[mlir][NFC] Use explicit `mlir` namespace in generated code

This makes the generated code independent from actual namespace of its users.

Reviewed By: rriddle

Differential Revision: https://reviews.llvm.org/D95520

mlir/include/mlir/IR/OpAsmInterface.td

@@ -47,7 +47,7 @@ def OpAsmOpInterface : OpInterface<"OpAsmOpInterface"> {
           %first_result, %middle_results:2, %0 = "my.op" ...
         ```
       }],
-      "void", "getAsmResultNames", (ins "OpAsmSetValueNameFn":$setNameFn)
+      "void", "getAsmResultNames", (ins "::mlir::OpAsmSetValueNameFn":$setNameFn)
     >,
   ];
 }

mlir/include/mlir/IR/SymbolInterfaces.td

@@ -206,7 +206,7 @@ def SymbolUserOpInterface : OpInterface<"SymbolUserOpInterface"> {
 
   let methods = [
     InterfaceMethod<"Verify the symbol uses held by this operation.",
-      "LogicalResult", "verifySymbolUses",
+      "::mlir::LogicalResult", "verifySymbolUses",
       (ins "::mlir::SymbolTableCollection &":$symbolTable)
     >,
   ];

mlir/include/mlir/Interfaces/CopyOpInterface.td

@@ -24,12 +24,12 @@ def CopyOpInterface : OpInterface<"CopyOpInterface"> {
   let methods = [
     InterfaceMethod<
       /*desc=*/"Returns the source value for this copy operation",
-      /*retTy=*/"Value",
+      /*retTy=*/"::mlir::Value",
       /*methodName=*/"getSource"
     >,
     InterfaceMethod<
       /*desc=*/"Returns the target value for this copy operation",
-      /*retTy=*/"Value",
+      /*retTy=*/"::mlir::Value",
       /*methodName=*/"getTarget"
     >
   ];

mlir/include/mlir/Interfaces/InferTypeOpInterface.td

@@ -90,14 +90,14 @@ def InferShapedTypeOpInterface : OpInterface<"InferShapedTypeOpInterface"> {
       may be returned by this function while returning success. E.g., partial
       population of components is not error condition.
       }],
-      /*retTy=*/"LogicalResult",
+      /*retTy=*/"::mlir::LogicalResult",
       /*methodName=*/"inferReturnTypeComponents",
-      /*args=*/(ins "MLIRContext*":$context,
-                    "Optional<Location>":$location,
-                    "ValueRange":$operands,
-                    "DictionaryAttr":$attributes,
-                    "RegionRange":$regions,
-                    "SmallVectorImpl<ShapedTypeComponents>&":
+      /*args=*/(ins "::mlir::MLIRContext*":$context,
+                    "::mlir::Optional<::mlir::Location>":$location,
+                    "::mlir::ValueRange":$operands,
+                    "::mlir::DictionaryAttr":$attributes,
+                    "::mlir::RegionRange":$regions,
+                    "::mlir::SmallVectorImpl<::mlir::ShapedTypeComponents>&":
                       $inferredReturnShapes)
     >,
     InterfaceMethod<
@@ -106,12 +106,12 @@ def InferShapedTypeOpInterface : OpInterface<"InferShapedTypeOpInterface"> {
       Insert operations using the given OpBuilder that computes the result
       shape.
       }],
-      /*retTy=*/"LogicalResult",
+      /*retTy=*/"::mlir::LogicalResult",
       /*methodName=*/"reifyReturnTypeShapes",
-      /*args=*/(ins "OpBuilder&":$builder,
-                    "SmallVectorImpl<Value>&":$reifiedReturnShapes),
+      /*args=*/(ins "::mlir::OpBuilder&":$builder,
+                    "::mlir::SmallVectorImpl<::mlir::Value>&":$reifiedReturnShapes),
       /*methodBody=*/[{}],
-      /*defaultImplementation=*/[{ return failure(); }]
+      /*defaultImplementation=*/[{ return ::mlir::failure(); }]
     >,
   ];
 }

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

@@ -898,8 +898,9 @@ static void generateNamedOperandGetters(const Operator &op, Class &opClass,
 
     if (operand.isOptional()) {
       m = opClass.addMethodAndPrune("::mlir::Value", operand.name);
-      m->body() << "  auto operands = getODSOperands(" << i << ");\n"
-                << "  return operands.empty() ? Value() : *operands.begin();";
+      m->body()
+          << "  auto operands = getODSOperands(" << i << ");\n"
+          << "  return operands.empty() ? ::mlir::Value() : *operands.begin();";
     } else if (operand.isVariadic()) {
       m = opClass.addMethodAndPrune(rangeType, operand.name);
       m->body() << "  return getODSOperands(" << i << ");";

mlir/tools/mlir-tblgen/RewriterGen.cpp

@@ -260,7 +260,7 @@ void PatternEmitter::emitNativeCodeMatch(DagNode tree, StringRef opName,
 
   raw_indented_ostream::DelimitedScope scope(os);
 
-  os << "if(!" << opName << ") return failure();\n";
+  os << "if(!" << opName << ") return ::mlir::failure();\n";
   for (int i = 0, e = tree.getNumArgs(); i != e; ++i) {
     std::string argName = formatv("arg{0}_{1}", depth, i);
     if (DagNode argTree = tree.getArgAsNestedDag(i)) {
@@ -286,7 +286,7 @@ void PatternEmitter::emitNativeCodeMatch(DagNode tree, StringRef opName,
       fmt, &fmtCtx.addSubst("_loc", locToUse), opName, capture[0], capture[1],
       capture[2], capture[3], capture[4], capture[5], capture[6], capture[7]));
 
-  os << "if (failed(" << nativeCodeCall << ")) return failure();\n";
+  os << "if (failed(" << nativeCodeCall << ")) return ::mlir::failure();\n";
 
   for (int i = 0, e = tree.getNumArgs(); i != e; ++i) {
     auto name = tree.getArgName(i);
@@ -336,7 +336,7 @@ void PatternEmitter::emitOpMatch(DagNode tree, StringRef opName, int depth) {
   // Skip the operand matching at depth 0 as the pattern rewriter already does.
   if (depth != 0) {
     // Skip if there is no defining operation (e.g., arguments to function).
-    os << formatv("if (!{0}) return failure();\n", castedName);
+    os << formatv("if (!{0}) return ::mlir::failure();\n", castedName);
   }
   if (tree.getNumArgs() != op.getNumArgs()) {
     PrintFatalError(loc, formatv("op '{0}' argument number mismatch: {1} in "