| //===- IdentifierResolver.cpp - Lexical Scope Name lookup -------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the IdentifierResolver class, which is used for lexical |
| // scoped lookup, based on declaration names. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "IdentifierResolver.h" |
| #include "clang/Basic/LangOptions.h" |
| |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // IdDeclInfoMap class |
| //===----------------------------------------------------------------------===// |
| |
| /// IdDeclInfoMap - Associates IdDeclInfos with declaration names. |
| /// Allocates 'pools' (vectors of IdDeclInfos) to avoid allocating each |
| /// individual IdDeclInfo to heap. |
| class IdentifierResolver::IdDeclInfoMap { |
| static const unsigned int POOL_SIZE = 512; |
| |
| /// We use our own linked-list implementation because it is sadly |
| /// impossible to add something to a pre-C++0x STL container without |
| /// a completely unnecessary copy. |
| struct IdDeclInfoPool { |
| IdDeclInfoPool(IdDeclInfoPool *Next) : Next(Next) {} |
| |
| IdDeclInfoPool *Next; |
| IdDeclInfo Pool[POOL_SIZE]; |
| }; |
| |
| IdDeclInfoPool *CurPool; |
| unsigned int CurIndex; |
| |
| public: |
| IdDeclInfoMap() : CurPool(0), CurIndex(POOL_SIZE) {} |
| |
| ~IdDeclInfoMap() { |
| IdDeclInfoPool *Cur = CurPool; |
| while (IdDeclInfoPool *P = Cur) { |
| Cur = Cur->Next; |
| delete P; |
| } |
| } |
| |
| /// Returns the IdDeclInfo associated to the DeclarationName. |
| /// It creates a new IdDeclInfo if one was not created before for this id. |
| IdDeclInfo &operator[](DeclarationName Name); |
| }; |
| |
| |
| //===----------------------------------------------------------------------===// |
| // IdDeclInfo Implementation |
| //===----------------------------------------------------------------------===// |
| |
| /// RemoveDecl - Remove the decl from the scope chain. |
| /// The decl must already be part of the decl chain. |
| void IdentifierResolver::IdDeclInfo::RemoveDecl(NamedDecl *D) { |
| for (DeclsTy::iterator I = Decls.end(); I != Decls.begin(); --I) { |
| if (D == *(I-1)) { |
| Decls.erase(I-1); |
| return; |
| } |
| } |
| |
| assert(0 && "Didn't find this decl on its identifier's chain!"); |
| } |
| |
| bool |
| IdentifierResolver::IdDeclInfo::ReplaceDecl(NamedDecl *Old, NamedDecl *New) { |
| for (DeclsTy::iterator I = Decls.end(); I != Decls.begin(); --I) { |
| if (Old == *(I-1)) { |
| *(I - 1) = New; |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // IdentifierResolver Implementation |
| //===----------------------------------------------------------------------===// |
| |
| IdentifierResolver::IdentifierResolver(const LangOptions &langOpt) |
| : LangOpt(langOpt), IdDeclInfos(new IdDeclInfoMap) { |
| } |
| IdentifierResolver::~IdentifierResolver() { |
| delete IdDeclInfos; |
| } |
| |
| /// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true |
| /// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns |
| /// true if 'D' belongs to the given declaration context. |
| bool IdentifierResolver::isDeclInScope(Decl *D, DeclContext *Ctx, |
| ASTContext &Context, Scope *S) const { |
| Ctx = Ctx->getLookupContext(); |
| |
| if (Ctx->isFunctionOrMethod()) { |
| // Ignore the scopes associated within transparent declaration contexts. |
| while (S->getEntity() && |
| ((DeclContext *)S->getEntity())->isTransparentContext()) |
| S = S->getParent(); |
| |
| if (S->isDeclScope(Action::DeclPtrTy::make(D))) |
| return true; |
| if (LangOpt.CPlusPlus) { |
| // C++ 3.3.2p3: |
| // The name declared in a catch exception-declaration is local to the |
| // handler and shall not be redeclared in the outermost block of the |
| // handler. |
| // C++ 3.3.2p4: |
| // Names declared in the for-init-statement, and in the condition of if, |
| // while, for, and switch statements are local to the if, while, for, or |
| // switch statement (including the controlled statement), and shall not be |
| // redeclared in a subsequent condition of that statement nor in the |
| // outermost block (or, for the if statement, any of the outermost blocks) |
