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e460a01af6
I talked to John about parsing patterns today, and because of the magnitude of name-lookup-dependent ambiguities between patterns and expressions, we agreed that at least for a first-pass implementation it makes sense to parse patterns as extensions of the expr grammar and charge name binding with distinguishing patterns from expressions. This gets us out of needing the concept of an "unresolved pattern", at least in the short term. Swift SVN r5808
793 lines
19 KiB
C++
793 lines
19 KiB
C++
//===--- ASTWalker.cpp - AST Traversal ------------------------------------===//
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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 Expr::walk and Stmt::walk.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/ASTWalker.h"
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#include "swift/AST/ASTVisitor.h"
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#include "swift/AST/PrettyStackTrace.h"
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using namespace swift;
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void ASTWalker::anchor() {}
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namespace {
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/// Traversal - This class implements a simple expression/statement
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/// recursive traverser which queries a user-provided walker class
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/// on every node in an AST.
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class Traversal : public ASTVisitor<Traversal, Expr*, Stmt*,
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/*Decl*/ void,
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Pattern *>
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{
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friend class ASTVisitor<Traversal, Expr*, Stmt*, void, Pattern*>;
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typedef ASTVisitor<Traversal, Expr*, Stmt*, void, Pattern*> inherited;
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ASTWalker &Walker;
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/// \brief RAII object that sets the parent of the walk context
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/// appropriately.
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class SetParentRAII {
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ASTWalker &Walker;
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decltype(ASTWalker::Parent) PriorParent;
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public:
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template<typename T>
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SetParentRAII(ASTWalker &walker, T *newParent)
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: Walker(walker), PriorParent(walker.Parent) {
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walker.Parent = newParent;
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}
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~SetParentRAII() {
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Walker.Parent = PriorParent;
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}
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};
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Expr *visit(Expr *E) {
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SetParentRAII SetParent(Walker, E);
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return inherited::visit(E);
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}
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Stmt *visit(Stmt *S) {
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SetParentRAII SetParent(Walker, S);
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return inherited::visit(S);
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}
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Pattern *visit(Pattern *P) {
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SetParentRAII SetParent(Walker, P);
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return inherited::visit(P);
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}
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Expr *visitErrorExpr(ErrorExpr *E) { return E; }
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Expr *visitLiteralExpr(LiteralExpr *E) { return E; }
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Expr *visitDeclRefExpr(DeclRefExpr *E) { return E; }
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Expr *visitSuperRefExpr(SuperRefExpr *E) { return E; }
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Expr *visitOtherConstructorDeclRefExpr(OtherConstructorDeclRefExpr *E) {
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return E;
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}
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Expr *visitUnresolvedConstructorExpr(UnresolvedConstructorExpr *E) {
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if (auto sub = doIt(E->getSubExpr())) {
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E->setSubExpr(sub);
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return E;
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}
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return nullptr;
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}
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Expr *visitOverloadedDeclRefExpr(OverloadedDeclRefExpr *E) { return E; }
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Expr *visitOverloadedMemberRefExpr(OverloadedMemberRefExpr *E) {
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if (auto base = doIt(E->getBase())) {
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E->setBase(base);
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return E;
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}
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return nullptr;
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}
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Expr *visitUnresolvedDeclRefExpr(UnresolvedDeclRefExpr *E) { return E; }
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Expr *visitUnresolvedMemberExpr(UnresolvedMemberExpr *E) { return E; }
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Expr *visitOpaqueValueExpr(OpaqueValueExpr *E) { return E; }
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Expr *visitZeroValueExpr(ZeroValueExpr *E) { return E; }
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Expr *visitInterpolatedStringLiteralExpr(InterpolatedStringLiteralExpr *E) {
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for (auto &Segment : E->getSegments()) {
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if (Expr *Seg = doIt(Segment))
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Segment = Seg;
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else
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return nullptr;
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}
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return E;
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}
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Expr *visitCollectionExpr(CollectionExpr *E) {
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if (Expr *Sub = doIt(E->getSubExpr())) {
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E->setSubExpr(Sub);
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return E;
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}
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return nullptr;
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}
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Expr *visitMemberRefExpr(MemberRefExpr *E) {
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if (Expr *Base = doIt(E->getBase())) {
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E->setBase(Base);
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return E;
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}
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return nullptr;
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}
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Expr *visitExistentialMemberRefExpr(ExistentialMemberRefExpr *E) {
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if (Expr *Base = doIt(E->getBase())) {
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E->setBase(Base);
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return E;
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}
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return nullptr;
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}
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Expr *visitArchetypeMemberRefExpr(ArchetypeMemberRefExpr *E) {
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if (Expr *Base = doIt(E->getBase())) {
