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87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
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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 - 2023 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 https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "AsyncRefactoring.h"
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using namespace swift;
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using namespace swift::refactoring::asyncrefactorings;
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const ScopedDeclCollector::RefDeclsTy *
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ScopedDeclCollector::getReferencedDecls(Stmt *Scope) const {
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auto Res = ReferencedDecls.find(Scope);
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if (Res == ReferencedDecls.end())
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return nullptr;
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return &Res->second;
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}
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bool ScopedDeclCollector::walkToDeclPre(Decl *D, CharSourceRange Range) {
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if (ScopeStack.empty() || D->isImplicit())
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return true;
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ScopeStack.back().DeclaredDecls.insert(D);
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if (isa<DeclContext>(D))
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(*ScopeStack.back().ReferencedDecls)[D] += 1;
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return true;
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}
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bool ScopedDeclCollector::walkToExprPre(Expr *E) {
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if (ScopeStack.empty())
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return true;
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if (!E->isImplicit()) {
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if (auto *DRE = dyn_cast<DeclRefExpr>(E)) {
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if (auto *D = DRE->getDecl()) {
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// If we have a reference that isn't declared in the same scope,
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// increment the number of references to that decl.
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if (!D->isImplicit() && !ScopeStack.back().DeclaredDecls.count(D)) {
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(*ScopeStack.back().ReferencedDecls)[D] += 1;
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// Also add the async alternative of a function to prevent
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// collisions if a call is replaced with the alternative.
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if (auto *AFD = dyn_cast<AbstractFunctionDecl>(D)) {
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if (auto *Alternative = AFD->getAsyncAlternative())
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(*ScopeStack.back().ReferencedDecls)[Alternative] += 1;
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}
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}
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}
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}
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}
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return true;
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}
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bool ScopedDeclCollector::walkToStmtPre(Stmt *S) {
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// Purposely check \c BraceStmt here rather than \c startsNewScope.
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// References in the condition should be applied to the previous scope, not
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// the scope of that statement.
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if (isa<BraceStmt>(S))
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ScopeStack.emplace_back(&ReferencedDecls[S]);
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return true;
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}
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bool ScopedDeclCollector::walkToStmtPost(Stmt *S) {
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if (isa<BraceStmt>(S)) {
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size_t NumScopes = ScopeStack.size();
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if (NumScopes >= 2) {
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// Add any referenced decls to the parent scope that weren't declared
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// there.
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auto &ParentStack = ScopeStack[NumScopes - 2];
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for (auto DeclAndNumRefs : *ScopeStack.back().ReferencedDecls) {
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auto *D = DeclAndNumRefs.first;
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if (!ParentStack.DeclaredDecls.count(D))
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(*ParentStack.ReferencedDecls)[D] += DeclAndNumRefs.second;
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}
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}
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ScopeStack.pop_back();
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}
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return true;
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}
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