| // of the controlled statement. |
| // |
| assert(S->getParent() && "No TUScope?"); |
| if (S->getParent()->getFlags() & Scope::ControlScope) |
| return S->getParent()->isDeclScope(Action::DeclPtrTy::make(D)); |
| } |
| return false; |
| } |
| |
| return D->getDeclContext()->getLookupContext()->Equals(Ctx); |
| } |
| |
| /// AddDecl - Link the decl to its shadowed decl chain. |
| void IdentifierResolver::AddDecl(NamedDecl *D) { |
| DeclarationName Name = D->getDeclName(); |
| if (IdentifierInfo *II = Name.getAsIdentifierInfo()) |
| II->setIsFromPCH(false); |
| |
| void *Ptr = Name.getFETokenInfo<void>(); |
| |
| if (!Ptr) { |
| Name.setFETokenInfo(D); |
| return; |
| } |
| |
| IdDeclInfo *IDI; |
| |
| if (isDeclPtr(Ptr)) { |
| Name.setFETokenInfo(NULL); |
| IDI = &(*IdDeclInfos)[Name]; |
| NamedDecl *PrevD = static_cast<NamedDecl*>(Ptr); |
| IDI->AddDecl(PrevD); |
| } else |
| IDI = toIdDeclInfo(Ptr); |
| |
| IDI->AddDecl(D); |
| } |
| |
| /// RemoveDecl - Unlink the decl from its shadowed decl chain. |
| /// The decl must already be part of the decl chain. |
| void IdentifierResolver::RemoveDecl(NamedDecl *D) { |
| assert(D && "null param passed"); |
| DeclarationName Name = D->getDeclName(); |
| if (IdentifierInfo *II = Name.getAsIdentifierInfo()) |
| II->setIsFromPCH(false); |
| |
| void *Ptr = Name.getFETokenInfo<void>(); |
| |
| assert(Ptr && "Didn't find this decl on its identifier's chain!"); |
| |
| if (isDeclPtr(Ptr)) { |
| assert(D == Ptr && "Didn't find this decl on its identifier's chain!"); |
| Name.setFETokenInfo(NULL); |
| return; |
| } |
| |
| return toIdDeclInfo(Ptr)->RemoveDecl(D); |
| } |
| |
| bool IdentifierResolver::ReplaceDecl(NamedDecl *Old, NamedDecl *New) { |
| assert(Old->getDeclName() == New->getDeclName() && |
| "Cannot replace a decl with another decl of a different name"); |
| |
| DeclarationName Name = Old->getDeclName(); |
| if (IdentifierInfo *II = Name.getAsIdentifierInfo()) |
| II->setIsFromPCH(false); |
| |
| void *Ptr = Name.getFETokenInfo<void>(); |
| |
| if (!Ptr) |
| return false; |
| |
| if (isDeclPtr(Ptr)) { |
| if (Ptr == Old) { |
| Name.setFETokenInfo(New); |
| return true; |
| } |
| return false; |
| } |
| |
| return toIdDeclInfo(Ptr)->ReplaceDecl(Old, New); |
| } |
| |
| /// begin - Returns an iterator for decls with name 'Name'. |
| IdentifierResolver::iterator |
| IdentifierResolver::begin(DeclarationName Name) { |
| void *Ptr = Name.getFETokenInfo<void>(); |
| if (!Ptr) return end(); |
| |
| if (isDeclPtr(Ptr)) |
| return iterator(static_cast<NamedDecl*>(Ptr)); |
| |
| IdDeclInfo *IDI = toIdDeclInfo(Ptr); |
| |
| IdDeclInfo::DeclsTy::iterator I = IDI->decls_end(); |
| if (I != IDI->decls_begin()) |
| return iterator(I-1); |
| // No decls found. |
| return end(); |
| } |
| |
| void IdentifierResolver::AddDeclToIdentifierChain(IdentifierInfo *II, |
| NamedDecl *D) { |
| II->setIsFromPCH(false); |
| void *Ptr = II->getFETokenInfo<void>(); |
| |
| if (!Ptr) { |
| II->setFETokenInfo(D); |
| return; |
| } |
| |
| IdDeclInfo *IDI; |
| |
| if (isDeclPtr(Ptr)) { |
| II->setFETokenInfo(NULL); |
| IDI = &(*IdDeclInfos)[II]; |
| NamedDecl *PrevD = static_cast<NamedDecl*>(Ptr); |
| IDI->AddDecl(PrevD); |
| } else |
| IDI = toIdDeclInfo(Ptr); |
| |
| IDI->AddDecl(D); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // IdDeclInfoMap Implementation |
| //===----------------------------------------------------------------------===// |
| |
| /// Returns the IdDeclInfo associated to the DeclarationName. |
| /// It creates a new IdDeclInfo if one was not created before for this id. |
| IdentifierResolver::IdDeclInfo & |
| IdentifierResolver::IdDeclInfoMap::operator[](DeclarationName Name) { |
| void *Ptr = Name.getFETokenInfo<void>(); |
| |
| if (Ptr) return *toIdDeclInfo(Ptr); |
| |
| if (CurIndex == POOL_SIZE) { |
| CurPool = new IdDeclInfoPool(CurPool); |
| CurIndex = 0; |
| } |
| IdDeclInfo *IDI = &CurPool->Pool[CurIndex]; |
| Name.setFETokenInfo(reinterpret_cast<void*>( |
| reinterpret_cast<uintptr_t>(IDI) | 0x1) |
| ); |
| ++CurIndex; |
| return *IDI; |
| } |