if (SetDiagnostic)
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218 Diags.setSeverityForAll(Flavor, Severity);
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219 continue;
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220 }
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221
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222 if (Report) {
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223 if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags))
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224 EmitUnknownDiagWarning(Diags, Flavor, IsPositive ? "-R" : "-Rno-",
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225 Opt);
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226 } else {
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227 Diags.setSeverityForGroup(Flavor, Opt,
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228 IsPositive ? diag::Severity::Remark
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229 : diag::Severity::Ignored);
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230 }
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231 }
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232 }
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233 }
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