[5.10][SILGen/DI] InitAccessors: Fix handling of nonmutating set when type has other stored properties

lib/SILGen/SILGenFunction.cpp

@@ -1820,8 +1820,8 @@ SILGenFunction::emitApplyOfSetterToBase(SILLocation loc, SILDeclRef setter,
     SmallVector<ManagedValue, 4> captures;
     emitCaptures(loc, setter, CaptureEmission::AssignByWrapper, captures);
 
-    for (auto capture : captures)
-      capturedArgs.push_back(capture.forward(*this));
+    llvm::transform(captures, std::back_inserter(capturedArgs),
+                    [](auto &capture) { return capture.getValue(); });
   } else {
     assert(base);
 
@@ -1839,16 +1839,20 @@ SILGenFunction::emitApplyOfSetterToBase(SILLocation loc, SILDeclRef setter,
       // nonmutating setter, for example.
       capturedBase = B.createTrivialLoadOr(loc, base.getValue(),
                                            LoadOwnershipQualifier::Copy);
+      // On-stack partial apply doesn't take ownership of the base, so
+      // we have to destroy it manually.
+      enterDestroyCleanup(capturedBase);
     } else {
-      capturedBase = base.copy(*this, loc).forward(*this);
+      capturedBase = base.borrow(*this, loc).getValue();
     }
 
     capturedArgs.push_back(capturedBase);
   }
 
   PartialApplyInst *setterPAI =
       B.createPartialApply(loc, setterFRef, substitutions, capturedArgs,
-                           ParameterConvention::Direct_Guaranteed);
+                           ParameterConvention::Direct_Guaranteed,
+                           PartialApplyInst::OnStackKind::OnStack);
   return emitManagedRValueWithCleanup(setterPAI).getValue();
 }
 

lib/SILOptimizer/Mandatory/DefiniteInitialization.cpp

@@ -662,14 +662,32 @@ bool LifetimeChecker::shouldEmitError(const SILInstruction *Inst) {
   // This is safe to ignore because assign_by_wrapper/assign_or_init will
   // only be re-written to use the setter if the value is fully initialized.
   if (auto *load = dyn_cast<SingleValueInstruction>(Inst)) {
-    if (auto Op = load->getSingleUse()) {
-      if (auto PAI = dyn_cast<PartialApplyInst>(Op->getUser())) {
-        if (std::find_if(PAI->use_begin(), PAI->use_end(), [](auto PAIUse) {
-              return isa<AssignByWrapperInst>(PAIUse->getUser()) ||
-                     isa<AssignOrInitInst>(PAIUse->getUser());
-            }) != PAI->use_end()) {
-          return false;
-        }
+    auto isOnlyUsedByPartialApply =
+        [&](const SingleValueInstruction *inst) -> PartialApplyInst * {
+      Operand *result = nullptr;
+      for (auto *op : inst->getUses()) {
+        auto *user = op->getUser();
+
+        // Ignore copies, destroys and borrows because they'd be
+        // erased together with the setter.
+        if (isa<DestroyValueInst>(user) || isa<CopyValueInst>(user) ||
+            isa<BeginBorrowInst>(user) || isa<EndBorrowInst>(user))
+          continue;
+
+        if (result)
+          return nullptr;
+
+        result = op;
+      }
+      return result ? dyn_cast<PartialApplyInst>(result->getUser()) : nullptr;
+    };
+
+    if (auto *PAI = isOnlyUsedByPartialApply(load)) {
+      if (std::find_if(PAI->use_begin(), PAI->use_end(), [](auto PAIUse) {
+            return isa<AssignByWrapperInst>(PAIUse->getUser()) ||
+                   isa<AssignOrInitInst>(PAIUse->getUser());
+          }) != PAI->use_end()) {
+        return false;
       }
     }
   }

test/Interpreter/init_accessors.swift

@@ -865,6 +865,7 @@ do {
 
   struct TestNonMutatingSetNoDefault {
     var _count: Int
+    var _other: String = ""
 
     var count: Int {
       @storageRestrictions(initializes: _count)
@@ -917,7 +918,7 @@ do {
 // CHECK-NEXT: test-nonmutating-set-2: TestNonMutatingSetDefault(_count: 0)
 // CHECK-NEXT: init accessor is called: -1
 // CHECK-NEXT: nonmutating set called: 0
-// CHECK-NEXT: test-nonmutating-set-3: TestNonMutatingSetNoDefault(_count: -1)
+// CHECK-NEXT: test-nonmutating-set-3: TestNonMutatingSetNoDefault(_count: -1, _other: "")
 // CHECK-NEXT: init accessor is called: 42
 // CHECK-NEXT: nonmutating set called: 0
 // CHECK-NEXT: test-nonmutating-set-4: TestNonMutatingSetCustom(_count: 42)