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E->setBase(Base);
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return E;
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}
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return nullptr;
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}
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Expr *visitGenericMemberRefExpr(GenericMemberRefExpr *E) {
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if (Expr *Base = doIt(E->getBase())) {
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E->setBase(Base);
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return E;
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}
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return nullptr;
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}
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Expr *visitParenExpr(ParenExpr *E) {
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if (Expr *subExpr = doIt(E->getSubExpr())) {
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E->setSubExpr(subExpr);
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return E;
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}
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return nullptr;
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}
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Expr *visitTupleExpr(TupleExpr *E) {
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for (unsigned i = 0, e = E->getNumElements(); i != e; ++i)
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if (E->getElement(i)) {
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if (Expr *Elt = doIt(E->getElement(i)))
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E->setElement(i, Elt);
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else
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return nullptr;
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}
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return E;
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}
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Expr *visitSubscriptExpr(SubscriptExpr *E) {
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if (Expr *Base = doIt(E->getBase()))
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E->setBase(Base);
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else
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return nullptr;
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if (Expr *Index = doIt(E->getIndex()))
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E->setIndex(Index);
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else
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return nullptr;
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return E;
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}
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Expr *visitExistentialSubscriptExpr(ExistentialSubscriptExpr *E) {
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if (Expr *Base = doIt(E->getBase()))
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E->setBase(Base);
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else
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return nullptr;
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if (Expr *Index = doIt(E->getIndex()))
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E->setIndex(Index);
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else
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return nullptr;
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return E;
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}
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Expr *visitArchetypeSubscriptExpr(ArchetypeSubscriptExpr *E) {
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if (Expr *Base = doIt(E->getBase()))
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E->setBase(Base);
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else
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return nullptr;
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if (Expr *Index = doIt(E->getIndex()))
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E->setIndex(Index);
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else
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return nullptr;
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return E;
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}
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Expr *visitGenericSubscriptExpr(GenericSubscriptExpr *E) {
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if (Expr *Base = doIt(E->getBase()))
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E->setBase(Base);
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else
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return nullptr;
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if (Expr *Index = doIt(E->getIndex()))
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E->setIndex(Index);
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else
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return nullptr;
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return E;
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}
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Expr *visitUnresolvedDotExpr(UnresolvedDotExpr *E) {
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if (!E->getBase())
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return E;
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if (Expr *E2 = doIt(E->getBase())) {
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E->setBase(E2);
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return E;
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}
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return nullptr;
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}
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Expr *visitUnresolvedSpecializeExpr(UnresolvedSpecializeExpr *E) {
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if (!E->getSubExpr())
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return E;
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if (Expr *Sub = doIt(E->getSubExpr())) {
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E->setSubExpr(Sub);
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return E;
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}
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return nullptr;
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}
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Expr *visitTupleElementExpr(TupleElementExpr *E) {
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if (Expr *E2 = doIt(E->getBase())) {
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E->setBase(E2);
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return E;
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}
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return nullptr;
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}
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Expr *visitImplicitConversionExpr(ImplicitConversionExpr *E) {
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if (Expr *E2 = doIt(E->getSubExpr())) {
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E->setSubExpr(E2);
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return E;
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}
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return nullptr;
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}
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Expr *visitAddressOfExpr(AddressOfExpr *E) {
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if (Expr *E2 = doIt(E->getSubExpr())) {
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E->setSubExpr(E2);
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return E;
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}
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return nullptr;
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}
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Expr *visitSequenceExpr(SequenceExpr *E) {
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for (unsigned i = 0, e = E->getNumElements(); i != e; ++i)
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if (Expr *Elt = doIt(E->getElement(i)))
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E->setElement(i, Elt);
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else
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return nullptr;
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return E;
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}
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Expr *visitNewArrayExpr(NewArrayExpr *E) {
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for (auto &bound : E->getBounds()) {
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// Ignore empty bounds.
