Basic interface inference for modules.

test/mjsunit/harmony/module-resolution.js

Index: test/mjsunit/harmony/module-resolution.js
diff --git a/test/mjsunit/harmony/module-resolution.js b/test/mjsunit/harmony/module-resolution.js
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+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --harmony-modules --harmony-scoping
+
+// Test basic module interface inference.
+
+"use strict";
+
+print("begin.")
+
+export let x = print("0")
+
+export module B = A.B
+
+export module A {
+  export let x = print("1")
+  export let f = function() { return B.x }
+  export module B {
+    module BB = B
+    export BB, x
+    let x = print("2")
+    let y = print("3")
+    let Ax = A.x
+    let ABx = A.B.x
+    let Ay = A.y
+    let BBx = BB.x
+    let Af = A.f
+    function f(x,y) { return x }
+  }
+  export let y = print("4")
+  let Ax = A.x
+  let Bx = B.x
+  let ABx = A.B.x
+  module C {
+    export let z = print("5")
+    export module D = B
+    // TODO(rossberg): turn these into proper negative test cases once we have
+    // suitable error messages.
+    // import C.z  // multiple declarations
+    import x from B
+  }
+  module D {
+    // TODO(rossberg): Handle import *.
+    // import A.*  // invalid forward import
+  }
+  module M {}
+  // TODO(rossberg): Handle import *.
+  // import M.*  // invalid forward import
+  let Cz = C.z
+  let CDx = C.D.x
+}
+
+export module Imports {
+  module A1 {
+    export module A2 {}
+  }
+  module B {
+    // TODO(rossberg): Handle import *.
+    // import A1.*
+    // import A2.*  // unbound variable A2
+  }
+}
+
+export module E {
+  export let xx = x
+  export y, B
+  let Bx = B.x
+  // TODO(rossberg): Handle import *.
+  // import A.*
+}
+
+export module M1 {
+  export module A2 = M2
+}
+export module M2 {
+  export module A1 = M1
+}
+
+// TODO(rossberg): turn these into proper negative test cases once we have
+// suitable error messages.
+// module W1 = W2.W
+// module W2 = { export module W = W3 }
+// module W3 = W1  // cyclic module definition
+
+// module W1 = W2.W3
+// module W2 = {
+//   export module W3 = W4
+//   export module W4 = W1
+// }  // cyclic module definition
+
+// TODO(rossberg): Handle import *.
+//module M3B = M3.B
+//export module M3 {
+//  export module B { export let x = "" }
+//  module C1 = { import M3.* }
+//  module C2 = { import M3.B.* }
+//  module C3 = { import M3B.* }
+//  module C4 = { export x import B.* }
+//// TODO(rossberg): turn these into proper negative test cases once we have
+//// suitable error messages.
+//// export module C5 = { import C5.* }  // invalid forward import
+//// export module C6 = { import M3.C6.* }  // invalid forward import
+//}
+
+export module External at "external.js"
+export module External1 = External
+export module ExternalA = External.A
+export module InnerExternal {
+  export module E at "external.js"
+}
+export module External2 = InnerExternal.E
+//export let xxx = InnerExternal.E.A.x
+
+print("end.")