[Utils] add test cases for swift-function-caller-generator

Author: hnrklssn

test/Utils/swift-function-caller-generator/basic.swift

@@ -0,0 +1,39 @@
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+// RUN: %swift-function-caller-generator Test %t/test.swift > %t/out.swift
+// RUN: %diff %t/out.swift %t/out.swift.expected
+
+//--- test.swift
+func foo(x: Int) -> Int
+
+func bar(_ y: UnsafePointer<CInt>)
+
+@_lifetime(borrow z)
+func baz(_ z: Span<CInt>) -> Span<CInt>
+
+@_lifetime(`func`: copy `func`)
+func qux(_ func: inout MutableSpan<CInt>)
+
+//--- out.swift.expected
+import Test
+
+func call_foo(x: Int) -> Int {
+  return foo(x: x)
+}
+
+
+func call_bar(_ y: UnsafePointer<CInt>) {
+  return unsafe bar(y)
+}
+
+
+@_lifetime(borrow z)
+func call_baz(_ z: Span<CInt>) -> Span<CInt> {
+  return baz(z)
+}
+
+
+@_lifetime(`func`: copy `func`)
+func call_qux(_ func: inout MutableSpan<CInt>) {
+  return qux(&`func`)
+}

test/Utils/swift-function-caller-generator/compile.swift

@@ -0,0 +1,23 @@
+// RUN: %empty-directory(%t)
+
+// RUN: %target-build-swift -emit-module %s -enable-experimental-feature Lifetimes -enable-experimental-feature LifetimeDependence -o %t/%target-library-name(Test) -module-name Test -emit-library
+
+// RUN: %target-swift-emit-module-interface(%t/Test.swiftinterface) %s -enable-experimental-feature Lifetimes -enable-experimental-feature LifetimeDependence
+// RUN: %swift-function-caller-generator Test %t/Test.swiftinterface > %t/out.swift
+
+// RUN: %target-swift-frontend -typecheck -verify %t/out.swift -I %t
+
+func foo(x: Int) -> Int {
+  return x
+}
+
+func bar(_ y: UnsafePointer<CInt>) {}
+
+@_lifetime(borrow z)
+func baz(_ z: Span<CInt>) -> Span<CInt> {
+  return z
+}
+
+@_lifetime(`func`: copy `func`)
+func qux(_ func: inout MutableSpan<CInt>) {}
+