[libcxx] [llvm] [clang-tools-extra] [mlir] [clang] [openmp] [flang] [clang-tidy] Replace memcpy with std::copy (PR #74663)

[Piotr Zegar via cfe-commits]

================
@@ -0,0 +1,119 @@
+//===--- ReplaceMemcpyWithStdCopy.cpp - clang-tidy----------------*- C++-*-===//
+//
+// 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 "ReplaceMemcpyWithStdCopy.h"
+#include "../utils/OptionsUtils.h"
+#include <array>
+
+using namespace clang;
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+ReplaceMemcpyWithStdCopy::ReplaceMemcpyWithStdCopy(StringRef Name,
+                                                   ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context),
+      IncludeInserter(Options.getLocalOrGlobal("IncludeStyle",
+                                               utils::IncludeSorter::IS_LLVM)) {
+}
+
+void ReplaceMemcpyWithStdCopy::registerMatchers(MatchFinder *Finder) {
+  assert(Finder != nullptr);
+
+  if (!getLangOpts().CPlusPlus)
+    return;
+
+  auto MemcpyMatcher =
+      callExpr(hasDeclaration(functionDecl(hasName("memcpy"),
+                                           isExpansionInSystemHeader())),
+               isExpansionInMainFile())
+          .bind("memcpy_function");
+
+  Finder->addMatcher(MemcpyMatcher, this);
+}
+
+void ReplaceMemcpyWithStdCopy::registerPPCallbacks(
+    const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
+  if (!getLangOpts().CPlusPlus)
+    return;
+
+  Inserter =
+      std::make_unique<utils::IncludeInserter>(SM, getLangOpts(),
+                                                       IncludeStyle);
+  PP->addPPCallbacks(Inserter->CreatePPCallbacks());
+}
+
+void ReplaceMemcpyWithStdCopy::check(const MatchFinder::MatchResult &Result) {
+  const auto *MemcpyNode = Result.Nodes.getNodeAs<CallExpr>("memcpy_function");
+  assert(MemcpyNode != nullptr);
+
+  DiagnosticBuilder Diag =
+      diag(MemcpyNode->getExprLoc(), "use std::copy instead of memcpy");
+
+  renameFunction(Diag, MemcpyNode);
+  reorderArgs(Diag, MemcpyNode);
+  insertHeader(Diag, MemcpyNode, Result.SourceManager);
+}
+
+void ReplaceMemcpyWithStdCopy::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+  Options.store(Opts, "IncludeStyle",
+                utils::IncludeSorter::toString(IncludeStyle));
+}
+
+void ReplaceMemcpyWithStdCopy::renameFunction(DiagnosticBuilder &Diag,
+                                              const CallExpr *MemcpyNode) {
+  const CharSourceRange FunctionNameSourceRange = CharSourceRange::getCharRange(
+      MemcpyNode->getBeginLoc(), MemcpyNode->getArg(0)->getBeginLoc());
+
+  Diag << FixItHint::CreateReplacement(FunctionNameSourceRange, "std::copy(");
+}
+
+void ReplaceMemcpyWithStdCopy::reorderArgs(DiagnosticBuilder &Diag,
+                                           const CallExpr *MemcpyNode) {
+  std::array<std::string, 3> arg;
+
+  LangOptions LangOpts;
+  LangOpts.CPlusPlus = true;
+  PrintingPolicy Policy(LangOpts);
+
+  // Retrieve all the arguments
+  for (uint8_t i = 0; i < arg.size(); i++) {
----------------
PiotrZSL wrote:

just read from a source by using tooling::fixit::getText, or way around with:
CreateInsertionFromRange and CreateRemoval


https://github.com/llvm/llvm-project/pull/74663