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211 lines
8.4 KiB
C++
211 lines
8.4 KiB
C++
//===--- Module.cpp - Swift Language Module Implementation ----------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Module class and subclasses.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/Module.h"
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#include "swift/AST/AST.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/TinyPtrVector.h"
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using namespace swift;
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//===----------------------------------------------------------------------===//
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// Builtin Module Name lookup
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//===----------------------------------------------------------------------===//
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namespace {
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/// BuiltinModuleCache - This is the type of the cache for the BuiltinModule.
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/// This is lazily created on its first use an hangs off
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/// Module::LookupCachePimpl.
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class BuiltinModuleCache {
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/// The cache of identifiers we've already looked up. We use a
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/// single hashtable for both types and values as a minor
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/// optimization; this prevents us from having both a builtin type
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/// and a builtin value with the same name, but that's okay.
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llvm::DenseMap<Identifier, NamedDecl*> Cache;
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public:
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TypeAliasDecl *lookupType(Identifier Name, NLKind LookupKind,
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BuiltinModule &M);
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void lookupValue(Identifier Name, NLKind LookupKind, BuiltinModule &M,
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SmallVectorImpl<ValueDecl*> &Result);
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};
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} // end anonymous namespace.
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static BuiltinModuleCache &getBuiltinCachePimpl(void *&Ptr) {
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// FIXME: This leaks. Sticking this into ASTContext isn't enough because then
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// the DenseMap will leak.
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if (Ptr == 0)
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Ptr = new BuiltinModuleCache();
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return *(BuiltinModuleCache*)Ptr;
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}
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TypeAliasDecl *BuiltinModuleCache::lookupType(Identifier Name,
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NLKind LookupKind,
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BuiltinModule &M) {
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// Only qualified lookup ever finds anything in the builtin module.
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if (LookupKind != NLKind::QualifiedLookup) return nullptr;
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NamedDecl *&Entry = Cache[Name];
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if (Entry == 0)
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if (Type Ty = getBuiltinType(M.Ctx, Name))
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Entry = new (M.Ctx) TypeAliasDecl(SourceLoc(), Name, Ty, DeclAttributes(),
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M.Ctx.TheBuiltinModule);
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return dyn_cast_or_null<TypeAliasDecl>(Entry);
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}
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void BuiltinModuleCache::lookupValue(Identifier Name, NLKind LookupKind,
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BuiltinModule &M,
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SmallVectorImpl<ValueDecl*> &Result) {
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// Only qualified lookup ever finds anything in the builtin module.
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if (LookupKind != NLKind::QualifiedLookup) return;
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NamedDecl *&Entry = Cache[Name];
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if (Entry == 0)
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Entry = getBuiltinValue(M.Ctx, Name);
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if (ValueDecl *VD = dyn_cast_or_null<ValueDecl>(Entry))
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Result.push_back(VD);
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}
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//===----------------------------------------------------------------------===//
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// Normal Module Name Lookup
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//===----------------------------------------------------------------------===//
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namespace {
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/// TUModuleCache - This is the type of the cache for the TranslationUnit.
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/// This is lazily created on its first use an hangs off
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/// Module::LookupCachePimpl.
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class TUModuleCache {
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llvm::DenseMap<Identifier, llvm::TinyPtrVector<ValueDecl*>> TopLevelValues;
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llvm::DenseMap<Identifier, TypeAliasDecl *> TopLevelTypes;
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public:
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typedef Module::AccessPathTy AccessPathTy;
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TypeAliasDecl *lookupType(AccessPathTy AccessPath, Identifier Name,
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NLKind LookupKind, TranslationUnit &TU);
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void lookupValue(AccessPathTy AccessPath, Identifier Name,
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NLKind LookupKind, TranslationUnit &TU,
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SmallVectorImpl<ValueDecl*> &Result);
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};
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} // end anonymous namespace.
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static TUModuleCache &getTUCachePimpl(void *&Ptr) {
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// FIXME: This leaks. Sticking this into ASTContext isn't enough because then
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// the DenseMap will leak.
