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apple · Aug 13, 2020 · 0803e98 · 0803e98
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commit 0803e98
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Showing 2 changed files with 30 additions and 6 deletions.
diff --git a/Reference/unittest_swift_oneof_all_required.pb.swift b/Reference/unittest_swift_oneof_all_required.pb.swift
@@ -140,10 +140,22 @@ struct ProtobufUnittest_OneOfContainer {
     case option4(Int32)
 
     fileprivate var isInitialized: Bool {
+      // The use of inline closures is to circumvent an issue where the compiler
+      // allocates stack space for every case branch when no optimizations are
+      // enabled. https://github.com/apple/swift-protobuf/issues/1034
       switch self {
-      case .option1(let v): return v.isInitialized
-      case .option2(let v): return v.isInitialized
-      case .option3(let v): return v.isInitialized
+      case .option1: return {
+        guard case .option1(let v) = self else { preconditionFailure() }
+        return v.isInitialized
+      }()
+      case .option2: return {
+        guard case .option2(let v) = self else { preconditionFailure() }
+        return v.isInitialized
+      }()
+      case .option3: return {
+        guard case .option3(let v) = self else { preconditionFailure() }
+        return v.isInitialized
+      }()
       default: return true
       }
     }

diff --git a/Tests/SwiftProtobufTests/unittest_swift_oneof_all_required.pb.swift b/Tests/SwiftProtobufTests/unittest_swift_oneof_all_required.pb.swift
@@ -140,10 +140,22 @@ struct ProtobufUnittest_OneOfContainer {
     case option4(Int32)
 
     fileprivate var isInitialized: Bool {
+      // The use of inline closures is to circumvent an issue where the compiler
+      // allocates stack space for every case branch when no optimizations are
+      // enabled. https://github.com/apple/swift-protobuf/issues/1034
       switch self {
-      case .option1(let v): return v.isInitialized
-      case .option2(let v): return v.isInitialized
-      case .option3(let v): return v.isInitialized
+      case .option1: return {
+        guard case .option1(let v) = self else { preconditionFailure() }
+        return v.isInitialized
+      }()
+      case .option2: return {
+        guard case .option2(let v) = self else { preconditionFailure() }
+        return v.isInitialized
+      }()
+      case .option3: return {
+        guard case .option3(let v) = self else { preconditionFailure() }
+        return v.isInitialized
+      }()
       default: return true
       }
     }