14 #ifndef LLVM_CLANG_AST_REDECLARABLE_H 15 #define LLVM_CLANG_AST_REDECLARABLE_H 18 #include "llvm/ADT/DenseMapInfo.h" 19 #include "llvm/ADT/PointerUnion.h" 20 #include "llvm/ADT/iterator_range.h" 21 #include "llvm/Support/Casting.h" 84 template<
typename decl_type>
97 using UninitializedLatest =
const void *;
104 using NotKnownLatest = llvm::PointerUnion<Previous, UninitializedLatest>;
106 mutable llvm::PointerUnion<NotKnownLatest, KnownLatest> Link;
113 : Link(NotKnownLatest(reinterpret_cast<UninitializedLatest>(&Ctx))) {}
120 Link.
get<NotKnownLatest>().template is<UninitializedLatest>();
124 if (Link.is<NotKnownLatest>()) {
125 NotKnownLatest NKL = Link.get<NotKnownLatest>();
127 return static_cast<decl_type*>(NKL.get<
Previous>());
130 Link =
KnownLatest(*reinterpret_cast<const ASTContext *>(
131 NKL.get<UninitializedLatest>()),
132 const_cast<decl_type *>(D));
135 return static_cast<decl_type*
>(Link.get<
KnownLatest>().
get(D));
139 assert(!
isFirst() &&
"decl became non-canonical unexpectedly");
144 assert(
isFirst() &&
"decl became canonical unexpectedly");
145 if (Link.is<NotKnownLatest>()) {
146 NotKnownLatest NKL = Link.get<NotKnownLatest>();
147 Link =
KnownLatest(*reinterpret_cast<const ASTContext *>(
148 NKL.get<UninitializedLatest>()),
160 assert(
isFirst() &&
"expected a canonical decl");
161 if (Link.is<NotKnownLatest>())
191 return RedeclLink.getPrevious(static_cast<const decl_type *>(
this));
200 First(static_cast<decl_type *>(this)) {}
205 if (!RedeclLink.isFirst())
210 return const_cast<decl_type *
>(
242 decl_type *Current =
nullptr;
244 bool PassedFirst =
false;
260 assert(Current &&
"Advancing while iterator has reached end");
262 if (Current->isFirstDecl()) {
264 assert(0 &&
"Passed first decl twice, invalid redecl chain!");
272 decl_type *Next = Current->getNextRedeclaration();
273 Current = (Next != Starter) ? Next :
nullptr;
284 return x.Current == y.Current;
287 return x.Current != y.Current;
296 return redecl_range(redecl_iterator(const_cast<decl_type *>(
297 static_cast<const decl_type *>(
this))),
312 template<
typename decl_type>
320 auto *D =
static_cast<decl_type *
>(
this);
329 const auto *D =
static_cast<const decl_type *
>(
this);
356 operator decl_type *() {
return Ptr; }
357 operator const decl_type *()
const {
return Ptr; }
368 decl_type *Ptr =
nullptr;
375 template <
typename decl_type>
384 P.Ptr = BaseInfo::getEmptyKey();
390 P.Ptr = BaseInfo::getTombstoneKey();
395 return BaseInfo::getHashValue(P);
400 return BaseInfo::isEqual(LHS, RHS);
406 #endif // LLVM_CLANG_AST_REDECLARABLE_H static const Decl * getCanonicalDecl(const Decl *D)
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
void setPreviousDecl(decl_type *PrevDecl)
Set the previous declaration.
Decl - This represents one declaration (or definition), e.g.
The l-value was an access to a declared entity or something equivalently strong, like the address of ...
static unsigned getHashValue(const CanonicalDeclPtr &P)
void setPrevious(decl_type *D)
virtual void CompleteRedeclChain(const Decl *D)
Gives the external AST source an opportunity to complete the redeclaration chain for a declaration...
static DeclLink LatestDeclLink(const ASTContext &Ctx)
DeclLink(LatestTag, const ASTContext &Ctx)
Provides common interface for the Decls that can be redeclared.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
static bool isEqual(const CanonicalDeclPtr &LHS, const CanonicalDeclPtr &RHS)
friend bool operator==(redecl_iterator x, redecl_iterator y)
decl_type * getPrevious(const decl_type *D) const
DeclLink(PreviousTag, decl_type *D)
const decl_type * getPreviousDecl() const
DeclLink RedeclLink
Points to the next redeclaration in the chain.
static CanonicalDeclPtr getEmptyKey()
decl_type * getFirstDecl()
Return the first declaration of this declaration or itself if this is the only declaration.
CanonicalDeclPtr(decl_type *Ptr)
static CanonicalDeclPtr getTombstoneKey()
std::ptrdiff_t difference_type
redecl_iterator operator++(int)
const decl_type & operator*() const
redecl_iterator redecls_begin() const
const decl_type * getMostRecentDecl() const
Returns the most recent (re)declaration of this declaration.
Iterates through all the redeclarations of the same decl.
static DeclLink PreviousDeclLink(decl_type *D)
Decl * getPrimaryMergedDecl(Decl *D)
Get the primary declaration for a declaration from an AST file.
pointer operator->() const
redecl_iterator & operator++()
T get(Owner O)
Get the value of this pointer, updating its owner if necessary.
decl_type * getFirstDecl()
Return the first declaration of this declaration or itself if this is the only declaration.
decl_type * getPreviousDecl()
Return the previous declaration of this declaration or NULL if this is the first declaration.
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Redeclarable(const ASTContext &Ctx)
const decl_type * operator->() const
bool isFirstDecl() const
True if this is the first declaration in its redeclaration chain.
const decl_type * getFirstDecl() const
Return the first declaration of this declaration or itself if this is the only declaration.
bool isFromASTFile() const
Determine whether this declaration came from an AST file (such as a precompiled header or module) rat...
__PTRDIFF_TYPE__ ptrdiff_t
A signed integer type that is the result of subtracting two pointers.
Dataflow Directional Tag Classes.
redecl_iterator redecls_end() const
llvm::iterator_range< redecl_iterator > redecl_range
void set(T NewValue)
Set the value of this pointer, in the current generation.
Provides common interface for the Decls that cannot be redeclared, but can be merged if the same decl...
friend bool operator!=(redecl_iterator x, redecl_iterator y)
void setLatest(decl_type *D)
Decl * getLatestNotUpdated() const
decl_type * getNextRedeclaration() const
redecl_iterator(decl_type *C)
const decl_type * getFirstDecl() const
Return the first declaration of this declaration or itself if this is the only declaration.
std::forward_iterator_tag iterator_category
decl_type * getMostRecentDecl()
Returns the most recent (re)declaration of this declaration.
A lazy value (of type T) that is within an AST node of type Owner, where the value might change in la...
reference operator*() const
bool isFirstDecl() const
Returns true if this is the first declaration.
A wrapper class around a pointer that always points to its canonical declaration. ...