[wasm] Support validation of asm.js modules with != 3 args.

test/mjsunit/asm/asm-validation.js

Index: test/mjsunit/asm/asm-validation.js
diff --git a/test/mjsunit/asm/asm-validation.js b/test/mjsunit/asm/asm-validation.js
new file mode 100644
index 0000000000000000000000000000000000000000..6846fb2a67eff7a9debe79fa7fcec2edd5c21de9
--- /dev/null
+++ b/test/mjsunit/asm/asm-validation.js
@@ -0,0 +1,73 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --validate-asm --allow-natives-syntax
+
+(function TestModuleArgs() {
+  function Module1(stdlib) {
+    "use asm";
+    function foo() { }
+    return { foo: foo };
+  }
+  function Module2(stdlib, ffi) {
+    "use asm";
+    function foo() { }
+    return { foo: foo };
+  }
+  function Module3(stdlib, ffi, heap) {
+    "use asm";
+    function foo() { }
+    return { foo: foo };
+  }
+  var modules = [Module1, Module2, Module3];
+  var heap = new ArrayBuffer(1024 * 1024);
+  for (var i = 0; i < modules.length; ++i) {
+    print('Module' + (i + 1));
+    var module = modules[i];
+    // TODO(bradnelson): Support modules without the stdlib.
+    var m = module({});
+    assertTrue(%IsAsmWasmCode(module));
+    var m = module({}, {});
+    assertTrue(%IsAsmWasmCode(module));
+    var m = module({}, {}, heap);
+    assertTrue(%IsAsmWasmCode(module));
+    var m = module({}, {}, heap, {});
+    assertTrue(%IsAsmWasmCode(module));
+  }
+})();
+
+(function TestBadModule() {
+  function Module(stdlib, ffi, heap) {
+    "use asm";
+    function foo() { var y = 3; var x = 1 + y; return 123; }
+    return { foo: foo };
+  }
+  var m = Module({});
+  assertFalse(%IsAsmWasmCode(Module));
+  assertEquals(123, m.foo());
+})();
+
+(function TestModuleNoStdlib() {
+  // TODO(bradnelson): Support modules like if they don't use the whole stdlib.
+  function Module() {
+    "use asm";
+    function foo() { return 123; }
+    return { foo: foo };
+  }
+  var m = Module({});
+  assertFalse(%IsAsmWasmCode(Module));
+  assertEquals(123, m.foo());
+})();
+
+(function TestModuleNoStdlibCall() {
+  function Module(stdlib, ffi, heap) {
+    "use asm";
+    function foo() { return 123; }
+    return { foo: foo };
+  }
+  // TODO(bradnelson): Support instantiation like this if stdlib is unused.
+  var m = Module();
+  assertFalse(%IsAsmWasmCode(Module));
+  assertEquals(123, m.foo());
+})();