Steal files from other branch

Author: hlopko

test/Interop/Cxx/extern-var/Inputs/global-var.cc

@@ -0,0 +1,13 @@
+int counter = 0;
+
+int count() {
+  return ++counter;
+}
+
+namespace Namespaced {
+  int counter = 0;
+
+  int count() {
+    return ++counter;
+  }
+}

test/Interop/Cxx/extern-var/Inputs/global-var.h

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+extern int counter;
+
+int count();
+
+namespace Namespaced {
+  extern int counter;
+
+  int count();
+}

test/Interop/Cxx/extern-var/global-var-irgen.swift

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+// Test that global variables are handled properly by the ClangImporter.
+
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift %s -I %S/Inputs -emit-ir -o %t/global-var.ir -Xfrontend -enable-cxx-interop
+// RUN: %FileCheck < %t/global-var.ir %s
+
+// CHECK: @counter = external global i32, align 4
+// CHECK: @_ZN10Namespaced7counterE = external global i32, align 4
+
+import GlobalVar
+
+func getCounter() -> CInt {
+  return counter
+}
+
+func getNamespacedCounter() -> CInt {
+  return Namespaced.counter
+}

test/Interop/Cxx/extern-var/global-var-silgen.swift

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+// Test that global variables are handled properly by the ClangImporter.
+
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift %s -I %S/Inputs -emit-sil -o %t/global-var.sil -Xfrontend -enable-cxx-interop
+// RUN: %FileCheck < %t/global-var.sil %s
+
+// CHECK: %0 = global_addr @counter : $*Int32
+// CHECK: %0 = global_addr @_ZN10Namespaced7counterE : $*Int32
+
+import GlobalVar
+
+func getCounter() -> CInt {
+  return counter
+}
+
+func getNamespacedCounter() -> CInt {
+  return Namespaced.counter
+}

test/Interop/Cxx/extern-var/global-var.swift

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+// Test that global variables are handled properly by the ClangImporter.
+
+// RUN: %empty-directory(%t)
+// RUN: %target-clang -c %S/Inputs/global-var.cc -I %S/Inputs -fPIC -o %t/global-var.o
+// RUN: %target-build-swift %s -I %S/Inputs -o %t/global-var %t/global-var.o -Xfrontend -enable-cxx-interop
+// RUN: %target-codesign %t/global-var
+// RUN: %target-run %t/global-var
+//
+// REQUIRES: executable_test
+
+import GlobalVar
+import StdlibUnittest
+
+var StaticsTestSuite = TestSuite("global-var")
+
+StaticsTestSuite.test("global-var") {
+  expectEqual(counter, 0)
+  expectEqual(count(), 1)
+  expectEqual(counter, 1)
+  counter = 42
+  expectEqual(counter, 42)
+  expectEqual(count(), 43)
+}
+
+StaticsTestSuite.test("namespaced-global-var") {
+  expectEqual(Namespaced.counter, 0)
+  expectEqual(Namespaced.count(), 1)
+  expectEqual(Namespaced.counter, 1)
+  Namespaced.counter = 42
+  expectEqual(Namespaced.counter, 42)
+  expectEqual(Namespaced.count(), 43)
+}
+
+runAllTests()