1 files changed, 147 insertions, 0 deletions
diff --git a/tools/diagtool/ShowEnabledWarnings.cpp b/tools/diagtool/ShowEnabledWarnings.cpp
new file mode 100644
index 0000000000..2bc5124e61
--- /dev/null
+++ b/tools/diagtool/ShowEnabledWarnings.cpp
@@ -0,0 +1,147 @@
+//===- ShowEnabledWarnings - diagtool tool for printing enabled flags -----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DiagTool.h"
+#include "DiagnosticNames.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/TextDiagnosticBuffer.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Frontend/Utils.h"
+#include "llvm/Support/TargetSelect.h"
+
+DEF_DIAGTOOL("show-enabled",
+             "Show which warnings are enabled for a given command line",
+             ShowEnabledWarnings)
+
+using namespace clang;
+
+namespace {
+  struct PrettyDiag {
+    StringRef Name;
+    StringRef Flag;
+    DiagnosticsEngine::Level Level;
+
+    PrettyDiag(StringRef name, StringRef flag, DiagnosticsEngine::Level level)
+    : Name(name), Flag(flag), Level(level) {}
+
+    bool operator<(const PrettyDiag &x) const { return Name < x.Name; }
+  };
+}
+
+static void printUsage() {
+  llvm::errs() << "Usage: diagtool show-enabled [<flags>] <single-input.c>\n";
+}
+
+static char getCharForLevel(DiagnosticsEngine::Level Level) {
+  switch (Level) {
+  case DiagnosticsEngine::Ignored: return ' ';
+  case DiagnosticsEngine::Note:    return '-';
+  case DiagnosticsEngine::Warning: return 'W';
+  case DiagnosticsEngine::Error:   return 'E';
+  case DiagnosticsEngine::Fatal:   return 'F';
+  }
+
+  llvm_unreachable("Unknown diagnostic level");
+}
+
+static IntrusiveRefCntPtr<DiagnosticsEngine>
+createDiagnostics(unsigned int argc, char **argv) {
+  IntrusiveRefCntPtr<DiagnosticIDs> DiagIDs(new DiagnosticIDs());
+
+  // Buffer diagnostics from argument parsing so that we can output them using a
+  // well formed diagnostic object.
+  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
+  IntrusiveRefCntPtr<DiagnosticsEngine> InterimDiags(
+    new DiagnosticsEngine(DiagIDs, DiagsBuffer));
+
+  // Try to build a CompilerInvocation.
+  OwningPtr<CompilerInvocation> Invocation(
+    createInvocationFromCommandLine(ArrayRef<const char *>(argv, argc),
+                                    InterimDiags));
+  if (!Invocation)
+    return NULL;
+
+  // Build the diagnostics parser
+  IntrusiveRefCntPtr<DiagnosticsEngine> FinalDiags =
+    CompilerInstance::createDiagnostics(Invocation->getDiagnosticOpts(),
+                                        argc, argv);
+  if (!FinalDiags)
+    return NULL;
+  
+  // Flush any errors created when initializing everything. This could happen
+  // for invalid command lines, which will probably give non-sensical results.
+  DiagsBuffer->FlushDiagnostics(*FinalDiags);
+
+  return FinalDiags;
+}
+
+int ShowEnabledWarnings::run(unsigned int argc, char **argv, raw_ostream &Out) {
+  // First check our one flag (--levels).
+  bool ShouldShowLevels = true;
+  if (argc > 0) {
+    StringRef FirstArg(*argv);
+    if (FirstArg.equals("--no-levels")) {
+      ShouldShowLevels = false;
+      --argc;
+      ++argv;
+    } else if (FirstArg.equals("--levels")) {
+      ShouldShowLevels = true;
+      --argc;
+      ++argv;
+    }
+  }
+
+  // Create the diagnostic engine.
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags = createDiagnostics(argc, argv);
+  if (!Diags) {
+    printUsage();
+    return EXIT_FAILURE;
+  }
+
+  // Now we have our diagnostics. Iterate through EVERY diagnostic and see
+  // which ones are turned on.
+  // FIXME: It would be very nice to print which flags are turning on which
+  // diagnostics, but this can be done with a diff.
+  std::vector<PrettyDiag> Active;
+
+  for (const diagtool::DiagnosticRecord *I = diagtool::BuiltinDiagnostics,
+       *E = I + diagtool::BuiltinDiagnosticsCount; I != E; ++I) {
+    unsigned DiagID = I->DiagID;
+    
+    if (DiagnosticIDs::isBuiltinNote(DiagID))
+      continue;
+    
+    if (!DiagnosticIDs::isBuiltinWarningOrExtension(DiagID))
+      continue;
+
+    DiagnosticsEngine::Level DiagLevel =
+      Diags->getDiagnosticLevel(DiagID, SourceLocation());
+    if (DiagLevel == DiagnosticsEngine::Ignored)
+      continue;
+
+    StringRef WarningOpt = DiagnosticIDs::getWarningOptionForDiag(DiagID);
+    Active.push_back(PrettyDiag(I->getName(), WarningOpt, DiagLevel));
+  }
+
+  std::sort(Active.begin(), Active.end());
+
+  // Print them all out.
+  for (std::vector<PrettyDiag>::const_iterator I = Active.begin(),
+       E = Active.end(); I != E; ++I) {
+    if (ShouldShowLevels)
+      Out << getCharForLevel(I->Level) << "  ";
+    Out << I->Name;
+    if (!I->Flag.empty())
+      Out << " [-W" << I->Flag << "]";
+    Out << '\n';
+  }
+
+  return EXIT_SUCCESS;
+}