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Diffstat (limited to 'clang/lib/Basic/Warnings.cpp')
| -rw-r--r-- | clang/lib/Basic/Warnings.cpp | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/clang/lib/Basic/Warnings.cpp b/clang/lib/Basic/Warnings.cpp new file mode 100644 index 000000000000..88ef2eaa6589 --- /dev/null +++ b/clang/lib/Basic/Warnings.cpp @@ -0,0 +1,229 @@ +//===--- Warnings.cpp - C-Language Front-end ------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// Command line warning options handler. +// +//===----------------------------------------------------------------------===// +// +// This file is responsible for handling all warning options. This includes +// a number of -Wfoo options and their variants, which are driven by TableGen- +// generated data, and the special cases -pedantic, -pedantic-errors, -w, +// -Werror and -Wfatal-errors. +// +// Each warning option controls any number of actual warnings. +// Given a warning option 'foo', the following are valid: +// -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo +// +// Remark options are also handled here, analogously, except that they are much +// simpler because a remark can't be promoted to an error. +#include "clang/Basic/AllDiagnostics.h" +#include "clang/Basic/Diagnostic.h" +#include "clang/Basic/DiagnosticOptions.h" +#include <algorithm> +#include <cstring> +#include <utility> +using namespace clang; + +// EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning +// opts +static void EmitUnknownDiagWarning(DiagnosticsEngine &Diags, + diag::Flavor Flavor, StringRef Prefix, + StringRef Opt) { + StringRef Suggestion = DiagnosticIDs::getNearestOption(Flavor, Opt); + Diags.Report(diag::warn_unknown_diag_option) + << (Flavor == diag::Flavor::WarningOrError ? 0 : 1) << (Prefix.str() += Opt) + << !Suggestion.empty() << (Prefix.str() += Suggestion); +} + +void clang::ProcessWarningOptions(DiagnosticsEngine &Diags, + const DiagnosticOptions &Opts, + bool ReportDiags) { + Diags.setSuppressSystemWarnings(true); // Default to -Wno-system-headers + Diags.setIgnoreAllWarnings(Opts.IgnoreWarnings); + Diags.setShowOverloads(Opts.getShowOverloads()); + + Diags.setElideType(Opts.ElideType); + Diags.setPrintTemplateTree(Opts.ShowTemplateTree); + Diags.setShowColors(Opts.ShowColors); + + // Handle -ferror-limit + if (Opts.ErrorLimit) + Diags.setErrorLimit(Opts.ErrorLimit); + if (Opts.TemplateBacktraceLimit) + Diags.setTemplateBacktraceLimit(Opts.TemplateBacktraceLimit); + if (Opts.ConstexprBacktraceLimit) + Diags.setConstexprBacktraceLimit(Opts.ConstexprBacktraceLimit); + + // If -pedantic or -pedantic-errors was specified, then we want to map all + // extension diagnostics onto WARNING or ERROR unless the user has futz'd + // around with them explicitly. + if (Opts.PedanticErrors) + Diags.setExtensionHandlingBehavior(diag::Severity::Error); + else if (Opts.Pedantic) + Diags.setExtensionHandlingBehavior(diag::Severity::Warning); + else + Diags.setExtensionHandlingBehavior(diag::Severity::Ignored); + + SmallVector<diag::kind, 10> _Diags; + const IntrusiveRefCntPtr< DiagnosticIDs > DiagIDs = + Diags.getDiagnosticIDs(); + // We parse the warning options twice. The first pass sets diagnostic state, + // while the second pass reports warnings/errors. This has the effect that + // we follow the more canonical "last option wins" paradigm when there are + // conflicting options. + for (unsigned Report = 0, ReportEnd = 2; Report != ReportEnd; ++Report) { + bool SetDiagnostic = (Report == 0); + + // If we've set the diagnostic state and are not reporting diagnostics then + // we're done. + if (!SetDiagnostic && !ReportDiags) + break; + + for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) { + const auto Flavor = diag::Flavor::WarningOrError; + StringRef Opt = Opts.Warnings[i]; + StringRef OrigOpt = Opts.Warnings[i]; + + // Treat -Wformat=0 as an alias for -Wno-format. + if (Opt == "format=0") + Opt = "no-format"; + + // Check to see if this warning starts with "no-", if so, this is a + // negative form of the option. + bool isPositive = true; + if (Opt.startswith("no-")) { + isPositive = false; + Opt = Opt.substr(3); + } + + // Figure out how this option affects the warning. If -Wfoo, map the + // diagnostic to a warning, if -Wno-foo, map it to ignore. + diag::Severity Mapping = + isPositive ? diag::Severity::Warning : diag::Severity::Ignored; + + // -Wsystem-headers is a special case, not driven by the option table. It + // cannot be controlled with -Werror. + if (Opt == "system-headers") { + if (SetDiagnostic) + Diags.setSuppressSystemWarnings(!isPositive); + continue; + } + + // -Weverything is a special case as well. It implicitly enables all + // warnings, including ones not explicitly in a warning group. + if (Opt == "everything") { + if (SetDiagnostic) { + if (isPositive) { + Diags.setEnableAllWarnings(true); + } else { + Diags.setEnableAllWarnings(false); + Diags.setSeverityForAll(Flavor, diag::Severity::Ignored); + } + } + continue; + } + + // -Werror/-Wno-error is a special case, not controlled by the option + // table. It also has the "specifier" form of -Werror=foo and -Werror-foo. + if (Opt.startswith("error")) { + StringRef Specifier; + if (Opt.size() > 5) { // Specifier must be present. + if ((Opt[5] != '=' && Opt[5] != '-') || Opt.size() == 6) { + if (Report) + Diags.Report(diag::warn_unknown_warning_specifier) + << "-Werror" << ("-W" + OrigOpt.str()); + continue; + } + Specifier = Opt.substr(6); + } + + if (Specifier.empty()) { + if (SetDiagnostic) + Diags.setWarningsAsErrors(isPositive); + continue; + } + + if (SetDiagnostic) { + // Set the warning as error flag for this specifier. + Diags.setDiagnosticGroupWarningAsError(Specifier, isPositive); + } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) { + EmitUnknownDiagWarning(Diags, Flavor, "-Werror=", Specifier); + } + continue; + } + + // -Wfatal-errors is yet another special case. + if (Opt.startswith("fatal-errors")) { + StringRef Specifier; + if (Opt.size() != 12) { + if ((Opt[12] != '=' && Opt[12] != '-') || Opt.size() == 13) { + if (Report) + Diags.Report(diag::warn_unknown_warning_specifier) + << "-Wfatal-errors" << ("-W" + OrigOpt.str()); + continue; + } + Specifier = Opt.substr(13); + } + + if (Specifier.empty()) { + if (SetDiagnostic) + Diags.setErrorsAsFatal(isPositive); + continue; + } + + if (SetDiagnostic) { + // Set the error as fatal flag for this specifier. + Diags.setDiagnosticGroupErrorAsFatal(Specifier, isPositive); + } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) { + EmitUnknownDiagWarning(Diags, Flavor, "-Wfatal-errors=", Specifier); + } + continue; + } + + if (Report) { + if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags)) + EmitUnknownDiagWarning(Diags, Flavor, isPositive ? "-W" : "-Wno-", + Opt); + } else { + Diags.setSeverityForGroup(Flavor, Opt, Mapping); + } + } + + for (unsigned i = 0, e = Opts.Remarks.size(); i != e; ++i) { + StringRef Opt = Opts.Remarks[i]; + const auto Flavor = diag::Flavor::Remark; + + // Check to see if this warning starts with "no-", if so, this is a + // negative form of the option. + bool IsPositive = !Opt.startswith("no-"); + if (!IsPositive) Opt = Opt.substr(3); + + auto Severity = IsPositive ? diag::Severity::Remark + : diag::Severity::Ignored; + + // -Reverything sets the state of all remarks. Note that all remarks are + // in remark groups, so we don't need a separate 'all remarks enabled' + // flag. + if (Opt == "everything") { + if (SetDiagnostic) + Diags.setSeverityForAll(Flavor, Severity); + continue; + } + + if (Report) { + if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags)) + EmitUnknownDiagWarning(Diags, Flavor, IsPositive ? "-R" : "-Rno-", + Opt); + } else { + Diags.setSeverityForGroup(Flavor, Opt, + IsPositive ? diag::Severity::Remark + : diag::Severity::Ignored); + } + } + } +} |