[Type checker] Move accessor creation out of validateDecl().

lib/Sema/CSApply.cpp

@@ -17,6 +17,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "ConstraintSystem.h"
+#include "CodeSynthesis.h"
 #include "CSDiagnostics.h"
 #include "MiscDiagnostics.h"
 #include "TypeCheckProtocol.h"
@@ -4112,6 +4113,7 @@ namespace {
         method = func;
       } else if (auto var = dyn_cast<VarDecl>(foundDecl)) {
         // Properties.
+        maybeAddAccessorsToStorage(tc, var);
 
         // If this isn't a property on a type, complain.
         if (!var->getDeclContext()->isTypeContext()) {

lib/Sema/CodeSynthesis.cpp

@@ -1786,6 +1786,7 @@ static bool wouldBeCircularSynthesis(AbstractStorageDecl *storage,
 void swift::triggerAccessorSynthesis(TypeChecker &TC,
                                      AbstractStorageDecl *storage) {
   auto VD = dyn_cast<VarDecl>(storage);
+  maybeAddAccessorsToStorage(TC, storage);
 
   // Synthesize accessors for lazy, all checking already been performed.
   bool lazy = false;

lib/Sema/TypeCheckDecl.cpp

@@ -1496,7 +1496,7 @@ static void checkVarBehavior(VarDecl *decl, TypeChecker &TC) {
   // No behavior, no problems.
   if (!decl->hasBehavior())
     return;
-  
+
   // Don't try to check the behavior if we already encountered an error.
   if (decl->getType()->hasError())
     return;
@@ -2262,9 +2262,6 @@ static void validateAbstractStorageDecl(TypeChecker &TC,
   storage->setIsGetterMutating(computeIsGetterMutating(TC, storage));
   storage->setIsSetterMutating(computeIsSetterMutating(TC, storage));
 
-  // Add any mandatory accessors now.
-  maybeAddAccessorsToStorage(TC, storage);
-
   // Everything else about the accessors can wait until finalization.
   // This will validate all the accessors.
   TC.DeclsToFinalize.insert(storage);
@@ -2274,9 +2271,15 @@ static void finalizeAbstractStorageDecl(TypeChecker &TC,
                                         AbstractStorageDecl *storage) {
   TC.validateDecl(storage);
 
+  // Add any mandatory accessors now.
+  maybeAddAccessorsToStorage(TC, storage);
+
   for (auto accessor : storage->getAllAccessors()) {
     // Are there accessors we can safely ignore here, like maybe observers?
     TC.validateDecl(accessor);
+
+    // Finalize the accessors as well.
+    TC.DeclsToFinalize.insert(accessor);
   }
 }
 
@@ -2373,6 +2376,9 @@ class DeclChecker : public DeclVisitor<DeclChecker> {
   void visitBoundVariable(VarDecl *VD) {
     TC.validateDecl(VD);
 
+    // Set up accessors.
+    maybeAddAccessorsToStorage(TC, VD);
+
     // Check the behavior.
     checkVarBehavior(VD, TC);
 
@@ -4606,6 +4612,7 @@ void TypeChecker::requestMemberLayout(ValueDecl *member) {
     // because if they never get validated at all then conformance checkers
     // will complain about selector mismatches.
     if (storage->isObjC()) {
+      maybeAddAccessorsToStorage(*this, storage);
       for (auto accessor : storage->getAllAccessors()) {
         requestMemberLayout(accessor);
       }

lib/Sema/TypeCheckDeclOverride.cpp

@@ -861,6 +861,13 @@ bool OverrideMatcher::checkOverride(ValueDecl *baseDecl,
     if (!shouldDiagnose && baseDecl->isSettable(dc)){
       auto matchASD = cast<AbstractStorageDecl>(baseDecl);
       if (matchASD->isSetterAccessibleFrom(dc)) {
+        // Match sure we've created the setter.
+        if (!matchASD->getSetter()) {
+          maybeAddAccessorsToStorage(
+                           *static_cast<TypeChecker *>(ctx.getLazyResolver()),
+                           matchASD);
+        }
+
         auto matchSetterAccessScope = matchASD->getSetter()
           ->getFormalAccessScope(dc);
         auto requiredSetterAccessScope =
@@ -1753,8 +1760,14 @@ OverriddenDeclsRequest::evaluate(Evaluator &evaluator, ValueDecl *decl) const {
 
     // Check the various overridden storage declarations.
     SmallVector<OverrideMatch, 2> matches;
+    ASTContext &ctx = decl->getASTContext();
     for (auto overridden : overridingASD->getOverriddenDecls()) {
       auto baseASD = cast<AbstractStorageDecl>(overridden);
+      if (auto lazyResolver = ctx.getLazyResolver()) {
+        maybeAddAccessorsToStorage(*static_cast<TypeChecker *>(lazyResolver),
+                                   baseASD);
+      }
+
       auto kind = accessor->getAccessorKind();
 
       // If the base doesn't consider this an opaque accessor,

test/CircularReferences/objc.swift

@@ -10,3 +10,16 @@
 class A {
   @objc func foo() { }
 }
+
+
+@objc class B {
+  @objc dynamic subscript(i: Int) -> B {
+    return self
+  }
+}
+
+class C: B {
+  override subscript(i: Int) -> B {
+    return super[i]
+  }
+}