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if (!bound.Value) continue;
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Expr *newValue = doIt(bound.Value);
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if (!newValue) return nullptr;
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bound.Value = newValue;
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}
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return E;
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}
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Expr *visitMetatypeExpr(MetatypeExpr *E) {
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if (Expr *base = E->getBase()) {
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if ((base = doIt(base)))
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E->setBase(base);
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else
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return nullptr;
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}
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return E;
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}
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Expr *visitFuncExpr(FuncExpr *E) {
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if (!E->getBody())
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return E;
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if (BraceStmt *S = cast_or_null<BraceStmt>(doIt(E->getBody()))) {
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E->setBody(S);
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return E;
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}
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return nullptr;
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}
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Expr *visitPipeClosureExpr(PipeClosureExpr *expr) {
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// Handle single-expression closures.
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if (expr->hasSingleExpressionBody()) {
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if (Expr *body = doIt(expr->getSingleExpressionBody())) {
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expr->setSingleExpressionBody(body);
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return expr;
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}
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return nullptr;
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}
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// Handle other closures.
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if (BraceStmt *body = cast_or_null<BraceStmt>(doIt(expr->getBody()))) {
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expr->setBody(body, false);
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return expr;
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}
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return nullptr;
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}
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Expr *visitImplicitClosureExpr(ImplicitClosureExpr *E) {
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if (Expr *E2 = doIt(E->getBody())) {
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E->setBody(E2);
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return E;
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}
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return nullptr;
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}
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Expr *visitModuleExpr(ModuleExpr *E) { return E; }
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Expr *visitApplyExpr(ApplyExpr *E) {
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if (E->getFn()) {
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Expr *E2 = doIt(E->getFn());
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if (E2 == nullptr) return nullptr;
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E->setFn(E2);
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}
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if (E->getArg()) {
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Expr *E2 = doIt(E->getArg());
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if (E2 == nullptr) return nullptr;
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E->setArg(E2);
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}
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return E;
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}
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Expr *visitDotSyntaxBaseIgnoredExpr(DotSyntaxBaseIgnoredExpr *E) {
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Expr *E2 = doIt(E->getLHS());
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if (E2 == nullptr) return nullptr;
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E->setLHS(E2);
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E2 = doIt(E->getRHS());
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if (E2 == nullptr) return nullptr;
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E->setRHS(E2);
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return E;
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}
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Expr *visitExplicitCastExpr(ExplicitCastExpr *E) {
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if (Expr *Sub = E->getSubExpr()) {
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Sub = doIt(Sub);
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if (!Sub) return nullptr;
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E->setSubExpr(Sub);
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}
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return E;
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}
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Expr *visitRebindThisInConstructorExpr(RebindThisInConstructorExpr *E) {
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Expr *Sub = doIt(E->getSubExpr());
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if (!Sub) return nullptr;
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E->setSubExpr(Sub);
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return E;
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}
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Expr *visitAssignExpr(AssignExpr *AE) {
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if (Expr *Dest = AE->getDest()) {
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if (!(Dest = doIt(Dest)))
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return nullptr;
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AE->setDest(Dest);
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}
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if (Expr *Src = AE->getSrc()) {
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if (!(Src = doIt(AE->getSrc())))
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return nullptr;
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AE->setSrc(Src);
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}
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return AE;
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}
