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[CodeCompletion] Delete SanitizeExpr
rdar://111756748
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‎lib/Sema/TypeCheckCodeCompletion.cpp‎

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Original file line numberDiff line numberDiff line change
@@ -102,201 +102,6 @@ static Expr *extractKeyPathFromCurryThunkCall(Expr *E) {
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return cast<CallExpr>(E)->getArgs()->getUnlabeledUnaryExpr();
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}
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namespace {
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/// AST walker that "sanitizes" an expression for re-typechecking during
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/// code completion.
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///
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/// FIXME: Remove this.
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class SanitizeExpr : public ASTWalker {
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ASTContext &C;
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llvm::SmallDenseMap<OpaqueValueExpr *, Expr *, 4> OpenExistentials;
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public:
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SanitizeExpr(ASTContext &C)
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: C(C) { }
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MacroWalking getMacroWalkingBehavior() const override {
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return MacroWalking::Arguments;
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}
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PreWalkResult<ArgumentList *>
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walkToArgumentListPre(ArgumentList *argList) override {
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// Return the argument list to the state prior to being rewritten. This will
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// strip default arguments and expand variadic args.
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return Action::Continue(argList->getOriginalArgs());
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}
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PreWalkResult<Expr *> walkToExprPre(Expr *expr) override {
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while (true) {
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// OpenExistentialExpr contains OpaqueValueExpr in its sub expression.
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if (auto OOE = dyn_cast<OpenExistentialExpr>(expr)) {
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auto archetypeVal = OOE->getOpaqueValue();
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auto base = OOE->getExistentialValue();
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bool inserted = OpenExistentials.insert({archetypeVal, base}).second;
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assert(inserted && "OpaqueValue appears multiple times?");
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(void)inserted;
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SWIFT_DEFER { OpenExistentials.erase(archetypeVal); };
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// Walk to and return the base expression to erase any existentials
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// within it.
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return Action::SkipChildren(OOE->getSubExpr()->walk(*this));
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}
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// Hacky, this behaves just like an OpenedExistential in that it changes
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// the expr tree.
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if (auto ISLE = dyn_cast<InterpolatedStringLiteralExpr>(expr)) {
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if (auto subExpr = ISLE->getAppendingExpr()->getSubExpr()) {
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if (auto opaqueValue = dyn_cast<OpaqueValueExpr>(subExpr)) {
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ISLE->getAppendingExpr()->setSubExpr(nullptr);
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}
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}
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}
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// Substitute OpaqueValue with its representing existential.
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if (auto OVE = dyn_cast<OpaqueValueExpr>(expr)) {
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auto value = OpenExistentials.find(OVE);
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if (value != OpenExistentials.end()) {
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expr = value->second;
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continue;
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} else {
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assert(OVE->isPlaceholder() &&
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"Didn't see this OVE in a containing OpenExistentialExpr?");
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}
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}
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// Skip any implicit conversions applied to this expression.
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if (auto ICE = dyn_cast<ImplicitConversionExpr>(expr)) {
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expr = ICE->getSubExpr();
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continue;
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}
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// MakeTemporarilyEscapableExpr is typechecked expression.
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if (auto MTEE = dyn_cast<MakeTemporarilyEscapableExpr>(expr)) {
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expr = MTEE->getOriginalExpr();
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continue;
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}
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// Extract keypath from '{ `$kp$` in { $0[keyPath: $kp$] } }(keypath)'
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if (isKeyPathCurriedThunkCallExpr(expr)) {
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expr = extractKeyPathFromCurryThunkCall(expr);
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continue;
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}
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if (auto ACE = dyn_cast<AutoClosureExpr>(expr)) {
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// Restore '@autoclosure'd value.
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// This is only valid if the closure doesn't have parameters.
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if (ACE->getParameters()->size() == 0) {
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expr = ACE->getSingleExpressionBody();
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continue;
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}
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// Restore autoclosure'd function reference.
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if (auto *unwrapped = ACE->getUnwrappedCurryThunkExpr()) {
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expr = unwrapped;
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continue;
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}
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llvm_unreachable("other AutoClosureExpr must be handled specially");
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}
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// Remove any semantic expression injected by typechecking.
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if (auto EPE = dyn_cast<EditorPlaceholderExpr>(expr)) {
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EPE->setSemanticExpr(nullptr);
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}
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// If this is a closure, only walk into its children if they
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// are type-checked in the context of the enclosing expression.
