Update Clang for 3.5 rebase (r209713).
Change-Id: I8c9133b0f8f776dc915f270b60f94962e771bc83
diff --git a/lib/Basic/Warnings.cpp b/lib/Basic/Warnings.cpp
new file mode 100644
index 0000000..b09e69a
--- /dev/null
+++ b/lib/Basic/Warnings.cpp
@@ -0,0 +1,200 @@
+//===--- Warnings.cpp - C-Language Front-end ------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+#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,
+ StringRef Prefix, StringRef Opt,
+ bool isPositive) {
+ StringRef Suggestion = DiagnosticIDs::getNearestWarningOption(Opt);
+ if (!Suggestion.empty())
+ Diags.Report(isPositive? diag::warn_unknown_warning_option_suggest :
+ diag::warn_unknown_negative_warning_option_suggest)
+ << (Prefix.str() += Opt) << (Prefix.str() += Suggestion);
+ else
+ Diags.Report(isPositive? diag::warn_unknown_warning_option :
+ diag::warn_unknown_negative_warning_option)
+ << (Prefix.str() += Opt);
+}
+
+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(DiagnosticsEngine::Ext_Error);
+ else if (Opts.Pedantic)
+ Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Warn);
+ else
+ Diags.setExtensionHandlingBehavior(DiagnosticsEngine::Ext_Ignore);
+
+ 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) {
+ 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::Mapping Mapping = isPositive ? diag::MAP_WARNING : diag::MAP_IGNORE;
+
+ // -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.setMappingToAllDiagnostics(diag::MAP_IGNORE);
+ }
+ }
+ 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(Specifier, _Diags)) {
+ EmitUnknownDiagWarning(Diags, "-Werror=", Specifier, isPositive);
+ }
+ 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(Specifier, _Diags)) {
+ EmitUnknownDiagWarning(Diags, "-Wfatal-errors=", Specifier,
+ isPositive);
+ }
+ continue;
+ }
+
+ if (Report) {
+ if (DiagIDs->getDiagnosticsInGroup(Opt, _Diags))
+ EmitUnknownDiagWarning(Diags, isPositive ? "-W" : "-Wno-", Opt,
+ isPositive);
+ } else {
+ Diags.setDiagnosticGroupMapping(Opt, Mapping);
+ }
+ }
+ }
+}