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Expr *visitIfExpr(IfExpr *E) {
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if (Expr *Cond = E->getCondExpr()) {
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Cond = doIt(Cond);
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if (!Cond) return nullptr;
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E->setCondExpr(Cond);
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}
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Expr *Then = doIt(E->getThenExpr());
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if (!Then) return nullptr;
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E->setThenExpr(Then);
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if (Expr *Else = E->getElseExpr()) {
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Else = doIt(Else);
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if (!Else) return nullptr;
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E->setElseExpr(Else);
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}
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return E;
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}
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Expr *visitDefaultValueExpr(DefaultValueExpr *E) {
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Expr *sub = doIt(E->getSubExpr());
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if (!sub) return nullptr;
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E->setSubExpr(sub);
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return E;
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}
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Stmt *visitBreakStmt(BreakStmt *BS) {
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return BS;
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}
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Stmt *visitContinueStmt(ContinueStmt *CS) {
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return CS;
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}
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Stmt *visitFallthroughStmt(FallthroughStmt *CS) {
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return CS;
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}
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Stmt *visitBraceStmt(BraceStmt *BS) {
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for (auto &Elem : BS->getElements()) {
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if (Expr *SubExpr = Elem.dyn_cast<Expr*>()) {
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if (Expr *E2 = doIt(SubExpr))
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Elem = E2;
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else
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return nullptr;
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continue;
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}
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if (Stmt *S = Elem.dyn_cast<Stmt*>()) {
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if (Stmt *S2 = doIt(S))
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Elem = S2;
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else
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return nullptr;
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continue;
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}
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if (doIt(Elem.get<Decl*>()))
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return nullptr;
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}
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return BS;
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}
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Stmt *visitReturnStmt(ReturnStmt *RS) {
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if (!RS->hasResult())
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return RS;
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if (Expr *E = doIt(RS->getResult()))
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RS->setResult(E);
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else
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return nullptr;
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return RS;
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}
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Stmt *visitIfStmt(IfStmt *IS) {
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if (Expr *E2 = doIt(IS->getCond()))
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IS->setCond(E2);
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else
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return nullptr;
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if (Stmt *S2 = doIt(IS->getThenStmt()))
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IS->setThenStmt(S2);
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else
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return nullptr;
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if (IS->getElseStmt()) {
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if (Stmt *S2 = doIt(IS->getElseStmt()))
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IS->setElseStmt(S2);
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else
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return nullptr;
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}
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return IS;
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}
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Stmt *visitWhileStmt(WhileStmt *WS) {
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if (Expr *E2 = doIt(WS->getCond()))
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WS->setCond(E2);
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else
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return nullptr;
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if (Stmt *S2 = doIt(WS->getBody()))
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WS->setBody(S2);
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else
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return nullptr;
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return WS;
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}
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Stmt *visitDoWhileStmt(DoWhileStmt *DWS) {
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if (Stmt *S2 = doIt(DWS->getBody()))
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DWS->setBody(S2);
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else
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return nullptr;
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if (Expr *E2 = doIt(DWS->getCond()))
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DWS->setCond(E2);
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else
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return nullptr;
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return DWS;
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}
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Stmt *visitForStmt(ForStmt *FS) {
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// Visit any var decls in the initializer.