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if (Ptr == 0)
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Ptr = new TUModuleCache();
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return *(TUModuleCache*)Ptr;
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}
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TypeAliasDecl *TUModuleCache::lookupType(AccessPathTy AccessPath,
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Identifier Name, NLKind LookupKind,
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TranslationUnit &TU) {
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assert(AccessPath.size() <= 1 && "Don't handle this yet");
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// If this import is specific to some named type or decl ("import swift.int")
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// then filter out any lookups that don't match.
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if (AccessPath.size() == 1 && AccessPath[0].first != Name)
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return 0;
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if (TopLevelTypes.empty()) {
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for (auto Elt : TU.Body->getElements())
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if (Decl *D = Elt.dyn_cast<Decl*>())
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if (TypeAliasDecl *TAD = dyn_cast<TypeAliasDecl>(D))
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if (!TAD->Name.empty())
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TopLevelTypes[TAD->Name] = TAD;
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}
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auto I = TopLevelTypes.find(Name);
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return I != TopLevelTypes.end() ? I->second : 0;
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}
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void TUModuleCache::lookupValue(AccessPathTy AccessPath, Identifier Name,
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NLKind LookupKind, TranslationUnit &TU,
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SmallVectorImpl<ValueDecl*> &Result) {
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// TODO: ImportDecls cannot specified namespaces or individual entities
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// yet, so everything is just a lookup at the top-level.
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assert(AccessPath.size() <= 1 && "Don't handle this yet");
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// If this import is specific to some named type or decl ("import swift.int")
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// then filter out any lookups that don't match.
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if (AccessPath.size() == 1 && AccessPath[0].first != Name)
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return;
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// If we haven't built a map of the top-level values, do so now.
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if (TopLevelValues.empty()) {
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for (auto Elt : TU.Body->getElements())
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if (Decl *D = Elt.dyn_cast<Decl*>())
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if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
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if (!VD->Name.empty())
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TopLevelValues[VD->Name].push_back(VD);
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}
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auto I = TopLevelValues.find(Name);
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if (I == TopLevelValues.end()) return;
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Result.reserve(I->second.size());
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for (ValueDecl *Elt : I->second) {
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// Dot Lookup ignores values with non-function types.
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if (LookupKind == NLKind::DotLookup && !Elt->Ty->is<FunctionType>())
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continue;
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Result.push_back(Elt);
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}
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}
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//===----------------------------------------------------------------------===//
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// Module Implementation
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//===----------------------------------------------------------------------===//
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/// lookupType - Look up a type at top-level scope (but with the specified
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/// access path, which may come from an import decl) within the current
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/// module. This does a simple local lookup, not recursively looking through
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/// imports.
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TypeAliasDecl *Module::lookupType(AccessPathTy AccessPath, Identifier Name,
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NLKind LookupKind) {
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if (BuiltinModule *BM = dyn_cast<BuiltinModule>(this)) {
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assert(AccessPath.empty() && "builtin module's access path always empty!");
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return getBuiltinCachePimpl(LookupCachePimpl)
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.lookupType(Name, LookupKind, *BM);
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}
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// Otherwise must be TranslationUnit. Someday we should generalize this to
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// allow modules with multiple translation units.
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return getTUCachePimpl(LookupCachePimpl)
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.lookupType(AccessPath, Name, LookupKind, *cast<TranslationUnit>(this));
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}
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/// lookupValue - Look up a (possibly overloaded) value set at top-level scope
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/// (but with the specified access path, which may come from an import decl)
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/// within the current module. This does a simple local lookup, not
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/// recursively looking through imports.
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void Module::lookupValue(AccessPathTy AccessPath, Identifier Name,
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NLKind LookupKind,
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SmallVectorImpl<ValueDecl*> &Result) {
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if (BuiltinModule *BM = dyn_cast<BuiltinModule>(this)) {
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assert(AccessPath.empty() && "builtin module's access path always empty!");
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return getBuiltinCachePimpl(LookupCachePimpl)
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.lookupValue(Name, LookupKind, *BM, Result);
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}
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// Otherwise must be TranslationUnit. Someday we should generalize this to
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// allow modules with multiple translation units.
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return getTUCachePimpl(LookupCachePimpl)
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.lookupValue(AccessPath, Name, LookupKind, *cast<TranslationUnit>(this),
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Result);
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}
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