test/SILGen/objc_properties.swift

@@ -289,11 +289,11 @@ class SomeWrapperTests {
 
 // CHECK-LABEL: sil hidden [ossa] @$s15objc_properties16SomeWrapperTestsCyACSScfc : $@convention(method) (@owned String, @owned SomeWrapperTests) -> @owned SomeWrapperTests {
 // CHECK:  [[M:%.*]] = function_ref @$s15objc_properties16SomeWrapperTestsC04someD0SivsTD
-// CHECK:  [[C:%.*]] = partial_apply [callee_guaranteed] [[M]]({{.*}})
-// CHECK: assign_by_wrapper {{%.*}}: $Int to {{%.*}} : $*SomeWrapper, init {{.*}} : $@callee_guaranteed (Int) -> SomeWrapper, set [[C]] : $@callee_guaranteed (Int) -> ()
+// CHECK:  [[C:%.*]] = partial_apply [callee_guaranteed] [on_stack] [[M]]({{.*}})
+// CHECK: assign_by_wrapper {{%.*}}: $Int to {{%.*}} : $*SomeWrapper, init {{.*}} : $@callee_guaranteed (Int) -> SomeWrapper, set [[C]] : $@noescape @callee_guaranteed (Int) -> ()
 // CHECK: [[M:%.*]] = function_ref @$s15objc_properties16SomeWrapperTestsC1sSSSgvsTD
-// CHECK: [[C:%.*]] = partial_apply [callee_guaranteed] [[M]](
-// CHECK:  assign_by_wrapper {{.*}} : $Optional<String> to {{.*}} : $*W<Optional<String>>, init {{.*}} : $@callee_guaranteed (@owned Optional<String>) -> @owned W<Optional<String>>, set [[C]] : $@callee_guaranteed (@owned Optional<String>) -> ()
+// CHECK: [[C:%.*]] = partial_apply [callee_guaranteed] [on_stack] [[M]](
+// CHECK:  assign_by_wrapper {{.*}} : $Optional<String> to {{.*}} : $*W<Optional<String>>, init {{.*}} : $@callee_guaranteed (@owned Optional<String>) -> @owned W<Optional<String>>, set [[C]] : $@noescape @callee_guaranteed (@owned Optional<String>) -> ()
   init(_ s: String) {
     someWrapper = 1000
     self.s = s

test/SILGen/property_wrapper_local.swift

@@ -25,8 +25,8 @@ func testLocalWrapper() {
   // CHECK: [[S:%.*]] = function_ref @$s22property_wrapper_local16testLocalWrapperyyF5valueL_Sivs : $@convention(thin) (Int, @guaranteed { var Wrapper<Int> }) -> ()
   // CHECK-NEXT: [[C:%.*]] = copy_value [[W]] : ${ var Wrapper<Int> }
   // CHECK-NOT: mark_function_escape
-  // CHECK-NEXT: [[SPA:%.*]] = partial_apply [callee_guaranteed] [[S]]([[C]]) : $@convention(thin) (Int, @guaranteed { var Wrapper<Int> }) -> ()
-  // CHECK-NEXT: assign_by_wrapper {{%.*}} : $Int to [[P]] : $*Wrapper<Int>, init [[IPA]] : $@callee_guaranteed (Int) -> Wrapper<Int>, set [[SPA]] : $@callee_guaranteed (Int) -> ()
+  // CHECK-NEXT: [[SPA:%.*]] = partial_apply [callee_guaranteed] [on_stack] [[S]]([[C]]) : $@convention(thin) (Int, @guaranteed { var Wrapper<Int> }) -> ()
+  // CHECK-NEXT: assign_by_wrapper {{%.*}} : $Int to [[P]] : $*Wrapper<Int>, init [[IPA]] : $@callee_guaranteed (Int) -> Wrapper<Int>, set [[SPA]] : $@noescape @callee_guaranteed (Int) -> ()
 
