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Diffstat (limited to 'include/clang/Parse/Ownership.h')
| -rw-r--r-- | include/clang/Parse/Ownership.h | 845 |
1 files changed, 0 insertions, 845 deletions
diff --git a/include/clang/Parse/Ownership.h b/include/clang/Parse/Ownership.h deleted file mode 100644 index e9a20b7872b5..000000000000 --- a/include/clang/Parse/Ownership.h +++ /dev/null @@ -1,845 +0,0 @@ -//===--- Ownership.h - Parser Ownership Helpers -----------------*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file contains classes for managing ownership of Stmt and Expr nodes. -// -//===----------------------------------------------------------------------===// - -#ifndef LLVM_CLANG_PARSE_OWNERSHIP_H -#define LLVM_CLANG_PARSE_OWNERSHIP_H - -#include "llvm/ADT/SmallVector.h" -#include "llvm/ADT/PointerIntPair.h" - -//===----------------------------------------------------------------------===// -// OpaquePtr -//===----------------------------------------------------------------------===// - -namespace clang { - class ActionBase; - - /// OpaquePtr - This is a very simple POD type that wraps a pointer that the - /// Parser doesn't know about but that Sema or another client does. The UID - /// template argument is used to make sure that "Decl" pointers are not - /// compatible with "Type" pointers for example. - template<int UID> - class OpaquePtr { - void *Ptr; - public: - OpaquePtr() : Ptr(0) {} - - template <typename T> - T* getAs() const { - return llvm::PointerLikeTypeTraits<T*>::getFromVoidPointer(Ptr); - } - - template <typename T> - T getAsVal() const { - return llvm::PointerLikeTypeTraits<T>::getFromVoidPointer(Ptr); - } - - void *get() const { return Ptr; } - - template<typename T> - static OpaquePtr make(T P) { - OpaquePtr R; R.set(P); return R; - } - - template<typename T> - void set(T P) { - Ptr = llvm::PointerLikeTypeTraits<T>::getAsVoidPointer(P); - } - - operator bool() const { return Ptr != 0; } - }; -} - -namespace llvm { - template <int UID> - class PointerLikeTypeTraits<clang::OpaquePtr<UID> > { - public: - static inline void *getAsVoidPointer(clang::OpaquePtr<UID> P) { - // FIXME: Doesn't work? return P.getAs< void >(); - return P.get(); - } - static inline clang::OpaquePtr<UID> getFromVoidPointer(void *P) { - return clang::OpaquePtr<UID>::make(P); - } - enum { NumLowBitsAvailable = 3 }; - }; -} - - - -// -------------------------- About Move Emulation -------------------------- // -// The smart pointer classes in this file attempt to emulate move semantics -// as they appear in C++0x with rvalue references. Since C++03 doesn't have -// rvalue references, some tricks are needed to get similar results. -// Move semantics in C++0x have the following properties: -// 1) "Moving" means transferring the value of an object to another object, -// similar to copying, but without caring what happens to the old object. -// In particular, this means that the new object can steal the old object's -// resources instead of creating a copy. -// 2) Since moving can modify the source object, it must either be explicitly -// requested by the user, or the modifications must be unnoticeable. -// 3) As such, C++0x moving is only allowed in three contexts: -// * By explicitly using std::move() to request it. -// * From a temporary object, since that object cannot be accessed -// afterwards anyway, thus making the state unobservable. -// * On function return, since the object is not observable afterwards. -// -// To sum up: moving from a named object should only be possible with an -// explicit std::move(), or on function return. Moving from a temporary should -// be implicitly done. Moving from a const object is forbidden. -// -// The emulation is not perfect, and has the following shortcomings: -// * move() is not in namespace std. -// * move() is required on function return. -// * There are difficulties with implicit