Add initial implementation of a TableGen backend for converting Clang-warnings

tablegen files to the original .def preprocessor include files. This is my first
TableGen backend; I don't claim that it is awesome.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66971 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 127 insertions, 2 deletions

diff --git a/utils/TableGen/CMakeLists.txt b/utils/TableGen/CMakeLists.txt
index 8e6a3e1222..71dd72fc6e 100644
--- a/utils/TableGen/CMakeLists.txt
+++ b/utils/TableGen/CMakeLists.txt
@@ -19,6 +19,7 @@ add_executable(tblgen
   TableGen.cpp
   TableGenBackend.cpp
   FastISelEmitter.cpp
+  ClangDiagnosticsEmitter.cpp
   )
 
 target_link_libraries(tblgen LLVMSupport LLVMSystem)
diff --git a/utils/TableGen/ClangDiagnosticsEmitter.cpp b/utils/TableGen/ClangDiagnosticsEmitter.cpp
new file mode 100644
index 0000000000..fa139e7729
--- /dev/null
+++ b/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -0,0 +1,84 @@
+//=- ClangDiagnosticsEmitter.cpp - Generate Clang diagnostics tables -*- C++ -*-
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// These tablegen backends emit Clang diagnostics tables.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ClangDiagnosticsEmitter.h"
+#include "Record.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/ADT/VectorExtras.h"
+
+using namespace llvm;
+typedef std::vector<Record*> RecordVector;
+typedef std::vector<Record*> SuperClassVector;
+typedef std::vector<RecordVal> RecordValVector;
+
+static const RecordVal* findRecordVal(const RecordValVector& Vals,
+                                      const std::string &key) {
+  for (RecordValVector::const_iterator I=Vals.begin(), E=Vals.end(); I!=E; ++I)
+    if ((*I).getName() == key)
+      return &*I;
+  
+  return 0;
+}
+
+static const Record* getDiagKind(const Record* DiagClass, const Record &R) {  
+  const SuperClassVector &SC = R.getSuperClasses();
+  for (SuperClassVector::const_iterator I=SC.begin(), E=SC.end(); I!=E; ++I)
+    if ((*I)->isSubClassOf(DiagClass))
+      return *I;
+  
+  return 0;
+}
+
+static void EmitEscaped(std::ostream& OS, const std::string &s) {
+  for (std::string::const_iterator I=s.begin(), E=s.end(); I!=E; ++I)
+    switch (*I) {
+      default: OS << *I; break;
+      case '\"': OS << "\\" << *I; break;
+      case '\\': OS << "\\\\"; break;
+    }
+}
+
+static void ProcessDiag(std::ostream& OS, const Record* DiagClass,
+                        const Record& R) {
+
+  const Record* DiagKind = getDiagKind(DiagClass, R);
+  if (!DiagKind)
+    return;
+
+  OS << "DIAG(" << R.getName() << ", ";
+  
+  const std::string &s = DiagKind->getName();
+  for (std::string::const_iterator I=s.begin(), E=s.end(); I!=E; ++I)
+    OS << char(toupper(*I));
+  
+  const RecordVal* Text = findRecordVal(R.getValues(), "Text");
+  assert(Text && "No 'Text' entry in Diagnostic.");
+  const StringInit* TextVal = dynamic_cast<const StringInit*>(Text->getValue());
+  assert(TextVal && "Value 'Text' must be a string.");
+  OS << ", \"";
+  EmitEscaped(OS, TextVal->getValue());
+  OS << "\")\n";
+}
+
+void ClangDiagsDefsEmitter::run(std::ostream &OS) {
+  const RecordVector &Diags = Records.getAllDerivedDefinitions("Diagnostic");
+  
+  const Record* DiagClass = Records.getClass("Diagnostic");
+  assert(DiagClass && "No Diagnostic class defined.");  
+  
+  for (RecordVector::const_iterator I=Diags.begin(), E=Diags.end(); I!=E; ++I) {
+    // FIXME: Compare the component.
+    ProcessDiag(OS, DiagClass, **I);
+  }
+}
\ No newline at end of file
diff --git a/utils/TableGen/ClangDiagnosticsEmitter.h b/utils/TableGen/ClangDiagnosticsEmitter.h
new file mode 100644
index 0000000000..93979708b0
--- /dev/null
+++ b/utils/TableGen/ClangDiagnosticsEmitter.h
@@ -0,0 +1,35 @@
+//===- ClangDiagnosticsEmitter.h - Generate Clang diagnostics tables -*- C++ -*-
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// These tablegen backends emit Clang diagnostics tables.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANGDIAGS_EMITTER_H
+#define CLANGDIAGS_EMITTER_H
+
+#include "TableGenBackend.h"
+
+namespace llvm {
+
+/// ClangDiagsDefsEmitter - The top-level class emits .def files containing
+///  declarations of Clang diagnostics.
+///
+class ClangDiagsDefsEmitter : public TableGenBackend {
+  RecordKeeper &Records;
+public:
+  explicit ClangDiagsDefsEmitter(RecordKeeper &R) : Records(R) {}
+
+  // run - Output the .def file contents
+  void run(std::ostream &OS);
+};
+
+} // End llvm namespace
+
+#endif
diff --git a/utils/TableGen/TableGen.cpp b/utils/TableGen/TableGen.cpp
index 36ad999a1e..e6ed092b62 100644
--- a/utils/TableGen/TableGen.cpp
+++ b/utils/TableGen/TableGen.cpp
@@ -34,6 +34,7 @@
 #include "SubtargetEmitter.h"
 #include "IntrinsicEmitter.h"
 #include "LLVMCConfigurationEmitter.h"
+#include "ClangDiagnosticsEmitter.h"
 #include <algorithm>
 #include <cstdio>
 #include <fstream>
@@ -46,6 +47,7 @@ enum ActionType {
   GenRegisterEnums, GenRegister, GenRegisterHeader,
   GenInstrEnums, GenInstrs, GenAsmWriter,
   GenCallingConv,
+  GenClangDiagsDefs,
   GenDAGISel,
   GenFastISel,
   GenSubtarget,
@@ -86,6 +88,8 @@ namespace {
                                "Generate intrinsic information"),
                     clEnumValN(GenTgtIntrinsic, "gen-tgt-intrinsic",
                                "Generate target intrinsic information"),
+                    clEnumValN(GenClangDiagsDefs, "gen-clang-diags-defs",
+                               "Generate Clang diagnostics definitions"),
                     clEnumValN(GenLLVMCConf, "gen-llvmc",
                                "Generate LLVMC configuration library"),
                     clEnumValN(PrintEnums, "print-enums",
@@ -185,7 +189,6 @@ int main(int argc, char **argv) {
     case GenRegisterHeader:
       RegisterInfoEmitter(Records).runHeader(*Out);
       break;
-
     case GenInstrEnums:
       InstrEnumEmitter(Records).run(*Out);
       break;
@@ -198,7 +201,9 @@ int main(int argc, char **argv) {
     case GenAsmWriter:
       AsmWriterEmitter(Records).run(*Out);
       break;
-
+    case GenClangDiagsDefs:
+      ClangDiagsDefsEmitter(Records).run(*Out);
+      break;
     case GenDAGISel:
       DAGISelEmitter(Records).run(*Out);
       break;