Replace some NULL usage with nullptr

Author: devajithvs

mlir/lib/Tools/mlir-query/Parser.cpp

@@ -355,7 +355,7 @@ bool Parser::parseMatcherExpressionImpl(VariantValue *Value) {
   DynMatcher *Result = S->actOnMatcherExpression(NameToken.Text, MatcherRange,
                                                  extractFunction, Args, Error);
 
-  if (Result == NULL) {
+  if (Result == nullptr) {
     // TODO: Add appropriate error.
     // Error->addError(NameToken.Range, Error->ET_ParserMatcherFailure)
     //    << NameToken.Text;
@@ -451,11 +451,11 @@ DynMatcher *Parser::parseMatcherExpression(StringRef Code, Parser::Sema *S,
   VariantValue Value;
   if (!parseExpression(Code, S, &Value, Error)) {
 
-    return NULL;
+    return nullptr;
   }
   if (!Value.isMatcher()) {
     Error->addError(SourceRange(), Error->ET_ParserNotAMatcher);
-    return NULL;
+    return nullptr;
   }
   // FIXME: remove clone
   return Value.getMatcher().clone();

mlir/lib/Tools/mlir-query/Parser.h

@@ -56,7 +56,7 @@ class Parser {
     // All the arguments passed here have already been processed.
     // MatcherName is the matcher name found by the parser.
     // Args is the argument list for the matcher.
-    // Returns the matcher object constructed by the processor, or NULL
+    // Returns the matcher object constructed by the processor, or nullptr
     // if an error occurred. In that case, Error will contain a
     // description of the error.
     // The caller takes ownership of the Matcher object returned.
@@ -74,7 +74,7 @@ class Parser {
   // use the overload below that takes a Sema.
 
   // MatcherCode is the matcher expression to parse.
-  // Returns the matcher object constructed, or NULL if an error occurred.
+  // Returns the matcher object constructed, or nullptr if an error occurred.
   // In that case, Error will contain a description of the error.
   // The caller takes ownership of the DynMatcher object returned.
   static DynMatcher *parseMatcherExpression(StringRef MatcherCode,
@@ -86,7 +86,7 @@ class Parser {
 
   // S is the Sema instance that will help the parser
   // construct the matchers.
-  // Returns the matcher object constructed by the processor, or NULL
+  // Returns the matcher object constructed by the processor, or nullptr
   // if an error occurred. In that case, Error will contain a
   // description of the error.
   // The caller takes ownership of the DynMatcher object returned.

mlir/lib/Tools/mlir-query/Registry.cpp

@@ -112,7 +112,7 @@ DynMatcher *Registry::constructMatcher(StringRef MatcherName,
   if (it == RegistryData->constructors().end()) {
     Error->addError(NameRange, Error->ET_RegistryMatcherNotFound)
         << MatcherName;
-    return NULL;
+    return nullptr;
   }
 
   return it->second->run(NameRange, Args, Error);

mlir/lib/Tools/mlir-query/Registry.h

@@ -36,7 +36,7 @@ class Registry {
   // values must be valid for the matcher requested. Otherwise, the function
   // will return an error.
 
-  // Returns the matcher if no error was found. NULL if the matcher is not
+  // Returns the matcher if no error was found. nullptr if the matcher is not
   // found, or if the number of arguments or argument types do not
   // match the signature. In that case Error will contain the description
   // of the error.