Fix MLIR-TblGen to fix KW issues (#1)

* - fixed uninitialized array declaration in `mlir-tblgen/OpFormatGen.cpp`
   - fixed creating `void` methods returning value in `mlir-tblgen/OpInterfacesGen.cpp`

* Apply comment on OpInterfacesGen.cpp by nikita-kud

Author: OrestChura

mlir/tools/mlir-tblgen/OpFormatGen.cpp

@@ -751,7 +751,7 @@ static void genElementParserStorage(FormatElement *element, const Operator &op,
       }
     } else {
       body << "  ::mlir::OpAsmParser::OperandType " << name
-           << "RawOperands[1];\n"
+           << "RawOperands[1] = { };\n"
            << "  ::llvm::ArrayRef<::mlir::OpAsmParser::OperandType> " << name
            << "Operands(" << name << "RawOperands);";
     }
@@ -788,7 +788,7 @@ static void genElementParserStorage(FormatElement *element, const Operator &op,
     if (lengthKind != ArgumentLengthKind::Single)
       body << "  ::mlir::SmallVector<::mlir::Type, 1> " << name << "Types;\n";
     else
-      body << llvm::formatv("  ::mlir::Type {0}RawTypes[1];\n", name)
+      body << llvm::formatv("  ::mlir::Type {0}RawTypes[1] = {{ };\n", name)
            << llvm::formatv(
                   "  ::llvm::ArrayRef<::mlir::Type> {0}Types({0}RawTypes);\n",
                   name);

mlir/tools/mlir-tblgen/OpInterfacesGen.cpp

@@ -167,15 +167,20 @@ static void emitInterfaceDef(const Interface &interface, StringRef valueType,
   // Insert the method definitions.
   bool isOpInterface = isa<OpInterface>(interface);
   for (auto &method : interface.getMethods()) {
-    emitCPPType(method.getReturnType(), os);
+    auto returnType = method.getReturnType();
+    emitCPPType(returnType, os);
     if (!cppNamespace.empty())
       os << cppNamespace << "::";
     os << interfaceName << "::";
     emitMethodNameAndArgs(method, os, valueType, /*addThisArg=*/false,
                           /*addConst=*/!isOpInterface);
 
     // Forward to the method on the concrete operation type.
-    os << " {\n      return getImpl()->" << method.getName() << '(';
+    os << " {\n      ";
+    if (returnType != "void") {
+      os << "return ";
+    }
+    os << "getImpl()->" << method.getName() << '(';
     if (!method.isStatic()) {
       os << "getImpl(), ";
       os << (isOpInterface ? "getOperation()" : "*this");
@@ -283,7 +288,8 @@ void InterfaceGenerator::emitModelDecl(const Interface &interface) {
 void InterfaceGenerator::emitModelMethodsDef(const Interface &interface) {
   for (auto &method : interface.getMethods()) {
     os << "template<typename " << valueTemplate << ">\n";
-    emitCPPType(method.getReturnType(), os);
+    auto returnType = method.getReturnType();
+    emitCPPType(returnType, os);
     os << "detail::" << interface.getName() << "InterfaceTraits::Model<"
        << valueTemplate << ">::";
     emitMethodNameAndArgs(method, os, valueType,
@@ -302,10 +308,15 @@ void InterfaceGenerator::emitModelMethodsDef(const Interface &interface) {
     }
 
     // Forward to the method on the concrete operation type.
-    if (method.isStatic())
-      os << "return " << valueTemplate << "::";
-    else
-      os << tblgen::tgfmt("return $_self.", &nonStaticMethodFmt);
+    if (returnType != "void") {
+      os << "return ";
+    }
+
+    if (method.isStatic()) {
+      os << valueTemplate << "::";
+    } else {
+      os << tblgen::tgfmt("$_self.", &nonStaticMethodFmt);
+    }
 
     // Add the arguments to the call.
     os << method.getName() << '(';
@@ -317,7 +328,8 @@ void InterfaceGenerator::emitModelMethodsDef(const Interface &interface) {
 
   for (auto &method : interface.getMethods()) {
     os << "template<typename " << valueTemplate << ">\n";
-    emitCPPType(method.getReturnType(), os);
+    auto returnType = method.getReturnType();
+    emitCPPType(returnType, os);
     os << "detail::" << interface.getName() << "InterfaceTraits::FallbackModel<"
        << valueTemplate << ">::";
     emitMethodNameAndArgs(method, os, valueType,
@@ -326,11 +338,15 @@ void InterfaceGenerator::emitModelMethodsDef(const Interface &interface) {
     os << " {\n  ";
 
     // Forward to the method on the concrete Model implementation.
-    if (method.isStatic())
-      os << "return " << valueTemplate << "::";
-    else
-      os << "return static_cast<const " << valueTemplate << " *>(impl)->";
-
+    if (returnType != "void") {
+      os << "return ";
+    }
+    
+    if (method.isStatic()) {
+      os << valueTemplate << "::";
+    } else {
+      os << "static_cast<const " << valueTemplate << " *>(impl)->";
+    }
     // Add the arguments to the call.
     os << method.getName() << '(';
     if (!method.isStatic())
@@ -368,7 +384,7 @@ void InterfaceGenerator::emitModelMethodsDef(const Interface &interface) {
     if (!method.isStatic())
       os << " const";
 
-    os << " {\n";
+    os << " {\n  ";
 
     // Use the empty context for static methods.
     tblgen::FmtContext ctx;
@@ -443,7 +459,7 @@ void InterfaceGenerator::emitInterfaceDecl(const Interface &interface) {
      << "struct " << interfaceTraitsName << " {\n";
   emitConceptDecl(interface);
   emitModelDecl(interface);
-  os << "};";
+  os << "};\n";
 
   // Emit the derived trait for the interface.
   os << "template <typename " << valueTemplate << ">\n";