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for (auto D : FS->getInitializerVarDecls())
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if (doIt(D))
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return nullptr;
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if (FS->getInitializer()) {
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if (Expr *E = doIt(FS->getInitializer()))
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FS->setInitializer(E);
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else
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return nullptr;
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}
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if (FS->getCond().isNonNull()) {
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if (Expr *E2 = doIt(FS->getCond().get()))
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FS->setCond(E2);
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else
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return nullptr;
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}
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if (FS->getIncrement()) {
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if (Expr *E = doIt(FS->getIncrement()))
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FS->setIncrement(E);
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else
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return nullptr;
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}
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if (Stmt *S = doIt(FS->getBody()))
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FS->setBody(S);
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else
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return nullptr;
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return FS;
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}
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Stmt *visitForEachStmt(ForEachStmt *S) {
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if (Expr *Container = S->getContainer()) {
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if ((Container = doIt(Container)))
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S->setContainer(Container);
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else
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return nullptr;
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}
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if (Stmt *Body = S->getBody()) {
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if ((Body = doIt(Body)))
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S->setBody(cast<BraceStmt>(Body));
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else
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return nullptr;
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}
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return S;
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}
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Stmt *visitSwitchStmt(SwitchStmt *S) {
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if (Expr *newSubject = doIt(S->getSubjectExpr()))
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S->setSubjectExpr(newSubject);
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else
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return nullptr;
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for (CaseStmt *aCase : S->getCases()) {
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|
if (Stmt *aStmt = doIt(aCase)) {
|
|
assert(aCase == aStmt && "switch case remap not supported");
|
|
} else
|
|
return nullptr;
|
|
}
|
|
|
|
return S;
|
|
}
|
|
|
|
Stmt *visitCaseStmt(CaseStmt *S) {
|
|
for (CaseLabel *label : S->getCaseLabels()) {
|
|
for (Pattern *&pattern : label->getPatterns()) {
|
|
if (Pattern *newPattern = doIt(pattern))
|
|
pattern = newPattern;
|
|
else
|
|
return nullptr;
|
|
}
|
|
if (label->getGuardExpr()) {
|
|
if (Expr *newGuard = doIt(label->getGuardExpr()))
|
|
label->setGuardExpr(newGuard);
|
|
else
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
if (Stmt *newBody = doIt(S->getBody()))
|
|
S->setBody(newBody);
|
|
else
|
|
return nullptr;
|
|
|
|
return S;
|
|
}
|
|
|
|
Pattern *visitParenPattern(ParenPattern *P) {
|
|
if (Pattern *newSub = doIt(P->getSubPattern()))
|
|
P->setSubPattern(newSub);
|
|
else
|
|
return nullptr;
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitTuplePattern(TuplePattern *P) {
|
|
for (auto &field : P->getFields()) {
|
|
if (Pattern *newField = doIt(field.getPattern()))
|
|
field.setPattern(newField);
|
|
else
|
|
return nullptr;
|
|
}
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitNamedPattern(NamedPattern *P) {
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitAnyPattern(AnyPattern *P) {
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitTypedPattern(TypedPattern *P) {
|
|
if (Pattern *newSub = doIt(P->getSubPattern()))
|
|
P->setSubPattern(newSub);
|
|
else
|
|
return nullptr;
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitIsaPattern(IsaPattern *P) {
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitNominalTypePattern(NominalTypePattern *P) {
|
|
if (Pattern *newSub = doIt(P->getSubPattern()))
|
|
P->setSubPattern(newSub);
|
|
else
|
|
return nullptr;
|
|
return P;
|
|
}
|
|
|
|
Pattern *visitExprPattern(ExprPattern *P) {
|
|
if (Expr *newSub = doIt(P->getSubExpr()))
|
|
P->setSubExpr(newSub);
|
|
else
|
|
return nullptr;
|
|
return P;
|
|
}
|
|
|
|
public:
|
|
Traversal(ASTWalker &walker) : Walker(walker) {}
|
|
|
|
Expr *doIt(Expr *E) {
|
|
// Do the pre-order visitation. If it returns false, we just
|
|
// skip entering subnodes of this tree.
|
|
auto Pre = Walker.walkToExprPre(E);
|
|
if (!Pre.first || !Pre.second)
|
|
return Pre.second;
|
|
|
|
// Otherwise, visit the children.
|
|
E = visit(E);
|
|
|
|
// If we didn't bail out, do post-order visitation.
|
|
if (E) E = Walker.walkToExprPost(E);
|
|
|
|
return E;
|
|
}
|
|
|
|
Stmt *doIt(Stmt *S) {
|
|
// Do the pre-order visitation. If it returns false, we just
|
|
// skip entering subnodes of this tree.
|
|
auto Pre = Walker.walkToStmtPre(S);
|
|
if (!Pre.first || !Pre.second)
|
|
return Pre.second;
|
|
|
|
// Otherwise, visit the children.
|
|
S = visit(S);
|
|
|
|
// If we didn't bail out, do post-order visitation.
|
|
if (S) S = Walker.walkToStmtPost(S);
|
|
|
|
return S;
|
|
}
|
|
|
|
/// Returns true on failure.
