Stack trace API: poison stack frames below the first strict mode frame.

test/mjsunit/regress/regress-2564.js

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+
+var o = [ function f0() { throw new Error(); },
+          function f1() { o[0](); },
+          function f2() { o[1](); },
+          function f3() { o[2](); } ];
+
+Error.prepareStackTrace = function(error, frames) {
+  Error.prepareStackTrace = undefined;  // Prevent recursion.

[rossberg, 2013/03/28 10:04:33]

Not sure I understand why this is necessary here. Should the below throw?

[Yang, 2013/03/28 10:55:03]

No, but if it does, i.e. assertion failure, the error message looks more sane.

+  try {
+    assertEquals(5, frames.length);
+    // Don't check the last frame since that's the top-level code.
+    for (var i = 0; i < frames.length - 1; i++) {
+      assertEquals(o[i], frames[i].getFunction());
+      assertEquals(o, frames[i].getThis());
+      // Private fields are no longer accessible.
+      assertEquals(undefined, frames[i].receiver);
+      assertEquals(undefined, frames[i].fun);
+      assertEquals(undefined, frames[i].pos);
+    }
+    return "success";
+  } catch (e) {
+    return "fail";
+  }
+}
+
+try {
+  o[3]();
+} catch (e) {
+  assertEquals("success", e.stack);
+};
+
+
+var o = [ function f0() { throw new Error(); },

[rossberg, 2013/03/28 10:04:33]

Maybe add a third test where the throwing function itself is strict.

[Yang, 2013/03/28 10:55:03]

Done.

+          function f1() { o[0](); },
+          function f2() { "use strict"; o[1](); },
+          function f3() { o[2](); } ];
+
+Error.prepareStackTrace = function(error, frames) {
+  Error.prepareStackTrace = undefined;  // Prevent recursion.
+  try {
+    assertEquals(5, frames.length);
+    for (var i = 0; i < 2; i++) {
+      // The first two frames are still classic mode.
+      assertEquals(o[i], frames[i].getFunction());
+      assertEquals(o, frames[i].getThis());
+    }
+    for (var i = 2; i < frames.length; i++) {
+      // The rest are poisoned by the first strict mode function.
+      assertEquals(undefined, frames[i].getFunction());
+      assertEquals(undefined, frames[i].getThis());
+    }
+    for (var i = 0; i < frames.length - 1; i++) {
+      // Function name remains accessible.
+      assertEquals("f"+i, frames[i].getFunctionName());
+    }
+    return "success";
+  } catch (e) {
+    return e;
+  }
+}
+
+try {
+  o[3]();
+} catch (e) {
+  assertEquals("success", e.stack);
+};