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if (auto closure = dyn_cast<ClosureExpr>(expr)) {
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for (auto &Param : *closure->getParameters()) {
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Param->setSpecifier(swift::ParamSpecifier::Default);
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}
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}
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// Now, we're ready to walk into sub expressions.
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return Action::Continue(expr);
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}
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}
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PostWalkResult<Expr *> walkToExprPost(Expr *expr) override {
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assert(!isa<ImplicitConversionExpr>(expr) &&
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"ImplicitConversionExpr should be eliminated in walkToExprPre");
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auto buildMemberRef = [&](Type memberType, Expr *base, SourceLoc dotLoc,
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ConcreteDeclRef member, DeclNameLoc memberLoc,
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bool implicit) -> Expr * {
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auto *memberRef = new (C)
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MemberRefExpr(base, dotLoc, member, memberLoc, implicit);
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if (memberType) {
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memberRef->setType(memberType);
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return memberRef;
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}
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return memberRef;
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};
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// A DotSyntaxCallExpr is a member reference that has already been
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// type-checked down to a call; turn it back into an overloaded
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// member reference expression.
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if (auto dotCall = dyn_cast<DotSyntaxCallExpr>(expr)) {
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DeclNameLoc memberLoc;
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auto memberAndFunctionRef = findReferencedDecl(dotCall->getFn(),
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memberLoc);
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if (memberAndFunctionRef.first) {
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assert(!isa<ImplicitConversionExpr>(dotCall->getBase()));
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auto *ref = buildMemberRef(dotCall->getType(),
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dotCall->getBase(),
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dotCall->getDotLoc(),
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memberAndFunctionRef.first,
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memberLoc, expr->isImplicit());
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return Action::Continue(ref);
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}
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}
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if (auto *dynamicMember = dyn_cast<DynamicMemberRefExpr>(expr)) {
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if (auto memberRef = dynamicMember->getMember()) {
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assert(!isa<ImplicitConversionExpr>(dynamicMember->getBase()));
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auto *ref = buildMemberRef(dynamicMember->getType(),
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dynamicMember->getBase(),
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dynamicMember->getDotLoc(),
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memberRef,
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dynamicMember->getNameLoc(),
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expr->isImplicit());
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return Action::Continue(ref);
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}
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}
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// A DotSyntaxBaseIgnoredExpr is a static member reference that has
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// already been type-checked down to a call where the argument doesn't
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// actually matter; turn it back into an overloaded member reference
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// expression.
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if (auto dotIgnored = dyn_cast<DotSyntaxBaseIgnoredExpr>(expr)) {
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DeclNameLoc memberLoc;
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auto memberAndFunctionRef = findReferencedDecl(dotIgnored->getRHS(),
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memberLoc);
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if (memberAndFunctionRef.first) {
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assert(!isa<ImplicitConversionExpr>(dotIgnored->getLHS()));
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auto *ref = buildMemberRef(dotIgnored->getType(),
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dotIgnored->getLHS(),
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dotIgnored->getDotLoc(),
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memberAndFunctionRef.first,
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memberLoc, expr->isImplicit());
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return Action::Continue(ref);
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}
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}
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return Action::Continue(expr);
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}
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/// Ignore declarations.
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PreWalkAction walkToDeclPre(Decl *decl) override {
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return Action::SkipChildren();
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}
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};
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} // end namespace
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static Type
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getTypeOfExpressionWithoutApplying(Expr *&expr, DeclContext *dc,
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ConcreteDeclRef &referencedDecl,
@@ -310,8 +115,6 @@ getTypeOfExpressionWithoutApplying(Expr *&expr, DeclContext *dc,
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}
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auto &Context = dc->getASTContext();
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expr = expr->walk(SanitizeExpr(Context));
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FrontendStatsTracer StatsTracer(Context.Stats,
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"typecheck-expr-no-apply", expr);
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PrettyStackTraceExpr stackTrace(Context, "type-checking", expr);
@@ -453,11 +256,6 @@ bool TypeChecker::typeCheckForCodeCompletion(
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return false;
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}
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if (getAsExpr(target.getAsASTNode())) {
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SanitizeExpr sanitizer(Context);
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target = *target.walk(sanitizer);
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}
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CompletionContextFinder contextAnalyzer(target, DC);
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// If there was no completion expr (e.g. if the code completion location was

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