   _ = value
   // CHECK: mark_function_escape [[P]] : $*Wrapper<Int>

test/SILGen/property_wrappers.swift

@@ -903,8 +903,8 @@ struct NonMutatingSetterWrapper<Value> {
 struct NonMutatingWrapperTestStruct {
     // CHECK-LABEL: sil hidden [ossa] @$s17property_wrappers28NonMutatingWrapperTestStructV3valACSi_tcfC : $@convention(method) (Int, @thin NonMutatingWrapperTestStruct.Type) -> NonMutatingWrapperTestStruct {
     // CHECK: %[[LOAD:[0-9]+]] = load [trivial] %[[SRC:[0-9]+]] : $*NonMutatingWrapperTestStruct
-    // CHECK-NEXT: %[[SET_PA:[0-9]+]] = partial_apply [callee_guaranteed] %[[PW_SETTER:[0-9]+]](%[[LOAD]]) : $@convention(method) (Int, NonMutatingWrapperTestStruct) -> ()
-    // CHECK-NEXT: assign_by_wrapper %[[SETVAL:[0-9]+]] : $Int to %[[ADDR:[0-9]+]] : $*NonMutatingSetterWrapper<Int>, init %[[INIT_PA:[0-9]+]] : $@callee_guaranteed (Int) -> NonMutatingSetterWrapper<Int>, set %[[SET_PA]] : $@callee_guaranteed (Int) -> ()
+    // CHECK-NEXT: %[[SET_PA:[0-9]+]] = partial_apply [callee_guaranteed] [on_stack] %[[PW_SETTER:[0-9]+]](%[[LOAD]]) : $@convention(method) (Int, NonMutatingWrapperTestStruct) -> ()
+    // CHECK-NEXT: assign_by_wrapper %[[SETVAL:[0-9]+]] : $Int to %[[ADDR:[0-9]+]] : $*NonMutatingSetterWrapper<Int>, init %[[INIT_PA:[0-9]+]] : $@callee_guaranteed (Int) -> NonMutatingSetterWrapper<Int>, set %[[SET_PA]] : $@noescape @callee_guaranteed (Int) -> ()
     @NonMutatingSetterWrapper var SomeProp: Int
     init(val: Int) {
         SomeProp = val

test/SILGen/resilient_assign_by_wrapper.swift

@@ -33,9 +33,9 @@ public class AddressOnlySetter {
 
     // CHECK: [[E2:%.*]] = alloc_stack $AddressOnlyEnum
     // CHECK-NEXT: inject_enum_addr [[E2]] : $*AddressOnlyEnum, #AddressOnlyEnum.some!enumelt
-    // CHECK: [[S:%.*]] = partial_apply [callee_guaranteed] {{%.*}}({{%.*}}) : $@convention(method) (@in AddressOnlyEnum, @guaranteed AddressOnlySetter) -> ()
+    // CHECK: [[S:%.*]] = partial_apply [callee_guaranteed] [on_stack] {{%.*}}({{%.*}}) : $@convention(method) (@in AddressOnlyEnum, @guaranteed AddressOnlySetter) -> ()
     // CHECK: assign_by_wrapper [[E2]] : $*AddressOnlyEnum
-    // CHECK-SAME: set [[S]] : $@callee_guaranteed (@in AddressOnlyEnum) -> ()
+    // CHECK-SAME: set [[S]] : $@noescape @callee_guaranteed (@in AddressOnlyEnum) -> ()
     self.value = .some
   }
 
@@ -60,7 +60,7 @@ extension SubstitutedSetter where T == Bool {
     // CHECK: [[B:%.*]] = alloc_stack $Bool
     // CHECK: assign_by_wrapper [[B]] : $*Bool to [[W]] : $*WrapGod<Bool>
     // CHECK-SAME: init {{%.*}} : $@callee_guaranteed (@in Bool) -> @out WrapGod<Bool>
-    // CHECK-SAME: set {{%.*}} : $@callee_guaranteed (@in Bool) -> ()
+    // CHECK-SAME: set {{%.*}} : $@noescape @callee_guaranteed (@in Bool) -> ()
     self.value = true
   }
 }
@@ -96,7 +96,7 @@ extension ObjectifiedSetter where T == SomeObject {
     // CHECK: [[STORAGE:%.*]] = struct_element_addr {{%.*}} : $*ObjectifiedSetter<SomeObject>, #ObjectifiedSetter._value
     // CHECK: assign_by_wrapper [[OBJ]] : $SomeObject to [[STORAGE]] : $*WrapGod<SomeObject>
     // CHECK-SAME: init {{%.*}} : $@callee_guaranteed (@owned SomeObject) -> @out WrapGod<SomeObject>
-    // CHECK-SAME: set {{%.*}} : $@callee_guaranteed (@owned SomeObject) -> ()
+    // CHECK-SAME: set {{%.*}} : $@noescape @callee_guaranteed (@owned SomeObject) -> ()
     self.value = SomeObject()
   }
 }