Index: cfe/trunk/include/clang/Analysis/AnyCall.h
===================================================================
--- cfe/trunk/include/clang/Analysis/AnyCall.h
+++ cfe/trunk/include/clang/Analysis/AnyCall.h
@@ -0,0 +1,174 @@
+//=== AnyCall.h - Abstraction over different callables --------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// A utility class for performing generic operations over different callables.
+//
+//===----------------------------------------------------------------------===//
+//
+#ifndef LLVM_CLANG_ANALYSIS_ANY_CALL_H
+#define LLVM_CLANG_ANALYSIS_ANY_CALL_H
+
+#include "clang/AST/Decl.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/AST/ExprObjC.h"
+
+namespace clang {
+
+/// An instance of this class corresponds to a 'callable' call.
+class AnyCall {
+public:
+  enum Kind {
+    /// A function, function pointer, or a C++ method call
+    Function,
+
+    /// A call to an Objective-C method
+    ObjCMethod,
+
+    /// A call to an Objective-C block
+    Block,
+
+    /// An implicit C++ destructor call (called implicitly
+    /// or by operator 'delete')
+    Destructor,
+
+    /// An implicit or explicit C++ constructor call
+    Constructor,
+
+    /// A C++ allocation function call (operator `new`), via C++ new-expression
+    Allocator,
+
+    /// A C++ deallocation function call (operator `delete`), via C++
+    /// delete-expression
+    Deallocator
+  };
+
+private:
+  /// Call expression, remains null iff the call is an implicit destructor call.
+  const Expr *E = nullptr;
+
+  /// Corresponds to a statically known declaration of the called function,
+  /// or null if it is not known (e.g. for a function pointer).
+  const Decl *D = nullptr;
+  Kind K;
+
+  AnyCall(const Expr *E, const Decl *D, Kind K) : E(E), D(D), K(K) {}
+
+public:
+  AnyCall(const CallExpr *CE) : E(CE) {
+    D = CE->getCalleeDecl();
+    K = (CE->getCallee()->getType()->getAs<BlockPointerType>()) ? Block
+                                                                : Function;
+    if (D && ((K == Function && !isa<FunctionDecl>(D)) ||
+              (K == Block && !isa<BlockDecl>(D))))
+      D = nullptr;
+  }
+
+  AnyCall(const ObjCMessageExpr *ME)
+      : E(ME), D(ME->getMethodDecl()), K(ObjCMethod) {}
+
+  AnyCall(const CXXNewExpr *NE)
+      : E(NE), D(NE->getOperatorNew()), K(Allocator) {}
+
+  AnyCall(const CXXDeleteExpr *NE)
+      : E(NE), D(NE->getOperatorDelete()), K(Deallocator) {}
+
+  AnyCall(const CXXConstructExpr *NE)
+      : E(NE), D(NE->getConstructor()), K(Constructor) {}
+
+  /// If {@code E} is a generic call (to ObjC method /function/block/etc),
+  /// return a constructed {@code AnyCall} object. Return None otherwise.
+  static Optional<AnyCall> forExpr(const Expr *E) {
+    if (const auto *ME = dyn_cast<ObjCMessageExpr>(E)) {
+      return AnyCall(ME);
+    } else if (const auto *CE = dyn_cast<CallExpr>(E)) {
+      return AnyCall(CE);
+    } else if (const auto *CXNE = dyn_cast<CXXNewExpr>(E)) {
+      return AnyCall(CXNE);
+    } else if (const auto *CXDE = dyn_cast<CXXDeleteExpr>(E)) {
+      return AnyCall(CXDE);
+    } else if (const auto *CXCE = dyn_cast<CXXConstructExpr>(E)) {
+      return AnyCall(CXCE);
+    } else {
+      return None;
+    }
+  }
+
+  static AnyCall forDestructorCall(const CXXDestructorDecl *D) {
+    return AnyCall(/*E=*/nullptr, D, Destructor);
+  }
+
+  /// \returns formal parameters for direct calls (including virtual calls)
+  ArrayRef<ParmVarDecl *> parameters() const {
+    if (!D)
+      return None;
+
+    if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
+      return FD->parameters();
+    } else if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
+      return MD->parameters();
+    } else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D)) {
+      return CD->parameters();
+    } else if (const auto *BD = dyn_cast<BlockDecl>(D)) {
+      return BD->parameters();
+    } else {
+      return None;
+    }
+  }
+
+  using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator;
+  param_const_iterator param_begin() const { return parameters().begin(); }
+  param_const_iterator param_end() const { return parameters().end(); }
+  size_t param_size() const { return parameters().size(); }
+  bool param_empty() const { return parameters().empty(); }
+
+  QualType getReturnType(ASTContext &Ctx) const {
+    switch (K) {
+    case Function:
+    case Block:
+      return cast<CallExpr>(E)->getCallReturnType(Ctx);
+    case ObjCMethod:
+      return cast<ObjCMessageExpr>(E)->getCallReturnType(Ctx);
+    case Destructor:
+    case Constructor:
+    case Allocator:
+    case Deallocator:
+      return cast<FunctionDecl>(D)->getReturnType();
+    }
+  }
+
+  /// \returns Function identifier if it is a named declaration,
+  /// {@code nullptr} otherwise.
+  const IdentifierInfo *getIdentifier() const {
+    if (const auto *ND = dyn_cast_or_null<NamedDecl>(D))
+      return ND->getIdentifier();
+    return nullptr;
+  }
+
+  const Decl *getDecl() const {
+    return D;
+  }
+
+  const Expr *getExpr() const {
+    return E;
+  }
+
+  Kind getKind() const {
+    return K;
+  }
+
+  void dump() const {
+    if (E)
+      E->dump();
+    if (D)
+      D->dump();
+  }
+};
+
+}
+
+#endif // LLVM_CLANG_ANALYSIS_ANY_CALL_H