conversions. -// * Microsoft's compiler must be given the /Za switch to successfully compile. -// -// -------------------------- Implementation -------------------------------- // -// The move emulation relies on the peculiar reference binding semantics of -// C++03: as a rule, a non-const reference may not bind to a temporary object, -// except for the implicit object parameter in a member function call, which -// can refer to a temporary even when not being const. -// The moveable object has five important functions to facilitate moving: -// * A private, unimplemented constructor taking a non-const reference to its -// own class. This constructor serves a two-fold purpose. -// - It prevents the creation of a copy constructor that takes a const -// reference. Temporaries would be able to bind to the argument of such a -// constructor, and that would be bad. -// - Named objects will bind to the non-const reference, but since it's -// private, this will fail to compile. This prevents implicit moving from -// named objects. -// There's also a copy assignment operator for the same purpose. -// * An implicit, non-const conversion operator to a special mover type. This -// type represents the rvalue reference of C++0x. Being a non-const member, -// its implicit this parameter can bind to temporaries. -// * A constructor that takes an object of this mover type. This constructor -// performs the actual move operation. There is an equivalent assignment -// operator. -// There is also a free move() function that takes a non-const reference to -// an object and returns a temporary. Internally, this function uses explicit -// constructor calls to move the value from the referenced object to the return -// value. -// -// There are now three possible scenarios of use. -// * Copying from a const object. Constructor overload resolution will find the -// non-const copy constructor, and the move constructor. The first is not -// viable because the const object cannot be bound to the non-const reference. -// The second fails because the conversion to the mover object is non-const. -// Moving from a const object fails as intended. -// * Copying from a named object. Constructor overload resolution will select -// the non-const copy constructor, but fail as intended, because this -// constructor is private. -// * Copying from a temporary. Constructor overload resolution cannot select -// the non-const copy constructor, because the temporary cannot be bound to -// the non-const reference. It thus selects the move constructor. The -// temporary can be bound to the implicit this parameter of the conversion -// operator, because of the special binding rule. Construction succeeds. -// Note that the Microsoft compiler, as an extension, allows binding -// temporaries against non-const references. The compiler thus selects the -// non-const copy constructor and fails, because the constructor is private. -// Passing /Za (disable extensions) disables this behaviour. -// The free move() function is used to move from a named object. -// -// Note that when passing an object of a different type (the classes below -// have OwningResult and OwningPtr, which should be mixable), you get a problem. -// Argument passing and function return use copy initialization rules. The -// effect of this is that, when the source object is not already of the target -// type, the compiler will first seek a way to convert the source object to the -// target type, and only then attempt to copy the resulting object. This means -// that when passing an OwningResult where an OwningPtr is expected, the -// compiler will first seek a conversion from OwningResult to OwningPtr, then -// copy the OwningPtr. The resulting conversion sequence is: -// OwningResult object -> ResultMover -> OwningResult argument to -// OwningPtr(OwningResult) -> OwningPtr -> PtrMover -> final OwningPtr -// This conversion sequence is too complex to