[SILGen] Fix a crash when a closure is converted to a block returning a value indirectly (#73520)

Author: ahatanaka

lib/IRGen/IRGenSIL.cpp

@@ -2338,7 +2338,9 @@ static void emitEntryPointArgumentsCOrObjC(IRGenSILFunction &IGF,
   // First, claim all the indirect results.
   ArrayRef<SILArgument *> args = emitEntryPointIndirectReturn(
       *emission, IGF, entry, funcTy, [&](SILType directResultType) -> bool {
-        return FI.getReturnInfo().isIndirect();
+        // Indirect at the IR level but direct at the SIL level.
+        return FI.getReturnInfo().isIndirect() &&
+               !funcTy->hasIndirectFormalResults();
       });
 
   unsigned nextArgTyIdx = 0;

lib/SILGen/SILGenBridging.cpp

@@ -392,7 +392,8 @@ static void buildFuncToBlockInvokeBody(SILGenFunction &SGF,
   if (blockTy->getNumResults() != 0) {
     auto result = blockTy->getSingleResult();
     if (result.getConvention() == ResultConvention::Indirect) {
-      indirectResult = entry->createFunctionArgument(blockResultTy);
+      indirectResult =
+          entry->createFunctionArgument(blockResultTy.getAddressType());
     }
   }
 

test/Interop/Cxx/class/Inputs/closure.h

@@ -20,4 +20,6 @@ struct ARCStrong {
 void cfuncARCStrong(void (*_Nonnull)(ARCStrong));
 #endif
 
+void cfuncReturnNonTrivial(NonTrivial (^_Nonnull)()) noexcept;
+
 #endif // __CLOSURE__

test/Interop/Cxx/class/closure-thunk-macosx-irgen.swift

@@ -0,0 +1,24 @@
+// RUN: %target-swiftxx-frontend -I %S/Inputs -emit-irgen %s | %FileCheck %s
+
+// REQUIRES: OS=macosx
+
+import Closure
+
+// CHECK: define internal swiftcc void @"$s4main34testClosureToBlockReturnNonTrivialyyFSo0gH0VycfU_"(ptr noalias sret(%{{.*}}) %[[V0:.*]])
+// CHECK: call {{void|ptr}} @__swift_cxx_ctor_ZN10NonTrivialC1Ev(ptr %[[V0]])
+// CHECK: ret void
+
+// CHECK: define linkonce_odr hidden void @"$sSo10NonTrivialVIegr_ABIeyBr_TR"(ptr noalias sret(%{{.*}}) %[[V0:.*]], ptr %[[V1:.*]])
+// CHECK: %[[V2:.*]] = getelementptr inbounds { %{{.*}}, %{{.*}} }, ptr %[[V1]], i32 0, i32 1
+// CHECK: %[[_FN:.*]] = getelementptr inbounds %{{.*}}, ptr %[[V2]], i32 0, i32 0
+// CHECK: %[[V3:.*]] = load ptr, ptr %[[_FN]], align 8
+// CHECK: %[[_DATA:.*]] = getelementptr inbounds %{{.*}}, ptr %[[V2]], i32 0, i32 1
+// CHECK: %[[V4:.*]] = load ptr, ptr %[[_DATA]], align 8
+// CHECK: call ptr @swift_retain(ptr returned %[[V4]])
+// CHECK: call swiftcc void %[[V3]](ptr noalias sret(%{{.*}}) %[[V0]], ptr swiftself %[[V4]])
+// CHECK: call void @swift_release(ptr %[[V4]])
+// CHECK: ret void
+
+public func testClosureToBlockReturnNonTrivial() {
+  cfuncReturnNonTrivial({() -> NonTrivial in return NonTrivial() })
+}

test/Interop/Cxx/class/closure-thunk-macosx.swift

@@ -20,3 +20,18 @@ import Closure
 public func testClosureToFuncPtr() {
  cfuncARCStrong({N in})
 }
+
+// CHECK: sil shared [transparent] [serialized] [reabstraction_thunk] [ossa] @$sSo10NonTrivialVIegr_ABIeyBr_TR : $@convention(c) (@inout_aliasable @block_storage @callee_guaranteed () -> @out NonTrivial) -> @out NonTrivial {
+// CHECK: bb0(%[[V0:.*]] : $*NonTrivial, %[[V1:.*]] : $*@block_storage @callee_guaranteed () -> @out NonTrivial):
+// CHECK: %[[V2:.*]] = project_block_storage %[[V1]] : $*@block_storage @callee_guaranteed () -> @out NonTrivial
+// CHECK: %[[V3:.*]] = load [copy] %[[V2]] : $*@callee_guaranteed () -> @out NonTrivial
+// CHECK: %[[V4:.*]] = begin_borrow %[[V3]] : $@callee_guaranteed () -> @out NonTrivial
+// CHECK: apply %[[V4]](%[[V0]]) : $@callee_guaranteed () -> @out NonTrivial
+// CHECK: end_borrow %[[V4]] : $@callee_guaranteed () -> @out NonTrivial
+// CHECK: %[[V8:.*]] = tuple ()
+// CHECK: destroy_value %[[V3]] : $@callee_guaranteed () -> @out NonTrivial
+// CHECK: return %[[V8]] : $()
+
+public func testClosureToBlockReturnNonTrivial() {
+  cfuncReturnNonTrivial({() -> NonTrivial in return NonTrivial() })
+}