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