be allowed. Thus the special -// move_* functions, which help the compiler out with some explicit -// conversions. - -// Flip this switch to measure performance impact of the smart pointers. -// #define DISABLE_SMART_POINTERS - -namespace llvm { - template<> - class PointerLikeTypeTraits<clang::ActionBase*> { - typedef clang::ActionBase* PT; - public: - static inline void *getAsVoidPointer(PT P) { return P; } - static inline PT getFromVoidPointer(void *P) { - return static_cast<PT>(P); - } - enum { NumLowBitsAvailable = 2 }; - }; -} - -namespace clang { - // Basic - class DiagnosticBuilder; - - // Determines whether the low bit of the result pointer for the - // given UID is always zero. If so, ActionResult will use that bit - // for it's "invalid" flag. - template<unsigned UID> - struct IsResultPtrLowBitFree { - static const bool value = false; - }; - - /// ActionBase - A small part split from Action because of the horrible - /// definition order dependencies between Action and the smart pointers. - class ActionBase { - public: - /// Out-of-line virtual destructor to provide home for this class. - virtual ~ActionBase(); - - // Types - Though these don't actually enforce strong typing, they document - // what types are required to be identical for the actions. - typedef OpaquePtr<0> DeclPtrTy; - typedef OpaquePtr<1> DeclGroupPtrTy; - typedef OpaquePtr<2> TemplateTy; - typedef void AttrTy; - typedef void BaseTy; - typedef void MemInitTy; - typedef void ExprTy; - typedef void StmtTy; - typedef void TemplateParamsTy; - typedef void CXXScopeTy; - typedef void TypeTy; // FIXME: Change TypeTy to use OpaquePtr<N>. - - /// ActionResult - This structure is used while parsing/acting on - /// expressions, stmts, etc. It encapsulates both the object returned by - /// the action, plus a sense of whether or not it is valid. - /// When CompressInvalid is true, the "invalid" flag will be - /// stored in the low bit of the Val pointer. - template<unsigned UID, - typename PtrTy = void*, - bool CompressInvalid = IsResultPtrLowBitFree<UID>::value> - class ActionResult { - PtrTy Val; - bool Invalid; - - public: - ActionResult(bool Invalid = false) : Val(PtrTy()), Invalid(Invalid) {} - template<typename ActualExprTy> - ActionResult(ActualExprTy val) : Val(val), Invalid(false) {} - ActionResult(const DiagnosticBuilder &) : Val(PtrTy()), Invalid(true) {} - - PtrTy get() const { return Val; } - void set(PtrTy V) { Val = V; } - bool isInvalid() const { return Invalid; } - - const ActionResult &operator=(PtrTy RHS) { - Val = RHS; - Invalid = false; - return *this; - } - }; - - // This ActionResult partial specialization places the "invalid" - // flag into the low bit of the pointer. - template<unsigned UID, typename PtrTy> - class ActionResult<UID, PtrTy, true> { - // A pointer whose low bit is 1 if this result is invalid, 0 - // otherwise. - uintptr_t PtrWithInvalid; - typedef llvm::PointerLikeTypeTraits<PtrTy> PtrTraits; - public: - ActionResult(bool Invalid = false) - : PtrWithInvalid(static_cast<uintptr_t>(Invalid)) { } - - template<typename ActualExprTy> - ActionResult(ActualExprTy *val) { - PtrTy V(val); - void *VP = PtrTraits::getAsVoidPointer(V); - PtrWithInvalid = reinterpret_cast<uintptr_t>(VP); - assert((PtrWithInvalid & 0x01) == 0 && "Badly aligned pointer"); - } - - ActionResult(PtrTy V) { - void *VP = PtrTraits::getAsVoidPointer(V); - PtrWithInvalid = reinterpret_cast<uintptr_t>(VP); - assert((PtrWithInvalid & 0x01) == 0 && "Badly aligned pointer"); - } - - ActionResult(const DiagnosticBuilder &) : PtrWithInvalid(0x01) { } - - PtrTy get() const { - void *VP = reinterpret_cast<void *>(PtrWithInvalid & ~0x01); - return PtrTraits::getFromVoidPointer(VP); - } - - void set(PtrTy V) { - void *VP = PtrTraits::getAsVoidPointer(V); - PtrWithInvalid = reinterpret_cast<uintptr_t>(VP); - assert((PtrWithInvalid & 0x01) == 0 && "Badly aligned pointer"); - } - - bool isInvalid() const { return PtrWithInvalid & 0x01; } - - const ActionResult &operator=(PtrTy RHS) { - void *VP = PtrTraits::getAsVoidPointer(RHS); - PtrWithInvalid = reinterpret_cast<uintptr_t>(VP); - assert((PtrWithInvalid & 0x01) == 0 && "Badly aligned pointer"); - return *this; - } - }; - - /// Deletion callbacks - Since the parser doesn't know the concrete types of - /// the AST nodes being generated, it must do callbacks to delete objects - /// when recovering from errors. These are in ActionBase because the smart - /// pointers need access to them. - virtual void DeleteExpr(ExprTy *E) {} - virtual void DeleteStmt(StmtTy *S) {} - virtual void DeleteTemplateParams(TemplateParamsTy *P) {} - }; - - /// ASTDestroyer - The type of an AST node destruction function pointer. - typedef void (ActionBase::*ASTDestroyer)(void *); - - /// For the transition phase: translate from an ASTDestroyer to its - /// ActionResult UID. - template <ASTDestroyer Destroyer> struct DestroyerToUID; - template <> struct DestroyerToUID<&ActionBase::DeleteExpr> { - static const unsigned UID = 0; - }; - template <> struct DestroyerToUID<&ActionBase::DeleteStmt> { - static const unsigned UID = 1; - }; - /// ASTOwningResult - A moveable smart pointer for AST nodes that also - /// has an extra flag to indicate an additional success status. - template <ASTDestroyer Destroyer> class ASTOwningResult; - - /// ASTMultiPtr - A moveable smart pointer to multiple AST nodes. Only owns - /// the individual pointers, not the array holding them. - template <ASTDestroyer Destroyer> class ASTMultiPtr; - -#if !defined(DISABLE_SMART_POINTERS) - namespace moving { - /// Move emulation helper for ASTOwningResult. NEVER EVER use this class - /// directly if you don't know what you're doing. - template <ASTDestroyer Destroyer> - class ASTResultMover { - ASTOwningResult<Destroyer> &Moved; - - public: - ASTResultMover(ASTOwningResult<Destroyer> &moved) : Moved(moved) {} - - ASTOwningResult<Destroyer> * operator ->() { return &Moved; } - }; - - /// Move emulation helper for ASTMultiPtr. NEVER EVER use this class - /// directly if you don't know what you're doing. - template <ASTDestroyer Destroyer> - class ASTMultiMover { - ASTMultiPtr<Destroyer> &Moved; - - public: - ASTMultiMover(ASTMultiPtr<Destroyer> &moved) : Moved(moved) {} - - ASTMultiPtr<Destroyer> * operator ->() { return &Moved; } - - /// Reset the moved object's internal structures. - void release(); - }; - } -#else - - /// Kept only as a type-safe wrapper for a void pointer, when smart pointers - /// are disabled. When they are enabled, ASTOwningResult takes over. - template <ASTDestroyer Destroyer> - class ASTOwningPtr { - void *Node; - - public: - explicit ASTOwningPtr(ActionBase &) : Node(0) {} - ASTOwningPtr(ActionBase &, void *node) : Node(node) {} - // Normal copying operators are defined implicitly. - ASTOwningPtr(const ASTOwningResult<Destroyer> &o); - - ASTOwningPtr & operator =(void *raw) { - Node = raw; - return *this; - } - - /// Access to the raw pointer. - void * get() const { return Node; } - - /// Release the raw pointer. - void * take() { - return Node; - } - - /// Take outside ownership of the raw pointer and cast it down. - template<typename T> - T *takeAs() { - return static_cast<T*>(Node); - } - - /// Alias for interface familiarity with unique_ptr. - void * release() { - return take(); - } - }; -#endif - - // Important: There are two different implementations of - // ASTOwningResult below, depending on whether - // DISABLE_SMART_POINTERS is defined. If you make changes that - // affect the interface, be sure to compile and test both ways! - -#if !defined(DISABLE_SMART_POINTERS) - template <ASTDestroyer Destroyer> - class ASTOwningResult { - llvm::PointerIntPair<ActionBase*, 1, bool> ActionInv; - void *Ptr; - - friend class moving::ASTResultMover<Destroyer>; - -#if !