Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 1 | //===--- Warnings.cpp - C-Language Front-end ------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // Command line warning options handler. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | // |
| 14 | // This file is responsible for handling all warning options. This includes |
| 15 | // a number of -Wfoo options and their variants, which are driven by TableGen- |
Chris Lattner | a3b089e | 2009-12-23 18:53:37 +0000 | [diff] [blame] | 16 | // generated data, and the special cases -pedantic, -pedantic-errors, -w, |
| 17 | // -Werror and -Wfatal-errors. |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 18 | // |
Sebastian Redl | c5613db | 2009-03-07 12:09:25 +0000 | [diff] [blame] | 19 | // Each warning option controls any number of actual warnings. |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 20 | // Given a warning option 'foo', the following are valid: |
Chris Lattner | a3b089e | 2009-12-23 18:53:37 +0000 | [diff] [blame] | 21 | // -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 22 | // |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame^] | 23 | #include "clang/Basic/AllDiagnostics.h" |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 24 | #include "clang/Basic/Diagnostic.h" |
Douglas Gregor | 02c23eb | 2012-10-23 22:26:28 +0000 | [diff] [blame] | 25 | #include "clang/Basic/DiagnosticOptions.h" |
Chandler Carruth | 55fc873 | 2012-12-04 09:13:33 +0000 | [diff] [blame] | 26 | #include <algorithm> |
Eli Friedman | ac8d629 | 2009-05-19 04:30:57 +0000 | [diff] [blame] | 27 | #include <cstring> |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 28 | #include <utility> |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 29 | using namespace clang; |
| 30 | |
Chad Rosier | 588e83b | 2012-01-31 19:31:12 +0000 | [diff] [blame] | 31 | // EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning |
| 32 | // opts |
Chad Rosier | 99643d9 | 2011-11-15 19:03:03 +0000 | [diff] [blame] | 33 | static void EmitUnknownDiagWarning(DiagnosticsEngine &Diags, |
Benjamin Kramer | dce6327 | 2011-11-15 12:26:39 +0000 | [diff] [blame] | 34 | StringRef Prefix, StringRef Opt, |
| 35 | bool isPositive) { |
| 36 | StringRef Suggestion = DiagnosticIDs::getNearestWarningOption(Opt); |
| 37 | if (!Suggestion.empty()) |
| 38 | Diags.Report(isPositive? diag::warn_unknown_warning_option_suggest : |
| 39 | diag::warn_unknown_negative_warning_option_suggest) |
| 40 | << (Prefix.str() += Opt) << (Prefix.str() += Suggestion); |
| 41 | else |
| 42 | Diags.Report(isPositive? diag::warn_unknown_warning_option : |
| 43 | diag::warn_unknown_negative_warning_option) |
| 44 | << (Prefix.str() += Opt); |
| 45 | } |
| 46 | |
David Blaikie | d6471f7 | 2011-09-25 23:23:43 +0000 | [diff] [blame] | 47 | void clang::ProcessWarningOptions(DiagnosticsEngine &Diags, |
Chad Rosier | 08e79d2 | 2013-01-15 01:21:53 +0000 | [diff] [blame] | 48 | const DiagnosticOptions &Opts, |
| 49 | bool ReportDiags) { |
Chris Lattner | 27ceb9d | 2009-04-15 07:01:18 +0000 | [diff] [blame] | 50 | Diags.setSuppressSystemWarnings(true); // Default to -Wno-system-headers |
Daniel Dunbar | 6907943 | 2009-11-12 07:28:44 +0000 | [diff] [blame] | 51 | Diags.setIgnoreAllWarnings(Opts.IgnoreWarnings); |
Douglas Gregor | dc7b641 | 2012-10-23 23:11:23 +0000 | [diff] [blame] | 52 | Diags.setShowOverloads(Opts.getShowOverloads()); |
Richard Trieu | 246b6aa | 2012-06-26 18:18:47 +0000 | [diff] [blame] | 53 | |
| 54 | Diags.setElideType(Opts.ElideType); |
| 55 | Diags.setPrintTemplateTree(Opts.ShowTemplateTree); |
| 56 | Diags.setShowColors(Opts.ShowColors); |
| 57 | |
Chris Lattner | c100214 | 2010-04-07 20:37:06 +0000 | [diff] [blame] | 58 | // Handle -ferror-limit |
| 59 | if (Opts.ErrorLimit) |
| 60 | Diags.setErrorLimit(Opts.ErrorLimit); |
Douglas Gregor | 575cf37 | 2010-04-20 07:18:24 +0000 | [diff] [blame] | 61 | if (Opts.TemplateBacktraceLimit) |
| 62 | Diags.setTemplateBacktraceLimit(Opts.TemplateBacktraceLimit); |
