Implement fast load and call of arguments in the presence of eval....

test/mjsunit/arguments-load-across-eval.js

+// Copyright 2010 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:
+//
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+//     * Redistributions in binary form must reproduce the above
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+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Tests loading of aguments across eval calls.
+
+// Test loading across an eval call that does not shadow variables.
+function testNoShadowing(x, h) {
+  function f() {
+    eval('1');
+    assertEquals(1, x);
+    assertEquals(2, h());
+    function g() {
+      assertEquals(1, x);
+      assertEquals(2, h());
+    }
+    g();
+  }
+  f();
+}
+
+testNoShadowing(1, function() { return 2; });
+
+// Test loading across eval calls that do not shadow variables.
+function testNoShadowing2(x, h) {
+  eval('1');
+  function f() {
+    eval('1');
+    assertEquals(1, x);
+    assertEquals(2, h());
+    function g() {
+      assertEquals(1, x);
+      assertEquals(2, h());
+    }
+    g();
+  }
+  f();
+}
+
+testNoShadowing2(1, function() { return 2; });
+
+// Test loading across an eval call that shadows variables.
+function testShadowing(x, h) {
+  function f() {
+    assertEquals(1, x);
+    assertEquals(2, h());
+    eval('var x = 3; var h = function() { return 4; };');
+    assertEquals(3, x);
+    assertEquals(4, h());
+    function g() {
+      assertEquals(3, x);
+      assertEquals(4, h());
+    }
+    g();
+  }
+  f();
+  assertEquals(1, x);
+  assertEquals(2, h());
+}
+
+testShadowing(1, function() { return 2; });
+
+