Merge pull request swiftlang#68862 from kubamracek/embedded-shared-linkage

[embedded] Allow serialization of SILLinkage::shared functions without promoting them to public

Author: kubamracek

lib/SIL/IR/SILFunctionBuilder.cpp

@@ -32,7 +32,7 @@ SILFunction *SILFunctionBuilder::getOrCreateFunction(
   if (auto fn = mod.lookUpFunction(name)) {
     assert(fn->getLoweredFunctionType() == type);
     assert(stripExternalFromLinkage(fn->getLinkage()) ==
-           stripExternalFromLinkage(linkage));
+           stripExternalFromLinkage(linkage) || mod.getOptions().EmbeddedSwift);
     return fn;
   }
 

test/embedded/shared-linkage.swift

@@ -0,0 +1,49 @@
+// RUN: %empty-directory(%t)
+// RUN: %{python} %utils/split_file.py -o %t %s
+
+// RUN: %target-swift-frontend -emit-module -o %t/Module.swiftmodule %t/Module.swift -enable-experimental-feature Embedded
+// RUN: %target-swift-frontend -emit-ir %t/Main.swift -I%t -enable-experimental-feature Embedded
+
+// RUN: %target-swift-frontend -O -emit-module -o %t/Module.swiftmodule %t/Module.swift -enable-experimental-feature Embedded
+// RUN: %target-swift-frontend -O -emit-ir %t/Main.swift -I%t -enable-experimental-feature Embedded
+
+// RUN: %target-swift-frontend -Osize -emit-module -o %t/Module.swiftmodule %t/Module.swift -enable-experimental-feature Embedded
+// RUN: %target-swift-frontend -Osize -emit-ir %t/Main.swift -I%t -enable-experimental-feature Embedded
+
+// REQUIRES: swift_in_compiler
+// REQUIRES: VENDOR=apple
+// REQUIRES: OS=macosx
+
+// BEGIN Module.swift
+
+public func bar<R>(count: Int, _ body: (UnsafeMutableBufferPointer<Int>) -> R) -> R {
+  let pointer = UnsafeMutablePointer<Int>(bitPattern: 42)!
+  let inoutBufferPointer = UnsafeMutableBufferPointer(start: pointer, count: count)
+  return body(inoutBufferPointer)
+}
+
+public func foo<R>(_ body: () -> R) -> R {
+  bar(count: 10) { p in
+    body()
+  }
+}
+
+public func module_func() {
+  foo {
+    return 0
+  }
+}
+
+// BEGIN Main.swift
+
+import Module
+
+public func test() {
+  module_func()
+}
+
+public func client_func() {
+  foo {
+    return 0
+  }
+}