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//===- Marshallers.h - Generic matcher function marshallers -----*- 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Functions templates and classes to wrap matcher construct functions.
///
/// A collection of template function and classes that provide a generic
/// marshalling layer on top of matcher construct functions.
/// These are used by the registry to export all marshaller constructors with
/// the same generic interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_LIB_ASTMATCHERS_DYNAMIC_MARSHALLERS_H
#define LLVM_CLANG_LIB_ASTMATCHERS_DYNAMIC_MARSHALLERS_H

#include "clang/AST/ASTTypeTraits.h"
#include "clang/AST/OperationKinds.h"
#include "clang/ASTMatchers/ASTMatchersInternal.h"
#include "clang/ASTMatchers/Dynamic/Diagnostics.h"
#include "clang/ASTMatchers/Dynamic/VariantValue.h"
#include "clang/Basic/AttrKinds.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/OpenMPKinds.h"
#include "clang/Basic/TypeTraits.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Regex.h"
#include <cassert>
#include <cstddef>
#include <iterator>
#include <limits>
#include <memory>
#include <string>
#include <utility>
#include <vector>

namespace clang {
namespace ast_matchers {
namespace dynamic {
namespace internal {

/// Helper template class to just from argument type to the right is/get
///   functions in VariantValue.
/// Used to verify and extract the matcher arguments below.
template <class T> struct ArgTypeTraits;
template <class T> struct ArgTypeTraits<const T &> : public ArgTypeTraits<T> {
};

template <> struct ArgTypeTraits<std::string> {
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isString();
  }
  static bool hasCorrectValue(const VariantValue &Value) { return true; }

  static const std::string &get(const VariantValue &Value) {
    return Value.getString();
  }

  static ArgKind getKind() {
    return ArgKind(ArgKind::AK_String);
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &) {
    return llvm::None;
  }
};

template <>
struct ArgTypeTraits<StringRef> : public ArgTypeTraits<std::string> {
};

template <class T> struct ArgTypeTraits<ast_matchers::internal::Matcher<T>> {
  static bool hasCorrectType(const VariantValue& Value) {
    return Value.isMatcher();
  }
  static bool hasCorrectValue(const VariantValue &Value) {
    return Value.getMatcher().hasTypedMatcher<T>();
  }

  static ast_matchers::internal::Matcher<T> get(const VariantValue &Value) {
    return Value.getMatcher().getTypedMatcher<T>();
  }

  static ArgKind getKind() {
    return ArgKind(ASTNodeKind::getFromNodeKind<T>());
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &) {
    return llvm::None;
  }
};

template <> struct ArgTypeTraits<bool> {
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isBoolean();
  }
  static bool hasCorrectValue(const VariantValue &Value) { return true; }

  static bool get(const VariantValue &Value) {
    return Value.getBoolean();
  }

  static ArgKind getKind() {
    return ArgKind(ArgKind::AK_Boolean);
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &) {
    return llvm::None;
  }
};

template <> struct ArgTypeTraits<double> {
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isDouble();
  }
  static bool hasCorrectValue(const VariantValue &Value) { return true; }

  static double get(const VariantValue &Value) {
    return Value.getDouble();
  }

  static ArgKind getKind() {
    return ArgKind(ArgKind::AK_Double);
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &) {
    return llvm::None;
  }
};

template <> struct ArgTypeTraits<unsigned> {
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isUnsigned();
  }
  static bool hasCorrectValue(const VariantValue &Value) { return true; }

  static unsigned get(const VariantValue &Value) {
    return Value.getUnsigned();
  }

  static ArgKind getKind() {
    return ArgKind(ArgKind::AK_Unsigned);
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &) {
    return llvm::None;
  }
};

template <> struct ArgTypeTraits<attr::Kind> {
private:
  static Optional<attr::Kind> getAttrKind(llvm::StringRef AttrKind) {
    if (!AttrKind.consume_front("attr::"))
      return llvm::None;
    return llvm::StringSwitch<Optional<attr::Kind>>(AttrKind)
#define ATTR(X) .Case(#X, attr::X)
#include "clang/Basic/AttrList.inc"
        .Default(llvm::None);
  }

public:
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isString();
  }
  static bool hasCorrectValue(const VariantValue& Value) {
    return getAttrKind(Value.getString()).hasValue();
  }

  static attr::Kind get(const VariantValue &Value) {
    return *getAttrKind(Value.getString());
  }

  static ArgKind getKind() {
    return ArgKind(ArgKind::AK_String);
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &Value);
};

