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-rw-r--r--include/clang/Sema/Ownership.h287
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diff --git a/include/clang/Sema/Ownership.h b/include/clang/Sema/Ownership.h
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--- a/include/clang/Sema/Ownership.h
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-//===--- 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_SEMA_OWNERSHIP_H
-#define LLVM_CLANG_SEMA_OWNERSHIP_H
-
-#include "clang/Basic/LLVM.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/PointerIntPair.h"
-
-//===----------------------------------------------------------------------===//
-// OpaquePtr
-//===----------------------------------------------------------------------===//
-
-namespace clang {
- class CXXCtorInitializer;
- class CXXBaseSpecifier;
- class Decl;
- class Expr;
- class ParsedTemplateArgument;
- class QualType;
- class Stmt;
- class TemplateName;
- class TemplateParameterList;
-
- /// \brief Wrapper for void* pointer.
- /// \tparam PtrTy Either a pointer type like 'T*' or a type that behaves like
- /// a pointer.
- ///
- /// 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 PtrTy
- /// template argument is used to make sure that "Decl" pointers are not
- /// compatible with "Type" pointers for example.
- template <class PtrTy>
- class OpaquePtr {
- void *Ptr;
- explicit OpaquePtr(void *Ptr) : Ptr(Ptr) {}
-
- typedef llvm::PointerLikeTypeTraits<PtrTy> Traits;
-
- public:
- OpaquePtr() : Ptr(nullptr) {}
-
- static OpaquePtr make(PtrTy P) { OpaquePtr OP; OP.set(P); return OP; }
-
- /// \brief Returns plain pointer to the entity pointed by this wrapper.
- /// \tparam PointeeT Type of pointed entity.
- ///
- /// It is identical to getPtrAs<PointeeT*>.
- template <typename PointeeT> PointeeT* getPtrTo() const {
- return get();
- }
-
- /// \brief Returns pointer converted to the specified type.
- /// \tparam PtrT Result pointer type. There must be implicit conversion
- /// from PtrTy to PtrT.
- ///
- /// In contrast to getPtrTo, this method allows the return type to be
- /// a smart pointer.
- template <typename PtrT> PtrT getPtrAs() const {
- return get();
- }
-
- PtrTy get() const {
- return Traits::getFromVoidPointer(Ptr);
- }
-
- void set(PtrTy P) {
- Ptr = Traits::getAsVoidPointer(P);
- }
-
- explicit operator bool() const { return Ptr != nullptr; }
-
- void *getAsOpaquePtr() const { return Ptr; }
- static OpaquePtr getFromOpaquePtr(void *P) { return OpaquePtr(P); }
- };
-
- /// UnionOpaquePtr - A version of OpaquePtr suitable for membership
- /// in a union.
- template <class T> struct UnionOpaquePtr {
- void *Ptr;
-
- static UnionOpaquePtr make(OpaquePtr<T> P) {
- UnionOpaquePtr OP = { P.getAsOpaquePtr() };
- return OP;
- }
-
- OpaquePtr<T> get() const { return OpaquePtr<T>::getFromOpaquePtr(Ptr); }
- operator OpaquePtr<T>() const { return get(); }
-
- UnionOpaquePtr &operator=(OpaquePtr<T> P) {
- Ptr = P.getAsOpaquePtr();
- return *this;
- }
- };
-}
-
-namespace llvm {
- template <class T>
- class PointerLikeTypeTraits<clang::OpaquePtr<T> > {
- public:
- static inline void *getAsVoidPointer(clang::OpaquePtr<T> P) {
- // FIXME: Doesn't work? return P.getAs< void >();
- return P.getAsOpaquePtr();
- }
- static inline clang::OpaquePtr<T> getFromVoidPointer(void *P) {
- return clang::OpaquePtr<T>::getFromOpaquePtr(P);
- }
- enum { NumLowBitsAvailable = 0 };
- };
-
- template <class T>
- struct isPodLike<clang::OpaquePtr<T> > { static const bool value = true; };
-}
-
-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<class Ptr>
- struct IsResultPtrLowBitFree {
- static const bool value = false;
- };
-
- /// 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<class PtrTy,
- bool CompressInvalid = IsResultPtrLowBitFree<PtrTy>::value>
- class ActionResult {
- PtrTy Val;
- bool Invalid;
-
- public:
- ActionResult(bool Invalid = false)
- : Val(PtrTy()), Invalid(Invalid) {}
- ActionResult(PtrTy val) : Val(val), Invalid(false) {}
- ActionResult(const DiagnosticBuilder &) : Val(PtrTy()), Invalid(true) {}
-
- // These two overloads prevent void* -> bool conversions.
