Testcase for the playground transform.

This is the first testcase and includes the test
harness which will work for other testcases as
well.

Also includes a fix to make sure that we only
instrument once per main source file, and not
once per parse as we were doing before.


Swift SVN r20456

lib/Frontend/Frontend.cpp

@@ -412,16 +412,15 @@ void CompilerInstance::performSema() {
       parseIntoSourceFile(MainFile, MainFile.getBufferID().getValue(), &Done,
                           TheSILModule ? &SILContext : nullptr,
                           &PersistentState, DelayedCB.get());
-      if (PrimaryBufferID == NO_SUCH_BUFFER ||
-          MainBufferID == PrimaryBufferID) {
+      if (PrimaryBufferID == NO_SUCH_BUFFER || MainBufferID == PrimaryBufferID) 
         performTypeChecking(MainFile, PersistentState.getTopLevelContext(),
                             CurTUElem);
-        if (Invocation.getFrontendOptions().Playground)
-          performPlaygroundTransform(MainFile);
-      }
       CurTUElem = MainFile.Decls.size();
     } while (!Done);
-
+    
+    if (Invocation.getFrontendOptions().Playground &&
+        (PrimaryBufferID == NO_SUCH_BUFFER || MainBufferID == PrimaryBufferID))
+      performPlaygroundTransform(MainFile);
   }
 
   // Type-check each top-level input besides the main source file.

test/PlaygroundTransform/Inputs/PlaygroundsRuntime.swift

@@ -0,0 +1,42 @@
+class LogRecord {
+  let text : String
+  init(api : String, object : Any, name : String) {
+    var object_description : String = ""
+    print(object, &object_description)
+    text = api + "[" + name + "='" + object_description + "']"
+  }
+  init(api : String, object: Any) {
+    var object_description : String = ""
+    print(object, &object_description)
+    text = api + "['" + object_description + "']"
+  }
+  init(api: String) {
+    text = api
+  }
+}
+
+func $builtin_log<T>(object : T, name : String) -> AnyObject? {
+  return LogRecord(api:"$builtin_log", object:object, name:name)
+}
+
+func $builtin_log_scope_entry() -> AnyObject? {
+  return LogRecord(api:"$builtin_log_scope_entry")
+}
+
+func $builtin_log_scope_exit() -> AnyObject? {
+  return LogRecord(api:"$builtin_log_scope_exit")
+}
+
+func $builtin_print<T>(object: T) -> AnyObject? {
+  return LogRecord(api:"$builtin_print", object:object)
+}
+
+func $builtin_println<T>(object: T) -> AnyObject? {
+  return LogRecord(api:"$builtin_println", object:object)
+}
+
+func $builtin_send_data(object:AnyObject?, sl: Int, el: Int, sc: Int, ec: Int) {
+  let loc : String = "[" + String(sl) + ":" + String(sc)
+                   + "-" + String(el) + ":" + String(ec) + "]"
+  println(loc + " " + (object as LogRecord).text)
+}

test/PlaygroundTransform/declarations.swift

@@ -0,0 +1,18 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: cp %s %t/main.swift
+// RUN: %target-build-swift -Xfrontend -playground -Xfrontend -debugger-support -o %t/main %S/Inputs/PlaygroundsRuntime.swift %t/main.swift
+// RUN: %target-run %t/main | FileCheck %s
+var a = 2
+var b = 3
+a + b 
+// CHECK: [{{.*}}] $builtin_log_scope_entry
+// CHECK-NEXT: [{{.*}}] $builtin_log[a='2']
+// CHECK-NEXT: [{{.*}}] $builtin_log_scope_exit
+// CHECK-NEXT: [{{.*}}] $builtin_log_scope_entry
+// CHECK-NEXT: [{{.*}}] $builtin_log[b='3']
+// CHECK-NEXT: [{{.*}}] $builtin_log_scope_exit
+// CHECK-NEXT: [{{.*}}] $builtin_log_scope_entry
+// CHECK-NEXT: [{{.*}}] $builtin_log[='5']
+// CHECK-NEXT: [{{.*}}] $builtin_log_scope_exit
+