(defined(_MSC_VER) && _MSC_VER >= 1600) - ASTOwningResult(ASTOwningResult&); // DO NOT IMPLEMENT - ASTOwningResult& operator =(ASTOwningResult&); // DO NOT IMPLEMENT -#endif - - void destroy() { - if (Ptr) { - assert(ActionInv.getPointer() && - "Smart pointer has node but no action."); - (ActionInv.getPointer()->*Destroyer)(Ptr); - Ptr = 0; - } - } - - public: - typedef ActionBase::ActionResult<DestroyerToUID<Destroyer>::UID> DumbResult; - - explicit ASTOwningResult(ActionBase &actions, bool invalid = false) - : ActionInv(&actions, invalid), Ptr(0) {} - ASTOwningResult(ActionBase &actions, void *node) - : ActionInv(&actions, false), Ptr(node) {} - ASTOwningResult(ActionBase &actions, const DumbResult &res) - : ActionInv(&actions, res.isInvalid()), Ptr(res.get()) {} - /// Move from another owning result - ASTOwningResult(moving::ASTResultMover<Destroyer> mover) - : ActionInv(mover->ActionInv), - Ptr(mover->Ptr) { - mover->Ptr = 0; - } - - ~ASTOwningResult() { - destroy(); - } - - /// Move assignment from another owning result - ASTOwningResult &operator=(moving::ASTResultMover<Destroyer> mover) { - destroy(); - ActionInv = mover->ActionInv; - Ptr = mover->Ptr; - mover->Ptr = 0; - return *this; - } - -#if defined(_MSC_VER) && _MSC_VER >= 1600 - // Emulated move semantics don't work with msvc. - ASTOwningResult(ASTOwningResult &&mover) - : ActionInv(mover.ActionInv), - Ptr(mover.Ptr) { - mover.Ptr = 0; - } - ASTOwningResult &operator=(ASTOwningResult &&mover) { - *this = moving::ASTResultMover<Destroyer>(mover); - return *this; - } -#endif - - /// Assignment from a raw pointer. Takes ownership - beware! - ASTOwningResult &operator=(void *raw) { - destroy(); - Ptr = raw; - ActionInv.setInt(false); - return *this; - } - - /// Assignment from an ActionResult. Takes ownership - beware! - ASTOwningResult &operator=(const DumbResult &res) { - destroy(); - Ptr = res.get(); - ActionInv.setInt(res.isInvalid()); - return *this; - } - - /// Access to the raw pointer. - void *get() const { return Ptr; } - - bool isInvalid() const { return ActionInv.getInt(); } - - /// Does this point to a usable AST node? To be usable, the node must be - /// valid and non-null. - bool isUsable() const { return !isInvalid() && get(); } - - /// Take outside ownership of the raw pointer. - void *take() { - if (isInvalid()) - return 0; - void *tmp = Ptr; - Ptr = 0; - return tmp; - } - - /// Take outside ownership of the raw pointer and cast it down. - template<typename T> - T *takeAs() { - return static_cast<T*>(take()); - } - - /// Alias for interface familiarity with unique_ptr. - void *release() { return take(); } - - /// Pass ownership to a classical ActionResult. - DumbResult result() { - if (isInvalid()) - return true; - return take(); - } - - /// Move hook - operator moving::ASTResultMover<Destroyer>() { - return moving::ASTResultMover<Destroyer>(*this); - } - }; -#else - template <ASTDestroyer Destroyer> - class ASTOwningResult { - public: - typedef ActionBase::ActionResult<DestroyerToUID<Destroyer>::UID> DumbResult; - - private: - DumbResult Result; - - public: - explicit ASTOwningResult(ActionBase &actions, bool invalid = false) - : Result(invalid) { } - ASTOwningResult(ActionBase &actions, void *node) : Result(node) { } - ASTOwningResult(ActionBase &actions, const DumbResult &res) : Result(res) { } - // Normal copying semantics are defined implicitly. - ASTOwningResult(const ASTOwningPtr<Destroyer> &o) : Result(o.get()) { } - - /// Assignment from a raw pointer. Takes ownership - beware! - ASTOwningResult & operator =(void *raw) { - Result = raw; - return *this; - } - - /// Assignment from an ActionResult. Takes ownership - beware! - ASTOwningResult & operator =(const DumbResult &res) { - Result = res; - return *this; - } - - /// Access to the raw pointer. - void * get() const { return Result.get(); } - - bool isInvalid() const { return Result.isInvalid(); } - - /// Does this point to a usable AST node? To be usable, the node must be - /// valid and non-null. - bool isUsable() const { return !Result.isInvalid() && get(); } - - /// Take outside ownership of the raw pointer. - void * take() { - return Result.get(); - } - - /// Take outside ownership of the raw pointer and cast it down. - template<typename T> - T *takeAs() { - return static_cast<T*>(take()); - } - - /// Alias for interface familiarity with unique_ptr. - void * release() { return take(); } - - /// Pass ownership to a classical ActionResult. - DumbResult result() { return Result; } - }; -#endif - - template <ASTDestroyer Destroyer> - class ASTMultiPtr { -#if !defined(DISABLE_SMART_POINTERS) - ActionBase &Actions; -#endif - void **Nodes; - unsigned Count; - -#if !defined(DISABLE_SMART_POINTERS) - friend class moving::ASTMultiMover<Destroyer>; - -#if defined(_MSC_VER) - // Last tested with Visual Studio 2008. - // Visual C++ appears to have a bug where it does not recognise - // the return value from ASTMultiMover<Destroyer>::opeator-> as - // being a pointer to ASTMultiPtr. However, the diagnostics - // suggest it has the right name, simply that the pointer type - // is not convertible to itself. - // Either way, a classic C-style hard cast resolves any issue. - static ASTMultiPtr* hack(moving::ASTMultiMover<Destroyer> & source) { - return (ASTMultiPtr*)source.operator->(); - } -#endif - - ASTMultiPtr(ASTMultiPtr&); // DO NOT IMPLEMENT - // Reference member prevents copy assignment. - - void destroy() { - assert((Count == 0 || Nodes) && "No nodes when count is not zero."); - for (unsigned i = 0; i < Count; ++i) { - if (Nodes[i]) - (Actions.*Destroyer)(Nodes[i]); - } - } -#endif - - public: -#if !defined(DISABLE_SMART_POINTERS) - explicit ASTMultiPtr(ActionBase &actions) - : Actions(actions), Nodes(0), Count(0) {} - ASTMultiPtr(ActionBase &actions, void **nodes, unsigned count) - : Actions(actions), Nodes(nodes), Count(count) {} - /// Move constructor - ASTMultiPtr(moving::ASTMultiMover<Destroyer> mover) -#if defined(_MSC_VER) - // Apply the visual C++ hack supplied above. - // Last tested with Visual Studio 2008. - : Actions(hack(mover)->Actions), Nodes(hack(mover)->Nodes), Count(hack(mover)->Count) { -#else - : Actions(mover->Actions), Nodes(mover->Nodes), Count(mover->Count) { -#endif - mover.release(); - } -#else - // Normal copying implicitly defined - explicit ASTMultiPtr(ActionBase &) : Nodes(0), Count(0) {} - ASTMultiPtr(ActionBase &, void **nodes, unsigned count) - : Nodes(nodes), Count(count) {} - // Fake mover in Parse/AstGuard.h needs this: - ASTMultiPtr(void **nodes, unsigned count) : Nodes(nodes), Count(count) {} -#endif - -#if !defined(DISABLE_SMART_POINTERS) - /// Move assignment - ASTMultiPtr & operator =(moving::ASTMultiMover<Destroyer> mover) { - destroy(); - Nodes = mover->Nodes; - Count = mover->Count; - mover.release(); - return *this; - } -#endif - - /// Access to the raw pointers. - void ** get() const { return Nodes; } - - /// Access to the count. - unsigned size() const { return Count; } - - void ** release() { -#if !defined(DISABLE_SMART_POINTERS) - void **tmp = Nodes; - Nodes = 0; - Count = 0; - return tmp; -#else - return Nodes; -#endif - } - -#if !defined(DISABLE_SMART_POINTERS) - /// Move hook - operator moving::ASTMultiMover<Destroyer>() { - return moving::ASTMultiMover<Destroyer>(*this); - } -#endif - }; - - class ParsedTemplateArgument; - - class ASTTemplateArgsPtr { -#if !defined(DISABLE_SMART_POINTERS) - ActionBase &Actions; -#endif - ParsedTemplateArgument *Args; - mutable unsigned Count; - -#if !defined(DISABLE_SMART_POINTERS) - void destroy(); -#endif - - public: - ASTTemplateArgsPtr(ActionBase &actions, ParsedTemplateArgument *args, - unsigned count) : -#if !defined(DISABLE_SMART_POINTERS) - Actions(actions), -#endif - Args(args), Count(count) { } - - // FIXME: Lame, not-fully-type-safe emulation of 'move semantics'. - ASTTemplateArgsPtr(ASTTemplateArgsPtr &Other) : -#if !defined(DISABLE_SMART_POINTERS) - Actions(Other.Actions), -#endif - Args(Other.Args), Count(Other.Count) { -#if !defined(DISABLE_SMART_POINTERS) - Other.Count = 0; -#endif - } - - // FIXME: Lame, not-fully-type-safe emulation of 'move semantics'. - ASTTemplateArgsPtr& operator=(ASTTemplateArgsPtr &Other) { -#if !defined(DISABLE_SMART_POINTERS) - Actions = Other.Actions; -#endif - Args = Other.Args; - Count = Other.Count; -#if !defined(DISABLE_SMART_POINTERS) - Other.Count = 0; -#endif - return *this; - } - -#if !defined(DISABLE_SMART_POINTERS) - ~ASTTemplateArgsPtr() { destroy(); } -#endif - - ParsedTemplateArgument *getArgs() const { return Args; } - unsigned size() const { return Count; } - - void reset(ParsedTemplateArgument *args, unsigned count) { -#if !defined(DISABLE_SMART_POINTERS) - destroy(); -#endif - Args = args; - Count = count; - } - - const ParsedTemplateArgument &operator[](unsigned Arg) const; - - ParsedTemplateArgument *release() const { -#if !defined(DISABLE_SMART_POINTERS) - Count = 0; -#endif - return Args; - } - }; - - /// \brief A small vector that owns a set of AST nodes. - template <ASTDestroyer Destroyer, unsigned N = 8> - class ASTOwningVector : public llvm::SmallVector<void *, N> { -#if !defined(DISABLE_SMART_POINTERS) - ActionBase &Actions; - bool Owned; -#endif - - ASTOwningVector(ASTOwningVector &); // do not implement - ASTOwningVector &operator=(ASTOwningVector &); // do not implement - - public: - explicit ASTOwningVector(ActionBase &Actions) -#if !defined(DISABLE_SMART_POINTERS) - : Actions(Actions), Owned(true) -#endif - { } - -#if !defined(DISABLE_SMART_POINTERS) - ~ASTOwningVector() { - if (!Owned) - return; - - for (unsigned I = 0, Last = this->size(); I != Last; ++I) - (Actions.*Destroyer)((*this)[I]); - } -#endif - - void **take() { -#if !defined(DISABLE_SMART_POINTERS) - Owned = false; -#endif - return &this->front(); - } - - template<typename T> T **takeAs() { return (T**)take(); } - -#if !defined(DISABLE_SMART_POINTERS) - ActionBase &getActions() const { return Actions; } -#endif - }; - - /// A SmallVector of statements, with stack size 32 (as that is the only one - /// used.) - typedef ASTOwningVector<&ActionBase::DeleteStmt, 32> StmtVector; - /// A SmallVector of expressions, with stack size 12 (the maximum used.) - typedef ASTOwningVector<&ActionBase::DeleteExpr, 12> ExprVector; - - template <ASTDestroyer Destroyer, unsigned N> inline - ASTMultiPtr<Destroyer> move_arg(ASTOwningVector<Destroyer, N> &vec) { -#if !defined(DISABLE_SMART_POINTERS) - return ASTMultiPtr<Destroyer>(vec.getActions(), vec.take(), vec.size()); -#else - return ASTMultiPtr<Destroyer>(vec.take(), vec.size()); -#endif - } - -#if !defined(DISABLE_SMART_POINTERS) - - // Out-of-line implementations due to definition dependencies - - template <ASTDestroyer Destroyer> inline - void moving::ASTMultiMover<Destroyer>::release() { - Moved.Nodes = 0; - Moved.Count = 0; - } - - // Move overloads. - - template <ASTDestroyer Destroyer> inline - ASTOwningResult<Destroyer> move(ASTOwningResult<Destroyer> &ptr) { - return ASTOwningResult<Destroyer>(moving::ASTResultMover<Destroyer>(ptr)); - } - - template <ASTDestroyer Destroyer> inline - ASTMultiPtr<Destroyer> move(ASTMultiPtr<Destroyer> &ptr) { - return ASTMultiPtr<Destroyer>(moving::ASTMultiMover<Destroyer>(ptr)); - } - -#else - - template <ASTDestroyer Destroyer> inline - ASTOwningPtr<Destroyer>::ASTOwningPtr(const ASTOwningResult<Destroyer> &o) - : Node(o.get()) { } - - // These versions are hopefully no-ops. - template <ASTDestroyer Destroyer> inline - ASTOwningResult<Destroyer>& move(ASTOwningResult<Destroyer> &ptr) { - return ptr; - } - - template <ASTDestroyer Destroyer> inline - ASTOwningPtr<Destroyer>& move(ASTOwningPtr<Destroyer> &ptr) { - return ptr; - } - - template <ASTDestroyer Destroyer> inline - ASTMultiPtr<Destroyer>& move(ASTMultiPtr<Destroyer> &ptr) { - return ptr; - } -#endif -} - -#endif |