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efffe5c065
Currently not only we insert names in non-resolvable scopes, but every overloaded name gets stored only once (the last one wins). Everything just happens to work, because we never do name lookup in these scopes. I also added a ScopeKind to every Scope (instead of just adding the bit -- isResolvableScope), because this provides a better debugging experience, and centralizes knowledge about what scope kind is resolvable in the function isResolvableScope(ScopeKind). Swift SVN r5822
117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
//===--- Scope.cpp - Scope 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 semantic analysis for Swift declarations.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/Attr.h"
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#include "Scope.h"
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#include "Parser.h"
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#include "llvm/ADT/Twine.h"
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using namespace swift;
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//===----------------------------------------------------------------------===//
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// Scope Implementation
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//===----------------------------------------------------------------------===//
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static bool isResolvableScope(ScopeKind SK) {
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switch (SK) {
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case ScopeKind::Extension:
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case ScopeKind::OneofBody:
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case ScopeKind::StructBody:
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case ScopeKind::ClassBody:
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case ScopeKind::ProtocolBody:
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case ScopeKind::TopLevel:
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return false;
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case ScopeKind::FunctionBody:
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case ScopeKind::Generics:
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case ScopeKind::ConstructorBody:
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case ScopeKind::DestructorBody:
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case ScopeKind::Brace:
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case ScopeKind::ForVars:
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case ScopeKind::ForeachVars:
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case ScopeKind::ClosureParams:
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return true;
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}
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}
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Scope::Scope(Parser *P, ScopeKind SC):
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SI(P->ScopeInfo),
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ValueHTScope(SI.ValueScopeHT),
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PrevScope(SI.CurScope),
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PrevResolvableDepth(SI.ResolvableDepth),
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Kind(SC) {
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if (SI.CurScope)
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Depth = SI.CurScope->Depth+1;
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else
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Depth = 0;
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SI.CurScope = this;
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if (!isResolvableScope(SC))
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SI.ResolvableDepth = Depth + 1;
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}
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bool Scope::isResolvable() const {
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return isResolvableScope(Kind);
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}
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//===----------------------------------------------------------------------===//
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// ScopeInfo Implementation
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//===----------------------------------------------------------------------===//
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/// checkValidOverload - Check whether it is ok for D1 and D2 to be declared at
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/// the same scope. This check is a transitive relationship, so if "D1 is a
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/// valid overload of D2" and "D2 is a valid overload of D3" then we know that
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/// D1/D3 are valid overloads and we don't have to check all permutations.
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static bool checkValidOverload(const ValueDecl *D1, const ValueDecl *D2,
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Parser &P) {
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// Currently, there is no restriction on overloading.
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return false;
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}
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/// addToScope - Register the specified decl as being in the current lexical
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/// scope.
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void ScopeInfo::addToScope(ValueDecl *D) {
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if (!CurScope->isResolvable())
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return;
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assert(CurScope->getDepth() >= ResolvableDepth &&
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"inserting names into a non-resolvable scope");
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// If we have a shadowed variable definition, check to see if we have a
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// redefinition: two definitions in the same scope with the same name.
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ValueScopeHTTy::iterator EntryI = ValueScopeHT.begin(D->getName());
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// A redefinition is a hit in the scoped table at the same depth.
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if (EntryI != ValueScopeHT.end() && EntryI->first == CurScope->getDepth()) {
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ValueDecl *PrevDecl = EntryI->second;
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// If this is in a resolvable scope, diagnose redefinitions. Later
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// phases will handle scopes like module-scope, etc.
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if (CurScope->getDepth() >= ResolvableDepth)
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return TheParser.diagnoseRedefinition(PrevDecl, D);
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// If this is at top-level scope, validate that the members of the overload
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// set all agree.
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// Check to see if D and PrevDecl are valid in the same overload set.
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if (checkValidOverload(D, PrevDecl, TheParser))
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return;
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// Note: we don't check whether all of the elements of the overload set have
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// different argument types. This is checked later.
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}
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ValueScopeHT.insert(D->getName(), std::make_pair(CurScope->getDepth(), D));
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}
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