Richard Smith | 08d6e03 | 2011-12-16 19:06:07 +0000 | [diff] [blame] | 63 | if (Opts.ConstexprBacktraceLimit) |
| 64 | Diags.setConstexprBacktraceLimit(Opts.ConstexprBacktraceLimit); |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 65 | |
Chris Lattner | b54b276 | 2009-04-16 05:04:32 +0000 | [diff] [blame] | 66 | // If -pedantic or -pedantic-errors was specified, then we want to map all |
| 67 | // extension diagnostics onto WARNING or ERROR unless the user has futz'd |
| 68 | // around with them explicitly. |
Daniel Dunbar | 6907943 | 2009-11-12 07:28:44 +0000 | [diff] [blame] | 69 | if (Opts.PedanticErrors) |
David Blaikie | d6471f7 | 2011-09-25 23:23:43 +0000 | [diff] [blame] | 70 | Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Error); |
Daniel Dunbar | 6907943 | 2009-11-12 07:28:44 +0000 | [diff] [blame] | 71 | else if (Opts.Pedantic) |
David Blaikie | d6471f7 | 2011-09-25 23:23:43 +0000 | [diff] [blame] | 72 | Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Warn); |
Chris Lattner | b54b276 | 2009-04-16 05:04:32 +0000 | [diff] [blame] | 73 | else |
David Blaikie | d6471f7 | 2011-09-25 23:23:43 +0000 | [diff] [blame] | 74 | Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Ignore); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 75 | |
Dmitri Gribenko | cfa88f8 | 2013-01-12 19:30:44 +0000 | [diff] [blame] | 76 | SmallVector<diag::kind, 10> _Diags; |
Dylan Noblesmith | c93dc78 | 2012-02-20 14:00:23 +0000 | [diff] [blame] | 77 | const IntrusiveRefCntPtr< DiagnosticIDs > DiagIDs = |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 78 | Diags.getDiagnosticIDs(); |
| 79 | // We parse the warning options twice. The first pass sets diagnostic state, |
| 80 | // while the second pass reports warnings/errors. This has the effect that |
| 81 | // we follow the more canonical "last option wins" paradigm when there are |
| 82 | // conflicting options. |
| 83 | for (unsigned Report = 0, ReportEnd = 2; Report != ReportEnd; ++Report) { |
| 84 | bool SetDiagnostic = (Report == 0); |
Chad Rosier | 08e79d2 | 2013-01-15 01:21:53 +0000 | [diff] [blame] | 85 | |
| 86 | // If we've set the diagnostic state and are not reporting diagnostics then |
| 87 | // we're done. |
| 88 | if (!SetDiagnostic && !ReportDiags) |
| 89 | break; |
| 90 | |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 91 | for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) { |
| 92 | StringRef Opt = Opts.Warnings[i]; |
Chad Rosier | ff1affe | 2012-05-16 19:28:02 +0000 | [diff] [blame] | 93 | StringRef OrigOpt = Opts.Warnings[i]; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 94 | |
Hans Wennborg | c876946 | 2012-01-17 09:30:38 +0000 | [diff] [blame] | 95 | // Treat -Wformat=0 as an alias for -Wno-format. |
| 96 | if (Opt == "format=0") |
| 97 | Opt = "no-format"; |
| 98 | |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 99 | // Check to see if this warning starts with "no-", if so, this is a |
| 100 | // negative form of the option. |
| 101 | bool isPositive = true; |
| 102 | if (Opt.startswith("no-")) { |
| 103 | isPositive = false; |
| 104 | Opt = Opt.substr(3); |
Chris Lattner | 5147e8e | 2009-04-15 04:27:38 +0000 | [diff] [blame] | 105 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 106 | |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 107 | // Figure out how this option affects the warning. If -Wfoo, map the |
| 108 | // diagnostic to a warning, if -Wno-foo, map it to ignore. |
| 109 | diag::Mapping Mapping = isPositive ? diag::MAP_WARNING : diag::MAP_IGNORE; |
| 110 | |
| 111 | // -Wsystem-headers is a special case, not driven by the option table. It |
| 112 | // cannot be controlled with -Werror. |
| 113 | if (Opt == "system-headers") { |
| 114 | if (SetDiagnostic) |
| 115 | Diags.setSuppressSystemWarnings(!isPositive); |
Chris Lattner | 5147e8e | 2009-04-15 04:27:38 +0000 | [diff] [blame] | 116 | continue; |
| 117 | } |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 118 | |
| 119 | // -Weverything is a special case as well. It implicitly enables all |
