forked from OSchip/llvm-project
179 lines
6.8 KiB
C++
179 lines
6.8 KiB
C++
//===--- Warnings.cpp - C-Language Front-end ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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#include "clang/Frontend/Utils.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Sema/SemaDiagnostic.h"
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#include "clang/Lex/LexDiagnostic.h"
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#include "clang/Frontend/DiagnosticOptions.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include <cstring>
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#include <utility>
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#include <algorithm>
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using namespace clang;
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// EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning opts
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static void EmitUnknownDiagWarning(DiagnosticsEngine &Diags,
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StringRef Prefix, StringRef Opt,
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bool isPositive) {
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StringRef Suggestion = DiagnosticIDs::getNearestWarningOption(Opt);
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if (!Suggestion.empty())
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Diags.Report(isPositive? diag::warn_unknown_warning_option_suggest :
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diag::warn_unknown_negative_warning_option_suggest)
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<< (Prefix.str() += Opt) << (Prefix.str() += Suggestion);
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else
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Diags.Report(isPositive? diag::warn_unknown_warning_option :
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diag::warn_unknown_negative_warning_option)
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<< (Prefix.str() += Opt);
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}
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void clang::ProcessWarningOptions(DiagnosticsEngine &Diags,
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const DiagnosticOptions &Opts) {
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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(
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static_cast<DiagnosticsEngine::OverloadsShown>(Opts.ShowOverloads));
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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 -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(DiagnosticsEngine::Ext_Error);
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else if (Opts.Pedantic)
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Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Warn);
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else
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Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Ignore);
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llvm::SmallVector<diag::kind, 10> _Diags;
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const llvm::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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for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) {
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StringRef Opt = Opts.Warnings[i];
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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::Mapping Mapping = isPositive ? diag::MAP_WARNING : diag::MAP_IGNORE;
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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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Diags.setEnableAllWarnings(true);
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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 and -Werror-foo.
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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] != '=' && Opt[5] != '-') || Opt.size() == 6) {
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if (Report)
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Diags.Report(diag::warn_unknown_warning_specifier)
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<< "-Werror" << ("-W" + Opt.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(Specifier, _Diags)) {
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EmitUnknownDiagWarning(Diags, "-Werror=", Specifier, isPositive);
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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" + Opt.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(Specifier, _Diags)) {
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EmitUnknownDiagWarning(Diags, "-Wfatal-errors=", Specifier,
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isPositive);
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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(Opt, _Diags))
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EmitUnknownDiagWarning(Diags, "-W", Opt, isPositive);
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} else {
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Diags.setDiagnosticGroupMapping(Opt, Mapping);
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}
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}
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}
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}
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