Kazantsev Evgeny. Lab 1, var 3.

clang/labs/lab1/kazantsev_evgeny/CMakeLists.txt

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+add_llvm_library(DeprecatedPlug MODULE DeprecatedPlug.cpp PLUGIN_TOOL clang)
+
+if(WIN32 OR CYGWIN)
+	set(LLVM_LINK_COMPONENTS SUpport)
+	clang_target_link_libraries(DeprecatedPlug PRIVATE
+		clangAST
+		clangBasic
+		clangFrontend)
+endif()
+
+set(CLANG_TEST_DEPS "DeprecatedPlug" ${CLANG_TEST_DEPS} PARENT_SCOPE)

clang/labs/lab1/kazantsev_evgeny/DeprecatedPlug.cpp

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+#include "clang/AST/AST.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+
+class DeprecatedFuncName : public RecursiveASTVisitor<DeprecatedFuncName> {
+public:
+  explicit DeprecatedFuncName(
+      ASTContext
+          *Context) // get the AST tree context and initialize to "deprecated"
+      : Context(Context), DeprecatedIdentifier("deprecated") {}
+
+  bool VisitFunctionDecl(FunctionDecl *FD) {
+    // Check if the function name contains the word "deprecated"
+    std::string FuncName = FD->getNameAsString();
+    std::transform(FuncName.begin(), FuncName.end(), FuncName.begin(),
+                   ::tolower);
+    if (FuncName.find(DeprecatedIdentifier) != std::string::npos) {
+      // Emit a warning
+      SourceLocation Loc = FD->getLocation();
+      unsigned DiagID = Context->getDiagnostics().getCustomDiagID(
+          DiagnosticsEngine::Warning, "Deprecated function name");
+      Context->getDiagnostics().Report(Loc, DiagID);
+    }
+    return true;
+  }
+
+private:
+  ASTContext *Context;
+  std::string DeprecatedIdentifier;
+};
+
+class DeprecatedConsumer : public ASTConsumer {
+public:
+  explicit DeprecatedConsumer(ASTContext *Context) : Visitor(Context) {}
+
+  // traversal from the root node
+  void HandleTranslationUnit(ASTContext &Context) override {
+    Visitor.TraverseDecl(Context.getTranslationUnitDecl());
+  }
+
+private:
+  DeprecatedFuncName Visitor;
+};
+
+class DeprecatedFuncAction : public PluginASTAction {
+protected:
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 llvm::StringRef) override {
+    return std::make_unique<DeprecatedConsumer>(&CI.getASTContext());
+  }
+  bool ParseArgs(const CompilerInstance &Compiler,
+                 const std::vector<std::string> &args) override {
+    if (!args.empty() && args[0] == "help")
+      PrintHelp(llvm::errs());
+
+    return true;
+  }
+
+  void PrintHelp(llvm::raw_ostream &ros) {
+    ros << "Deprecated Plugin version 1.0\n";
+  }
+};
+
+// Register the plugin
+static FrontendPluginRegistry::Add<DeprecatedFuncAction>
+    X("deprecated-function", "check for deprecated function names");

clang/test/lab1/kazantsev_evgeny/testDep.cpp

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+// RUN: %clang_cc1 -load %llvmshlibdir/DeprecatedPlug%pluginext -plugin deprecated-function %s 2>&1 | FileCheck %s --check-prefix=DEPRECATED
+// REQUIRES: plugins
+
+// DEPRECATED: warning: Deprecated function name
+void Deprecated(int a, int b);
+
+// DEPRECATED: warning: Deprecated function name
+void dEpReCaTeD(int c);
+
+// DEPRECATED-NOT: warning: Deprecated function name
+void sqrt();
+
+// RUN: %clang_cc1 -load %llvmshlibdir/DeprecatedPlug%pluginext -plugin deprecated-function %s -plugin-arg-deprecated-function help 2>&1 | FileCheck %s --check-prefix=HELP
+// REQUIRES: plugins
+
+// HELP: Deprecated Plugin version 1.0