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