- ActionResult(const void *);
- ActionResult(volatile void *);
-
- bool isInvalid() const { return Invalid; }
- bool isUsable() const { return !Invalid && Val; }
- bool isUnset() const { return !Invalid && !Val; }
-
- PtrTy get() const { return Val; }
- template <typename T> T *getAs() { return static_cast<T*>(get()); }
-
- void set(PtrTy V) { Val = V; }
-
- 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<typename PtrTy>
- class ActionResult<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)) { }
-
- 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) { }
-
- // These two overloads prevent void* -> bool conversions.
- ActionResult(const void *);
- ActionResult(volatile void *);
-
- bool isInvalid() const { return PtrWithInvalid & 0x01; }
- bool isUsable() const { return PtrWithInvalid > 0x01; }
- bool isUnset() const { return PtrWithInvalid == 0; }
-
- PtrTy get() const {
- void *VP = reinterpret_cast<void *>(PtrWithInvalid & ~0x01);
- return PtrTraits::getFromVoidPointer(VP);
- }
- template <typename T> T *getAs() { return static_cast<T*>(get()); }
-
- void set(PtrTy V) {
- void *VP = PtrTraits::getAsVoidPointer(V);
- PtrWithInvalid = reinterpret_cast<uintptr_t>(VP);
- assert((PtrWithInvalid & 0x01) == 0 && "Badly aligned pointer");
- }
-
- 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;
- }
-
- // For types where we can fit a flag in with the pointer, provide
- // conversions to/from pointer type.
- static ActionResult getFromOpaquePointer(void *P) {
- ActionResult Result;
- Result.PtrWithInvalid = (uintptr_t)P;
- return Result;
- }
- void *getAsOpaquePointer() const { return (void*)PtrWithInvalid; }
- };
-
- /// An opaque type for threading parsed type information through the
- /// parser.
- typedef OpaquePtr<QualType> ParsedType;
- typedef UnionOpaquePtr<QualType> UnionParsedType;
-
- // We can re-use the low bit of expression, statement, base, and
- // member-initializer pointers for the "invalid" flag of
- // ActionResult.
- template<> struct IsResultPtrLowBitFree<Expr*> {
- static const bool value = true;
- };
- template<> struct IsResultPtrLowBitFree<Stmt*> {
- static const bool value = true;
- };
- template<> struct IsResultPtrLowBitFree<CXXBaseSpecifier*> {
- static const bool value = true;
- };
- template<> struct IsResultPtrLowBitFree<CXXCtorInitializer*> {
- static const bool value = true;
- };
-
- typedef ActionResult<Expr*> ExprResult;
- typedef ActionResult<Stmt*> StmtResult;
- typedef ActionResult<ParsedType> TypeResult;
- typedef ActionResult<CXXBaseSpecifier*> BaseResult;
- typedef ActionResult<CXXCtorInitializer*> MemInitResult;
-
- typedef ActionResult<Decl*> DeclResult;
- typedef OpaquePtr<TemplateName> ParsedTemplateTy;
-
- typedef MutableArrayRef<Expr*> MultiExprArg;
- typedef MutableArrayRef<Stmt*> MultiStmtArg;
- typedef MutableArrayRef<ParsedTemplateArgument> ASTTemplateArgsPtr;
- typedef MutableArrayRef<ParsedType> MultiTypeArg;
- typedef MutableArrayRef<TemplateParameterList*> MultiTemplateParamsArg;
-
- inline ExprResult ExprError() { return ExprResult(true); }
- inline StmtResult StmtError() { return StmtResult(true); }
-
- inline ExprResult ExprError(const DiagnosticBuilder&) { return ExprError(); }
- inline StmtResult StmtError(const DiagnosticBuilder&) { return StmtError(); }
-
- inline ExprResult ExprEmpty() { return ExprResult(false); }
- inline StmtResult StmtEmpty() { return StmtResult(false); }
-
- inline Expr *AssertSuccess(ExprResult R) {
- assert(!R.isInvalid() && "operation was asserted to never fail!");
- return R.get();
- }
-
- inline Stmt *AssertSuccess(StmtResult R) {
- assert(!R.isInvalid() && "operation was asserted to never fail!");
- return R.get();
- }
-}
-
-#endif
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