|
|
bool doIt(Decl *D) {
|
|
// Do the pre-order visitation. If it returns false, we just
|
|
// skip entering subnodes of this tree.
|
|
if (!Walker.walkToDeclPre(D))
|
|
return false;
|
|
|
|
if (PatternBindingDecl *PBD = dyn_cast<PatternBindingDecl>(D)) {
|
|
if (Expr *Init = PBD->getInit()) {
|
|
#ifndef NDEBUG
|
|
PrettyStackTraceDecl debugStack("walking into initializer for", PBD);
|
|
#endif
|
|
if (Expr *E2 = doIt(Init))
|
|
PBD->setInit(E2);
|
|
else
|
|
return true;
|
|
}
|
|
} else if (FuncDecl *FD = dyn_cast<FuncDecl>(D)) {
|
|
FuncExpr *Body = FD->getBody();
|
|
#ifndef NDEBUG
|
|
PrettyStackTraceDecl debugStack("walking into body of", FD);
|
|
#endif
|
|
if (FuncExpr *E2 = cast_or_null<FuncExpr>(doIt(Body)))
|
|
FD->setBody(E2);
|
|
else
|
|
return true;
|
|
} else if (ExtensionDecl *ED = dyn_cast<ExtensionDecl>(D)) {
|
|
for (Decl *M : ED->getMembers()) {
|
|
if (doIt(M))
|
|
return true;
|
|
}
|
|
} else if (OneOfDecl *OOD = dyn_cast<OneOfDecl>(D)) {
|
|
for (Decl *Member : OOD->getMembers())
|
|
if (doIt(Member))
|
|
return true;
|
|
} else if (StructDecl *SD = dyn_cast<StructDecl>(D)) {
|
|
for (Decl *Member : SD->getMembers())
|
|
if (doIt(Member))
|
|
return true;
|
|
} else if (ClassDecl *CD = dyn_cast<ClassDecl>(D)) {
|
|
for (Decl *Member : CD->getMembers())
|
|
if (doIt(Member))
|
|
return true;
|
|
} else if (TopLevelCodeDecl *TLCD = dyn_cast<TopLevelCodeDecl>(D)) {
|
|
if (BraceStmt *S = cast_or_null<BraceStmt>(doIt(TLCD->getBody())))
|
|
TLCD->setBody(S);
|
|
} else if (ConstructorDecl *CD = dyn_cast<ConstructorDecl>(D)) {
|
|
Stmt *S = CD->getBody();
|
|
if (S) {
|
|
S = doIt(S);
|
|
CD->setBody(cast<BraceStmt>(S));
|
|
}
|
|
} else if (DestructorDecl *DD = dyn_cast<DestructorDecl>(D)) {
|
|
Stmt *S = DD->getBody();
|
|
S = doIt(S);
|
|
DD->setBody(cast<BraceStmt>(S));
|
|
}
|
|
|
|
return !Walker.walkToDeclPost(D);
|
|
}
|
|
|
|
Pattern *doIt(Pattern *P) {
|
|
// Do the pre-order visitation. If it returns false, we just
|
|
// skip entering subnodes of this tree.
|
|
auto Pre = Walker.walkToPatternPre(P);
|
|
if (!Pre.first || !Pre.second)
|
|
return Pre.second;
|
|
|
|
// Otherwise, visit the children.
|
|
P = visit(P);
|
|
|
|
// If we didn't bail out, do post-order visitation.
|
|
if (P) P = Walker.walkToPatternPost(P);
|
|
|
|
return P;
|
|
}
|
|
};
|
|
|
|
} // end anonymous namespace.
|
|
|
|
Expr *Expr::walk(ASTWalker &walker) {
|
|
return Traversal(walker).doIt(this);
|
|
}
|
|
|
|
Stmt *Stmt::walk(ASTWalker &walker) {
|
|
return Traversal(walker).doIt(this);
|
|
}
|
|
|
|
bool Decl::walk(ASTWalker &walker) {
|
|
return Traversal(walker).doIt(this);
|
|
}
|