template <> struct ArgTypeTraits<CastKind> {
private:
  static Optional<CastKind> getCastKind(llvm::StringRef AttrKind) {
    if (!AttrKind.consume_front("CK_"))
      return llvm::None;
    return llvm::StringSwitch<Optional<CastKind>>(AttrKind)
#define CAST_OPERATION(Name) .Case(#Name, CK_##Name)
#include "clang/AST/OperationKinds.def"
        .Default(llvm::None);
  }

public:
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isString();
  }
  static bool hasCorrectValue(const VariantValue& Value) {
    return getCastKind(Value.getString()).hasValue();
  }

  static CastKind get(const VariantValue &Value) {
    return *getCastKind(Value.getString());
  }

  static ArgKind getKind() {
    return ArgKind(ArgKind::AK_String);
  }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &Value);
};

template <> struct ArgTypeTraits<llvm::Regex::RegexFlags> {
private:
  static Optional<llvm::Regex::RegexFlags> getFlags(llvm::StringRef Flags);

public:
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isString();
  }
  static bool hasCorrectValue(const VariantValue& Value) {
    return getFlags(Value.getString()).hasValue();
  }

  static llvm::Regex::RegexFlags get(const VariantValue &Value) {
    return *getFlags(Value.getString());
  }

  static ArgKind getKind() { return ArgKind(ArgKind::AK_String); }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &Value);
};

template <> struct ArgTypeTraits<OpenMPClauseKind> {
private:
  static Optional<OpenMPClauseKind> getClauseKind(llvm::StringRef ClauseKind) {
    return llvm::StringSwitch<Optional<OpenMPClauseKind>>(ClauseKind)
#define GEN_CLANG_CLAUSE_CLASS
#define CLAUSE_CLASS(Enum, Str, Class) .Case(#Enum, llvm::omp::Clause::Enum)
#include "llvm/Frontend/OpenMP/OMP.inc"
        .Default(llvm::None);
  }

public:
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isString();
  }
  static bool hasCorrectValue(const VariantValue& Value) {
    return getClauseKind(Value.getString()).hasValue();
  }

  static OpenMPClauseKind get(const VariantValue &Value) {
    return *getClauseKind(Value.getString());
  }

  static ArgKind getKind() { return ArgKind(ArgKind::AK_String); }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &Value);
};

template <> struct ArgTypeTraits<UnaryExprOrTypeTrait> {
private:
  static Optional<UnaryExprOrTypeTrait>
  getUnaryOrTypeTraitKind(llvm::StringRef ClauseKind) {
    if (!ClauseKind.consume_front("UETT_"))
      return llvm::None;
    return llvm::StringSwitch<Optional<UnaryExprOrTypeTrait>>(ClauseKind)
#define UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) .Case(#Name, UETT_##Name)
#define CXX11_UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key)                    \
  .Case(#Name, UETT_##Name)
#include "clang/Basic/TokenKinds.def"
        .Default(llvm::None);
  }

public:
  static bool hasCorrectType(const VariantValue &Value) {
    return Value.isString();
  }
  static bool hasCorrectValue(const VariantValue& Value) {
    return getUnaryOrTypeTraitKind(Value.getString()).hasValue();
  }

  static UnaryExprOrTypeTrait get(const VariantValue &Value) {
    return *getUnaryOrTypeTraitKind(Value.getString());
  }

  static ArgKind getKind() { return ArgKind(ArgKind::AK_String); }

  static llvm::Optional<std::string> getBestGuess(const VariantValue &Value);
};

/// Matcher descriptor interface.
///
/// Provides a \c create() method that constructs the matcher from the provided
/// arguments, and various other methods for type introspection.
class MatcherDescriptor {
public:
  virtual ~MatcherDescriptor() = default;

  virtual VariantMatcher create(SourceRange NameRange,
                                ArrayRef<ParserValue> Args,
                                Diagnostics *Error) const = 0;

  /// Returns whether the matcher is variadic. Variadic matchers can take any
  /// number of arguments, but they must be of the same type.
  virtual bool isVariadic() const = 0;

  /// Returns the number of arguments accepted by the matcher if not variadic.
  virtual unsigned getNumArgs() const = 0;

  /// Given that the matcher is being converted to type \p ThisKind, append the
  /// set of argument types accepted for argument \p ArgNo to \p ArgKinds.
  // FIXME: We should provide the ability to constrain the output of this
  // function based on the types of other matcher arguments.
  virtual void getArgKinds(ASTNodeKind ThisKind, unsigned ArgNo,
                           std::vector<ArgKind> &ArgKinds) const = 0;