| 120 | // warnings, including ones not explicitly in a warning group. |
| 121 | if (Opt == "everything") { |
Argyrios Kyrtzidis | 11583c7 | 2012-01-27 06:15:43 +0000 | [diff] [blame] | 122 | if (SetDiagnostic) { |
| 123 | if (isPositive) { |
| 124 | Diags.setEnableAllWarnings(true); |
| 125 | } else { |
| 126 | Diags.setEnableAllWarnings(false); |
| 127 | Diags.setMappingToAllDiagnostics(diag::MAP_IGNORE); |
| 128 | } |
| 129 | } |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 130 | continue; |
| 131 | } |
| 132 | |
| 133 | // -Werror/-Wno-error is a special case, not controlled by the option |
| 134 | // table. It also has the "specifier" form of -Werror=foo and -Werror-foo. |
| 135 | if (Opt.startswith("error")) { |
| 136 | StringRef Specifier; |
| 137 | if (Opt.size() > 5) { // Specifier must be present. |
| 138 | if ((Opt[5] != '=' && Opt[5] != '-') || Opt.size() == 6) { |
| 139 | if (Report) |
| 140 | Diags.Report(diag::warn_unknown_warning_specifier) |
Chad Rosier | ff1affe | 2012-05-16 19:28:02 +0000 | [diff] [blame] | 141 | << "-Werror" << ("-W" + OrigOpt.str()); |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 142 | continue; |
| 143 | } |
| 144 | Specifier = Opt.substr(6); |
| 145 | } |
| 146 | |
| 147 | if (Specifier.empty()) { |
| 148 | if (SetDiagnostic) |
| 149 | Diags.setWarningsAsErrors(isPositive); |
| 150 | continue; |
| 151 | } |
| 152 | |
| 153 | if (SetDiagnostic) { |
| 154 | // Set the warning as error flag for this specifier. |
| 155 | Diags.setDiagnosticGroupWarningAsError(Specifier, isPositive); |
| 156 | } else if (DiagIDs->getDiagnosticsInGroup(Specifier, _Diags)) { |
Benjamin Kramer | 4e96944 | 2011-11-28 22:17:09 +0000 | [diff] [blame] | 157 | EmitUnknownDiagWarning(Diags, "-Werror=", Specifier, isPositive); |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 158 | } |
| 159 | continue; |
| 160 | } |
| 161 | |
| 162 | // -Wfatal-errors is yet another special case. |
| 163 | if (Opt.startswith("fatal-errors")) { |
| 164 | StringRef Specifier; |
| 165 | if (Opt.size() != 12) { |
| 166 | if ((Opt[12] != '=' && Opt[12] != '-') || Opt.size() == 13) { |
| 167 | if (Report) |
| 168 | Diags.Report(diag::warn_unknown_warning_specifier) |
Chad Rosier | ff1affe | 2012-05-16 19:28:02 +0000 | [diff] [blame] | 169 | << "-Wfatal-errors" << ("-W" + OrigOpt.str()); |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 170 | continue; |
| 171 | } |
| 172 | Specifier = Opt.substr(13); |
| 173 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 174 | |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 175 | if (Specifier.empty()) { |
| 176 | if (SetDiagnostic) |
| 177 | Diags.setErrorsAsFatal(isPositive); |
| 178 | continue; |
| 179 | } |
| 180 | |
| 181 | if (SetDiagnostic) { |
| 182 | // Set the error as fatal flag for this specifier. |
| 183 | Diags.setDiagnosticGroupErrorAsFatal(Specifier, isPositive); |
| 184 | } else if (DiagIDs->getDiagnosticsInGroup(Specifier, _Diags)) { |
Benjamin Kramer | 4e96944 | 2011-11-28 22:17:09 +0000 | [diff] [blame] | 185 | EmitUnknownDiagWarning(Diags, "-Wfatal-errors=", Specifier, |
| 186 | isPositive); |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 187 | } |
| 188 | continue; |
| 189 | } |
| 190 | |
Chad Rosier | 496cc8e | 2011-11-15 18:57:32 +0000 | [diff] [blame] | 191 | if (Report) { |
| 192 | if (DiagIDs->getDiagnosticsInGroup(Opt, _Diags)) |
Chad Rosier | 6a1fd4a | 2012-05-16 19:42:03 +0000 | [diff] [blame] | 193 | EmitUnknownDiagWarning(Diags, isPositive ? "-W" : "-Wno-", Opt, |
| 194 | isPositive); |
Chad Rosier | 05272a6 | 2011-11-03 21:23:39 +0000 | [diff] [blame] | 195 | } else { |
| 196 | Diags.setDiagnosticGroupMapping(Opt, Mapping); |
Daniel Dunbar | 4aa8f2b | 2011-09-29 00:53:47 +0000 | [diff] [blame] | 197 | } |
Daniel Dunbar | 4aa8f2b | 2011-09-29 00:53:47 +0000 | [diff] [blame] | 198 | } |
Chris Lattner | 27ceb9d | 2009-04-15 07:01:18 +0000 | [diff] [blame] | 199 | } |
Sebastian Redl | 63a9e0f | 2009-03-06 17:41:35 +0000 | [diff] [blame] | 200 | } |