[clang-tools-extra] [clang-tidy] Add readability-redundant-casting check (PR #70595)

[Congcong Cai via cfe-commits]

================
@@ -0,0 +1,242 @@
+//===--- RedundantCastingCheck.cpp - clang-tidy ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "RedundantCastingCheck.h"
+#include "../utils/FixItHintUtils.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::readability {
+
+static bool areTypesEquals(QualType S, QualType D) {
+  if (S == D)
+    return true;
+
+  const auto *TS = S->getAs<TypedefType>();
+  const auto *TD = D->getAs<TypedefType>();
+  if (TS != TD)
+    return false;
+
+  QualType PtrS = S->getPointeeType();
+  QualType PtrD = D->getPointeeType();
+
+  if (!PtrS.isNull() && !PtrD.isNull())
+    return areTypesEquals(PtrS, PtrD);
+
+  const DeducedType *DT = S->getContainedDeducedType();
+  if (DT && DT->isDeduced())
+    return D == DT->getDeducedType();
+
+  return false;
+}
+
+static bool areTypesEquals(QualType TypeS, QualType TypeD,
+                           bool IgnoreTypeAliases) {
+  const QualType CTypeS = TypeS.getCanonicalType();
+  const QualType CTypeD = TypeD.getCanonicalType();
+  if (CTypeS != CTypeD)
+    return false;
+
+  return IgnoreTypeAliases || areTypesEquals(TypeS.getLocalUnqualifiedType(),
+                                             TypeD.getLocalUnqualifiedType());
+}
+
+static bool areBinaryOperatorOperandsTypesEqual(const Expr *E,
+                                                bool IgnoreTypeAliases) {
+  if (!E)
+    return false;
+  const Expr *WithoutImplicitAndParen = E->IgnoreParenImpCasts();
+  if (!WithoutImplicitAndParen)
+    return false;
+  if (const auto *B = dyn_cast<BinaryOperator>(WithoutImplicitAndParen)) {
+    const QualType NonReferenceType =
+        WithoutImplicitAndParen->getType().getNonReferenceType();
+    if (!areTypesEquals(
+            B->getLHS()->IgnoreImplicit()->getType().getNonReferenceType(),
+            NonReferenceType, IgnoreTypeAliases))
+      return true;
+    if (!areTypesEquals(
+            B->getRHS()->IgnoreImplicit()->getType().getNonReferenceType(),
+            NonReferenceType, IgnoreTypeAliases))
+      return true;
+  }
+  return false;
+}
+
+static const Decl *getSourceExprDecl(const Expr *SourceExpr) {
+  const Expr *CleanSourceExpr = SourceExpr->IgnoreParenImpCasts();
+  if (const auto *E = dyn_cast<DeclRefExpr>(CleanSourceExpr)) {
+    return E->getDecl();
+  }
+
+  if (const auto *E = dyn_cast<CallExpr>(CleanSourceExpr)) {
+    return E->getCalleeDecl();
+  }
+
+  if (const auto *E = dyn_cast<MemberExpr>(CleanSourceExpr)) {
+    return E->getMemberDecl();
+  }
+  return nullptr;
+}
+
+RedundantCastingCheck::RedundantCastingCheck(StringRef Name,
+                                             ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context),
+      IgnoreMacros(Options.getLocalOrGlobal("IgnoreMacros", true)),
+      IgnoreTypeAliases(Options.getLocalOrGlobal("IgnoreTypeAliases", false)) {}
+
+void RedundantCastingCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+  Options.store(Opts, "IgnoreMacros", IgnoreMacros);
+  Options.store(Opts, "IgnoreTypeAliases", IgnoreTypeAliases);
+}
+
+void RedundantCastingCheck::registerMatchers(MatchFinder *Finder) {
+
+  auto SimpleType = qualType(hasCanonicalType(
+      qualType(anyOf(builtinType(), references(builtinType()),
+                     references(pointsTo(qualType())), pointsTo(qualType())))));
+
+  auto BitfieldMemberExpr = memberExpr(member(fieldDecl(isBitField())));
+
+  Finder->addMatcher(
+      explicitCastExpr(
+          unless(hasCastKind(CK_ConstructorConversion)),
+          unless(hasCastKind(CK_UserDefinedConversion)),
+          unless(cxxFunctionalCastExpr(hasDestinationType(unless(SimpleType)))),
+
+          hasDestinationType(qualType().bind("type2")),
+          hasSourceExpression(anyOf(
+              expr(unless(initListExpr()), unless(BitfieldMemberExpr),
+                   hasType(qualType().bind("type1")))
----------------
HerrCai0907 wrote:

`type1` and `type2` are not a good idea. Do you mean `dstType` and `srcType`

https://github.com/llvm/llvm-project/pull/70595