  /// Returns whether this matcher is convertible to the given type.  If it is
  /// so convertible, store in *Specificity a value corresponding to the
  /// "specificity" of the converted matcher to the given context, and in
  /// *LeastDerivedKind the least derived matcher kind which would result in the
  /// same matcher overload.  Zero specificity indicates that this conversion
  /// would produce a trivial matcher that will either always or never match.
  /// Such matchers are excluded from code completion results.
  virtual bool
  isConvertibleTo(ASTNodeKind Kind, unsigned *Specificity = nullptr,
                  ASTNodeKind *LeastDerivedKind = nullptr) const = 0;

  /// Returns whether the matcher will, given a matcher of any type T, yield a
  /// matcher of type T.
  virtual bool isPolymorphic() const { return false; }
};

inline bool isRetKindConvertibleTo(ArrayRef<ASTNodeKind> RetKinds,
                                   ASTNodeKind Kind, unsigned *Specificity,
                                   ASTNodeKind *LeastDerivedKind) {
  for (const ASTNodeKind &NodeKind : RetKinds) {
    if (ArgKind(NodeKind).isConvertibleTo(Kind, Specificity)) {
      if (LeastDerivedKind)
        *LeastDerivedKind = NodeKind;
      return true;
    }
  }
  return false;
}

/// Simple callback implementation. Marshaller and function are provided.
///
/// This class wraps a function of arbitrary signature and a marshaller
/// function into a MatcherDescriptor.
/// The marshaller is in charge of taking the VariantValue arguments, checking
/// their types, unpacking them and calling the underlying function.
class FixedArgCountMatcherDescriptor : public MatcherDescriptor {
public:
  using MarshallerType = VariantMatcher (*)(void (*Func)(),
                                            StringRef MatcherName,
                                            SourceRange NameRange,
                                            ArrayRef<ParserValue> Args,
                                            Diagnostics *Error);

  /// \param Marshaller Function to unpack the arguments and call \c Func
  /// \param Func Matcher construct function. This is the function that
  ///   compile-time matcher expressions would use to create the matcher.
  /// \param RetKinds The list of matcher types to which the matcher is
  ///   convertible.
  /// \param ArgKinds The types of the arguments this matcher takes.
  FixedArgCountMatcherDescriptor(MarshallerType Marshaller, void (*Func)(),
                                 StringRef MatcherName,
                                 ArrayRef<ASTNodeKind> RetKinds,
                                 ArrayRef<ArgKind> ArgKinds)
      : Marshaller(Marshaller), Func(Func), MatcherName(MatcherName),
        RetKinds(RetKinds.begin(), RetKinds.end()),
        ArgKinds(ArgKinds.begin(), ArgKinds.end()) {}

  VariantMatcher create(SourceRange NameRange,
                        ArrayRef<ParserValue> Args,
                        Diagnostics *Error) const override {
    return Marshaller(Func, MatcherName, NameRange, Args, Error);
  }

  bool isVariadic() const override { return false; }
  unsigned getNumArgs() const override { return ArgKinds.size(); }

  void getArgKinds(ASTNodeKind ThisKind, unsigned ArgNo,
                   std::vector<ArgKind> &Kinds) const override {
    Kinds.push_back(ArgKinds[ArgNo]);
  }

  bool isConvertibleTo(ASTNodeKind Kind, unsigned *Specificity,
                       ASTNodeKind *LeastDerivedKind) const override {
    return isRetKindConvertibleTo(RetKinds, Kind, Specificity,
                                  LeastDerivedKind);
  }

private:
  const MarshallerType Marshaller;
  void (* const Func)();
  const std::string MatcherName;
  const std::vector<ASTNodeKind> RetKinds;
  const std::vector<ArgKind> ArgKinds;
};

/// Helper methods to extract and merge all possible typed matchers
/// out of the polymorphic object.
template <class PolyMatcher>
static void mergePolyMatchers(const PolyMatcher &Poly,
                              std::vector<DynTypedMatcher> &Out,
                              ast_matchers::internal::EmptyTypeList) {}

template <class PolyMatcher, class TypeList>
static void mergePolyMatchers(const PolyMatcher &Poly,
                              std::vector<DynTypedMatcher> &Out, TypeList) {
  Out.push_back(ast_matchers::internal::Matcher<typename TypeList::head>(Poly));
  mergePolyMatchers(Poly, Out, typename TypeList::tail());
  Out.push_back(ast_matchers::internal::Matcher<typename TypeList::head>(Poly));

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Created: 2021-01-26 06:56